void ChangeName(string filename)
{char flagcharacter = 'a';        // 要在文件名前添加的标志字符int filelocation = 0 ;          // 暂存文件名起始下标int directoryend = 0 ;         // 暂存文件夹名结束下标for(int i = (filename.length() - 1); i>=0; i--)if(filename[i] == '/' || filename[i] == '\\'){directoryend = i ;filelocation = i+1 ;break;}char oldfile[500], newfile[500] ;memset(oldfile, '\0', 500) ;memset(newfile, '\0', 500) ;for(int i=0; i<filename.length(); i++)oldfile[i] = filename[i] ;for(int i=0; i<=directoryend; i++){newfile[i] = filename[i];}newfile[directoryend+1] = flagcharacter;for(int i=filelocation; i<filename.length(); i++)newfile[i+1] = filename[i] ;rename(oldfile, newfile);
}

此函数参考了来自C语言的rename function in C