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  • Python调用C语言函数

    Python调用C,主要是依靠Python的ctypes调用动态链接库

     

    返回“简单类型”

    C代码:

    int
    multiply(int num1, int num2)
    {
        return num1 * num2;
    }

    gcc命令:

    gcc -c -fPIC libtest.c
    gcc -shared libtest.o -o libtest.so

    Python调用:

    >>> from ctypes import *
    >>> import os
    >>> libtest = cdll.LoadLibrary(os.getcwd() + '/libtest.so')
    >>> print libtest.multiply(2, 2)
    4
    返回“结构体类型”
     
    C代码:
    typedef struct pointer_test_s
    {
      char name[20];
      int age;
    }pointer_test_t, *struct_pointer;
    
    struct_pointer test()    // 返回结构体指针
    { 
      struct_pointer p = (struct_pointer)malloc(sizeof(pointer_test_t)); 
      strcpy(p->name, "Joe");
      p->age = 20;
    
      return p; 
    }

    Python代码:

    #!/bin/env python
    # coding=UTF-8
    
    from ctypes import *
    
    #python中结构体定义
    class StructPointer(Structure):
        _fields_ = [("name", c_char * 20), ("age", c_int)]
    
    if __name__ == "__main__":
        lib = cdll.LoadLibrary("./libtest.so")
        lib.test.restype = POINTER(StructPointer)
        p = lib.test()
    
        print "%s: %d" %(p.contents.name, p.contents.age)

    附类型对照:

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  • 原文地址:https://www.cnblogs.com/claresun/p/3666381.html
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