Hi Ruben,
Could you specify which version of ROOT?
In case you use an old version, could you try with 3.10/02 or better 4.00/03?
Could you send a small tar file with teh strict minimum to reproduce this
problem?
Rene Brun
Ruben Shahoyan wrote:
>
> Hello,
> we have a following problem with I/O of the objects having streamer
> versions:
> the base object for na60 digits is
>
> class NaDigit1D :
> public TObject {
> ...
> protected:
> Int_t fI; // Value of the digit
> Int_t fCluster; // Number of the Cluster to which it is attached
> TArrayI* fTracks; // Optional array of references on track
> //
> #ifdef STOREFULLINFO
> Float_t fXYZE[4];
> ClassDef(NaDigit1D,2) // Base class for 1Dim digits with FULL TRACKING INFO
> #else
> ClassDef(NaDigit1D,1) // Base class for 1Dim digits
> #endif
> };
>
> the #define STOREFULLINFO in the NaDigit1D.h allows us to switch from
> version 1 to more complete version 2.
>
> The default constructor is:
> NaDigit1D::NaDigit1D()
> {
> fI = -1;
> fCluster = -1;
> fTracks = 0;
> #ifdef STOREFULLINFO
> fXYZE[0]=fXYZE[1]=fXYZE[2]=fXYZE[3]=0.0;
> #endif
> //
> }
>
> The I/O works fine when I read/rewrite the digits of some version with the
> code compiled with the corresponding version of the class.
>
> But we have large amount of data written with the version 1 (i.e. w/o
> fXYZE member) which we need to read and store after some processing as a
> digits of version 2 (with fXYZE member). The code compiled with
> #define STOREFULLINFO reads w/o problem the old digits of version 1,
> but when I sotre them again, and try to read them back as a digits of
> version 2, they appear to be completely corrupted.
>
> Here is what I get with gDebug = 1 for reading of the class NaPixDigit,
> which derives from NaDigit1D by adding a new member fCol.
>
> (1) Reading the NaDigit1D of version 1 with the class compiled for version 2
> ...
> ====>Rebuilding TStreamerInfo for class: NaPixDigit, version: 1
> ====>Rebuilding TStreamerInfo for class: NaDigit1D, version: 1
> StreamerInfo for class: NaDigit1D, version=1
> TObject BASE offset= 0 type=66 Basic ROOT object
> Int_t fI offset= 12 type= 3 Value of the digit
> Int_t fCluster offset= 16 type= 3 Number of the Cluster to which it is attached
> TArrayI* fTracks offset= 20 type=69 Optional array of references on track
> i= 0, TObject type= 66, offset= 0, len=1, method=0
> i= 1, fI type= 3, offset= 12, len=1, method=0
> i= 2, fCluster type= 3, offset= 16, len=1, method=0
> i= 3, fTracks type= 69, offset= 20, len=1, method=1074526452
>
> StreamerInfo for class: NaPixDigit, version=1
> NaDigit1D BASE offset= 0 type= 0 Base class for 1Dim digits
> Int_t fCol offset= 40 type= 3 Column of the pixel (NaDigit1D::fI is row)
> i= 0, NaDigit1D type= 0, offset= 0, len=1, method=161037840
> i= 1, fCol type= 3, offset= 40, len=1, method=0
>
> ....
> root [10] gVerTel->GetSensor(0)->GetDigit(2)->Dump()
> ==>Dumping object at:a273f80, name=NaPixDigit, class=NaPixDigit
> fCol 0 Column of the pixel (NaDigit1D::fI is row)
> fI 147 Value of the digit
> fCluster 2 Number of the Cluster to which it is attached
> *fTracks ->0 Optional array of references on track
> fXYZE[4] 0
> fUniqueID 131185 object unique identifier
> fBits 50331648 bit field status word
>
> Here everything is correct. Now I store these digits and try to
> (2) read them back with the same code of NaDigit1D version 2:
>
> ====>Rebuilding TStreamerInfo for class: NaPixDigit, version: 1
> Creating StreamerInfo for class: NaDigit1D, version: 2
>
> StreamerInfo for class: NaDigit1D, version=2
> TObject BASE offset= 0 type=66 Basic ROOT object
> Int_t fI offset= 12 type= 3 Value of the digit
> Int_t fCluster offset= 16 type= 3 Number of the Cluster to which it is attached
> TArrayI* fTracks offset= 20 type=69 Optional array of references on track
> Float_t fXYZE[4] offset= 24 type=25
> i= 0, TObject type= 66, offset= 0, len=1, method=0
> i= 1, fI type= 23, offset= 12, len=2, method=0
> i= 2, fTracks type= 69, offset= 20, len=1, method=1074526452
> i= 3, fXYZE type= 25, offset= 24, len=4, method=0
>
> StreamerInfo for class: NaPixDigit, version=1
> NaDigit1D BASE offset= 0 type= 0 Base class for 1Dim digits
> Int_t fCol offset= 40 type= 3 Column of the pixel (NaDigit1D::fI is row)
> i= 0, NaDigit1D type= 0, offset= 0, len=1, method=160981416
> i= 1, fCol type= 3, offset= 40, len=1, method=0
>
> ...
> root [9] gVerTel->GetSensor(0)->GetDigit(2)->Dump()
> ==>Dumping object at:a5c2f38, name=NaPixDigit, class=NaPixDigit
>
> fCol 0 Column of the pixel (NaDigit1D::fI is row)
> fI 178 Value of the digit
> fCluster 185 Number of the Cluster to which it is attached
> *fTracks ->0 Optional array of references on track
> fXYZE[4] 0
> fUniqueID 131185 object unique identifier
> fBits 50331648 bit field status word
>
> The same digit now has completely different values, and the StreamerInfo
> also looks different: in the output (1) it had a table entry for
> i= 2, fCluster type= 3, offset= 16, len=1, method=0
>
> while in the output (2) it has disappeared, which apparently leads to
> misalignment during the reading.
>
> Have I done something wrong or there is a problem in the schema evolution?
>
> Ruben Shahoyan
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