Hi Rooters, Who can explain what may be wrong when I move a simple code from Alpha (digital unix) on PC (Windows NT4+SP4; VC++6+SP3). The real code is large and it is not interesting. I included here a small test, which gives the same error. A week ago I asked the similar question consernig interpreter and the code worked but on practice it was necessary to translate the code. On Alpha computer it writes and reads the TTree without questions. On PC it writes the TTree, which can be read on Alpha. But it can not read the same file on PC. I got the next ERROR TFile** buf.root TFile* buf.root KEY: TTree T;1 List of arrays Error in <TKey::ReadObj>:Unknown class TTree The first 3 lines comes from the F->ls(); the last comes from the TTree *T = (TTree*)F->Get("T") In my case it is necessary to write file on Alpha and to read it on PC. It is possible but it's not very suitable to write and to read file on PC. The codes are here. Thanks in advance. Andrei //=== testw.cpp #include <TROOT.h> #include <TFile.h> #include <TTree.h> void main() { TROOT test("test","test of file"); int i; struct { unsigned short s_buf[8192]; } buf; TFile *F = new TFile("buf.root","recreate"); TTree *T = new TTree("T","List of arrays"); TBranch *B = T->Branch("B",&buf,"s_buf[8192]/s"); for(i = 0; i < 100; ++i) { buf.s_buf[0] = i; buf.s_buf[i] = i; T->Fill(); } T->Write(); F->Close(); } //=== testr.cpp #include <TROOT.h> #include <TFile.h> #include <TTree.h> #include <stdio.h> #include <stdlib.h> void main() { TROOT test("test","test to read file"); int i,n; struct { unsigned short s_buf[8192]; } buf; TFile *F = new TFile("buf.root","read"); TTree *T = (TTree*)F->Get("T"); if(T == 0) { printf("ERROR TO OPEN TREE \n"); exit(-1); } T->SetBranchAddress("B",&buf); n = T->GetEntries(); printf("%i \n",n); F->Close(); } -- ******************************************************* * Andrei V. Daniel * Department of Physics & Astronomy, P.O. Box 1807-B * Vanderbilt University Tel: (615) 322 2646 * Nashville, TN 37235, USA Fax: (615) 343 7263 *******************************************************
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