QHash only getting updated not populated

[quickNitin]

hello everybody
here is sample of code. Problem with it is only latest element read and appended to hash exists. previous donot.

struct dataStruct
{
	int id[15];
	int x[15], y[15];
};
//mData is of type dataStruct a data member of MyThread
void MyThread::run()
{
	int count,timesOfRead=0,i=0;	
	int fd0 = open("/home/prince/mydev01",O_RDWR|O_NONBLOCK);
	if(fd0== -1)
		cout<<"\n------------------- No fifo found///////---------------------\n\n";
	else
		cout<<" Fifo found \n";   
 
	// iterator for iterating over hash
	QHashIterator<int, QList<float> *> itr(hash);
    	bool mthFlag=false;// this is here to check whether itr fond element or not
	QList<float> * tempList;
	while( ! _end ) 
	{
 
	 while((count=read(fd0 ,&mData,sizeof(struct dataStruct))!=-1))	
	{	
		cout<<"\n no of bytes read"<<count<<"\t"<< count/sizeof(struct dataStruct);
 
	 for(i=0;i<15;i++)//for loop1- for each id of structure
	 {itr.toFront();
	  while(itr.hasNext())
	  { 
		itr.next();
		if(itr.key()==mData.id[i]) // if id exist add it to the list
		{
			itr.value()->append(mData.x[i]);
			itr.value()->append(mData.y[i]);
			mthFlag=true; // id found
			break;//no need to iterate remaining has
		}
 
	  }
 
	  if(mthFlag!=true)
	  {
		tempList=new QList<float>;
		tempList->append(mData.x[i]);
		tempList->append(mData.y[i]);
		hash.insert(mData.id[i],tempList);// hash is data member of MyThread class
 
	  }
		mthFlag=false;
	 }//for-loop1	
 
	itr.toFront();
	while ( itr.hasNext())
	{	itr.next();
 
		QListIterator<float> tempListItr(*itr.value());
		tempListItr.toBack();
		while(tempListItr.hasPrevious())
			cout<<" "<<tempListItr.previous();
		cout<<"\t";
	}
 
 
	 itr.toFront();
	 emit dataAvailable();
	 _semaphore.acquire();
	}}
	close(fd0); 
	emit stopThreadSignal();
	cout<<"\tdataAvailable called";
 
}

struct dataStruct
{
	int id[15];
	int x[15], y[15];
};
//mData is of type dataStruct a data member of MyThread
void MyThread::run()
{
	int count,timesOfRead=0,i=0;	
	int fd0 = open("/home/prince/mydev01",O_RDWR|O_NONBLOCK);
	if(fd0== -1)
		cout<<"\n------------------- No fifo found///////---------------------\n\n";
	else
		cout<<" Fifo found \n";   
	
	// iterator for iterating over hash
	QHashIterator<int, QList<float> *> itr(hash);
    	bool mthFlag=false;// this is here to check whether itr fond element or not
	QList<float> * tempList;
	while( ! _end ) 
	{
		
	 while((count=read(fd0 ,&mData,sizeof(struct dataStruct))!=-1))	
	{	
		cout<<"\n no of bytes read"<<count<<"\t"<< count/sizeof(struct dataStruct);
		
	 for(i=0;i<15;i++)//for loop1- for each id of structure
	 {itr.toFront();
	  while(itr.hasNext())
	  { 
		itr.next();
		if(itr.key()==mData.id[i]) // if id exist add it to the list
		{
			itr.value()->append(mData.x[i]);
			itr.value()->append(mData.y[i]);
			mthFlag=true; // id found
			break;//no need to iterate remaining has
		}

	  }
	
	  if(mthFlag!=true)
	  {
		tempList=new QList<float>;
		tempList->append(mData.x[i]);
		tempList->append(mData.y[i]);
		hash.insert(mData.id[i],tempList);// hash is data member of MyThread class
		
	  }
		mthFlag=false;
	 }//for-loop1	
	
	itr.toFront();
	while ( itr.hasNext())
	{	itr.next();
			
		QListIterator<float> tempListItr(*itr.value());
		tempListItr.toBack();
		while(tempListItr.hasPrevious())
			cout<<" "<<tempListItr.previous();
		cout<<"\t";
	}
	
	
	 itr.toFront();
	 emit dataAvailable();
	 _semaphore.acquire();
	}}
	close(fd0); 
	emit stopThreadSignal();
	cout<<"\tdataAvailable called";
	
}

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