[Delphi]怎样访问Internet Explorer中的WebBrowser

下面就是一个例子展示如何从打开的Internet Explorer中取得其网页元素的HTML源代码：

---

const
  RSPSIMPLESERVICE = 1;
  RSPUNREGISTERSERVICE = 0;

type
  TObjectFromLResult = function(LRESULT: lResult; const IID: TIID; WPARAM: wParam; out pObject): HRESULT; stdcall;

function GetIEFromHWND(WHandle: HWND; var IE: IWebbrowser2): HRESULT;
var
  hInst: HWND;
  lRes: Cardinal;
  MSG: Integer;
  pDoc: IHTMLDocument2;
  ObjectFromLresult: TObjectFromLresult;
begin
  hInst := LoadLibrary('Oleacc.dll');
  @ObjectFromLresult := GetProcAddress(hInst, 'ObjectFromLresult');
  if @ObjectFromLresult <> nil then
  begin
    try
      MSG := RegisterWindowMessage('WM_HTML_GETOBJECT');
      SendMessageTimeOut(WHandle, MSG, 0, 0, SMTO_ABORTIFHUNG, 1000, lRes);
      Result := ObjectFromLresult(lRes, IHTMLDocument2, 0, pDoc);
      if Result = S_OK then
        (pDoc.parentWindow as IServiceprovider).QueryService(IWebbrowserApp, IWebbrowser2, IE);
    finally
      FreeLibrary(hInst);
    end;
  end;
end;

procedure TForm1.Button1Click(Sender: TObject);
var
  All: IHtmlElementCollection;
  HtmlElement: IHtmlElement;
  I: Integer;
  Document: IHtmlDocument2;
  IE: IWebBrowser2;
  Wnd: HWND;
  WndChild: HWND;
begin
  Wnd := FindWindow('IEFrame', nil);
  if Wnd = 0 then
  begin
    MessageDlg('No Running instance of Internet Explorer!', mtError, [mbOK], 0);
  end;
  // walk Shell DocObject View->Internet Explorer_Server
  WndChild := FindWindowEX(Wnd, 0, 'Shell DocObject View', nil);
  if WndChild <> 0 then
  begin
    WndChild := FindWindowEX(WndChild, 0, 'Internet Explorer_Server', nil);
    if WndChild <> 0 then
    begin
      GetIEFromHWnd(WndChild, IE); //Get Iwebbrowser2 from Handle
      Document := IE.Document as IHtmlDocument2;
      if Assigned(Document) then
      begin
        All := Document.All;
        for I := 0 to All.Length - 1 do
        begin
          HtmlElement := All.item(i, 0) as IhtmlElement;
          SourceView.Lines.Add(IntToStr(i) + ' ' + HTmlElement.innerHTML);
        end;
      end;
    end;
  end;
end;