Question

我想知道如何在c中通过管道输出stdout。这是从Linux传递命令'ls'的stdout并将其存储在变量中，然后输出变量值的示例：

import subprocess
#Piping stdout of the command 'ls' from linux
test = subprocess.Popen("ls", stdout = subprocess.PIPE)
stdoutpiped = test.stdout.read().decode('utf-8')
print(stdoutpiped)

运行代码的结果：

Destkop
Documents
Images
Videos
Downloads
MyCodes
passwords.txt

您将如何在c中执行此操作？

谢谢！

Answer 1

您可以使用popen尝试以下操作：

#include <stdio.h>

#define PATH_MAX 1000

int main( ) {

    FILE *fp;
    int status;
    char path[PATH_MAX];


    fp = popen("ls *", "r");
    if (fp == NULL)
    /* Handle error */;


    while (fgets(path, PATH_MAX, fp) != NULL)
        printf("%s", path);


    status = pclose(fp);
    if (status == -1) {
        /* Error reported by pclose() */
        printf("Error, reported");
    } else {
        /* Use macros described under wait() to inspect `status' in order
         to determine success/failure of command executed by popen() */
        printf("Done running");
    }

    return 0;
}

您会找到更多信息here。

C中的管道标准输出

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