7.QT-Qt对象间的父子关系

void QObject::setParent ( QObject * parent );  　　 //设置为parent对象为自己的父对象

const  QObjectList & QObject::children ();  　　　　//返回一个QObjectList(子对象链表),里面保存了子对象地址.

QObject * QObject::parent ();             　　　　 //返回指向父对象的指针

#include <QtCore/QCoreApplication>
#include <QDebug>

class MObj : public QObject
{
};

void func()
{
    MObj *obj1 = new MObj;
    MObj *obj2 = new MObj;
    MObj *obj3 = new MObj;

    qDebug()<<"obj1 ="<<obj1;
    qDebug()<<"obj2 ="<<obj2;
    qDebug()<<"obj3 ="<<obj3;
    qDebug();

    obj2->setParent(obj1);      //设置obj1为obj2的父对象
    obj3->setParent(obj1);      //设置obj1为obj3的父对象

    const QObjectList& list =obj1->children();       //获取obj1 的children list
    for(int i=0; i<list.length();i++)
    {
        qDebug()<<"children list:"<<list[i]<<endl;
    }

    qDebug()<<"obj2 parent:"<<obj2->parent();
    qDebug()<<"obj3 parent:"<<obj3->parent();

}

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);
    func();
    return a.exec();
}

#include <QDebug>
#include <QString>
class MObj : public QObject
{
private:
    QString mvalue;
public:
    MObj(QString i=0):mvalue(i)
    {}
    ~MObj()
    {
        qDebug()<<"~Mobj : "<<mvalue;
    }
};
void func()
{
    MObj *obj1 = new MObj("obj1");
    MObj *obj2 = new MObj("obj2");
    MObj *obj3 = new MObj("obj3");
    MObj *obj4 = new MObj("obj4");
    obj2->setParent(obj1);
    obj3->setParent(obj1);
    obj4->setParent(obj3);
    delete obj3;
}
int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);
    func();
    return a.exec();
}