"Warning: invalid memory pointer passed to a callee: t_T->GetEntry(ievt);"

Newbie
1

Hello, I am unsure of why I am receiving the error in the title. In addition to that message, it says “Trying to access a pointer that points to an invalid memory address…” It’s weird that it doesn’t have a problem with long noevt = t_T->GetEntries();, which occurs before the line where I get the error.

I have my full code here.

void AnglevsADC()
{
        TFile * p_infile = new TFile("mergedtests.root");
        TTree * t_T = (TTree *)p_infile->Get("T");

        // Variables and Branches 

        double ph, th;
        double hadc0, hadc1;
        double ladc0, ladc1;
        //long noevt;

        t_T->SetBranchAddress("prex.tr.ph",&ph);
        t_T->SetBranchAddress("prex.tr.th",&th);
        t_T->SetBranchAddress("prex.sbuscint.hadc0",&hadc0);
        t_T->SetBranchAddress("prex.sbuscint.hadc1",&hadc1);
        t_T->SetBranchAddress("prex.sbuscint.ladc0",&ladc0);
        t_T->SetBranchAddress("prex.sbuscint.ladc1",&ladc1);

        long noevt = t_T->GetEntries();
        //cout << "Number of Events is " << noevt << endl;

        // Histograms

        gStyle->SetOptStat("Men");

        TProfile * h_ladc0_ph = new TProfile("ladc0.ph","Low ADC0 Charge vs #phi",2000,-0.5,3000);
        TProfile * h_hadc0_ph = new TProfile("hadc0.ph","High ADC0 Charge vs #phi",2000,-0.5,3000);
        TProfile * h_ladc1_ph = new TProfile("ladc1.ph","Low ADC1 Charge vs #phi",2000,-0.5,3000);
        TProfile * h_hadc1_ph = new TProfile("hadc1.ph","High ADC1 Charge vs #phi",2000,-0.5,3000);

        TProfile * h_ladc0_th = new TProfile("ladc0.th","Low ADC0 Charge vs #theta",2000,-0.5,3000);
        TProfile * h_hadc0_th = new TProfile("hadc0.th","High ADC0 Charge vs #theta",2000,-0.5,3000);
        TProfile * h_ladc1_th = new TProfile("ladc1.th","Low ADC1 Charge vs #theta",2000,-0.5,3000);
        TProfile * h_hadc1_th = new TProfile("hadc1.th","High ADC1 Charge vs #theta",2000,-0.5,3000);

        // Fill Histograms

        for (int ievt = 0; ievt < noevt; ievt++)
        {
                t_T->GetEntry(ievt);

                h_ladc0_ph->Fill(ph,ladc0);
                h_ladc1_ph->Fill(ph,ladc1);
                h_hadc0_ph->Fill(ph,hadc0);
                h_hadc1_ph->Fill(ph,hadc1);

                h_ladc0_th->Fill(th,ladc0);
                h_ladc1_th->Fill(th,ladc1);
                h_hadc0_th->Fill(th,hadc0);
                h_hadc1_th->Fill(th,hadc1);
        }

        TCanvas * c_th = new TCanvas("c_th","c_th",800,800);
        c_th->Divide(2,2);
        c_th->cd(1);
        h_ladc0_th->Draw();
        c_th->cd(2);
        h_ladc1_th->Draw();
        c_th->cd(3);
        h_hadc0_th->Draw();
        c_th->cd(4);
        h_hadc1_th->Draw();

}

Thank you in advance!

2

If you don’t know how to deal with your tree, see how various flavours of automatically generated “analysis skeletons” deal with it.