root [0] .x copyFiles.C
the file result.root will contain 4 subdirectories: "tot100.root", "hsimple.root", "hs1.root","hs2.root"
Author: Rene Brun
This notebook tutorial was automatically generated with ROOTBOOK-izer (Beta) from the macro found in the ROOT repository on Thursday, January 19, 2017 at 04:28 PM.
In [1]:
%%cpp -d
#include "TROOT.h"
#include "TKey.h"
#include "TFile.h"
#include "TSystem.h"
#include "TTree.h"
A helper function is created:
In [2]:
%%cpp -d
void CopyDir(TDirectory *source) {
//copy all objects and subdirs of directory source as a subdir of the current directory
source->ls();
TDirectory *savdir = gDirectory;
TDirectory *adir = savdir->mkdir(source->GetName());
adir->cd();
//loop on all entries of this directory
TKey *key;
TIter nextkey(source->GetListOfKeys());
while ((key = (TKey*)nextkey())) {
const char *classname = key->GetClassName();
TClass *cl = gROOT->GetClass(classname);
if (!cl) continue;
if (cl->InheritsFrom(TDirectory::Class())) {
source->cd(key->GetName());
TDirectory *subdir = gDirectory;
adir->cd();
CopyDir(subdir);
adir->cd();
} else if (cl->InheritsFrom(TTree::Class())) {
TTree *T = (TTree*)source->Get(key->GetName());
adir->cd();
TTree *newT = T->CloneTree(-1,"fast");
newT->Write();
} else {
source->cd();
TObject *obj = key->ReadObj();
adir->cd();
obj->Write();
delete obj;
}
}
adir->SaveSelf(kTRUE);
savdir->cd();
}
A helper function is created:
In [3]:
%%cpp -d
void CopyFile(const char *fname) {
//Copy all objects and subdirs of file fname as a subdir of the current directory
TDirectory *target = gDirectory;
TFile *f = TFile::Open(fname);
if (!f || f->IsZombie()) {
printf("Cannot copy file: %s\n",fname);
target->cd();
return;
}
target->cd();
CopyDir(f);
delete f;
target->cd();
}
Prepare files to be copied
In [4]:
if(gSystem->AccessPathName("tot100.root")) {
gSystem->CopyFile("hsimple.root", "tot100.root");
gSystem->CopyFile("hsimple.root", "hs1.root");
gSystem->CopyFile("hsimple.root", "hs2.root");
}
Main function copying 4 files as subdirectories of a new file
In [5]:
TFile *f = new TFile("result.root","recreate");
CopyFile("tot100.root");
CopyFile("hsimple.root");
CopyFile("hs1.root");
CopyFile("hs2.root");
f->ls();
delete f;