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By Mike Orriss

Книга Delphi FAQ Delphi FAQ Книги Delphi0 (голосов: zero) Оценка:Этот документ составлен по материалам форумов программистовФормат: chmРазмер: 2.7 MB

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Php Áûñòðûé ñïîñîá îáìåíà çíà÷åíèé â 2õ ïåðåìåííûõ. php Êàê ïðî÷èòàòü çíà÷åíèå ñâîéñòâà êîìïîíåíòà ïî èìåíè? Previous Top Next You may need to know at runtime what properties are available for a particular component at runtime. The list can be obtained by a call to GetPropList. PAS. GetPropList Parameters function GetPropList(TypeInfo: PTypeInfo; TypeKinds: TTypeKinds; PropList: PPropList): Integer; The first parameter for GetPropList is of type PTypeInfo, and is part of the RTTI (Run Time Type Information) available for any object.

TCollection è TCollectionItem. Êîãäà Âû îáúÿâëÿåòå íîâîãî ïîòîìêà TCollectionItem , òî òàê æå Âû íàñëåäóåòå íîâûé êëàññ îò TOwnedCollection è ïåðåîïðåäåëÿåòå áîëüøèíñòâî ìåòîäîâ, ÷òîáû èõ ìîæíî áûëî âûçûâàòü ñ íîâûìè òèïàìè. pas: _COLLECTION_ = class (TOwnedCollection) protected function GetItem (const aIndex : Integer) : _COLLECTION_ITEM_; procedure SetItem (const aIndex : Integer; const aValue : _COLLECTION_ITEM_); public constructor Create (const aOwner : TComponent); function Add : _COLLECTION_ITEM_; function FindItemID (const aID : Integer) : _COLLECTION_ITEM_; function Insert (const aIndex : Integer) : _COLLECTION_ITEM_; property Items [const aIndex : Integer] : _COLLECTION_ITEM_ read GetItem write SetItem; end; Îáðàòèòå âíèìàíèå, ÷òî íåò íèêàêèõ uses èëè interface clauses, òîëüêî óíèâåðñàëüíîå îáúÿâëåíèå 31 32 òèïà, â êîòîðîì _COLLECTION_ ýòî èìÿ óíèâåðñàëüíîé êîëëåêöèè êëàññà, à _COLLECTION_ITEM_ ýòî èìÿ ìåòîäîâ, ñîäåðæàùèõñÿ â íàøåì øàáëîíå.

Traditionally, this was used to represent unsigned integers, but Object Pascal does not have a true unsigned integer data type. PULONG ^ULONG; Pointer to 32-bit whole numbers PLongint ^Longint; Pointer to 32-bit values PInteger ^Integer; Pointer to 32-bit values PSmallInt ^Smallint; Pointer to 16-bit values PDouble ^Double; Pointer to double (floating point) values LCID DWORD; A local identifier 38 Previous Top Next 39 LANGID Word; A language identifier THandle Integer; An object handle. Many Windows API functions return a value of type THandle, which identobject ifies that object within Windows'internal object tracking tables.

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