Delphi中WebBrowser拦截网页Alert对话框消息(转)

interface 

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, OleCtrls, SHDocVw, ActiveX;  

type
  IDocHostShowUI = interface(IUnknown)
    ['{c4d244b0-d43e-11cf-893b-00aa00bdce1a}']
    function ShowMessage(hwnd: THandle; lpstrText: POLESTR; lpstrCaption: POLESTR;dwType: longint; lpstrHelpfile: POLESTR; dwHelpContext: longint;var plResult: LRESULT): HRESULT; stdcall;
    function ShowHelp(hwnd: THandle; pszHelpfile: POLESTR; uCommand: integer;dwData: longint; ptMouse: TPoint; var pDispatchObjectHit: IDispatch): HRESULT; stdcall;
  end;  

  TWebBrowser = class(SHDocVw.TWebBrowser,IDocHostShowUI)
  protected
    function ShowMessage(hwnd: THandle; lpstrText: POLESTR; lpstrCaption: POLESTR;dwType: longint; lpstrHelpfile: POLESTR; dwHelpContext: longint;var plResult: LRESULT): HRESULT; stdcall;
    function ShowHelp(hwnd: THandle; pszHelpfile: POLESTR; uCommand: integer;dwData: longint; ptMouse: TPoint; var pDispatchObjectHit: IDispatch): HRESULT; stdcall;
  end;  

type
  TForm1 = class(TForm)
    WebBrowser1: TWebBrowser;
    procedure FormCreate(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;  

var
  Form1: TForm1;  

implementation 

{$R *.dfm} 

{ TWebBrowser } 

function TWebBrowser.ShowHelp(hwnd: THandle; pszHelpfile: POLESTR; uCommand,
  dwData: Integer; ptMouse: TPoint; var pDispatchObjectHit: IDispatch): HRESULT;
begin
  Result := S_FALSE;
end;  

function TWebBrowser.ShowMessage(hwnd: THandle; lpstrText,
  lpstrCaption: POLESTR; dwType: Integer; lpstrHelpfile: POLESTR;
  dwHelpContext: Integer; var plResult: LRESULT): HRESULT;
begin
  //plResult := MessageBoxW(hwnd,PWChar(lpstrText),'Title',);//这里屏蔽了alert
  Result := S_OK;
end;  

procedure TForm1.FormCreate(Sender: TObject);
begin
  WebBrowser1.Navigate('E:/alert.htm');
end;  

end.

方法是实现了IDocHostShowUI接口，重写了弹出消息的方法。