TWebBrowser 与 MSHTML(1): 从 TWebBrowser 获取 DOM 中的 window 对象

借助 TWebBrowser 可以把软件做的更漂亮、更灵活, 很多软件已经或者早就这样做了.

尽管 HTML DOM 内容繁杂(涉及到 HTML、JavaScript、CSS), 但也都属于 TWebBrowser 的功能范围.

使用 TWebBrowser 时, 如果配合上 MSHTML, 将会有很好的代码提示; 不然也可以, 就是写代码困难.

HTML DOM 中的一切都是源于一个叫 window 对象, 为了和 JS 中的 DOM 一致起来, 本次先获取这个对象.

TWebBrowser 是调用 SHDocVw.dll 的功能并继承与 TOleControl 类, 会用到 SHDocVw 和 OleCtrls 单元.

另外 window 是 IHTMLWindow2 接口类型的, 此接口定义在 MSHTML 单元.

 示例图:

 

代码文件:
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unit Unit1;

interface

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

type
TForm1 = class(TForm)
WebBrowser1: TWebBrowser;
Button1: TButton;
Button2: TButton;
procedure FormCreate(Sender: TObject);
procedure Button1Click(Sender: TObject);
procedure Button2Click(Sender: TObject);
end;

var
Form1: TForm1;

implementation

{$R *.dfm}

uses MSHTML;
var window: IHTMLWindow2;

{打开一个页面}
procedure TForm1.Button1Click(Sender: TObject);
begin
WebBrowser1.Navigate('http://del.cnblogs.com');
end;

{获取并试用 window 对象}
procedure TForm1.Button2Click(Sender: TObject);
begin
window := (WebBrowser1.Document as IHTMLDocument2).parentWindow;
window.document.body.innerHTML := '<hr>万一的 Delphi 博客<hr>';
window.alert('JavaScript 的提示: 修改成功!');
end;

{初始化}
procedure TForm1.FormCreate(Sender: TObject);
begin
Position := poScreenCenter;
WebBrowser1.Align := alTop;
Button1.Caption := '打开';
Button2.Caption := '改写';
end;

end.
--------------------------------------------------------------------------------

窗体文件:
--------------------------------------------------------------------------------

object Form1: TForm1
Left = 0
Top = 0
Caption = 'Form1'
ClientHeight = 167
ClientWidth = 318
Color = clBtnFace
Font.Charset = DEFAULT_CHARSET
Font.Color = clWindowText
Font.Height = -11
Font.Name = 'Tahoma'
Font.Style = []
OldCreateOrder = False
OnCreate = FormCreate
PixelsPerInch = 96
TextHeight = 13
object WebBrowser1: TWebBrowser
Left = 8
Top = 8
Width = 300
Height = 121
TabOrder = 0
ControlData = {
4C000000021F0000810C00000000000000000000000000000000000000000000
000000004C000000000000000000000001000000E0D057007335CF11AE690800
2B2E126208000000000000004C0000000114020000000000C000000000000046
8000000000000000000000000000000000000000000000000000000000000000
00000000000000000100000000000000000000000000000000000000}
end
object Button1: TButton
Left = 154
Top = 135
Width = 75
Height = 25
Caption = 'Button1'
TabOrder = 1
OnClick = Button1Click
end
object Button2: TButton
Left = 235
Top = 135
Width = 75
Height = 25
Caption = 'Button2'
TabOrder = 2
OnClick = Button2Click
end
end
--------------------------------------------------------------------------------

从一个外部的 IE 窗口获取 window 对象也可以:
--------------------------------------------------------------------------------

uses MSHTML, ComObj;
var
IE: Variant;
window: IHTMLWindow2;

procedure TForm1.Button1Click(Sender: TObject);
begin
IE := CreateOleObject('InternetExplorer.Application');
IE.Visible := True;
IE.Navigate('http://del.cnblogs.com');
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
window := (IDispatch(IE.document) as IHTMLDocument2).parentWindow;
window.document.body.innerHTML := '<hr>万一的 Delphi 博客<hr>';
end;

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