QGIS » QGIS Application

For now we don't maintain backward compatibility of project files between different QGIS versions, thus situation like this is possible.

I think this might be solved by issuing a warning "your project file is for older version, problems possible".

I've added such a warning (). It currently only appears on the terminal as the project reading code is supposed to be gui independent so can't produce a warning dialog box.

However, if the project file loaded mostly ok, the saving shouldn't then crash. Your .qgs file is quite long and includes lots of layers - are you able to try progressively removing layers to see which layer causes the crash when saving?

The layer causing the problem is the vector point layer "points.shp". It does not appear when I open the project, and trying to open its properties causes QGIS to crash.

Loading the layer in a new project in .8 and then saving the project doesn't cause a crash.

Here's a backtrace for the save:
(gdb) bt
#0  0xb6d7b0e9 in [[QgsVectorLayer]]::writeXML_ () from /usr/lib/libqgis_gui.so.0
#3905  0xb6ccd8f8 in [[QgsMapLayer]]::writeXML () from /usr/lib/libqgis_gui.so.0
#3906  0xb6cca02c in [[QgsMapCanvas]]::writeXML () from /usr/lib/libqgis_gui.so.0
#3907  0xb6d19ac0 in [[QgsProject]]::write () from /usr/lib/libqgis_gui.so.0
#3908  0xb6c49c5a in [[QgisApp]]::fileSaveAs () from /usr/lib/libqgis_gui.so.0
#3909  0xb6dbfa69 in [[QgisApp]]::qt_metacall () from /usr/lib/libqgis_gui.so.0
#3910  0xb7e542bd in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#3911  0xb7e544e9 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#3912  0xb765b069 in QAction::triggered () from /usr/lib/libQtGui.so.4
#3913  0xb765ba07 in QAction::activate () from /usr/lib/libQtGui.so.4
#10 0xb78b7461 in QMenu::wheelEvent () from /usr/lib/libQtGui.so.4
#3914 0xb78ba95f in QMenu::mouseReleaseEvent () from /usr/lib/libQtGui.so.4
#3915 0xb769eeec in QWidget::event () from /usr/lib/libQtGui.so.4
#3916 0xb78b4a13 in QMenu::event () from /usr/lib/libQtGui.so.4
#3917 0xb765f7c5 in QApplicationPrivate::notify_helper ()
   from /usr/lib/libQtGui.so.4
#3918 0xb7660a5a in QApplication::notify () from /usr/lib/libQtGui.so.4
#3919 0xb76b2837 in QApplication::x11ProcessEvent () from /usr/lib/libQtGui.so.4
#3920 0xb76b1568 in QApplication::x11ProcessEvent () from /usr/lib/libQtGui.so.4
#3921 0xb76c284e in non-virtual thunk to QDesktopWidget::~QDesktopWidget() ()
   from /usr/lib/libQtGui.so.4
#3922 0xb7e4668a in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#3923 0xb7e4689d in QEventLoop::exec () from /usr/lib/libQtCore.so.4
---Type <return> to continue, or q <return> to quit---
#3924 0xb7e48fe7 in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#3925 0xb765f565 in QApplication::exec () from /usr/lib/libQtGui.so.4
#3926 0x0804c488 in main ()

Here's a backtrace from trying to open the layer's properties window:
(gdb) bt
#0  0xb6d9efb8 in [[QgsVectorLayerProperties]]::reset ()
   from /usr/lib/libqgis_gui.so.0
#3905  0xb6d9fee3 in [[QgsVectorLayerProperties]]::QgsVectorLayerProperties ()
   from /usr/lib/libqgis_gui.so.0
#3906  0xb6d8a6ed in [[QgsVectorLayer]]::showLayerProperties ()
   from /usr/lib/libqgis_gui.so.0
#3907  0xb7f5c746 in [[QgsLegend]]::legendLayerShowProperties ()
   from /usr/lib/libqgis_legend.so.0
#3908  0xb7f6e3f1 in [[QgsLegend]]::qt_metacall () from /usr/lib/libqgis_legend.so.0
#3909  0xb7e662bd in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#3910  0xb7e664e9 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#3911  0xb766d069 in QAction::triggered () from /usr/lib/libQtGui.so.4
#3912  0xb766da07 in QAction::activate () from /usr/lib/libQtGui.so.4
#3913  0xb78c9461 in QMenu::wheelEvent () from /usr/lib/libQtGui.so.4
#10 0xb78cc95f in QMenu::mouseReleaseEvent () from /usr/lib/libQtGui.so.4
#3914 0xb76b0eec in QWidget::event () from /usr/lib/libQtGui.so.4
#3915 0xb78c6a13 in QMenu::event () from /usr/lib/libQtGui.so.4
#3916 0xb76717c5 in QApplicationPrivate::notify_helper ()
   from /usr/lib/libQtGui.so.4
#3917 0xb7672a5a in QApplication::notify () from /usr/lib/libQtGui.so.4
#3918 0xb76c4837 in QApplication::x11ProcessEvent () from /usr/lib/libQtGui.so.4
#3919 0xb76c3568 in QApplication::x11ProcessEvent () from /usr/lib/libQtGui.so.4
#3920 0xb76d484e in non-virtual thunk to QDesktopWidget::~QDesktopWidget() ()
---Type <return> to continue, or q <return> to quit---
   from /usr/lib/libQtGui.so.4
#3921 0xb7e5868a in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#3922 0xb7e5889d in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#3923 0xb78cabd3 in QMenu::exec () from /usr/lib/libQtGui.so.4
#3924 0xb7f61fd1 in [[QgsLegend]]::handleRightClickEvent ()
   from /usr/lib/libqgis_legend.so.0
#3925 0xb7f6375d in [[QgsLegend]]::mousePressEvent ()
   from /usr/lib/libqgis_legend.so.0
#3926 0xb76b0f05 in QWidget::event () from /usr/lib/libQtGui.so.4
#3927 0xb789db84 in QFrame::event () from /usr/lib/libQtGui.so.4
#3928 0xb79118c4 in QAbstractScrollArea::viewportEvent ()
   from /usr/lib/libQtGui.so.4
#3929 0xb7964159 in QAbstractItemView::viewportEvent ()
   from /usr/lib/libQtGui.so.4
#3930 0xb7910705 in QAbstractScrollArea::minimumSizeHint ()
   from /usr/lib/libQtGui.so.4
#3931 0xb76717c5 in QApplicationPrivate::notify_helper ()
   from /usr/lib/libQtGui.so.4
#3932 0xb7672a5a in QApplication::notify () from /usr/lib/libQtGui.so.4
#3933 0xb76c3e7d in QApplication::x11ProcessEvent () from /usr/lib/libQtGui.so.4
#3934 0xb76c3568 in QApplication::x11ProcessEvent () from /usr/lib/libQtGui.so.4
#3935 0xb76d484e in non-virtual thunk to QDesktopWidget::~QDesktopWidget() ()
   from /usr/lib/libQtGui.so.4
---Type <return> to continue, or q <return> to quit---
#3936 0xb7e5868a in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#3937 0xb7e5889d in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#3938 0xb7e5afe7 in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#36 0xb7671565 in QApplication::exec () from /usr/lib/libQtGui.so.4
#37 0x0804c488 in main ()

Are you able to attach the points.shp file?

It does not crash for me, even when opening a project created in 0.7.4 in 0.8 with the point shapefile. The content is not ok, but this does not matter since there is no backward compatibility anyway.

Milestone Version 0.8 deleted