如何将系统命令输出存储在变量中? [英] How to store the system command output in a variable?

问题描述

我正在执行一个system()函数，该函数返回一个文件名.现在，我不想在屏幕上显示输出(即文件名)或管道到新文件.我只想将其存储在变量中.那可能吗?如果是这样，怎么办?谢谢

I am executing a system() function which returns me a file name. Now I dont want to display the output on the screen(ie the filename) or pipe to a newfile. I just want to store it in a variable. is that possible? if so, how? thanks

推荐答案

单个文件名?是的.当然可以，但是不能使用 system().

A single filename? Yes. That is certainly possible, but not using system().

使用 popen() .在 c 和

Use popen(). This is available in c and c++, you've tagged your question with both but are probably going to code in one or the other.

这是C语言中的一个示例:

Here's an example in C:

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main()
{
    FILE *fpipe;
    char *command = "ls";
    char c = 0;

    if (0 == (fpipe = (FILE*)popen(command, "r")))
    {
        perror("popen() failed.");
        exit(EXIT_FAILURE);
    }

    while (fread(&c, sizeof c, 1, fpipe))
    {
        printf("%c", c);
    }

    pclose(fpipe);

    return EXIT_SUCCESS;
}

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