cTCPSerial Class Reference

Low-level communication class to access a CAN port. More...

#include <tcpserial.h>

Inheritance diagram for cTCPSerial:

Public Member Functions
void	Close (void) throw (cTCPSerialException*)
	Close the previously opened CAN ESD interface port.
	cTCPSerial (char const _tcp_adr, int _tcp_port, double _timeout) throw (cTCPSerialException)
virtual tErrorCode	GetErrorNumber ()
bool	IsOpen (void) throw ()
	Return true if interface to CAN ESD is open.
void	Open (void) throw (cTCPSerialException*)
ssize_t	Read (void data, ssize_t size, long timeout_us, bool return_on_less_data) throw (cTCPSerialException)
void	SetTimeout (double _timeout) throw (cSerialBaseException*)
	set the timeout for next readline() calls (negative value means: no timeout, wait for ever)
int	write (char const ptr, int len=0) throw (cTCPSerialException)
	Write data to a previously opened port.
Static Public Attributes
static double const	TIMEOUT_RETURN_IMMEDITELY_S
static long const	TIMEOUT_RETURN_IMMEDITELY_US
static double const	TIMEOUT_WAIT_FOR_EVER_S
static long const	TIMEOUT_WAIT_FOR_EVER_US
Protected Attributes
int	fd
	the file descriptor of the socket
std::string	tcp_adr
int	tcp_port
	the TCP port to use
Static Protected Attributes
static const int	INVALID_SOCKET = -1
Private Attributes
struct timeval	timeout_timeval
	timeout for setsockopt
long	timeout_us
	cached timeout in us for read()

Detailed Description

Low-level communication class to access a CAN port.

Definition at line 88 of file tcpserial.h.

Constructor & Destructor Documentation

cTCPSerial::cTCPSerial	(	char const *	_tcp_adr,
		int	_tcp_port,
		double	_timeout
	)			throw (cTCPSerialException*)

Constructor: constructs an object to communicate with an SDH via TCP on _tcp_adr and _tcp_port.

Parameters:

_tcp_adr

- a string describing the hostname or IP address of the SDH

_tcp_port

- the port number on the SDH

_timeout

- the timeout when receiving / sending data:

< 0.0 : no timeout = wait for ever
== 0.0 : zero timeout = return immediately
> 0.0 : timeout in seconds

Member Function Documentation

void cTCPSerial::Close ( void ) throw (cTCPSerialException*) [virtual]

Close the previously opened CAN ESD interface port.

Implements cSerialBase.

virtual tErrorCode cTCPSerial::GetErrorNumber ( ) [inline, virtual]

Overloaded helper function that returns the last TCP error number.

Definition at line 173 of file tcpserial.h.

bool cTCPSerial::IsOpen ( void ) throw () [virtual]

Return true if interface to CAN ESD is open.

Implements cSerialBase.

void cTCPSerial::Open ( void ) throw (cTCPSerialException*) [virtual]

Open the device as configured by the parameters given to the constructor

Implements cSerialBase.

ssize_t cTCPSerial::Read	(	void *	data,
		ssize_t	size,
		long	timeout_us,
		bool	return_on_less_data
	)			throw (cTCPSerialException*) `[virtual]`

Read data from device. This function waits until max_time_us us passed or the expected number of bytes are received via serial line. if (return_on_less_data is true (default value), the number of bytes that have been received are returned and the data is stored in data If the return_on_less_data is false, data is only read from serial line, if at least size bytes are available.

Implements cSerialBase.

void cTCPSerial::SetTimeout ( double _timeout ) throw (cSerialBaseException*) [virtual]

set the timeout for next readline() calls (negative value means: no timeout, wait for ever)

Reimplemented from cSerialBase.