Re: Drawing objects in a file

Could you send your script and data file showing what you are doing?

Rene

On 28/04/2011 10:48, Stephan Zimmer wrote:
> Hi Rene,
> thanks for this advice but it doesn't work - any other suggestions?
> Stephan
>
>
> On 04/28/2011 08:20 AM, Rene Brun wrote:
>> With your example you should at least get your TH2F object drawn.
>> To draw the graphs you must specify a draw option, eg "alp" (default for
>> the browser).
>>
>> Rene Brun
>>
>> On 28/04/2011 00:37, Stephan Zimmer wrote:
>>> Hi Rooters,
>>> suppose I have a file that contains a number of objects (which I cannot
>>> really influence):
>>> root [1] .ls
>>> TFile** temp.root
>>> TFile* temp.root
>>> OBJ: TH2F hist0 : 0 at: 0xaa08418
>>> KEY: TH2F hist0;1
>>> KEY: TGraphErrors Graph;44 Graph
>>> KEY: TGraphErrors Graph;43 Graph
>>> KEY: TGraphErrors Graph;42 Graph
>>> KEY: TGraphErrors Graph;41 Graph
>>> KEY: TGraphErrors Graph;40 Graph
>>> KEY: TGraphErrors Graph;39 Graph
>>> KEY: TGraphErrors Graph;38 Graph
>>> KEY: TGraphErrors Graph;37 Graph
>>> KEY: TGraphErrors Graph;36 Graph
>>> KEY: TGraphErrors Graph;35 Graph
>>> KEY: TGraphErrors Graph;34 Graph
>>> KEY: TGraphErrors Graph;33 Graph
>>> KEY: TGraphErrors Graph;32 Graph
>>> KEY: TGraphErrors Graph;31 Graph
>>> KEY: TGraphErrors Graph;30 Graph
>>> KEY: TGraphErrors Graph;29 Graph
>>> KEY: TGraphErrors Graph;28 Graph
>>> KEY: TGraphErrors Graph;27 Graph
>>> KEY: TGraphErrors Graph;26 Graph
>>> KEY: TGraphErrors Graph;25 Graph
>>> KEY: TGraphErrors Graph;24 Graph
>>> KEY: TGraphErrors Graph;23 Graph
>>> KEY: TGraphErrors Graph;22 Graph
>>> KEY: TGraphErrors Graph;21 Graph
>>> KEY: TGraphErrors Graph;20 Graph
>>> KEY: TGraphErrors Graph;19 Graph
>>> KEY: TGraphErrors Graph;18 Graph
>>> KEY: TGraphErrors Graph;17 Graph
>>> KEY: TGraphErrors Graph;16 Graph
>>> KEY: TGraphErrors Graph;15 Graph
>>> KEY: TGraphErrors Graph;14 Graph
>>> KEY: TGraphErrors Graph;13 Graph
>>> KEY: TGraphErrors Graph;12 Graph
>>> KEY: TGraphErrors Graph;11 Graph
>>> KEY: TGraphErrors Graph;10 Graph
>>> KEY: TGraphErrors Graph;9 Graph
>>> KEY: TGraphErrors Graph;8 Graph
>>> KEY: TGraphErrors Graph;7 Graph
>>> KEY: TGraphErrors Graph;6 Graph
>>> KEY: TGraphErrors Graph;5 Graph
>>> KEY: TGraphErrors Graph;4 Graph
>>> KEY: TGraphErrors Graph;3 Graph
>>> KEY: TGraphErrors Graph;2 Graph
>>> KEY: TGraphErrors Graph;1 Graph
>>> root [2]
>>>
>>> I'm wondering why the following method of accessing the elements in a
>>> file does not work:
>>>
>>> TFile *f = new TFile("temp.root","r");
>>> TIter nextkey(f->GetListOfKeys());
>>> TKey *key;
>>> while (key = (TKey*)nextkey()) {
>>> TObject *obj = (TObject*)key->ReadObj();
>>> obj->Draw();
>>> }
>>>
>>> it doesn't complain but it doesn't show anything either. On the other
>>> hand, if i open the same file with the TBrowser it draws without
>>> complaints. As for the reference, I'm using Root 5.27/06 Could someone
>>> be so kind and help me figuring out what's going on here?
>>>
>>> Cheers and thanks,
>>> Stephan
>
Received on Thu Apr 28 2011 - 10:51:58 CEST