#include <visp3/core/vpServer.h>

Inheritance diagram for vpServer:

Public Member Functions
	vpServer ()

	vpServer (const int &port)

	vpServer (const std::string &adress_serv, const int &port_serv)

virtual	~vpServer ()

bool	checkForConnections ()

bool	isStarted ()

unsigned int	getMaxNumberOfClients ()

unsigned int	getNumberOfClients ()

void	print ()

bool	start ()

void	setMaxNumberOfClients (unsigned int &l)

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) server.

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

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

#include <visp3/core/vpServer.h>
#include <iostream>
int main(int argc,const char** argv)
{
  int port = 35000;
  vpServer serv(port); //Launch the server on localhost
  serv.start();
  
  bool run = true;
  int val;
   
  while(run){
    serv.checkForConnections();
    
    if(serv.getNumberOfClients() > 0)
    {
      if(serv.receive(&val) != sizeof(int)) //Receiving a value from the first client
         std::cout << "Error while receiving" << std::endl;
      else
        std::cout << "Received : " << val << std::endl;
      
      val = val+1;
      if(serv.send(&val) != sizeof(int)) //Sending the new value to the first client
        std::cout << "Error while sending" << std::endl;
      else
        std::cout << "Sending : " << val << std::endl;
    }
  }
  
  return 0;
}

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

#include <visp3/core/vpServer.h>
#include <visp3/gui/vpDisplayX.h>
#include <visp3/gui/vpDisplayGDI.h>
#include "vpRequestImage.h" //See vpRequest class documentation
int main(int argc,const char** argv)
{
  int port = 35000;
  
  std::cout << "Port: " << port << std::endl;
  vpServer serv(port);
  serv.start();
#if defined(VISP_HAVE_X11)
  vpDisplayX display;
#elif defined(VISP_HAVE_GDI) //Win32
  vpDisplayGDI display;
#endif
  vpImage<unsigned char> I;
  
  vpRequestImage reqImage(&I);
  serv.addDecodingRequest(&reqImage);
  
  bool run = true;
   
  while(run){
    serv.checkForConnections();
    
    if(serv.getNumberOfClients() > 0)
    {
      int index = serv.receiveAndDecodeRequestOnce();
      std::string id = serv.getRequestIdFromIndex(index);
        
      if(id == reqImage.getId())
      {
#if defined(VISP_HAVE_X11) || defined(VISP_HAVE_GDI)
        if (! display.isInitialised() )
          display.init(I, -1, -1, "Remote display");
#endif
        
        vpDisplay::display(I) ;
        vpDisplay::flush(I);
        // A click in the viewer to exit
        if ( vpDisplay::getClick(I, false) )
          run = false;
      }
    }
  }
  
  return 0;
}

See also: vpClient; vpRequest; vpNetwork

Examples:: testServer.cpp.

Definition at line 160 of file vpServer.h.

Constructor & Destructor Documentation

vpServer::vpServer ( )

Construct a server on the machine launching it.

Definition at line 44 of file vpServer.cpp.

References vpNetwork::emitter, vpNetwork::vpEmitter::emitterAddress, vpNetwork::vpEmitter::socketFileDescriptorEmitter, and vpERROR_TRACE.

vpServer::vpServer ( const int & port_serv )

Construct a server on the machine launching it, with a specified port.

Parameters

port_serv : server's port.

Definition at line 69 of file vpServer.cpp.

References vpNetwork::emitter, vpNetwork::vpEmitter::emitterAddress, vpNetwork::vpEmitter::socketFileDescriptorEmitter, and vpERROR_TRACE.

vpServer::vpServer	(	const std::string &	adress_serv,
		const int &	port_serv
	)

Construct a server on the machine at a given adress, with a specified port.

Parameters

adress_serv	: server's adress.
port_serv	: server's port.

Definition at line 95 of file vpServer.cpp.

References vpNetwork::emitter, vpNetwork::vpEmitter::emitterAddress, vpNetwork::vpEmitter::socketFileDescriptorEmitter, and vpERROR_TRACE.

vpServer::~vpServer ( )

virtual

Shutdown the server.

Definition at line 119 of file vpServer.cpp.

References vpNetwork::emitter, vpNetwork::receptor_list, and vpNetwork::vpEmitter::socketFileDescriptorEmitter.

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 77 of file vpNetwork.cpp.

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

bool vpServer::checkForConnections ( )

Check if a client has connected or deconnected the server

Returns: True if a client connected or deconnected, false otherwise OR server not started yet.

Examples:: testServer.cpp.

Definition at line 194 of file vpServer.cpp.

References vpNetwork::emitter, vpNetwork::readFileDescriptor, vpNetwork::receptor_list, vpNetwork::vpReceptor::receptorAddress, vpNetwork::vpReceptor::receptorAddressSize, vpNetwork::vpReceptor::receptorIP, vpNetwork::vpEmitter::socketFileDescriptorEmitter, vpNetwork::vpReceptor::socketFileDescriptorReceptor, vpNetwork::socketMax, start(), vpNetwork::tv, vpNetwork::tv_sec, vpNetwork::tv_usec, and vpERROR_TRACE.

unsigned int vpServer::getMaxNumberOfClients ( )

inline

Get the maximum number of clients that can be connected to the server.

See also: vpServer::setMaxNumberOfClients()

Returns: Maximum number of clients.

Definition at line 198 of file vpServer.h.

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 182 of file vpNetwork.h.

unsigned int vpServer::getNumberOfClients ( )

inline

Get the number of clients connected to the server.

Returns: Number of clients connected.

Examples:: testServer.cpp.

Definition at line 205 of file vpServer.h.

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 132 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 169 of file vpNetwork.h.

bool vpServer::isStarted ( )

inline

Check if the server is started.

See also: vpServer::start()

Returns: True if the server is started, false otherwise.

Definition at line 189 of file vpServer.h.

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

inherited

Print the receptors.

Parameters

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

Definition at line 117 of file vpNetwork.cpp.

References vpNetwork::receptor_list.

Referenced by vpClient::print(), and print().

void vpServer::print ( )

Print the connected clients.

Definition at line 277 of file vpServer.cpp.

References vpNetwork::print().

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 275 of file vpNetwork.h.

References vpNetwork::tv, vpNetwork::tv_sec, vpNetwork::tv_usec, 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 373 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 399 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 428 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 458 of file vpNetwork.cpp.

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

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 355 of file vpNetwork.h.

References vpNetwork::tv, vpNetwork::tv_sec, vpNetwork::tv_usec, 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 303 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 327 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 353 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 100 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 424 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 169 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 188 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.