Correction/addendum: I wrote: > try to to > be to upset when you find out how your three days were wasted...
Of course that's, "try not to be too upset..." [...] > You're probably familiar with the Python > convention of special member names with double-underscores at each > end? Well, ctypes doesn't follow it. The double-ended-double-underscore convention is for names defined by the Python language. As a library module, ctypes is technically right not to use it. It's still a diabolical gotcha. [...] > If you spell _fields_ as ctypes > requires, it will complain about your assignments, in that you are > trying to assign an in to a union. Obviously a typo, for "trying to assign an int to a union." Come to think of it, I bet initially Peter West had that bit right. Because of the _fields_ issue, the correct assignment failed: FrameFormat.XUnion.subSample = 0 Without _fields_, ctypes did not create a FrameFormat.XUnion member, so the assignment fails with "AttributeError: 'LUCAM_FRAME_FORMAT' object has no attribute 'XUnion'". -- --Bryan Olson -- http://mail.python.org/mailman/listinfo/python-list
