Hi Ulrich, Could you send me your header file for the classes MeasurementData, & object pointed by "annotation" (I suppose it is a TPaveText) and the corresponding implementation files. Rene Brun Ulrich Jost wrote: > > Hello, > > in a program I write some root objects to a file with TObject::Write() and > try to read them back with TObject::Read(), but get segmentation faults on > the Read statement. Any ideas welcome. > Ulrich > > TFile rfile("test.root" , "new"); > rfile.SetCompressionLevel(1); > md->annotation->Write("annotation"); > ... > > TFile rfile("test.root", "read"); > if (rfile.IsOpen()){ > md = new MeasurementData(); // contains default constructors for root obj > md->annotation->Read("annotation"); // segfault, trace back: > > #0 0x4037f5c7 in G__ClassInfo::IsValid () > #1 0x403801c5 in G__ClassInfo::New () > #2 0x407523ad in TClass::New () > #3 0x402c5a8d in TBuffer::ReadObject () > #4 0x4031e6c0 in operator>> () > #5 0x404eea2a in TCollection::Streamer () > #6 0x4050dd99 in TSeqCollection::Streamer () > #7 0x4050d749 in TList::Streamer () > #8 0x402c5ae9 in TBuffer::ReadObject () > #9 0x4050d71c in operator>> () > #10 0x405ab74d in TPaveText::Streamer () > #11 0x403229e4 in TKey::Read () > #12 0x40328095 in TObject::Read () > #13 0x806a7bf in MainWindow::treatList (this=0xbffff7e4, id=2) at > src/probe_mainwindow.cpp:533
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