XpCancelPage cancels an in-progress print page. If the job was started with
output_mode XPGetData then the data stream to XpGetDocumentData is interrupted;
further data for the current page is generated but data for subsequent pages can
be generated. For many page description languages, such arbitrary interruptions
may invalidate the output.
If the job was started with output_mode XPSpool then depending on the driver and
spooler implementation the
entire page may be canceled or a partial page may be generated.
discard is True all XPPrintNotify events with a detail field of XPEndPageNotify
are discarded before XpCancelPage returns.
For clients selecting XPPrintMask (see XpSelectInput), the event XPPrintNotify
generated with its detail field set to XPEndPageNotify when the X Print Server