If I have the follow 2 sets of code, how do I glue them together?
void c_function(void *ptr) { int i; for (i = 0; i < 10; i++) { printf("%p", ptr[i]); } return; } def python_routine(y): x = [] for e in y: x.append(e)
How can I call the c_function with a contiguous list of elements in x? I tried to cast x to a c_void_p, but that didn’t work.
I also tried to use something like
x = c_void_p * 10 for e in y: x[i] = e
but this gets a syntax error.
The C code clearly wants the address of an array. How do I get this to happen?
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Answer
The following code works on arbitrary lists:
import ctypes py_values = [1, 2, 3, 4] arr = (ctypes.c_int * len(py_values))(*py_values)