add InstanceDll

BizHawk.Common/BizHawk.Common.csproj

@@ -63,6 +63,7 @@
     <Compile Include="Extensions\ReflectionExtensions.cs" />
     <Compile Include="Extensions\StringExtensions.cs" />
     <Compile Include="HawkFile.cs" />
+    <Compile Include="InstanceDll.cs" />
     <Compile Include="IPC\IPCRingBuffer.cs" />
     <Compile Include="IPC\SharedMemoryBlock.cs" />
     <Compile Include="Log.cs" />

BizHawk.Common/InstanceDll.cs

@@ -0,0 +1,47 @@
+using System;
+using System.IO;
+using System.Runtime.InteropServices;
+
+namespace BizHawk.Common
+{
+	public class InstanceDll : IDisposable
+	{
+		public InstanceDll(string dllPath)
+		{
+			//copy the dll to a temp directory
+			var path = Path.Combine(Path.GetTempPath(), "instancedll-pid" + System.Diagnostics.Process.GetCurrentProcess().Id + "-" + Guid.NewGuid()) + "-" + Path.GetFileName(dllPath);
+			using (var stream = new FileStream(path, FileMode.Create, System.Security.AccessControl.FileSystemRights.FullControl, FileShare.ReadWrite | FileShare.Delete, 4 * 1024, FileOptions.None))
+			using (var sdll = File.OpenRead(dllPath))
+				sdll.CopyTo(stream);
+
+			_hModule = LoadLibrary(path);
+			var newfname = Path.GetFileName(path);
+			newfname = "bizhawk.bizdelete-" + newfname;
+			var newpath = Path.Combine(Path.GetDirectoryName(path), newfname);
+			File.Move(path, newpath);
+		}
+
+		[DllImport("kernel32.dll")]
+		static extern IntPtr LoadLibrary(string dllToLoad);
+		[DllImport("kernel32.dll")]
+		static extern IntPtr GetProcAddress(IntPtr hModule, string procedureName);
+		[DllImport("kernel32.dll")]
+		static extern bool FreeLibrary(IntPtr hModule);
+
+		public IntPtr GetProcAddress(string procName)
+		{
+			return GetProcAddress(_hModule, procName);
+		}
+
+		public void Dispose()
+		{
+			if (_hModule != IntPtr.Zero)
+			{
+				FreeLibrary(_hModule);
+				_hModule = IntPtr.Zero;
+			}
+		}
+
+		IntPtr _hModule;
+	}
+}