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SetInterrupt (csCode = 7)

The optional SetInterrupt routine controls the generation of VBL interrupts.



 
OSErr = Control(theDeviceRefNum, cscSetInterrupt, &theVDFlag Record );

--> csMode: Enable or disable interrupts
-- filler: Unused

To enable interrupts, pass a csMode value of 0; to disable interrupts, pass a csMode value of 1. The VDFlagRecord data structure is defined in Replacing Graphics Drivers.