Hi,

winId() crashed once in a while on memory allocation from one of my function(Can not simulate this problem).
I have no idea why.
We just switched to QT-4.7.1 and it doesn't happen with the old version, QT-4.2.3 .

Can someone help me?
Below you can see the printout of the debugger.

Thanks
Jacob


(gdb) backtrace
#0 0x0000000000ae35e0 in vtable for __cxxabiv1::__si_class_type_info ()
#1 0x00002b01eef4e7ed in QWidget::isActiveWindow() const () from /usr/Local/Qt-4.7.1/lib/libQtGui.so.4
#2 0x00002b01eef4ed65 in QWidget:alette() const () from /usr/Local/Qt-4.7.1/lib/libQtGui.so.4
#3 0x00002b01eef9aaf4 in QWidgetPrivate::updateSystemBackground() () from /usr/Local/Qt-4.7.1/lib/libQtGui.so.4
#4 0x00002b01eef54d6e in QWidget::create(unsigned long, bool, bool) () from /usr/Local/Qt-4.7.1/lib/libQtGui.so.4
#5 0x00002b01eef556e8 in QWidgetPrivate::createWinId(unsigned long) () from /usr/Local/Qt-4.7.1/lib/libQtGui.so.4
#6 0x00002b01eef556e8 in QWidgetPrivate::createWinId(unsigned long) () from /usr/Local/Qt-4.7.1/lib/libQtGui.so.4
#7 0x00002b01eef556e8 in QWidgetPrivate::createWinId(unsigned long) () from /usr/Local/Qt-4.7.1/lib/libQtGui.so.4
#8 0x00002b01eef556e8 in QWidgetPrivate::createWinId(unsigned long) () from /usr/Local/Qt-4.7.1/lib/libQtGui.so.4
#9 0x00002b01eef556e8 in QWidgetPrivate::createWinId(unsigned long) () from /usr/Local/Qt-4.7.1/lib/libQtGui.so.4
#10 0x00002b01eef556e8 in QWidgetPrivate::createWinId(unsigned long) () from /usr/Local/Qt-4.7.1/lib/libQtGui.so.4
#11 0x00002b01eef556e8 in QWidgetPrivate::createWinId(unsigned long) () from /usr/Local/Qt-4.7.1/lib/libQtGui.so.4
#12 0x00002b01eef556e8 in QWidgetPrivate::createWinId(unsigned long) () from /usr/Local/Qt-4.7.1/lib/libQtGui.so.4
#13 0x00002b01eef556e8 in QWidgetPrivate::createWinId(unsigned long) () from /usr/Local/Qt-4.7.1/lib/libQtGui.so.4
#14 0x00002b01eef556e8 in QWidgetPrivate::createWinId(unsigned long) () from /usr/Local/Qt-4.7.1/lib/libQtGui.so.4
#15 0x00002b01eef556e8 in QWidgetPrivate::createWinId(unsigned long) () from /usr/Local/Qt-4.7.1/lib/libQtGui.so.4
#16 0x00002b01eef556e8 in QWidgetPrivate::createWinId(unsigned long) () from /usr/Local/Qt-4.7.1/lib/libQtGui.so.4
#17 0x00002b01eef556e8 in QWidgetPrivate::createWinId(unsigned long) () from /usr/Local/Qt-4.7.1/lib/libQtGui.so.4
#18 0x00002b01eef556e8 in QWidgetPrivate::createWinId(unsigned long) () from /usr/Local/Qt-4.7.1/lib/libQtGui.so.4
#19 0x00002b01eef556e8 in QWidgetPrivate::createWinId(unsigned long) () from /usr/Local/Qt-4.7.1/lib/libQtGui.so.4
#20 0x00002b01eef5579e in QWidget::winId() const () from /usr/Local/Qt-4.7.1/lib/libQtGui.so.4
#21 0x00002b020470d616 in LiveVideoWidgetXv::displayFrameImpl (this=0xb7303d0, frame=0xa3e43a0, grabber_thread=true) at ...