Hi Valery,
The new optional library libHbook uses the same technique
that I used in h2root. The class THbookFile is the only class
depending directly from the Hbook/Zebra routines from CERNLIB.
The link procedure to build the library uses the same
libraries than h2root (libPacklib,libKernlib). These libraries
can be 3 years old libs or the latest libs from CERNLIB.
THbookFile uses directly calls to the original Hbook/Zebra
libraries. You should not see any side-effects with this.
libHbook.so is prelinked with CERNLIB.
If you do not have CERNLIB, it does not matter. You should be
able to use the new classes without linking yourself with CERNLIB
if you use the binary distributions.
I did not test yet these new classes on Windows, but I do not
expect any problems on this platform.
I expect that most people will use this new library by
dynamic linking with:
gSystem->Load("libHbook");
Rene Brun
On Wed, 20 Feb 2002, Valeri Fine wrote:
> Hello Rene,
>
> Can you elaborate whether a new share library is linked against of any
> CERNLIB libraries Since many ROOT-based our application need CERNLIB as well
> including a share library that is linked with CERNLIB may cause some "side effect"
> we would like to avoid.
>
> Thank you, Valeri
> -----
> Dr.Valeri Fine
> STAR/US Atlas E-mail: fine@bnl.gov
> Brookhaven National Lab Phone: +1 631 344 7806
> Upton, NY 11973-5000 FAX: +1 631 344 4206
> USA
>
>
>
> ----- Original Message -----
> From: "Rene Brun" <Rene.Brun@cern.ch>
> To: <roottalk@pcroot.cern.ch>; <pclark@SLAC.stanford.edu>
> Sent: Wednesday, February 20, 2002 12:58 PM
> Subject: [ROOT] Hbook/PAW files now readable from ROOT
>
>
> > Dear Rooters,
> >
> > A set of classes allowing to read directly Hbook files in ROOT
> > are now available in the CVS development version. The classes are:
> > -THbookFile: an Hbook file object
> > -THbookTree: an Hbook Ntuple (Row or Column-Wise)
> > -THbookBranch: an ntuple column
> > -THbookKey: service class to browse Hbook directories
> > The new classes are in a separate optional shared lib libHbook.so
> >
> > With these classes, one can:
> > - import automatically any 1-d, 2-d or profile histograms. The Hbook types
> > are converted on the fly to Root types TH1F, TH2F and TProfile.
> >
> > - import ntuple headers (Row or Column-Wise).
> > A new data type THbookTree (deriving from TTree) with functions like
> > hbookTree.Draw("x","selection") like for a normal TTree. The ntuple data
> > are read directly from the Hbook file.
> >
> > - The Tree viewer can be used directly: hbookTree.StartViewer();
> >
> > - Browse the THbookFile via TBrowser. Clicking on a Hbook ID in a file
> > draws the histogram.
> >
> > - When in the browser, the context menu item "Convert2root" can be selected
> > to convert a THbookFile into a normal TFile (via h2root). The converted file
> > is by default connected to the browser.
> >
> > Example:
> > gSystem->Load("libHbook");
> > THbookFile f("myfile.hbook");
> > f.ls();
> > TH1F *h1 = (TH1F*)f.Get(1); //import histogram ID=1 in h1
> > h1->Fit("gaus");
> > THbookTree *T = (THbookTree*)f.Get(111); //import ntuple header
> > T->Print(); //show the Hbook ntuple variables
> > T->Draw("x","y<0"); // as in normal TTree::Draw
> > T->StartViewer();
> >
> > I have tested these classes on several Hbook files containing histograms
> > and ntuples of various complexity.
> >
> > Note that a THbookFile is a read only file.
> >
> > I would appreciate feedback on these classes.
> >
> > Rene Brun
> >
>
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