Qt 訊號槽傳遞指標

amwha發表於2020-11-08
QT指標

指標定義

#ifndef DEFINE_H
#define DEFINE_H
#include <QMetaType>

struct Message{
    int index;
    int *data;
};
typedef int* iPoint;
Q_DECLARE_METATYPE(Message)
#endif // OBJECT1_H

業務模組1

#ifndef OBJECT1_H
#define OBJECT1_H
#include <QObject>
#include "define.h"
class object1 : public QObject
{
    Q_OBJECT
public:
    explicit object1(QObject *parent = nullptr);
signals:
    void sigSendMsg(const Message&);
public slots:
    void onRevPointer(iPoint);
private:
    class QThread *worker;
    int index_;
};
#endif // OBJECT1_H




#include "object1.h"
#include <QThread>
#include <QTimer>
#include <QDebug>

object1::object1(QObject *parent) : QObject(parent)
{
    index_ = 0;
    QTimer *t = new QTimer(this);
    t->setInterval(1000);
    connect(t,&QTimer::timeout,this,[this](){
        Message msg;
        msg.index = ++index_;
        msg.data = new int[1024*1024];
        sigSendMsg(msg);
        qDebug()<<"send thread:"<<QThread::currentThreadId();
    });

    t->start();
    worker = new QThread();
    worker->setObjectName("object1");
    this->moveToThread(worker);
    worker->start();
}

void object1::onRevPointer(iPoint p)
{
    qDebug()<<p[0];
    delete p;//不刪除會有記憶體洩露
    qDebug()<<Q_FUNC_INFO;
}

業務模組2

#ifndef OBJECT2_H
#define OBJECT2_H
#include <QObject>
#include "define.h"
class object2 : public QObject
{
    Q_OBJECT
public:
    explicit object2(QObject *parent = nullptr);
public slots:
    void onRevMsg(const Message&);
signals:
    void sigSendPointer(iPoint);
private:
    class QThread *worker;
    int index_;
};
#endif // OBJECT2_H
//
#include "object2.h"
#include <QThread>
#include <QTimer>
#include <QDebug>
object2::object2(QObject *parent) : QObject(parent)
{
    index_ = 0;
    QTimer *t = new QTimer(this);
    t->setInterval(1000);
    connect(t,&QTimer::timeout,this,[this](){
        iPoint p = new int [1024*1024];
        p[0] = ++index_;
        sigSendPointer(p);
    });
    t->start();
    worker = new QThread();
    worker->setObjectName("object2");
    this->moveToThread(worker);
    worker->start();
}

void object2::onRevMsg(const Message & msg)
{
    qDebug()<<"rev:"<<msg.index;
    delete msg.data;//不刪除會有記憶體洩露
    qDebug()<<"rev thread:"<<QThread::currentThreadId();
}

連線

#include <QCoreApplication>

#include "object1.h"
#include "object2.h"

#include <QThread>
#include <QDebug>



int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    qDebug()<<"Main thread:"<<QThread::currentThreadId();

    object1 *o1 = new object1;
    object2 *o2 = new object2;
    qRegisterMetaType<Message>("Message");//註冊
    qRegisterMetaType<iPoint>("iPoint");//註冊
    QObject::connect(o1,&object1::sigSendMsg,o2,&object2::onRevMsg);
    QObject::connect(o2,&object2::sigSendPointer,o1,&object1::onRevPointer);

    return a.exec();
}

相關文章