Mysterious values in IDE when debugging

[Alfonzo Morra]

Hi,

I recently started using VC7.1 (upgraded from VC6). I've noticed that
when stepping through code, some of the values of my variables make no
sese at all. For instance, I had some code like this:

int i = 1, j =1 ;
for ( MyClass::Result Type::const_ite rator ResultIt =
ShowAll.getResu lts().begin(); ResultIt != ShowAll.getResu lts().end();
++ResultIt, i++ ) {
.......
cout << "Value of i is : " << i << endl ;


When I hovered my mouse ptr over the variable i, in the 'for'
expression, I got a nonsensical number: 2012749653 - however the value
printed on the console was correct.

When I "dragged" the variable named i to the watch window, I got the ff
error message: "i CXX0069: Error: variable needs stack frame", and this
was still within the for loop, so the i variable must have still been on
the stack - any body care to shed some light on wtf is going on?

Thanks

[David Lowndes]

Re: Mysterious values in IDE when debugging

>I recently started using VC7.1 (upgraded from VC6). I've noticed that[color=blue]
>when stepping through code, some of the values of my variables make no
>sese at all. For instance, I had some code like this:
>...
>When I hovered my mouse ptr over the variable i, in the 'for'
>expression, I got a nonsensical number: 2012749653 - however the value
>printed on the console was correct.[/color]

Alfonzo,

Are you debugging a release optimised build rather than the debug
non-optimised build? The results you mentioned are typical when
debugging optimised builds.

Dave

[Alfonso Morra]

Re: Mysterious values in IDE when debugging



David Lowndes wrote:
[color=blue][color=green]
>>I recently started using VC7.1 (upgraded from VC6). I've noticed that
>>when stepping through code, some of the values of my variables make no
>>sese at all. For instance, I had some code like this:
>>...
>>When I hovered my mouse ptr over the variable i, in the 'for'
>>expression, I got a nonsensical number: 2012749653 - however the value
>>printed on the console was correct.[/color]
>
>
> Alfonzo,
>
> Are you debugging a release optimised build rather than the debug
> non-optimised build? The results you mentioned are typical when
> debugging optimised builds.
>
> Dave[/color]

Hi Dave,

Thanks for reply - but no, this was my own code that I was running in
debug mode.

[David Lowndes]

Re: Mysterious values in IDE when debugging

>> Are you debugging a release optimised build rather than the debug[color=blue][color=green]
>> non-optimised build? The results you mentioned are typical when
>> debugging optimised builds.
>>[/color]
>Thanks for reply - but no, this was my own code that I was running in
>debug mode.[/color]

Have you checked the compiler optimisation setting is set to /Od for
the source file(s)/project in question?

Dave
--
MVP VC++ FAQ: http://www.mvps.org/vcfaq