[Interest] Access QVariant's raw data

[Jonas Gehring]

On 4/8/12 3:29 PM, Thiago Macieira wrote:
> On domingo, 8 de abril de 2012 13.00.28, Jonas Gehring wrote:
>> Hi Thiago,
>>
>> On 4/8/12 5:16 AM, Thiago Macieira wrote:
>>>>   QVariant result = ...;     // Just received from thread
>>>>   QMetaMethod method = ...;  // Pass the result to this method
>>>>   method.invoke(receiver, QGenericArgument(result.typeName(),
>>>>
>>>> result.value<void *>()));
>>>
>>> You're not supposed to use QGenericArgument directly. Use Q_ARG.
>>
>> Thanks for your clarifications. Is there a way to achieve the desired
>> behavior with Q_ARG? The main point is that I don't know the actual type
>> of the result, but the QVariant does (although not via templates,
>> apparently).
> 
> Then take a look at what Q_ARG does and replicate it for your code. It does 
> not involve value<void *>().

Q_ARG(type, data) is defined as QArgument<type>(#type, data), but I
can't write it that way since I don't have the actual type of result and
thus can't use templates.

Anyway, I managed to achieve the desired behaviour by constructing a
QGenericArgument whit QVariant.constData(). If you happen to know
another way to manage this without templates, please let me know.

Regards,
Jonas

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