I have added a new tutorial loopdir.C showing how to:
-loop on all objects in one file
-print on postscript all objects deriving from TH1
The script is now in CVS and also shown below
void loopdir() {
// example of script to loop on all the objects of a directory
// and print on Postscript all TH1 derived objects
// This script uses the file generated by tutorial hsimple.C
TFile f("hsimple.root");
TIter next(f.GetListOfKeys());
TKey *key;
TCanvas c1;
c1.Print("hsimple.ps[");
while ((key = (TKey*)next())) {
TClass *cl = gROOT->GetClass(key->GetClassName());
if (!cl->InheritsFrom("TH1")) continue;
TH1 *h = (TH1*)key->ReadObj();
h->Draw();
c1.Print("hsimple.ps");
}
c1.Print("hsimple.ps]");
}