如何从C中的stdout读取 [英] how to read from stdout in C

问题描述

我需要编写一个 C 程序 (myprogram) 来检查其他程序的输出.它应该基本上是这样工作的:

I need to write a C program (myprogram) which checks output of other programs. It should basically work like this:

./otherprogram | ./myprogram

但我找不到如何从 stdout(或管道)中逐行读取，然后将所有这些写入 stdout.

But I could not find how to read line-by-line from stdout (or the pipe), and then write all this to stdout.

推荐答案

使用以下方法创建可执行文件:

Create an executable using:

#include <stdio.h>

int main()
{
   char line[BUFSIZ];
   while ( fgets(line, BUFSIZ, stdin) != NULL )
   {
      // Do something with the line of text
   }
}

然后您可以将任何程序的输出通过管道传输到它，逐行读取内容，对每一行文本进行处理.

Then you can pipe the output of any program to it, read the contents line by line, do something with each line of text.

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