c++ - movetothread 可访问

Question

我有以下类(class):

class commMonitor : QObject
{
    Q_OBJECT
public:
    commMonitor();
    ~commMonitor();
private:
    QMap<unsigned short int, QTimer*> Monitors;
    QTimer* currTimer;
public slots:
    void createMonitor(unsigned short int);
    void deleteMonitor(unsigned short int);
    void startMonitor(unsigned short int);
    void stopMonitor(unsigned short int);

};

当我尝试执行以下操作时:

commMonitor* commOverWatch = new commMonitor();
QThread* monitorThread = new QThread();
commOverWatch->moveToThread(monitorThread);

Visual Studio 无法编译，错误是 QObject::moveToThread 不可访问。

这里出了什么问题？

Answer 1

在 C++ 中，class commMonitor : QObject 表示私有(private)继承(默认情况下)，因此您不能在您的案例中使用公共(public)成员。我希望你熟悉继承规则。如果没有，see this question.如您所见，在您的例子中，moveToThread() 是一个私有(private)方法，当然您不能在类外访问它。

解决方案:显式指定公共(public)继承:

class commMonitor : public QObject
{
    Q_OBJECT
public:
    commMonitor();
    ~commMonitor();
private:
    QMap<unsigned short int, QTimer*> Monitors;
    QTimer* currTimer;
public slots:
    void createMonitor(unsigned short int);
    void deleteMonitor(unsigned short int);
    void startMonitor(unsigned short int);
    void stopMonitor(unsigned short int);

};