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이미저장한 경우인지 확인방법
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  IMSMQQueuePtr     pPeekQ = pInfo->Open(MQ_PEEK_ACCESS, MQ_DENY_NONE);
  // 같은 항목이 존재하는지 확인한 후 삽입한다.
  _variant_t       vtTimeOut((long)1000);        // 1 second until receive time-out
  _variant_t       bvtWantBody((bool)true);      // Set to retrieve message body
  _bstr_t           bstrBody;
  WCHAR   strCur[MAX_PATH];
  IMSMQMessagePtr   pRetMsg(L"MSMQ.MSMQMessage");
  pPeekQ->Reset();
  pRetMsg = pPeekQ->PeekCurrent(&vtMissing, &bvtWantBody, &vtTimeOut );
  while(pRetMsg != NULL)
  {
   ZeroMemory(strCur, sizeof(strCur));
   bstrBody = pRetMsg->Body;
   StringCchCopy(strCur, MAX_PATH, bstrBody);
   if(memcmp(strCur, strMessage, nSize) == 0)
   {
    bExist = TRUE;
    break;
   }

   pRetMsg = pPeekQ->PeekNext(&vtMissing, &bvtWantBody, &vtTimeOut);
  }

  pPeekQ->Close();
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메세지큐에 등록된 갯수얻기
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 int nCount = 0;
 QUEUEPROPID   propId[1];
 MQPROPVARIANT propVar[1];
 HRESULT       propStatus[1];
 DWORD         cprop = 0;

 propId [cprop] = PROPID_MGMT_QUEUE_MESSAGE_COUNT;
 propVar[cprop].vt = VT_NULL;
 ++cprop;
 
 MQMGMTPROPS mqProps;
 mqProps.cProp    = cprop;
 mqProps.aPropID  = propId;
 mqProps.aPropVar = propVar;
 mqProps.aStatus  = propStatus;

 WCHAR wszFormatName[MAX_PATH] ={0};
 WCHAR   *wszFormatNamePrefix = L"queue=DIRECT=OS:";
 StringCchPrintf(wszFormatName, MAX_PATH, L"%s%s\\%s", wszFormatNamePrefix, strPC, Queue);

   HRESULT hr = MQMgmtGetInfo( strPC, wszFormatName, &mqProps );
 if( FAILED( hr ) )
 {
    return 0;
 }
 else
 {
    return mqProps.aPropVar[0].ulVal;
 }
  return nCount;

아래의 코드와 같다.
코드 빌드는 해보지 않아서 오류있을 수 있음, 하지만 방법은 이렇게하면된다.
HMODULE hMod = NULL;
typedef BOOL (WINAPI *PFN_CHANGEWINDOWMESSAGEFILTER(UINT message, DWORD dwFlag);

CHANGEWINDOWMESSAGEFILTER fnChgMsgFilter;
hMod = LoadLibrary("USER32.DLL");
if(hMod != NULL)
{
 fnChgMsgFilter=(PFN_CHANGEWINDOWMESSAGEFILTER)GetProcAddress(hMod,"ChangeWindowMessageFilter");
 if(fnChgMsgFilter != NULL)
 {
     fnChgMsgFilter (WM_xxx,1);
 }
}