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;