Firefox crush when try to show dialog from Qt GUI library (Linux ubuntu)

[barak]

Hello,

I have Qt GUI library which shows dialogs such as login. We use it with Firefox which calls the Qt library that should show a dialog. But at this point Firefox is closed with segmantation error.

I can use my Qt GUI library from non-Qt application by providing the QApplication inside the library and it works. I have the GTK 2.0 installed.

Thanks for any help you provide.

Barak

[tbscope]

That's way too few information to give a good answer.

So, install and/or rebuild the respective packages (firefox, qt, etc...) with debug information.
Then run it all through gdb and get a backtrace. Using the backtrace you can already see where the problem might be. If not, use the information to step through the program and look at the registers and variables.

A segmentation fault happens when you try to access memory you're not supposed to access (like in an uninitialized pointer)

[barak]

Thanks. How do I add debug information to my Qt library? Could it be related to the gtk-qt?

[barak]

OK it is crashing when I create the QApplication object:



QApplication * a = new QApplication(NULL,NULL);

[wysota]

Passing it two nulls is probably what's causing the crash. You can't pass arbitrary values to objects and expect them to work.

[barak]

The full code is:


QApplication * a = 0;
if (!qApp){

int argc = 1;

char *argv[] = { "asePinDialog", NULL };

a = new QApplication(argc,argv);

//QApplication b(argc,argv);

}


m_iLastSlotId = aseData.slotID;

ChangePin *pinDlg = new ChangePin(aseData);

m_pOpenDialog = pinDlg;

pinDlg->exec();
//pinDlg->show();


bool bRet = (pinDlg->result() == QDialog::Accepted);

delete pinDlg;

m_pOpenDialog = NULL;

m_iLastSlotId = 0;

if(a){

a->exit();

delete a;

a = 0;

}

return bRet;