Re: application

Hi John,

Then using gApplication should be safe and not lead not any crash. Can you tell enough information for me to try to reproduce your problem?

Thanks,
Philippe.

John Idarraga wrote:
> Hell Philippe,
>
> I am using root.exe
>
> John
>
> On Wed, 2009-11-25 at 12:59 -0600, Philippe Canal wrote:
>
>> Hi John,
>>
>>
>>> - Code that works: I call 'new TApplication(...)
>>> The constructor complains, but it
>>> still give me a new instance and my program runs well.
>>>
>> It is strange that you both have the complaint __and__ a non
>> functioning gApplication (see below though)
>>
>>
>>> I am writing an application that is using the ROOT library.
>>>
>> Are you using your own main function or are you using root.exe?
>>
>> If you have your own main function, the proper thing to do is
>> to create a TApplication object (or a TRint object) as early
>> as possibly in the main function. If you do not create a
>> TApplication object, one will be created for you when ROOT needs
>> it (but accessing gApplication or GetApplication does not provoke
>> this loading).
>>
>> Cheers,
>> Philippe.
>>
>> PS. If gApplication is not null, it should be functional and useable.
>>
>>
>> John Idarraga wrote:
>>
>>> Hello Philippe,
>>>
>>> Thanks for your answer, here:
>>>
>>> - Code that do not work: When I use gApplication. Do I need to call
>>> anything else. Call a member of gApplication or something ?
>>>
>>> - Code that works: I call 'new TApplication(...) inside my code and use
>>> that pointer instead of gApplication. The constructor complains, but it
>>> still give me a new instance and my program runs well.
>>>
>>> thanks,
>>>
>>> John Idarraga
>>>
>>> On Wed, 2009-11-25 at 12:29 -0600, Philippe Canal wrote:
>>>
>>>
>>>> Hi John,
>>>>
>>>>
>>>>
>>>>> I do so, and I get a valid pointer, but when doing this, my program crashes.
>>>>>
>>>>>
>>>> I do not quite understand the code that works and the code that do not work.
>>>>
>>>> The unique TApplication object can (should) always be access via
>>>> gApplication.
>>>>
>>>> Cheers,
>>>> Philippe
>>>>
>>>>
>>>> John Idarraga wrote:
>>>>
>>>>
>>>>> Hello people,
>>>>>
>>>>> Little question. I am writing an application that is using the ROOT
>>>>> library. I still want to run my library making instances of my objects
>>>>> from CINT and steering the run from there. At some point I need to get
>>>>> a handle on a TApplication object. Since I am not providing the 'main'
>>>>> call of my application because I am running with CINT, that object
>>>>> should already exist, right ? I see that ROOT has already instantiated
>>>>> and object of the class TApplication and I can get a pointer to it
>>>>> through the global gApplication pointer or through
>>>>> gROOT->GetApplication(). I do so, and I get a valid pointer, but when
>>>>> doing this, my program crashes.
>>>>>
>>>>> I couldn't do much with gdb to find out what was going on. But if
>>>>> instead I try to build a new instance of TApplication myself, the
>>>>> constructor of TApplication tells me "only one instance of TApplication
>>>>> allowed", but still delivers me a new object and this one let me work
>>>>> without crash. I am surely miss-understanding something here. Any
>>>>> ideas ?
>>>>>
>>>>> thanks,
>>>>>
>>>>> John Idarraga
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>
>>>
>
>
Received on Wed Nov 25 2009 - 20:28:00 CET