vpRequest Class Reference

#include <vpRequest.h>

Public Member Functions
	vpRequest ()
virtual	~vpRequest ()
void	addParameter (char *params)
void	addParameter (std::string &params)
void	addParameter (std::vector< std::string > &listOfparams)
template<typename T >
void	addParameterObject (T *params, const int &sizeOfObject=sizeof(T))
virtual void	decode ()=0
void	clear ()
virtual void	encode ()=0
std::string &	operator[] (const unsigned int &i)
const std::string &	operator[] (const unsigned int &i) const
std::string	getId ()
void	setId (const char *id)
unsigned int	size ()

Protected Attributes
std::string	request_id
std::vector< std::string >	listOfParams

Detailed Description

This the request that will transit on the network.

Exemple request decoding an image on a specific form. First parameter : Height of the image. Second parameter : Width of the image. Thirs parameter : Bitmap of the image (not compress).

Here is the header of the vpRequestImage class.

#ifndef vpRequestImage_H
#define vpRequestImage_H

#include <visp/vpImage.h>
#include <visp/vpRequest.h>

class vpRequestImage : public vpRequest
{
private:
  vpImage<unsigned char> *I;
  
public:
  vpRequestImage();
  vpRequestImage(vpImage<unsigned char> *);
  ~vpRequestImage();
  
  virtual void encode();
  virtual void decode();
};

#endif

Here is the definition of the vpRequestImage class.

#include <vpRequestImage.h>

vpRequestImage::vpRequestImage(){
  request_id = "image";
}

vpRequestImage::vpRequestImage(vpImage<unsigned char> *Im){
  request_id = "image";
  I = Im;
}

vpRequestImage::~vpRequestImage(){}

void vpRequestImage::encode(){
  clear(); 
  
  unsigned int h = I->getHeight();
  unsigned int w = I->getWidth();     

  addParameterObject(&h);
  addParameterObject(&w);
  addParameterObject(I->bitmap,h*w*sizeof(unsigned char));
}
  
void vpRequestImage::decode(){
  if(listOfParams.size() == 3){
    unsigned int w, h;
    memcpy((void*)&h, (void*)listOfParams[0].c_str(), sizeof(unsigned int));
    memcpy((void*)&w, (void*)listOfParams[1].c_str(), sizeof(unsigned int));
    
    I->resize(h,w);
    memcpy((void*)I->bitmap,(void*)listOfParams[2].c_str(),w*h*sizeof(unsigned char));
  }
}

See also

vpClient

vpServer

vpNetwork

Definition at line 134 of file vpRequest.h.

Constructor & Destructor Documentation

vpRequest::vpRequest

(

)

Definition at line 44 of file vpRequest.cpp.

vpRequest::~vpRequest ( )

virtual

Definition at line 48 of file vpRequest.cpp.

Member Function Documentation

void vpRequest::addParameter

(

char *

params

)

Add a message as parameter of the request.

See also

vpNetwork::addParameterObject()

Parameters

params

: Array of characters representing the message to add.

Definition at line 58 of file vpRequest.cpp.

References listOfParams.

void vpRequest::addParameter

(

std::string &

params

)

Add a message as parameter of the request.

See also

vpNetwork::addParameterObject()

Parameters

params

: std::string representing the message to add.

Definition at line 71 of file vpRequest.cpp.

References listOfParams.

void vpRequest::addParameter

(

std::vector< std::string > &

listOfparams

)

Add messages as parameters of the request. Each message corresponds to one parameter.

See also

vpNetwork::addParameterObject()

Parameters

listOfparams

: Array of std::string representing the messages to add.

Definition at line 84 of file vpRequest.cpp.

template<typename T >

void vpRequest::addParameterObject	(	T *	params,
		const int &	sizeOfObject = sizeof(T)
	)

Add an object as parameter of the request.

Warning

Only simple object can be sent unless you know its size. Sending object containing pointers, virtual methods, etc, won't probably work. Unless the size is well defined...

See also

vpRequest::addParameter()

Parameters

params	: Object to add.
sizeOfObject	: Size of the object.

Definition at line 228 of file vpRequest.h.

void vpRequest::clear ( )

inline

Clear the parameters of the request.

Definition at line 160 of file vpRequest.h.

virtual void vpRequest::decode ( )

pure virtual

Decode the parameters of the request (Funtion that has to be redifined).

See also

vpRequest::encode()

virtual void vpRequest::encode ( )

pure virtual

Encode the parameters of the request (Funtion that has to be redifined).

See also

vpRequest::decode()

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

std::string vpRequest::getId ( )

inline

Get the ID of the request.

See also

vpRequest::setId()

Returns

ID of the request.

Definition at line 190 of file vpRequest.h.

Referenced by vpNetwork::addDecodingRequest(), and vpNetwork::sendRequestTo().

std::string& vpRequest::operator[] ( const unsigned int &  i )

inline

Accessor on the parameters.

Returns

Parameter at the index i.

Definition at line 174 of file vpRequest.h.

const std::string& vpRequest::operator[] ( const unsigned int &  i ) const

inline

Accessor on the parameters (const).

Returns

Parameter at the index i (const).

Definition at line 181 of file vpRequest.h.

void vpRequest::setId ( const char *  id )

inline

Change the ID of the request.

See also

vpRequest::getId()

Parameters

id

: new ID.

Definition at line 199 of file vpRequest.h.

unsigned int vpRequest::size ( )

inline

Get the number of parameters.

Returns

Number of parameters.

Definition at line 206 of file vpRequest.h.

Referenced by vpNetwork::sendRequestTo().

Member Data Documentation

std::vector<std::string> vpRequest::listOfParams

protected

Definition at line 138 of file vpRequest.h.

Referenced by addParameter().

std::string vpRequest::request_id

protected

Definition at line 137 of file vpRequest.h.