Delphi判断某个类是否实现了某个接口
2021-02-01 21:15
标签:contain 偏移量 ber ati hang syntax value xxx integer 通过TObject.GetInterface可以获得对象的实例实现某个接口,前提条件是必须实例化对象后才能运行GetInterface 下面的方法可获取类是否实现了某个接口,并返回接口的偏移: 下面我们看下通过偏移量的快速获得对象的接口,以及通过接口快速获取对象: 快速获取对象的接口: 快速通过接口获取对象 https://www.cnblogs.com/hezihang/p/5735897.html Delphi判断某个类是否实现了某个接口 标签:contain 偏移量 ber ati hang syntax value xxx integer 原文地址:https://www.cnblogs.com/findumars/p/11579250.html
function
FindInterface(AClass: TClass; GUID:TGUID;
var
Offset:NativeInt):
Boolean
;
var
i :
integer
;
InterfaceTable: PInterfaceTable;
InterfaceEntry: PInterfaceEntry;
begin
while
Assigned(AClass)
do
begin
InterfaceTable := AClass
.
GetInterfaceTable;
if
Assigned(InterfaceTable)
then
begin
for
i :=
0
to
InterfaceTable
.
EntryCount-
1
do
begin
InterfaceEntry := @InterfaceTable
.
Entries[i];
if
InterfaceEntry
.
IID=GUID
then
begin
Offset:=InterfaceEntry
.
IOffset;
Exit(
True
);
end
;
end
;
end
;
AClass := AClass
.
ClassParent;
end
;
end
;
type
TSomeObject=
class
(TXXX, ISomeInterface)
......
end
;
var
FItemObjectOffset:NativeInt;
//获取偏移量
FindInterface(TSomeObject, ISomeInterface, FItemObjectOffset)
var
P:TSomeObject;
Intf:ISomeInterface;
....................................
//通过对象直接获取接口
PNativeInt(@Intf)^:=PNativeInt(@P)^+ FItemObjectOffset;
Intf
.
_AddRef;
type
TSomeObject=
class
(TXXX, ISomeInterface)
......
end
;
var
FItemObjectOffset:NativeInt;
//获取偏移量
FindInterface(TSomeObject, ISomeInterface, FItemObjectOffset)
var
P:TSomeObject;
Intf:ISomeInterface;
....................................
//通过接口获取对象
P:=TSomeObject(
Pointer
(PNativeInt(@Intf)^- FItemObjectOffset));
文章标题:Delphi判断某个类是否实现了某个接口
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