private void CreateFakeWnd()
{
var wndClsEx = new WNDCLASSEX();
wndClsEx.Init();
wndClsEx.style = WndClassType.CS_VREDRAW | WndClassType.CS_HREDRAW;
wndClsEx.lpfnWndProc = _defWndProcDelegate;
wndClsEx.cbClsExtra = 0;
wndClsEx.cbWndExtra = 0;
wndClsEx.hInstance = Kernel32.GetModuleHandle(null);
wndClsEx.hIcon = IntPtr.Zero;
wndClsEx.hIconSm = IntPtr.Zero;
wndClsEx.hCursor = IntPtr.Zero;
wndClsEx.hbrBackground = IntPtr.Zero;
wndClsEx.lpszClassName = _wndClassName;
wndClsEx.lpszMenuName = null;
bool success = User32.RegisterClassEx(ref wndClsEx) != 0;
Debug.Assert(success, "RegisterWndClass failed.");
var dwExStyle = ExtendedWndStyle.WS_EX_LAYERED | ExtendedWndStyle.WS_EX_TRANSPARENT
| ExtendedWndStyle.WS_EX_NOACTIVATE | ExtendedWndStyle.WS_EX_LEFT;
var dwStyle = WndStyle.WS_VISIBLE | WndStyle.WS_OVERLAPPED;
_fakeWindowHandle = User32.CreateWindowEx(dwExStyle, _wndClassName, null, dwStyle,
this.Left, this.Top, this.GetWidth(), this.GetHeight()
, this.Handle, IntPtr.Zero, Kernel32.GetModuleHandle(null), IntPtr.Zero);
Debug.Assert(User32.IsWindow(_fakeWindowHandle), "CreateWindowEx failed.");
}
public static extern short RegisterClassEx([In] ref WNDCLASSEX lpwcx);
