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, 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;

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, hTabWnd, 'Frame Tab', nil);
           if hTabWnd <> 0 then hCldWnd := FindWindowEx(hTabWnd, 0, 'TabWindowClass', nil);
           if hCldWnd <> 0 then hCldWnd := FindWindowEx(hCldWnd, 0, 'Shell DocObject View', nil);
           if hCldWnd <> 0 then hCldWnd := FindWindowEx(hCldWnd, 0, '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; 





function Tfrm_Main.GetValueByHTMLDocument(): string;
var
  Dispatch: IDispatch;
  Web: IWebBrowser2;
  ShellWindow: IShellWindows;
  i: integer;
  sUserID,sIP: string;
  Finput: IHTMLInputElement;
  HTMLDocument: IHTMLDocument2;
  LoginListTemp:array[1..7]of string;
begin
  Result := '';

  // tmr3.Enabled:= False;

  ShellWindow := CoShellWindows.Create;
  Move(ListLogin,LoginListTemp,SizeOf(LoginListTemp));
  for i := 0 to ShellWindow.Count do
  begin
    try
      Dispatch := ShellWindow.Item(i);
      if Dispatch = nil then continue;
      Dispatch.QueryInterface(IWebBrowser2, Web);
      if Web = nil then continue;
      if Pos('iexplore.exe', LowerCase(Web.FullName)) = 0 then Continue;

      if Pos('http://15.0.32.10:1320/cos_tapp/', LowerCase(Web.LocationURL)) <0 then Continue;

      Web.Document.QueryInterface(IHTMLDocument2, HTMLDocument);

      if HTMLDocument = nil then Exit;

      Finput := HTMLDocument.all.item('ipt_userCode',varEmpty) as IHTMLInputElement;

      if Finput <> nil then
      begin
        Result := Finput.value;  // 工号

        if AnsiIndexText(Result, ListLogin) >= 0 then
        begin
          try
             sIP := GUserParam.UserIP;
             //WriteTxtLog('  IP: '+sIP+', 尝试登陆调度工号: '+Result+'。');
             HTMLDocument.parentWindow.execScript('document.getElementById(''ipt_userCode'').value=''您已被记录，请不要尝试登陆调度工号！'';','javascript');
             IPCrab(sIP);

          except on e: Exception do
            begin
              WriteLog('浏览器安全等级过高，请降低安全等级！ ' + e.Message,'E');
            end;
          end;
        end;
      end;
    except on e: Exception do
      begin

      end;
    end;
  end;
end;