WM_PRINT

The WM_PRINT message is sent to a window to request that it draw itself in the specified device context, most commonly in a printer device context.

WM_PRINT

hdc = (HDC) wParam;

uFlags = lParam;

Parameters

hdc

Identifies the device context to draw in.

uFlags

Specifies the drawing options. This parameter can be one or more of these flags:

Value	Meaning
PRF_CHECKVISIBLE	Draw the window only if it is visible.
PRF_CHILDREN	Draw all visible children windows.
PRF_CLIENT	Draw the client area of the window.
PRF_ERASEBKGND	Erase the background before drawing the window.
PRF_NONCLIENT	Draw the nonclient area of the window.
PRF_OWNED	Draw all owned windows.

Remarks

The DefWindowProc function processes this message based on which drawing option is specified: if PRF_CHECKVISIBLE is specified and the window is not visible, do nothing, if PRF_NONCLIENT is specified, draw the nonclient area in the given device context, if PRF_ERASEBKGND is specified, send the window a WM_ERASEBKGND message, if PRF_PRINTCLIENT is specified, send the window a WM_PRINTCLIENT message, if PRF_PRINTCHILDREN is set, send each visible child window a WM_PRINT message, if PRF_OWNED is set, send each visible owned window a WM_PRINT message.

See Also

DefWindowProc, WM_ERASEBKGND, WM_PRINTCLIENT

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