如何在C / C ++中将系统调用的输出重定向到程序内部? [英] How to redirect the output of a system call to inside the program in C/C++?
问题描述
我正在用C ++编写程序,对Linux OS当前目录中的所有文件进行一些特殊处理。
I'm writing a program in C++ which do some special treatment for all the files in the current directory on Linux OS.
所以我在考虑使用诸如 system( ls)
之类的系统调用来获取所有列表文件。
So i was thinking of using system calls such as system("ls")
to get the list of all files.
但是如何将其存储在我的程序中? (如何将ls的输出重定向到我在程序中声明的字符串)
but how to store it then inside my program ? ( how to redirect the output of ls to let's say a string that i declared in the program )
谢谢
推荐答案
我建议您不要调出 ls
-使用 opendir / readdir正确完成工作/ closedir
直接读取目录。
I suggest you don't call out to ls
- do the job properly, using opendir/readdir/closedir
to directly read the directory.
代码示例,打印目录条目:
Code example, print directory entries:
// $ gcc *.c && ./a.out
#include <stdlib.h> // NULL
#include <stdio.h>
#include <dirent.h>
int main(int argc, char* argv[]) {
const char* path = argc <= 1 ? "." : argv[1];
DIR* d = opendir(path);
if (d == NULL) return EXIT_FAILURE;
for(struct dirent *de = NULL; (de = readdir(d)) != NULL; )
printf("%s/%s\n", path, de->d_name);
closedir(d);
return 0;
}
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