On Tue, 25 Feb 2003, Rene Brun wrote: > If you have created your Tree with one single top level branch (eg event), you > should set the address of this top level branch and not the address of one of > the sub-branches. I need to see your code to come with a better > diagnostic. The tree is definitely not created from a single top level object - it is created from multiple branches each containing a TClonesArray or a single object. I can copy the TClonesArray branches successfully - they work fine. It is only the single object branches that I have trouble with. The code used to create the branches is: if (_Fruits->InheritsFrom("TClonesArray")) { tree->Branch(_BranchName.Data(), &_Fruits, buffersize); } else { tree->Branch(_BranchName.Data(),_Fruits->ClassName(),&_Fruits,buffersize); } However I have no control over this code (it's part of the D0 thumbnail package). In the case in question _Fruits is a TObject * which points to an instance of TMBGlob. The code I have written to access the branch is: // Turn on the branch for readout tree()->SetBranchStatus(_bname.c_str(),1); // Set the branch address to the data object tree()->SetBranchAddress(_bname.c_str(),&_ptr); and this works fine for the original TTree. _ptr points to a valid instance of TMBGlob which gets filled with the data. I can also email a tarball of the entire readout code if you need to see it all. I have also tried turning on branches "Glob.*" but then I get the error that ROOT con't find them. One thing that is worth mentioning is that I only provide addresses for the branches which are turned on. I know this has implications for the I/O speed but not for the CopyTree method. > You are mentionning problems with rootcint with the more recent versions of > ROOT. Did you report these problems to somebody? I haven't reported these problems yet because I haven't had a chance to look at them in detail. I had assumed that there were significant changes to rootcint and that I would need to alter my code to make it work. However if code that compiles with ROOT 3.03/09 should compile with ROOT 3.04/02 without changes then I'd be happy to send you the error messages I get along with my code. If there are definite changes that I need to make then I'd be very happy if you could give me a pointer to them - I didn't see anything in the release notes that gave me cause for concern. Roger > Roger Moore wrote: > > > > I have been using the CopyTree method, along with a TEventList, to select > > a subset of events and branches in a TChain to write out to a TTree. This > > works absolutely fine for TClonesArray branches. However for the single > > object branch in the TChain it fails miserably. The entire branch somehow > > gets converted into a single 'TObject' branch. Shown below is the result > > of a 'Print' of the original TChain branch: > > > > root [5] TMBTree->GetBranch("Glob")->Print("") > > *Branch :Glob * > > *Entries : 13865 : BranchElement (see below) * > > *............................................................................* > > *Br 1 :fUniqueID : * > > *Entries : 13865 : Total Size= 68940 bytes File Size = 1414 * > > *Baskets : 14 : Basket Size= 4000 bytes Compression= 39.59 * > > *............................................................................* > > *Br 2 :fBits : * > > *Entries : 13865 : Total Size= 68860 bytes File Size = 1400 * > > *Baskets : 14 : Basket Size= 4000 bytes Compression= 39.99 * > > *............................................................................* > > *Br 3 :_evtno : * > > *Entries : 13865 : Total Size= 68880 bytes File Size = 49526 * > > *Baskets : 14 : Basket Size= 4000 bytes Compression= 1.13 * > > *............................................................................* > > *Br 4 :_runno : * > > *Entries : 13865 : Total Size= 68880 bytes File Size = 2602 * > > *Baskets : 14 : Basket Size= 4000 bytes Compression= 21.50 * > > *............................................................................* > > *Br 5 :_store : * > > *Entries : 13865 : Total Size= 68880 bytes File Size = 2279 * > > *Baskets : 14 : Basket Size= 4000 bytes Compression= 24.55 * > > *............................................................................* > > *Br 6 :_solpol : * > > *Entries : 13865 : Total Size= 68900 bytes File Size = 1418 * > > *Baskets : 14 : Basket Size= 4000 bytes Compression= 39.46 * > > *............................................................................* > > *Br 7 :_torpol : * > > *Entries : 13865 : Total Size= 68900 bytes File Size = 1418 * > > *Baskets : 14 : Basket Size= 4000 bytes Compression= 39.46 * > > *............................................................................* > > *Br 8 :_ticknum : * > > *Entries : 13865 : Total Size= 68920 bytes File Size = 17272 * > > *Baskets : 14 : Basket Size= 4000 bytes Compression= 3.24 * > > *............................................................................* > > *Br 9 :_lumblk : * > > *Entries : 13865 : Total Size= 68900 bytes File Size = 6973 * > > *Baskets : 14 : Basket Size= 4000 bytes Compression= 8.02 * > > *............................................................................* > > *Br 10 :_solcur : * > > *Entries : 13865 : Total Size= 68900 bytes File Size = 1980 * > > *Baskets : 14 : Basket Size= 4000 bytes Compression= 28.26 * > > *............................................................................* > > *Br 11 :_torcur : * > > *Entries : 13865 : Total Size= 68900 bytes File Size = 2299 * > > *Baskets : 14 : Basket Size= 4000 bytes Compression= 24.34 * > > *............................................................................* > > > > and after CopyTree has done its work the branch in the output file is now: > > > > *Branch :Glob * > > *Entries : 326 : BranchElement (see below) * > > *............................................................................* > > *Br 0 :TObject : * > > *Entries : 326 : Total Size= 16976 bytes File Size = 526 * > > *Baskets : 1 : Basket Size= 4000 bytes Compression= 5.95 * > > *............................................................................* > > > > The original class, TMBGlob, is loaded and ROOT clearly recognises it > > since with the original branch I can decode and look at all the entries > > with the class loaded. When I set the branch address I use the command: > > > > SetBranchAddress("Glob",&_ptr); > > > > where _ptr is of type "TMBGlob *" and points to a TMBGlob class instance. > > > > The version of ROOT I am running is v3.03/09. I have tried compiling the > > code under both v03.04/02 and v03.05/00. However there are lots of > > problems with both version from rootcint and, after an initial attempt to > > fix them, I have come to the conclusiosn that this is several days effort > > which is time I don't currently have! > > > > So is there a fix or workaround which I can use with v03.03/09? > > > > Thanks, > > > > Roger >
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