如何使用POSIX在C ++中执行命令并获取命令的输出？ [英] How to execute a command and get output of command within C++ using POSIX?

问题描述

我正在寻找一种方法来在C ++程序中运行时获取命令的输出。我已经看过使用system（）函数，但只是执行一个命令。这里是我正在寻找的示例：

  std :: string result = system（./some_command）; 
  

我需要运行一个任意命令并得到它的输出。我已经看过Boost.org，但我没有找到任何会给我需要的东西。

解决方案

  #include< cstdio> 
 #include< iostream> 
 #include< memory> 
 #include< stdexcept> 
 #include< string> 
 
 std :: string exec（const char * cmd）{
 char buffer [128]; 
 std :: string result =; 
 std :: shared_ptr< FILE> pipe（popen（cmd，r），pclose）; 
 if（！pipe）throw std :: runtime_error（popen（）failed！）; 
 while（！feof（pipe.get（）））{
 if（fgets（buffer，128，pipe.get（））！= NULL）
 result + = buffer; 
} 
 return result; 
} 
  

Pre-C ++ 11版本：

  #include< iostream> 
 #include< stdexcept> 
 #include< stdio.h> 
 #include< string> 
 
 std :: string exec（const char * cmd）{
 char buffer [128]; 
 std :: string result =; 
 FILE * pipe = boen（cmd，r）; 
 if（！pipe）throw std :: runtime_error（popen（）failed！）; 
 try {
 while（！feof（pipe））{
 if（fgets（buffer，128，pipe）！= NULL）
 result + = buffer; 
} 
} catch（...）{
 pclose（pipe）; 
 throw; 
} 
 pclose（pipe）; 
 return result; 
} 
  

取代 popen 和与 和 >


I am looking for a way to get the output of a command when it is run from within a C++ program. I have looked at using the system() function, but that will just execute a command. Here's an example of what I'm looking for:

std::string result = system( "./some_command" ) ;

I need to run an arbitrary command and get it's output. I've looked at Boost.org but I have not found anything that will give me what I need.

解决方案

#include <cstdio>
#include <iostream>
#include <memory>
#include <stdexcept>
#include <string>

std::string exec(const char* cmd) {
    char buffer[128];
    std::string result = "";
    std::shared_ptr<FILE> pipe(popen(cmd, "r"), pclose);
    if (!pipe) throw std::runtime_error("popen() failed!");
    while (!feof(pipe.get())) {
        if (fgets(buffer, 128, pipe.get()) != NULL)
            result += buffer;
    }
    return result;
}

Pre-C++11 version:

#include <iostream>
#include <stdexcept>
#include <stdio.h>
#include <string>

std::string exec(const char* cmd) {
    char buffer[128];
    std::string result = "";
    FILE* pipe = popen(cmd, "r");
    if (!pipe) throw std::runtime_error("popen() failed!");
    try {
        while (!feof(pipe)) {
            if (fgets(buffer, 128, pipe) != NULL)
                result += buffer;
        }
    } catch (...) {
        pclose(pipe);
        throw;
    }
    pclose(pipe);
    return result;
}

Replace popen and pclose with _popen and _pclose for Windows.

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