Re: RE : TTree with user defined class

And finally ... if you don't want a dynamically loadable lib, but a totally standalone program. Use the same makefile, but get rid of the

-shared

flag. And provide a main() frame in your code. As you do in the example you sent. Okp, that's it.

John

Bob wrote:
> Thanks a lot ! After some minor modifications everything run fine
> "inside" root.
>
> Right now I'll continue to work like this that but my final goal is to
> be able to run my program as a standalone binary, compiled with
> standard tools, and linked with the Root libraries.
>
> Any idea to make this happen ?
>
> Bob
>
> 2010/9/27 John Idarraga <idarraga_at_cern.ch>:
>
>> Well, if he is compiling with ACLIC
>>
>> .L Sample.h++
>>
>> he doesn't need to load the lib ... it is already loaded.
>>
>> John
>>
>> Ahmed Ali Abdelalim wrote:
>>
>>> Hi Bob,
>>> you compiled and linked now you need to tell ROOT to loaded your library
>>> .To do this you have two ways:
>>> 1- login to root then do
>>> gSystem->Load("libMyLib.so");
>>> before execute your code.
>>> 2- make a root map file ( for ex.: myLib.rootmap) to tell root to load
>>> your library when it starts. the format is trivial like,
>>> Library.TmyLib: libMyLib.so
>>> hth
>>> Cheers,
>>> Ahmed
>>> ##################################################
>>> #Ahmed Ali Abdelalim Phone(Uni):+41223796213
>>> #University of Geneva mobil: +41 78 611 7329 #Physics Section, DPNC
>>> #
>>> #CERN PH/UAT (ATLAS), Phone:+412276 74279 #Office: 40-1-D32
>>> #CH-1211 Geneve 23 Switzerland.
>>> ##################################################
>>>
>>> ------------------------------------------------------------------------
>>> *De:* owner-roottalk_at_root.cern.ch de la part de Bob
>>> *Date:* lun. 9/27/2010 12:41
>>> *À:* roottalk_at_lxroot01.cern.ch
>>> *Objet :* Re: [ROOT] TTree with user defined class
>>>
>>> Thanks John,
>>>
>>> First I moved the class definition to Sample.h then I choose the ACLiC
>>> option to generate the dictionary (.L Sample.h+). I got two new file
>>> Sample_h.so and Sample_h.d
>>>
>>> When I try to run the program I have exactly the same error :
>>> Error in <TTree::Branch>: The pointer specified for debug is not of a
>>> class or type known to ROOT.
>>>
>>> I also tried to link ttree_write.o against the library Sample_h.so but
>>> without success, should I keep going in this way ? I'm a bit lost !
>>>
>>> Thanks,
>>>
>>> Bob
>>>
>>> 2010/9/27 John Idarraga <idarraga_at_cern.ch>:
>>>
>>>> Hello Bob,
>>>>
>>>> Yeah, you need a dictionary, a couple of macros in your source file and
>>>> that's it. Check this out
>>>>
>>>> http://root.cern.ch/drupal/content/interacting-shared-libraries-rootcint
>>>>
>>>> if you have any trouble let me know,
>>>>
>>>> John Idarraga
>>>>
>>>> Bob wrote:
>>>>
>>>>> Hello,
>>>>>
>>>>> I'm a Root beginner, I'm trying to save a class to a TTree. Until now
>>>>> I managed to store and read "simple" type like int and STL objects,
>>>>> but not homemade objects.
>>>>>
>>>>> I'm made a short example :
>>>>>
>>>>> Code snippet :
>>>>>
>>>>> #include <TFile.h>
>>>>> #include <TTree.h>
>>>>> #include <vector>
>>>>> #include <iostream>
>>>>>
>>>>> class Sample {
>>>>> public:
>>>>> int i;
>>>>> std::vector<int> hits;
>>>>> };
>>>>>
>>>>> int main() {
>>>>> Sample *s = new Sample();
>>>>> TFile *f1 = new TFile("debug.root","RECREATE");
>>>>> if (f1->IsZombie()) {
>>>>> std::cerr << "! Unable to create debug.root" <<
>>>>> std::endl;
>>>>> return -1;
>>>>> }
>>>>> TTree *tree = new TTree("T","Debug");
>>>>> //Case C
>>>>> // MyClass object;
>>>>> // TBranch *branch = tree->Branch(branchname, &object,
>>>>> bufsize, splitlevel)
>>>>> //
>>>>> tree->Branch("debug",s);
>>>>> for(int j=0;j<10;j++) {
>>>>> s->hits.empty();
>>>>> for(int i=0;i<100;i++) {
>>>>> s->hits.push_back(42+i);
>>>>> }
>>>>> tree->Fill();
>>>>> }
>>>>> f1->Write();
>>>>> delete s;
>>>>> delete tree;
>>>>> delete f1;
>>>>> return 0;
>>>>> }
>>>>>
>>>>> I compile with
>>>>>
>>>>> g++ -Wall -pedantic -pthread -m32
>>>>> -I/home/bob/root/root-5.26.00d/include -c ttree_write.cxx -o
>>>>> ttree_write.o
>>>>>
>>>>> and I link with
>>>>>
>>>>> g++ -L/home/bob/root/root-5.26.00d/lib -lNew -lCore -lCint -lRIO
>>>>> -lNet -lHist -lGraf -lGraf3d -lGpad -lTree -lRint -lPostscript
>>>>> -lMatrix -lPhysics -lMathCore -lThread -pthread -lm -ldl -rdynamic
>>>>> -L/home/bob/root/root-5.26.00d/lib -lNew -lCore -lCint -lRIO -lNet
>>>>> -lHist -lGraf -lGraf3d -lGpad -lTree -lRint -lPostscript -lMatrix
>>>>> -lPhysics -lMathCore -lThread -lGui -pthread -lm -ldl -rdynamic
>>>>> ttree_write.o -o ttree_write
>>>>>
>>>>> When I run the program I got
>>>>> Error in <TTree::Branch>: The pointer specified for debug is not of a
>>>>> class known to ROOT
>>>>>
>>>>> I'm sure that I miss an important step but I'm out of ideas ! Any tips
>>>>> ?
>>>>>
>>>>>
>>>>>
>>>>
>>
>
>
Received on Mon Sep 27 2010 - 17:46:31 CEST