Simple Tree macro

From: lijowski@cosray2.wustl.edu
Date: Thu Feb 11 1999 - 00:07:04 MET


  Hello,

  Below is a simple macro I have a problem with on SunOS 5.5 Root v2.20/06
  compiled under SunOS 5.4.

  First, it returns an error 
Error: Can't call TTree::SetAutoSave() in current scope FILE:/export/home/lijowski/ace/cris/flight/root/fits/./test_Tree.C LINE:17
*** Interpreter error recovered ***

But when I comment this line, the macro crashes in line 26 with a message
error in <TFile::TFile>; file does not exist.

 Am I missing anything?  Thank you for any hints.

 Regards

 Michal Lijowski


void test_Tree()
{
   gROOT -> Reset();

 // Create a new ROOT file to contain tree

   Int_t comp = 1;  // compress file
   Int_t bufsize = 32000;
          
   TFile *tfile = new TFile("test_Tree.root", "recreate");
// file is compressed
   tfile -> SetCompressionLevel(comp);

// Create a new Tree with branches

   TTree *TT = new TTree("TT", "test tree");
   TT -> SetAutoSave("1000000000"); // autosave when 1 GB is written

// create branches

   Int_t EventNo = 0;
   TBranch *br0  = TT -> Branch("EventNo", "Event Number", &EventNo, bufsize, comp);

   for (EventNo = 0; EventNo < 10; EventNo++)  {
      TT -> Fill(); 
   }
   tfile -> Write();
}



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