[ROOT] macro works line-by-line, not when executed

From: Kevin M. Rhodes (kmr@alizarin.physics.wisc.edu)
Date: Mon Jul 03 2000 - 17:24:45 MEST 

Hello rooters,

I'm having trouble with a macro.  It works just fine when I type it in
line-by-line, but when I execute the macro, it doesn't work.  It's
designed to open four files, create a new canvas, divide it into 4 pads,
and draw and fit histograms on each of the pads.  But it seems that the
macro executes too quickly for the pads to be drawn, because although it
works line-by-line, when executed, I get four empty pads. 

I'm including a much shorter version of the macro that also works
line-by-line, but fails when executed.

Any ideas??

Kevin Rhodes
UW Madison
Amanda Project


void macro_PMT_bare(){
   TFile f1("/home/filename.root");
   Int_t idvar = 100001
   char *hidvar, *cidvar;
   hidvar = (char *)calloc(50, sizeof(char));
   cidvar = (char *)calloc(50, sizeof(char));
   sprintf(hidvar, "%s%d", "h", idvar);
   sprintf(cidvar, "%s%d", "c", idvar);
   TCanvas *canvas = new TCanvas(cidvar, hidvar);
   canvas->Divide(2,2);
   canvas->cd(1);
   TH1F *h1 = (TH1F*)f1->Get(hidvar);
   h1->Draw();
}

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