充分利用标准输出在C系统命令输出 [英] Getting output of a system command from stdout in C

问题描述

我写的Andr​​oid下的/ Linux下C程序运行系统命令。该命令输出一些文本到stdout，我试图捕获输出到一个字符串或字符数组。

I'm writing a C program under Android/Linux that runs a system command. The command outputs some text to stdout, and I'm trying to capture the output into a string or character array.

例如：

system("ls");

将列出当前目录到标准输出的内容，我希望能够捕获数据到一个变量编程用C

would list the contents of the current directory to stdout, and I would like to be able to capture that data into a variable programmatically in C.

我如何做到这一点？

感谢。

推荐答案

您想要使用的popen 。它返回一个流，如的fopen 。但是，你需要关闭与函数，pclose 流。这是因为函数，pclose 负责清理与启动子进程相关联的资源的照顾。

You want to use popen. It returns a stream, like fopen. However, you need to close the stream with pclose. This is because pclose takes care of cleaning up the resources associated with launching the child process.

FILE *ls = popen("ls", "r");
char buf[256];
while (fgets(buf, sizeof(buf), ls) != 0) {
    /*...*/
}
pclose(ls);

这篇关于充分利用标准输出在C系统命令输出的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！