Application-Defined Function
Applications can provide a custom interrupt function in the
userInterruptProc
parameter of the
VDSetDigitizerUserInterrupt
function. Every custom interrupt function must support the following interface:
pascal void MyInterruptProc (long flags, long refcon);
-
flags
-
Indicates when the interrupt function has been called. The video digitizer component sets these flags to indicate the circumstances in which the function has been called. The following flags are defined:
-
Bit 0
-
Even-line field interrupt. If this flag is set to 1, the video digitizer component is about to display an even-line field.
-
Bit 1
-
Odd-line field interrupt. If this flag is set to 1, the video digitizer component is about to display an odd-line field.
-
refcon
-
Contains parameter data that is appropriate for the interrupt function. The application assigns the value of the reference constant when it sets the interrupt function.
© 1997 Apple Computer, Inc.Previous | Chapter Top | Chapter Contents
