GSoC '21 KMyMoney : I am stuck.

[Suraj Kumar Mahto]

> Look at the local variables. What is the value of 'this'? Does that make
sense?
> It chokes inside the method AlkOnlineQuotesProfile::type() which gets
called
> from AlkOnlineQuoteSource ctor in line 230. Which object is pointed to
when
> calling type()? Which value does this pointer have? Where is it
initialized?

After days of bug hunting, I couldn't figure out that. The following things
I did for the same.
- I stepped in through functions in debugging and checked the stack.
- Tried to study the QMap related function defaultQuoteSources() and
checked its usage.
- While experimenting with the alkimia lib I found that after executing the
onlinequoteseditor5 binary separately(in build/bin/) the widget works fine
and there is no crash while interacting with the UI like buttons and fields
as opposed to what I saw in the kmymoney.

Please direct me what thing I missed. Thanks.
Sorry for the delay in the blog post. I planned for week 1-2 blog by Monday
only. I thought that I will post that after solving this bug.

Regards
Suraj Kumar Mahto

On Wed, Jun 16, 2021 at 10:31 PM Thomas Baumgart <thb at net-bembel.de> wrote:

>
> On Mittwoch, 16. Juni 2021 18:32:42 CEST Suraj Kumar Mahto wrote:
>
> > > This may depend on what you are doing to get to the crash. I simply
> open
> > > the online quotes settings and press the New button at the top of that
> > > dialog and immediately get the crash. Doing so, I could trace back the
> > > problem to a nullptr assignment.
> > Hello,
> > I guess the problem starts with this line
> > main.cpp:351  const int rc = a.exec();
> > exec() is a qt function so that shouldn't be creating the problem and I
> am
> > unable to find which null pointer assignment is creating the segmentation
> > fault.
> >
> > > Not knowing your environment it is hard to comment on this. I do my
> > > debugging mainly in KDevelop and don't have problems with a freezing
> > > application.
> >
> > I am using KDevelop. I figured out that, it works fine now.
>
> Let the application run in KDevelop's Debug mode. At some point it will
> crash. This will let you inspect the state (variables, backtrace, etc.)
> of the application.
>
> Look at the local variables. What is the value of 'this'? Does that make
> sense?
> It chokes inside the method AlkOnlineQuotesProfile::type() which gets
> called
> from AlkOnlineQuoteSource ctor in line 230. Which object is pointed to when
> calling type()? Which value does this pointer have? Where is it
> initialized?
>
> These are the questions you want to answer and then walk the stack
> backwards.
>
>
> --
>
> Regards
>
> Thomas Baumgart
>
> https://www.signal.org/       Signal, the better WhatsApp
> -------------------------------------------------------------
> "The flame that burns twice as bright
> burns half as long." ― Lao Tzu, Te Tao Ching
> -------------------------------------------------------------
>
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