刚有一段时间没做博客了，今天刚好有人问了这个问题，而自己以前也弄过，于是这里有了一篇新的博文。
关于改造WebBrowser控件的一些技巧，大家可以参考MSDN或者蒋晟写的一个东西，里面有讲的很详细的，今天我就说一下这个alter对话框的修改和过滤的方法：
很简单，只要咱们继承IDocHostShowUI这个接口，实现里面的ShowMessage方法就行了。
废话不多说，代码在这里：
DelphiCode:
unit Unit2;
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;
TForm2 = class(TForm)
WebBrowser1: TWebBrowser;
procedure FormCreate(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;
var
Form2: TForm2;
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),‘不得闲测试‘,65);
Result := S_OK;
end;
procedure TForm2.FormCreate(Sender: TObject);
begin
self.WebBrowser1.Navigate(Application.ExeName + ‘/../test.htm‘);
end;
end.
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Delphi的WebBrowser改造，对网页中Alter等对话框的改造方法（通过COM来改造）
原文：http://www.cnblogs.com/findumars/p/5037632.html