【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..