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copied!<p>Are any of the parameters in add-controller or add-tuner actually return values?</p> <p>Strongly recommend that you define prototypes of your functions, rather than calling them direct with casts of all the parameters.</p> <p><a href="http://docs.python.org/library/ctypes.html" rel="nofollow noreferrer">I'm sure you've read this page already</a>, but the section you want to look at is Function Prototypes. Makes the code much cleaner and easier to trace/debug.</p> <p>Also -- as Mark Rushakoff mentions too -- using pointer(c_double()) and like in your call is pretty icky. I have much better luck w/ POINTER(), and recommend again that you predeclare the value as a variable, and pass the variable in your function call. Then at least you can examine its value afterward for strange behavior.</p> <p>EDIT: So your prototype and call will look something like this:</p> <pre><code>prototype = WINFUNCTYPE( c_int, # Return value (correct? Guess) c_short, # tuner_number c_char_p, # file_path c_char_p, # name c_int, # 0? c_int, # 0? c_long, # 0? c_short, # serial_number c_char_p, # error_string ) # 1 input, 2 output, 4 input default to zero (I think; check doc page) paramflags = (1, 'TunerNumber' ), (1, 'FilePath' ), (1, 'Name' ), ... AddController = prototype(('add_controller', WinDLL.MlibTuners), paramflags) </code></pre> <p>Then your call is much cleaner:</p> <pre><code>arg1 = 0 arg2 = 0 arg3 = 0 AddController(tuner_number, self.file_path, name, arg1, arg2, arg3, serial_number, self.error_string) </code></pre>

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