Python调用C/C++程序

 1 #include <stdio.h>
 2 #include <stdlib.h>
 3 #include <string.h>
 4 
 5 class PythonTest{
 6 public:
 7     PythonTest():_is_inited(false), _num(0){
 8     
 9     }   
10 
11     int init(int num){
12         _num = num;
13         _is_inited = true;
14         printf("inited ok\n");
15         return 0;
16     }   
17     
18     int str2(char *src, char* dest, int len){
19         if (src == NULL || len <= 0){ 
20             return 0;
21         }   
22 
23         int src_len = strlen(src);
24         int num = snprintf(dest, len, "%s%s", src, src);
25         return (num < len -1)? num:0;
26     }   
27 
28     bool is_inited(){
29         printf("_num = %d\n", _num);
30         return _is_inited;
31     }   
32 
33 private:
34     bool _is_inited;
35     int _num;
36 };

 1 #include "pycall.h"
 2 
 3 extern "C" {
 4 
 5 PythonTest py; 
 6 
 7 int init(int num){
 8     return py.init(num);
 9 }
10 
11 bool is_inited(){
12     return py.is_inited();
13 }
14 
15 int str2(char* src, char* dest, int len){
16     return py.str2(src, dest, len);
17 }
18 
19 int add(int a, int b){ 
20     return a + b;
21 }
22 
23 }

 1 #coding=utf-8
 2 
 3 import ctypes 
 4 from ctypes import *
 5 
 6 ##加载库文件
 7 ll = ctypes.cdll.LoadLibrary  
 8 lib = ll("./libpycall.so")   
 9 
10 ##call
11 fun=lib.init    ###类似C/C++函数指针
12 fun.restype = c_int ##设置函数返回值类型
13 print fun(8);
14 print "*" * 20
15 
16 ##call
17 fun=lib.is_inited
18 fun.restype = c_bool
19 print fun();
20 print "*" * 20
21 
22 ##call
23 fun=lib.str2
24 src = "hello world "
25 dest = "*" * 30     ###申请buf, 用于保存返回结果 
26 num = fun(src, dest, len(dest)) ###传递指针作为参数
27 if num != 0:
28     print dest[:num]
29 else:
30     print "buf is not ok"
31 print "*" * 20
32 
33 ##call
34 print lib.add(1, 2); 
35 print "*" * 20