为什么接收不到USB的数据，且打开的文件是空的？

这是我的代码，求指教！！！！！！！
mfile.Open(_T("e:\\1.txt"), CFile::modeCreate);
     mfile.Close();
    XferThread = NULL;                //线程禁止
    USBDevice = new CCyUSBDevice(m_hWnd);   // Create an instance of CCyUSBDevice
    if (XferThread) {                //如果线程已经开始
        bLooping = false;            //置线程循环标志为假
                InEndpt->Abort();
                 InEndpt->Reset();
        AfxMessageBox(_T("开始"));
        //m_StartBtn.SetWindowText(_T("be start"));    //开始按钮为“start”
    }
    else {
        if(USBDevice->Open(0))
        InEndpt = USBDevice->EndPointOf(0x02);
        // Launch the looping thread  (Calls XferLoop() function, above.)
        //启动线程循环，调用xferloop函数
        if (USBDevice->IsOpen()) {        //如果USB设备已经打开且传输自己不为0
            bLooping = true;    //线程循环标志为真
            AfxMessageBox(_T("开始读线程"));
            XferThread = AfxBeginThread(XferLoop, this);    //启动线程
            AfxMessageBox(_T("结束"));
        }
        
        //m_StartBtn.SetWindowText(_T("读取结束"));
    }
UINT XferLoop(LPVOID params) {

    OVERLAPPED inOvLap;
    CMFCApplication1Dlg *dlg = (CMFCApplication1Dlg *)params;        //使该线程可访问CBulkLoopDlg类的所有公有成员
    PUCHAR inData = new UCHAR[512];
    CString  str;
    //ZeroMemory(inData, WINDOW_X*WINDOW_Y * 2);   //存储从USB固件发来的数据
    ZeroMemory(inData, 512);
    inOvLap.hEvent = CreateEvent(NULL, false, false, L"CYUSB_IN");
    bool success;
    dlg->InEndpt->TimeOut = 2000;
    for (; dlg->bLooping;) {                        //线程循环，直到循环标志blooping为假
        LONG inlen;
        //inlen = WINDOW_X*WINDOW_Y * 2;
        inlen = 512;
        UCHAR  *inContext = dlg->InEndpt->BeginDataXfer(inData, inlen, &inOvLap);
        dlg->InEndpt->WaitForXfer(&inOvLap, 1200);
        success = dlg->InEndpt->FinishDataXfer(inData, inlen, &inOvLap, inContext);
        if (success) {
            mfile.Open(_T("e:\\1.txt"), CFile::modeWrite);
            mfile.SeekToEnd();
            mfile.Write(inData, inlen);
            mfile.Close();;
        }
        if (!success)
            dlg->bLooping = false;
    }
    CloseHandle(inOvLap.hEvent);
    delete[] inData;
    dlg->XferThread = NULL;
    dlg->USBDevice->Close();

    return true;
}