用VC编写与HID设备通信程序遇到问题！

大家好，现在情况是这样的，HID设备可以正常枚举并且Windows提示可以使用，我也基本知道了在 VC中如何访问HID设备，但是现在的问题是，CreateFile之后可以得到正确的句炳，并且HidD_GetAttributes，HidD_GetPreparsedData以及HidP_GetCaps都正确得到了预期数据，但是我试图用WriteFile()或者HidD_SetOutputReport()时就提示出错，我查了出错代码是"invalid function"，请问这是什么原因啊，实现搞不明白？PS：我上MSDN看了，步骤都是这样的，怎么会invalid呢？这是应该跟固件没有关系吧？是跟系统有关吗，我的是XP？

源代码如下图：

难道这里就没有人知道吗，我在网上搜了很多贴基本上都没有这个问题的正确答案，高手来帮帮忙吧，急啊！

前面看都是对的，试试这么读呢
。。。。
PrepareForOverlappedTransfer();
ReadReport()
。。。。
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
void CUsbhidiocDlg::PrepareForOverlappedTransfer()
{
    //Get another handle to the device for the overlapped ReadFiles.
    ReadHandle=CreateFile
        (detailData->DevicePath,
        GENERIC_READ|GENERIC_WRITE,
        FILE_SHARE_READ|FILE_SHARE_WRITE,
        (LPSECURITY_ATTRIBUTES)NULL,
        OPEN_EXISTING,
        FILE_FLAG_OVERLAPPED,
        NULL);
    DisplayLastError("CreateFile (ReadHandle): ");

    //Get an event object for the overlapped structure.

    /*API function: CreateEvent
    Requires:
      Security attributes or Null
      Manual reset (true). Use ResetEvent to set the event object's state to non-signaled.
      Initial state (true = signaled)
      Event object name (optional)
    Returns: a handle to the event object
    */

    if (hEventObject == 0)
    {
        hEventObject = CreateEvent
            (NULL,
            TRUE,
            TRUE,
            "");
    DisplayLastError("CreateEvent: ") ;

    //Set the members of the overlapped structure.
    HIDOverlapped.hEvent = hEventObject;
    HIDOverlapped.Offset = 0;
    HIDOverlapped.OffsetHigh = 0;
    }
}
/////////////////////////////////////////////////////////////////////////////////////////
void CUsbhidiocDlg::ReadReport()
{
    CString    ByteToDisplay = "";
    CString    MessageToDisplay = "";
    DWORD    Result;
    
    //Read a report from the device.
    
    /*API call:ReadFile
    'Returns: the report in InputReport.
    'Requires: a device handle returned by CreateFile
    '(for overlapped I/O, CreateFile must be called with FILE_FLAG_OVERLAPPED),
    'the Input report length in bytes returned by HidP_GetCaps,
    'and an overlapped structure whose hEvent member is set to an event object.
    */

    Result = ReadFile
        (ReadHandle,
        InputReport,
        Capabilities.InputReportByteLength,
        &NumberOfBytesRead,
        (LPOVERLAPPED) &HIDOverlapped);
 

    /*API call:WaitForSingleObject
    'Used with overlapped ReadFile.
    'Returns when ReadFile has received the requested amount of data or on timeout.
    'Requires an event object created with CreateEvent
    'and a timeout value in milliseconds.
    */

    Result = WaitForSingleObject
        (hEventObject,
        20);//?600
 
    switch (Result)
    {
    case WAIT_OBJECT_0:
        {
        break;
        }
    case WAIT_TIMEOUT:
        {
        //Cancel the Read operation.

        /*API call: CancelIo
        Cancels the ReadFile
        Requires the device handle.
        Returns non-zero on success.
        */
        
        Result = CancelIo(ReadHandle);
        
        //A timeout may mean that the device has been removed.
        //Close the device handles and set DeviceDetected = False
        //so the next access attempt will search for the device.
        break;
    default:
        ValueToDisplay.Format("%s", "Undefined error");
        break;
        }
    }

    /*
    API call: ResetEvent
    Sets the event object to non-signaled.
    Requires a handle to the event object.
    Returns non-zero on success.
    */

    ResetEvent(hEventObject);

    //Display the report data.
    DisplayInputReport();
}

写
    Result = WriteFile
        (DeviceHandle,
        OutputReport,
        Capabilities.OutputReportByteLength,
        &BytesWritten,
        NULL);

    if (Result == 0)
    {
        //The WriteFile failed, so close the handle, display a message,
        //and set DeviceDetected to FALSE so the next attempt will look for the device.
        CloseHandle(DeviceHandle);
        CloseHandle(ReadHandle);
        DisplayData("Can't write to device");
        DeviceDetected = FALSE;
    }

上面是改网上找的HID VC例子，用来读HID遥控器，正常工作。