Re: [Dev-C++] WinAPP

Hi Noorez,

The problem is in your switch structure. Your callback function doesn't
return a value from WM_PAINT. Replace the break statement at the end of
your case with a "return 0" statement, and I think that might fix your
problem.

Also. note that the braces around the code in your WM_PAINT case are not
necessary. You don't need to use braces to group case statements as all of
hem will execute up until it encounters a break or return.

Try replacing "break" with "return 0;" and also removing the braces from
the WM_PAINT case. That might fix your problem.

On Wed, 24 Dec 2003, Noorez Kassam wrote:

> This WinApp closes too fast to see results
>
> #include <windows.h>
>
>
> LRESULT CALLBACK WindowProc(HWND hWnd, UINT uMsgId, WPARAM wParam, LPARAM
> lParam);
>
> int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR
> pszCmdLine, int nCmdShow)
> {
> 	static char szAppName[] = "hello";
> 	HWND hWnd;
> 	MSG msg;
> 	WNDCLASSEX wndClass;
>
> 	//register class
> 	wndClass.style = 0;
> 	wndClass.lpfnWndProc = WindowProc;
> 	wndClass. cbClsExtra = 0;
> 	wndClass.hInstance = hInstance;
> 	wndClass.hIcon = LoadIcon( hInstance, szAppName);
> 	wndClass.hCursor = LoadCursor(NULL, IDC_ARROW);
> 	wndClass.hbrBackground = (HBRUSH) COLOR_BACKGROUND;
> 	wndClass.lpszMenuName = NULL;
> 	wndClass.lpszClassName = szAppName;
> 	wndClass.hIconSm = wndClass.hIcon;
>
> 	if(RegisterClassEx(&wndClass)==0)//register class...
> 		return 0;  //quit if it doesn't work
>
> 	//now create window
> 	hWnd = CreateWindow(szAppName, szAppName, WS_OVERLAPPEDWINDOW,
> CW_USEDEFAULT, CW_USEDEFAULT,
> 		                 CW_USEDEFAULT, CW_USEDEFAULT, NULL, NULL, hInstance,
> NULL);
>
> 	if(hWnd == NULL)
> 		return 0;
>
> 	ShowWindow(hWnd, nCmdShow);
> 	UpdateWindow( hWnd );
>
> 	while( GetMessage(&msg, NULL, 0,0))
> 	{
> 		TranslateMessage(&msg);
> 		DispatchMessage(&msg);
> 	}
> 	return msg.wParam;
> }
>
>
> //process functions
> LRESULT CALLBACK WindowProc(HWND hWnd, UINT uMsgId, WPARAM wParam, LPARAM
> lParam)
> {
> 	static char *pszHello = "Hello, world";
>
> switch(uMsgId)
> 	{
> 	case WM_PAINT:
> 		{
> 			HDC hDC;
> 			PAINTSTRUCT paintStruct;
>
> 			hDC = BeginPaint( hWnd, &paintStruct);
>
> 			TextOut(hDC, 0,0, pszHello, lstrlen(pszHello));
>
> 			EndPaint( hWnd, &paintStruct );
> 		}
> 		break;
>
> 	case WM_DESTROY:
> 			PostQuitMessage(0);
>
> 			break;
>
> 	default:
> 		return DefWindowProc(hWnd,uMsgId,wParam,lParam);
> 	}
> 	return 0;
> }
>
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