可以将接口的方法作为参数传递吗？
@H_502_28@解决方法
我正在尝试这样的事情：
interface
type
TMoveProc = procedure of object;
// also tested with TMoveProc = procedure;
// procedure of interface is not working ;)
ISomeInterface = interface
procedure Pred;
procedure Next;
end;
TSomeObject = class(TObject)
public
procedure Move(MoveProc: TMoveProc);
end;
implementation
procedure TSomeObject.Move(MoveProc: TMoveProc);
begin
while True do
begin
// Some common code that works for both procedures
MoveProc;
// More code...
end;
end;
procedure Usage;
var
o: TSomeObject;
i: ISomeInterface;
begin
o := TSomeObject.Create;
i := GetSomeInterface;
o.Move(i.Next);
// somewhere else: o.Move(i.Prev);
// tested with o.Move(@i.Next),@@... with no luck
o.Free;
end;
但它不工作,因为：
E2010 Incompatible types: ‘TMoveProc’ and ‘procedure,untyped pointer or untyped parameter’
当然,我可以为每个电话做私人方法,但那是丑陋的.有没有更好的方法？
德尔福2006
编辑：
我知道我可以通过整个界面,但是我必须指定哪个功能使用.我不需要两个完全相同的程序与一个不同的呼叫.
我可以使用第二个参数,但也是丑陋的.
type
SomeInterfaceMethod = (siPred,siNext)
procedure Move(SomeInt: ISomeInterface; Direction: SomeInterfaceMethod)
begin
case Direction of:
siPred: SomeInt.Pred;
siNext: SomeInt.Next
end;
end;
感谢所有的帮助和想法.清洁的解决方案(对于我的Delphi 2006)是Diego的访客.现在我使用简单(“丑”)包装(我自己的,同样的解决方案由TOndrej和Aikislave).
但是真正的答案是“没有(直接)方式将接口的方法作为参数传递,而没有某种提供者.
这是在Delphi 20006中工作的另一个解决方案.它类似于@Rafael的想法,但是使用接口：
interface
type
ISomeInterface = interface
//...
end;
IMoveProc = interface
procedure Move;
end;
IMoveProcPred = interface(IMoveProc)
['{4A9A14DD-ED01-4903-B625-67C36692E158}']
end;
IMoveProcNext = interface(IMoveProc)
['{D9FDDFF9-E74E-4F33-9CB7-401C51E7FF1F}']
end;
TSomeObject = class(TObject)
public
procedure Move(MoveProc: IMoveProc);
end;
TImplementation = class(TInterfacedObject,ISomeInterface,IMoveProcNext,IMoveProcPred)
procedure IMoveProcNext.Move = Next;
procedure IMoveProcPred.Move = Pred;
procedure Pred;
procedure Next;
end;
implementation
procedure TSomeObject.Move(MoveProc: IMoveProc);
begin
while True do
begin
// Some common code that works for both procedures
MoveProc.Move;
// More code...
end;
end;
procedure Usage;
var
o: TSomeObject;
i: ISomeInterface;
begin
o := TSomeObject.Create;
i := TImplementation.Create;
o.Move(i as IMoveProcPred);
// somewhere else: o.Move(i as IMoveProcNext);
o.Free;
end;