Name for saving a canvas

ROOT
1

I have this piece of code to write a canvas to a pdf-file, where spigot_to_plot is a short int(let’s say 8 ):

		TCanvas * c  = new TCanvas("c", s.Data(),  1500, 800);
		c->Divide(5,3);
		for(unsigned int jj = 0; jj<14; jj++){
	  		c->cd(jj+1);
	  		c->Update();
	  		TPad * pad = (TPad*)gROOT->GetSelectedPad();
	  		f->getSecModGraphs(true,spigot_to_plot,jj+1,pad);

		}	
                    char testcanvas[20];
  		
 		sprintf(testcanvas,"testcanvas(%d).pdf",spigot_to_plot);             
	  		cout<<"Name  is "<<testcanvas <<endl;
  			c->SaveAs(testcanvas);

I want to give this file the name “testcanvas(8).pdf”. This is also what I get in the terminal from de cout. But the file which is created is just named “testcanvas”. What’s the problem here?
Thanks

2

The SaveAs method has some special control characters for multi-page PDFs and things like that. Have you tried escaping the parentheses with ( and )?

See here: http://root.cern.ch/root/html/TPad.html#TPad:Print@1

3

[quote=“jfcaron”]The SaveAs method has some special control characters for multi-page PDFs and things like that. Have you tried escaping the parentheses with ( and )?

See here: http://root.cern.ch/root/html/TPad.html#TPad:Print@1[/quote]

do you mean sprintf(testcanvas,"testcanvas\(%d\).pdf")? When I try this I get an error when I try to build:"error: unknown escape sequence ‘)’ " en when I use “testcanvas(%d).pdf” it builds but I get the same result as before.

4

I’m just guessing here, so a real ROOT expert can confirm/deny, but it’s possible that you just can’t use (N) in the filenames with SaveAs, because ROOT uses that as syntax for multi-page files. You could try saving the file using a dummy name, then using gSystem->Rename to rename it.

Jean-François

5

There was a bug in the pad saving which has(?) been fixed in the latest versions, see thread [url=https://root-forum.cern.ch/t/escaping-characters-when-saving-plots/16447/1 Characters when Saving Plots’[/url], especially post [url=https://root-forum.cern.ch/t/escaping-characters-when-saving-plots/16447/1