自学教程：C++ GetLink函数代码示例

// Initialize -- Initialize Block Heap Manager ---------------------CHeapBlock-//// Free Block in heap://		{<sizePrev/sizeNext/signPrev/signNext><<FreeLinks> data >}//// Allocated Block in heap://		{<sizePrev/sizeNext/signPrev/signNext>< data >}//// The Heap is as follows://		<sizePrev=0/sizeOf1st=n/SIGNEND/signOf1st> <data block 1> ...//		... <data block N> <0/sizeOfN/signOfN/SIGNEND>//// All <data> is allocated to fall on the ALIGNSIZE byte boundry.//// pFree -> {1st free block}// pAlloc-> {1st allocated block}//// NOTE:  Block sizes must ALWAYS be valid except in critical regions//ERC CHeapBlock::Initialize(U32 nFragment, U32 aP[], U32 aCb[], U16 sUnit){	sUnit_ = sUnit + (ALIGNSIZE - 1) & ~ALIGNMASK;	sSplit_= sUnit + sizeof(BLKHEAD);	// This code assumes the heap is at least large enough for three headers	// Make block marking beginning of heap	pHeap_ = (BLKHEAD *)( (aP[0] + ALIGNMASK) & ~ALIGNMASK );	pHeap_->sPrev = 0;			// End Block Marker	pHeap_->sThis = 0;	pHeap_->tThis = TYPEEND;	pHeap_->pThis = this;	// Remove 1st header from fragment for loop	aCb[0] = aCb[0] - ((int)(pHeap_+1) - (int)aP[0]);	aP[0] = (U32)(pHeap_+1);	pFree_ = (BLKHEAD*)aP[0];	// 1st free block	// Add fragments to the free list	U32 sPrev = 0;			// First Free Block	BLKHEAD *pPrev = NULL;	for (int iFragment=0; iFragment < nFragment; iFragment++) {		// Enter fragment as a free block		BLKHEAD *pFrag = (BLKHEAD *)( (aP[iFragment] + ALIGNMASK) & ~ALIGNMASK );		// Reduce size of fragment by amount pFrag was rounded up		U32 sThis = aCb[iFragment] - ((int)pFrag - (int)aP[iFragment]);		pFrag->sPrev = sPrev;		pFrag->sThis = sThis - sizeof(BLKHEAD)*2;		pFrag->tThis = TYPEFREE;		pFrag->pThis = this;		// Link this free block on the free list		GetLink(pFrag)->pNextFree = NULL;		GetLink(pFrag)->pPrevFree = pPrev;		if (pPrev)			GetLink(pPrev)->pNextFree = pFrag;		// Enter gap between fragments as 'inuse' block, except last one which is end block		GetNext(pFrag)->sPrev = pFrag->sThis;		if (iFragment+1 < nFragment) {			BLKHEAD *pNext = (BLKHEAD *)( (aP[iFragment+1] + ALIGNMASK) & ~ALIGNMASK );			GetNext(pFrag)->sThis = (int)pNext - (int)(GetNext(pFrag)+1);			GetNext(pFrag)->tThis = TYPEALLOC;		}		else {			GetNext(pFrag)->sThis = 0; // End Block Marker			GetNext(pFrag)->tThis = TYPEEND;		}		GetNext(pFrag)->pThis = this;		pPrev = pFrag;		sPrev = pFrag->sThis;	}	return OK;}

// _Link -- Link block to free list --------------------------------CHeapBlock-//void CHeapBlock::_Link(BLKHEAD *pBlk){	Critical section;	GetLink(pBlk)->pPrevFree = NULL;	GetLink(pBlk)->pNextFree = pFree_;	if (pFree_ != NULL)		GetLink(pFree_)->pPrevFree = pBlk;		pFree_ = pBlk;}

//------------------------------------------------------------------------------bool CUIEdProjectUI::IsParent(CIwAttrInstance* inst,CIwAttrInstance* parent){    CUIEdAttrLinkData* link=GetLink(inst);    CUIEdAttrLinkData* parentLink=GetLink(parent);    if (link==NULL || parentLink==NULL) return false;    for (; parentLink!=NULL; parentLink=parentLink->m_Parent)    {        if (link==parentLink)            return true;    }    return false;}

/*! see CMultiXSession::CheckStatus*/bool	CMultiplexerClientFEClientSession::CheckStatus(){	if(GetLink()	==	NULL)		Kill();	//	by returning true we will disable the deletion of the session based on Idle timer	return	true;}

CMultiXLayer::EventHandlerReturn	CMultiXL3::OnAcceptCompleted(CMultiXEvent	&Event){	CMultiXL2Event	*Ev	=	(CMultiXL2Event	*)&Event;	CMultiXL3Link	*Link	=	GetLink(Ev->L2LinkID());	if(Link	==	NULL)	{		CMultiXL2CloseReq	L2Req(this,LowerLayer());		L2Req.m_L2LinkID		=	Ev->NewL2LinkID();		LowerLayer()->RequestHandler(L2Req);	}	else	{		if(Ev->IoError())		{			CMultiXL2CloseReq	L2Req(this,LowerLayer());			L2Req.m_L2LinkID		=	Link->m_L2LinkID;			LowerLayer()->RequestHandler(L2Req);		}	else		{			CMultiXL3Link	*NewLink	=	CreateLink(Ev->NewL2LinkID());			NewLink->OnAcceptCompleted(*Link);		}	}	return	CMultiXLayer::DeleteEvent;}

void wxHtmlCell::OnMouseClick(wxWindow *, int, int, const wxMouseEvent& event){    wxCHECK_RET( gs_helperOnMouseClick, wxT("unexpected call to OnMouseClick") );    wxHtmlWindowInterface *window = gs_helperOnMouseClick->window;    const wxPoint& pos = gs_helperOnMouseClick->pos;#endif // WXWIN_COMPATIBILITY_2_6    wxHtmlLinkInfo *lnk = GetLink(pos.x, pos.y);    bool retval = false;    if (lnk)    {        wxHtmlLinkInfo lnk2(*lnk);        lnk2.SetEvent(&event);        lnk2.SetHtmlCell(this);        window->OnHTMLLinkClicked(lnk2);        retval = true;    }#if WXWIN_COMPATIBILITY_2_6    gs_helperOnMouseClick->retval = retval;#else    return retval;#endif // WXWIN_COMPATIBILITY_2_6}

/*!	see CMultiXSession::OnSendMsgFailed	We notify the associated link that the last message received from the POS terminal	was not processed succefuly by the server application.*/void	CMultiplexerClientFEClientSession::OnSendMsgFailed(CMultiXAppMsg &OriginalMsg){	DebugPrint(2,"Send Msg Failed/n");		CMultiplexerClientFELink	*pLink	=	GetLink();	if(pLink)		pLink->OnSessionSendFailed(OriginalMsg,ErrUnableToForwardMsg);	}

int Track::GetMinimizedHeight() const{   if (GetLink()) {      return 20;   }   return 40;}

NS_IMETHODIMPHTMLBodyElement::GetLink(nsAString& aLink){  nsString link;  GetLink(link);  aLink = link;  return NS_OK;}

NS_IMETHODIMPHTMLBodyElement::GetLink(nsAString& aLink){  DOMString link;  GetLink(link);  link.ToString(aLink);  return NS_OK;}

voidCMLineAddressTable::SetExecutionPoint	(	const JIndex lineIndex	){	const JString addr = BuildAddress(*(itsLineTextList->GetElement(lineIndex)));	GetLink()->SetExecutionPoint(addr);}

TBool CMccControllerStub::StreamsExists( TUint32 aSessionId,                                          TUint32 aLinkId )    {    TLink link;    link.iSessionID = aSessionId;    link.iLinkID = aLinkId;            return iStreamExists == -1 ? GetLink( link ).iStreams > 0 : iStreamExists == 1;    }

Image RichTextView::CursorImage(Point p, dword keyflags){	int pos = GetPointPos(p);	if(WhenLink && pos >= 0 && !IsNull(GetLink(pos, p)))		return CtrlImg::HandCursor();	if(HasCapture())		return CtrlImg::ibeam0();	return Image::Arrow();}

void USmartNavLinkComponent::OnApplyModifiers(FCompositeNavModifier& Modifiers){	FNavigationLink LinkMod = GetLink();	Modifiers.Add(FSimpleLinkNavModifier(LinkMod, GetOwner()->GetTransform()));	if (bCreateBoxObstacle)	{		Modifiers.Add(FAreaNavModifier(FBox::BuildAABB(ObstacleOffset, ObstacleExtent), GetOwner()->GetTransform(), ObstacleAreaClass));	}}

// _LockNext// // Unlock block then mark next block and return -> next block.  If next// block is corrupted then returns NULL.  If next block is END then unlock// this block and return NULL.BLKHEAD * CHeapBlock::_LockNext(BLKHEAD *pBlk){//	Critical section;	// Skip locked free blocks	for(pBlk = GetLink(pBlk)->pNextFree ; pBlk != NULL; pBlk = GetLink(pBlk)->pNextFree) {		if (pBlk->tThis == TYPEFREE) {//			pBlk->tThis = TYPELOCK;			break;		}//		if (pBlk->tThis != TYPELOCK) {		else {			pBlk = NULL;	//*** CORRUPTED HEAP ***			break;		}	}		return pBlk;}

wxCursor wxHtmlWordCell::GetMouseCursor(wxHtmlWindowInterface *window) const{    if ( !GetLink() )    {        return window->GetHTMLCursor(wxHtmlWindowInterface::HTMLCursor_Text);    }    else    {        return wxHtmlCell::GetMouseCursor(window);    }}

wxCursor wxHtmlCell::GetCursor() const{    if ( GetLink() )    {        if ( !gs_cursorLink )            gs_cursorLink = new wxCursor(wxCURSOR_HAND);        return *gs_cursorLink;    }    else        return *wxSTANDARD_CURSOR;}

//------------------------------------------------------------------------------void CUIEdProjectUI::CopyLayoutChildren(CUIEdAttrLinkData* parent,CUIEdAttrLinkData* old,int actionModifer){    for (int i=0; i<(int)old->m_Children.size(); i++)    {        CIwAttrInstance* inst=Add(old->m_Children[i]->m_Element,parent->m_Element,ACTIONMODIFIER_KEEPNAME);        CUIEdAttrLinkData* link2=GetLink(inst);        if (link2!=NULL)            SetName(link2);    }}