C++ GUI with Qt4, Segmentaion Fault

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Hello everybody.
In chapter 02 of "C++ GUI Programming with Qt4, 2nd edition" is an example which when I implemented, compiled and run it, give me an error about segmentation fault.
I uploaded all the codes at : http://ubuntuone.com/1BwwCaFw9801KfL39I7cA6[^] (about 22 Kb)
Thanks a lot of everybody who would help me ...

Posted 5-Jul-13 14:18pm

smss IR

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The_Inventor 6-Jul-13 4:42am

Often these books will have 'errors' so that you will have to do some coding=work. Read the material again.

smss IR 6-Jul-13 9:56am

I read it for tertiary again! but doesn't have any inconsistency with the written codes by me.

Matthew Faithfull 6-Jul-13 5:22am

Use the debugger to determine where the segmentation fault is happening, which file, which function, which line if you can. If that doesn't allow you to fix the problem it will help someone to help you.

smss IR 6-Jul-13 9:56am

Thanks man.

Richard MacCutchan 6-Jul-13 6:32am

If you aspire to be a developer then you need to learn not to give up so easily. Make an effort to at least find the line of code that is failing, so you can provide some useful detail about your problem. And finally, understand that no one is going to download this code and debug it for you.

smss IR 6-Jul-13 9:56am

Thanks Richard.

smss IR 6-Jul-13 10:18am

I debugged it, and I understand where is the code which having the error.
That error is in : "//layout()->setSizeConstraint(QLayout::SetFixedSize);" which when I commented it, program run as successfully.
What is the problem?
Thanks everybody.

pasztorpisti 6-Jul-13 17:01pm

It can crash either in the layout() call, in the setSizeContstrain() call, or simply because the pointer returned by layout() is NULL. I would start by logging/debugging out the pointer returned by layout() because doing so you would be able to decide which of the 3 cases can cause the problem.

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KarstenK · Accepted Answer · 2013-07-09T03:57:00

Solution 1

use the debugger to find the exact crash location. And than search for working sample code of that piece.

Posted 9-Jul-13 3:57am

KarstenK