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

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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;
}