DJGPP vs. VC++ 6.0

I have the written the following code that works in the DJGPP compiler, but doesn't in the VC++ 6.0 compiler with service packs:

SightLine *allPoint = new SightLine;

while (!agIn.is_open())
{
     cout << "Please enter survey file: ";
     getline(cin, fName);

     try
     {
          if (fName.length() == 0 && EOF)
               throw 103;

          agIn.open(fName.c_str());

          if (!agIn.is_open())
               throw 101;
     }
     catch (int error)
     {
          ret = errorHandler(error);

          if (ret == -1)
          {
               delete allPoint;
               return 0;
          }
     }
}

agIn is an ifstream.  errorHandler and SightLine are included header files I've created.  The problem is when I run it to test a file that doesn't exist, it will throw the error.  Then I give it the correct file, and it doesn't read from it correctly.  It will open the file, but shows nothing in it.  It almost seems like the file doesn't stay open.  If I run it without entering the wrong file name first, it works, and if I run it either way in DJGPP it works.