回复:Re: TFile::Get problem

Well,it seems to me that it is an issue with the copy constructor function, too.Maybe it has called some static object?

As for the "special reason", I do not quite get your meaning. If you referred that I use an object h1 instead of a pointer that directly get the return value of TFile::Get, well, there's no special reason. I just did it.... But I had to do Get before I can use the hisgram, as it is not visible even if I do an TFile::cd(). To be honest, I am quite confused with the scope concept in ROOT and Cint.......

• 原邮件 ----- 从: Fons Rademakers <Fons.Rademakers_at_cern.ch> 日期: 星期五, 八月 3日, 2007 下午6:14 主题: Re: [ROOT] TFile::Get problem
  > Hi,
  >
  > independent of a possible issue with the TH1 copy, is there a
  > special
  > reason you want to get an additional copy of the histograms?
  >
  > Cheers, Fons.
  >
  >
  > 杨苏立 wrote:
  > > When I use the following code:
  > > TFile f("somefile.root")
  > > TFile g("someotherfile.root")
  > > //open two different root file which contain different
  > histograms with
  > > the same name
  > >
  > >
  > > TH1F h1=*(<dynamic_cast TH1F *>(f.Get("hisname")))
  > > TH1F h2=*(<dynamic_cast TH1F *>(g.Get("hisname")))
  > > //get two different histograms
  > >
  > > the I meet some problem:some data member of h2 has been
  > overfilled with
  > > h1's data
  > >
  > > but if I do
  > > TH1F h2=*(<dynamic_cast TH1F *>(g.Get("hisname")))
  > > TH1F h1=*(<dynamic_cast TH1F *>(f.Get("hisname")))
  > > then it's OK
  > >
  > > who can tell me why?
  > >
  >
  > --
  > Org: CERN, European Laboratory for Particle Physics.
  > Mail: 1211 Geneve 23, Switzerland
  > E-Mail: Fons.Rademakers_at_cern.ch Phone: +41 22 7679248
  > WWW: http://fons.rademakers.org Fax: +41 22 7669640
  >