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Problems with KComboBox and KColorButton

Ganymed

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1

Friday, February 25th 2005, 7:29pm

Problems with KComboBox and KColorButton

Hi,
there is a widget which contains a KColorCombo element. I construct it normally with

Source code

 
1

KC_Color = new KColorCombo(this);

But when I open the widget (it is subclassed from QDialog), it crashes with "segmentation fault". What do I do wrong?? I have included the file <kcolorcombo.h> and I have linked -lkdeui and -lkdecore . It compiles and links normally (I am using SuSE 9.1).
The same happens when I put a KColorButton into the widget. It is shown and when I put a color on it manually, I can see how the Button changes its color which it should show. But when I click it, the application crashes also with the message "segmentation fault".

Mathias

wysota

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2

Friday, February 25th 2005, 8:01pm

RE: Problems with KComboBox and KColorButton

Use the debugger (like gdb) to see where the crash occurs.
Live and let live - use the search engine.
"Use the docs Luke, use the docs!"

Ganymed

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3

Saturday, February 26th 2005, 11:43am

Hi,
gdb shows following:

Quoted


Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 1099130752 (LWP 5338)]
0x404ac9fa in KInstance::config () from /opt/kde3/lib/libkdecore.so.4


I don't really know what this could be...

wysota

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4

Saturday, February 26th 2005, 11:56am

Do a backtrace (bt)
Live and let live - use the search engine.
"Use the docs Luke, use the docs!"

Ganymed

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5

Saturday, February 26th 2005, 5:03pm

This is the result given by bt

Source code

 
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#0  0x404ac9fa in KInstance::config () from /opt/kde3/lib/libkdecore.so.4
#1  0x404ae212 in KGlobal::config () from /opt/kde3/lib/libkdecore.so.4
#2  0x404aeb22 in KGlobalSettings::showIconsOnPushButtons ()
   from /opt/kde3/lib/libkdecore.so.4
#3  0x402035b7 in KPushButton::readSettings () from /opt/kde3/lib/libkdeui.so.4
#4  0x4021cfab in KPushButton::init () from /opt/kde3/lib/libkdeui.so.4
#5  0x4021d1af in KPushButton::KPushButton () from /opt/kde3/lib/libkdeui.so.4
#6  0x4021d1f7 in KDialogBaseButton::KDialogBaseButton ()
   from /opt/kde3/lib/libkdeui.so.4
#7  0x4021d280 in (anonymous namespace)::SButton::append ()
   from /opt/kde3/lib/libkdeui.so.4
#8  0x4026d115 in KDialogBase::makeButtonBox ()
   from /opt/kde3/lib/libkdeui.so.4
#9  0x40290eef in KDialogBase::KDialogBase () from /opt/kde3/lib/libkdeui.so.4
#10 0x00000025 in ?? ()
#11 0x00000004 in ?? ()
#12 0xbfffe360 in ?? ()
#13 0xbfffe370 in ?? ()
#14 0xbfffe380 in ?? ()
#15 0x01ffe350 in ?? ()
#16 0x40362dbc in __JCR_LIST__ () from /opt/kde3/lib/libkdeui.so.4
#17 0xbfffe360 in ?? ()
#18 0xbfffe370 in ?? ()
---Type <return> to continue, or q <return> to quit---
#19 0xbfffe3a8 in ?? ()
#20 0x402a9ceb in KColorDialog::KColorDialog ()
   from /opt/kde3/lib/libkdeui.so.4
#21 0x40017a82 in ?? ()
#22 0x0831fee8 in ?? ()
#23 0x08394b60 in ?? ()
#24 0x0837ba98 in ?? ()
#25 0x080cc3b0 in ?? ()
#26 0x0837cbd8 in ?? ()
#27 0x00000000 in ?? ()
#28 0x083935a8 in ?? ()
#29 0x00000000 in ?? ()
#30 0x4034c814 in vtable for KDialogBase () from /opt/kde3/lib/libkdeui.so.4
#31 0x03400201 in ?? ()
#32 0x08382b50 in ?? ()
#33 0x00000001 in ?? ()
#34 0x00000000 in ?? ()
#35 0x03400201 in ?? ()
#36 0x00040019 in ?? ()
#37 0x040041e3 in ?? ()
#38 0x40c2b400 in av_ () from /usr/lib/libqt.so.3
#39 0x00000100 in ?? ()
#40 0x000000e6 in ?? ()
---Type <return> to continue, or q <return> to quit---
#41 0x000002ff in ?? ()
#42 0x00000218 in ?? ()
#43 0xffeeeeee in ?? ()
#44 0xffeeeeee in ?? ()
#45 0x0817a618 in ?? ()
#46 0x08179098 in ?? ()
#47 0x00000000 in ?? ()
#48 0x08379708 in ?? ()
#49 0x00000000 in ?? ()
#50 0x00000000 in ?? ()
#51 0x08394440 in ?? ()
#52 0xbfffe4a0 in ?? ()
#53 0x00000000 in ?? ()
#54 0x00000000 in ?? ()
#55 0x00000000 in ?? ()
#56 0x00000000 in ?? ()
#57 0x08393d70 in ?? ()
#58 0x00000000 in ?? ()
#59 0x080bc0a0 in ?? ()
#60 0x080bc0a0 in ?? ()
#61 0x080bc0a0 in ?? ()
#62 0x00000000 in ?? ()
#63 0x00000000 in ?? ()
---Type <return> to continue, or q <return> to quit---
#64 0x00000020 in ?? ()
#65 0x083926b8 in ?? ()
#66 0x08394b60 in ?? ()
#67 0xbfffe4d0 in ?? ()
#68 0xbfffe4f8 in ?? ()
#69 0x4000ca40 in _dl_runtime_resolve () from /lib/ld-linux.so.2
#70 0x402ae15d in KColorButton::chooseColor () from /opt/kde3/lib/libkdeui.so.4
Previous frame inner to this frame (corrupt stack?)

wysota

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6

Saturday, February 26th 2005, 5:22pm

Hmm... You either have an incorrectly compiled program (try make clean && make) or you have a problem with some icons or settings.
Live and let live - use the search engine.
"Use the docs Luke, use the docs!"

Ganymed

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7

Saturday, February 26th 2005, 6:39pm

My program is compiled properly. I have tried to do make clean and make. But the error occurs on SuSE 9.1 and on Gentoo. The code cannot be wrong because I only construct it as described. The point is, that the error only occurs, when I click on the button. I try to get out, what message gdb gives when I use a KColorCombo, perhaps another.

I try to write an app which contains only a KColorCombo to look whether it depends on my app or on missing components, as you said.

anda_skoa

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8

Wednesday, March 2nd 2005, 2:17pm

Maybe your are having a QApplication instance instead of KApplication

Cheers,
_
Qt/KDE Developer
Debian User

Ganymed

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9

Wednesday, March 2nd 2005, 5:37pm

Thats right, I have a pure Qt-Application. Is this wrong? How can I "repair" this without modifying THE WHOLE app? I thought, that this would be no problem, because KColorCombo is subclassed from QComboBox.

anda_skoa

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10

Saturday, March 5th 2005, 4:03pm

You don't have to modify the whole app, you just need to create KApplications instead of QApplication in main.cpp.

But maybe it is sufficient to just create a KInstance instance.

Cheers,
_
Qt/KDE Developer
Debian User