Ctypes in python, problem calling a function in a DLL?

I figure it's the value you pass at the long max_range argument. The function expects a pointer to a long integer there (it asks for an array of long integers), but you're passing a long value of zero (result of the c_long() call), which is implicitly cast to a null pointer. I suspect the function then tries to write to the address passed at max_range ie.

The null pointer, hence the access violation at address 0x00000000 .

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