private IntPtr WndProc(IntPtr rawHwnd, uint msg, IntPtr wParam, IntPtr lParam)
{
//WM_CREATE must always succeed
var hwnd = new User32.HWND(rawHwnd);
if (msg == (uint)User32.WM.CREATE || msg == (uint)User32.WM.NCCREATE)
{
return(User32.DefWindowProc(hwnd, msg, wParam, lParam));
}
IntPtr?ret = _wndProc(hwnd, msg, wParam, lParam);
if (ret.HasValue)
{
return(ret.Value);
}
return(User32.DefWindowProc(hwnd, msg, wParam, lParam));
}
public MessageWindow(string name, WndProcNullableRet wndProc)
{
if (string.IsNullOrEmpty(name))
{
throw new Exception("class_name is empty or null");
}
if (wndProc == null)
{
throw new ArgumentNullException("wndProc");
}
_name = name;
_wndProc = wndProc;
//Log.General.Debug("MessageWindow() name: " + name);
_hInstance = Marshal.GetHINSTANCE(GetType()
.Module);
if (_hInstance == new IntPtr(-1))
{
throw new Win32Exception("Couldn't get modules instance");
}
int UniqueID = 1;
_className = _name + " class " + UniqueID;
if (_className.Length > 255)
{
throw new ArgumentException("class name too long");
}
//Log.General.Debug("MessageWindow.Create classname: " + _className);
_internalWndProc = WndProc;
_wndClassEx = new User32.WNDCLASSEX
{
cbSize = (uint)Marshal.SizeOf(typeof(User32.WNDCLASSEX)),
style =
User32.CS.OWNDC | User32.CS.HREDRAW |
User32.CS.VREDRAW,
lpfnWndProc = _internalWndProc,
cbClsExtra = 0,
cbWndExtra = 0,
hInstance = _hInstance,
hIcon = IntPtr.Zero,
hCursor = IntPtr.Zero,
hbrBackground = IntPtr.Zero,
lpszMenuName = null,
lpszClassName = _className,
hIconSm = IntPtr.Zero
};
_classAtom = User32.RegisterClassEx(ref _wndClassEx);
if (_classAtom.IsInvalid)
{
throw new Win32Exception("Could not register window class");
}
_windowName = _name + " wnd " + UniqueID;
//Log.General.Debug("MessageWindow.Create windowname: " + _windowName);
// Create window
_handle =
User32.StrongHWND.CreateWindowEx(
User32.WindowStylesEx.WS_EX_CLIENTEDGE | User32.WindowStylesEx.WS_EX_APPWINDOW,
_className,
_windowName,
User32.WindowStyles.WS_OVERLAPPEDWINDOW,
// position
0,
0,
// size
0,
0,
// no parent
User32.HWND.NULL,
// no menu
IntPtr.Zero,
_hInstance,
IntPtr.Zero);
if (Handle.IsInvalid)
{
throw new Win32Exception("Could not create window");
}
}
public static extern IntPtr DefWindowProc(User32.HWND hWnd, uint msg, IntPtr wParam, IntPtr lParam);
