Inside Macintosh: QuickDraw GX Printing Extensions and Drivers /

Chapter 4 - Printing Messages / Printing Messages Reference

Printing Messages / Compatibility Messages

GXPrGeneral

QuickDraw GX sends the GXPrGeneral message when an application that supports the Macintosh Printing Manager calls the PrGeneral function. You can override the GXPrGeneral message to customize the handling of the PrGeneral function. Your override of the GXPrGeneral message must match the following formal declaration:

OSErr MyPrGeneral (Ptr aPtr);

aPtr

A pointer to the data block used by GXPrGeneral.

function result

An error code. The value noErr indicates that the operation was successful.

DESCRIPTION

The default implementation of this message uses the customization ('cust') resource to find the supported resolution for the printer. It also uses any available resolution ('resl') resources. You can override this message if you need to add any special handling to the processing of GXPrGeneral calls by your printer driver.

SPECIAL CONSIDERATIONS

You never send the GXPrGeneral message yourself.

You almost always forward the GXPrGeneral message so that the default implementation can perform its operations.

RESULT CODES

gxSegmentLoadFailedErr	A required code segment could not be found, or there was not enough memory to load it.
gxPrUserAbortErr	The user has canceled printing.

SEE ALSO

The PrGeneral function is described in Inside Macintosh: Imaging With QuickDraw.

The customization and resolution resources are described in the chapter "Printing Resources" in this book.

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