Spooling Messages
When an application sends shapes to be printed, QuickDraw GX uses spooling messages to send these shapes to spool files. It sends these messages when the application is calling QuickDraw GX functions to accomplish printing-related tasks. You can override spooling messages to change the data as it is being written to disk.Some printing extensions and printer drivers need to perform their own spooling or create a custom format for the spool file. If this is the case for your extension or driver, you need to override all of the spooling and despooling messages.
When you override a spooling message, you need to choose whether to forward the message to the other handlers in the message chain. If you are performing your own spooling and overriding all of the spooling and despooling messages, you don't need to forward the messages. However, if you are not handling all of the spooling yourself, you do need to forward each message so that the default implementation can perform its task.
Subtopics
- GXCreateSpoolFile
- GXSpoolPage
- GXSpoolData
- GXSpoolResource
- GXCompleteSpoolFile
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