#include <visp3/core/vpClient.h>

Inheritance diagram for vpClient:

Public Member Functions
	vpClient ()

virtual	~vpClient ()

bool	connectToHostname (const std::string &hostname, const unsigned int &port_serv)

bool	connectToIP (const std::string &ip, const unsigned int &port_serv)

void	deconnect (const unsigned int &index=0)

unsigned int	getNumberOfAttempts ()

unsigned int	getNumberOfServers ()

void	print ()

void	setNumberOfAttempts (const unsigned int &nb)

void	stop ()

void	addDecodingRequest (vpRequest *)

int	getReceptorIndex (const char *name)

std::string	getRequestIdFromIndex (const int &ind)

unsigned int	getMaxSizeReceivedMessage ()

void	print (const char *id="")

template<typename T >
int	receive (T *object, const unsigned int &sizeOfObject=sizeof(T))

template<typename T >
int	receiveFrom (T *object, const unsigned int &receptorEmitting, const unsigned int &sizeOfObject=sizeof(T))

std::vector< int >	receiveRequest ()

std::vector< int >	receiveRequestFrom (const unsigned int &receptorEmitting)

int	receiveRequestOnce ()

int	receiveRequestOnceFrom (const unsigned int &receptorEmitting)

std::vector< int >	receiveAndDecodeRequest ()

std::vector< int >	receiveAndDecodeRequestFrom (const unsigned int &receptorEmitting)

int	receiveAndDecodeRequestOnce ()

int	receiveAndDecodeRequestOnceFrom (const unsigned int &receptorEmitting)

void	removeDecodingRequest (const char *)

template<typename T >
int	send (T *object, const int unsigned &sizeOfObject=sizeof(T))

template<typename T >
int	send (T *object, const unsigned int &sizeOfObject)

template<typename T >
int	sendTo (T *object, const unsigned int &dest, const unsigned int &sizeOfObject=sizeof(T))

int	sendRequest (vpRequest &req)

int	sendRequestTo (vpRequest &req, const unsigned int &dest)

int	sendAndEncodeRequest (vpRequest &req)

int	sendAndEncodeRequestTo (vpRequest &req, const unsigned int &dest)

void	setMaxSizeReceivedMessage (const unsigned int &s)

void	setTimeoutSec (const long &sec)

void	setTimeoutUSec (const long &usec)

void	setVerbose (const bool &mode)

Protected Attributes
vpEmitter	emitter

std::vector< vpReceptor >	receptor_list

fd_set	readFileDescriptor

int	socketMax

std::vector< vpRequest * >	request_list

unsigned int	max_size_message

std::string	separator

std::string	beginning

std::string	end

std::string	param_sep

std::string	currentMessageReceived

struct timeval	tv

long	tv_sec

long	tv_usec

bool	verboseMode

Detailed Description

This class represents a Transmission Control Protocol (TCP) client.

TCP provides reliable, ordered delivery of a stream of bytes from a program on one computer to another program on another computer.

Exemple of client's code, receiving and sending basic message It corresponds to the client used in the first exemple of vpServer class' documentation:

#include <iostream>
#include <visp3/core/vpClient.h>
int main(int argc, char **argv)
{
  std::string servername = "localhost";
  unsigned int port = 35000;
  vpClient client;
  client.connectToHostname(servername, port);
  //client.connectToIP("127.0.0.1",port);
  int val = 0;
  while(1)
  {
    // Sending the new value to the first client
    if(client.send(&val) != sizeof(int))
      std::cout << "Error while sending" << std::endl;
    else
      std::cout << Sending : " << val << std::endl;
    // Receiving a value from the first client
    if(client.receive(&val) != sizeof(int))
      std::cout << "Error while receiving" << std::endl;
    else
      std::cout << "Received : " << val << std::endl;
  }
  return 0;
}

Exemple of client's code, sending a vpImage on request form. It correspond to the server used in the second exemple of vpServer class' documentation.

#include <iostream>
#include <visp3/core/vpClient.h>
#include <visp3/core/vpImage.h>
#include <visp3/gui/vpDisplayGDI.h>
#include <visp3/gui/vpDisplayX.h>
#include <visp3/sensor/vpV4l2Grabber.h>
#include "vpRequestImage.h" //See vpRequest class documentation
int main(int argc, char **argv)
{
#if defined(VISP_HAVE_V4L2)
  std::string servername = "localhost";
  unsigned int port = 35000;
  vpImage<unsigned char> I; // Create a gray level image container
  // Create a grabber based on v4l2 third party lib (for usb cameras under
  // Linux)
  vpV4l2Grabber g;
  g.setScale(1);
  g.setInput(0);
  g.open(I);
  // Create an image viewer
#if defined(VISP_HAVE_X11)
  vpDisplayX d(I, -1, -1, "Camera frame");
#elif defined(VISP_HAVE_GDI) //Win32
  vpDisplayGDI d(I, -1, -1, "Camera frame");
#endif
  vpClient client;
  client.connectToHostname(servername, port);
  //client.connectToIP("127.0.0.1",port);
  vpRequestImage reqImage(&I);
  while(1)
  {
    double t = vpTime::measureTimeMs();
    // Acquire a new image
    g.acquire(I);
    vpDisplay::display(I);
    vpDisplay::flush(I);
    client.sendAndEncodeRequest(reqImage);
    // A click in the viewer to exit
    if ( vpDisplay::getClick(I, false) )
      break;
  }
  return 0;
#endif
}

See also: vpClient; vpRequest; vpNetwork

Examples:: testClient.cpp.

Definition at line 167 of file vpClient.h.

Constructor & Destructor Documentation

vpClient::vpClient ( )

Definition at line 44 of file vpClient.cpp.

vpClient::~vpClient ( )

virtual

Disconnect the client from all the servers, and close the sockets.

Definition at line 49 of file vpClient.cpp.

References stop().

Member Function Documentation

void vpNetwork::addDecodingRequest ( vpRequest * req )

inherited

Add a decoding request to the emitter. This request will be used to decode the received messages. Each request must have a different id.

Warning: vpRequest is a virtual pure class. It has to be implemented according to the way how you want to decode the message received.

See also: vpNetwork::removeDecodingRequest()

Parameters

req	: Request to add.

Definition at line 83 of file vpNetwork.cpp.

References vpRequest::getId(), and vpNetwork::request_list.

bool vpClient::connectToHostname	(	const std::string &	hostname,
		const unsigned int &	port_serv
	)

Connect to the server represented by the given hostname, and at a given port.

See also: vpClient::connectToIP();

Parameters

hostname	: Hostname of the server.
port_serv	: Port used for the connection.

Returns: True if the connection has been etablished, false otherwise.

Examples:: testClient.cpp.

Definition at line 62 of file vpClient.cpp.

References vpERROR_TRACE.

bool vpClient::connectToIP	(	const std::string &	ip,
		const unsigned int &	port_serv
	)

Connect to the server represented by the given ip, and at a given port.

See also: vpClient::connectToHostname()

Parameters

ip	: IP of the server.
port_serv	: Port used for the connection.

Returns: True if the connection has been etablished, false otherwise.

Definition at line 109 of file vpClient.cpp.

References vpERROR_TRACE.

void vpClient::deconnect ( const unsigned int & index = 0 )

Deconnect from the server at a specific index.

Parameters

index : Index of the server.

Definition at line 137 of file vpClient.cpp.

References vpNetwork::receptor_list.

unsigned int vpNetwork::getMaxSizeReceivedMessage ( )

inlineinherited

Get the maximum size that the emitter can receive (in request mode).

See also: vpNetwork::setMaxSizeReceivedMessage()

Returns: Acutal max size value.

Definition at line 190 of file vpNetwork.h.

unsigned int vpClient::getNumberOfAttempts ( )

inline

Get the actual number of attempts to connect to the server.

See also: vpClient::setNumberOfAttempts()

Returns: Actual number of attempts.

Definition at line 197 of file vpClient.h.

unsigned int vpClient::getNumberOfServers ( )

inline

Get the number of server that the client is connected on.

Returns: Number of servers.

Definition at line 204 of file vpClient.h.

References vpNetwork::print().

int vpNetwork::getReceptorIndex ( const char * name )

inherited

Get the receptor index from its name. The name can be either the IP, or its name on the network.

Parameters

name	: Name of the receptor.

Returns: Index of the receptor, or -1 if an error occurs.

Definition at line 138 of file vpNetwork.cpp.

References vpNetwork::receptor_list, and vpERROR_TRACE.

std::string vpNetwork::getRequestIdFromIndex ( const int & ind )

inlineinherited

Get the Id of the request at the index ind.

Parameters

ind	: Index of the request.

Returns: Id of the request.

Definition at line 176 of file vpNetwork.h.

void vpNetwork::print ( const char * id = "" )

inherited

Print the receptors.

Parameters

id	: Message to display before the receptor's index.

Definition at line 123 of file vpNetwork.cpp.

References vpNetwork::receptor_list.

Referenced by vpServer::getNumberOfClients(), getNumberOfServers(), print(), and vpServer::print().

void vpClient::print ( )

Print the servers.

Definition at line 168 of file vpClient.cpp.

References vpNetwork::print(), vpNetwork::receptor_list, vpERROR_TRACE, and vpTime::wait().

template<typename T >

int vpNetwork::receive	(	T *	object,
		const unsigned int &	sizeOfObject = `sizeof(T)`
	)

inherited

Receives a object. The size of the received object is suppose to be the size of the type of the object. Note that a received message can correspond to a deconnection signal.

Warning: Using this function means that you know what kind of object you are suppose to receive, and when you are suppose to receive. If the emitter has several receptors. It might be a problem, and in that case you better use the "request" option.

See also: vpNetwork::receiveRequest(); vpNetwork::receiveRequestOnce(); vpNetwork::receiveAndDecodeRequest(); vpNetwork::receiveAndDecodeRequestOnce()

Parameters

object	: Received object.
sizeOfObject	: Size of the received object.

Returns: the number of bytes received, or -1 if an error occured.

Examples:: testClient.cpp, and testServer.cpp.

Definition at line 280 of file vpNetwork.h.

References vpERROR_TRACE, and vpTRACE.

std::vector< int > vpNetwork::receiveAndDecodeRequest ( )

inherited

Receives and decode requests untils there is requests to receive.

Warning: Requests will be received but not decoded.

See also: vpNetwork::receive(); vpNetwork::receiveRequestFrom(); vpNetwork::receiveRequestOnce(); vpNetwork::receiveRequestOnceFrom(); vpNetwork::receiveAndDecodeRequest(); vpNetwork::receiveAndDecodeRequestFrom(); vpNetwork::receiveAndDecodeRequestOnce(); vpNetwork::receiveAndDecodeRequestOnceFrom()

Definition at line 375 of file vpNetwork.cpp.

References vpNetwork::receiveRequest(), and vpNetwork::request_list.

std::vector< int > vpNetwork::receiveAndDecodeRequestFrom ( const unsigned int & receptorEmitting )

inherited

Receives and decode requests, from a specific emitter, untils there is request to receive.

Warning: Requests will be received but not decoded.

See also: vpNetwork::receive(); vpNetwork::receiveRequest(); vpNetwork::receiveRequestOnce(); vpNetwork::receiveRequestOnceFrom(); vpNetwork::receiveAndDecodeRequest(); vpNetwork::receiveAndDecodeRequestFrom(); vpNetwork::receiveAndDecodeRequestOnce(); vpNetwork::receiveAndDecodeRequestOnceFrom()

Parameters

receptorEmitting : Index of the receptor emitting the message

Definition at line 402 of file vpNetwork.cpp.

References vpNetwork::receiveRequestFrom(), and vpNetwork::request_list.

int vpNetwork::receiveAndDecodeRequestOnce ( )

inherited

Receives a message once (in the limit of the Maximum message size value). This message can represent an entire request or not. Several calls to this function might be necessary to get the entire request. If it represents an entire request, it decodes the request.

Warning: Requests will be received but not decoded.

See also: vpNetwork::receive(); vpNetwork::receiveRequestFrom(); vpNetwork::receiveRequest(); vpNetwork::receiveRequestOnceFrom(); vpNetwork::receiveAndDecodeRequest(); vpNetwork::receiveAndDecodeRequestFrom(); vpNetwork::receiveAndDecodeRequestOnce(); vpNetwork::receiveAndDecodeRequestOnceFrom()

Returns: The number of bytes received, -1 if an error occured.

Definition at line 432 of file vpNetwork.cpp.

References vpNetwork::receiveRequestOnce(), and vpNetwork::request_list.

int vpNetwork::receiveAndDecodeRequestOnceFrom ( const unsigned int & receptorEmitting )

inherited

Receives a message once (in the limit of the Maximum message size value), from a specific emitter. This message can represent an entire request or not. Several calls to this function might be necessary to get the entire request. If it represents an entire request, it decodes the request.

Warning: Requests will be received but not decoded.

See also: vpNetwork::receive(); vpNetwork::receiveRequestFrom(); vpNetwork::receiveRequest(); vpNetwork::receiveRequestOnce(); vpNetwork::receiveAndDecodeRequest(); vpNetwork::receiveAndDecodeRequestFrom(); vpNetwork::receiveAndDecodeRequestOnce(); vpNetwork::receiveAndDecodeRequestOnceFrom()

Parameters

receptorEmitting : Index of the receptor emitting the message.

Returns: The number of bytes received, -1 if an error occured.

Definition at line 462 of file vpNetwork.cpp.

References vpNetwork::beginning, vpNetwork::currentMessageReceived, vpNetwork::end, vpNetwork::max_size_message, vpNetwork::param_sep, vpNetwork::readFileDescriptor, vpNetwork::receiveRequestOnceFrom(), vpNetwork::receptor_list, vpNetwork::request_list, vpNetwork::separator, vpNetwork::socketMax, vpNetwork::tv, vpNetwork::tv_sec, vpNetwork::tv_usec, vpNetwork::verboseMode, vpERROR_TRACE, and vpTRACE.

template<typename T >

int vpNetwork::receiveFrom	(	T *	object,
		const unsigned int &	receptorEmitting,
		const unsigned int &	sizeOfObject = `sizeof(T)`
	)

inherited

Receives a object from a receptor, by specifying its size or not. Note that a received message can correspond to a deconnection signal.

Warning: Using this function means that you know what kind of object you are suppose to receive, and when you are suppose to receive. If the emitter has several receptors. It might be a problem, and in that case you better use the "request" mode.

See also: vpNetwork::getReceptorIndex(); vpNetwork::receiveRequestFrom(); vpNetwork::receiveRequestOnceFrom(); vpNetwork::receiveAndDecodeRequestFrom(); vpNetwork::receiveAndDecodeRequestOnceFrom()

Parameters

object	: Received object.
receptorEmitting	: Index of the receptor emitting the message.
sizeOfObject	: Size of the received object.

Returns: the number of bytes received, or -1 if an error occured.

Definition at line 362 of file vpNetwork.h.

References vpERROR_TRACE, and vpTRACE.

std::vector< int > vpNetwork::receiveRequest ( )

inherited

Receive requests untils there is requests to receive.

Warning: Requests will be received but not decoded.

See also: vpNetwork::receive(); vpNetwork::receiveRequestFrom(); vpNetwork::receiveRequestOnce(); vpNetwork::receiveRequestOnceFrom(); vpNetwork::receiveAndDecodeRequest(); vpNetwork::receiveAndDecodeRequestFrom(); vpNetwork::receiveAndDecodeRequestOnce(); vpNetwork::receiveAndDecodeRequestOnceFrom()

Definition at line 281 of file vpNetwork.cpp.

Referenced by vpNetwork::receiveAndDecodeRequest().

std::vector< int > vpNetwork::receiveRequestFrom ( const unsigned int & receptorEmitting )

inherited

Receives requests, from a specific emitter, untils there is request to receive.

Warning: Requests will be received but not decoded.

See also: vpNetwork::receive(); vpNetwork::receiveRequest(); vpNetwork::receiveRequestOnce(); vpNetwork::receiveRequestOnceFrom(); vpNetwork::receiveAndDecodeRequest(); vpNetwork::receiveAndDecodeRequestFrom(); vpNetwork::receiveAndDecodeRequestOnce(); vpNetwork::receiveAndDecodeRequestOnceFrom()

Parameters

receptorEmitting : Index of the receptor emitting the message

Definition at line 304 of file vpNetwork.cpp.

Referenced by vpNetwork::receiveAndDecodeRequestFrom().

int vpNetwork::receiveRequestOnce ( )

inherited

Receives a message once (in the limit of the Maximum message size value). This message can represent an entire request or not. Several calls to this function might be necessary to get the entire request.

Warning: Requests will be received but not decoded.

See also: vpNetwork::receive(); vpNetwork::receiveRequestFrom(); vpNetwork::receiveRequest(); vpNetwork::receiveRequestOnceFrom(); vpNetwork::receiveAndDecodeRequest(); vpNetwork::receiveAndDecodeRequestFrom(); vpNetwork::receiveAndDecodeRequestOnce(); vpNetwork::receiveAndDecodeRequestOnceFrom()

Returns: The number of bytes received, -1 if an error occured.

Definition at line 328 of file vpNetwork.cpp.

Referenced by vpNetwork::receiveAndDecodeRequestOnce().

int vpNetwork::receiveRequestOnceFrom ( const unsigned int & receptorEmitting )

inherited

Receives a message once (in the limit of the Maximum message size value), from a specific emitter. This message can represent an entire request or not. Several calls to this function might be necessary to get the entire request.

Warning: Requests will be received but not decoded.

See also: vpNetwork::receive(); vpNetwork::receiveRequestFrom(); vpNetwork::receiveRequest(); vpNetwork::receiveRequestOnce(); vpNetwork::receiveAndDecodeRequest(); vpNetwork::receiveAndDecodeRequestFrom(); vpNetwork::receiveAndDecodeRequestOnce(); vpNetwork::receiveAndDecodeRequestOnceFrom()

Parameters

receptorEmitting : Index of the receptor emitting the message.

Returns: The number of bytes received, -1 if an error occured.

Definition at line 355 of file vpNetwork.cpp.

Referenced by vpNetwork::receiveAndDecodeRequestOnceFrom().

void vpNetwork::removeDecodingRequest ( const char * id )

inherited

Delete a decoding request from the emitter.

See also: vpNetwork::addDecodingRequest()

Parameters

id	: Id of the request to delete.

Definition at line 108 of file vpNetwork.cpp.

References vpNetwork::request_list.

template<typename T >

int vpNetwork::send	(	T *	object,
		const int unsigned &	sizeOfObject = `sizeof(T)`
	)

inherited

Examples:: testClient.cpp, and testServer.cpp.

template<typename T >

int vpNetwork::send	(	T *	object,
		const unsigned int &	sizeOfObject
	)

inherited

Send an object. The size of the received object is suppose to be the size of its type. Note that sending object containing pointers, virtual methods, etc, won't probably work.

Warning: Using this function means that, in the other side of the network, it knows what kind of object it is suppose to receive, and when it is suppose to receive. If the emitter has several receptors. It might be a problem, and in that case you better use the "request" option.

See also: vpNetwork::sendTo(); vpNetwork::sendRequest(); vpNetwork::sendRequestTo(); vpNetwork::sendAndEncodeRequest(); vpNetwork::sendAndEncodeRequestTo()

Parameters

object	: Received object.
sizeOfObject	: Size of the object

Returns: The number of bytes sent, or -1 if an error happened.

Definition at line 434 of file vpNetwork.h.

References vpTRACE.

int vpNetwork::sendAndEncodeRequest ( vpRequest & req )

inherited

Send and encode a request to the first receptor in the list.

See also: vpNetwork::sendRequestTo(); vpNetwork::sendAndEncodeRequest(); vpNetwork::sendAndEncodeRequestTo(); vpNetwork::send(); vpNetwork::sendTo()

Parameters

req	: Request to send.

Returns: The number of bytes that have been sent, -1 if an error occured.

Definition at line 241 of file vpNetwork.cpp.

References vpRequest::encode(), and vpNetwork::sendRequest().

int vpNetwork::sendAndEncodeRequestTo	(	vpRequest &	req,
		const unsigned int &	dest
	)

inherited

Send and encode a request to a specific receptor.

See also: vpNetwork::sendRequest(); vpNetwork::sendAndEncodeRequest(); vpNetwork::sendAndEncodeRequestTo(); vpNetwork::send(); vpNetwork::sendTo()

Parameters

req	: Request to send.
dest	: Index of the receptor receiving the request.

Returns: The number of bytes that have been sent, -1 if an error occured.

Definition at line 261 of file vpNetwork.cpp.

References vpRequest::encode(), and vpNetwork::sendRequestTo().

int vpNetwork::sendRequest ( vpRequest & req )

inherited

Send a request to the first receptor in the list.

See also: vpNetwork::sendRequestTo(); vpNetwork::sendAndEncodeRequest(); vpNetwork::sendAndEncodeRequestTo(); vpNetwork::send(); vpNetwork::sendTo()

Parameters

req	: Request to send.

Returns: The number of bytes that have been sent, -1 if an error occured.

Definition at line 173 of file vpNetwork.cpp.

References vpNetwork::sendRequestTo().

Referenced by vpNetwork::sendAndEncodeRequest().

int vpNetwork::sendRequestTo	(	vpRequest &	req,
		const unsigned int &	dest
	)

inherited

Send a request to a specific receptor.

See also: vpNetwork::sendRequest(); vpNetwork::sendAndEncodeRequest(); vpNetwork::sendAndEncodeRequestTo(); vpNetwork::send(); vpNetwork::sendTo()

Parameters

req	: Request to send.
dest	: Index of the receptor receiving the request.

Returns: The number of bytes that have been sent, -1 if an error occured.

Definition at line 189 of file vpNetwork.cpp.

References vpNetwork::beginning, vpNetwork::end, vpRequest::getId(), vpNetwork::param_sep, vpNetwork::receptor_list, vpNetwork::separator, vpRequest::size(), vpNetwork::verboseMode, and vpTRACE.

Referenced by vpNetwork::sendAndEncodeRequestTo(), and vpNetwork::sendRequest().

template<typename T >

int vpNetwork::sendTo	(	T *	object,
		const unsigned int &	dest,
		const unsigned int &	sizeOfObject = `sizeof(T)`
	)

inherited

Send an object. The size has to be specified.

Warning: Using this function means that, in the other side of the network, it knows what kind of object it is suppose to receive, and when it is suppose to receive. If the emitter has several receptors. It might be a problem, and in that case you better use the "request" option.