Looping Through a Job's Paper Types(IM:XP)

Inside Macintosh: QuickDraw GX Printing /

Chapter 4 - Advanced Printing Features / Advanced Printing Features Reference

Looping Through a Job's Paper Types
The application-defined function called by the GXForEachJobPaperTypeDo function takes two parameters: the view device object associated with a particular printer object, and a pointer to a reference constant in which you specify data passed into the application-defined function. For example, this is how you should declare the application-function if you were to name it MyPaperTypeFunction:
gxLoopStatus MyPaperTypeFunction(gxPaperType aPaperType, 
                                 void *refCon);
aPaperType

A reference to the current paper type. This is provided by QuickDraw GX when the MyPaperTypeFunction function is called.
refCon
A pointer to a reference constant.

function result
A Boolean to indicate whether looping should stop.

DESCRIPTION
When you use the GXForEachJobPaperTypeDo function, QuickDraw GX calls the application-defined function for each paper-type object referenced by the specified job object until the application-defined function returns gxStopLooping or there are no more paper types in the list. If you want the GXForEachJobPaperTypeDo function to continue with the next paper type, return gxKeepLooping from the application-defined function.