[WINAPI] Window in D

[Denis Koroskin]

On Thu, 01 Jan 2009 19:34:42 +0300, Daniel Wojdak <danielwojdak at gmail.com> wrote:

> My english is not good. Apologize for this.
>
> I start programming in D and i have a problem.
> When I try make a window procedure and register class window. Compiler  
> show error:
> "Error: cannot implicitly convert expression (& WindowProcedure) of type  
> intWindows function(HANDLE, uint, uint, int) function(HANDLE hwnd, uint  
> message, uint wParam, int lParam) to intWindows function(HANDLE, uint,  
> uint, int)"
>
> Window Procedure:
>
> "WNDPROC WindowProcedure (HWND hwnd, UINT message, WPARAM wParam, LPARAM  
> lParam)
> {
>      switch (message)
>      {
>
>          case WM_DESTROY:
>              PostQuitMessage (0);
>              break;
>          default:
>              return cast(WNDPROC) DefWindowProcA (hwnd, message, wParam,  
> lParam);
>      }
>
>      return cast(WNDPROC) 0;
> }"
>
> How must look window procedure in order to it's work?
>

Ouch! What does this function return? Shouldn't typeof(return) be LRESULT?

extern(Windows):
LRESULT WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
 switch (message)
 {
     case WM_DESTROY:
         PostQuitMessage (0);
         break;
     default:
        break;
 }

 return DefWindowProcA (hwnd, message, wParam, lParam);
}