[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;