Redirecting cin?

I can easily redirect the standard output to the terminal but getting the standard input to redirect to the terminal isn't working. I'm stumped.

Code:

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#include <iostream>
#include <fstream>
#include <string>
using namespace std;

int main(int argc, char* argv[]){
    string username;
    char c;
    ifstream termin("/dev/tty");
    ofstream termout("/dev/tty");
    termout << "Enter SQL user name: ";
    termout.flush();
//    termin.getline(username, 16);    //didn't work
//    termin >> username;              //Me neither
//    while ((c = termin.get()) > ' ');//Nope
    cout << username << endl;
}

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Easy newbie mistake?

[edit]

Code:

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while (isgraph(c = cin.get())) username += c;

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does work but, of course, that won't handle redirected input.
[/edit]

I don't know if this will fix your problem, but:

Code:

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>    termin.getline(username, 16);

//This should be:
  getline(termin,username);

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Thanks swoopy. No that did work either... oh well. It seems that for some things I have to drop into c proper because either c++ can't do it or because it's extremely non-intuitive to do in c++. It's all part of the learning process.

Remembering that stdin is a file pointer, just freopen() it as your tty.

Thanks Imperito too. I saw the freopen solution while googling. Here's my very C-ish solution (see below). I'm new to c and even newer to c++. What I'm doing is trying to make the classes a bit more C++ish. Like making the char* become a string object & the printf become cout etc. Along the way I'm running into some SNAFUs that don't seem to fit the c++ paradigm but work quite easily in the "lower level" language. It's a matter of learning which tool is right for the job. At least c++ allows c code & if I really feel the need I can in-line assembly a lib or something.

Code:

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//#############################################################################
//UserName = Prompt for same --- A work in progress
//#############################################################################
void DB::UserName(char* user) throw (TerminalError){
    FILE*  ttyin;  //Redirect input  to the terminal
    FILE*  ttyout; //Redirect output to the terminal

    //=========================================================================
    // Need to redirect i/o to the terminal for this prompt
    //=========================================================================
    ttyin  = fopen("/dev/tty", "r");
    ttyout = fopen("/dev/tty", "w");
    if (!ttyin || !ttyout){
        if (ttyin)  fclose(ttyin);
        if (ttyout) fclose(ttyout);
        throw TerminalError();
    }

    //=========================================================================
    // Now prompt for the SQL user name
    //=========================================================================
    fprintf(ttyout, "Enter SQL username: ");
    fflush(ttyout);
    fgets(user, 16, ttyin);
    for (int i = 0; user[i] && i < 16; i++) if (user[i] == '\n') user[i] = 0;

    fclose(ttyin);
    fclose(ttyout);
}

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Another thing I'm trying to avoid is writing wrappers around wrappers which seems to be a pitfall for an OO newbie.