// check this post - http://stackoverflow.com/questions/1969049/c-sharp-p-invoke-marshalling-structures-containing-function-pointers
//
static IntPtr MainWndProc(IntPtr hWnd, uint msg, IntPtr wParam, IntPtr lParam)
{
IntPtr hdc;
PAINTSTRUCT ps;
RECT rect;
//switch ((WM) message)
//{
// WinAPI.BeginPaint(hWnd, out ps);
// break;
//}
switch ((WM)msg)
{
case WM.PAINT:
hdc = WinAPI.BeginPaint(hWnd, out ps);
WinAPI.GetClientRect(hWnd, out rect);
WinAPI.DrawText(hdc, "Hello, Windows 98!", -1, ref rect, Win32_DT_Constant.DT_SINGLELINE | Win32_DT_Constant.DT_CENTER | Win32_DT_Constant.DT_VCENTER);
WinAPI.EndPaint(hWnd, ref ps);
return(IntPtr.Zero);
break;
case WM.DESTROY:
WinAPI.PostQuitMessage(0);
return(IntPtr.Zero);
break;
}
return(WinAPI.DefWindowProc(hWnd, (WM)msg, wParam, lParam));
}