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WinCE HID Driver setreport

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I have written the following source to sent data packet to HID slave device.   I am getting the input,  but I can not see the output on the USB analyzer,   could someone tell me where is my mistake?
 
     HANDLE hReg = NULL;
     HANDLE hQueue = NULL;
     MSGQUEUEOPTIONS msgopts;
     GUID InterfaceClassGuid = DEVCLASS_KEYBOARD_GUID;
 
    output[0]=1;
     output[1]=2;
     dwBytesToWrite=(DWORD)sizeof(output);
 
    memset(&msgopts, 0, sizeof(msgopts));
     msgopts.dwSize = sizeof(msgopts);
     msgopts.dwFlags = 0;
     msgopts.dwMaxMessages = 0;
     msgopts.cbMaxMessage = sizeof(pPNPBuf);
     msgopts.bReadAccess = TRUE;
 
    InitializeCriticalSection(&g_csHidDevices);
 
    hQueue = CreateMsgQueue(NULL, &msgopts);
     if (hQueue == NULL) {printf("Unable to create message queue !\r\n");}
 
   hReg = RequestDeviceNotifications(&InterfaceClassGuid, hQueue, TRUE);
     if (hReg == NULL) 
    {  printf("Unable to RequestDeviceNotifications!\r\n");}
 
   ReadMsgQueue(hQueue, pd, sizeof(pPNPBuf), &dwSize, 0 , &dwFlags);
 
    if (pd->fAttached == TRUE) 
      {
 
          DWORD result = (DWORD)((LPSET_REPORT)(hQueue, HidP_Output, output,                    dwBytesToWrite, 3000));
           if (result == NULL)
             {
               printf("Fail1\n");
             }
             else
             {
               printf("the data has transfered %d\n");
             }
 
}

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WinCE HID Driver setreport Liang Zhu <liangliang.zhu@gmail.com> - 2013-01-28 08:14 -0800

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