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;
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. |
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.
Windows NT: Requires version 4.0 or later.
Windows: Requires Windows 95 or later.
Windows CE: Unsupported.
Header: Declared in winuser.h.
Painting and Drawing Overview, Painting and Drawing Messages, DefWindowProc, WM_ERASEBKGND, WM_PRINTCLIENT