【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

 

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