Re: Exception when deleting pointer in a struct

From:
"Ajay Kalra" <ajaykalra@yahoo.com>
Newsgroups:
microsoft.public.vc.mfc
Date:
3 Aug 2006 10:51:46 -0700
Message-ID:
<1154627506.589831.229820@m79g2000cwm.googlegroups.com>
PaulH wrote:

I have a program with a structure object that looks like this:

typedef struct _MyStruct {
    CString Name;
    CString Path;
    CMyObj *pObj;
    HINSTANCE hModule;
}MyStruct;

I then initialize it as below:

func()
{
    MyStruct item;
    item.pObj = new CMyObj();
    item.Name = _T("Some Name");
    item.Path = _T("Some Path");
    item.hModule = AfxLoadLibrary(_T("Mylib.dll"));

    if (!VerifySomething())
    {
        //unload and cleanup
        delete item.pObj; //Exception occurs here
        AfxFreeLibrary(item.hModule);
    }
}

But, when I do the "delete item.pObj;" call, I sometimes (not always)
get an exception. This only happens in release mode, not in debug.

Does anybody know what's going on here?

Thanks,
 PaulH


As Ali pointed out, put a constructor to initialize the data. Although
I am not certain that will help as you are initializing the data.
Another point, if VerifySomething fails, you will have a memory leak as
item.pObj will not be delted. You should do this in destructor. Make
your struct a class with constructor/destructor where you initialize
and new/delete memory.

---
Ajay

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