Subj : Help using ::tellp() and ::tellg(()
To   : borland.public.cpp.borlandcpp
From : Maya <EscalanteCanada@netscape.net>
Date : Wed Oct 15 2003 06:22 pm

Hey folks!
Here is my problem:

When I retrieve the cursor position in a file for the next write/put, 
using 'std::fstream::tellp()', I get a value equal or greater than zero; 
which is what I am expecting. However, when retrieving the cursor 
position for the next read/get, using 'std::fstream::tellg()', I get a 
value equal or greater than -1; which not what I am expecting.

This will illustrate the problem:
My program has two variables 'next_read' and 'next_write'; after opening 
a file I retrieve the values from the file stream using '::tellg()' and 
'::tellp()' respectively.

Later when the application needs to write its data, it first gets the 
next_write value; which would initially be zero, and stores the data 
there; this works just fine, but when the application needs to get data 
from the file it fails miserably

I am assuming that the reason why the program fails to retrieve data is 
because the value returned by '::tellg()' is -1 and there is not data at 
that cursor position.

Am I right? Can anyone enlighten me in regards to this matter?


Thanks in advance

.