Inside Macintosh: QuickDraw GX Printing Extensions and Drivers /

Chapter 5 - Printing Functions for Message Overrides / Printing Functions Reference

Functions / Managing Paper Trays

GXCountTrays

You can use the GXCountTrays function to determine the number of paper trays that are available for your printing extension or printer driver to use.

OSErr GXCountTrays (gxTrayIndex *numTrays);

numTrays

A pointer to a value that, on return, contains the number of paper trays that are currently available on the printer.

function result

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

DESCRIPTION

The GXCountTrays function calls the GXFetchTaggedData function to retrieve
the number of paper trays that are currently available on the printer. You call the GXCountTrays function to determine how many trays there are when you need to loop through the paper trays to look for information.

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 GXFetchTaggedData function is described in Inside Macintosh: QuickDraw GX Environment and Utilities.

You can read about managing paper trays in the section "Managing Paper Trays and Their Paper Types" beginning on page 5-5.

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