Contains information required by the platformPrint field of the NPEmbedPrint during embedded mode printing.
Always contains NP_PRINT. Pointer to file to which the plug-in should write its Postscript data.
Callback structures are used to pass platform-specific information. The NPPrintCallbackStruct structure contains the file pointer to which the plug-in should write its Postscript data. This information is required by the platformPrint field of the NPEmbedPrint structure during embedded mode printing.
At the time the plug-in is called, the browser has already opened the file and written Postscript for other parts of the page. When the plug-in is done, it should leave the file open, as the browser can continue to write additional Postscript data to the file.