自学教程：C++ CheckValid函数代码示例

void dlgRule::CheckChange(){    if (rule)    {        EnableOK(didChange() || txtSqlBox->GetText() != oldDefinition || txtComment->GetValue() != rule->GetComment());    }    else    {        wxString name = GetName();        bool enable = true;        CheckValid(enable, !name.IsEmpty(), _("Please specify name."));        CheckValid(enable, rbxEvent->GetSelection() >= 0,                   _("Please select at an event."));        CheckValid(enable, !txtSqlBox->GetTextLength() || txtSqlBox->GetTextLength() > 6 , _("Please enter function definition."));        EnableOK(enable);    }}

void nuiSprite::DelMatrixNode(uint32 index){  if (!mpMatrixNodes)    return;    CheckValid();  mpMatrixNodes->at(index)->Release();  mpMatrixNodes->erase(mpMatrixNodes->begin() + index);    DebugRefreshInfo();}

///// Creates a bitmap object with the values found in the given bitmap structure./// This overload is deprecated. Use the overload that takes a reference instead.//TBitmap::TBitmap(const BITMAP * bitmap){  PRECONDITION(bitmap);  Handle = ::CreateBitmapIndirect((LPBITMAP)bitmap);  // API cast  WARNX(OwlGDI, !Handle, 0, "Cannot create bitmap from BITMAP @" <<        hex << (void*)bitmap);  CheckValid();  RefAdd(Handle, Bitmap);  TRACEX(OwlGDI, OWL_CDLEVEL, "TBitmap constructed @" << (void*)this << " from BITMAP @" <<         (void*)bitmap << ".");}

	void CBundle::ForceUngetService(CServiceRegistration* service)	{		THREAD_ANY();		VERBOSE("WARNING [%s] Stale service reference", m_location.c_str());		/// /todo verify		CheckValid();		TServicesInUseContainer::iterator it = m_servicesInUse.find(service);		ASSERT_STRICT(it != m_servicesInUse.end());		it->second.Reset();	}

bool cByteBuffer::SkipRead(int a_Count){	CHECK_THREAD;	CheckValid();	ASSERT(a_Count >= 0);	if (!CanReadBytes(a_Count))	{		return false;	}	AdvanceReadPos(a_Count);	return true;}

void dlgTablespace::CheckChange(){	bool enable = true;	if (tablespace)	{		enable = txtComment->GetValue() != tablespace->GetComment()		         || GetName() != tablespace->GetName()		         || cbOwner->GetValue() != tablespace->GetOwner()		         || dirtyVars;		if (seclabelPage && connection->BackendMinimumVersion(9, 2))			enable = enable || !(seclabelPage->GetSqlForSecLabels().IsEmpty());	}	else	{		wxString name = GetName();		CheckValid(enable, !GetName().IsEmpty(), _("Please specify name."));		CheckValid(enable, !txtLocation->GetValue().IsEmpty(), _("Please specify location."));	}	EnableOK(enable);}

void dlgTextSearchParser::CheckChange(){	if (parser)	{		EnableOK(txtName->GetValue() != parser->GetName()		         || cbSchema->GetValue() != parser->GetSchema()->GetName()		         || txtComment->GetValue() != parser->GetComment());	}	else	{		wxString name = GetName();		bool enable = true;		CheckValid(enable, !name.IsEmpty(), _("Please specify name."));		CheckValid(enable, cbStart->GetValue().Length() > 0 , _("Please select a start function."));		CheckValid(enable, cbGetToken->GetValue().Length() > 0 , _("Please select a gettoken function."));		CheckValid(enable, cbEnd->GetValue().Length() > 0 , _("Please select an end function."));		CheckValid(enable, cbLextypes->GetValue().Length() > 0 , _("Please select a lextypes function."));		EnableOK(enable);	}}

void dlgLanguage::CheckChange(){	bool enable = true;	wxString name = cbName->GetValue();	if (language)	{		enable = name != language->GetName()		         || txtComment->GetValue() != language->GetComment()		         || (connection->BackendMinimumVersion(8, 3) && cbOwner->GetValue() != language->GetOwner());		if (seclabelPage && connection->BackendMinimumVersion(9, 1))			enable = enable || !(seclabelPage->GetSqlForSecLabels().IsEmpty());	}	else	{		bool useTemplate = (cbName->FindString(name) >= 0);		CheckValid(enable, !name.IsEmpty(), _("Please specify name."));		CheckValid(enable, useTemplate || !cbHandler->GetValue().IsEmpty(), _("Please specify language handler."));	}	EnableOK(enable);}

void dlgRepPath::CheckChange(){	if (path)	{		EnableOK(txtConnInfo->GetValue() != path->GetConnInfo()		         ||   StrToLong(txtConnRetry->GetValue()) != path->GetConnRetry());	}	else	{		bool enable = true;		CheckValid(enable, cbServer->GetCount() > 0, _("No provider node without path definition left."));		CheckValid(enable, cbServer->GetCurrentSelection() >= 0, _("Please select provider node."));		wxString connInfo = txtConnInfo->GetValue();		CheckValid(enable, connInfo.Find(wxT("host=")) >= 0, _("Please provide host in connect info."));		CheckValid(enable, connInfo.Find(wxT("dbname=")) >= 0, _("Please provide dbname in connect info."));		CheckValid(enable, connInfo.Find(wxT("user=")) >= 0, _("Please provide user in connect info."));		EnableOK(enable);	}}

void dlgRepCluster::CheckChange(){	if (cluster)	{		int sel = cbAdminNode->GetCurrentSelection();		bool changed = (sel >= 0 && (long)cbAdminNode->wxEvtHandler::GetClientData() != cluster->GetAdminNodeID());		EnableOK(changed || txtComment->GetValue() != cluster->GetComment());	}	else	{		size_t i;		bool enable = true;		CheckValid(enable, chkJoinCluster->GetValue() || (!createScript.IsEmpty()),		           _("Slony-I creation scripts not available; only joining possible."));		if (chkJoinCluster->GetValue())			CheckValid(enable, !cbClusterName->GetValue().IsEmpty(), _("Please select a cluster name."));		else			CheckValid(enable, !txtClusterName->GetValue().IsEmpty(), _("Please specify name."));		long nodeId = StrToLong(txtNodeID->GetValue());		CheckValid(enable, nodeId > 0, _("Please specify local node ID."));		for (i = 0 ; i < usedNodes.GetCount() && enable; i++)			CheckValid(enable, nodeId != usedNodes[i], _("Node ID is already in use."));		CheckValid(enable, !txtNodeName->GetValue().IsEmpty(), _("Please specify local node name."));		txtAdminNodeName->Enable(nodeId != StrToLong(txtAdminNodeID->GetValue()));		EnableOK(enable);	}}

///// Constructs a cursor object from the specified resource ID.//TCursor::TCursor(HINSTANCE instance, TResId resId){  PRECONDITION(resId);  Handle = ::LoadCursor(instance, resId);  if(!Handle && instance != GetGlobalModule().GetHandle()){ // default load from OWL DLL    Handle = GetGlobalModule().LoadCursor(resId);    instance = GetGlobalModule().GetHandle();  }  ShouldDelete = (instance != 0);  CheckValid();  TRACEX(OwlGDI, OWL_CDLEVEL, "TCursor @" << (void*)this <<    " loaded from resource " << resId);}

void dlgForeignTable::CheckChange(){	bool enable = true;	if (foreigntable)	{		enable = txtComment->GetValue() != foreigntable->GetComment()		         || cbSchema->GetValue() != foreigntable->GetSchema()->GetName()		         || cbOwner->GetValue() != foreigntable->GetOwner()		         || GetSqlForTypes() != wxEmptyString		         || GetSql().Length() > 0;		if (seclabelPage && connection->BackendMinimumVersion(9, 1))			enable = enable || !(seclabelPage->GetSqlForSecLabels().IsEmpty());	}	else	{		wxString name = GetName();		CheckValid(enable, !name.IsEmpty(), _("Please specify name."));		CheckValid(enable, cbForeignServer->GetCurrentSelection() >= 0, _("Please specify a foreign server."));	}	EnableOK(enable);}

void dlgSchedule::CheckChange(){	timEnd->Enable(calEnd->GetValue().IsValid());	wxString name = GetName();	bool enable = true;	if (statusBar)		statusBar->SetStatusText(wxEmptyString);	InitSelectAll();	CheckValid(enable, !name.IsEmpty(), _("Please specify name."));	CheckValid(enable, calStart->GetValue().IsValid(), _("Please specify start date."));	if (enable)	{		EnableOK(!GetSql().IsEmpty());	}	else		EnableOK(false);}

void dlgView::CheckChange(){    bool enable = true;    wxString name = GetName();    CheckValid(enable, !name.IsEmpty(), _("Please specify name."));    CheckValid(enable, txtSqlBox->GetText().Trim(true).Trim(false).Length() > 0 , _("Please enter function definition."));    if(enable)    {        if (view)            enable = txtComment->GetValue() != view->GetComment()                     || txtSqlBox->GetText().Trim(true).Trim(false) != oldDefinition.Trim(true).Trim(false)                     || cbOwner->GetValue() != view->GetOwner()                     || cbSchema->GetValue() != view->GetSchema()->GetName()                     || name != view->GetName();        if (seclabelPage && connection->BackendMinimumVersion(9, 1))            enable = enable || !(seclabelPage->GetSqlForSecLabels().IsEmpty());        if (connection->BackendMinimumVersion(9, 2))        {            if (view)            {                if (chkSecurityBarrier->GetValue())                    enable = enable || !(view->GetSecurityBarrier() == wxT("true"));                else                    enable = enable || (view->GetSecurityBarrier() == wxT("true"));            }            else            {                enable = enable || (chkSecurityBarrier->GetValue());            }        }    }    EnableOK(enable);}

static int SetupNbLines(HEX_DUMP *hex_dump, int h){  int htline, h_result ;  htline                       = hex_dump->h_char + hex_dump->interline ;  hex_dump->nb_lines_on_window = h / htline ;  if ( hex_dump->nb_lines_on_window > hex_dump->total_nb_lines )    hex_dump->nb_lines_on_window = hex_dump->total_nb_lines ;  h_result = (int) (hex_dump->nb_lines_on_window * htline) ;  CheckValid( hex_dump ) ;  return( h_result ) ;}

CQuickBuildString& CQuickBuildString::operator=(char c){	m_iLength = 1;	realloc(iBlockSize); // Use iBlocksize instead of 2 as this will, in all probability, grow		((int*)(m_szContent))[0] = c;	// Above is Quick assignment cheat assigns word instead of this:	//m_szContent[0] = c;	//m_szContent[1] = 0;	CheckValid();	return *this;}

void dlgSynonym::CheckChange(){	bool enable = true;	CheckValid(enable, !txtName->GetValue().IsEmpty(), _("Please specify name."));	CheckValid(enable, !cbTargetType->GetValue().IsEmpty(), _("Please select target type."));	// Public Synonyms does supported in public only	if (!synonymSchema && cbTargetType->GetValue() != _("Public synonym"))		CheckValid(enable, !cbTargetSchema->GetValue().IsEmpty(), _("Please select target schema."));	CheckValid(enable, !cbTargetObject->GetValue().IsEmpty(), _("Please select target object."));	if (!enable)	{		EnableOK(enable);		return;	}	if (synonym)		EnableOK(synonym->GetTargetObject() != cbTargetObject->GetValue());	else if (privSynonym)		EnableOK(privSynonym->GetTargetObject() != cbTargetObject->GetValue());	else		EnableOK(txtName->GetValue() != wxEmptyString && cbTargetObject->GetValue() != wxEmptyString);}