/// <summary>
/// Performs tasks associated with freeing, releasing, or resetting unmanaged resources.
/// </summary>
public void Dispose()
{
UnregisterDeviceNotification(deviceNotificationHandle);
Application.RemoveMessageFilter(messageFilter);
nativeWindowWrap.Dispose();
nativeWindowWrap = null;
}
/// <summary>
/// Initializes an instance of Keyboards.
/// </summary>
/// <param name="handle">The handle of the receiver (form) which will process the caught messages.</param>
public Keyboards(IntPtr handle)
{
messageFilter = new MessageFilter();
Application.AddMessageFilter(messageFilter);
nativeWindowWrap = new NativeWindowWrap(handle, ProcessKey);
var broadcastDeviceInterface = new BroadcastDeviceInterface(multiKeyboardDeviceId);
var mem = IntPtr.Zero;
try
{
mem = Marshal.AllocHGlobal(sizeOfBroadcastDeviceInterface);
Marshal.StructureToPtr(broadcastDeviceInterface, mem, false);
deviceNotificationHandle = RegisterDeviceNotification(handle, mem, 0 /*DEVICE_NOTIFY_WINDOW_HANDLE*/);
}
finally
{
Marshal.FreeHGlobal(mem);
}
if (deviceNotificationHandle == IntPtr.Zero)
{
throw new InvalidOperationException(string.Format("Registration for device notifications Failed. Error: {0}", Marshal.GetLastWin32Error()));
}
}
