Hi Rooters,
I've written a small class to read a file and display plot
and another stuff. This class contains a TTree object which
is created by the default constructor of MyClass by
TTree fList("fList","Test") it has been previously declared
in the class definition with TTree *fList. But I can't
use this tree in the other functions of the class, e.g.
void Print() {
fList->Print();
}
In a root session
[root][1].L MyClass.C
[root][2] MyClass t("f72_r1.rep");
[root][3] t->Print();
Error: illegal pointer to class object fList 0x0 17 FILE:MyClass.h LINE:165
*** Interpreter error recovered ***
I can understand what is the error I think it is because
fList is built afterwards. It works if I declare the ntuple
as a main variable TTree tree("fList","Test") in MyClass.C and
adding fList = tree in the constructor. I would like to avoid such
a solution. Do you see any other ? What I don't understand is that all
other declared types work (Int_t Float_t,...).
The whole code I used is below.
I'm sorry if this has been already asked in roottalk but I didn't manage to find it.
I've also two short question :
- What is the status of Root GUI use under Windows ?
- Is there someone using Root libraries with Labview ? (I've already asked this question some time ago)
------MyClass.h
#include <TChain.h>
#include <TFile.h>
#include <TSelector.h>
#include <iostream.h>
#include <stdio.h>
#include <strstream.h>
#include <fstream.h>
#include <string.h>
class MyClass {
public:
Char_t name[32];
Int_t nList=0;
Int_t nWords;
Int_t nAcc;
Int_t Accorl[12];
Int_t Accorc[12];
Int_t wFormat;
Int_t tCM1;
Int_t tCM3;
Int_t tT0;
Float_t TCres;
TTree *fList;
Int_t num;
char fName[32];
Int_t CM1;
Int_t CM3;
Int_t T0;
Int_t Tout;
Int_t Tot;
Int_t runtime;
Char_t date[32];
Bool_t sel;
TBranch *b_num;
TBranch *b_fName;
TBranch *b_CM1;
TBranch *b_CM3;
TBranch *b_T0;
TBranch *b_Tout;
TBranch *b_T0;
TBranch *b_runtime;
TBranch *b_date ;
TBranch *b_sel;
//
MyClass (char *filename);
~MyClass ();
void Print();
Bool_t Select(Int_t idfile);
};
//Default constructor
MyClass::MyClass (char *filename){
//open the report file and fille all the structure
nAcc = 0;
ifstream file(filename);
if(!file) {
cout << "Report File not found " << endl;
break;
}
Int_t nlines = 0;
TString line;
// skip lines
for(int kk=0;kk<3;kk++) {
line.ReadLine(file);
}
line.ReadToDelim(file, '\t');
line.ReadToDelim(file, ' ');
// Number of words
nWords = atoi(line.Data());
line.ReadToDelim(file, ' ');
line.Remove(0,1);
// Format of words
wFormat = atoi(line.Data());
line.ReadLine(file);
line.ReadLine(file);
line.ReadToDelim(file,'\t');
// Read accordeon
for(int kk=0;kk<12;kk++) {
line.ReadToDelim(file, '\t');
Accorl[kk]=atoi(line.Data());
if ( Accorl[kk]!=0) nAcc++;
//cout << "nacc = " << nAcc <<" Accorl[kk]=" << Accorl[kk]<<" kk=" <<kk << endl;
}
line.ReadToDelim(file, '\t');
line.ReadToDelim(file, '\t');
for(int kk=0;kk<12;kk++) {
line.ReadToDelim(file, '\t');
if (Accorl[kk]!=0) Accorc[kk]=atoi(line.Data());
//cout << "nacc = " << nAcc <<" Accorc[kk]=" << Accorc[kk]<<" kk=" <<kk << endl;
}
line.ReadToDelim(file, '=');
line.ReadLine(file);
// Time-Coder Resolution
TCres=atof(line.Data());
// Compute real accordeon compression in ns and Accordeon length in channels
for (kk=0;kk<nAcc; kk++) {
Accorc[kk] = TMath::Power(2,Accorc[kk]);
Accorc[kk] *= TCres;
Accorl[kk]*=1024;
}
// Skip header
for (kk=0;kk<6; kk++) {
line.ReadLine(file);
}
// Create Ntuple
TTree fList("fList","fList");
fList->Print();
fList->Branch("num",&num,"number");
fList->Branch("fName",&fName,"lst filename");
fList->Branch("CM1",&CM1,"CM1");
fList->Branch("CM3",&CM3,"CM3");
fList->Branch("T0",&T0,"T0");
fList->Branch("Tout",&Tout,"Tout");
fList->Branch("Tot",&Tot,"Tot");
fList->Branch("runtime",&runtime,"runtime");
fList->Branch("date",date,"date");
fList->Branch("sel",&sel,"selected");
// Fill ntuple
while (file) {
line.ReadToDelim(file,'\t');
num = atoi(line.Data());
line.ReadToDelim(file,'\t');
strcpy(fName,line.Data());
line.ReadToDelim(file,'\t');
strcpy(date,line.Data());
line.ReadToDelim(file,'\t');
line.ReadToDelim(file,'\t');
line.ReadToDelim(file,'\t');
runtime = atoi(line.Data());
line.ReadToDelim(file,'\t');
line.ReadToDelim(file,'\t');
line.ReadToDelim(file,'\t');
line.ReadToDelim(file,'\t');
line.ReadToDelim(file,'\t');
line.ReadToDelim(file,'\t');
line.ReadToDelim(file,'\t');
line.ReadToDelim(file,'\t');
CM1 = atoi(line.Data());
line.ReadToDelim(file,'\t');
CM3 = atoi(line.Data());
line.ReadToDelim(file,'\t');
line.ReadToDelim(file,'\t');
T0 = atoi(line.Data());
line.ReadToDelim(file,'\t');
Tout = atoi(line.Data());
line.ReadToDelim(file,'\t');
Tot = atoi(line.Data());
line.ReadToDelim(file,'\n');
sel = kTRUE;
fList->Fill();
tCM1 +=CM1;
tCM3 +=CM3;
tT0 +=T0;
}
cout << tT0 << endl;
}
MyClass::~MyClass() {
}
MyClass::Print() {
fList->Print();
}
-----MyClass.C
#include "MyClass.h"
{
}
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