C++调用python

本文以实例code讲解 C++ 调用 python 的方法。

本文在util.h中实现三个函数：

1. init_log: 用google log(glog)初始化log
2. exe_command: 由 C++ 执行 shell code
3. exe_py: C++调用python文件

Code:

Python:

def pr(args):
for arg in args:
print arg

1

2

3

C++:
include/util.h:

/***************************************************************************
*-
* Copyright (c) 2015 Baidu.com, Inc. All Rights Reserved
*-
**************************************************************************/
-
-
-
/**
* @file util.h
* @author zhangruiqing01(zhangruiqing01@baidu.com)
* @date 2015/10/24 02:17:56
* @version $Revision$-
* @brief-
*  i
**/

#ifndef  __UTIL_H_
#define  __UTIL_H_

#include "glog/logging.h"
#include <string>
#include <vector>

#define PYTHON_LIB_PATH "~/.jumbo/lib/python2.7"
#define PYTHON_BIN_PATH "~/.jumbo/bin/python2.7"

// initial log
void init_log(const char* argv);

// exe shell command
char* exe_command(const char* cmd);

// exe python command
void exe_py(
const std::string module_name,
const std::string func_name,
const std::vector<std::string>& args);

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

src/util.cpp:

/***************************************************************************
*-
* Copyright (c) 2015 Baidu.com, Inc. All Rights Reserved
*-
**************************************************************************/
-
-
-
/**
* @file src/util.cpp
* @author zhangruiqing01(zhangruiqing01@baidu.com)
* @date 2015/10/24 02:12:34
* @version $Revision$-
* @brief-
*--
**/

#include "util.h"
#include <stdio.h>
#include <errno.h>
#include <Python.h>
#define MAX_LENGTH 2048

void init_log(const char* argv){
if (!getenv("GLOG_logtostderr")) {
google::LogToStderr();
}
google::InstallFailureSignalHandler();
google::InitGoogleLogging(argv);
LOG(INFO) << "Create Log successfully";
}

char* exe_command(const char* cmd){
FILE* fres;
if ((fres = popen(cmd, "r")) != NULL){
char* buf_res = (char*) malloc(MAX_LENGTH);
fread(buf_res, MAX_LENGTH, 1, fres);
buf_res[strlen(buf_res) - 3] = '\0';
//buf_res
fprintf(stderr, "------------\nEXE RESULT: %s\n------------\n", buf_res);
pclose(fres);
return buf_res;
}
else{
LOG(FATAL) << "Failed to execute '" << cmd << "'";
}
}

void exe_py(
const std::string module_name,
const std::string func_name,
const std::vector<std::string>& args){
std::string args_str = "";
for(auto& arg : args){
args_str += arg + ",";
}

std::string cmd = "LD_LIBRARY_PATH=" +
std::string(PYTHON_LIB_PATH) + ":" + "$LD_LIBRARY_PATH " +
std::string(PYTHON_BIN_PATH) +
" -c 'import sys\n" +
"sys.path.append(\"pyfiles\")\n" +
"import " + module_name + "\n" +
"ret = " + module_name + "." + func_name + "([" +
args_str + "])'";
LOG(INFO) << "exec command: "<< cmd;
char* res = exe_command(cmd.c_str());
}

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

51

52

53

54

55

56

57

58

59

60

61

62

63

64

65

66

67

68

69

main.cpp:

/***************************************************************************
*-
* Copyright (c) 2015 Baidu.com, Inc. All Rights Reserved
*-
**************************************************************************/
-
-
-
/**
* @file src/util.cpp
* @author zhangruiqing01(zhangruiqing01@baidu.com)
* @date 2015/10/23 10:41:23
* @version $Revision$-
* @brief-
*--
**/

#include <stdio.h>
#include <vector>
#include <string>
#include <util.h>
#include <iostream>

int main(int argc, char* argv[]){
//initial log
init_log(argv[0]);

char cmd[100]="echo 'abc'";
char* res = exe_command(cmd);

std::string arg_v[] = {"1"};
std::vector<std::string>py_args(arg_v, arg_v + sizeof(arg_v)/sizeof(arg_v[0]));
exe_py("printargs", "pr", py_args);

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

注意其中的Makefile文件：

需要include python.h 所在目录，即python的include目录

C++编译参数加入-std=c++11：
CXXFLAGS(‘-g -pipe -W -Wall -fPIC -std=c++11’)

include glog所在目录

最后看一下本文中程序的结构：



执行结果：



from: http://blog.csdn.net/abcjennifer/article/details/49377123