如何从Internet Explorer_Server窗口句柄获得IHTMLDocument

今天用到了，从网上搜了个方法，关键代码如下：

#include <OleAcc.h>
#pragma comment(lib, "OleAcc.lib")

  
    //hWnd：Internet Explorer_Server

    LRESULT lResult = 0;
    UINT uMessage = ::RegisterWindowMessage(_T("WM_HTML_GETOBJECT"));
    ::SendMessageTimeout(hWnd, uMessage, 0, 0, SMTO_ABORTIFHUNG, 1000, (DWORD*)&lResult);

    CComQIPtr<IHTMLDocument> pDoc;
    ::ObjectFromLresult(lResult, IID_IHTMLDocument, 0, (void**)&pDoc);