Reading a text file twice?

[Vector]

first, lets have a look at the format of my test.txt file:

ABCDE,somestrings andaspace,somenumbers,morenumbers

After i open the file, i have a while loop that has a nested a for loop and an if to test for the comma. i then break out of the loop to stop reading characters. My output is the first feild, for every line of the file.

Now, i'll do the same thing using a fresh loop with the same condition.Execpt i want to start at the fifth character for every line, until, of course, the loop reaches end of file.


To better explain lets look at some code.

#include <iostream>
#include <fstream>
#include <string>

using namespace std;


int main()
{
    string usrFileStr,
    fileStr = "test.txt",  // declaring string literal
    sLine;                        // declaring a string obj
    
    fstream inFile;                  // declaring a fstream obj
    char ch;
    
    cout << "Enter a file: ";
    cin >> usrFileStr;
    
    
    inFile.open( usrFileStr.c_str(), ios::in ); 
    // at this point the file is open and we may parse the contents of it
    
    
    while ( !inFile.eof() )
    {
          getline ( inFile, sLine ); // store contents of txt file into str Obj
          for ( int x = 0; x < sLine.length(); x++ )
          {         
              if ( sLine[ x ] == ',' )break; // when we hit a comma stop reading 
              //cout << sLine[ x ];
          }
          cout << endl;
        }             

  

        while ( !inFile.eof() )  //read the file again until we reach end of file
        {
              inFile.seekp( 6L, ios::cur );   // we will always want to start at this postion when reading the second feild
              
   
              getline( inFile, sLine ); // overwrite the contents of sLine
              for ( int y = 0; y < sLine.length(); y++ )
              {
                  if ( sLine[ y ] == ',' )break; // hit a comma then goto seekp until eof
                  cout << sLine[ y ];
              }
              cout << endl;
        }
        
    inFile.clear();
    inFile.close();
    
    
    
    fgetc( stdin );
    return 0;
}

I cant even get a simple loop to work after the first...
while ( getline( infile, sBuffer ) ) { cout << sBuffer << endl; }
doesnt give me the contents of the file. When it works fine the first time..
why is this?



And I'd really like to keep going, but i cant output anything for the second while loop.

I really dont want to go in a new direction here, is there something i can do to make it work without choosing a new path?

[melkiy]

Are you sure fstream::seekp() works? Why not to read 6 chars? I found a lot of ostream::seekp() references at the MSDN and none istream::seekp() !

[Duthomhas]

ostream::seekp() --> seek to put istream::seekg() --> seek to get

Hope this helps.

[Vector]

I've tried both, as well as reading the contents into a different varaible the second time around..


But it is possible to read the same file twice? Im sure it is, but i havent found any conformation yet.

[Malachi]

I don't believe you've reset the cursor position to the beginning of the file before trying to read it again...