QT notes - custom data types

1. When we send data by thread , We often encounter the following situations ：

Translated into ：

QOject::connect Cannot type QVector<int> Parameters of the queue （ Please make sure QVector<int> Registered qRegisterMetaType）

Help document ：

So we try to use qRegisterMetaType To register our customized data

// Register custom data 
qRegisterMetaType<QVector<int>>("QVector<int>");

2. When we use QVariant When using custom data , We often encounter the following situations ：

Help document ：

Set the custom type to QVariant, We usually use Q_DECLARE_METATYPE This macro , Need to be defined outside the class , It takes effect after this custom type , Otherwise, an error will be reported

struct Person
{
    
	QString name;
	int age;
	int score;
	QString className;
};
Q_DECLARE_METATYPE(Person)