Debugging a NULL CGContext under Cocoa/Carbon
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18-09-2019 - |
Question
During the execution of my program I'm getting the following output in the XCode debugging console:
<Error>: CGContextSetTextMatrix: invalid context 0x0
I have no idea where in the application this NULL-context is being passed to the OS. Anyone know of a good technique to hunt it down? Can I break into the application when something is written to stdout
?
Solution
Adding a breakpoint in the gdb console for CGPostError
breaks when the OS writes a CG-related error to stderr
.
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