Qt-interest Archive, April 2007
Persistence of ActiveQt control
Message 1 in thread
Hi, ActiveQt users,
I turn ImageViewer(“C:\Qt\4.1.1\examples\widgets\imageviewer”) into an
ActiveQt control.
Then, I start PowerPoint and insert the control, and in “Slide Show” use
the control to load an image. It works fine.
After I saw the image I saved the PowerPoint file. I wish next time when
I open the ppt file I can see the image directly --- that is what
“Persistence” means.
What I did with the persistence of an ActiveQt control is by Q_PROPERTY
and set STORED true.
class ImageViewer : public QMainWindow, public QAxBindable
{
Q_OBJECT
Q_PROPERTY( const QByteArray &data READ data WRITE setData STORED true)
public:
ImageViewer();
QByteArray data()const{return m_data;};
bool setData(const QByteArray &data);
. . .
QByteArray m_data;
};
My open file will read the whole image
QByteArray data = file.readAll();
and call setData():
bool ImageViewer::setData(const QByteArray &data)
{
m_data = data;
QImage image = QImage::fromData (data);
imageLabel->setPixmap(QPixmap::fromImage(image)); // for display
propertyChanged( "data" ); // acknowledge
return true;
}
The result is I do not see the image shows up in the ActiveX control.
What's wrong?
Does anyone know the persistence of an activeQt control, or
Storage of Control Persistent Data in Qt?
http://msdn2.microsoft.com/en-us/library/aa768185.aspx
Thanks,
Lingfa
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