QML 与 QT之间的传值问题

[tony2278]

//MyClass.h
#include <QObject>
class MyClass : public QObject
{
    Q_OBJECT
    Q_INVOKABLE QString GetPath1();
    Q_INVOKABLE QString GetPath2();

public:
    MyClass();

private:
    QString m_Pathdir;
    QString m_Filename1;
};


//main.cpp
#include "myclass.h"
int main(int argc, char* argv[])
{
    QGuiApplication app(argc, argv);

    qmlRegisterType<MyClass>("Qt.MyClass", 1, 0, "MyClass");
    QQmlApplicationEngine engine;
    engine.load(QStringLiteral("path.qml"));

    return app.exec();
}


//path.qml
import Qt.MyClass 1.0
Window
{
    id: root
    visible: true
    
    MyClass
    {
        id: myClass
    }

    property string pathdir: myClass.GetPath1()
    property string fileName2: myClass.GetPath2()
}

编译没有问题，但是在运行的时候报错：
path.qml: TypeError: Property 'GetPath1' of object MyClass(0x55c01ca599e0) is not a function
path.qml: TypeError: Property 'GetPath2' of object MyClass(0x55c01ca599e0) is not a function

请问应该怎样解决？谢谢！

另外：使用 import Qt.MyClass 1.0 这种形式，应该在哪里 new 一个 class MyClass 实例出来呢？

[tony2278]

我把它改成以下这种方式，好像 Working 了！

class MyClass : public QObject
{
    Q_OBJECT
    Q_PROPERTY(QString mypath READ GetPath1 WRITE setMember3 )

public:
    MyClass();
    Q_INVOKABLE QString GetPath1();
    Q_INVOKABLE QString GetPath2();
    Q_INVOKABLE void setMember3( const QString& mem3 ); //This is Empty function

public slots:
    void cppSlot(int number);

private:
    QString m_Pathdir;
    QString m_Filename1;
};

[tony2278]

改之前是以下的版本（unworking version）：

//MyClass.h
#include <QObject>
class MyClass : public QObject
{
    Q_OBJECT
    Q_INVOKABLE QString GetPath1();
    Q_INVOKABLE QString GetPath2();
 
public:
    MyClass();
 
private:
    QString m_Pathdir;
    QString m_Filename1;
};

[tony2278]

现在的新问题是： 成员变量 m_Pathdir 和 m_Filename1， 怎样才能在 main.cpp 里面的

// initialize MyClass  m_Pathdir   BY HOW?
// initialize MyClass  m_Filename1  BY HOW?

qmlRegisterType<MyClass>("Qt.MyClass", 1, 0, "MyClass");
    QQmlApplicationEngine engine;
    engine.load(QStringLiteral("path.qml"));

逻辑之前被赋值？

#include "myclass.h"

MyClass::MyClass()
{
    m_Pathdir = "file:///home/tt1/workspace/prd3/";  // not initialize here ,  how can I initialize it in main()?
    m_Filename1 = "20170504102730_0.png";    //  not initialize here , how can I initialize it in main()?
}

QString MyClass::GetPath1()
{
    return m_Pathdir;
}

QString MyClass::GetPath2()
{
    return m_Filename1;
}

//......

[tony2278]

Qt 5.9 Qt Quick C++ Classes QQuickView

[蠓虫带着秤砣飞]

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