[Interest] Showing QGuiApplication/QML application on a given HWND ref.

[Nuno Santos]

Hey Bo,

Just wanted to share with you some progress.

Actually Qt makes it really simple. I was amazed I could do it with a 
just 5 lines of code. (Qt ROCKS!)

Right now, I just have a problem. The plugin window opens and closes 
perfectly. But once open, if I delete the plug in from the host and the 
QApplication is deleted, it crashes. Still can't figure it why.

See below my simple solution for this case. I problably know it 
yourself. I'm sharing it anyway.

bool IVstWrapperEditor::open(void *ptr)
{
     AEffEditor::open(ptr);

     if (!window)
     {
         window = QWindow::fromWinId((WId)ptr);

         view = new QQuickView(window);
         view->setSource(QUrl(QStringLiteral("qrc:/main.qml")));
         view->rootContext()->setContextProperty("controller", _controller);
         view->show();

         return true;
     }

     return false;
}

void IVstWrapperEditor::close()
{
     if (window)
     {
         qDebug() << "destroying view";
         view->deleteLater();
         view=0;

         qDebug() << "destroying window";
         window->deleteLater();
         window=0;
     }

     AEffEditor::close();
}

Regards,

Nuno

On 03/06/2015 11:56, Nuno Santos wrote:
> In my case I have a related app which opens the plugin.
>
> The host provides a window handle to the plugin.
>
> I was trying to make that handle into a QWidget with the following code:
>
> MyWindow::MyWindow(void* ptr) :
>     QWidget(0)
> {
>     HWND w = (HWND) ptr;
>
>     setGeometry(QRect(0,0,640,480));
>
>     QPalette Pal(palette());
>
>     // set black background
>     Pal.setColor(QPalette::Background, Qt::black);
>     setAutoFillBackground(true);
>     setPalette(Pal);
>
>     create((WId)w, false, false);
> }
>
> The problem is that two windows appear, the one the host provides and 
> the one created by QWidget.
>
> It seems that the create call is not working as intended.
>
> MyWindow subclasses QWidget in order to call the create method since 
> it’s protected.
>
> Do you have any clue why this technic isn’t working?
>
> Thanks,
>
> Nuno Santos
> Founder / CEO / CTO
> www.imaginando.pt <http://www.imaginando.pt>
> +351 91 621 69 62
>
>> On 03 Jun 2015, at 11:37, Bo Thorsen <bo at vikingsoft.eu 
>> <mailto:bo at vikingsoft.eu>> wrote:
>>
>> Den 03-06-2015 kl. 12:35 skrev Nuno Santos:
>>> Thanks for sharing your code.
>>>
>>> I will try and give some feedback.
>>>
>>> Any thoughts regarding the initial approach? Is there any reason for you
>>> not having followed that path?
>>
>> My application inserts an overlay over a complete unrelated 
>> application (the pokerstars or bet365 poker clients actually), so 
>> this is the only approach that can work.
>>
>> Bo Thorsen,
>> Director, Viking Software.
>>
>> -- 
>> Viking Software
>> Qt and C++ developers for hire
>> http://www.vikingsoft.eu
>
>
>
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