HelloApp - mfc samples

Minimal MFC sample that illustrates that few lines of code are required to get a window to appear on the screen.

2025-11-25

Written by: xiaobin

The default is to use CFrameWnd!

Create method

Create(NULL, _T("Hello World!"), WS_OVERLAPPEDWINDOW, rectDefault);

dwStyle
rect Specifies the size and position of the window. The rectDefault value allows Windows to specify the size and position of the new window.

CWnd

Use CreateEx() to customize special windows.

AfxRegisterWndClass

const char* AfxRegisterWndClass(UINT nClassStyle,
    HCURSOR hCursor,
    HBRUSH hbrBackground,
    HICON hIcon);

hbrBackground

COLOR_WINDOW+1 = COLOR_WINDOWFRAME

LoadCursor

lpCursorName

CreateEx method

        CreateEx(WS_EX_CLIENTEDGE,
            AfxRegisterWndClass(0, ::LoadCursor(NULL, IDC_ARROW), (HBRUSH)(COLOR_WINDOW+1)),
            _T("Hello-World!"), WS_OVERLAPPEDWINDOW,
            CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, NULL, NULL, 0);

CW_USEDEFAULT is valid only for overlapped windows; 
if it is specified for a pop-up or child window, the x and y parameters are set to zero.

Ref