Hi,
In my code, tbuf is appended to myfile, but not ctbuf, since I call
ctdir->cd() I before create it. The TFile associated with ctbuf is
supposed to be the one that contains ctdir.
Thank you
Pierre-Luc Drouin
On Wed, 2 Jul 2003, Philippe Canal wrote:
> Hi Pierre-Luc,
>
> When you close a file, all the objects 'Appended' to this file are deleted.
> In particular, histogram and trees are automatically appended to the current
> directory. Hence, 'myfile->Close();' as the side-effect of deleting ctbuf.
>
> You might want to (re)read the chapter on object ownership in the ROOT Users
> Guide.
>
> Note that your code is missing (at least in this copy/pasted version) and
> essential
> myfile->Write();
> without which the tree is not fully written/flushed to the file.
>
> Cheers,
> Philippe
>
> -----Original Message-----
> From: owner-roottalk@pcroot.cern.ch
> [mailto:owner-roottalk@pcroot.cern.ch]On Behalf Of Pierre-Luc Drouin
> Sent: Wednesday, July 02, 2003 11:03 AM
> To: roottalk@pcroot.cern.ch
> Subject: [ROOT] Segmentation fault. Cause: Closing a TFile
>
>
> Hello,
>
> I've to open a TFile, get a TTree instance from it, and copy this TTree
> with some selections to a new TTree object and then to close the TFile. My
> code is the following:
>
> TTree *tbuf, *ctbuf;
> TDirectory* fluxdir= \\A pointer to a TDirectory in a TFile
> TDirectory *ctdir;
>
> TFile *myfile=new TFile("myfile.root","READ");
>
>
> tbuf=dynamic_cast<TTree*>(myfile->Get("mytree"));
>
> ctdir=fluxdir->mkdir("Event Info");
> ctdir->cd();
>
> ctbuf=tbuf->CopyTree(allcuts);
>
> myfile->Close();
> gROOT->Delete(cardbuf[i][filenameindex]);
>
>
> I get a segmentation fault when I try to ctbuf->Draw() further in the
> code. Since gDirectory==ctdir in the code, I don't understand how ctbuf
> could depend on myfile. When I comment the last two lines in the code,
> everything works fine
>
> Thank you
>
> Pierre-Luc Drouin
>
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