如何在C ++中将十六进制值转换为正确的字符串？

Question

I am still working on a database for movies and I would like to show the user what he has input to the file.

However when i use cout << lisafilm << it provides me with hex value. Therefore, I need to conver hex to string.

Snippet of trouble.

void sisend() 
{ 
     string nimi; 
     int aasta; 
     long int hinne; 
     string vaadatud; 
     ofstream lisafilm("andmebaas.txt", ios::app); 
     cout <<"Sisestage filmi nimi." << endl; 
     cin >> nimi;

     cout << "Sisestage filmi aasta." << endl; 
     cin >> aasta;     

     cout << "Sisestage filmi hinne." << endl; 
     cin >> hinne; 

     cout << "Kas olete filmi juba vaadanud?" << endl;  
     cout << "Vastake 'Jah' voi 'Ei'" << endl; 
     cin >> vaadatud; 

lisafilm<< nimi << "  " << aasta << "  " << hinne<< "  " << vaadatud << endl; 
lisafilm.close();    

{  
 system("CLS"); 
 int hex_str = lisafilm ;

 cout << "Aitah kasutamast andmebaasi." << endl; 
 system("pause"); 
 cin.get (); 
} 
 main(); 

}  

Answer 1

when i use cout << lisafilm it provides me with hex value

This is because you are trying to output an ofstream . When this happens, operator void* gets called, producing an arbitrary hex sequence which is tied to your stream, but ultimately is very much useless.

Answer 2

Try this:

std::stringstream ss;
ss << std::hex << lisafilm;
const std::string s = ss.str();

Answer 3

lisafilm is a stream , not a string

If you want to copy lisafilm to cout something like cout << lisafilm.rdbuf(); would do the trick (assuming that lisafilm is an ostream or istream and that lisafilm's position is the start of the file.

Your code is very poorly formatted, I don't think what you posted would compile. If you clean it up stackoverflow may be able to help you more.