Dirk Meier wrote: > > hello, > > In an executable program linked to root I'm filling > a "TTree* fEventTree" with events and want to > write the fEventTree to a "TFile* fEventFile". > As soon as I close the file it seems that fEventTree is automatically > deleted. The fEventFile is created and correctly closed, but it does not > contain fEventTree data. Then Loading the file is possible, but looking > at the data gives a segmentaion fault. > When you close a Root file, all objects in memory associated with this file are deleted. In your case, you should not close the file or, if you close the file, you must reopen it and get the Tree header in memory again. Before closing a file containing a Tree, you must write the Tree header on this file. file->cd(); // in case your current directory is not file tree->Write(); //this will write the Tree header Look also at the discussion at URL: http://root.cern.ch/root/roottalk/roottalk98/0145.html Rene Brun
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