Delphi通过IE窗口句柄获取网页接口IWebBrowser2

主要用到的是MSAA(Microsoft Active Accessibility) 函数：ObjectFromLResult，该函数在动态链接库 oleacc.dll 中定义。

uses SHDocVw,MsHtml,ActiveX;

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

调用例子，以下代码快速关闭所有打开的IE窗口：

procedure TForm1.Button1Click(Sender: TObject);
var
    hCurWindow,hMainWnd,hTabWnd,hCldWnd:HWnd; //窗口句柄
    WinClsName:array[0..255] of char;
    IE1: IWebbrowser2;
begin
    hCurWindow := GetWindow(Handle,GW_HWNDFirst);  //获取第一个窗口的句柄
    while hCurWindow<>0 do
    begin
       GetClassName(hCurWindow,@WinClsName,255);
       if String(WinClsName) = 'IEFrame' then
       begin
         hMainWnd := hCurWindow;
         hCldWnd := hCurWindow;
         hTabWnd := 0;
         repeat //循环查找所有选项卡
           hTabWnd := FindWindowEx(hMainWnd,'Frame Tab',nil);
           if hTabWnd <> 0 then hCldWnd := FindWindowEx(hTabWnd,'TabWindowClass',nil);
           if hCldWnd <> 0 then hCldWnd := FindWindowEx(hCldWnd,'Shell DocObject View','Internet Explorer_Server',nil);
           if hCldWnd <> 0 then if GetIEFromHWnd(hCldWnd,IE1) = S_OK then //获取IWebBrowser2
           begin
             IE1.Quit; //关闭IE，也可以执行其他操作，呵呵
           end;
         until hTabWnd = 0;
       end;
       hCurWindow:=GetWindow(hCurWindow,GW_HWNDNEXT); //获取下一个窗口的句柄
    end;
end;