Re: Second time around and the object "T" isn't found...
Rene Brun (Rene.Brun@cern.ch)
Mon, 20 Oct 1997 08:40:29 +0200
Gordon Watts (Brown University) wrote:
>
> Hi,
> I've got a macro file I can only execute once in ROOT... that is, I need
> to exit and enter root to get it to run correctly the second time.
> Basically, I open a file and get a handle on a branch of a tree. The second
> time through it bombs on the T.GetBranch (no such symbol)...
>
> {
> TFile f("output.root");
> TTree *R = (TTree *) f.Get("T");
> TBranch *b = T.GetBranch("event");
> }
>
> Cheers,
> Gordon.
>
Two points.
1- You should change (typo?) the statement
TTree *R = ... to
TTree *T = ...
2- If you intend to invoke this macro several times in one session, you
better do:
TFile *f = new TFile(..
TTree *T = (TTRee*) f->Get("T");
and may be insert the statement
gROOT->Reset() as first statement.
Rene Brun