opendir ,readdir 测试demo

#include<sys/types.h>
#include <stdio.h>
#include<dirent.h>
#include<unistd.h>
int main(int argc,char **argv)
{
    DIR * dir;
    struct dirent * ptr;
    int i;
    if(argc==1)
        dir=opendir("./");
    else
        dir=opendir(argv[1]);
    while((ptr=readdir(dir))!=NULL)
    {
        printf("d_name: %s
",ptr->d_name);//需要更详细的信息你可以修改该句
    }
    closedir(dir);
    return 0;
}

读取当前目录并显示当前目录下的内容.

测试通过.

运行结果:

yuanwei@lol:~/test$ gcc -o readir readdir.c 
yuanwei@lol:~/test$ l
readdir.c  readir*
yuanwei@lol:~/test$ ls
readdir.c  readir
yuanwei@lol:~/test$ ./readir 
d_name: readdir.c
d_name: .
d_name: ..
d_name: readir