can you send compilable code that reproduces this problem. I will try here.
________________________________
From: interest-bounces+pritam_ghanghas=infosys....@qt-project.org
[interest-bounces+pritam_ghanghas=infosys....@qt-project.org] on behalf of
Aekold Helbrass [helbr...@gmail.com]
Sent: Friday, April 05, 2013 4:45 PM
To: Qt-interest Interest
Subject: Re: [Interest] QVariant cannot take custom type
Ok, I've tried this one:
QVariant var(QMetaType::QObjectStar, &item);
and it almost works. Pointer somehow gets crippled after using
QMetaProperty.write. When Item* is created originally - address is 0x1b952fo.
But into Holder it is written as 0x1b95480.
Is is even possible? Maybe I'm constructing QMetaProperty not as intended?...
On Fri, Apr 5, 2013 at 2:00 PM, Pritam Ghanghas
<pritam_ghang...@infosys.com<mailto:pritam_ghang...@infosys.com>> wrote:
use gdb and see where exactly it segfaults. That will give better pointers than
random guesses.
You can try posting backtrace here.
________________________________
From:
interest-bounces+pritam_ghanghas=infosys....@qt-project.org<mailto:infosys....@qt-project.org>
[interest-bounces+pritam_ghanghas=infosys....@qt-project.org<mailto:infosys....@qt-project.org>]
on behalf of Aekold Helbrass [helbr...@gmail.com<mailto:helbr...@gmail.com>]
Sent: Friday, April 05, 2013 4:15 PM
To: Conti Manuele
Cc: Qt-interest Interest
Subject: Re: [Interest] QVariant cannot take custom type
Thanx, that one was close, but still segfault:
QSharedPointer<Item> pointer(item);
QVariant var = QVariant::fromValue(pointer);
list.append(var);
On Fri, Apr 5, 2013 at 1:33 PM, Conti Manuele
<conti...@alice.it<mailto:conti...@alice.it><mailto:conti...@alice.it<mailto:conti...@alice.it>>>
wrote:
Hi All,
There is a problem in your code, actually I use this and work perfectly:
Q_DECLARE_METATYPE(QSharedPointer<QPlcServerSocket::QExternalCommand>)
qRegisterMetaType< QSharedPointer<QPlcServerSocket::QExternalCommand> >();
Bye
On 04/05/2013 12:27 PM, Samuel Gaist wrote:
> He explains how to handle QObject * so a pointer to QObject instance, not a
> QObject instance.
>
> On 5 avr. 2013, at 12:22, Aekold Helbrass wrote:
>
>> So, it is absolutely impossible to use QObject-derived class with QVariant?
>> I'm storing QList of pointers already, and I want to write that with
>> QMetaProperty. The only thing that needs copy-constructor, in my
>> understanding, is qRegisterMetaType invocation.
>>
>> I even read an article where guy explains how to get other types than one
>> you're storing, so it looks like there is no problem in storing QObject in
>> QVariant, but for some reason it doesn't work for me:
>> http://steveire.wordpress.com/2011/03/16/implementing-qvariantqmetatype-features-with-template-tricks/
>>
>>
>> On Fri, Apr 5, 2013 at 12:44 PM, André Somers
>> <an...@familiesomers.nl<mailto:an...@familiesomers.nl><mailto:an...@familiesomers.nl<mailto:an...@familiesomers.nl>>>
>> wrote:
>> Op 5-4-2013 11:39, Sven Bergner schreef:
>>> Hello,
>>> you can use a custom type with QVariant by declaring it
>>> using Q_DECLARE_METATYPE ( Type ).
>>> Hope that helps.
>>>
>> It does not. That was already in the code posted in the opening post. As
>> noted by others, the issue lies with trying to use a QObject derived
>> class here.
>>
>> André
>>
>> --
>> You like Qt?
>> I am looking for collegues to join me at i-Optics!
>>
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