将信号从工作类连接到控制器类 - QThreads

Question

标题：

#ifndef CONTROLLER_THREAD
#define CONTROLLER_THREAD

#include <QThread>

class Worker : public QObject
{
    Q_OBJECT
public:
    Worker();
    ~Worker();

private slots:
    void calculateImage();

signals:
    void imageReady();
};

class Controller: public QObject
{
public:
    Worker  objWorker;
    QThread objQThread;

    Controller();
    ~Controller();

public slots:
    void receiveImage();
};

#endif // CONTROLLER_THREAD

来源：

#include <controller_thread.h>

Worker::Worker(){}
Worker::~Worker(){}

void Worker::calculateImage()
{

}

Controller::Controller()
{
    objWorker.moveToThread( &objQThread );

    connect( objWorker, objWorker::imageReady, this, receiveImage );

    objQThread.start();
}

Controller::~Controller(){}

void Controller::receiveImage()
{

}

我收到错误消息：

 error: ‘objWorker’ is not a class, namespace, or enumeration
     connect( objWorker, objWorker::imageReady, this, receiveImage );

                     ^

这个错误是什么意思？如何解决？

输入：
connect( objWorker, &Worker::imageReady, this, &Controller::receiveImage );

结果：

error: no matching function for call to ‘Controller::connect(Worker&, void (Worker::*)(), Controller*, void (Controller::*)())

Answer 1

错误在这一行：

connect( objWorker, objWorker::imageReady, this, receiveImage );

在“新”Qt5 语法中，您需要在此处提供类名而不是对象名 - objWorker::imageReady。

所以，你的连接语句应该是这样的：

connect( objWorker, &Worker::imageReady, this, &Controller::receiveImage );

有关“新”Qt5 连接语法的更多帮助，您可以参考here