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{{KBCS}}
{{CodeSnippet
|id=CS001427
|platform=S60 3rd Edition, FP1, FP2<br>S60 5th Edition
|devices=Nokia 5800 XpressMusic
|category=Qt for Symbian
|subcategory=Base/System
|creationdate=June 16, 2009
|keywords=QThread
}}

==Overview==

This code snippet demonstrates how to implement platform-independent threads in Qt by using the <tt>QThread</tt> class. Instead of starting in <tt>main()</tt>, the execution of QThreads begins in <tt>run()</tt>. By default, <tt>run()</tt> starts the event loop by calling <tt>exec()</tt>.

'''Note''': In order to use this code, you need to have Qt for S60 installed on your platform.


==Preconditions==

* Install latest Qt for S60 see [http://wiki.forum.nokia.com/index.php/Qt_for_S60_-_Installation_packages Qt for S60 - Installation packages]
* Check this link for installation guide: [http://pepper.troll.no/s60prereleases/doc/install-s60.html How to install the package].
* Go through this article: [[Getting started with Qt for S60]]


==Header (mythread.h)==

<code cpp>
#include <QObject>
#include <QThread>

class MyThread : public QThread
    {
    Q_OBJECT
    
    public:
        MyThread(QObject* parent = 0);
        virtual ~MyThread();

    public: // From QThread
        void run();

    signals:
        void dataChanged();
        
    public slots:
        void setData(int someData);
        
    private:
        int data;
    };
</code>


==Source (mythread.cpp)==

<code cpp>
#include "mythread.h"

MyThread::MyThread(QObject* parent) : QThread(parent)
    {
    }

MyThread::~MyThread()
    {
    }
    
void MyThread::run()
    {
    // TODO: there you can run some part of your code in 
    // different thread that rest of the application

    // You can create needed classes here or also in MyThread construction.

    // Thread enters the event loop and waits until exit() is called
    exec();
    }
    
void MyThread::setData(int someData)
    {
    data = someData;
    
    emit dataChanged();
    }
</code>


==Starting thread==

<code cpp>
thread = new MyThread(this);
thread->start();
</code>


==See also==
* [[CS001428 - Using your own class as a signal and slot parameter in QThread]]
* For more information about QThread, see [http://doc.qtsoftware.com/4.5/qthread.html QThread Class Reference].


==Postconditions==

A part of the code is executed in a separate thread.


[[Category:Qt]][[Category:Qt for Symbian]][[Category:Code Examples]][[Category:Base/System]]