Qt编写、调用回调函数

一、编写一个具有回调函数的模块

call.h

#ifndef CALL_H
#define CALL_H
#include 
#include 
#include 
#include "windows.h"

class call : public QObject
{
    Q_OBJECT
public:
    explicit call(QObject *parent = nullptr);
    void setCallbackFunc(void(*func)(QPoint point));
private:
    QTimer *timer;
    void(*m_callbackFunc)(QPoint point);
private slots:
    void timerout();
};

#endif // CALL_H

call.cpp

#include "call.h"

call::call(QObject *parent) : QObject(parent)
{
    timer = new QTimer;
    connect(timer,&QTimer::timeout,this,&call::timerout);
    timer->start(1000);
}

void call::setCallbackFunc(void (*func)(QPoint))
{
    m_callbackFunc = func;
}

void call::timerout()
{
//定时器每秒获取一次当前鼠标坐标
    POINT point;
    GetCursorPos(&point);
    QPoint poi;
    poi.setX(point.x);
    poi.setY(point.y);
    m_callbackFunc(poi);
}

使用call模块，并监听回调函数

widget.h

#ifndef WIDGET_H
#define WIDGET_H

#include 
#include 
#include "call.h"

QT_BEGIN_NAMESPACE
namespace Ui { class Widget; }
QT_END_NAMESPACE

class Widget : public QWidget
{
    Q_OBJECT

public:
    Widget(QWidget *parent = nullptr);
    ~Widget();

private:
    Ui::Widget *ui;
    static void getPoint(QPoint point);//回调函数监听函数
    call *m_call;
};
#endif // WIDGET_H

widget.cpp

#include "widget.h"
#include "ui_widget.h"

Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);
    m_call = new call(this);
    m_call->setCallbackFunc(getPoint);
}

Widget::~Widget()
{
    delete ui;
}

void Widget::getPoint(QPoint point)
{
    qDebug()<<point;
}

运行后每秒打印一次当前鼠标位置