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[Windows platform only]
Is sent only while printing, exactly before printing a new page and immediately after VPE_PRINT_NEWPAGE has been sent. The only use for this event is to call VpeDevSendData() in response.
VpeDevSendData() enables your application to send escape sequences to the printing device. So it is possible to select for example an output paper bin by code (or whatever other functionality is provided by the connected printer).
VPE_PRINT_DEVDATA
WPARAM wParam
LPARAM lParam
Parameters:
wParam
current page number that will be printed
lParam
contains the document-handle, so you can determine which document has sent the message
Remarks:
Your application should return PRINT_ACTION_OK (zero) if it processes this message without calling VpeDevSendData(). If it called VpeDevSendData(), your application must return PRINT_ACTION_CHANGE ( = 1).