文件保存：

#include 
     
       #include 
      
        using namespace std; /*save to path ./record/ */static void save_to_file(string file, string str) {    ofstream outfile;    outfile.open("record/" + file, ios::binary | ios::app | ios::in | ios::out);    outfile << str;    outfile.close();}
      
     

 

string组合：

 ostringstream oss;

 

end