如果之前提出过问题，请道歉。我有一些组件的定义如下（如果它是错的，请指导我，因为我是初学者）。我正在尝试的是枚举派生组件的所有已发布属性，尤其是子属性。我可以枚举属性的名称，但是，是否可以枚举在程序执行期间我可以访问元素（如在子属性中）的已发布属性？像getfirst / getnext一样逐个返回属性直到最后？
type
TStringArray = array of string;
TGenericColumnDef = class(TPersistent)
private
fColumnName : String;
fColumnNumber : Integer;
fColumnDisplay : string;
fColumnDescription : string;
fColumnDataType : integer;
fColumnEditorType : integer;
// fMyEvent: TNotifyEvent;
protected
public
constructor create(AOwner: TComponent); virtual;
published
property ColumnName : String read fColumnName write fColumnName;
property ColumnNumber : integer read fColumnNumber write fColumnNumber;
//property MyEvent: TNotifyEvent read fMyEvent write fMyEvent;
end;
TGenericAsset = class(Tcomponent) //TPersistent
private
{ Private declarations }
fCiteID : TGenericColumnDef;
fCiteType : TGenericColumnDef;
fTitle : TGenericColumnDef;
fAuthor : TGenericColumnDef;
fPropertyCount : integer;
function GetPropertyCount : integer;
function GetNextPropertyIndex: integer;
property CountProperties : integer read GetPropertyCount;// write fPropertyCount
protected
{ Protected declarations }
FOwner: TObject;
public
{ Public declarations }
constructor Create(AOwner: TComponent); override;
destructor destory ; virtual;
function GetColumnNameByColumnNumber(ColumnNumber : Integer) : String;
function GetColumnNames : TStringArray;
// function GetFirst : TGenericColumnDef;
published
property CiteID : TGenericColumnDef read fCiteID write fCiteID;
property CiteType : TGenericColumnDef read fCiteType write fCiteType;
property Title : TGenericColumnDef read fTitle write fTitle;
property Author : TGenericColumnDef read fAuthor write fAuthor;
//property Nthproperty .........
end;
//derived from TGenericAsset
type
TEditedBook = class(TGenericAsset)
private
protected
public
published
property CiteID : TGenericColumnDef read fCiteID write fCiteID;
property Title : TGenericColumnDef read fTitle write fTitle;
property Author : TGenericColumnDef read fAuthor write fAuthor;
end;
非常感谢任何要点或指南（示例代码）。 提前谢谢。
答案 0 :(得分：4)
虽然它没有具体回答你的问题，但下面的代码（几年前由TeamB的Peter Below博士捐赠给旧的Borland Delphi新闻组）展示了如何使用RTTI克隆另一个组件。它显示了如何获取（和设置）子属性，如其他对象，枚举类型等。它应该足以让你开始。我在代码中留下了Peter的注释，以及在函数下面以一些示例代码的形式使用它的示例。 （我还保留了他的代码格式和一些关键字的奇怪字母大小。：）
// Unfortunately there is no easy way to "clone" a component in a way that
// will also preserve event handlers. It can be done using run-time type
// information and routines form the TypInfo unit, though. Try the following
// routine. It is only superficially tested.
Uses TypInfo;
{-- CloneComponent ----------------------------------------------------}
{: Make a copy of a component.
@Param anObj is the component to copy
@Param cloneChildren if true and anObj is a TWincontrol then all its
child controls will also be copied.
@Param aParent is the parent to use if anObj is a TControl.
@Returns the new object reference. It will have the same owner as anObj
and passes into the responsibility of the caller.
@Precondition anObj <> nil
@Desc The method creates a new object of the same class as anObj and then
uses TypInfo routines to copy all published properties. The logic used
for object properties is similar to what the form loading code uses:
if a property refers to a TComponent the component reference is copied.
If it refers to a TPersistent descendent the Assign method is used
to copy the objects contents. Currently TCollections do not receive
any special treatment, which may be necessary. <BR>
Note: the routine will not copy any objects *owned* by anObj, so it
cannot be used as is to clone a top-level container like a form,
frame, or datamodule. Those can be copied using WriteComponent and
ReadComponent with a TMemoryStream.
}{ Created 12.4.2002 by P. Below
-----------------------------------------------------------------------}
Function CloneComponent( anObj: TComponent;
cloneChildren: Boolean = false;
aParent: TWinControl = nil ): TComponent;
Var
numProps, I : Integer;
props: PPropList;
PropInfo: PPropInfo;
obj, obj2: TObject;
Begin { CloneComponent }
Assert( Assigned( anObj ));
Result := TComponentClass( anObj.ClassType ).Create( anObj.Owner );
Try
numProps := GetPropList(anObj, props );
Try
For I := 0 To numProps - 1 Do Begin
PropInfo := props^[I];
Case PropInfo^.PropType^.Kind Of
tkInteger, tkChar, tkEnumeration, tkSet, tkWChar:
SetOrdProp( Result, propinfo,
GetOrdProp( anObj, propinfo ));
tkFloat:
SetFloatProp( Result, propinfo,
GetFloatProp( anObj, propinfo ));
tkString, tkLString:
If not SameText( propinfo^.name, 'Name' ) Then
SetStrProp( Result, propinfo,
GetStrProp( anObj, propinfo ));
tkWString:
SetWideStrProp( Result, propinfo,
GetWideStrProp( anObj, propinfo ));
tkMethod:
SetMethodProp( Result, propinfo,
GetMethodProp( anObj, propinfo ));
tkInt64:
SetInt64Prop( Result, propinfo,
GetInt64Prop( anObj, propinfo ));
tkVariant:
SetVariantProp( Result, propinfo,
GetVariantProp( anObj, propinfo ));
tkInterface:
SetInterfaceProp( Result, propinfo,
GetInterfaceProp( anObj, propinfo ));
tkClass: Begin
obj := GetObjectProp( anObj, propinfo );
If Assigned( obj ) Then Begin
If obj Is TComponent Then
SetObjectProp( Result, propinfo, obj )
Else If obj Is TPersistent Then Begin
obj2 := GetObjectProp( result, propinfo, TPersistent);
If Assigned( obj2 ) Then
TPersistent( obj2 ).Assign( TPersistent(obj));
End; { If }
End; { If }
End; { Case tkClass }
Else
// we don't handle these property types:
// tkArray, tkRecord, tkDynArray
End; { Case }
End; { For }
Finally
FreeMem( props );
End; { Finally }
If anObj Is TControl Then
TControl( result ).Parent := aParent;
If cloneChildren and (anObj Is TWinControl ) Then
For i:= 0 To TWinControl( anObj ).ControlCount-1 Do
CloneComponent( TWinControl( anObj ).Controls[i], true,
TWinControl( Result ) );
Except
Result.Free;
raise
End; { Except }
End; { CloneComponent }
procedure TForm1.GroupBox1MouseDown(Sender: TObject; Button: TMouseButton;
Shift: TShiftState; X, Y: Integer);
begin
memo1.lines.add('Click on groupbox '+(sender as TComponent).Name );
end;
procedure TForm1.Button1Click(Sender: TObject);
Var
ctrl: TWinControl;
begin
ctrl := CloneComponent( groupbox1, true, self ) as TWincontrol;
With ctrl Do
SetBounds( left, top+height+8, width, height );
memo1.Lines.add( Format('Controlcount: %d', [ctrl.controlcount]));
end;