Run a new thread Qt C++

Question

i want to run code in a seperate thread of the main application, for that i hava created some file :

thread2.h

#ifndef THREAD2_H
#define THREAD2_H
#include <QThread>

class thread2 : public QThread
{
    Q_OBJECT

public:
    thread2();

protected:
    void run();

};

#endif // THREAD2_H

thread2.cpp

#include "thread2.h"

thread2::thread2()
{
    //qDebug("dfd");
}
void thread2::run()
{
    int test = 0;
}

And the main file called main.cpp

#include <QApplication>
#include <QThread>
#include "thread1.cpp"
#include "thread2.h"

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    thread2::run();

    return a.exec();
}

But it dosen't work...

Qt Creator tell me : "cannot call member function 'virtual void thread2::run()' without object"

Thanks !

Solution 1

Invoking it like this: thread2::run() is how you would call a static function, which run() is not.

Also, to start a thread you don't call the run() method explicitly, you need to create a thread object and call start() on it which should invoke your run() method in the appropriate thread:

thread2 thread;
thread.start()
...

Solution 2

A simple Thread Class that allows you to pass a pointer to a function is as follows:

typedef struct TThread_tag{
int (*funct)(int, void*);
char* Name;
int Flags;
}TThread;

 class Thread : public QThread {
 public:
   TThread ThreadInfoParm;
   void setFunction(TThread* ThreadInfoIn) 
   {
      ThreadInfoParm.funct = ThreadInfoIn->funct;   
   }
 protected:
    void run() 
    {
      ThreadInfoParm.funct(0, 0);   
     }
    };

 TThread* ThreadInfo = (TThread*)Parameter;
 //Create the thread objedt
 Thread* thread = new Thread;
 thread->setFunction(ThreadInfo);//Set the thread info
 thread->start();  //start the thread