Bug in qabstractitemmodel?

[stalep]

hi, im working on a simple maemo media application. its located here: https://garage.maemo.org/projects/womp/.
untill now ive been programming mostly in qtcreator and only tested natively on linux. today i tested the app in scratchbox, it compiles without any trouble, but when i test it i get an error i havent seen when ive tested on linux.

ASSERT: "last >= first" in file kernel/qabstractitemmodel.cpp, line 2110
/usr/bin/run-standalone.sh: line 11: 23645 Aborted                 (core dumped) "$@"

this happens when i try to clear a subclass of qabstracttablemodel with an overrided method called removeRows (mostly taken from an qtexample). the class can be found here:
https://garage.maemo.org/plugins/scm...mp&view=markup
this is the overrided method:

 bool TrackTableModel::removeRows(int position, int rows, const QModelIndex &index)
 {
     Q_UNUSED(index);
     beginRemoveRows(QModelIndex(), position, position+rows-1);

//     trackList.clear();

     for (int row=0; row < rows; ++row) {
         trackList.removeAt(position);
     }

     endRemoveRows();
     return true;
 }

i believe that its the beginRemowRows(..) method thats responsible, but im not sure. again, this works perfectly on linux.
so im wondering if im doing something fundamentally wrong, or if this is in fact a bug.

is phonon expected to work in scratchbox btw? i tried on both armel and x86 and it fails to play any tracks (different reason why it fails).

another question. do you recommend that i use "standard" qt classes or should i use maemo specific qt classes. if so, are there any code examples on how these are used?

sorry if this have been answered before, i tried to search but couldnt find much.

[divanov]

It doesn't compile for me:

g++ -c -pipe -g -Wall -W -D_REENTRANT -DQT_PHONON_LIB -DQT_XMLPATTERNS_LIB -DQT_GUI_LIB -DQT_NETWORK_LIB -DQT_CORE_LIB -DQT_SHARED -I/usr/share/qt4/mkspecs/linux-g++ -I. -I/usr/include/qt4/QtCore -I/usr/include/qt4/QtNetwork -I/usr/include/qt4/QtGui -I/usr/include/qt4/QtXmlPatterns -I/usr/include/qt4/phonon -I/usr/include/qt4 -I. -I../../gsoap-2.7.15-bin/include -I../bin/tmp -o ../bin/tmp/main.o main.cpp
Assembler messages:
Fatal error: can't create ../bin/tmp/main.o: No such file or directory
In file included from ./ws/soapH.h:10,
                 from ./ws/soapMusicWSBindingProxy.h:10,
                 from ws/wsmanager.h:16,
                 from womp.h:7,
                 from main.cpp:4:
./ws/soapStub.h:17:22: error: stdsoap2.h: No such file or directory

Because you included gsoap into source tree. I will try to fix it.

[stalep]

hi, in the readme ive documented how its compiled with womp. we did it this way since we couldnt find any packages for gsoap in the maemo repos.

though it wont be possible for you to test the actual program without an existing wimp account (which is only for norwegian citizens) unfortunately.

i can probably create a testprogram to verify it if needed.

[divanov]

Patch to fix packaging problem.

Index: src/src.pro
===================================================================
--- src/src.pro	(revision 14)
+++ src/src.pro	(working copy)
@@ -78,8 +78,5 @@
     phonon \
     xmlpatterns
 DEPENDPATH += .
-INCLUDEPATH += . \
-    ../../gsoap-2.7.15-bin/include
-LIBS += -L../../gsoap-2.7.15-bin/lib \
-    -lgsoap++
+LIBS += -L/usr/lib/ -lgsoap++
 DESTDIR = bin

Also you need to build gsoap package and install it inside scratchbox.

[divanov]

That was very really wrong. I was able to port gsoap to Maemo in 5 minutes.

hi, in the readme ive documented how its compiled with womp. we did it this way since we couldnt find any packages for gsoap in the maemo repos.

[stalep]

That was very really wrong. I was able to port gsoap to Maemo in 5 minutes.

can you explain how?

[divanov]

can you explain how?

Just build and install package in scratchbox:

http://www.mediafire.com/file/unkqww...5l-0.1.diff.gz
http://www.mediafire.com/file/nzorkh....7.15l-0.1.dsc
http://www.mediafire.com/file/mynmjf...5l.orig.tar.gz

P.S. I've never used this file sharing service before, let's hope it will work.

[divanov]

What we have in QAbstractItemModel:

void QAbstractItemModel::beginRemoveRows(const QModelIndex &parent, int first, int last)
{
    Q_ASSERT(first >= 0);
    Q_ASSERT(last >= first);

In womp code:

 bool TrackTableModel::removeRows(int position, int rows, const QModelIndex &index)
 {
     Q_UNUSED(index);
     beginRemoveRows(QModelIndex(), position, position+rows-1);

And finally how it's called:

     removeRows(0, trackList.size(), QModelIndex());

Then think about the case when trackList.size() is 0?

[stalep]

Then think about the case when trackList.size() is 0?

ah, thanks a lot. didnt see that one. since it worked on linux i thought it was a bug in the maemo port. ill test it tomorrow. again, thanks! :)

[divanov]

ah, thanks a lot. didnt see that one. since it worked on linux i thought it was a bug in the maemo port. ill test it tomorrow. again, thanks!

I guess the reason for that is currently on Maemo Qt is compiled with -debug option.

[divanov]

gsoap is available in extras-devel repository:
http://maemo.org/packages/view/gsoap/