多线程刷新UI, 用QThreadPool和QRunnable实现

线程池QThreadPool实现多线程, 信号槽实现异步线程刷新UI控件

启动效果

调用是没有问题

这里本来是想打印出线程ID, 不知道怎么用

QString(QThread::currentThread()

输出, 怎么转换成QString

文档结构

线程类

printtask.h

#ifndef PRINTTASK_H

#define PRINTTASK_H

#include <QObject>

#include <QRunnable>

class PrintTask : public QObject, public QRunnable

    Q_OBJECT

signals:

    void notify(QString);

public:

    PrintTask();

    ~PrintTask();

protected:

    void run();

signals:

    //注意！要使用信号，采用QObejct 和 QRunnable多继承，记得QObject要放在前面

    void mySignal();

};

#endif // PRINTTASK_H

printtask.cpp

#include "printtask.h"

#include <QThread>

#include <iostream>

using std::cout;

using std::endl;

PrintTask::PrintTask()

PrintTask::~PrintTask()

//线程真正执行的内容

void PrintTask::run()

    QString printf;

    printf = tr("PrintTask run called");

    //printf.append(QString(QThread::currentThread()));

    //cout << "PrintTask run 被调用，调用线程ID为：" << QThread::currentThread() << endl;

    emit notify(printf);

mainwindow.h

#ifndef MAINWINDOW_H

#define MAINWINDOW_H

#include <QMainWindow>

namespace Ui {

class MainWindow;

class MainWindow : public QMainWindow

    Q_OBJECT

public slots:

   void notify(QString print);

public:

    explicit MainWindow(QWidget *parent = 0);

    ~MainWindow();

private slots:

    void on_pushButton_clicked();

private:

    Ui::MainWindow *ui;

};

#endif // MAINWINDOW_H

mainwindow.cpp

#include "printtask.h"

#include <QThread>

#include <iostream>

using std::cout;

using std::endl;

PrintTask::PrintTask()

PrintTask::~PrintTask()

//线程真正执行的内容

void PrintTask::run()

    QString printf;

    printf = tr("PrintTask run called");

    //printf.append(QString(QThread::currentThread()));

    //cout << "PrintTask run 被调用，调用线程ID为：" << QThread::currentThread() << endl;

    emit notify(printf);

这里的传送类型可以随便设置, int 或者 QString.