ofstream and rdstate()

• Previous message: Poison64: "int -> hex string"
• Next in thread: Francis Glassborow: "Re: ofstream and rdstate()"
• Reply: Francis Glassborow: "Re: ofstream and rdstate()"
• Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

Date: Tue, 29 Jun 2004 03:58:40 -0700

Hello
I am trying to check for the existence of a file name in a given
directory before I attempt to create this file, I don't want to replace
the file if it is already there.
I don't know HowTo, returning the ios::noreplace rdstate() is not the
same as not attempting the operation if the file exists from the start.

Thanks

// generate a Studnet file with random grades for
// accelarated C++ exercise 5-2
#include <iostream>
using std::cin;
using std::cout;
using std::endl;

#include <fstream>
using std::ofstream;

#include <string>
using std::string;

int main()
{
     // get number of lines from user
   cout << "Please indicate number of lines you want in a "
   "student file: ";
   int num;
   cin >> num;
   // get a name for the file
   cout << "Enter a name for this file: ";
   string s;
   cin >> s;

   // if file exists, ask for a different name, well, thats all I know
   ofstream oFile(s+".txt", ios::noreplace);
   if (oFile.rdstate() == ios::failbit){
       cout << "File already exists\n"
       "Please choose another name: ";
       cin >> s;
   }

   cout << "\n\n----- CREATED -----\n"
   "C:\\Some_Path" << s << endl
   << "Number of lines: " << num << endl;

   system("PAUSE");
   return 0;
}

• Previous message: Poison64: "int -> hex string"
• Next in thread: Francis Glassborow: "Re: ofstream and rdstate()"
• Reply: Francis Glassborow: "Re: ofstream and rdstate()"
• Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]