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/*************************************************
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Counts the number of entries in a histogram in
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a root file.
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Can be used in three ways, depending on what is
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given:
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1) A root file name:
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List the entries in all the histograms in the file
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2) A root file name & a histogram name:
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Just list the entries in one histgram from one file
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3) A histogram name:
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Run over all root files in a directory and
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find the number of entries in a given histogram.
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Michael B. Anderson
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April 15, 2008
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*************************************************/
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#include <TFile.h>
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#include <TObjString.h>
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#include <iomanip.h>
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// Figure out if we were given
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// a root file name or a histogram name
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// and call the correct function.
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void entryCount(TString argument) {
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if ( argument.Contains(".root") ) {
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countEntriesInFile(argument);
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} else {
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entryCountInAllFiles(argument);
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}
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}
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// List the entries in all the histograms in the file
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void countEntriesInFile(TString fileName) {
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// Open the File
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TFile f(fileName);
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TH1 *h;
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TTree *t;
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TKey *key;
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TIter nextkey(gDirectory->GetListOfKeys());
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cout << setw(29) << " Object " << " entries" << endl;
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cout << setw(29) << "---------" << " -------" << endl;
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while (key = (TKey*)nextkey()) {
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obj = key->ReadObj();
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if (obj->IsA()->InheritsFrom("TH1")) {
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h = (TH1*)obj;
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TString histName = h->GetName();
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Long64_t countOfEntries = h->GetEntries();
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cout << "TH1 : " << setw(20) << histName << " " << countOfEntries << endl;
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} else if (obj->IsA()->InheritsFrom("TNtuple")) {
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t = (TTree*)obj;
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TString histName = t->GetName();
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Long64_t countOfEntries = t->GetEntries();
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cout << "TNtuple: " << setw(20) << histName << " " << countOfEntries << endl;
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}
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} // End of loop over all keys in file
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f.Close();
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}
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// Just list the entries in one histgram from one file
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void entryCount(TString fileName, TString histName) {
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// Open the File
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TFile f(fileName);
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TObject *obj = f.Get(histName);
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if ( !obj ) {
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cout << fileName << " does not contain " << histName << endl;
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return;
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}
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if (obj->IsA()->InheritsFrom("TH1")) {
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h = (TH1*)obj;
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TString histName = h->GetName();
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Long64_t countOfEntries = h->GetEntries();
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cout << "TH1 : " << setw(20) << histName << " " << countOfEntries << endl;
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} else if (obj->IsA()->InheritsFrom("TNtuple")) {
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t = (TTree*)obj;
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TString histName = t->GetName();
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Long64_t countOfEntries = t->GetEntries();
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cout << "TNtuple: " << setw(20) << histName << " " << countOfEntries << endl;
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}
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}
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// Run over all root files in a directory and
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// find the number of entries in a given histogram.
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void entryCountInAllFiles(TString histName) {
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TString dirname = "."; // . = this directory
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TString pattern = ".root"; // match only root files
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cout << "Files in " << dirname << " that match '" << pattern << "'" << endl;
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cout << "Entries in histograms that match '" << histName << "'" << endl;
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void *dir = gSystem->OpenDirectory(dirname);
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if (!dir) {
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cerr << "couldn't open directory" << dirname << endl;
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return 0;
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}
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TObjArray* fileList = new TObjArray;
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const char* file;
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TString fileName;
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TRegexp regexp(pattern);
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Int_t maxFileNameLength = 10;
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while ( (file = gSystem->GetDirEntry(dir)) ) {
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fileName = file;
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if (!fileName.CompareTo(".") || !fileName.CompareTo("..")) continue;
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// Check if the filename matches the regexp
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if (fileName.Index(regexp) != kNPOS) {
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// if it does, add to list
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fileList->Add(new TObjString(fileName));
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if ( fileName.Length() > maxFileNameLength ) {
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maxFileNameLength = fileName.Length();
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}
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}
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}
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gSystem->FreeDirectory(dir);
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TIter next(fileList);
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TObjString* fn;
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cout << setw(maxFileNameLength+1) << "Filename" << " entries" << endl;
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cout << setw(maxFileNameLength+1) << "--------" << " -------" << endl;
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while ( fn = (TObjString*)next() ) {
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TString s = fn->GetString();
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TFile* f = TFile::Open( s );
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if ( !f ) continue;
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TObject *obj = f->Get(histName);
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if ( !obj ) {
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cout << setw(maxFileNameLength+1) << s << " does not contain " << histName << endl;
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continue;
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}
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// ********************************************
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// ** Change what you want in here to do
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// whatever to the files.
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if (obj->IsA()->InheritsFrom("TH1")) {
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h = (TH1*)obj;
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TString histName = h->GetName();
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Long64_t countOfEntries = h->GetEntries();
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cout << setw(maxFileNameLength+1) << s << " " << countOfEntries << endl;
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} else if (obj->IsA()->InheritsFrom("TNtuple")) {
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t = (TTree*)obj;
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TString histName = t->GetName();
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Long64_t countOfEntries = t->GetEntries();
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cout << setw(maxFileNameLength+1) << s << " " << countOfEntries << endl;
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}
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// ********************************************
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f->Close();
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}
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}
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