create a Class inherits from two QObject subclasses

[jpn]

So most likely mThread is an uninitialized pointer which points to 0xcdcdcdd1. Don't you think you should have

mThread = new QThread(this);

mThread = new QThread(this);

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somewhere?

[sabeesh]

Hi
When I give the command in my constructor

mThread = new QThread(this);

mThread = new QThread(this);

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then Qt return an error like this

.\Test.cpp(70) : error C2259: 'QThread' : cannot instantiate abstract class
due to following members:
'void QThread::run(void)' : is abstract
c:\qt\4.3.0\include\qtcore\qthread.h(87) : see declaration of 'QThread::run'

[jpn]

Ahh, indeed. QThread will be non-abstract in Qt 4.4 but until that you will have to implement QThread::run().

[sabeesh]

Hi,
In my code I had implement the run(). Please see the code , which one i previous declare.

in .h file

virtual void run();

virtual void run();

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and in .cpp file

void CTest::run() {
  .....
  .....
 }

void CTest::run() {
  .....
  .....
 }

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is it correct?

[jpn]

A friendly advise would be to learn C++ before trying to use a comprehensive toolkit written in C++. Using Qt sure requires some knowledge of C++.

What you have shown above declares a method "virtual void run()" in a class which has QThread pointer as a member. That's not at all same than implementing QThread::run().

Notice the difference between:

class Foo : public QObject
{
protected:
  virtual void run() { ... }
 
  QThread* mThread;
};

class Foo : public QObject
{
protected:
  virtual void run() { ... }
  
  QThread* mThread;
};

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and

class MyThread : public QThread
{
protected:
  virtual void run() { ... }
};
 
class Bar : public QObject
{
protected:
  MyThread* mThread;
};

class MyThread : public QThread
{
protected:
  virtual void run() { ... }
};

class Bar : public QObject
{
protected:
  MyThread* mThread;
};

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[sabeesh]

Hi,
Its my mistake. Sorry.

I create a class like this

class MyThread : public QThread
{
 
  protected:
	  virtual void run(){
		  while(true){
		  qDebug()<<"Run";
                   } 
	  }
 
};

class MyThread : public QThread
{

  protected:
	  virtual void run(){
		  while(true){
		  qDebug()<<"Run";
                   } 
	  }

};

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and in .h file

QThread *mThread;

QThread *mThread;

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and give the command in my constructor like this

mThread = new QThread(this);

mThread = new QThread(this);

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but the error is like this

.\Test.cpp(70) : error C2259: 'QThread' : cannot instantiate abstract class
        due to following members:
        'void QThread::run(void)' : is abstract
        c:\qt\4.3.0\include\qtcore\qthread.h(87) : see declaration of 'QThread::run'

.\Test.cpp(70) : error C2259: 'QThread' : cannot instantiate abstract class
        due to following members:
        'void QThread::run(void)' : is abstract
        c:\qt\4.3.0\include\qtcore\qthread.h(87) : see declaration of 'QThread::run'

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Please help me

[marcel]

QThread is abstract. You must instantiate your QThread subclass:

mThread = new MyThread(this);

mThread = new MyThread(this);

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[sabeesh]

Hi,
Ohhhh, It's my mistake. Sorry.
Thankyou for your help