Hi Michael, If you want to write all objects (histograms) in the default directory "Rint" in memory to the file f, do: //assuming you are already in "Rint:/" where you have histograms TDirectory *dir = gDirectory; //save pointer to Rint dir TFile *f = new TFile("Hmu.root","recreate"); dir->GetList()->Write(); f->ls(); delete f; Rene Brun On Thu, 6 Jun 2002, Michael Gold wrote: > Dear Rooters: > > when I execute this, the histograms are there in > the local memory, but the f->ls() shows the file > is empty. > > what is wrong here? > > thanks, Michael > > void save() > { > TFile *f = new TFile("Hmu.root","recreate"); > //gDirectory->pwd(); > gDirectory->cd("Rint:/"); > gDirectory->ls("-m"); > // gDirectory->GetList()->ls(); > f->Write(); > f->ls(); > // automatic upon deletion f->Close(); > delete f; > } >
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