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ctypes examples
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| // gcc -std=c99 -O3 -fPIC -shared -Wl,-soname,mylib -o mylib.so mylib.c | |
| #include <stdio.h> | |
| #include <complex.h> | |
| int build_hamiltonian(int i, double d, complex double *m) | |
| { | |
| m[0]=2.*I; | |
| return 0; | |
| } |
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| import numpy as np | |
| from numpy.ctypeslib import ndpointer | |
| from ctypes import * | |
| class PointerWrapper(object): | |
| """Just like ndpointer, but accept None!""" | |
| def __init__(self,pointer): | |
| self.pointer=pointer | |
| def from_param(self,param): | |
| if param!=None: | |
| return self.pointer.from_param(param) | |
| else: | |
| return POINTER(c_double).from_param(None) | |
| mylib=CDLL('/tmp/mylib.so') | |
| mylib.myfunc.argtypes=[c_int,c_double,PointerWrapper(ndpointer(dtype=np.complex128,ndim=2,flags='C'))] | |
| mylib.myfunc.restype=c_int | |
| m=np.zeros((2,2),dtype=np.complex128) | |
| mylib.myfunc(1,0.5,m) | |
| print m |
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