Re: writing binary file (ios::binary)

From:
James Kanze <james.kanze@gmail.com>
Newsgroups:
comp.lang.c++
Date:
Mon, 28 Apr 2008 01:20:05 -0700 (PDT)
Message-ID:
<28891f77-e73e-461a-9acb-06544ab401bc@34g2000hsf.googlegroups.com>
On Apr 26, 1:31 am, Ron Eggler <unkn...@example.com> wrote:

the problem actually was that who ever started writing this
code (I'm just here to get it working ;) ) declared ofs as an
ofstream pointer. That's why ->, I just removed the pointer
and replaced all -> with .and it works just fine. So
fstream::open() doesn't work with an empty pointer, it
actually needs a valid fstream handle to load the file handle
in there - right?


Obviously. A member function can only be called on an object.
Defining a pointer doesn't create an object of the pointed to
type; all it creates is a pointer, initialized (or not) as you
specified.

The recommendation to pull out the debugger was not a good one.
You don't use a debugger unless you know exactly what you're
looking for, which means some understanding of the code already.
Using a debugger here would only have been valid if you knew (or
at least thought you knew) where the object was allocated and
the pointer initialized; you would note the address returned
from the new expression, and then verify that you still had the
same address in the pointer here. Using a debugger without
knowing exactly what you are looking for is a very bad reaction.

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James Kanze (GABI Software) email:james.kanze@gmail.com
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