int find_dir_file(const char *dir_name,vector<string>& v) //文件夹地址,文件列表
{
DIR *dirp;
struct dirent *dp;
dirp = opendir(dir_name);
while ((dp = readdir(dirp)) != NULL) {
v.push_back(std::string(dp->d_name ));
}
(void) closedir(dirp);
return 0;
}