4c5
Subj : Re: null pointer becomes 1
To   : borland.public.cpp.borlandcpp
From : "heon" <heon@haisystems.com>
Date : Mon Oct 20 2003 06:54 am

maeder@glue.ch (Thomas Maeder [TeamB]) wrote:
>"heon" <heon@haisystems.com> writes:
>
>> I dumped the pointer value and I expected it to be 0. but it came out as 1.
>
>The most probable reason is that your program somewhere overwrits memory it
>shouldn't. Could you reduce your program to the *minimal* size (<50 lines)
>that still has the problem and post the result?

I think so, too.  But I couldn't find where.

In my_process structure, I changed my_process_class* to void*
like this:
FROM:
    stypedef struct my_process
    {
        my_process_class*    mpProcess;
        my_process_flag*       mpFlag;
        long    mCount;
    } MY_PROCESS;

TO:
    stypedef struct my_process
    {
        void*                  mpProcess;
        my_process_flag*       mpFlag;
        long    mCount;
    } MY_PROCESS;

Whenever I need mpProcess, I cast it to my_process_class*.  With this change, everything works fine now.  It doesn't make
sense to me why my_process_class* works differently than void*.
Do you have any idea?  thank you.

.

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