Multiple Page PDF Corrupted?

ROOT
1

Hi, I have some code which tries to make a multi-page PDF, but when I try to open the PDF in Preview on my Mac, it says

[quote]The file “TracePlots.pdf” could not be opened.
It may be damaged or use a file format that Preview doesn’t recognize.[/quote]

The code which generates the pdf looks like this:

[code] // Already have trees called C1,C2,C3,C3 with TVector branches called ampl_tv.
TCanvas *cTracePlots[N_TRACEPLOTS];
TGraph *gChan1;
TGraph *gChan2;
TGraph *gChan3;
TGraph *gChan4;

// Now we loop over all the entries
Int_t n_entries = C1->GetEntries();
for(Int_t i=0; i < n_entries; i++ )
{
// Make trace plots.
if( i < N_TRACEPLOTS )
{
cTracePlots[i] = new TCanvas();
cTracePlots[i]->Divide(2,2);
if( i == 0 ) cTracePlots[i]->Print(dir_to_plot+"/TracePlots.pdf[",“pdf”);

  cTracePlots[i]->cd(1);
  C1->Draw("ampl_tv->fElements:Iteration$ >> gChan1",TString::Format("Entry$==%i",i));
  gChan1 = (TGraph*)gDirectory->Get("gChan1");
  gChan1->SetTitle(TString::Format("Channel 1 Entry %i",i));

  cTracePlots[i]->cd(2);
  C2->Draw("ampl_tv->fElements:Iteration$ >> gChan2",TString::Format("Entry$==%i",i));
  gChan2 = (TGraph*)gDirectory->Get("gChan2");
  gChan2->SetTitle(TString::Format("Channel 2 Entry %i",i));
  
  cTracePlots[i]->cd(3);
  C3->Draw("ampl_tv->fElements:Iteration$ >> gChan3",TString::Format("Entry$==%i",i));
  gChan3 = (TGraph*)gDirectory->Get("gChan3");
  gChan3->SetTitle(TString::Format("Channel 3 Entry %i",i));

  cTracePlots[i]->cd(4);
  C4->Draw("ampl_tv->fElements:Iteration$ >> gChan4",TString::Format("Entry$==%i",i));
  gChan4 = (TGraph*)gDirectory->Get("gChan4");
  gChan4->SetTitle(TString::Format("Channel 4 Entry %i",i));

  gPad->Modified();
  gPad->Update();

  cTracePlots[i]->Print(dir_to_plot+"/TracePlots.pdf","pdf");

  if( i == N_TRACEPLOTS ) cTracePlots[i]->Print(dir_to_plot+"/TracePlots.pdf]","pdf");
}[/code]

When I used the same code to produce multiple single-page PDF files, it worked fine (though I was using SaveAs then, rather than Print).

Any ideas or solutions would be appreciated.

2

The following little example is working for me with the latest root version on MAc.

{

TFile f("hsimple.root","READ");
c1 = new TCanvas("c1","sub data",200,10,700,500);

hpx->Draw();
c1->Print("h1.pdf[");
c1->Print("h1.pdf");
c1->Print("h1.pdf");
c1->Print("h1.pdf");
c1->Print("h1.pdf]");

}

You can also use "( ) " instead of " [ ] "