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BeginPaint info  Overview  Group

The BeginPaint function prepares the specified window for painting and fills a PAINTSTRUCT structure with information about the painting.

HDC BeginPaint(

    HWND hwnd,

// handle to window

    LPPAINTSTRUCT lpPaint

// pointer to structure for paint information

   );

Parameters

hwnd
Identifies the window to be repainted.
lpPaint
Pointer to the PAINTSTRUCT structure that will receive painting information.

Return Values

If the function succeeds, the return value is the handle to a display device context for the specified window.

If the function fails, the return value is NULL, indicating that no display device context is available. To get extended error information, call GetLastError.

Remarks

The BeginPaint function automatically sets the clipping region of the device context to exclude any area outside the update region. The update region is set by the InvalidateRect or InvalidateRgn function and by the system after sizing, moving, creating, scrolling, or any other operation that affects the client area. If the update region is marked for erasing, BeginPaint sends a WM_ERASEBKGND message to the window.

An application should not call BeginPaint except in response to a WM_PAINT message. Each call to BeginPaint must have a corresponding call to the EndPaint function.

If the caret is in the area to be painted, BeginPaint automatically hides the caret to prevent it from being erased.

If the window’s class has a background brush, BeginPaint uses that brush to erase the background of the update region before returning.

See Also

EndPaint, InvalidateRect, InvalidateRgn, PAINTSTRUCT, ValidateRect, ValidateRgn


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