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copyFiles.C File Reference

Detailed Description

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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;
}
#define f(i)
Definition RSha256.hxx:104
constexpr Bool_t kTRUE
Definition RtypesCore.h:100
const Bool_t kIterBackward
Definition TCollection.h:43
#define gDirectory
Definition TDirectory.h:384
Option_t Option_t TPoint TPoint const char GetTextMagnitude GetFillStyle GetLineColor GetLineWidth GetMarkerStyle GetTextAlign GetTextColor GetTextSize void char Point_t Rectangle_t WindowAttributes_t Float_t Float_t Float_t Int_t Int_t UInt_t UInt_t Rectangle_t Int_t Int_t Window_t TString Int_t GCValues_t GetPrimarySelectionOwner GetDisplay GetScreen GetColormap GetNativeEvent const char const char dpyName wid window const char font_name cursor keysym reg const char only_if_exist regb h Point_t winding char text const char depth char const char Int_t count const char ColorStruct_t color const char Pixmap_t Pixmap_t PictureAttributes_t attr const char char ret_data h unsigned char height h Atom_t Int_t ULong_t ULong_t unsigned char prop_list Atom_t Atom_t target
#define gROOT
Definition TROOT.h:406
R__EXTERN TSystem * gSystem
Definition TSystem.h:555
TClass instances represent classes, structs and namespaces in the ROOT type system.
Definition TClass.h:81
Bool_t InheritsFrom(const char *cl) const override
Return kTRUE if this class inherits from a class with name "classname".
Definition TClass.cxx:4874
static TClass * GetClass(const char *name, Bool_t load=kTRUE, Bool_t silent=kFALSE)
Static method returning pointer to TClass of the specified class name.
Definition TClass.cxx:2968
Describe directory structure in memory.
Definition TDirectory.h:45
static TClass * Class()
virtual TObject * Get(const char *namecycle)
Return pointer to object identified by namecycle.
void ls(Option_t *option="") const override
List Directory contents.
TObject * FindObject(const char *name) const override
Find object by name in the list of memory objects.
virtual Bool_t cd()
Change current directory to "this" directory.
virtual void SaveSelf(Bool_t=kFALSE)
Definition TDirectory.h:255
virtual TDirectory * mkdir(const char *name, const char *title="", Bool_t returnExistingDirectory=kFALSE)
Create a sub-directory "a" or a hierarchy of sub-directories "a/b/c/...".
virtual TList * GetListOfKeys() const
Definition TDirectory.h:223
A ROOT file is composed of a header, followed by consecutive data records (TKey instances) with a wel...
Definition TFile.h:53
static TFile * Open(const char *name, Option_t *option="", const char *ftitle="", Int_t compress=ROOT::RCompressionSetting::EDefaults::kUseCompiledDefault, Int_t netopt=0)
Create / open a file.
Definition TFile.cxx:4067
Book space in a file, create I/O buffers, to fill them, (un)compress them.
Definition TKey.h:28
virtual const char * GetClassName() const
Definition TKey.h:75
virtual TObject * ReadObj()
To read a TObject* from the file.
Definition TKey.cxx:758
const char * GetName() const override
Returns name of object.
Definition TNamed.h:47
Mother of all ROOT objects.
Definition TObject.h:41
virtual Int_t Write(const char *name=nullptr, Int_t option=0, Int_t bufsize=0)
Write this object to the current directory.
Definition TObject.cxx:880
virtual int CopyFile(const char *from, const char *to, Bool_t overwrite=kFALSE)
Copy a file.
Definition TSystem.cxx:1341
virtual Bool_t AccessPathName(const char *path, EAccessMode mode=kFileExists)
Returns FALSE if one can access a file using the specified access mode.
Definition TSystem.cxx:1296
A TTree represents a columnar dataset.
Definition TTree.h:79
Int_t Write(const char *name=nullptr, Int_t option=0, Int_t bufsize=0) override
Write this object to the current directory.
Definition TTree.cxx:9743
static TClass * Class()
Author
Rene Brun

Definition in file copyFiles.C.