qt多线程访问同一变量_Qt开发中的几点关键经验及类的元对象反射问题，值得收藏参考...

class TestObject : public QObject
{
    Q_OBJECT 
    Q_PROPERTY(QString text READ text WRITE setText NOTIFY textChange) //Q_PROPERTY 注册成员变量
    Q_PROPERTY(QString text MEMBER m_text NOTIFY textChange) //AAA.注册的成员变量能够响应自定义的signals textChange
public:
    TestObject(QObject* parent);
    ~TestObject();
    void init();

    Q_INVOKABLE QString text(); //注册类的成员函数
    Q_INVOKABLE void setText(const QString& strText);
    QString m_text; //类的成员变量
signals:
    void textChange(); //自定义的signals
public slots:
    void textslot(){qDebug()<<"欢迎关注知乎：武三郎"<<endl;}  //自定义的signals响应的槽函数
};

//=========cpp文件============
TestObject::TestObject(QObject* parent) : QObject (parent)
{
    this->setObjectName("TestObject");
    connect(this, SIGNAL(textChange()),this, SLOT(textslot()));
}
TestObject::~TestObject()
{
}
void TestObject::init()
{
    qDebug()<<"init"<<endl;
}
QString TestObject::text()
{
    return m_text;
}
void TestObject::setText(const QString& strText)
{
    if (m_text == strText)
        return;
    m_text = strText;
//    emit textChange(); //有了AAA那一行，这一句不需要了
}

 TestObject* obj = new TestObject(this);

 qDebug()<<obj->objectName()<<endl; //输出对象的名字

 obj->setProperty("text", "hahaha");    //设置对象的属性
 qDebug()<<obj->property("text").toString()<<endl; //输出对象的属性

    //得到注册的类成员函数
 const QMetaObject* mobj = obj->metaObject();
 qDebug()<<mobj->methodCount()<<endl;
 for(int i = 0; i < mobj->methodCount(); i++)
 {
     QMetaMethod mMethod = mobj->method(i);
     QByteArray byteArray = mMethod.name();
        //输出函数类型与函数名称
     qDebug()<<mMethod.typeName()<<"->"<<QString(byteArray)<<endl; 
 }

   //调用注册的成员函数，通过Q_RETURN_ARG来获取返回值
 qDebug()<<"begin    QMetaObject::invokeMethod"<<endl;
 QString invokeString;
    //调用类的成员函数
 QMetaObject::invokeMethod(obj, "text", Qt::DirectConnection, Q_RETURN_ARG(QString, invokeString));
 qDebug()<<invokeString<<endl;

    // 再次设置text值，可以响应信号
 obj->setProperty("text", "luelueluelue");

QPushButton *btn = new QPushButton;
const QMetaObject *metaobject = btn->metaObject();  //获取元对象
int count = metaobject->propertyCount();  //获取属性的总数量
for (int i = 0; i < count; ++i) 
{
    QMetaProperty metaproperty = metaobject->property(i);
    const char *name = metaproperty.name();
    QVariant value = btn->property(name);
    qDebug() << name << value;
}

//其输出信息如下：
objectName QVariant(QString, "")
modal QVariant(bool, false)
windowModality QVariant(int, 0)
enabled QVariant(bool, true)
geometry QVariant(QRect, QRect(0,0 640x480))
frameGeometry QVariant(QRect, QRect(0,0 639x479))
normalGeometry QVariant(QRect, QRect(0,0 0x0))
......

QPushButton *btn = new QPushButton;
const QMetaObject *metaobject = btn->metaObject();
int count = metaobject->propertyCount();
int index = metaobject->propertyOffset();   //获取属性偏移
for (int i = index; i < count; ++i) 
{
    QMetaProperty metaproperty = metaobject->property(i);
    const char *name = metaproperty.name();
    QVariant value = btn->property(name);
    qDebug() << name << value;
}

VERSION            = V1.23.09.88 
Win32:RC_ICONS     = appIcon.ico

win32 {
  if contains(DEFINES, WIN64) 
  {
      DESTDIR = $${PWD}/../../bin64
  } 
  else 
  {
      DESTDIR = $${PWD}/../../bin32
  }
}

//查找指定类名objectName的控件
QList<QWidget *> widgets = parentWidget.findChildren<QWidget *>("CurrentWidget");
//查找所有QLineEdit
QList<QLineEdit *> allEdits = parentWidget.findChildren<QLineEdit *>();
//只查找一级子控件，不递归
QList<QPushButton *> childButtons = parentWidget.findChildren<QPushButton *>(QString(), Qt::FindDirectChildrenOnly);

QTimer *timer = new QTimer;         // QTimer inherits QObject
timer->inherits("QTimer");          // returns true
timer->inherits("QObject");         // returns true
timer->inherits("QAbstractButton"); // returns false