unit Main;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  ShlIntf, ActiveX, ComObj, StdCtrls, StrTools;

type
  TAutoCompleteForm = class(TForm)
    CompletionEdit: TEdit;
    CompletionLabel: TLabel;
    SourceGroupBox: TGroupBox;
    SourceMemo: TMemo;
    procedure FormCreate(Sender: TObject);
  private
    FAutoComplete: IAutoComplete2;
    FStrings: IUnknown;
  end;

var
  AutoCompleteForm: TAutoCompleteForm;

implementation

{$R *.DFM}

{ TAutoCompleteForm }

procedure TAutoCompleteForm.FormCreate(Sender: TObject);
begin
  FAutoComplete  := CreateComObject(CLSID_AutoComplete) as IAutoComplete2;
  FStrings := TEnumString.Create(SourceMemo.Lines) as IUnknown;
  OleCheck(FAutoComplete.SetOptions(ACO_AUTOSUGGEST or ACO_UPDOWNKEYDROPSLIST));
  OleCheck(FAutoComplete.Init(CompletionEdit.Handle, FStrings, nil, nil));
end;

end.