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Как получить значение property по его имени

12:41
unit Unit1;
 
interface
 
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls, TypInfo;
 
type
TForm1 = class(TForm)
Label1: TLabel;
Button1: TButton;
procedure Button1Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;
 
var
Form1: TForm1;
 
implementation
 
{$R *.dfm}
 
function GetPropVal(Persistor: tPersistent;
PropName: string): string;
var
i: integer;
propInfo: pPropInfo;
Kinds: TTypeKinds;
ClassProp: tObject;
begin
Result := '';
propinfo := getPropInfo(persistor, PropName, []);
case propinfo^.proptype^.Kind of
tkInteger:
Result := intToStr(GetOrdProp(Persistor, PropInfo));
tkChar:
Result := char(GetOrdProp(Persistor, PropInfo));
tkEnumeration:
if PropInfo^.PropType^ = TypeInfo(boolean) then
Result := GetEnumProp(Persistor, PropInfo)
else
Result := GetEnumProp(Persistor, PropInfo);
tkFloat:
if PropInfo^.PropType^ = TypeInfo(TDateTime) then
Result := DateTimeToStr(GetFloatProp(Persistor, PropInfo))
else
if PropInfo^.PropType^ = TypeInfo(TTime) then
Result := TimeToStr(GetFloatProp(Persistor, PropInfo))
else
if PropInfo^.PropType^ = TypeInfo(TDate) then
Result := DateToStr(GetFloatProp(Persistor, PropInfo))
else
Result := FloatToStr(GetFloatProp(Persistor, PropInfo));
tkString:
Result := GetStrProp(Persistor, PropInfo);
tkLString:
Result := GetStrProp(Persistor, PropInfo);
tkWString:
Result := GetStrProp(Persistor, PropInfo);
tkSet:
Result := GetSetProp(Persistor, PropInfo);
tkInt64:
Result := intToStr(GetInt64Prop(Persistor, PropInfo));
tkClass:
begin
ClassProp := GetObjectProp(Persistor, PropName);
result := tPersistent(ClassProp).ClassName;
end;
end;
end;
 
procedure TForm1.Button1Click(Sender: TObject);
begin
showmessage(GetPropVal(Label1, 'Caption'));
end;
 
end.