private static int WndProc(IntPtr hwnd, uint msg, IntPtr wparam, IntPtr lparam)
{
switch (msg)
{
case CreateWindowMessage:
lock (_crossThreadWindowLock)
{
_tempHandle = CreateWindow();
Monitor.Pulse(_crossThreadWindowLock);
}
break;
case (uint)WindowMessage.Destroy:
break;
default:
MessageListener listener;
if (_listeners.TryGetValue(hwnd, out listener))
{
Message message = new Message(hwnd, msg, wparam, lparam, 0, new NativePoint());
listener.MessageReceived.SafeRaise(listener, new WindowMessageEventArgs(message));
}
break;
}
return(ShellObjectWatcherNativeMethods.DefWindowProc(hwnd, msg, wparam, lparam));
}
private static IntPtr CreateWindow() => ShellObjectWatcherNativeMethods.CreateWindowEx(
0, //extended style
MessageWindowClassName, //class name
"MessageListenerWindow", //title
0, //style
0, 0, 0, 0, // x,y,width,height
new IntPtr(-3), // -3 = Message-Only window
IntPtr.Zero, IntPtr.Zero, IntPtr.Zero);
private static void RegisterWindowClass()
{
WindowClassEx classEx = new WindowClassEx();
classEx.ClassName = MessageWindowClassName;
classEx.WndProc = wndProc;
classEx.Size = (uint)Marshal.SizeOf(typeof(WindowClassEx));
var atom = ShellObjectWatcherNativeMethods.RegisterClassEx(ref classEx);
if (atom == 0)
{
throw new ShellException(LocalizedMessages.MessageListenerClassNotRegistered,
Marshal.GetExceptionForHR(Marshal.GetHRForLastWin32Error()));
}
_atom = atom;
}
private void ThreadMethod() // Message Loop
{
lock (_crossThreadWindowLock) {
_running = true;
if (_atom == 0)
{
RegisterWindowClass();
}
WindowHandle = CreateWindow();
Monitor.Pulse(_crossThreadWindowLock);
}
while (_running)
{
Message msg;
if (ShellObjectWatcherNativeMethods.GetMessage(out msg, IntPtr.Zero, 0, 0))
{
ShellObjectWatcherNativeMethods.DispatchMessage(ref msg);
}
}
}
