delphi WebBrowser的使用方法详解（三）

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<PRE>WebBrowser1.GoHome; //到浏览器默认主页
WebBrowser1.Refresh; //刷新
WebBrowser1.GoBack; //后退
WebBrowser1.GoForward; //前进
WebBrowser1.Navigate('...'); //打开指定页面
WebBrowser1.Navigate('about:blank'); //打开空页面
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<PRE>//打开空页面, 并写入...
WebBrowser1.Navigate('about:<head><title>标题</title><body>页面内容</body>');
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<PRE>//读取网页脚本中的变量:
procedure TForm1.Button1Click(Sender: TObject);
var
s: string;
i: Integer;
begin
s := WebBrowser1.OleObject.document.Script.str;
i := WebBrowser1.OleObject.document.Script.num;
ShowMessage(s); //Hello
ShowMessage(IntToStr(i)); //99
//也可以这样读:
s := WebBrowser1.OleObject.document.parentWindow.str;
i := WebBrowser1.OleObject.document.parentWindow.num;
ShowMessage(s); //Hello
ShowMessage(IntToStr(i)); //99
end;</PRE>

假如网页中有这样的语句:

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<PRE>//调用网页脚本中的函数:
procedure TForm1.Button1Click(Sender: TObject);
begin
WebBrowser1.OleObject.document.parentWindow.MB(); //HTML-Js
//如需指定脚本语言, 需要:
WebBrowser1.OleObject.document.parentWindow.execScript('MB()','JavaScript'); //HTML-Js
end;</PRE>

假如有这样的脚本:

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<PRE>//判断网页及内部框架网页是否全部下载完毕
procedure TForm1.WebBrowser1DocumentComplete(ASender: TObject;
const pDisp: IDispatch; var URL: OleVariant);
begin
if WebBrowser1.Application = pDisp then
begin
Text := '网页下载完毕！';
end;
end;</PRE>

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<PRE>//改变背景色或背景图片:
WebBrowser1.OleObject.document.body.bgcolor := '#FF0000';
WebBrowser1.OleObject.document.body.background := '...图片地址';
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<PRE>//操作有 ID 标签的对象:
var
s: string;
begin
s := WebBrowser1.OleObject.document.getElementById('span1').innerText;
ShowMessage(s); //这是 span1 标签中的内容
//或者:
s := WebBrowser1.OleObject.document.parentWindow.span1.innerText;
ShowMessage(s); //这是 span1 标签中的内容
//隐藏它:
WebBrowser1.OleObject.document.parentWindow.span1.style.display := 'none';
end;</PRE>

假如网页中有这样的内容:这是 span1 标签中的内容

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<PRE>//获取网页源代码
var
s: string;
begin
s := WebBrowser1.OleObject.document.body.innerHTML; //body内的所有代码
s := WebBrowser1.OleObject.document.body.outerHTML; //body内的所有代码, 包含body标签
s := WebBrowser1.OleObject.document.documentElement.innerHTML; //html内的所有代码
end;
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<PRE>//WebBrowser 中的右键菜单
//先要添加ApplicationEvents1,指定其Message事件
//屏蔽右键菜单
procedure TForm1.ApplicationEvents1Message(var Msg: tagMSG; var Handled: Boolean);
begin
with Msg do
begin
if not IsChild(WebBrowser1.Handle, hWnd) then Exit;
Handled := (message = WM_RBUTTONDOWN) or (message = WM_RBUTTONUP) or (message = WM_CONTEXTMENU);
end;
end;
//替换右键菜单
procedure TForm1.ApplicationEvents1Message(var Msg: tagMSG; var Handled: Boolean);
var mPoint: TPoint;
begin
if IsChild(WebBrowser1.Handle, Msg.Hwnd) and
((Msg.Message = WM_RBUTTONDOWN) or (Msg.Message = WM_RBUTTONUP)) then
begin
GetCursorPos(mPoint); //得到光标位置
PopupMenu1.Popup(mPoint.X, mPoint.Y); //弹出popupmenu1的菜单
Handled:=True;
end;
end;
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<PRE>//新页面写入
begin
WebBrowser1.Navigate('about:blank');
WebBrowser1.OleObject.Document.Writeln('ok');
end;
//从流中写入:
var
ms: TMemoryStream;
begin
ms := TMemoryStream.Create;
Memo1.Lines.SaveToStream(ms);
ms.Position := 0;
(WebBrowser1.Document as IPersistStreamInit).Load(TStreamAdapter.Create(ms));
ms.Free;
end;
//禁止提示脚步错误
procedure TForm1.WebBrowser1NavigateComplete2(ASender: TObject;
const pDisp: IDispatch; var URL: OleVariant);
begin
WebBrowser1.Silent := True;
end;
以上转自<A id=Header1_HeaderTitle class=headermaintitle href="http://www.cnblogs.com/del/" target=_blank>万一的 Delphi 博客</A></PRE><PRE>//禁止弹出窗口</PRE><PRE>procedure TForm1.wb1NewWindow2(ASender: TObject; var ppDisp: IDispatch; </PRE><PRE>var </PRE><PRE>Cancel: WordBool);</PRE><PRE>begin </PRE><PRE> Cancel := True; </PRE><PRE> Wb1.OleObject.document.parentWindow.execScript('window.alert=null;','JavaScript');
Wb1.OleObject.document.parentWindow.execScript('window.open=null;','JavaScript');
Wb1.OleObject.document.parentWindow.execScript('window.close=null;','JavaScript');
Wb1.OleObject.document.parentWindow.execScript('window.showModalDialog=null;','JavaScript');
Wb1.OleObject.document.parentwindow.execscript('function confirm() {return true;}','Javascript');//自动点击确认框</PRE><PRE>end;
</PRE><PRE>获取网页所有框架的源代码：
</PRE><PRE>function GetSources(FWB:TWebbrowser):String;
var
i : Integer;
title : string;
s : string;
ole_index : OleVariant;
frame_dispatch : IDispatch;
frame_win : IHTMLWindow2;
doc2 : IHTMLDocument2;
begin
try
Result := '';
s := title+(FWB.Document as Ihtmldocument2).body.outerHTML;
doc2 := FWB.Document as IHTMLDocument2;
if doc2.Frames.length>0 then
begin
for i :=0 to doc2.Frames.length-1 do
begin
ole_index := i;
frame_dispatch := doc2.Frames.Item(ole_index);
if Assigned(frame_dispatch) then
begin
frame_win := frame_dispatch as IHTMLWindow2;
frame_doc := frame_win.document;
if Assigned(frame_doc.body) then
s := s+IHTMLDocument2(frame_doc).body.outerHTML;</PRE><PRE> end;
end;</PRE><PRE> end;
Result := s;
except
end;
end;</PRE><PRE>注:需要引用mshtml，这里只涉及到含有一层框架，如果有多层框架自己去扩充即可；同理利用相同方法可以获取所有框架的超链接、图片等信息。
</PRE>

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