【原创】QT编程 多线程

请先保证已安装QT，没有请参考

http://www.cnblogs.com/kavs/p/4608926.html  安装QT。

新建threads文件夹存放项目：mkdir threads

sudo gedit main.cpp

输入如下代码：

#include <QApplication>

#include "threaddialog.h"

int main(int argc, char *argv[]) 
{ 
    QApplication app(argc, argv); 
    ThreadDialog dialog; 
    dialog.show(); 
    return app.exec(); 
}

保存退出文件。
终端输入

sudo gedit threa.cpp

键入代码：

#include <QtCore> 
#include <iostream>

#include "thread.h"

Thread::Thread() 
{ 
    stopped = false; 
}

void Thread::setMessage(const QString &message) 
{ 
    messageStr = message; 
}

void Thread::run() 
{ 
    while (!stopped) 
        std::cerr << qPrintable(messageStr); 
    stopped = false; 
    std::cerr << std::endl; 
}

void Thread::stop() 
{ 
    stopped = true; 
}

保存退出文件。
终端输入

sudo gedit thread.h

键入如下 代码：

#ifndef THREAD_H 
#define THREAD_H

#include <QThread>

class Thread : public QThread 
{ 
    Q_OBJECT

public: 
    Thread();

    void setMessage(const QString &message); 
    void stop();

protected: 
    void run();

private: 
    QString messageStr; 
    volatile bool stopped; 
};

#endif

保存退出文件。
终端输入

sudo  gedit  threaddialog.cpp

键入如下代码：

#include <QtGui>

#include "threaddialog.h"

ThreadDialog::ThreadDialog(QWidget *parent) 
    : QDialog(parent) 
{ 
    threadA.setMessage("A"); 
    threadB.setMessage("B");

    threadAButton = new QPushButton(tr("Start A")); 
    threadBButton = new QPushButton(tr("Start B")); 
    quitButton = new QPushButton(tr("Quit")); 
    quitButton->setDefault(true);

    connect(threadAButton, SIGNAL(clicked()), 
            this, SLOT(startOrStopThreadA())); 
    connect(threadBButton, SIGNAL(clicked()), 
            this, SLOT(startOrStopThreadB())); 
    connect(quitButton, SIGNAL(clicked()), this, SLOT(close()));

    QHBoxLayout *mainLayout = new QHBoxLayout; 
    mainLayout->addWidget(threadAButton); 
    mainLayout->addWidget(threadBButton); 
    mainLayout->addWidget(quitButton); 
    setLayout(mainLayout);

    setWindowTitle(tr("Threads")); 
}

void ThreadDialog::startOrStopThreadA() 
{ 
    if (threadA.isRunning()) { 
        threadA.stop(); 
        threadAButton->setText(tr("Start A")); 
    } else { 
        threadA.start(); 
        threadAButton->setText(tr("Stop A")); 
    } 
}

void ThreadDialog::startOrStopThreadB() 
{ 
    if (threadB.isRunning()) { 
        threadB.stop(); 
        threadBButton->setText(tr("Start B")); 
    } else { 
        threadB.start(); 
        threadBButton->setText(tr("Stop B")); 
    } 
}

void ThreadDialog::closeEvent(QCloseEvent *event) 
{ 
    threadA.stop(); 
    threadB.stop(); 
    threadA.wait(); 
    threadB.wait(); 
    event->accept(); 
}

保存退出文件。
终端输入

sudo  threaddialog.h

键入如下代码：

#ifndef THREADDIALOG_H 
#define THREADDIALOG_H

#include <QDialog>

#include "thread.h"

class QPushButton;

class ThreadDialog : public QDialog 
{ 
    Q_OBJECT

public: 
    ThreadDialog(QWidget *parent = 0);

protected: 
    void closeEvent(QCloseEvent *event);

private slots: 
    void startOrStopThreadA(); 
    void startOrStopThreadB();

private: 
    Thread threadA; 
    Thread threadB; 
    QPushButton *threadAButton; 
    QPushButton *threadBButton; 
    QPushButton *quitButton; 
};

#endif

接下来 开始编译：

在终端进入该项目的文件夹：

开始编译 qmake –project 生成threas.pro文件

键入 qmake threads.pro 生成Makefile文件 键入make

编译程序。编译完成结果

键入./threads

over..