Hi;
I am trying to execute following code in order to read a char string from a tree branch. The code works fine on CINT but same code when execute inside QT based interface generates a segment fault.
{
#include
gSystem->Load(“libNeuron.so”);
TFile f (“Test.root”);
TTree* dbTree = SynapseTree;
TBranch* bb = dbTree->GetBranch(“ConnectionName”);
int count =
bb->GetEntries();
char* n ="";
bb->SetAddress(n);
for (int j=0;j<count;j++){
bb->GetEntry(j);
std::cout<<n<<std::endl;
}
}
Note that dbTree->Scan(“ConnectionName”) works fine.
Also inside the same QT GUI I am able to list the tree branches (Image attached).
The error is
*** Break *** segmentation violation
Generating stack trace…
0xb65e8dbf in TLeafC::ReadBasket(TBuffer&) + 0x1b from /Library/root/lib/libTree.so
0xb65c720b in TBranch::ReadLeaves(TBuffer&) + 0x2f from /Library/root/lib/libTree.so
0xb65c6395 in TBranch::GetEntry(long long, int) + 0x261 from /Library/root/lib/libTree.so
0x080534ac in MainForm::databaseView_doubleClicked(QListViewItem*, QPoint const&, int) + 0x660 from ./neobase
0x08068ad2 in MainForm::qt_invoke(int, QUObject*) + 0x1ca from ./neobase
0xb58ab386 in QObject::activate_signal(QConnectionList*, QUObject*) + 0x13a from /Library/qt-x11-free-3.3.5/lib/libqt-mt.so.3
0xb5b91ea8 in QListView::doubleClicked(QListViewItem*, QPoint const&, int) + 0xb4 from /Library/qt-x11-free-3.3.5/lib/libqt-mt.so.3
0xb597442f in QListView::contentsMouseDoubleClickEvent(QMouseEvent*) + 0x13b from /Library/qt-x11-free-3.3.5/lib/libqt-mt.so.3
0xb599e53d in QScrollView::viewportMouseDoubleClickEvent(QMouseEvent*) + 0x89 from /Library/qt-x11-free-3.3.5/lib/libqt-mt.so.3 0xb599de46 in QScrollView::eventFilter(QObject*, QEvent*) + 0xfa from /Library/qt-x11-free-3.3.5/lib/libqt-mt.so.3
0xb5972361 in QListView::eventFilter(QObject*, QEvent*) + 0x5d from /Library/qt-x11-free-3.3.5/lib/libqt-mt.so.3
0xb58a91b8 in QObject::activate_filters(QEvent*) + 0x68 from /Library/qt-x11-free-3.3.5/lib/libqt-mt.so.3
0xb58a9106 in QObject::event(QEvent*) + 0xa2 from /Library/qt-x11-free-3.3.5/lib/libqt-mt.so.3
0xb58d9576 in QWidget::event(QEvent*) + 0x22 from /Library/qt-x11-free-3.3.5/lib/libqt-mt.so.3
0xb585b235 in QApplication::internalNotify(QObject*, QEvent*) + 0xb5 from /Library/qt-x11-free-3.3.5/lib/libqt-mt.so.3
0xb585aa4d in QApplication::notify(QObject*, QEvent*) + 0x1a9 from /Library/qt-x11-free-3.3.5/lib/libqt-mt.so.3
0xb58005b7 in QETWidget::translateMouseEvent(_XEvent const*) + 0x997 from /Library/qt-x11-free-3.3.5/lib/libqt-mt.so.3
0xb57fe3d9 in QApplication::x11ProcessEvent(_XEvent*) + 0x45d from /Library/qt-x11-free-3.3.5/lib/libqt-mt.so.3
0xb5812e9e in QEventLoop::processEvents(unsigned) + 0x966 from /Library/qt-x11-free-3.3.5/lib/libqt-mt.so.3
0xb586ac13 in QEventLoop::enterLoop() + 0xe7 from /Library/qt-x11-free-3.3.5/lib/libqt-mt.so.3
0xb586aad0 in QEventLoop::exec() + 0x24 from /Library/qt-x11-free-3.3.5/lib/libqt-mt.so.3
0xb585b450 in QApplication::exec() + 0x20 from /Library/qt-x11-free-3.3.5/lib/libqt-mt.so.3
0x080513f6 in main + 0x8a from ./neobase
0xb5351768 in __libc_start_main + 0xf8 from /lib/tls/libc.so.6
0x080512e1 in TFile::TFile[in-charge](char const*, char const*, char const*, int) + 0x31 from ./neobase
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