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Registering window class missing!

ToniAz (351)
Hello everyone!

I came accross the following piece of code. Body removed due to readability.


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BOOL CALLBACK DlgProc(HWND hwnd, UINT Message, WPARAM wParam, LPARAM lParam)
{
	switch(Message)
	{
		case WM_INITDIALOG:
		SetDlgItemText(hwnd, IDC_TEXT, "This is a string");
		SetDlgItemInt(hwnd, IDC_NUMBER, 5, FALSE);

		break;
		case WM_COMMAND:
			switch(LOWORD(wParam))
					
                 
                // wondering why I went with cpp rather than vb here
                
                

		break;
		default:
			return FALSE;
	}
	return TRUE;
}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
	LPSTR lpCmdLine, int nCmdShow)
{
	return DialogBox(hInstance, MAKEINTRESOURCE(IDD_MAIN), NULL, DlgProc);
}


Am I right that the following code is missing or am I the one missing something?


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WNDCLASSEX wc;
	HWND hwnd;
	MSG Msg;

	//Step 1: Registering the Window Class
	wc.cbSize		 = sizeof(WNDCLASSEX);
	wc.style		 = 0;
	wc.lpfnWndProc	 = WndProc;
	wc.cbClsExtra	 = 0;
	wc.cbWndExtra	 = 0;
	wc.hInstance	 = hInstance;
	wc.hIcon		 = LoadIcon(NULL, IDI_APPLICATION);
	wc.hCursor		 = LoadCursor(NULL, IDC_ARROW);
	wc.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
	wc.lpszMenuName  = NULL;
	wc.lpszClassName = g_szClassName;
	wc.hIconSm		 = LoadIcon(NULL, IDI_APPLICATION);

	if(!RegisterClassEx(&wc))
	{
		MessageBox(NULL, "Window Registration Failed!", "Error!",
			MB_ICONEXCLAMATION | MB_OK);
		return 0;
	}

	// Step 2: Creating the Window
	hwnd = CreateWindowEx(
		WS_EX_CLIENTEDGE,
		g_szClassName,
		"The title of my window",
		WS_OVERLAPPEDWINDOW,
		CW_USEDEFAULT, CW_USEDEFAULT, 240, 120,
		NULL, NULL, hInstance, NULL);

	if(hwnd == NULL)
	{
		MessageBox(NULL, "Window Creation Failed!", "Error!",
			MB_ICONEXCLAMATION | MB_OK);
		return 0;
	}

	ShowWindow(hwnd, nCmdShow);
	UpdateWindow(hwnd);

	// Step 3: The Message Loop
	while(GetMessage(&Msg, NULL, 0, 0) > 0)
	{
		TranslateMessage(&Msg);
		DispatchMessage(&Msg);
	}
	return Msg.wParam;
Last edited on
webJose (2948)
You are missing the fact that dialog boxes created using the DialogBox() function provide their own class name (The name is #32770 if I recall properly) and that it also pumps the messages.

So what you see there is a Windows GUI application that shows one dialog box created from a dialog box resource.
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