Re: GetUserInfo() for TChain

The UserInfo is specific to each Tree in the TChain. To get a pointer to the UserInfo corresponding to teh Tree being processed, do

TH1F* h = (TH1F*)chain->GetTree()->GetUserInfo()->At(0);

Rene

On 02/03/2011 13:08, Hovhannes Khandanyan wrote:
> Dear ROOTers,
>
> I have a TChain of TTrees each of which has UserInfo object with a TH1F in it. Things are OK when I operate with individual tree. Anyhow, as soon as I ask for :
>
> TH1F* h = (TH1F*)chain->GetUserInfo()->At(0);
>
> I get a NULL pointer. Please let me know what I am doing wrong.
>
> Thanks,
> Hovhannes
>
Received on Wed Mar 02 2011 - 13:59:16 CET