WindowProc typedef Null safety

IntPtr WindowProc(
  1. IntPtr hwnd,
  2. Int32 uMsg,
  3. IntPtr wParam,
  4. IntPtr lParam
)

Application-defined callback function that processes messages sent to a window.

Implementation

typedef WindowProc = IntPtr Function(
    IntPtr hwnd, Int32 uMsg, IntPtr wParam, IntPtr lParam);