servauto.pas

《Delphi开发人员指南》配书原码

unit ServAuto;

interface

uses
  ComObj, ActiveX, AxCtrls, Server_TLB;

type
  TServerWithEvents = class(TAutoObject, IConnectionPointContainer, IServerWithEvents)
  private
    { Private declarations }
    FConnectionPoints: TConnectionPoints;
    FEvents: IServerWithEventsEvents;
    procedure MemoChange(Sender: TObject);
  public
    procedure Initialize; override;
  protected
    { Protected declarations }
    property ConnectionPoints: TConnectionPoints read FConnectionPoints
      implements IConnectionPointContainer;
    procedure EventSinkChanged(const EventSink: IUnknown); override;
    procedure Clear; safecall;
    procedure AddText(const NewText: WideString); safecall;
  end;

implementation

uses ComServ, ServMain, SysUtils, StdCtrls;

procedure TServerWithEvents.EventSinkChanged(const EventSink: IUnknown);
begin
  FEvents := EventSink as IServerWithEventsEvents;
end;

procedure TServerWithEvents.Initialize;
begin
  inherited Initialize;
  FConnectionPoints := TConnectionPoints.Create(Self);
  if AutoFactory.EventTypeInfo <> nil then
    FConnectionPoints.CreateConnectionPoint(AutoFactory.EventIID,
      ckSingle, EventConnect);
  // Route main form memo's OnChange event to MemoChange method:
  MainForm.Memo.OnChange := MemoChange;
end;

procedure TServerWithEvents.Clear;
begin
  MainForm.Memo.Lines.Clear;
  if FEvents <> nil then FEvents.OnClear;
end;

procedure TServerWithEvents.AddText(const NewText: WideString);
begin
  MainForm.Memo.Lines.Add(NewText);
end;

procedure TServerWithEvents.MemoChange(Sender: TObject);
begin
  if FEvents <> nil then FEvents.OnTextChanged((Sender as TMemo).Text);
end;

initialization
  TAutoObjectFactory.Create(ComServer, TServerWithEvents,
    Class_ServerWithEvents, ciMultiInstance, tmApartment);
end.