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digitalmars.D.dtl - [WINAPI] Window in D

reply Daniel Wojdak <danielwojdak gmail.com> writes:
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?
Jan 01 2009
next sibling parent Mike Parker <aldacron gmail.com> writes:
Daniel Wojdak 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?
 

This should do the trick: extern(Windows) int WindowProcedure (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
Jan 01 2009
prev sibling parent "Denis Koroskin" <2korden gmail.com> writes:
On Thu, 01 Jan 2009 19:34:42 +0300, Daniel Wojdak <danielwojdak 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); }
Jan 02 2009