DataModule Designer instance    資料來源: www.delphi3000.com    Question:   I can retreive instance of Designer for forms as their property "Designer", but how to retreive it for DataModule like objects?    Answer:    For receiving instance of Designer for forms you should just get form's property "Designer".  But how to receive the Designer instance if you have only DataModule's instance?     It is very simply: the DataModule is an usual VCL component and its owner is hidden form, so for retreiving Designer instance of DataModule just retreive "Designer" property of DataModule's owner.  The function below demonstrates retreiving Designer instance for any form in your project by its name. This function is useful when Designer instance is necessary for your experts.     Add these definitions: 

   {$IFDEF VER120} 
   TFormDesigner= IFormDesigner; 
   {$ENDIF} 
   {$IFDEF VER125} 
   TFormDesigner= IFormDesigner; 
   {$ENDIF} 
   {$IFDEF VER130} 
   TFormDesigner= IFormDesigner; 
   {$ENDIF}     function GetDesigner(FToolServices: TIToolServices; FormName: string): TFormDesigner; 
var 
   tmpC: TComponent; 
begin 
  Result := nil; 
  with FToolServices.GetFormModuleInterface(FormName).GetFormInterface.GetFormComponent do begin 
      tmpC := GetComponentHandle; 
      if (tmpC is TCustomForm) then begin 
// We have the usual form 
        Result := TFormDesigner(TCustomForm(tmpC).Designer); 
        Exit; 
      end 
      else   
// We have the DataModule or WebModule or something else 
       Result := TFormDesigner(TCustomForm(tmpc.Owner).Designer); 
    end; 
end;     For receiving Designer without using ToolServices you can use following function:     finction GetDesigner(AComp: TComponent): TFormDesigner; 
var 
  tmpC: TComponent; 
begin 
  Result = nil; 
  if not Assigned(AComp) then Exit; 
  if AComp is TCustomForm then 
    Result := TFormDesigner(TCustomForm(AComp).Designer) 
  else begin 
    tmpC := AComp; 
    while true do begin 
      if Assigned(tmpC.Owner) then tmpC := tmpC.Owner 
      else break; 
      if tmpC is TCustomForm then begin 
        Result := TFormDesigner(TCustomForm(AComp).Designer); 
        break; 
      end; 
    end; 
  end; 
end; 

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