[ROOT] gPad->Print() in a loop produces empty ps files

From: Mike Kordosky (kordosky@mail.hep.utexas.edu)
Date: Thu Nov 28 2002 - 06:47:24 MET 

Hi,

I have some histograms in a file and I loop through them to print:

// f is a TFile object

TIter it(f.GetList());
while(TH1* h=dynamic_cast<TH1*>(hiter.Next())){
	string plot_name=h->GetName(); plot_name+=".eps";
	gPad->Print(plot_name.c_str());
}

This is in an executable program linked with the root libraries.  Now, the
problem is that the program outputs things like:

Info in <TCanvas::Print>: PostScript file myhist.eps has been created and
corresponding files are produced.  When I use gv to look at them nothing
is there. The same is true if I use the extension ".ps". Also, when trying
this with the extension ".gif" rather than ".eps" I get an error:

Cannot create gif file in batch mode.

Can someone explain why what I am doing doesn't work?

I use gcc3.2 on a redhat 7.2 pc.  My root version is from cvs on nov6
2002.

Thanks,

Mike Kordosky

 --
Graduate Research Assistant  // High Energy Physics Lab
kordosky@hep.utexas.edu     // University of Texas at Austin
kordosky@fnal.gov	   //
ph: (512) 471-8426 (RLM Lab, Office)
    (512) 475-8673 (ENS Lab)

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