plot_all.C

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#include "TString.h"
#include "TFile.h"
#include "TCanvas.h"
#include "TKey.h"
#include <iostream>
#include "TH1F.h"
#include "TRandom.h"

using std::cout;
using std::endl;

bool plot_all(TString fn="QA_histograms.root")
{
  TCanvas *c1 = new TCanvas();
  c1->Divide(6,6);
  
  TFile *f=new TFile(fn,"READ");
  if (!f->IsZombie())
    {
      TKey *key;
      TIter next(f->GetListOfKeys());
      
      Int_t yy = 0;
      while ( (key = (TKey*)next()) )
        {
          c1->cd(yy+1);
          TObject *obj = key->ReadObj();
          
          // only check TH1Fs
          if (!obj->InheritsFrom("TH1F")) continue;
          
          TString name = obj->GetName();
          cout << name << endl;
          TH1F* h  = (TH1F*) obj; 
          h->SetLineColor(2);
          h->SetLineWidth(2);
          h->Draw();
          yy++;
        }
      
    }
}