Multiple window / form application. QFileDialog crashes

[ramzes13]

Dear all,

I am writing a GUI application for image processing. I have three windows (please see attached image):
1. Main GUI.
2. Window for displaying 2D image
3. Window to draw a simple graph
All windows were drawn using Qt Creator 2.0.0 based on Qt 4.7.0 (32bit).

Currently, I am creating windows 2 and 3 inside Main GUI by using new and delete commands.
However, I have a problem: the program crashes sometimes (randomly) when I try to open file using
QFileDialog newdialog(this);
newdialog.setReadOnly(true);
QString path = newdialog.getOpenFileName(this, tr("Open File"), filename);
It is not reproducible, sometimes it crashes on third time of usage, sometimes on fifths. Thus, I cant not understand what is wrong.

Could anybody suggest what is the right way to handle multiple windows/forms?

Thank you for your help,
Roman

[tbscope]

The right way to handle this is a debugger.
Run your code in a debugger and look at the backtrace to see where the crash happened

[ramzes13]

The right way to handle this is a debugger.
Run your code in a debugger and look at the backtrace to see where the crash happened

Hi tbscope,
Thank you for your comment. Even so I was using debugger I did not backtrace the reason carefully. Just now I looked at it once more and found that I was trying to delete non allocated memory in the destructor of my data class:
if(input_2d_array) for(int i=0;i<size_x;i++) delete [] input_2d_array[i]; // size_x can be sometimes bigger than the actual size of input_2d_array[i]

Thanks again.
I will test it further and come back if there will be crashes again.