[Interest] Can't Debug on Windows 7: Invalid parameter passed to C runtime

[Josiah Bryan]

On Wed, Jun 13, 2012 at 5:50 PM, André Pönitz <
andre.poenitz at mathematik.tu-chemnitz.de> wrote:

> On Wed, Jun 13, 2012 at 04:25:59PM -0400, Josiah Bryan wrote:
> > I'm attempting to debug an odd problem wherein my program (http://
> > code.google.com/p/dviz/) crashes when displaying certain UTF-8
> > strings. That's not really why I'm emailing - the problem I'd like
> > your help with is that I'm unable to run the program in "Debug" mode
> > in Qt Creator on Windows 7.
> >
> > I've set the project in Qt Creator to the "Debug" build and tried to
> > run it in the Debugger (F5). The program builds and launches -
> > however, before the main UI can appear, an error dialog titled
> > "Microsoft Visual C++ Runtime Library" appears giving the following
> > error: "This application has requested the Runtime to terminate in an
> > unusual way. Please contact the application's support team for more
> > information."
> >
> > Below the console output from Qt Creator. As you can guess, it does
> > run correctly in "Release" mode in Qt Creator (just crashes when the
> > user performs a certain UI action - hence why I want to run it in
> > Debug mode. Note that it does not crash on linux in gdb or in release
> > mode - so this is specific to Windows and the debugger in Qt Creator.)
>
> Assuming that the "release" mode takes roughly the same code path
> as the "debug" mode (i.e. no major #ifdef surgery in your code),
> the problems that are indicated by the output
>
>    QObject: Cannot create children for a parent that is in a different
>     thread. [...]
>
>    QCoreApplication::applicationFilePath: Please instantiate the
>     QApplication object first [...]
>
>    QWidget: Must construct a QApplication before a QPaintDevice
>
>    Invalid parameter passed to C runtime function.
>
> They would exist in "release" mode as well. So it does not run
> "correctly" there, rather "by accident".
>

I just looked at the thread errors - that's a problem in Qt's codebase,
specifically inside Phonon - I don't create any threads at the spot it's
complaining about.
http://code.google.com/p/dviz/source/browse/trunk/src/phonon/NativeViewerPhonon.cpp
-
but I do create several Phonon objects which could (very likely) create
threads internally.

If I could only figure out where the QWidget error (above) is coming from
and the QCoreApplication::applicationFilePath error is from - that would be
helpful. Heck, I don't even call applicationFilePath once in my entire
codebase - so that's somewhere in Qt again.

Yes, I do use QWidgets (duh :-) but tracking down *which* call to a new
QWidget caused the above error - that's the rub.
-Josiah
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