C语言获取目录下目录&文件列表

数据结构

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;

实现

• linux可以直接使用d_type判断是目录还是文件，win则不支持
• linux已经定义了NAME_MAX（centos6.5为255），win则需要定义，所以”#ifndef NAME_MAX”可改成”#ifdef WIN32”

#include <dirent.h>#include <string.h>//#ifdef WIN32#ifndef NAME_MAX    #define NAME_MAX 255#endifint listDir( char dirName[], char buffer[][NAME_MAX], const int maxFileAmount, const int maxStringLength ){    DIR *dir;    struct dirent *ptr;    dir = opendir( dirName ); //open the dir    int amount = 0;    while((ptr = readdir(dir)) != NULL && amount < maxFileAmount){ //read the list of this dir        strncpy( buffer[amount], ptr->d_name, maxStringLength );        #ifdef __linux            if (ptr->d_type == 4)                strcat( buffer[amount], "/" ); //add a folder marker        #endif        ++amount;    }    closedir(dir);    return amount;}