将系统的输出(char *命令)加载到变量，C ++ [英] Loading output of System (char* command) to variable, c++

问题描述

...正在尝试加载/捕获系统(char *命令)的输出函数作为变量，即 vector .有什么办法可以将输出推到我的向量上?我不想将输出写入文件并再次读取.示例代码:

...Am trying to load/capture the output of system(char* command) function to a variable, a vector. can i have any possible way to push the output to my vector? I don*t want to write the output to file and read it again. Sample code:

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fstream>
#include <iostream>
#include <string>
#include <cstring>
#include <sstream>
#include <vector>


using namespace std;

int main()
{
    vector <string> dir;
    system("pwd");//here i used this to print the current directory, and i want to store this out put to my vector. something like...(below )
    output=output of system("pwd");//this is not a real code,just to notice i want to put the out put to other var and push.
    dir.push_back(output);
return 0;
}

谢谢，我能在任何情况下完成此任务吗.

Can i have any scenario to do this task, thanks.

推荐答案

我建议这样做:

FILE *fp = popen("fortune","r");
char line[200];
while(!feof(fp)) {
fgets(line,200,fp);
// process here
}
pclose(fp);

如果它确实对性能至关重要，那么最好使用fork()和管道为该孩子的stdin/stdout创建一个孩子进程写入或读取的过程.可以在此处找到一个示例(http://www.microhowto.info/howto/如果您已接受测试，则为capture_the_output_of_a_child_process_in_c.html#idp21888 ).但是popen方法可能是您所用的最简单直接的方法.

If it's really performance critical it's probably better to create a child process using fork() and pipes for stdin/stdout of that child process to write or read from. An example of this could be found here (http://www.microhowto.info/howto/capture_the_output_of_a_child_process_in_c.html#idp21888) if you're intested. But the popen method is probably the most simple and straightforward one in your case.

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