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October 3, 2017 11:29
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Calling C from Python
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| libsum.so: sum.c | |
| cc -shared -o libsum.so sum.c |
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| int our_function(int num_numbers, int *numbers) { | |
| int sum = 0; | |
| for (int i = 0; i < num_numbers; i++) { | |
| sum += numbers[i]; | |
| } | |
| return sum; | |
| } |
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| import ctypes | |
| _sum = ctypes.CDLL('libsum.so') | |
| _sum.our_function.argtypes = (ctypes.c_int, ctypes.POINTER(ctypes.c_int)) | |
| def our_function(numbers): | |
| num_numbers = len(numbers) | |
| array_type = ctypes.c_int * num_numbers | |
| result = _sum.our_function(ctypes.c_int(num_numbers), array_type(*numbers)) | |
| return int(result) | |
| if __name__ == '__main__': | |
| print(our_function([1, 2, 3, -10])) |
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Based on https://pgi-jcns.fz-juelich.de/portal/pages/using-c-from-python.html.