Re: Using numbers inside root collection.

From: Ronen Abravanel <ronen.abravanel_at_cern.ch>
Date: Mon, 10 Aug 2009 11:37:18 +0200

But how do thosI reade non-TObjects from a root file? My trivial guess,

    root [0] TFile f("junk.root")
    root [1] o = f.Get("a")
    (class TObject*)0x8451a20
    root [2] a = (TArrayI*)o
    (class TArrayI*)0x8451a20
    root [3] a->GetAt(1)
    Error in <TArrayI::At>: index 1 out of bounds (size: 0, this:     0x08451a20)

    (const Double_t)0.00000000000000000e+00

    root [4] a->GetAt(2)
    Error in <TArrayI::At>: index 2 out of bounds (size: 0, this:     0x08451a20)

    (const Double_t)0.00000000000000000e+00

    root [6] a->GetArray()[1]

• Break *** segmentation violation (no debugging symbols found) Attaching to program: /proc/15532/exe, process 15532 (no debugging symbols found)...done. [Thread debugging using libthread_db enabled] [New Thread 0xb6fff6d0 (LWP 15532)] (no debugging symbols found)...done. (no debugging symbols found)...done. (no debugging symbols found) 0xb802f430 in __kernel_vsyscall () error detected on stdin The program is running. Quit anyway (and detach it)? (y or n) [answered Y; input not from terminal] Detaching from program: /proc/15532/exe, process 15532

won't work...

Rene Brun wrote:
> You can write any non-TObject to a ROOT file, STL collection or ROOT
> class like TArray.
> For example, you can create a TArrayI object and write it to a file with:
> root [0] TFile f("junk.root","recreate")
> root [1] TArrayI a[5]
> root [2] a[0]=0
> root [3] a[1]=1
> root [4] a[2]=2
> root [5] a[3]=3
> root [6] a[4]=4
> root [7] f.WriteObjectAny(&a,"TArrayI","a")
>
> For more details, read chapter about I/O in the Users Guide.
>
> Rene Brun
>
>
> Ronen Abravanel wrote:
>> Hello,
>>
>>
>> I want to use collection that use numbers (for example, like STL's
>> map<Int_t,TString>...)
>>
>>
>> Is there any better way then to create a TObject-derived class that
>> wraps Int_t?
>>
>> (And the same thing about writing Integers into a root file.. Is
>> there other way to write numbers to a root file other then wrap them
>> by an object?)
>>
>>
>> Thanks,
>>
>> Ronen.
>>
>
>
Received on Mon Aug 10 2009 - 11:36:54 CEST