WiimoteScannerDarwin: Initialize IOBluetoothHostController in constructor

Source/Core/Core/HW/WiimoteReal/IOdarwin.h

@@ -7,17 +7,25 @@
 #ifdef __APPLE__
 #include "Core/HW/WiimoteReal/WiimoteReal.h"
 
+#ifdef __OBJC__
+#import <IOBluetooth/IOBluetooth.h>
+#else
+// IOBluetooth's types won't be defined in pure C++ mode.
+typedef void IOBluetoothHostController;
+#endif
+
 namespace WiimoteReal
 {
 class WiimoteScannerDarwin final : public WiimoteScannerBackend
 {
 public:
-  WiimoteScannerDarwin() = default;
+  WiimoteScannerDarwin();
   ~WiimoteScannerDarwin() override;
   bool IsReady() const override;
   void FindWiimotes(std::vector<Wiimote*>&, Wiimote*&) override;
   void Update() override {}  // not needed
 private:
+  IOBluetoothHostController* m_host_controller;
   bool m_stop_scanning = false;
 };
 }  // namespace WiimoteReal

Source/Core/Core/HW/WiimoteReal/IOdarwin.mm

@@ -21,27 +21,40 @@
 
 namespace WiimoteReal
 {
+WiimoteScannerDarwin::WiimoteScannerDarwin()
+{
+  m_host_controller = [IOBluetoothHostController defaultController];
+  if (![m_host_controller addressAsString])
+  {
+    WARN_LOG_FMT(WIIMOTE, "No Bluetooth host controller");
+    
+    [m_host_controller release];
+    m_host_controller = nil;
+    
+    return;
+  }
+  
+  [m_host_controller retain];
+}
+
 WiimoteScannerDarwin::~WiimoteScannerDarwin()
 {
+  [m_host_controller release];
+  m_host_controller = nil;
+  
   m_stop_scanning = true;
 }
 
 void WiimoteScannerDarwin::FindWiimotes(std::vector<Wiimote*>& found_wiimotes,
                                         Wiimote*& found_board)
 {
-  // TODO: find the device in the constructor and save it for later
-  IOBluetoothHostController* bth;
-  IOBluetoothDeviceInquiry* bti;
-  found_board = nullptr;
-
-  bth = [[IOBluetoothHostController alloc] init];
-  bool btFailed = [bth addressAsString] == nil;
-  if (btFailed)
+  if (!m_host_controller)
   {
-    WARN_LOG_FMT(WIIMOTE, "No Bluetooth host controller");
-    [bth release];
     return;
   }
+  
+  IOBluetoothDeviceInquiry* bti;
+  found_board = nullptr;
 
   SearchBT* sbt = [[SearchBT alloc] init];
   sbt->maxDevices = 32;
@@ -52,7 +65,6 @@ void WiimoteScannerDarwin::FindWiimotes(std::vector<Wiimote*>& found_wiimotes,
   if ([bti start] != kIOReturnSuccess)
   {
     ERROR_LOG_FMT(WIIMOTE, "Unable to do Bluetooth discovery");
-    [bth release];
     [sbt release];
     
     return;
@@ -86,16 +98,14 @@ void WiimoteScannerDarwin::FindWiimotes(std::vector<Wiimote*>& found_wiimotes,
       found_wiimotes.push_back(wm);
     }
   }
-
-  [bth release];
+  
   [bti release];
   [sbt release];
 }
 
 bool WiimoteScannerDarwin::IsReady() const
 {
-  // TODO: only return true when a BT device is present
-  return true;
+  return m_host_controller != nil;
 }
 
 WiimoteDarwin::WiimoteDarwin(IOBluetoothDevice* device) : m_btd(device)