[Qt-interest] QT plugins, dynamic and static version

[Patric]

I'm using Windows XP and I installed QT trought the SDK provided in the 
site.
I didn't find "symbols" in the wiki article, but thank you, I'll search 
additional info about this. :)

Regards,
Patric



----- Original Message ----- 
From: "Karol Krizka" <kkrizka at gmail.com>
To: "Patric" <userqt at gmail.com>
Cc: "Berry Octave" <octave at octavious.servegame.org>; 
<qt-interest at trolltech.com>
Sent: Saturday, May 30, 2009 6:10 PM
Subject: Re: [Qt-interest] QT plugins, dynamic and static version


On Sat, May 30, 2009 at 4:32 PM, Patric <userqt at gmail.com> wrote:
> I see... Thank you very much for your answer, Berry,
> But where I can configure QT to be build either statically or dynamically 
> ?
When you compile Qt, you can either do:
./compile -static
or just (Qt is compiled as dynamic by default)
./compule

> And what do you mean by "symbols" ?
>
Read http://en.wikipedia.org/wiki/Library_(computing)
It also mentions symbols.

--
Cheers,
Karol Krizka
http://www.krizka.net


> ----- Original Message -----
> From: "Berry Octave" <octave at octavious.servegame.org>
> To: <qt-interest at trolltech.com>
> Sent: Friday, May 29, 2009 5:19 PM
> Subject: Re: [Qt-interest] QT plugins, dynamic and static version
>
>
>> Le Friday 29 May 2009 12:41:11 Parker, vous avez écrit :
>>> Hello all,
>>> I have an application with tabs, and I want these tabs to be generated
>>> dynamically, i.e. when you click a button, there will be new tab
>>> appearing,
>>> some other is changing, etc. So, I need to define each tab as separate
>>> class and load it dynamically. But what to use ? I want when the
>>> application is installed, if there is the need of adding additional
>>> functionalities, just to place one file in the program's folder and then
>>> the new functionality (tab for instance) to be loaded. Or something like
>>> that. I think I'll be able to do it with dynamic libraries, or QT 
>>> plugins
>>> maybe ? I'm not sure what's the difference, maybe it can be done with 
>>> the
>>> lower-level api of qt plugins OR with dynamic lybraries.
>>>
>>> Also, it is said that there are two versions of QT, dynamic and static ?
>>> What do this means, where I can read about it ?
>>>
>>> I'm using WIndows XP.
>>>
>>> Regards,
>>> Patric
>>>
>>>
>>> __________ Information from ESET NOD32 Antivirus, version of virus
>>> signature database 4098 (20090522) __________
>>>
>>> The message was checked by ESET NOD32 Antivirus.
>>>
>>> http://www.eset.com
>>
>>
>> Hi,
>>
>> In fact, there are few differences between a dynamic library and a Qt
>> plugin.
>>
>> A library is used to be a set of functions that a program is allowed to
>> use.
>> The difference between a static and a dynamic library is quite simple.
>> With a
>> static library, the whole library code is included in the executable at
>> link
>> time. Wherhas, on a dll, the code is resolved at runtime (by the linker 
>> or
>> by
>> the program itself).
>>
>> Qt can be built as a static and as a dynamic library. In fact, with a
>> simple
>> recompilation, the programs can use both kind of libraries (beacause it's
>> the
>> linker's job to do that, at compile time (for static libs) or at the
>> program
>> startup).
>>
>> The last case is when a program load itself a dll. I mean it has to
>> resolve
>> the symbols by itself. (see man dlopen for the unix implementation as an
>> example).
>>
>> But symbols are for example a function, not a whole class.
>>
>> In order to use a dll using this way in a C++ program, you have to make
>> some
>> more gymnastic, that the Qt plugins abstraction does for you.
>>
>> To answer to your question, for the use you want to do, you should use Qt
>> plugins.
>>
>> Have a look at
>> http://doc.qtsoftware.com/4.5/tools-plugandpaintplugins-basictools.html
>> for
>> an exemple implementation.
>>
>>
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