C++实现目录下所有文件添加后缀名

             C++实现给指定目录下的除目录外的所有文件添加指定的后缀名

                                      qianghaohao(孤狼)

      用C++动手写了个小工具：给指定目录下的除目录外的所有文件添加指定的后缀名。

     运行环境：linux平台

     使用方法：./rename_file    目录名    后缀名 

    使用示例：./rename_file  /home/qiang1994/hello  .html       //给/home/qiang1994/hello目录下

                                                                                                 //除目录文件外的所有文件添加.html后缀             

   源代码如下:

#include<iostream>
#include<stdio.h>
#include <sys/types.h>
#include <dirent.h>
#include <cstring>
/**********************************************************************
     created:    2016/01/20
     created:    20:1:2016 21:04
     filename:   rename_file.cpp
     file base:  main
     file ext:   cpp
     author:     qianghaohao

     pupose:     The function of this program is to give all
                 the files under the directory specified by 
                 the user to add the suffix, except catalog file
     usage:      command dir_name suff_name
**********************************************************************/
int main(int argc, char **argv)
{
    DIR *dir;
    struct dirent *ptr;
    if (argc < 3)
    {
        std::cout << "Usage:" << argv[0] << " dir_name suff_name" << std::endl;
         return -1;
    } 
    std::cout << "directory:" << argv[1] << std::endl;  //print current dir_name
    if ((dir = opendir(argv[1])) == NULL)    //open directory
    {
        std::cout << "open directory failed..." << std::endl;
        return -2;
    }
    std::string new_name; 
    std::string old_name;
    while ((ptr = readdir(dir)) != NULL)    
    {
        if (ptr->d_type != DT_DIR)  //if file is not directory 
        {
            old_name = argv[1];
            old_name += "/";
            old_name += ptr->d_name;  //old name

            new_name = argv[1];
            new_name += "/";
            new_name += ptr->d_name; 
            std::cout << new_name << " to ";
            new_name += argv[2];  //new name include suffix
            std::cout << new_name; 
            if (rename(old_name.c_str(), new_name.c_str()) == 0)  //rename file not directory
            {
               std::cout << " successed..." << std::endl;
            }
            else
            {
              std::cout << " failed..." << std::endl;
            }
        }
    }
    closedir(dir);  //close directory
    std::cout << "     complete!" << std::endl;
    return 0;
}