engine.cpp

《SymbianOSC手机应用开发》源码

// engine.cpp
//
// Copyright (c) 2000 Symbian Ltd.  All rights reserved.

#include "engine.h"

// construct/destruct

CGameEngine::~CGameEngine()
	{
	delete iLastSent;
	delete iLastReceived;
	}

_LIT(KNullString,"");

const TDesC& CGameEngine::LastSent() const
	{
	if (iLastSent)
		return *iLastSent;
	else
		return KNullString;
	}

const TDesC& CGameEngine::LastReceived() const
	{
	if (iLastReceived)
		return *iLastReceived;
	else
		return KNullString;
	}

// set

void CGameEngine::SetLastSentL(const TDesC& aString)
	{
	delete iLastSent;
	iLastSent=0;
	iLastSent=aString.AllocL();
	}

void CGameEngine::SetLastReceivedL(const TDesC& aString)
	{
	delete iLastReceived;
	iLastReceived=0;
	iLastReceived=aString.AllocL();
	}

void CGameEngine::Reset() // resets everything
	{
	// reset message logs
	delete iLastSent;
	iLastSent=0;
	delete iLastReceived;
	iLastReceived=0;
	}

// persistence

void CGameEngine::ExternalizeL(RWriteStream& aStream) const
	{
	// last sent
	if (iLastSent)
		aStream << *iLastSent;
	else aStream << KNullDesC;
	// last received
	if (iLastReceived)
		aStream << *iLastReceived;
	else aStream << KNullDesC;
	}

void CGameEngine::InternalizeL(RReadStream& aStream)
	{
	Reset();
	HBufC* string;
	// last sent
	string=HBufC::NewL(aStream, 10000);
	if (string->Length() > 0)
		iLastSent=string;
	else
		{
		delete string;
		iLastSent=0;
		}
	// last received
	string=HBufC::NewL(aStream, 10000);
	if (string->Length() > 0)
		iLastReceived=string;
	else
		{
		delete string;
		iLastReceived=0;
		}
	}

TStreamId CGameEngine::StoreL(CStreamStore& aStore) const
	{
	RStoreWriteStream stream;
	TStreamId id = stream.CreateLC(aStore);
	ExternalizeL(stream);
	stream.CommitL();
	CleanupStack::PopAndDestroy(); // stream
	return id;
	}

void CGameEngine::RestoreL(const CStreamStore& aStore, TStreamId aStreamId)
	{
	RStoreReadStream stream;
	stream.OpenLC(aStore,aStreamId);
	InternalizeL(stream);
	CleanupStack::PopAndDestroy(); // stream
	}