C ++ calls python

C ++ calls python

This document describes how to call python in C ++ using the instance code.


This article implements three functions in util. h:

1. init_log: use google log (glog) to initialize log
2. exe_command: shell code executed by C ++
3. exe_py: C ++ calls the python File

Code:

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 
  
                                                               #include 
   
                                                                #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
    
     & 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 
  
                                                                  #include 
   
                                                                   #include 
    
                                                                   #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] = '';                                             //buf_res                                                                        fprintf(stderr, ------------EXE RESULT: %s------------, 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
     
      & 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 +                                               sys.path.append(pyfiles) +                                  import  + module_name +  +                                    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 
  
                                                                      #include 
   
                                                                        #include 
    
                                                                         #include 
     
                                                                          #include 
      
        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
       
        py_args(arg_v, arg_v + sizeof(arg_v)/sizeof(arg_v[0])); exe_py(printargs, pr, py_args); 
       
      
     
    
   
  

Note the Makefile:

You need to include the directory of python. h, that is, add-std = C ++ 11 to the c ++ compilation parameter of the include directory of python:
CXXFLAGS ('-g-pipe-W-Wall-fPIC-std = c ++ 11') include glog directory

Finally, let's take a look at the program structure in this article:

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