[Qt-interest] Few queries on Q_PROPERTY() macro

[Andre Somers]

On 1-7-2010 15:44, Santhosh Y wrote:
> Hi ,
>
> Please see the following class, from which I would like to expose few 
> more interfaces as part of COM object
> ======================================================================================
> // NewGUICOMObj - COM object ;     It is derived from QObject, for 
> adding Q_PROPERTY
> class NewGUICOMObj : public QObject
> {
>         Q_OBJECT
>         Q_PROPERTY(bool visible READ isVisible WRITE setVisible) 
> //This is I am able to write correctly; And also I am able to use from 
> tester side  using this com object
> *         //Q1:  What is wrong with the following Q_PROPERTY declaration*
>         //Q_PROPERTY(char *path  READ readPath WRITE setPath)

I would think the issue is that char* is not a registered type for 
QVariant. There is a constructor for it, but it will result in a QString 
being stored.

>    public:
>         // constructor
>         NewGUICOMObj (char* p, QObject * parent = 0) : ptr_(p), 
> QObject(parent)
>         {
>         }
> *         //Q2: Following Method I would like to expose on COM 
> object*. *Please tell me how to write using Q_PROPERTY*
>          void RenewCallback(eOwner owner)   {...........}
>
> *         // Q3: Following Method also I would like to expose on COM 
> object*. *Please tell me how to write using Q_PROPERTY*
>         int createInstance ()
Ehhh?
Why would you want to expose these as properties? What's the point in 
doing that? Judging by their names, they don't have property-semantics 
either. The first would require a write-only property, and that is not 
possible. Properties are things that you can read on a class instance, 
and often also write. Q3 above looks like you want some kind of static 
constructor for your class, and expose that as a property?

André

-- 
Nokia Certified Qt Developer.
Interested in Qt related job offers or freelance Qt consulting work.

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