用delphi 在Word上面增加一个按钮

新建一个Active Library
2. 新建一个COM Object，在Class Name填一个名字，如Test。
点一下Implemented Interface后面的List按钮。再点一下对话框中的Add Library按钮，
选择“Program Files\Common Files\Designer”目录下的msaddndr.dll文件。
然后在列表中找到msaddndr.dll里面的_IDTExtensibility2接口点击确定。
3. 现在Com AddIn部分已经完成，现在要在Word里面加一个CommandBar和一个按钮，并且让按钮响应事件。
4. 创建一个TcommandBarButton的OleServer类以连接到CommandButton并响应事件。代码：如下
定义部分
TCommandBarButtonClick = procedure(const Ctrl: OleVariant; var CancelDefault: OleVariant) of Object;
TCommandBarButton = class(TOleServer)
private
FIntf: CommandBarButton;
FOnClick: TCommandBarButtonClick;
function GetDefaultInterface: CommandBarButton;
procedure SetOnClick(const Value: TCommandBarButtonClick);
protected
procedure InitServerData; override;
procedure InvokeEvent(DispID: TDispID; var Params: TVariantArray); override;
public
constructor Create(AOwner: TComponent); override;
destructor Destroy; override;
procedure Connect; override;
procedure ConnectTo(svrIntf: CommandBarButton);
procedure Disconnect; override;
property DefaultInterface: CommandBarButton read GetDefaultInterface;
published
property OnClick : TCommandBarButtonClick read FOnClick write SetOnClick;
end;
实施部分
{ TCommandBarButton }
procedure TCommandBarButton.Connect;
var
punk: IUnknown;
begin
if FIntf = nil then
begin
punk := GetServer;
ConnectEvents(punk);
Fintf:= punk as CommandBarButton;
end;
end;
procedure TCommandBarButton.ConnectTo(svrIntf: CommandBarButton);
begin
Disconnect;
FIntf := svrIntf;
ConnectEvents(FIntf);
end;
constructor TCommandBarButton.Create(AOwner: TComponent);
begin
inherited;
end;
destructor TCommandBarButton.Destroy;
begin
inherited;
end;
procedure TCommandBarButton.Disconnect;
begin
if Fintf <> nil then
begin
DisconnectEvents(FIntf);
FIntf := nil;
end;
end;
function TCommandBarButton.GetDefaultInterface: Com