- You were using the wrong TTree::Branch function.
I have fixed the code below.
Rene Brun
lijowski@cosray2.wustl.edu wrote:
>
> 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", &EventNo, "EventNo/I",bufsize);
>
> for (EventNo = 0; EventNo < 10; EventNo++) {
> TT -> Fill();
> }
> tfile -> Write();
> }