Knowledge Base Nr: 00205 XPort2.cpp - http://www.swe-kaiser.de

MFC: Socket-Klasse: Lantronix XPort

  
//www.lantronix.com

//////////////////////////////////////////
//definition

class CXPortSupport : public CAsyncSocket
{
public:
    CXPortSupport(const char* lpszIP);
    virtual ~CXPortSupport();

    int Init();                 //<0:error 0:ok
    int GetGPIO();              //<0:error >=0:value
    int SetGPIO(int nValue);    //<0:error 0:ok

protected:
    CString m_strIP;
    bool m_bConnected;

    int DoGPIOCmd(unsigned char* bufferIn, unsigned char* bufferOut);
};

//////////////////////////////////////////
//sample

void CXporttestDlg::OnToggle()
{
    CXPortSupport xport("192,168,32,123");

    int nErr = xport.Init();
    if (nErr)
        return;

    int nValue = xport.GetGPIO(); //lesen...
    if (nValue<0)
        return;

    nValue = (~nValue)&0x07;
    nErr = xport.SetGPIO(nValue); //...alle bits umdrehen...
    if (nErr)
        return;

    nValue = xport.GetGPIO();     //...zurücklesen
    if (nValue<0)
        return;

    CheckDlgButton(IDC_GPIO0, (nValue&0x01) ? 1 : 0);
    CheckDlgButton(IDC_GPIO1, (nValue&0x02) ? 1 : 0);
    CheckDlgButton(IDC_GPIO2, (nValue&0x04) ? 1 : 0);
}


//////////////////////////////////////////
//implemetierung

#define PORT_GPIO 0x77F0
#define CMDLEN_BUFFERIN 9
#define CMDLEN_BUFFEROUT 5
#define WAITFORANSWER 30

CXPortSupport::CXPortSupport(const char* lpszIP)
{
    m_strIP = lpszIP;
}

CXPortSupport::~CXPortSupport()
{
    Close();
}

int CXPortSupport::Init()
{
  if (Create(PORT_GPIO, SOCK_DGRAM) == 0)
  {
      TRACE("CXPortSupport: Error creating client socket.\n");
    return -1;
  }

    if (!Connect(m_strIP, PORT_GPIO))
  {
        int nErr = GetLastError();
    if (nErr != WSAEWOULDBLOCK)
    {
      Close();

          TRACE("Error connecting to server.");
            return -1;
    }
  }

    return 0;
}

int CXPortSupport::GetGPIO()
{
    unsigned char bufferIn[] = { 0x13, 0,0,0,0, 0,0,0,0 };
    unsigned char bufferOut[20] = {0};

    int nErr = DoGPIOCmd(bufferIn, bufferOut);
    if (nErr)
        return nErr;

    return bufferOut[1];
}

int CXPortSupport::SetGPIO(int nValue)
{
    unsigned char bufferIn[] = { 0x1b, 0x07,0,0,0, 0,0,0,0 };
    unsigned char bufferOut[20] = {0};

    bufferIn[5] = (unsigned char)nValue&0xff;

    int nErr = DoGPIOCmd(bufferIn, bufferOut);
    if (nErr)
        return nErr;

    return 0;
}

int CXPortSupport::DoGPIOCmd(unsigned char* bufferIn, unsigned char* bufferOut)
{
    int nSend = Send(bufferIn, CMDLEN_BUFFERIN);
    if (nSend == SOCKET_ERROR)
    {
        TRACE("CXPortSupport: Error sending to server.\n");
        return -2;
    }

    Sleep(WAITFORANSWER);

    int nRecv = Receive(bufferOut, 2*CMDLEN_BUFFEROUT);
    if (nRecv != CMDLEN_BUFFEROUT)
    {
        TRACE("CXPortSupport: Error reading from server.\n");
        return -3;
    }

    return 0;
}