struct dirent {     long d_ino;                 /* inode number 索引节点号 */     off_t d_off;                /* offset to this dirent 在目录文件中的偏移 */     unsigned short d_reclen;    /* length of this d_name 文件名长 */     unsigned char d_type;        /* the type of d_name 文件类型 */        char d_name [NAME_MAX+1];   /* file name (null-terminated) 文件名，最长255字符 */ } struct __dirstream   {     void *__fd;                        /* `struct hurd_fd' pointer for descriptor.  */     char *__data;                /* Directory block.  */     int __entry_data;                /* Entry number `__data' corresponds to.  */     char *__ptr;                /* Current pointer into the block.  */     int __entry_ptr;                /* Entry number `__ptr' corresponds to.  */     size_t __allocation;        /* Space allocated for the block.  */     size_t __size;                /* Total valid data in the block.  */     __libc_lock_define (, __lock) /* Mutex lock for this structure.  */   }; typedef struct __dirstream DIR;

#include <sys/types.h> #include <dirent.h> #include <unistd.h> #include <stdio.h> int main(){     DIR    *dir;     struct    dirent    *ptr;     dir = opendir("."); ///open the dir     while((ptr = readdir(dir)) != NULL) ///read the list of this dir     {         #ifdef _WIN32             printf("d_name: %s\n", ptr->d_name);         #endif         #ifdef __linux             printf("d_type:%d d_name: %s\n", ptr->d_type,ptr->d_name);         #endif     }     closedir(dir);     return 0; }