Visual C++ and MFC Programming 2nd Edition

Visual C++ and MFC Fundamentals Chapter 12: Dialog-Based Windows

CreateWindow() or CreateWindowEx() functions. Otherwise, pass this argument as

NULL.

If you are creating an MFC application and want the main window to display a menu,

design the menu as you see fit and create its resource. Then pass the menu name as the

lpszMenuName argument of the Create() method. If you want to use the identifier of the

menu, pass its ID to the MAKEINTRESOURCE macro. This can be done as follows:

CMainFrame::CMainFrame()

{

// Declare a window class variable

WNDCLASS WndCls;

const char *StrWndName = "Windows Fundamentals";

WndCls.style = CS_VREDRAW | CS_HREDRAW;

WndCls.lpfnWndProc = AfxWndProc;

WndCls.cbClsExtra = 0;

WndCls.cbWndExtra = 0;

WndCls.hInstance = AfxGetInstanceHandle();

WndCls.hIcon = AfxGetApp()->LoadStandardIcon(IDI_WARNING);

WndCls.hCursor = AfxGetApp()->LoadStandardCursor(IDC_CROSS);

WndCls.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);

WndCls.hCursor = AfxGetApp()->LoadStandardCursor(IDC_CROSS);

WndCls.lpszMenuName = MAKEINTRESOURCE(IDR_MENU1);

const char *StrClass = AfxRegisterWndClass(WndCls.style, WndCls.hCursor,

WndCls.hbrBackground, WndCls.hIcon);

Create(StrClass, StrWndName, WS_OVERLAPPEDWINDOW, rectDefault,

NULL, MAKEINTRESOURCE(IDR_MENU1));

}

To make sure that the window was created, you can check its return value.

If the CreateWindow() or the CreateWindowEx() functions of a Win32 application

succeeds in creating the window, it returns a handle to the window that was created. You

can check this validity using an if conditional statement. Here is an example:

INT WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,

LPSTR lpCmdLine, int nCmdShow)

{

HWND hWnd;

WNDCLASS WndCls;

...

RegisterClass(&WndCls);

hWnd = CreateWindow(ClsName,

WndName,

WS_OVERLAPPEDWINDOW,

CW_USEDEFAULT,

CW_USEDEFAULT,

CW_USEDEFAULT,

CW_USEDEFAULT,

NULL,

NULL,

hInstance,