RE: [Dev-C++] Problem with RegisterWindowMessage()

[Jaap de W. <wo...@Ne...>]

You can't use switch on a value which is not known at compile time.
instead, do a compare in default:
	default:
		if (message == WM_MYMESSAGE)
		{
			/* Do some stuff */		
		}
		else
		{
			return DefWindowProc (hwnd, message, wParam,
lParam);
		}

The other part of the story is that you shouldn't assign the value of a
variable in the header file, but do this in the implementation file.

> -----Original Message-----
> From: Marc Heiligers [mailto:ma...@e-...]
> Sent: Monday, December 02, 2002 02:32 PM
> To: dev-cpp-users-list
> Subject: [Dev-C++] Problem with RegisterWindowMessage()
> 
> 
> I have a little problem. I have a header file which I include 
> in my main
> file (surprise surprise). In the header I have the following:
> 
> const UINT WM_MYMESSAGE = RegisterWindowMessage(_T("some message"));
> 
> Right, now in my main WindowProc I have a switch statement like so:
> 
> LRESULT CALLBACK WindowProc(HWND hwnd, UINT message, WPARAM 
> wParam, LPARAM
> lParam)
> {
>     switch (message)                  /* handle the messages */
>     {
>       case WM_DESTROY:
>             PostQuitMessage (0);       /* send a WM_QUIT to 
> the message
> queue */
>             break;
> 	/* 
> 		And some more message handlers here
> 		more
> 		more
> 	*/
> 	case WM_MYMESSAGE:
> 		/*Do some stuff*/
> 	default:
> 		return DefWindowProc (hwnd, message, wParam, lParam);
>     }
>     return 0;
> }
> 
> So far so good. Now when I compile I get the following little message:
> 
> "case label `WM_MYMESSAGE' does not reduce to an integer constant"
> 
> Now, personally, I thought that a "const UINT" was an integer 
> constant, but
> clearly g++ disagrees. The funny thing is I have used similar 
> code with VC++
> v6 and not had the same problem. Any ideas of how I can 
> convince g++ that
> this is the case would be appreciated.
> 
> _____________________________
> Marc Heiligers
> 
> PS. I've had coffee before I wrote this, so I'm pretty sure 
> I'm thinking
> straight (for a change).
> 
> 
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