如何在带有参数的linux中的C代码中执行外部程序? [英] How do I execute external program within C code in linux with arguments?

问题描述

我想在C代码中执行另一个程序. 例如，我要执行命令

I want to execute another program within C code. For example, I want to execute a command

./foo 1 2 3

foo是存在于同一文件夹中的程序，而1 2 3是自变量. foo程序创建一个文件，该文件将在我的代码中使用.

foo is the program which exists in the same folder, and 1 2 3 are arguments. foo program creates a file which will be used in my code.

我该怎么做?

推荐答案

使用简单的方法，使用system():

For a simple way, use system():

#include <stdlib.h>
...
int status = system("./foo 1 2 3");

system()将等待foo完成执行，然后返回状态变量，可用于检查例如exitcode(命令的退出码乘以256，因此将system()的返回值除以该值即可得到实际的退出码:int exitcode = status / 256).

system() will wait for foo to complete execution, then return a status variable which you can use to check e.g. exitcode (the command's exitcode gets multiplied by 256, so divide system()'s return value by that to get the actual exitcode: int exitcode = status / 256).

wait() 的联机帮助页(在您的Linux系统)列出了可用于检查状态的各种宏，最有趣的是WIFEXITED和WEXITSTATUS.

或者，如果您需要读取foo的标准输出，请使用popen(3)，它返回文件指针(FILE *);这样，与命令的标准输入/输出进行交互就等于从文件中读取或写入文件.

Alternatively, if you need to read foo's standard output, use popen(3), which returns a file pointer (FILE *); interacting with the command's standard input/output is then the same as reading from or writing to a file.

这篇关于如何在带有参数的linux中的C代码中执行外部程序?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！