文件夹操作函数

骑猪看日落 2021-12-12 06:23 323阅读 0赞

原文网址：[文件夹操作函数\_IT利刃出鞘的博客-CSDN博客][IT_-CSDN]

# readdir #

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 <td style="vertical-align:top;width:84.8pt;"> 作用 </td> 
 <td style="vertical-align:top;width:449.3pt;"> 返回参数dir 目录流的下个目录进入点 </td> 
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 <td style="vertical-align:top;width:84.8pt;"> 头文件 </td> 
 <td style="vertical-align:top;width:449.3pt;"> #include &lt;sys/types.h&gt; &nbsp;&nbsp; #include &lt;dirent.h&gt; </td> 
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 <td style="vertical-align:top;width:84.8pt;"> 函数定义 </td> 
 <td style="vertical-align:top;width:449.3pt;"> struct dirent * readdir(DIR * dir); 备注： struct dirent { &nbsp; &nbsp; long d_ino;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;/* inode number 索引节点号 */ &nbsp; &nbsp; off_t d_off;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;/* offset to this dirent 在目录文件中的偏移 */ &nbsp; &nbsp; unsigned short d_reclen;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;/* length of this d_name 文件名长 */ &nbsp; &nbsp; unsigned char d_type;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;/* the type of d_name 文件类型 */ &nbsp; &nbsp; char d_name [NAME_MAX+1];&nbsp; &nbsp;/* file name (null-terminated) 文件名，最长255字符 */ } </td> 
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 <td style="vertical-align:top;width:84.8pt;"> 返回值 </td> 
 <td style="vertical-align:top;width:449.3pt;"> 成功则返回下个目录进入点. 有错误发生或读取到目录文件尾则返回NULL </td> 
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 <td style="vertical-align:top;width:84.8pt;"> 示例 </td> 
 <td style="vertical-align:top;width:449.3pt;"> main() { &nbsp;&nbsp;&nbsp;&nbsp;DIR * dir; &nbsp;&nbsp;&nbsp;&nbsp;struct dirent * ptr; &nbsp;&nbsp;&nbsp;&nbsp;int i; &nbsp;&nbsp;&nbsp;&nbsp;dir = opendir("/etc/rc.d"); &nbsp;&nbsp;&nbsp;&nbsp;while((ptr = readdir(dir)) != NULL) &nbsp;&nbsp;&nbsp;&nbsp;{ &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;printf("d_name : %s\n", ptr-&gt;d_name); &nbsp;&nbsp;&nbsp;&nbsp;} &nbsp;&nbsp;&nbsp;&nbsp;closedir(dir); } 执行： d_name : . d_name : .. d_name : dir1 d_name : dir2 </td> 
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[IT_-CSDN]: https://knife.blog.csdn.net/article/details/95361714