本文整理自网络，侵删。
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;
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