How to export a C++ method to QML?

[useryy2]

I write a c++ extension to QML.

Now the property "name" can be referenced in QML/JS file.

But how can I make the method "void abc()" also available in QML/JS file?

Currently, the error note is:
logic.js:30: TypeError: Result of expression 'filereader.abc' [undefined] is not a function.

class FileReader: public QObject
{
    Q_OBJECT
    Q_PROPERTY(QString name READ name WRITE setName )
    Q_PROPERTY(int counter READ counter)
  
public:
    FileReader(QObject* parent = 0);
    
    QString name();
    int counter();

    void setName(QString str);

    void abc();
private:
    QString m_name;
    int     m_counter;
}