calculatesum.cpp

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/*
 ============================================================================
 Name		: CalculateSum.cpp
 Author	  : hou maoqing
 Version	 : 1.0
 Copyright   : Copyright (c) Hou maoqing 2008
 Description : CCalculateSum implementation
 ============================================================================
 */

#include "CalculateSum.h"
#include "ActiveObjectExam.h"
#include <e32cons.h>

CCalculateSum::CCalculateSum() :
	CActive(EPriorityStandard) // Standard priority
	{
	}

CCalculateSum* CCalculateSum::NewLC()
	{
	CCalculateSum* self = new ( ELeave ) CCalculateSum();
	CleanupStack::PushL(self);
	self->ConstructL();
	return self;
	}

CCalculateSum* CCalculateSum::NewL()
	{
	CCalculateSum* self = CCalculateSum::NewLC();
	CleanupStack::Pop(); // self;
	return self;
	}

void CCalculateSum::ConstructL()
	{
	User::LeaveIfError(iTimer.CreateLocal() ); // Initialize timer
	CActiveScheduler::Add( this); // Add to scheduler
	}

CCalculateSum::~CCalculateSum()
	{
	Cancel(); // Cancel any request, if outstanding
	iTimer.Close(); // Destroy the RTimer object
	// Delete instance variables if any
	}

void CCalculateSum::DoCancel()
	{
	iTimer.Cancel();
	}

void CCalculateSum::StartL(TTimeIntervalMicroSeconds32 aDelay)
	{
	Cancel(); // Cancel any request, just to be sure
	iState = EUninitialized;
	iTimer.After(iStatus, aDelay); // Set for later
	SetActive(); // Tell scheduler a request is active
	}

void CCalculateSum::StartCalculate()
	{
	m_nStep=1000;
	m_nLastInt=0;
	m_nSum=0; 
	
	Cancel();
	CalculateNext();
	}
	
void CCalculateSum::CalculateNext()
	{
	for(TInt i=0;i<m_nStep;i++)
		{
		m_nLastInt++;
		if(m_nLastInt>10000)
			{
			CalculateFinished();
			return;
			}
		
		m_nSum+=m_nLastInt;
		}
	
	//延时一会后，接着计算
	iTimer.After(iStatus, 30*1000); // Set for 30ms later
	SetActive(); // Tell scheduler a request is active
	}

void CCalculateSum::CalculateFinished()
	{
	TBuf<40> bufSum;
	bufSum.AppendFormat(_L("By AO, Sum=%d\n"),m_nSum);
	GetConsole()->Write(bufSum);
	}


void CCalculateSum::RunL()
	{
	CalculateNext();
	}

TInt CCalculateSum::RunError(TInt aError)
	{
	return aError;
	}