文件夹操作

1. opendir

DIR *opendir(const char *name);
DIR *fdopendir(int fd);

打开一个目录，失败返回空

2. readdir

struct dirent *readdir(DIR *dirp);
int readdir_r(DIR *dirp, struct dirent *entry, struct dirent **result);

读目录

struct dirent 
{
    ino_t          d_ino;       /* inode number 索引节点号*/
    off_t          d_off;       /* offset to the next dirent 在目录文件中的偏移*/
    unsigned short d_reclen;    /* length of this record 文件名长*/
    unsigned char  d_type;      /* type of file; not supported by all file system types 文件类型*/
    char           d_name[256]; /* filename 文件名，最长255字符*/
};

3. closedir

int closedir(DIR *dirp);

4. 举例

DIR *dir = opendir("./");

struct dirent *de;

if(dir)
{   
    while((de = readdir(dir)))
    {   
        puts(de->d_name);
    }   
}

closedir(dir);