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