QT線程QThread的使用介紹

第QT線程QThread的使用介紹目錄1.概述2.moveThread示例3.QThread示例4.總結(jié)

1.概述

QThread有兩種使用方式

QObject::moveToThread()派生QThread的子類類

2.moveThread示例

步驟概述：

定義一個(gè)QObject派生類，在派生類中定義一個(gè)槽函數(shù)，此函數(shù)是用于執(zhí)行具體的工作在要使用線程的類中，新建QThread和QObject派生類對(duì)象，并使用moveThread()將派生類的處理交由QThread將觸發(fā)線程工作的信號(hào)與派生類的槽函數(shù)進(jìn)行連接

ThreadWorker.hpp代碼如下:

#ifndefTHREADWORKER_HPP

#defineTHREADWORKER_HPP

#includeQObject

#includeQString

#includeQThread

#includeQDebug

classThreadWorker:publicQObject

Q_OBJECT

public:

ThreadWorker(){}

publicslots:

voidwork(QStringp1)

qDebug()"currentthreadID:"QThread::currentThreadId();

qDebug()p1;

QThread::sleep(10);

qDebug()"threadrunfinish!";

#endif//THREADWORKER_HPP

ThreadController.hpp代碼如下:

#ifndefTHREADCONTROLLER_H

#defineTHREADCONTROLLER_H

#include"ThreadWorker.hpp"

classThreadController:publicQObject

Q_OBJECT

QThreadworkerThread;

public:

ThreadController():QObject()

ThreadWorker*threadWork=newThreadWorker();

//將threadWork移交給workerThread

threadWork-moveToThread(workerThread);

QObject::connect(this,SIGNAL(touchWork(QString)),threadWork,SLOT(work(QString)));

QObject::connect(workerThread,QThread::finished,threadWork,QObject::deleteLater);

workerThread.start();//啟動(dòng)線程

qDebug()"currentthreadID:"QThread::currentThreadId()'\n';

emittouchWork("working");

~ThreadController()

workerThread.quit();

workerThread.wait();

signals:

//發(fā)出信號(hào)觸發(fā)線程

voidtouchWork(QStringp1);

#endif//THREADCONTROLLER_H

main.cpp代碼如下:

#includeQCoreApplication

#include"ThreadController.hpp"

intmain(intargc,char*argv[])

QCoreApplicationa(argc,argv);

ThreadControllertc=ThreadController();

returna.exec();

}

注意：

不能再cpp文件中使用QT的特性機(jī)制如信號(hào)槽，因?yàn)閙oc不會(huì)在cpp文件中處理這些機(jī)制?？梢愿模容^麻煩，建議將類定義在頭文件中即可。

3.QThread示例

方法概述：

定義一個(gè)QThread的派生類，并重載run()函數(shù)，在run()函數(shù)中寫入具體的線程代碼通過(guò)start()啟動(dòng)線程

CustomThread.hpp代碼如下

#ifndefCUSTOMTHREAD_H

#defineCUSTOMTHREAD_H

#includeQThread

#includeQDebug

classCustomThread:publicQThread

Q_OBJECT

public:

CustomThread(){}

signals:

voidcustomThreadSignal();

publicslots:

voidcustomThreadSlot()

qDebug()"currentthreadID(inslotfunction):"QThread::currentThreadId()'\n';

protected:

voidrun()override

qDebug()"currentthreadID:"QThread::currentThreadId()'\n';

QThread::sleep(10);

qDebug()"threadrunfinish!";

emitcustomThreadSignal();

#endif//CUSTOMTHREAD_H

main.cpp代碼如下

#includeQCoreApplication

#include"CustomThread.hpp"

intmain(intargc,char*argv[])

QCoreApplicationa(argc,argv);

qDebug()"mainthreadID:"QThread::currentThreadId();

CustomThreadcustomThread;

QObject::connect(customThread,CustomThread::customThreadSignal,customThread,CustomThread::customThreadSlot);

customThread.start();

returna.exec();

}

輸出結(jié)果：

mainthreadID:0x6508

currentthreadID:0x6544

threadrunfinish!

currentthreadID(inslotfunction):0x6508

4.總結(jié)

moveToThread

此方式，要求把需要進(jìn)行的工作全部封裝在一個(gè)類中，將每一個(gè)任務(wù)定義為一個(gè)槽函數(shù)，并與之對(duì)應(yīng)的信號(hào)進(jìn)行關(guān)聯(lián)，最后調(diào)用moveToThread將此類交QThread對(duì)象。QThread調(diào)用start()進(jìn)行啟動(dòng)，之后每個(gè)任務(wù)由相應(yīng)的信號(hào)進(jìn)行觸發(fā)然后執(zhí)行。

QThread

此方式是要求基于QThread進(jìn)行派生，對(duì)派生類進(jìn)行run()函數(shù)的override。之后調(diào)用start()后，就會(huì)運(yùn)行run()函數(shù)。但是