Can I get the real type of QVariant params?

Mihan

I want to send a QVariant param (event it's a struct) by a signal, also when it is sent to a slot by a signal, the slot can get the type from this param. How can I achieve.
I have a fool idea that I add a QString to descript the type, or use an enum of type.
Could you give me some suggestions?

VRonin

Register your cutom type with the Meta-Object system using https://doc.qt.io/qt-5/qmetatype.html#qRegisterMetaType-1, save the return integer then you can use QVariant::userType() to check if the variant contains your custom type or not

Mihan

Oh, thank you so much !
BTW, can I connect a normal signal of a widget and a slot with a QVariant param？

Pl45m4

@Mihan said in Can I get the real type of QVariant params?:

BTW, can I connect a normal signal of a widget and a slot with a QVariant param?

Sure you can.

connect(myclass, &MyClass::mySignal, this, &QMainWindow::DoSomething);

where mySignal

void mySignal(QVariant val);

and DoSomething slot:

void QMainWindow::DoSomething(QVariant val)
{
      // Do something with Variant val
}