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Reference Guide
copyFiles.C File Reference

Detailed Description

View in nbviewer Open in SWAN Example of script showing how to copy all objects (including directories) from a source file.

For each input file, a new directory is created in the current directory with the name of the source file. After the execution of:

root [0] .x copyFiles.C

the file result.root will contain 4 subdirectories: "tot100.root", "hsimple.root", "hs1.root","hs2.root"

#include "TROOT.h"
#include "TKey.h"
#include "TFile.h"
#include "TSystem.h"
#include "TTree.h"
void CopyDir(TDirectory *source) {
//copy all objects and subdirs of directory source as a subdir of the current directory
source->ls();
TDirectory *adir = savdir->mkdir(source->GetName());
adir->cd();
//loop on all entries of this directory
TKey *key;
//Loop in reverse order to make sure that the order of cycles is
//preserved.
TIter nextkey(source->GetListOfKeys(),kIterBackward);
while ((key = (TKey*)nextkey())) {
const char *classname = key->GetClassName();
TClass *cl = gROOT->GetClass(classname);
if (!cl) continue;
source->cd(key->GetName());
adir->cd();
CopyDir(subdir);
adir->cd();
} else if (cl->InheritsFrom(TTree::Class())) {
TTree *T = (TTree*)source->Get(key->GetName());
// Avoid writing the data of a TTree more than once.
// Note this assume that older cycles are (as expected) older
// snapshots of the TTree meta data.
if (!adir->FindObject(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();
}
void CopyFile(const char *fname) {
//Copy all objects and subdirs of file fname as a subdir of the current directory
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();
}
void copyFiles() {
//prepare files to be copied
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
TFile *f = new TFile("result.root","recreate");
CopyFile("tot100.root");
CopyFile("hsimple.root");
CopyFile("hs1.root");
CopyFile("hs2.root");
f->ls();
delete f;
}
Author
Rene Brun

Definition in file copyFiles.C.