Узнать класс формы

type 
  PFieldClassTable = ^TFieldClassTable; 
  TFieldClassTable = packed record 
    Count: Smallint; 
    Classes: array[0..8191] of ^TPersistentClass; 
  end; 
 
function GetFieldClassTable(AClass: TClass): PFieldClassTable; assembler; 
asm 
        MOV     EAX,[EAX].vmtFieldTable 
        OR      EAX,EAX 
        JE      @@1 
        MOV     EAX,[EAX+2].Integer 
@@1: 
end; 
 
procedure TForm1.Button1Click(Sender: TObject); 
  procedure Display( const S: String ); 
  begin 
    memo1.lines.add( S ); 
  end; 
var 
  pFCT: PFieldClassTable; 
  aClass: TClass; 
  i: SmallInt; 
begin 
  memo1.clear; 
  aClass:= Classtype; 
  While aClass <> TPersistent Do Begin 
    Display('Registered classes for class '+aClass.Classname ); 
    pFCT := GetFieldClasstable( aClass ); 
    If not Assigned( pFCT ) Then 
      Display('  No classes registered') 
    Else Begin 
      Display( format('  %d classes registered', [pFCT^.Count])); 
      for i:= 0 to pFCT^.Count -1 do 
        Display( '  '+pFCT^.Classes[i]^.ClassName ); 
    End; 
    aClass := aClass.ClassParent; 
  End 
end;