QT学习笔记之十八 Threads Qt多线程练习

多线程这个部分看得晕晕的….

随便搞了段代码…

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部分代码如下:

threads.h

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#ifndef THREADS_H
#define THREADS_H
#include <QThread>
class Threads : public QThread
{
Q_OBJECT
public:
Threads();
void setMessage(const QString &message);
void stop();
protected:
void run();
private:
QString messageStr;
volatile bool stopped;
};
#endif // THREADS_H

threads.cpp

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#include <QtCore>
#include <iostream>
#include "threads.h"
Threads::Threads()
{
stopped = false;
}
void Threads::setMessage(const QString &message)
{
messageStr = message;
}
void Threads::run()
{
while(!stopped)
std::cout << qPrintable(messageStr) <<std::endl;
}
void Threads::stop()
{
stopped = true;
}

threadDialog.h

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#ifndef THREADDIALOG_H
#define THREADDIALOG_H
#include <QDialog>
#include "threads.h"
class ThreadDialog : public QDialog
{
Q_OBJECT
public:
ThreadDialog(QWidget *parent = 0);
protected:
void closeEvent(QCloseEvent *event);
private slots:
void startOrStopThreadA();
void startOrStopThreadB();
private:
Threads threadA;
Threads threadB;
QPushButton *threadAButton;
QPushButton *threadBButton;
QPushButton *quitButton;
};
#endif // THREADDIALOG_H

threadDialog.cpp

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#include <QtGui>
#include "threaddialog.h"
ThreadDialog::ThreadDialog(QWidget *parent) : QDialog(parent)
{
threadA.setMessage("Thread A is start");
threadB.setMessage("Thread B is start");
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 *layout = new QHBoxLayout;
layout->addWidget(threadAButton);
layout->addWidget(threadBButton);
layout->addWidget(quitButton);
setLayout(layout);
setWindowTitle(tr("Thread Test"));
}
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();
}

这个程序没有优化,感觉有点站内存的说,看看就好哈

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