Hi Yannick,
AS shown in the Event example, you must pass the address
of the pointer and not the value when creating the branch.
I have modified two lines in your program below.
See lines marked //<=========
Rene Brun
On Fri, 5 Nov 1999, Patois Yannick wrote:
> Hi,
>
> I must have missed someting in the way ROOT class I/O can be
> implemented. I really dont understand why this code doesnt work.
>
> It does compile, link and run, but the values are not stored and/or read
> properly.
>
> I spent a lot of time around this problem, looking into the 'Event'
> exemple and such, but I'm really stuck...
>
> Any idea ?
>
> >>> File little_test.cpp
>
> #include <TROOT.h>
> #include <TFile.h>
> #include <TTree.h>
>
> #include "my_event.H"
>
> main ( int argc , char **argv ) {
> TROOT manip_event("test","Test analysis");
> my_event *the_event = new my_event;
> if (argc<2) {
> TFile *root_file = new TFile("toto.root","RECREATE","Test events");
> TTree *test_tree = new TTree("test_tree","Test manip events");
> test_tree->Branch("brut_tsol","my_event",&the_event); //<===========
> for (int i=0;i<10;i++) {
> the_event->set(i);
> test_tree->Fill();
> }
> root_file->Write();
> root_file->Close();
> delete root_file;
> }
> else {
> TFile *hfile = new TFile("toto.root");
> TTree *tree = (TTree*)hfile->Get("test_tree");
> TBranch *branch = tree->GetBranch("brut_tsol");
> branch->SetAddress(&the_event); //<================
> Int_t nentries = (Int_t)tree->GetEntries();
> for (int ev = 0; ev < nentries; ev++) {
> tree->GetEvent(ev);
> the_event->print();
> }
> }
> }
>
>
> >>> File my_event.cpp
>
> #include <iostream.h>
> #include <TROOT.h>
> #include <TNtuple.h>
> #include "my_event.H"
> ClassImp(my_event);
> my_event:: my_event(void) {;}
> my_event::~my_event(void) {;}
> void my_event::set(int a) { T1=a; T2=2*a; }
> void my_event::print(void) { cout << T1 << " " << T2 << endl; }
>
> >>> File my_event.H
>
> #ifndef __my_event__
> #define __my_event__
> class my_event : public TObject {
> public:
> my_event (void);
> ~my_event(void);
> public:
> Float_t T1;
> Float_t T2;
> void set (int a);
> void print(void);
> ClassDef(my_event,1) // The macro
> };
> #endif
>
> >>> File Makefile
>
> CPC = CC -compat=4
> LD = CC -compat=4
> CPCflags = $(shell root-config --cflags)
> ldflags = $(shell root-config --libs)
>
> OBJTEST = little_test.o my_event.o
> OBJDICT = my_event.dict_o
> MYTEST = mytest
>
> all: $(MYTEST)
>
> $(MYTEST): $(OBJTEST) $(OBJDICT)
> @$(LD) $(OBJTEST) $(OBJDICT) $(ldflags) -o $(MYTEST)
>
> .SUFFIXES :
> .SUFFIXES : .cpp .H .C .dict_o .o
>
> .cpp.o:
> @echo compilation of $<
> $(CPC) $(CPCflags) $< -c -o $@
>
> .H.C:
> @echo "Generating dictionary ..."
> @rootcint $@ -c $<
>
> .C.dict_o:
> @echo compilation of dico $<
> $(CPC) $(CPCflags) $< -c -o $@
>
> -------------
> All that was tryed with :
>
> $ uname -a
> SunOS gansrx 5.6 Generic_105181-08 sun4u sparc SUNW,Ultra-1
>
> root says:
> * Version 2.23/08 2 November 1999 *
> (btw, why not adding a --version option to the root program ?)
>
> I modified the RConfig.h file as Bruce O'NEEL suggested to be able to
> compile with the SUN CC5.0 compiler in compat mode.
>
>
> _/ Yannick Patois _________________ Address (home) __________________
> | irc(undernet): Garp on #france25+ | La Villa des Sciences |
> | email : patois@ganil.fr | 12, avenue de Cambridge |
> | web :http://www.sura.org/~patois/ | 14200 Herouville-Saint-Clair |
> | Tel/Fax-home:+33 (0)2 31 94 50 32 | FRANCE |
> |___________________________________|__________________________________|
>
>
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