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
C++:
include/util.h:
/***************************************************************************
*-
* Copyright (c) 2015 Baidu.com, Inc. All Rights Reserved
*-
**************************************************************************/
-
-
-
/**
* @file util.h
* @author zhangruiqing01([email protected])
* @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);
src/util.cpp:
/***************************************************************************
*-
* Copyright (c) 2015 Baidu.com, Inc. All Rights Reserved
*-
**************************************************************************/
-
-
-
/**
* @file src/util.cpp
* @author zhangruiqing01([email protected])
* @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());
}
main.cpp:
/***************************************************************************
*-
* Copyright (c) 2015 Baidu.com, Inc. All Rights Reserved
*-
**************************************************************************/
-
-
-
/**
* @file src/util.cpp
* @author zhangruiqing01([email protected])
* @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);
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： 