[Interest] Qt Plugin Low Level API

Tony Rietwyk tony at rightsoft.com.au
Thu May 22 09:58:33 CEST 2014

Hi Etienne, 


The 4.8.5 doco for QObject.qobject_cast links to the "Plug & Paint" example for use of qobject_cast with interfaces.   Mind you, it incorrectly shows the return type as QWidget.  Hopefully that doco has been rewritten in v5! 


Hope that helps, 





From: interest-bounces+tony=rightsoft.com.au at qt-project.org [mailto:interest-bounces+tony=rightsoft.com.au at qt-project.org] On Behalf Of Etienne Sandré-Chardonnal
Sent: Thursday, 22 May 2014 5:37 PM
To: interest at qt-project.org
Subject: [Interest] Qt Plugin Low Level API


Dear all,

I'm reading the doc in order to implement plugins into my Qt 4.8 application.

The manual says that I need first to define the plugin interface as a pure virtual class. In the example it does not inherit QObject.

Then it shows an example plugin implementation which inherits from QObject and the interface class (multiple inheritance)

Then it says "use qobject_cast() to test whether a plugin implement a given interface". However, the qobject_cast page clearly says that the target class type must inherit QObject.

I dit not try compiling an example yet, but how could this work? Shouldn't the interface inherit QObject, and the plugin implementation simply inherit the interface class?



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