Question

I have a QVariant object within a QTreeWidgetItem, how can I cast it to my own object?

Answer 1

you need to declare somewhere in an .h file the following:

Q_DECLARE_METATYPE(MyStruct) 

and then you can just use:

MyStruct s; QVariant var; var.setValue(s); // copy s into the variant  // retrieve the value MyStruct s2 = var.value<MyStruct>(); 

see the docs here