Hi Rooters, I have some problem when I try to read some histogramms from file: In Root the following code works TFile* file=new root [0] TFile("Triggereff.root","READ"); root [1] TH2D* histo = (TH2D*) file->Get("ST66orST67orST71orST77eff"); root [2] histo->FindBin(0.2,50,0) (Int_t)574 root [3] histo->GetBinContent(574) (Stat_t)1.00000000000000000e+00 but when I wrap the above in a small main program and compile it the same code chrashes ... (includes) TROOT root("Test","file test"); int main(int argc, char* argv[]) { TApplication theApp("App", &argc, argv); cout << "starting program initialisation..."; gROOT->Reset(); cout << " done"; cout << "loading trigger efficiencies..."; TFile* histofile = new TFile("Triggereff.root","READ"); cout << "still living 1" << endl; TH2D* ST66orST67orST71orST77histo = (TH2D*) histofile->Get("ST66orST67orST71or77eff"); cout << "still living 2" << endl; if ( ST66orST67orST71orST77histo == 0 ) cout << "POINTER to histogramm == NULL !" << endl; cout << "still living 3" << endl; cout << ST66orST67orST71orST77histo->FindBin(0.2,50,0) << endl; cout << "still living 4" << endl; ... } with the output starting program initialisation... done loading trigger efficiencies... still living 1 still living 2 POINTER to histogramm == NULL ! still living 3 *** Break *** segmentation violation zsh: 6007 abort publish Does anybody have an idea what I did wrong here ? Thanks in advance, Christian Veelken
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