Dear Rooters: I have one problem about how to fill a file, I use MakeSelector to generate two files: for example my.C and my.h, now I want to analyze some events, and fill some histograms, then store all histograms to one root file. The following is my code: #include "my.h" #include "TH2.h" #include "TStyle.h" #include "TCanvas.h" void my::Begin(TTree *tree) { //create a root file to put some histograms TFile *outfile = new TFile("histogram.root", "recreate"); Init(tree); TString option = GetOption(); } Bool_t my::ProcessCut(Int_t entry) { // Selection function // entry is the entry number in the current Tree // Read only the necessary branches to select entries. // return as soon as a bad entry is detected. // to read complete event, call fChain->GetTree()->GetEntry(entry) return kTRUE; } void my::ProcessFill(Int_t entry) { // function called for selected entries only // entry is the entry number in the current Tree // read branches not processed in ProcessCut and fill histograms // to read complete event, call fChain->GetTree()->GetEntry(entry) my code here, it creates many histograms } void my::Terminate() { //write all histograms into the root file outfile -> Write(); outfile -> Close(); } Error message is: No symbol outfile -> Write() what is the problem? I think maybe I put TFile *outfile=new TFile() in the wrong place, where should I put it? can anyone help me? Jim
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