Re: thread crash...

[Marylene P. <mar...@ad...>]

As I said, I have debugged my program.
It crashes when I allocate an instance of QwtPlot. If I remove all=20
links to QwtPlot (anyway if I don't it crashes in the remaining ones),=20=

my software works again.
Are you still telling me that the problem doesn't come from Qwt ? :-???

I'm ready to believe it but it's harder to know where it comes from=20
then...

In fact, the worse is that when the application crashes, the=20
QApplication object is already created ! :-s

Any idea ???


Le 26 avr. 05, =E0 08:50, paul.floyd a =E9crit :

>> Hello,
>>
>> my application worked perfectly fine until I enabled thread
> support.
>> Without changing anything else, this lead my software to
> crash and say
>> "QPaintDevice : Must construct a QApplication before a
> QPaintDevice".
>> This comes from the use of qwt. As soon as I remove any link
> to the
>> qwt-using classes, my software gets to work again.
>> I only use QwtPlot inheriting classes.
>>
>> The first time I installed qwt I had disabled thread support
> because I
>> had compiled qt without. But since then, I have recompiled
> qt with
>> thread support. I forgot to recompile qwt with it, but as my
> software
>> didn't work, I did today, and unfortunately, it doesn't change
>> anything.
>>
>> So, anybody has an idea why this happens and what I can do
> against that
>> ?
>
> Salut
>
> My guess is that this is a problem with a static or global
> variable (or something like objects created in threads on
> startup but before a QApplication has been created).
>
> If you have a debug version of the Qt library, try putting a
> breakpoint on the line that contains the error, and look at
> the stack to see what is being created that causes the problem.
>
> A+
> Paul
>
>
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