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.
DefWindowProc, WM_ERASEBKGND, WM_PRINTCLIENT
file: /Techref/os/win/api/win32/mess/src/msg27.htm, 3KB, , updated: 2000/4/7 12:20, local time: 2024/8/19 12:23,
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