.NET Framework - Zero length literal string is not zero length

Asked By David Liebtag

19-Nov-09 11:25 PM

I have a program that does this:

HWND Edit =
CreateWindow("Edit","",WS_VISIBLE,0,0,100,100,Parent,0,Instance,0) ;

When the window appears, it is not empty.  Instead, it contains the numeric
digit 0.

The problem only happens when I compile with debug.

I have had this kind of thing happen before where empty literal strings are
not empty.  It seems to be related to the stack.  Sometimes when I have the
problem, I can work around it by moving local variables.

Does anyone know exactly what causes this and/or what I can do about it?

Thanks in advance.

David Liebtag

PS I am using Visual Studio .Net 2003 C++.  I know, I know.  VS .Net 2003 is
old, but it is what I am using.  After all, Microsoft still offers extended
support for it,,,

20-Nov-09 04:37 AM

David,

This is not the best group for this question, however...


What else do you do with the Edit window handle? Nothing in creating
the window would result in it displaying a '0'.


You've probably got a bug somewhere - not where you think it is.
Enable the compiler run-time checking settings and see if they show
anything.

Dave

20-Nov-09 10:08 AM

Can you suggest a better group?

I have already enabled all the run-time checking and no errors are reported.

David Liebtag

20-Nov-09 11:00 AM

You were correct.  I found that the code to initialize a global array was
running off the end and corrupting the storage for literal strings.

Thanks.

David Liebtag

20-Nov-09 01:30 PM

The vc.language group may have been better - given the outcome.

Dave