organize and cleanup a ton of win32 imports, do cleanup elsewhere with that

src/BizHawk.Bizware.Input/KeyInput/RawKeyInput.cs

@@ -9,7 +9,7 @@ using BizHawk.Common;
 using BizHawk.Common.CollectionExtensions;
 
 using static BizHawk.Common.RawInputImports;
-using static BizHawk.Common.Win32Imports;
+using static BizHawk.Common.WmImports;
 
 using RawKey = Vortice.DirectInput.Key;
 
@@ -35,7 +35,7 @@ namespace BizHawk.Bizware.Input
 		{
 			var wc = default(WNDCLASS);
 			wc.lpfnWndProc = _wndProc;
-			wc.hInstance = GetModuleHandle(null);
+			wc.hInstance = Win32Imports.GetModuleHandle(null);
 			wc.lpszClassName = "RawKeyInputClass";
 
 			var atom = RegisterClass(ref wc);
@@ -125,7 +125,7 @@ namespace BizHawk.Bizware.Input
 					nHeight: 1,
 					hWndParent: HWND_MESSAGE,
 					hMenu: IntPtr.Zero,
-					hInstance: GetModuleHandle(null),
+					hInstance: Win32Imports.GetModuleHandle(null),
 					lpParam: IntPtr.Zero);
 
 			if (window == IntPtr.Zero)

src/BizHawk.Bizware.Input/SDL2/SDL2InputAdapter.cs

@@ -46,10 +46,10 @@ namespace BizHawk.Bizware.Input
 				// similar code shouldn't be needed on other platforms (which have global message queues and not thread local message queues)
 				if (!OSTailoredCode.IsUnixHost)
 				{
-					while (Win32Imports.PeekMessage(out var msg, IntPtr.Zero, 0, 0, Win32Imports.PM_REMOVE))
+					while (WmImports.PeekMessage(out var msg, IntPtr.Zero, 0, 0, WmImports.PM_REMOVE))
 					{
-						Win32Imports.TranslateMessage(ref msg);
+						WmImports.TranslateMessage(ref msg);
-						Win32Imports.DispatchMessage(ref msg);
+						WmImports.DispatchMessage(ref msg);
 					}
 				}
 

src/BizHawk.Client.EmuHawk/AVOut/AviWriter.cs

@@ -12,6 +12,8 @@ using BizHawk.Common;
 using BizHawk.Common.PathExtensions;
 using BizHawk.Emulation.Common;
 
+using static BizHawk.Common.HeapApiImports;
+
 // some helpful p/invoke from http://www.codeproject.com/KB/audio-video/Motion_Detection.aspx?msg=1142967
 namespace BizHawk.Client.EmuHawk
 {
@@ -19,7 +21,7 @@ namespace BizHawk.Client.EmuHawk
 		"Uses the Microsoft AVIFIL32 system to write .avi files.  Audio is uncompressed; Video can be compressed with any installed VCM codec.  Splits on 2G and resolution change.")]
 	internal class AviWriter : IVideoWriter
 	{
-		private CodecToken _currVideoCodecToken = null;
+		private CodecToken _currVideoCodecToken;
 		private AviWriterSegment _currSegment;
 
 		private readonly IDialogParent _dialogParent;
@@ -35,9 +37,7 @@ namespace BizHawk.Client.EmuHawk
 		private bool IsOpen => _nameProvider != null;
 
 		public void Dispose()
-		{
+			=> _currSegment?.Dispose();
-			_currSegment?.Dispose();
-		}
 
 		/// <summary>sets the codec token to be used for video compression</summary>
 		/// <exception cref="ArgumentException"><paramref name="token"/> does not inherit <see cref="CodecToken"/></exception>
@@ -57,12 +57,16 @@ namespace BizHawk.Client.EmuHawk
 		{
 			var (dir, baseName, ext) = template.SplitPathToDirFileAndExt();
 			yield return template;
-			int counter = 1;
+			var counter = 1;
-			for (;;)
+			while (counter < int.MaxValue)
 			{
 				yield return Path.Combine(dir, $"{baseName}_{counter}{ext}");
 				counter++;
 			}
+
+			yield return Path.Combine(dir, $"{baseName}_{counter}{ext}");
+
+			throw new InvalidOperationException("Reached maximum names");
 		}
 
 		/// <summary>
@@ -70,9 +74,7 @@ namespace BizHawk.Client.EmuHawk
 		/// set a video codec token first.
 		/// </summary>
 		public void OpenFile(string baseName)
-		{
+			=> OpenFile(CreateBasicNameProvider(baseName));
-			OpenFile(CreateBasicNameProvider(baseName));
-		}
 
 		// thread communication
 		// synchronized queue with custom messages
@@ -86,19 +88,18 @@ namespace BizHawk.Client.EmuHawk
 			{
 				while (true)
 				{
-					object o = _threadQ.Take();
+					var o = _threadQ.Take();
-					if (o is IVideoProvider provider)
+					switch (o)
 					{
-						AddFrameEx(provider);
+						case IVideoProvider provider:
-					}
+							AddFrameEx(provider);
-					else if (o is short[] arr)
+							break;
-					{
+						case short[] arr:
-						AddSamplesEx(arr);
+							AddSamplesEx(arr);
-					}
+							break;
-					else
+						default:
-					{
+							// anything else is assumed to be quit time
-						// anything else is assumed to be quit time
+							return;
-						return;
 					}
 				}
 			}
@@ -121,6 +122,7 @@ namespace BizHawk.Client.EmuHawk
 			public int BackgroundColor { get; }
 			public int VsyncNumerator { get; }
 			public int VsyncDenominator { get; }
+
 			public VideoCopy(IVideoProvider c)
 			{
 				_vb = (int[])c.GetVideoBuffer().Clone();
@@ -134,9 +136,7 @@ namespace BizHawk.Client.EmuHawk
 			}
 
 			public int[] GetVideoBuffer()
-			{
+				=> _vb;
-				return _vb;
-			}
 		}
 
 		/// <summary>opens an avi file for recording, with <paramref name="nameProvider"/> being used to name files</summary>
@@ -149,14 +149,14 @@ namespace BizHawk.Client.EmuHawk
 				throw new InvalidOperationException("Tried to start recording an AVI with no video codec token set");
 			}
 
-			_threadQ = new System.Collections.Concurrent.BlockingCollection<object>(30);
+			_threadQ = new(30);
-			_workerT = new System.Threading.Thread(new System.Threading.ThreadStart(ThreadProc));
+			_workerT = new(ThreadProc) { IsBackground = true };
 			_workerT.Start();
 		}
 
 		public void CloseFile()
 		{
-			_threadQ.Add(new object()); // acts as stop message
+			_threadQ.Add(new()); // acts as stop message
 			_workerT.Join();
 			_currSegment?.Dispose();
 			_currSegment = null;
@@ -169,7 +169,7 @@ namespace BizHawk.Client.EmuHawk
 			{
 				if (!_workerT.IsAlive)
 				{
-					throw new Exception("AVI Worker thread died!");
+					throw new("AVI Worker thread died!");
 				}
 			}
 		}
@@ -183,7 +183,7 @@ namespace BizHawk.Client.EmuHawk
 				Segment();
 			}
 
-			_currSegment.AddFrame(source);
+			_currSegment!.AddFrame(source);
 		}
 
 		/// <exception cref="Exception">worker thrread died</exception>
@@ -195,7 +195,7 @@ namespace BizHawk.Client.EmuHawk
 			{
 				if (!_workerT.IsAlive)
 				{
-					throw new Exception("AVI Worker thread died!");
+					throw new("AVI Worker thread died!");
 				}
 			}
 		}
@@ -208,7 +208,7 @@ namespace BizHawk.Client.EmuHawk
 				Segment();
 			}
 
-			_currSegment.AddSamples(samples);
+			_currSegment!.AddSamples(samples);
 		}
 
 		private void ConsiderLengthSegment()
@@ -218,7 +218,7 @@ namespace BizHawk.Client.EmuHawk
 				return;
 			}
 
-			long len = _currSegment.GetLengthApproximation();
+			var len = _currSegment.GetLengthApproximation();
 			const long segment_length_limit = 2 * 1000 * 1000 * 1000; // 2GB
 
 			// const long segment_length_limit = 10 * 1000 * 1000; //for testing
@@ -228,11 +228,6 @@ namespace BizHawk.Client.EmuHawk
 			}
 		}
 
-		private void StartRecording()
-		{
-			// i guess theres nothing to do here
-		}
-
 		private void Segment()
 		{
 			if (!IsOpen)
@@ -240,18 +235,12 @@ namespace BizHawk.Client.EmuHawk
 				return;
 			}
 
-			if (_currSegment == null)
+			_currSegment?.Dispose();
-			{
+			_currSegment = new();
-				StartRecording();
-			}
-			else
-			{
-				_currSegment.Dispose();
-			}
 
-			_currSegment = new AviWriterSegment();
 			_nameProvider.MoveNext();
 			_currSegment.OpenFile(_nameProvider.Current, _parameters, _currVideoCodecToken);
+
 			try
 			{
 				_currSegment.OpenStreams();
@@ -278,17 +267,25 @@ namespace BizHawk.Client.EmuHawk
 				a_samplerate = 44100,
 				a_channels = 2
 			};
-			var temp = new AviWriterSegment();
+
-			string tempfile = Path.GetTempFileName();
+			var tempSegment = new AviWriterSegment();
-			File.Delete(tempfile);
+			var tempFile = Path.GetTempFileName();
-			tempfile = Path.ChangeExtension(tempfile, "avi");
+			File.Delete(tempFile);
-			temp.OpenFile(tempfile, tempParams, null);
+			tempFile = Path.ChangeExtension(tempFile, "avi");
-			var ret = temp.AcquireVideoCodecToken(_dialogParent.AsWinFormsHandle().Handle, _currVideoCodecToken);
+			tempSegment.OpenFile(tempFile, tempParams, null);
-			CodecToken token = (CodecToken)ret;
+
-			config.AviCodecToken = token?.Serialize();
+			try
-			temp.CloseFile();
+			{
-			File.Delete(tempfile);
+				var ret = tempSegment.AcquireVideoCodecToken(_dialogParent.AsWinFormsHandle().Handle, _currVideoCodecToken);
-			return token;
+				var token = (CodecToken)ret;
+				config.AviCodecToken = token?.Serialize();
+				return token;
+			}
+			finally
+			{
+				tempSegment.CloseFile();
+				File.Delete(tempFile);
+			}
 		}
 
 		private class Parameters
@@ -329,11 +326,18 @@ namespace BizHawk.Client.EmuHawk
 			public void PopulateWAVEFORMATEX(ref AVIWriterImports.WAVEFORMATEX wfex)
 			{
 				const int WAVE_FORMAT_PCM = 1;
-				int bytes = 0;
+				var bytes = a_bits switch
-				if (a_bits == 16) bytes = 2;
+				{
-				else if (a_bits == 8) bytes = 1;
+					16 => 2,
-				else throw new InvalidOperationException($"only 8/16 bits audio are supported by {nameof(AviWriter)} and you chose: {a_bits}");
+					8 => 1,
-				if (a_channels is not (1 or 2)) throw new InvalidOperationException($"only 1/2 channels audio are supported by {nameof(AviWriter)} and you chose: {a_channels}");
+					_ => throw new InvalidOperationException($"only 8/16 bits audio are supported by {nameof(AviWriter)} and you chose: {a_bits}")
+				};
+
+				if (a_channels is not (1 or 2))
+				{
+					throw new InvalidOperationException($"only 1/2 channels audio are supported by {nameof(AviWriter)} and you chose: {a_channels}");
+				}
+
 				wfex.Init();
 				wfex.nBlockAlign = (ushort)(bytes * a_channels);
 				wfex.nChannels = (ushort)a_channels;
@@ -373,12 +377,10 @@ namespace BizHawk.Client.EmuHawk
 		/// </summary>
 		public void SetVideoParameters(int width, int height)
 		{
-			bool change = false;
+			var change = _parameters.width != width ||
+				_parameters.height != height;
 
-			change |= _parameters.width != width;
 			_parameters.width = width;
-
-			change |= _parameters.height != height;
 			_parameters.height = height;
 
 			if (change)
@@ -392,18 +394,14 @@ namespace BizHawk.Client.EmuHawk
 		/// </summary>
 		public void SetAudioParameters(int sampleRate, int channels, int bits)
 		{
-			bool change = false;
+			var change = _parameters.a_samplerate != sampleRate ||
+				_parameters.a_channels != channels ||
+				_parameters.a_bits != bits ||
+				_parameters.has_audio != true;
 
-			change |= _parameters.a_samplerate != sampleRate;
 			_parameters.a_samplerate = sampleRate;
-
-			change |= _parameters.a_channels != channels;
 			_parameters.a_channels = channels;
-
-			change |= _parameters.a_bits != bits;
 			_parameters.a_bits = bits;
-
-			change |= _parameters.has_audio != true;
 			_parameters.has_audio = true;
 
 			if (change)
@@ -414,24 +412,31 @@ namespace BizHawk.Client.EmuHawk
 
 		public class CodecToken : IDisposable
 		{
-			public void Dispose() { }
+			public void Dispose()
-			private CodecToken() { }
+			{
+			}
+
+			private CodecToken()
+			{
+			}
+
 			private AVIWriterImports.AVICOMPRESSOPTIONS _comprOptions;
 			public string codec;
 			public byte[] Format = Array.Empty<byte>();
 			public byte[] Parms = Array.Empty<byte>();
 
-			private static string Decode_mmioFOURCC(int code)
+			private static unsafe string Decode_mmioFOURCC(int code)
 			{
-				char[] chs = new char[4];
+				var chs = stackalloc char[4];
 
-				for (int i = 0; i < 4; i++)
+				for (var i = 0; i < 4; i++)
 				{
 					chs[i] = (char)(byte)((code >> (i << 3)) & 0xFF);
 					if (!char.IsLetterOrDigit(chs[i]))
 						chs[i] = ' ';
 				}
-				return new string(chs);
+
+				return new(chs, 0, 4);
 			}
 
 			public static CodecToken CreateFromAVICOMPRESSOPTIONS(ref AVIWriterImports.AVICOMPRESSOPTIONS opts)
@@ -461,27 +466,36 @@ namespace BizHawk.Client.EmuHawk
 			{
 #endif
 #if false // test: increase stability by never freeing anything, ever
-				if (opts.lpParms != IntPtr.Zero) Win32Imports.HeapFree(Win32Imports.GetProcessHeap(), 0, opts.lpParms);
+				if (opts.lpParms != IntPtr.Zero)
-				if (opts.lpFormat != IntPtr.Zero) Win32Imports.HeapFree(Win32Imports.GetProcessHeap(), 0, opts.lpFormat);
+				{
+					HeapFree(GetProcessHeap(), 0, opts.lpParms);
+				}
+
+				if (opts.lpFormat != IntPtr.Zero)
+				{
+					HeapFree(GetProcessHeap(), 0, opts.lpFormat);
+				}
 #endif
 #if AVI_SUPPORT
 				opts.lpParms = IntPtr.Zero;
 				opts.lpFormat = IntPtr.Zero;
 			}
 
-			public void AllocateToAVICOMPRESSOPTIONS(ref AVIWriterImports.AVICOMPRESSOPTIONS opts)
+			public void AllocateToAVICOMPRESSOPTIONS(out AVIWriterImports.AVICOMPRESSOPTIONS opts)
 			{
+				if (_comprOptions.cbParms != 0)
+				{
+					_comprOptions.lpParms = HeapAlloc(GetProcessHeap(), 0, _comprOptions.cbParms);
+					Marshal.Copy(Parms, 0, _comprOptions.lpParms, _comprOptions.cbParms);
+				}
+
+				if (_comprOptions.cbFormat != 0)
+				{
+					_comprOptions.lpFormat = HeapAlloc(GetProcessHeap(), 0, _comprOptions.cbFormat);
+					Marshal.Copy(Format, 0, _comprOptions.lpFormat, _comprOptions.cbFormat);
+				}
+
 				opts = _comprOptions;
-				if (opts.cbParms != 0)
-				{
-					opts.lpParms = Win32Imports.HeapAlloc(Win32Imports.GetProcessHeap(), 0, opts.cbParms);
-					Marshal.Copy(Parms, 0, opts.lpParms, opts.cbParms);
-				}
-				if (opts.cbFormat != 0)
-				{
-					opts.lpFormat = Win32Imports.HeapAlloc(Win32Imports.GetProcessHeap(), 0, opts.cbFormat);
-					Marshal.Copy(Format, 0, opts.lpFormat, opts.cbFormat);
-				}
 			}
 		
 			private byte[] SerializeToByteArray()
@@ -511,7 +525,7 @@ namespace BizHawk.Client.EmuHawk
 				var m = new MemoryStream(data, false);
 				var b = new BinaryReader(m);
 
-				AVIWriterImports.AVICOMPRESSOPTIONS comprOptions = new AVIWriterImports.AVICOMPRESSOPTIONS();
+				var comprOptions = default(AVIWriterImports.AVICOMPRESSOPTIONS);
 
 				byte[] format;
 				byte[] parms;
@@ -544,25 +558,20 @@ namespace BizHawk.Client.EmuHawk
 					b.Close();
 				}
 
-				var ret = new CodecToken
+				return new()
 				{
 					_comprOptions = comprOptions,
 					Format = format,
 					Parms = parms,
 					codec = Decode_mmioFOURCC(comprOptions.fccHandler)
 				};
-				return ret;
 			}
 
 			public string Serialize()
-			{
+				=> Convert.ToBase64String(SerializeToByteArray());
-				return Convert.ToBase64String(SerializeToByteArray());
-			}
 
 			public static CodecToken DeSerialize(string s)
-			{
+				=> DeSerializeFromByteArray(Convert.FromBase64String(s));
-				return DeSerializeFromByteArray(Convert.FromBase64String(s));
-			}
 		}
 
 		/// <summary>
@@ -573,21 +582,15 @@ namespace BizHawk.Client.EmuHawk
 		{
 		}
 
-		private unsafe class AviWriterSegment : IDisposable
+		private class AviWriterSegment : IDisposable
 		{
 			static AviWriterSegment()
 			{
 				AVIWriterImports.AVIFileInit();
 			}
 
-			public AviWriterSegment()
-			{
-			}
-
 			public void Dispose()
-			{
+				=> CloseFile();
-				CloseFile();
-			}
 
 			private CodecToken _currVideoCodecToken;
 			private bool _isOpen;
@@ -631,19 +634,15 @@ namespace BizHawk.Client.EmuHawk
 			private OutputStatus _outStatus;
 
 			public long GetLengthApproximation()
-			{
+				=> _outStatus.video_bytes + _outStatus.audio_bytes;
-				return _outStatus.video_bytes + _outStatus.audio_bytes;
-			}
 
-			private static bool FAILED(int hr) => hr < 0;
+			private static unsafe int AVISaveOptions(IntPtr stream, ref AVIWriterImports.AVICOMPRESSOPTIONS opts, IntPtr owner)
-
-			private static int AVISaveOptions(IntPtr stream, ref AVIWriterImports.AVICOMPRESSOPTIONS opts, IntPtr owner)
 			{
 				fixed (AVIWriterImports.AVICOMPRESSOPTIONS* _popts = &opts)
 				{
-					IntPtr* pStream = &stream;
+					var pStream = &stream;
-					AVIWriterImports.AVICOMPRESSOPTIONS* popts = _popts;
+					var popts = _popts;
-					AVIWriterImports.AVICOMPRESSOPTIONS** ppopts = &popts;
+					var ppopts = &popts;
 					return AVIWriterImports.AVISaveOptions(owner, 0, 1, pStream, ppopts);
 				}
 			}
@@ -654,10 +653,10 @@ namespace BizHawk.Client.EmuHawk
 			public void OpenFile(string destPath, Parameters parameters, CodecToken videoCodecToken)
 			{
 				static int mmioFOURCC(string str) => (
-					(byte)(str[0])
+					(byte)str[0] |
-					| ((byte)(str[1]) << 8)
+					((byte)str[1] << 8) |
-					| ((byte)(str[2]) << 16)
+					((byte)str[2] << 16) |
-					| ((byte)(str[3]) << 24)
+					((byte)str[3] << 24)
 				);
 
 				this._parameters = parameters;
@@ -671,28 +670,34 @@ namespace BizHawk.Client.EmuHawk
 					File.Delete(destPath);
 				}
 
-				if (FAILED(AVIWriterImports.AVIFileOpenW(ref _pAviFile, destPath, AVIWriterImports.OpenFileStyle.OF_CREATE | AVIWriterImports.OpenFileStyle.OF_WRITE, 0)))
+				var hr = AVIWriterImports.AVIFileOpenW(ref _pAviFile, destPath,
+					AVIWriterImports.OpenFileStyle.OF_CREATE | AVIWriterImports.OpenFileStyle.OF_WRITE, 0);
+				var hrEx = Marshal.GetExceptionForHR(hr);
+				if (hrEx != null)
 				{
-					throw new InvalidOperationException($"Couldnt open dest path for avi file: {destPath}");
+					throw new InvalidOperationException($"Couldnt open dest path for avi file: {destPath}", hrEx);
 				}
 
 				// initialize the video stream
-				AVIWriterImports.AVISTREAMINFOW vidstream_header = new AVIWriterImports.AVISTREAMINFOW();
+				var vidstream_header = default(AVIWriterImports.AVISTREAMINFOW);
-				AVIWriterImports.BITMAPINFOHEADER bmih = new AVIWriterImports.BITMAPINFOHEADER();
+				var bmih = default(AVIWriterImports.BITMAPINFOHEADER);
 				parameters.PopulateBITMAPINFOHEADER24(ref bmih);
 				vidstream_header.fccType = mmioFOURCC("vids");
 				vidstream_header.dwRate = parameters.fps;
 				vidstream_header.dwScale = parameters.fps_scale;
 				vidstream_header.dwSuggestedBufferSize = (int)bmih.biSizeImage;
-				if (FAILED(AVIWriterImports.AVIFileCreateStreamW(_pAviFile, out _pAviRawVideoStream, ref vidstream_header)))
+
+				hr = AVIWriterImports.AVIFileCreateStreamW(_pAviFile, out _pAviRawVideoStream, ref vidstream_header);
+				hrEx = Marshal.GetExceptionForHR(hr);
+				if (hrEx != null)
 				{
 					CloseFile();
-					throw new InvalidOperationException("Failed opening raw video stream. Not sure how this could happen");
+					throw new InvalidOperationException("Failed opening raw video stream. Not sure how this could happen", hrEx);
 				}
 
 				// initialize audio stream
-				AVIWriterImports.AVISTREAMINFOW audstream_header = new AVIWriterImports.AVISTREAMINFOW();
+				var audstream_header = default(AVIWriterImports.AVISTREAMINFOW);
-				AVIWriterImports.WAVEFORMATEX wfex = new AVIWriterImports.WAVEFORMATEX();
+				var wfex = default(AVIWriterImports.WAVEFORMATEX);
 				parameters.PopulateWAVEFORMATEX(ref wfex);
 				audstream_header.fccType = mmioFOURCC("auds");
 				audstream_header.dwQuality = -1;
@@ -700,13 +705,16 @@ namespace BizHawk.Client.EmuHawk
 				audstream_header.dwRate = (int)wfex.nAvgBytesPerSec;
 				audstream_header.dwSampleSize = wfex.nBlockAlign;
 				audstream_header.dwInitialFrames = 1; // ??? optimal value?
-				if (FAILED(AVIWriterImports.AVIFileCreateStreamW(_pAviFile, out _pAviRawAudioStream, ref audstream_header)))
+
+				hr = AVIWriterImports.AVIFileCreateStreamW(_pAviFile, out _pAviRawAudioStream, ref audstream_header);
+				hrEx = Marshal.GetExceptionForHR(hr);
+				if (hrEx != null)
 				{
 					CloseFile();
-					throw new InvalidOperationException("Failed opening raw audio stream. Not sure how this could happen");
+					throw new InvalidOperationException("Failed opening raw audio stream. Not sure how this could happen", hrEx);
 				}
 
-				_outStatus = new OutputStatus();
+				_outStatus = new();
 				_isOpen = true;
 			}
 
@@ -726,11 +734,11 @@ namespace BizHawk.Client.EmuHawk
 				}
 
 				// encoder params
-				AVIWriterImports.AVICOMPRESSOPTIONS comprOptions = new AVIWriterImports.AVICOMPRESSOPTIONS();
+				var comprOptions = default(AVIWriterImports.AVICOMPRESSOPTIONS);
-				_currVideoCodecToken?.AllocateToAVICOMPRESSOPTIONS(ref comprOptions);
+				_currVideoCodecToken?.AllocateToAVICOMPRESSOPTIONS(out comprOptions);
 
-				bool result = AVISaveOptions(_pAviRawVideoStream, ref comprOptions, hwnd) != 0;
+				var result = AVISaveOptions(_pAviRawVideoStream, ref comprOptions, hwnd) != 0;
-				CodecToken ret = CodecToken.CreateFromAVICOMPRESSOPTIONS(ref comprOptions);
+				var ret = CodecToken.CreateFromAVICOMPRESSOPTIONS(ref comprOptions);
 
 				// so, AVISaveOptions may have changed some of the pointers
 				// if it changed the pointers, did it it free the old ones? we don't know
@@ -741,12 +749,7 @@ namespace BizHawk.Client.EmuHawk
 				// guess what? doesn't matter. We'll free them all ourselves.
 				CodecToken.DeallocateAVICOMPRESSOPTIONS(ref comprOptions);
 
-				if (result)
+				return result ? ret : null;
-				{
-					return ret;
-				}
-
-				return null;
 			}
 
 			/// <summary>begin recording</summary>
@@ -759,19 +762,19 @@ namespace BizHawk.Client.EmuHawk
 				}
 
 				// open compressed video stream
-				AVIWriterImports.AVICOMPRESSOPTIONS opts = new AVIWriterImports.AVICOMPRESSOPTIONS();
+				_currVideoCodecToken.AllocateToAVICOMPRESSOPTIONS(out var opts);
-				_currVideoCodecToken.AllocateToAVICOMPRESSOPTIONS(ref opts);
+
-				bool failed = FAILED(AVIWriterImports.AVIMakeCompressedStream(out _pAviCompressedVideoStream, _pAviRawVideoStream, ref opts, IntPtr.Zero));
+				var hr = AVIWriterImports.AVIMakeCompressedStream(out _pAviCompressedVideoStream, _pAviRawVideoStream, ref opts, IntPtr.Zero);
+				var hrEx = Marshal.GetExceptionForHR(hr);
 				CodecToken.DeallocateAVICOMPRESSOPTIONS(ref opts);
-				
+				if (hrEx != null)
-				if (failed)
 				{
 					CloseStreams();
-					throw new InvalidOperationException("Failed making compressed video stream");
+					throw new InvalidOperationException("Failed making compressed video stream", hrEx);
 				}
 
 				// set the compressed video stream input format
-				AVIWriterImports.BITMAPINFOHEADER bmih = new AVIWriterImports.BITMAPINFOHEADER();
+				var bmih = default(AVIWriterImports.BITMAPINFOHEADER);
 				if (_bit32)
 				{
 					_parameters.PopulateBITMAPINFOHEADER32(ref bmih);
@@ -781,17 +784,22 @@ namespace BizHawk.Client.EmuHawk
 					_parameters.PopulateBITMAPINFOHEADER24(ref bmih);
 				}
 
-				if (FAILED(AVIWriterImports.AVIStreamSetFormat(_pAviCompressedVideoStream, 0, ref bmih, Marshal.SizeOf(bmih))))
+				hr = AVIWriterImports.AVIStreamSetFormat(_pAviCompressedVideoStream, 0, ref bmih, Marshal.SizeOf(bmih));
+				hrEx = Marshal.GetExceptionForHR(hr);
+				if (hrEx != null)
 				{
 					_bit32 = true; // we'll try again
 					CloseStreams();
-					throw new InvalidOperationException("Failed setting compressed video stream input format");
+					throw new InvalidOperationException("Failed setting compressed video stream input format", hrEx);
 				}
 
 				// set audio stream input format
-				AVIWriterImports.WAVEFORMATEX wfex = new AVIWriterImports.WAVEFORMATEX();
+				var wfex = default(AVIWriterImports.WAVEFORMATEX);
 				_parameters.PopulateWAVEFORMATEX(ref wfex);
-				if (FAILED(AVIWriterImports.AVIStreamSetFormat(_pAviRawAudioStream, 0, ref wfex, Marshal.SizeOf(wfex))))
+
+				hr = AVIWriterImports.AVIStreamSetFormat(_pAviRawAudioStream, 0, ref wfex, Marshal.SizeOf(wfex));
+				hrEx = Marshal.GetExceptionForHR(hr);
+				if (hrEx != null)
 				{
 					CloseStreams();
 					throw new InvalidOperationException("Failed setting raw audio stream input format");
@@ -833,7 +841,7 @@ namespace BizHawk.Client.EmuHawk
 			/// <summary>
 			/// end recording
 			/// </summary>
-			public void CloseStreams()
+			private void CloseStreams()
 			{
 				if (_pAviRawAudioStream != IntPtr.Zero)
 				{
@@ -848,18 +856,20 @@ namespace BizHawk.Client.EmuHawk
 			}
 
 			// todo - why couldnt this take an ISoundProvider? it could do the timekeeping as well.. hmm
-			public void AddSamples(short[] samples)
+			public void AddSamples(IReadOnlyList<short> samples)
 			{
-				int todo = samples.Length;
+				var todo = samples.Count;
-				int idx = 0;
+				var idx = 0;
 				while (todo > 0)
 				{
-					int remain = OutputStatus.AUDIO_SEGMENT_SIZE - _outStatus.audio_buffered_shorts;
+					var remain = OutputStatus.AUDIO_SEGMENT_SIZE - _outStatus.audio_buffered_shorts;
-					int chunk = Math.Min(remain, todo);
+					var chunk = Math.Min(remain, todo);
-					for (int i = 0; i < chunk; i++)
+
+					for (var i = 0; i < chunk; i++)
 					{
 						_outStatus.BufferedShorts[_outStatus.audio_buffered_shorts++] = samples[idx++];
 					}
+
 					todo -= chunk;
 
 					if (_outStatus.audio_buffered_shorts == OutputStatus.AUDIO_SEGMENT_SIZE)
@@ -869,27 +879,28 @@ namespace BizHawk.Client.EmuHawk
 				}
 			}
 
-			private void FlushBufferedAudio()
+			private unsafe void FlushBufferedAudio()
 			{
-				int todo = _outStatus.audio_buffered_shorts;
+				var todo = _outStatus.audio_buffered_shorts;
-				int todo_realsamples = todo / 2;
+				var todo_realsamples = todo / 2;
-				IntPtr buf = GetStaticGlobalBuf(todo * 2);
+				var buf = GetStaticGlobalBuf(todo * 2);
 
-				short* sptr = (short*)buf.ToPointer();
+				var sptr = (short*)buf.ToPointer();
-				for (int i = 0; i < todo; i++)
+				for (var i = 0; i < todo; i++)
 				{
 					sptr[i] = _outStatus.BufferedShorts[i];
 				}
 
 				// (TODO - inefficient- build directly in a buffer)
-				_ = AVIWriterImports.AVIStreamWrite(_pAviRawAudioStream, _outStatus.audio_samples, todo_realsamples, buf, todo_realsamples * 4, 0, IntPtr.Zero, out var bytes_written);
+				_ = AVIWriterImports.AVIStreamWrite(_pAviRawAudioStream, _outStatus.audio_samples,
+					todo_realsamples, buf, todo_realsamples * 4, 0, IntPtr.Zero, out var bytes_written);
 				_outStatus.audio_samples += todo_realsamples;
 				_outStatus.audio_bytes += bytes_written;
 				_outStatus.audio_buffered_shorts = 0;
 			}
 
 			/// <exception cref="InvalidOperationException">attempted frame resize during encoding</exception>
-			public void AddFrame(IVideoProvider source)
+			public unsafe void AddFrame(IVideoProvider source)
 			{
 				const int AVIIF_KEYFRAME = 0x00000010;
 
@@ -897,40 +908,42 @@ namespace BizHawk.Client.EmuHawk
 					|| _parameters.height != source.BufferHeight)
 					throw new InvalidOperationException("video buffer changed between start and now");
 
-				int pitch_add = _parameters.pitch_add;
+				var pitch_add = _parameters.pitch_add;
 
-				int todo = _parameters.pitch * _parameters.height;
+				var todo = _parameters.pitch * _parameters.height;
-				int w = source.BufferWidth;
+				var w = source.BufferWidth;
-				int h = source.BufferHeight;
+				var h = source.BufferHeight;
 
 				if (!_bit32)
 				{
-					IntPtr buf = GetStaticGlobalBuf(todo);
+					var buf = GetStaticGlobalBuf(todo);
 
 					// TODO - would using a byte* be faster?
-					int[] buffer = source.GetVideoBuffer();
+					var buffer = source.GetVideoBuffer();
-					fixed (int* buffer_ptr = &buffer[0])
+					fixed (int* buffer_ptr = buffer)
 					{
-						byte* bytes_ptr = (byte*)buf.ToPointer();
+						var bytes_ptr = (byte*)buf.ToPointer();
 						{
-							byte* bp = bytes_ptr;
+							var bp = bytes_ptr;
 
 							for (int idx = w * h - w, y = 0; y < h; y++)
 							{
-								for (int x = 0; x < w; x++, idx++)
+								for (var x = 0; x < w; x++, idx++)
 								{
-									int r = (buffer[idx] >> 0) & 0xFF;
+									var r = (buffer_ptr[idx] >> 0) & 0xFF;
-									int g = (buffer[idx] >> 8) & 0xFF;
+									var g = (buffer_ptr[idx] >> 8) & 0xFF;
-									int b = (buffer[idx] >> 16) & 0xFF;
+									var b = (buffer_ptr[idx] >> 16) & 0xFF;
 									*bp++ = (byte)r;
 									*bp++ = (byte)g;
 									*bp++ = (byte)b;
 								}
+
 								idx -= w * 2;
 								bp += pitch_add;
 							}
 
-							int ret = AVIWriterImports.AVIStreamWrite(_pAviCompressedVideoStream, _outStatus.video_frames, 1, new IntPtr(bytes_ptr), todo, AVIIF_KEYFRAME, IntPtr.Zero, out var bytes_written);
+							_ = AVIWriterImports.AVIStreamWrite(_pAviCompressedVideoStream, _outStatus.video_frames,
+								1, new(bytes_ptr), todo, AVIIF_KEYFRAME, IntPtr.Zero, out var bytes_written);
 							_outStatus.video_bytes += bytes_written;
 							_outStatus.video_frames++;
 						}
@@ -938,30 +951,32 @@ namespace BizHawk.Client.EmuHawk
 				}
 				else // 32 bit
 				{
-					IntPtr buf = GetStaticGlobalBuf(todo * 4);
+					var buf = GetStaticGlobalBuf(todo * 4);
-					int[] buffer = source.GetVideoBuffer();
+					var buffer = source.GetVideoBuffer();
-					fixed (int* buffer_ptr = &buffer[0])
+					fixed (int* buffer_ptr = buffer)
 					{
-						byte* bytes_ptr = (byte*)buf.ToPointer();
+						var bytes_ptr = (byte*)buf.ToPointer();
 						{
-							byte* bp = bytes_ptr;
+							var bp = bytes_ptr;
 
 							for (int idx = w * h - w, y = 0; y < h; y++)
 							{
-								for (int x = 0; x < w; x++, idx++)
+								for (var x = 0; x < w; x++, idx++)
 								{
-									int r = (buffer[idx] >> 0) & 0xFF;
+									var r = (buffer_ptr[idx] >> 0) & 0xFF;
-									int g = (buffer[idx] >> 8) & 0xFF;
+									var g = (buffer_ptr[idx] >> 8) & 0xFF;
-									int b = (buffer[idx] >> 16) & 0xFF;
+									var b = (buffer_ptr[idx] >> 16) & 0xFF;
 									*bp++ = (byte)r;
 									*bp++ = (byte)g;
 									*bp++ = (byte)b;
 									*bp++ = 0;
 								}
+
 								idx -= w * 2;
 							}
 
-							int ret = AVIWriterImports.AVIStreamWrite(_pAviCompressedVideoStream, _outStatus.video_frames, 1, new IntPtr(bytes_ptr), todo * 3, AVIIF_KEYFRAME, IntPtr.Zero, out var bytes_written);
+							_ = AVIWriterImports.AVIStreamWrite(_pAviCompressedVideoStream, _outStatus.video_frames,
+								1, new(bytes_ptr), todo * 3, AVIIF_KEYFRAME, IntPtr.Zero, out var bytes_written);
 							_outStatus.video_bytes += bytes_written;
 							_outStatus.video_frames++;
 						}
@@ -974,13 +989,11 @@ namespace BizHawk.Client.EmuHawk
 		public void SetDefaultVideoCodecToken(Config config)
 		{
 			var ct = CodecToken.DeSerialize(config.AviCodecToken);
-			_currVideoCodecToken = ct ?? throw new Exception($"No default {nameof(config.AviCodecToken)} in config!");
+			_currVideoCodecToken = ct ?? throw new($"No default {nameof(config.AviCodecToken)} in config!");
 		}
 
 		public string DesiredExtension()
-		{
+			=> "avi";
-			return "avi";
-		}
 
 		public bool UsesAudio => _parameters.has_audio;
 

src/BizHawk.Client.EmuHawk/CustomControls/FolderBrowserDialogEx.cs

@@ -7,6 +7,8 @@ using System.Windows.Forms;
 
 using BizHawk.Common;
 
+using static BizHawk.Common.ShlobjImports;
+
 namespace BizHawk.Client.EmuHawk
 {
 	/// <summary>
@@ -21,8 +23,8 @@ namespace BizHawk.Client.EmuHawk
 	/// </remarks>
 	public sealed class FolderBrowserEx : Component
 	{
-		/// <remarks>is this supposed to be public? we're obviously not using it at callsites at the moment --yoshi</remarks>
+		private const BROWSEINFO.FLAGS BrowseOptions = BROWSEINFO.FLAGS.RestrictToFilesystem | BROWSEINFO.FLAGS.RestrictToDomain |
-		private readonly Win32Imports.BROWSEINFO.FLAGS publicOptions = Win32Imports.BROWSEINFO.FLAGS.RestrictToFilesystem | Win32Imports.BROWSEINFO.FLAGS.RestrictToDomain;
+			BROWSEINFO.FLAGS.NewDialogStyle | BROWSEINFO.FLAGS.ShowTextBox;
 
 		public string Description = "Please select a folder below:";
 
@@ -31,54 +33,78 @@ namespace BizHawk.Client.EmuHawk
 		/// <summary>Shows the folder browser dialog box with the specified owner window.</summary>
 		public DialogResult ShowDialog(IWin32Window owner = null)
 		{
-			const Win32Imports.BROWSEINFO.FLAGS privateOptions = Win32Imports.BROWSEINFO.FLAGS.NewDialogStyle | Win32Imports.BROWSEINFO.FLAGS.ShowTextBox;
 			const int startLocation = 0; // = Desktop CSIDL
 			int Callback(IntPtr hwnd, uint uMsg, IntPtr lParam, IntPtr lpData)
 			{
-				if (uMsg == 1)
+				if (uMsg == BFFM_INITIALIZED)
 				{
 					var str = Marshal.StringToHGlobalUni(SelectedPath);
-					Win32Imports.SendMessage(hwnd, 0x400 + 103, (IntPtr) 1, str);
+					try
-					Marshal.FreeHGlobal(str);
+					{
+						WmImports.SendMessage(hwnd, BFFM_SETSELECTIONW, new(1), str);
+					}
+					finally
+					{
+						Marshal.FreeHGlobal(str);
+					}
 				}
+
 				return 0;
 			}
 
-			var hWndOwner = owner?.Handle ?? Win32Imports.GetActiveWindow();
+			var hWndOwner = owner?.Handle ?? WmImports.GetActiveWindow();
-			_ = Win32Imports.SHGetSpecialFolderLocation(hWndOwner, startLocation, out var pidlRoot);
+			_ = SHGetSpecialFolderLocation(hWndOwner, startLocation, out var pidlRoot);
-			if (pidlRoot == IntPtr.Zero) return DialogResult.Cancel;
+			if (pidlRoot == IntPtr.Zero)
-			var mergedOptions = publicOptions | privateOptions;
-			if ((mergedOptions & Win32Imports.BROWSEINFO.FLAGS.NewDialogStyle) != 0 && ApartmentState.MTA == Application.OleRequired())
 			{
-				mergedOptions &= ~Win32Imports.BROWSEINFO.FLAGS.NewDialogStyle;
+				return DialogResult.Cancel;
 			}
 
-			IntPtr pidlRet = default;
+			var browseOptions = BrowseOptions;
+			if (ApartmentState.MTA == Application.OleRequired())
+			{
+				browseOptions &= ~BROWSEINFO.FLAGS.NewDialogStyle;
+			}
+
+			var pidlRet = IntPtr.Zero;
 			try
 			{
 				var buffer = Marshal.AllocHGlobal(Win32Imports.MAX_PATH);
-				var bi = new Win32Imports.BROWSEINFO
+				var bi = new BROWSEINFO
 				{
 					hwndOwner = hWndOwner,
 					pidlRoot = pidlRoot,
 					pszDisplayName = buffer,
 					lpszTitle = Description,
-					ulFlags = mergedOptions,
+					ulFlags = browseOptions,
 					lpfn = Callback
 				};
-				pidlRet = Win32Imports.SHBrowseForFolder(ref bi);
+
+				pidlRet = SHBrowseForFolder(ref bi);
 				Marshal.FreeHGlobal(buffer);
-				if (pidlRet == IntPtr.Zero) return DialogResult.Cancel; // user clicked Cancel
+				if (pidlRet == IntPtr.Zero)
-				var sb = new StringBuilder(Win32Imports.MAX_PATH);
+				{
-				if (Win32Imports.SHGetPathFromIDList(pidlRet, sb) == 0) return DialogResult.Cancel;
+					return DialogResult.Cancel; // user clicked Cancel
-				SelectedPath = sb.ToString();
+				}
+
+				var path = new StringBuilder(Win32Imports.MAX_PATH);
+				if (SHGetPathFromIDList(pidlRet, path) == 0)
+				{
+					return DialogResult.Cancel;
+				}
+
+				SelectedPath = path.ToString();
 			}
 			finally
 			{
-				_ = Win32Imports.SHGetMalloc(out var malloc);
+				_ = SHGetMalloc(out var malloc);
 				malloc.Free(pidlRoot);
-				if (pidlRet != IntPtr.Zero) malloc.Free(pidlRet);
+
+				if (pidlRet != IntPtr.Zero)
+				{
+					malloc.Free(pidlRet);
+				}
 			}
+
 			return DialogResult.OK;
 		}
 	}

src/BizHawk.Client.EmuHawk/CustomControls/InputWidget.cs

@@ -63,7 +63,11 @@ namespace BizHawk.Client.EmuHawk
 
 		protected override void OnMouseClick(MouseEventArgs e)
 		{
-			if (!OSTailoredCode.IsUnixHost) Win32Imports.HideCaret(Handle);
+			if (!OSTailoredCode.IsUnixHost)
+			{
+				WmImports.HideCaret(Handle);
+			}
+
 			base.OnMouseClick(e);
 		}
 
@@ -253,7 +257,10 @@ namespace BizHawk.Client.EmuHawk
 
 		protected override void OnGotFocus(EventArgs e)
 		{
-			if (!OSTailoredCode.IsUnixHost) Win32Imports.HideCaret(Handle);
+			if (!OSTailoredCode.IsUnixHost)
+			{
+				WmImports.HideCaret(Handle);
+			}
 		}
 
 		protected override bool ProcessCmdKey(ref Message msg, Keys keyData)

src/BizHawk.Client.EmuHawk/Extensions/ControlExtensions.cs

@@ -10,11 +10,14 @@ using System.Linq;
 using System.Reflection;
 using System.Text;
 using System.Windows.Forms;
+
 using BizHawk.Client.Common;
 using BizHawk.Common;
 using BizHawk.Common.ReflectionExtensions;
 using BizHawk.Emulation.Common;
 
+using static BizHawk.Common.CommctrlImports;
+
 namespace BizHawk.Client.EmuHawk
 {
 	public static class ControlExtensions
@@ -183,32 +186,42 @@ namespace BizHawk.Client.EmuHawk
 		/// <exception cref="Win32Exception">unmanaged call failed</exception>
 		public static void SetSortIcon(this ListView listViewControl, int columnIndex, SortOrder order)
 		{
-			if (OSTailoredCode.IsUnixHost) return;
+			if (OSTailoredCode.IsUnixHost)
+			{
+				return;
+			}
 
-			const int LVM_GETHEADER = 4127;
+			var columnHeader = WmImports.SendMessage(listViewControl.Handle, LVM_GETHEADER, IntPtr.Zero, IntPtr.Zero);
-			const int HDM_GETITEM = 4619;
-			const int HDM_SETITEM = 4620;
-			var columnHeader = Win32Imports.SendMessage(listViewControl.Handle, LVM_GETHEADER, IntPtr.Zero, IntPtr.Zero);
 			for (int columnNumber = 0, l = listViewControl.Columns.Count; columnNumber < l; columnNumber++)
 			{
 				var columnPtr = new IntPtr(columnNumber);
-				var item = new Win32Imports.HDITEM { mask = Win32Imports.HDITEM.Mask.Format };
+				var item = new HDITEM { mask = HDITEM.Mask.Format };
-				if (Win32Imports.SendMessage(columnHeader, HDM_GETITEM, columnPtr, ref item) == IntPtr.Zero) throw new Win32Exception();
+				if (SendMessage(columnHeader, HDM_GETITEM, columnPtr, ref item) == IntPtr.Zero)
+				{
+					throw new Win32Exception();
+				}
+
 				if (columnNumber != columnIndex || order == SortOrder.None)
 				{
-					item.fmt &= ~Win32Imports.HDITEM.Format.SortDown & ~Win32Imports.HDITEM.Format.SortUp;
+					item.fmt &= ~HDITEM.Format.SortDown & ~HDITEM.Format.SortUp;
 				}
-				else if (order == SortOrder.Ascending)
+				// ReSharper disable once SwitchStatementMissingSomeEnumCasesNoDefault
+				else switch (order)
 				{
-					item.fmt &= ~Win32Imports.HDITEM.Format.SortDown;
+					case SortOrder.Ascending:
-					item.fmt |= Win32Imports.HDITEM.Format.SortUp;
+						item.fmt &= ~HDITEM.Format.SortDown;
+						item.fmt |= HDITEM.Format.SortUp;
+						break;
+					case SortOrder.Descending:
+						item.fmt &= ~HDITEM.Format.SortUp;
+						item.fmt |= HDITEM.Format.SortDown;
+						break;
 				}
-				else if (order == SortOrder.Descending)
+
+				if (SendMessage(columnHeader, HDM_SETITEM, columnPtr, ref item) == IntPtr.Zero)
 				{
-					item.fmt &= ~Win32Imports.HDITEM.Format.SortUp;
+					throw new Win32Exception();
-					item.fmt |= Win32Imports.HDITEM.Format.SortDown;
 				}
-				if (Win32Imports.SendMessage(columnHeader, HDM_SETITEM, columnPtr, ref item) == IntPtr.Zero) throw new Win32Exception();
 			}
 		}
 

src/BizHawk.Client.EmuHawk/tools/SNES/SNESGraphicsDebugger.cs

@@ -868,7 +868,7 @@ namespace BizHawk.Client.EmuHawk
 		{
 			groupFreeze.SuspendLayout();
 
-			Win32Imports.SendMessage(groupFreeze.Handle, 11, (IntPtr)0, IntPtr.Zero); //WM_SETREDRAW false
+			WmImports.SendMessage(groupFreeze.Handle, 11, (IntPtr)0, IntPtr.Zero); //WM_SETREDRAW false
 
 			var tp = tabctrlDetails.SelectedTab;
 
@@ -886,7 +886,7 @@ namespace BizHawk.Client.EmuHawk
 
 			groupFreeze.ResumeLayout();
 
-			Win32Imports.SendMessage(groupFreeze.Handle, 11, (IntPtr)1, IntPtr.Zero); //WM_SETREDRAW true
+			WmImports.SendMessage(groupFreeze.Handle, 11, (IntPtr)1, IntPtr.Zero); //WM_SETREDRAW true
 			groupFreeze.Refresh();
 		}
 

src/BizHawk.Common/Extensions/PathExtensions.cs

@@ -82,7 +82,7 @@ namespace BizHawk.Common.PathExtensions
 				if (File.Exists(path1.SubstringBefore('|'))) return FileAttributes.Normal;
 				throw new FileNotFoundException();
 			}
-			var path = new StringBuilder(260 /* = MAX_PATH */);
+			var path = new StringBuilder(Win32Imports.MAX_PATH);
 			return Win32Imports.PathRelativePathTo(path, fromPath, GetPathAttribute(fromPath), toPath, GetPathAttribute(toPath))
 				? path.ToString()
 				: throw new ArgumentException(message: "Paths must have a common prefix", paramName: nameof(toPath));

src/BizHawk.Common/MemoryBlock/MemoryBlockWindowsPal.cs

@@ -1,6 +1,6 @@
 using System;
 
-using static BizHawk.Common.Kernel32Imports;
+using static BizHawk.Common.MemoryApiImports;
 using static BizHawk.Common.MemoryBlock;
 
 namespace BizHawk.Common

src/BizHawk.Common/Win32/AVIWriterImports.cs

@@ -4,6 +4,8 @@
 using System;
 using System.Runtime.InteropServices;
 
+// ReSharper disable FieldCanBeMadeReadOnly.Global
+
 namespace BizHawk.Common
 {
 	public static class AVIWriterImports
@@ -35,7 +37,8 @@ namespace BizHawk.Common
 			public RECT rcFrame;
 			public int dwEditCount;
 			public int dwFormatChangeCount;
-			[MarshalAs(UnmanagedType.LPWStr, SizeConst=64)] public string szName;
+			[MarshalAs(UnmanagedType.LPWStr, SizeConst = 64)]
+			public string szName;
 
 			[StructLayout(LayoutKind.Sequential, Pack = 1)]
 			public struct RECT
@@ -63,9 +66,7 @@ namespace BizHawk.Common
 			public uint biClrImportant;
 
 			public void Init()
-			{
+				=> biSize = (uint)Marshal.SizeOf(this);
-				biSize = (uint)Marshal.SizeOf(this);
-			}
 		}
 
 		[StructLayout(LayoutKind.Sequential)]
@@ -96,9 +97,7 @@ namespace BizHawk.Common
 			public ushort cbSize;
 
 			public void Init()
-			{
+				=> cbSize = (ushort)Marshal.SizeOf(this);
-				cbSize = (ushort)Marshal.SizeOf(this);
-			}
 		}
 
 		/// <summary>Create a new stream in an existing file and creates an interface to the new stream</summary>

src/BizHawk.Common/Win32/CWDHacks.cs

@@ -1,38 +1,60 @@
 using System;
 using System.Runtime.InteropServices;
-using System.Text;
 
 namespace BizHawk.Common
 {
 	/// <summary>Gets/Sets the current working directory while bypassing the security checks triggered by the public API (<see cref="Environment.CurrentDirectory"/>).</summary>
-	public static unsafe class CWDHacks
+	public static class CWDHacks
 	{
-		private const uint BUFFER_LEN = 0x200U;
+		[DllImport("kernel32.dll", CharSet = CharSet.Unicode, SetLastError = true, ExactSpelling = true)]
+		private static extern unsafe int GetCurrentDirectoryW(int nBufferLength, char* lpBuffer);
 
-		private static readonly byte[] BUFFER = new byte[BUFFER_LEN];
+		[DllImport("kernel32.dll", CharSet = CharSet.Unicode, SetLastError = true, ExactSpelling = true)]
-
+		private static extern bool SetCurrentDirectoryW(string lpPathName);
-		[DllImport("kernel32.dll", SetLastError = true)]
-		private static extern uint GetCurrentDirectoryW(uint nBufferLength, byte* pBuffer);
-
-		[DllImport("kernel32.dll", SetLastError = true)]
-		private static extern bool SetCurrentDirectoryW(byte* lpPathName);
 
 		public static bool Set(string newCWD)
-		{
+			=> SetCurrentDirectoryW(newCWD);
-			fixed (byte* pstr = &Encoding.Unicode.GetBytes($"{newCWD}\0")[0])
-				return SetCurrentDirectoryW(pstr);
-		}
 
-		public static string Get()
+		public static unsafe string Get()
 		{
-			uint result;
+			static Exception GetExceptionForFailure()
-			fixed (byte* pBuf = &BUFFER[0]) result = GetCurrentDirectoryW(BUFFER_LEN, pBuf);
+			{
-			if (result <= BUFFER_LEN && result is not 0U) return Encoding.Unicode.GetString(BUFFER, 0, (int) (2U * result));
+				var ex = Marshal.GetExceptionForHR(Marshal.GetHRForLastWin32Error())
-			var buf = new byte[result];
+					?? new("Marshal.GetExceptionForHR returned null?");
-			uint result1;
+				return new InvalidOperationException("GetCurrentDirectoryW returned 0!", ex);
-			fixed (byte* pBuf = &buf[0]) result1 = GetCurrentDirectoryW(BUFFER_LEN, pBuf);
+			}
-			if (result1 == result) return Encoding.Unicode.GetString(buf, 0, (int) (2U * result));
+
-			throw new Exception();
+			const int STARTING_BUF_SIZE = Win32Imports.MAX_PATH + 1;
+			var startingBuffer = stackalloc char[STARTING_BUF_SIZE];
+			var ret = GetCurrentDirectoryW(STARTING_BUF_SIZE, startingBuffer);
+			switch (ret)
+			{
+				case 0:
+					throw GetExceptionForFailure();
+				case < STARTING_BUF_SIZE: // ret should be smaller than the buffer, as ret doesn't include null terminator
+					return new(startingBuffer, 0, ret);
+			}
+
+			// since current directory could suddenly grow (due to it being global / modifiable by other threads), a while true loop is used here
+			// although it's fairly unlikely we'll even reach this point, MAX_PATH can only be bypassed under certain circumstances
+			while (true)
+			{
+				var bufSize = ret + 1;
+				var buffer = new char[bufSize];
+				fixed (char* p = buffer)
+				{
+					ret = GetCurrentDirectoryW(bufSize, p);
+					if (ret == 0)
+					{
+						throw GetExceptionForFailure();
+					}
+
+					if (ret < bufSize)
+					{
+						return new(p, 0, ret);
+					}
+				}
+			}
 		}
 	}
 }

src/BizHawk.Common/Win32/CommctrlImports.cs

@@ -0,0 +1,57 @@
+#nullable disable
+
+using System;
+using System.Runtime.InteropServices;
+
+// ReSharper disable FieldCanBeMadeReadOnly.Global
+// ReSharper disable UnusedMember.Global
+
+namespace BizHawk.Common
+{
+	public static class CommctrlImports
+	{
+		public const int LVM_GETHEADER = 4127;
+		public const int HDM_GETITEM = 4619;
+		public const int HDM_SETITEM = 4620;
+
+		[StructLayout(LayoutKind.Sequential)]
+		public struct HDITEM
+		{
+			public Mask mask;
+			public int cxy;
+			[MarshalAs(UnmanagedType.LPTStr)]
+			public string pszText;
+			public IntPtr hbm;
+			public int cchTextMax;
+			public Format fmt;
+			public IntPtr lParam;
+
+			// _WIN32_IE >= 0x0300
+			public int iImage;
+			public int iOrder;
+
+			// _WIN32_IE >= 0x0500
+			public uint type;
+			public IntPtr pvFilter;
+
+			// _WIN32_WINNT >= 0x0600
+			public uint state;
+
+			[Flags]
+			public enum Mask
+			{
+				Format = 0x4
+			}
+
+			[Flags]
+			public enum Format
+			{
+				SortDown = 0x200,
+				SortUp = 0x400
+			}
+		}
+
+		[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
+		public static extern IntPtr SendMessage(IntPtr hWnd, uint msg, IntPtr wParam, ref HDITEM lParam);
+	}
+}

src/BizHawk.Common/Win32/HeapApiImports.cs

@@ -0,0 +1,22 @@
+using System;
+using System.Runtime.InteropServices;
+
+// ReSharper disable FieldCanBeMadeReadOnly.Global
+// ReSharper disable UnusedMember.Global
+
+namespace BizHawk.Common
+{
+	public static class HeapApiImports
+	{
+		[DllImport("kernel32.dll", SetLastError = true)]
+		public static extern IntPtr GetProcessHeap();
+
+		[DllImport("kernel32.dll", SetLastError = false)]
+		public static extern IntPtr HeapAlloc(IntPtr hHeap, uint dwFlags, int dwBytes);
+
+		/// <remarks>used in <c>#if false</c> code in <c>AviWriter.CodecToken.DeallocateAVICOMPRESSOPTIONS</c>, don't delete it</remarks>
+		[DllImport("kernel32.dll", SetLastError = true)]
+		[return: MarshalAs(UnmanagedType.Bool)]
+		public static extern bool HeapFree(IntPtr hHeap, uint dwFlags, IntPtr lpMem);
+	}
+}

src/BizHawk.Common/Win32/MemoryApiImports.cs

@@ -2,10 +2,11 @@
 using System.Runtime.InteropServices;
 
 // ReSharper disable FieldCanBeMadeReadOnly.Global
+// ReSharper disable UnusedMember.Global
 
 namespace BizHawk.Common
 {
-	public static class Kernel32Imports
+	public static class MemoryApiImports
 	{
 		[Flags]
 		public enum AllocationType : uint

src/BizHawk.Common/Win32/MotWHack.cs

@@ -3,6 +3,7 @@ namespace BizHawk.Common
 	/// <remarks>This code (and an import for <see cref="Win32Imports.DeleteFileW"/>) is duplicated in each executable project because it needs to be used before loading assemblies.</remarks>
 	public static class MotWHack
 	{
-		public static void RemoveMOTW(string path) => Win32Imports.DeleteFileW($"{path}:Zone.Identifier");
+		public static void RemoveMOTW(string path)
+			=> Win32Imports.DeleteFileW($"{path}:Zone.Identifier");
 	}
 }

src/BizHawk.Common/Win32/ShellLinkImports.cs

@@ -4,6 +4,8 @@ using System;
 using System.Runtime.InteropServices;
 using System.Text;
 
+// ReSharper disable FieldCanBeMadeReadOnly.Global
+
 namespace BizHawk.Common
 {
 	public static class ShellLinkImports
@@ -19,15 +21,21 @@ namespace BizHawk.Common
 			public uint nFileSizeLow;
 			public uint dwReserved0;
 			public uint dwReserved1;
-			[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 260)] public string cFileName;
+			[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 260)]
-			[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 14)] public string cAlternateFileName;
+			public string cFileName;
+			[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 14)]
+			public string cAlternateFileName;
 		}
 
 		[Flags]
-		public enum SLGP_FLAGS {}
+		public enum SLGP_FLAGS
+		{
+		}
 
 		[Flags]
-		public enum SLR_FLAGS {}
+		public enum SLR_FLAGS
+		{
+		}
 
 		/// <summary>The IShellLink interface allows Shell links to be created, modified, and resolved</summary>
 		[ComImport]
@@ -108,6 +116,8 @@ namespace BizHawk.Common
 		/// <remarks>CLSID_ShellLink from ShlGuid.h</remarks>
 		[ComImport]
 		[Guid("00021401-0000-0000-C000-000000000046")]
-		public class ShellLink /* : IPersistFile, IShellLinkW */ {}
+		public class ShellLink /* : IPersistFile, IShellLinkW */
+		{
+		}
 	}
 }

src/BizHawk.Common/Win32/ShlobjImports.cs

@@ -0,0 +1,93 @@
+#nullable disable
+
+using System;
+using System.Runtime.InteropServices;
+using System.Text;
+
+// ReSharper disable FieldCanBeMadeReadOnly.Global
+// ReSharper disable UnusedMember.Global
+
+namespace BizHawk.Common
+{
+	public static class ShlobjImports
+	{
+		public const int BFFM_INITIALIZED = 1;
+		public const int BFFM_SETSELECTIONW = 0x400 + 103;
+
+		[UnmanagedFunctionPointer(CallingConvention.Winapi)]
+		public delegate int BFFCALLBACK(IntPtr hwnd, uint uMsg, IntPtr lParam, IntPtr lpData);
+
+		[StructLayout(LayoutKind.Sequential, Pack = 8)]
+		public struct BROWSEINFO
+		{
+			public IntPtr hwndOwner;
+			public IntPtr pidlRoot;
+			public IntPtr pszDisplayName;
+			[MarshalAs(UnmanagedType.LPTStr)]
+			public string lpszTitle;
+			public FLAGS ulFlags;
+			[MarshalAs(UnmanagedType.FunctionPtr)]
+			public BFFCALLBACK lpfn;
+			public IntPtr lParam;
+			public int iImage;
+
+			[Flags]
+			public enum FLAGS
+			{
+				/// <remarks>BIF_RETURNONLYFSDIRS</remarks>
+				RestrictToFilesystem = 0x0001,
+				/// <remarks>BIF_DONTGOBELOWDOMAIN</remarks>
+				RestrictToDomain = 0x0002,
+				/// <remarks>BIF_RETURNFSANCESTORS</remarks>
+				RestrictToSubfolders = 0x0008,
+				/// <remarks>BIF_EDITBOX</remarks>
+				ShowTextBox = 0x0010,
+				/// <remarks>BIF_VALIDATE</remarks>
+				ValidateSelection = 0x0020,
+				/// <remarks>BIF_NEWDIALOGSTYLE</remarks>
+				NewDialogStyle = 0x0040,
+				/// <remarks>BIF_BROWSEFORCOMPUTER</remarks>
+				BrowseForComputer = 0x1000,
+				/// <remarks>BIF_BROWSEFORPRINTER</remarks>
+				BrowseForPrinter = 0x2000,
+				/// <remarks>BIF_BROWSEINCLUDEFILES</remarks>
+				BrowseForEverything = 0x4000
+			}
+		}
+
+		[Guid("00000002-0000-0000-C000-000000000046")]
+		[InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
+		public interface IMalloc
+		{
+			[PreserveSig]
+			IntPtr Alloc([In] int cb);
+
+			[PreserveSig]
+			IntPtr Realloc([In] IntPtr pv, [In] int cb);
+
+			[PreserveSig]
+			void Free([In] IntPtr pv);
+
+			[PreserveSig]
+			int GetSize([In] IntPtr pv);
+
+			[PreserveSig]
+			int DidAlloc(IntPtr pv);
+
+			[PreserveSig]
+			void HeapMinimize();
+		}
+
+		[DllImport("shell32.dll", CharSet = CharSet.Auto)]
+		public static extern IntPtr SHBrowseForFolder(ref BROWSEINFO bi);
+
+		[DllImport("shell32.dll")]
+		public static extern int SHGetMalloc(out IMalloc ppMalloc);
+
+		[DllImport("shell32.dll", CharSet = CharSet.Auto)]
+		public static extern int SHGetPathFromIDList(IntPtr pidl, StringBuilder pszPath);
+
+		[DllImport("shell32.dll")]
+		public static extern int SHGetSpecialFolderLocation(IntPtr hwndOwner, int nFolder, out IntPtr ppidl);
+	}
+}

src/BizHawk.Common/Win32/ThreadHacks.cs

@@ -15,35 +15,11 @@ namespace BizHawk.Common
 	{
 		public const uint QS_ALLINPUT = 0x4FFU;
 		public const uint MWMO_INPUTAVAILABLE = 0x0004U;
-		public const uint PM_REMOVE = 0x0001U;
-
-		[StructLayout(LayoutKind.Sequential)]
-		public struct MSG
-		{
-			public IntPtr hwnd;
-			public uint message;
-			public IntPtr wParam;
-			public IntPtr lParam;
-			public uint time;
-			public int x;
-			public int y;
-		}
-
-		[DllImport("user32.dll")]
-		public static extern IntPtr DispatchMessage([In] ref MSG lpMsg);
 
 		[DllImport("user32.dll", SetLastError = true)]
 		public static extern uint MsgWaitForMultipleObjectsEx(uint nCount, IntPtr[] pHandles, uint dwMilliseconds, uint dwWakeMask, uint dwFlags);
 
-		[DllImport("user32.dll")]
+		[DllImport("kernel32.dll", SetLastError = true, ExactSpelling = true)]
-		[return: MarshalAs(UnmanagedType.Bool)]
-		public static extern bool PeekMessage(out MSG lpMsg, IntPtr hWnd, uint wMsgFilterMin, uint wMsgFilterMax, uint wRemoveMsg);
-
-		[DllImport("user32.dll")]
-		[return: MarshalAs(UnmanagedType.Bool)]
-		public static extern bool TranslateMessage([In] ref MSG lpMsg);
-
-		[DllImport("kernel32", SetLastError = true, ExactSpelling = true)]
 		public static extern int WaitForSingleObject(SafeWaitHandle handle, uint milliseconds);
 	}
 }

src/BizHawk.Common/Win32/Win32Imports.cs

@@ -7,227 +7,29 @@ using System.Text;
 
 namespace BizHawk.Common
 {
+	/// <summary>
+	/// This is more just an assorted bunch of Win32 functions
+	/// </summary>
 	public static class Win32Imports
 	{
 		public const int MAX_PATH = 260;
-		public const uint PM_REMOVE = 0x0001U;
-		public static readonly IntPtr HWND_MESSAGE = new(-3);
-		public const int GWLP_USERDATA = -21;
 
-		public delegate int BFFCALLBACK(IntPtr hwnd, uint uMsg, IntPtr lParam, IntPtr lpData);
+		[DllImport("kernel32.dll", SetLastError = true, CharSet = CharSet.Unicode, ExactSpelling = true)]
-
-		[StructLayout(LayoutKind.Sequential, Pack = 8)]
-		public struct BROWSEINFO
-		{
-			public IntPtr hwndOwner;
-			public IntPtr pidlRoot;
-			public IntPtr pszDisplayName;
-			[MarshalAs(UnmanagedType.LPTStr)] public string lpszTitle;
-			public FLAGS ulFlags;
-			[MarshalAs(UnmanagedType.FunctionPtr)] public BFFCALLBACK lpfn;
-			public IntPtr lParam;
-			public int iImage;
-
-			[Flags]
-			public enum FLAGS
-			{
-				/// <remarks>BIF_RETURNONLYFSDIRS</remarks>
-				RestrictToFilesystem = 0x0001,
-				/// <remarks>BIF_DONTGOBELOWDOMAIN</remarks>
-				RestrictToDomain = 0x0002,
-				/// <remarks>BIF_RETURNFSANCESTORS</remarks>
-				RestrictToSubfolders = 0x0008,
-				/// <remarks>BIF_EDITBOX</remarks>
-				ShowTextBox = 0x0010,
-				/// <remarks>BIF_VALIDATE</remarks>
-				ValidateSelection = 0x0020,
-				/// <remarks>BIF_NEWDIALOGSTYLE</remarks>
-				NewDialogStyle = 0x0040,
-				/// <remarks>BIF_BROWSEFORCOMPUTER</remarks>
-				BrowseForComputer = 0x1000,
-				/// <remarks>BIF_BROWSEFORPRINTER</remarks>
-				BrowseForPrinter = 0x2000,
-				/// <remarks>BIF_BROWSEINCLUDEFILES</remarks>
-				BrowseForEverything = 0x4000
-			}
-		}
-
-		[StructLayout(LayoutKind.Sequential)]
-		public struct HDITEM
-		{
-			public Mask mask;
-			public int cxy;
-			[MarshalAs(UnmanagedType.LPTStr)] public string pszText;
-			public IntPtr hbm;
-			public int cchTextMax;
-			public Format fmt;
-			public IntPtr lParam;
-
-			// _WIN32_IE >= 0x0300
-			public int iImage;
-			public int iOrder;
-
-			// _WIN32_IE >= 0x0500
-			public uint type;
-			public IntPtr pvFilter;
-
-			// _WIN32_WINNT >= 0x0600
-			public uint state;
-
-			[Flags]
-			public enum Mask
-			{
-				Format = 0x4
-			}
-
-			[Flags]
-			public enum Format
-			{
-				SortDown = 0x200,
-				SortUp = 0x400
-			}
-		}
-
-		[StructLayout(LayoutKind.Sequential)]
-		public struct MSG
-		{
-			public IntPtr hwnd;
-			public uint message;
-			public IntPtr wParam;
-			public IntPtr lParam;
-			public uint time;
-			public int x;
-			public int y;
-		}
-
-		public delegate IntPtr WNDPROC(IntPtr hWnd, uint uMsg, IntPtr wParam, IntPtr lParam);
-
-		[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
-		public struct WNDCLASS
-		{
-			public uint style;
-			public WNDPROC lpfnWndProc;
-			public int cbClsExtra;
-			public int cbWndExtra;
-			public IntPtr hInstance;
-			public IntPtr hIcon;
-			public IntPtr hCursor;
-			public IntPtr hbrBackground;
-			public string lpszMenuName;
-			public string lpszClassName;
-		}
-
-		[Guid("00000002-0000-0000-C000-000000000046")]
-		[InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
-		public interface IMalloc
-		{
-			[PreserveSig] IntPtr Alloc([In] int cb);
-			[PreserveSig] IntPtr Realloc([In] IntPtr pv, [In] int cb);
-			[PreserveSig] void Free([In] IntPtr pv);
-			[PreserveSig] int GetSize([In] IntPtr pv);
-			[PreserveSig] int DidAlloc(IntPtr pv);
-			[PreserveSig] void HeapMinimize();
-		}
-
-		[DllImport("msvcrt.dll", CallingConvention = CallingConvention.Cdecl)]
-		public static extern uint _control87(uint @new, uint mask);
-
-		[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
-		public static extern IntPtr CreateWindowEx(int dwExStyle, IntPtr lpClassName, string lpWindowName,
-			int dwStyle, int X, int Y, int nWidth, int nHeight, IntPtr hWndParent, IntPtr hMenu, IntPtr hInstance, IntPtr lpParam);
-
-		[DllImport("kernel32.dll", EntryPoint = "DeleteFileW", SetLastError = true, CharSet = CharSet.Unicode, ExactSpelling = true)]
 		public static extern bool DeleteFileW([MarshalAs(UnmanagedType.LPWStr)] string lpFileName);
 
-		[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
-		public static extern IntPtr DefWindowProc(IntPtr hWnd, uint uMsg, IntPtr wParam, IntPtr lParam);
-
-		[DllImport("user32.dll", SetLastError = true)]
-		[return: MarshalAs(UnmanagedType.Bool)]
-		public static extern bool DestroyWindow(IntPtr hWnd);
-
-		[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
-		public static extern IntPtr DispatchMessage([In] ref MSG lpMsg);
-
-		[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
-		public static extern IntPtr FindWindowEx(IntPtr parentHandle, IntPtr hWndChildAfter, string className, string windowTitle);
-
-		[DllImport("user32.dll")]
-		public static extern IntPtr GetActiveWindow();
-
 		[DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
 		public static extern IntPtr GetModuleHandle(string lpModuleName);
 
-		[DllImport("kernel32", SetLastError = true, EntryPoint = "GetProcAddress")]
-		public static extern IntPtr GetProcAddressOrdinal(IntPtr hModule, IntPtr procName);
-
-		[DllImport("kernel32.dll", SetLastError = true)]
-		public static extern IntPtr GetProcessHeap();
-
-		[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
-		public static extern IntPtr GetWindowLongPtr(IntPtr hWnd, int nIndex);
-
-		[DllImport("kernel32.dll", SetLastError = false)]
-		public static extern IntPtr HeapAlloc(IntPtr hHeap, uint dwFlags, int dwBytes);
-
-		/// <remarks>used in <c>#if false</c> code in <c>AviWriter.CodecToken.DeallocateAVICOMPRESSOPTIONS</c>, don't delete it</remarks>
-		[DllImport("kernel32.dll", SetLastError = true)]
-		public static extern bool HeapFree(IntPtr hHeap, uint dwFlags, IntPtr lpMem);
-
-		[DllImport("user32")]
-		public static extern bool HideCaret(IntPtr hWnd);
-
-		[DllImport("kernel32.dll")]
-		public static extern bool IsDebuggerPresent();
-
 		[DllImport("user32.dll", CharSet = CharSet.Auto)]
 		public static extern uint MapVirtualKey(uint uCode, uint uMapType);
 
-		[DllImport("msvcrt.dll", EntryPoint = "memset", CallingConvention = CallingConvention.Cdecl, SetLastError = false)]
-		public static extern IntPtr MemSet(IntPtr dest, int c, uint count);
-
 		[DllImport("shlwapi.dll", CharSet = CharSet.Auto)]
 		public static extern bool PathRelativePathTo([Out] StringBuilder pszPath, [In] string pszFrom, [In] FileAttributes dwAttrFrom, [In] string pszTo, [In] FileAttributes dwAttrTo);
 
-		[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
-		[return: MarshalAs(UnmanagedType.Bool)]
-		public static extern bool PeekMessage(out MSG lpMsg, IntPtr hWnd, uint wMsgFilterMin, uint wMsgFilterMax, uint wRemoveMsg);
-
-		[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
-		public static extern IntPtr PostMessage(IntPtr hWnd, uint msg, IntPtr wParam, IntPtr lParam);
-
-		[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
-		public static extern IntPtr RegisterClass([In] ref WNDCLASS lpWndClass);
-
-		[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
-		public static extern IntPtr SendMessage(IntPtr hWnd, uint msg, IntPtr wParam, ref HDITEM lParam);
-
-		[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
-		public static extern IntPtr SendMessage(IntPtr hWnd, uint msg, IntPtr wParam, IntPtr lParam);
-
-		[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
-		public static extern IntPtr SetWindowLongPtr(IntPtr hWnd, int nIndex, IntPtr dwNewLong);
-
-		[DllImport("shell32.dll", CharSet = CharSet.Auto)]
-		public static extern IntPtr SHBrowseForFolder(ref BROWSEINFO bi);
-
-		[DllImport("shell32.dll")]
-		public static extern int SHGetMalloc(out IMalloc ppMalloc);
-
-		[DllImport("shell32.dll")]
-		public static extern int SHGetPathFromIDList(IntPtr pidl, StringBuilder Path);
-
-		[DllImport("shell32.dll")]
-		public static extern int SHGetSpecialFolderLocation(IntPtr hwndOwner, int nFolder, out IntPtr ppidl);
-
 		[DllImport("user32.dll", CharSet = CharSet.Auto)]
 		public static extern bool SystemParametersInfo(int uAction, int uParam, ref int lpvParam, int flags);
 
-		[DllImport("winmm.dll", EntryPoint = "timeBeginPeriod")]
+		[DllImport("winmm.dll")]
 		public static extern uint timeBeginPeriod(uint uMilliseconds);
-
-		[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
-		[return: MarshalAs(UnmanagedType.Bool)]
-		public static extern bool TranslateMessage([In] ref MSG lpMsg);
 	}
 }

src/BizHawk.Common/Win32/Win32ShellContextMenu.cs

@@ -2,6 +2,9 @@
 using System.Runtime.InteropServices;
 using System.Text;
 
+// ReSharper disable FieldCanBeMadeReadOnly.Global
+// ReSharper disable UnusedMember.Global
+
 namespace BizHawk.Common
 {
 	public class Win32ShellContextMenu
@@ -117,6 +120,7 @@ namespace BizHawk.Common
 			}
 		}
 
+#pragma warning disable CA1069
 		[Flags]
 		public enum TPM
 		{
@@ -140,6 +144,7 @@ namespace BizHawk.Common
 			TPM_NOANIMATION = 0x4000,
 			TPM_LAYOUTRTL = 0x8000,
 		}
+#pragma warning restore CA1069
 
 		[Flags]
 		public enum CMF : uint

src/BizHawk.Common/Win32/WmImports.cs

@@ -0,0 +1,90 @@
+#nullable disable
+
+using System;
+using System.Runtime.InteropServices;
+
+// ReSharper disable FieldCanBeMadeReadOnly.Global
+
+namespace BizHawk.Common
+{
+	public static class WmImports
+	{
+		public const uint PM_REMOVE = 0x0001U;
+		public static readonly IntPtr HWND_MESSAGE = new(-3);
+		public const int GWLP_USERDATA = -21;
+
+		[StructLayout(LayoutKind.Sequential)]
+		public struct MSG
+		{
+			public IntPtr hwnd;
+			public uint message;
+			public IntPtr wParam;
+			public IntPtr lParam;
+			public uint time;
+			public int x;
+			public int y;
+		}
+
+		[UnmanagedFunctionPointer(CallingConvention.Winapi)]
+		public delegate IntPtr WNDPROC(IntPtr hWnd, uint uMsg, IntPtr wParam, IntPtr lParam);
+
+		[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
+		public struct WNDCLASS
+		{
+			public uint style;
+			public WNDPROC lpfnWndProc;
+			public int cbClsExtra;
+			public int cbWndExtra;
+			public IntPtr hInstance;
+			public IntPtr hIcon;
+			public IntPtr hCursor;
+			public IntPtr hbrBackground;
+			public string lpszMenuName;
+			public string lpszClassName;
+		}
+
+		[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
+		public static extern IntPtr CreateWindowEx(int dwExStyle, IntPtr lpClassName, string lpWindowName,
+			int dwStyle, int X, int Y, int nWidth, int nHeight, IntPtr hWndParent, IntPtr hMenu, IntPtr hInstance, IntPtr lpParam);
+
+		[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
+		public static extern IntPtr DefWindowProc(IntPtr hWnd, uint uMsg, IntPtr wParam, IntPtr lParam);
+
+		[DllImport("user32.dll", SetLastError = true)]
+		[return: MarshalAs(UnmanagedType.Bool)]
+		public static extern bool DestroyWindow(IntPtr hWnd);
+
+		[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
+		public static extern IntPtr DispatchMessage([In] ref MSG lpMsg);
+
+		[DllImport("user32.dll")]
+		public static extern IntPtr GetActiveWindow();
+
+		[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
+		public static extern IntPtr GetWindowLongPtr(IntPtr hWnd, int nIndex);
+
+		[DllImport("user32.dll")]
+		[return: MarshalAs(UnmanagedType.Bool)]
+		public static extern bool HideCaret(IntPtr hWnd);
+
+		[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
+		[return: MarshalAs(UnmanagedType.Bool)]
+		public static extern bool PeekMessage(out MSG lpMsg, IntPtr hWnd, uint wMsgFilterMin, uint wMsgFilterMax, uint wRemoveMsg);
+
+		[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
+		public static extern IntPtr PostMessage(IntPtr hWnd, uint msg, IntPtr wParam, IntPtr lParam);
+
+		[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
+		public static extern IntPtr RegisterClass([In] ref WNDCLASS lpWndClass);
+
+		[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
+		public static extern IntPtr SendMessage(IntPtr hWnd, uint msg, IntPtr wParam, IntPtr lParam);
+
+		[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
+		public static extern IntPtr SetWindowLongPtr(IntPtr hWnd, int nIndex, IntPtr dwNewLong);
+
+		[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
+		[return: MarshalAs(UnmanagedType.Bool)]
+		public static extern bool TranslateMessage([In] ref MSG lpMsg);
+	}
+}

src/BizHawk.Emulation.Cores/Consoles/Nintendo/N64/NativeApi/mupen64plusCoreApi.cs

@@ -785,10 +785,10 @@ namespace BizHawk.Emulation.Cores.Nintendo.N64.NativeApi
 		{
 			IntPtr[] waitHandles = { handle.SafeWaitHandle.DangerousGetHandle() };
 			const uint count = 1;
-			var QS_MASK = ThreadHacks.QS_ALLINPUT; // message queue status
+			var QS_MASK = WmImports.QS_ALLINPUT; // message queue status
 			QS_MASK = 0; //bizhawk edit?? did we need any messages here?? apparently not???
 			uint nativeResult;
-			ThreadHacks.MSG msg;
+			WmImports.MSG msg;
 			while (true)
 			{
 				// MsgWaitForMultipleObjectsEx with MWMO_INPUTAVAILABLE returns,
@@ -796,10 +796,10 @@ namespace BizHawk.Emulation.Cores.Nintendo.N64.NativeApi
 				nativeResult = ThreadHacks.MsgWaitForMultipleObjectsEx(count, waitHandles, 0xFFFFFFFF, QS_MASK, ThreadHacks.MWMO_INPUTAVAILABLE);
 				if (IsNativeWaitSuccessful(count, nativeResult, out int managedResult) || WaitHandle.WaitTimeout == managedResult) break;
 				// there is a message, pump and dispatch it
-				if (ThreadHacks.PeekMessage(out msg, IntPtr.Zero, 0, 0, ThreadHacks.PM_REMOVE))
+				if (WmImports.PeekMessage(out msg, IntPtr.Zero, 0, 0, WmImports.PM_REMOVE))
 				{
-					ThreadHacks.TranslateMessage(ref msg);
+					WmImports.TranslateMessage(ref msg);
-					ThreadHacks.DispatchMessage(ref msg);
+					WmImports.DispatchMessage(ref msg);
 				}
 			}
 //			handle.WaitOne();