What if the parameters in QT are structs or custom classes when sending signals?

We usually send signal When , It is estimated that the basic type is used more , Sometimes container types are also used , What if you use structs or class objects ？ What do I do ？

And that's where we need to use it qRegisterMetaType Let's declare this class first .

Usage is as follows ：

qRegisterMetaType<MyClass>("MyClass")

Just put your class name in it . As for where to call , Generally, it can be in main Function , It can also be in the class constructor , All in all , It needs to be declared before the signal call .