Subdirectories

[cmosquer]

Hello
I am trying to create a subdirectory ( a directory inside another directory) and write data to it. I am not sure what i am doing wrong:

Code: Select all

  TFile *file = fChain->GetCurrentFile();

  file->cd();
  file->mkdir("Thermal/");
  file->cd("Thermal/");
  AnalysisResultTuple.Write("",TObject::kOverwrite);

  file->cd();
  file->mkdir("Thermal/Zdepth");
  file->cd("/Thermal/Zdepth/");
  thermal_depthSlicesHist->Write("",TObject::kOverwrite);
  thermal_depthSliceEkinHist->Write("",TObject::kOverwrite);
  thermal_depthSliceEdepHist->Write("",TObject::kOverwrite);



Using a TBrowser, files are not written in the proper subdirectory. They are written at the file.root:/ level directory. What am I doing wrong??

Thxs,

[Wile E. Coyote]

Right before doing "Something->Write(...);", try to call "Something->SetDirectory(gDirectory);"

[cmosquer]

Great Thanks. However, TObjArrays do not have that method? Is there any other way to set the directory before writing objects?

[Wile E. Coyote]

I'm afraid you need to loop over all objects from your TObjArray and for each of them call "SetDirectory(gDirectory)".

Maybe a better solution would be to make sure that all histograms are "associated" with "gROOT" or with "nothing" at their creation time. Before you call "new Something(...)", make sure that you "gROOT->cd();", or after you call "new Something(...)" make sure that you call "SetDirectory(gROOT)" or "SetDirectory(0)" for this newly created object.
You could also execute the static method TDirectory::AddDirectory(kFALSE); in advance, before you create any histograms (then there's no need to call "SetDirectory(0)" for them).