Gnome makes application crash

the debugger stops at the line

QColor changed = QColorDialog::getColor(Qt::white);

I can not step in to the code anymore

In the status I see no code at ......

when I press continue program the dialog pops up
when I press OK the program exits

regix

Quote:

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Originally Posted by regix

I can not step in to the code anymore

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Did you try to set a breakpoint after that line?

Yes I put a breakpoint at
QPixmap colpixmap(30,30);
the application continued through the changeTitleColor function
then I arrived at shared.h
deref...
and it went to
bool DlgEditCssBase::qt_invoke( int _id, QUObject* _o )
where it returned true
then I could not step further inside
I jumped out of the function
and arrived at
return qApp.exec();

regix

Quote:

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Originally Posted by regix

the application continued through the changeTitleColor function

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This is a bit weird. I've checked Qt 3.3.5 sources and it seems that QColorDialog doesn't use anything specific to GNOME.

What signal triggers EditCSSDlg::changeTitleColor()? Is it connected to any other slot?

Also check the attachment. I have modified the test program, so that the color dialog is invoked from a modal dialog.

dlgeditcssbase.cpp :
connect( pushButtonColor, SIGNAL( clicked() ), this, SLOT( changeTitleColor() ) );

void DlgEditCssBase::changeTitleColor()
{
qWarning( "DlgEditCssBase::changeTitleColor(): Not implemented yet" );
}
dlgeditcssbase.h:
virtual void changeTitleColor();

dlgeditcss.h
virtual void changeTitleColor();

there are no other slots connected to this signal

regix

Quote:

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Originally Posted by regix

there are no other slots connected to this signal

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Then maybe you should try to isolate the problem by stripping down your application?

Also check if it works with Qt 3.3.6 (although I didn't find anything related to your problem in the changelog).

this is what I dit to trace the problem:

I commented everthing out inside changeTitleColor()
result : the application behaves normally

I comment out the line with QColorDialog
result : the application behaves normally

I comment everything out except for the line with QColorDialog
result : the application stops

The application that jacek posted worked fine.
I started it with gdb and it exited normally.

regix :eek:

Quote:

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Originally Posted by regix

The application that jacek posted worked fine.

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Does it still work if you replace:

Code:

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QColorDialog::getColor();

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with

Code:

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QColor changed = QColorDialog::getColor(Qt::white);

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?

As long as my application works, it might mean that the problem lies in your code, not in Qt.

I should ask it earlier, but do you use threads in your application?

g++ -c -pipe -O2 -fmessage-length=0 -Wall -D_FORTIFY_SOURCE=2 -g -DUSE_LIB64_PATHES -fno-strict-aliasing -Wall -W -g -O0 -DQT_SHARED -DQT_TABLET_SUPPORT -DQT_NO_DEBUG -DQT_THREAD_SUPPORT -I/usr/lib/qt3/mkspecs/default -I. -I/usr/include/Magick++ -I/usr/include/magick -I/usr/include -I/usr/lib/qt3/include -o editcssdlg.o editcssdlg.cpp
test -d ../bin/ || mkdir -p ../bin/

I had changed the changeTitleColor() function and compiled.
This is how the compiler compiles
The result remained the same : on GNOME the application stops
First I used a thread in my program, but later I decided not to use threads.

this is part of the .pro file :

LIBS += -lMagick \
-lMagick++
INCLUDEPATH += /usr/include/Magick++ \
/usr/include/magick
QMAKE_CXXFLAGS_DEBUG += -O0
TARGET = websitecreator
DESTDIR = ../bin
CONFIG += debug \
warn_on \
qt
TEMPLATE = app

Quote:

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Originally Posted by regix

The application that jacek posted worked fine.
I started it with gdb and it exited normally.

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Maybe it works only in gdb? :confused:

If you want I can send the source code and the kdevelop project file I am working with

I didn't test it with qt 3.3.6 as I have already installed two versions of qt and I wouldn't like this to clash with other applications.

regix

Quote:

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Originally Posted by regix

If you want I can send the source code and the kdevelop project file I am working with

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The problem is that I don't have GNOME installed.

I will try to put QColorDialogs in different parts of my application and see what that gives.

regix

I found out that in certain dialogs I can put a QColorDialog::getColor call while in others this would end the application.
This was not limited to QColorDialog. Also some of the dialogs I created myself showed a similar behaviour.
Typicaly this occurs when I put the dialog in a dialog that is instatiated in another dialog, which on its turn is instatiated in another dialog. I occurs to me that it has to do with the depth of dialogresult call or something like that.
As I said this behaviour is not seen in KDE.

regix

Quote:

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Originally Posted by regix

Typicaly this occurs when I put the dialog in a dialog that is instatiated in another dialog, which on its turn is instatiated in another dialog.

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That would be a quite weird bug. Check the attachment and see if it reproduces it.

I tested your application and it behaves correctly.
The only thing I can think of is that I have a weird bug in my application.

regix :o