campo-sirio/libraries/curlpp/examples/example01.cpp

/*
 *    Copyright (c) <2002-2005> <Jean-Philippe Barrette-LaPierre>
 *    
 *    Permission is hereby granted, free of charge, to any person obtaining
 *    a copy of this software and associated documentation files 
 *    (curlpp), to deal in the Software without restriction, 
 *    including without limitation the rights to use, copy, modify, merge,
 *    publish, distribute, sublicense, and/or sell copies of the Software,
 *    and to permit persons to whom the Software is furnished to do so, 
 *    subject to the following conditions:
 *    
 *    The above copyright notice and this permission notice shall be included
 *    in all copies or substantial portions of the Software.
 *    
 *    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 *    OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 *    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 
 *    IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY 
 *    CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, 
 *    TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 *    SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

/**
* \file
* Setting and copying options.
* 
*/


#include <string>
#include <sstream>
#include <iostream>

#include <curlpp/cURLpp.hpp>
#include <curlpp/Easy.hpp>
#include <curlpp/Options.hpp>


namespace
{
const long MyPort = 80;
}

/** 
 * This example is made to show you how you can use the Options.
 */
int main(int, char **)
{
	try
	{
		curlpp::Cleanup myCleanup;

		// First easy example.
		{
		  // The first easiest example is to retreive the content of
		  // a web page and put it in a stream.
		  std::cout << curlpp::options::Url("http://example.com");

		  // You don't need to use just the standard outputs. You
		  // can use any stream:
		  std::ostringstream os;
		  os << curlpp::options::Url("http://example.com");
		}

		// More elaborate example.
		{
		  // What the previous example done there was simply 
		  // to create a curlpp::Easy class, which is the basic
		  // object in cURLpp, and then set the Url option.
		  // curlpp::options classes are the primitives that allow to specify 
		  // values to the requests. 
		  curlpp::options::Url myUrl(std::string("http://example.com"));
		  curlpp::Easy myRequest;
		  myRequest.setOpt(myUrl);

		  // Now that all the options we wanted to set are there, we need to
		  // actually do the request. the "perform" method does actually that.
		  // With that call, the request will be done and the content of that URL
		  // will be printed in std::cout (which is the default).
		  myRequest.perform();

		  // If we wanted to put the content of the URL within a string stream
		  // (or any type of std::ostream, for that matter), like the first example, 
		  // we would use the WriteStrem option like this:
		  std::ostringstream os;
		  curlpp::options::WriteStream ws(&os);
		  myRequest.setOpt(ws);
		  myRequest.perform();

		  // There is some shorcut within curlpp that allow you to write shorter code
		  // like this:
		  os << myRequest;

		  // That would do exactly what the previous code was doing.
		}

		// Creation of the URL option.
		curlpp::options::Url myUrl(std::string("http://example.com"));

		// Copy construct from the other URL.
		curlpp::options::Url myUrl2(myUrl);

		// Creation of the port option.
		curlpp::options::Port myPort(MyPort);

		// Creation of the request.
		curlpp::Easy myRequest;

		// Creation of an option that contain a copy of the URL option.
		curlpp::OptionBase *mytest = myUrl.clone();
		myRequest.setOpt(*mytest);

		// You can reuse the base option for other type of option
		// and set the option to the request. but first, don't forget 
		// to delete the previous memory. You can delete it since the 
		// option is internally duplicated for the request.
		delete mytest;
		mytest = myPort.clone();
		myRequest.setOpt(*mytest);
		delete mytest;

		// You can clone an option directly to the same type of 
		// option.
		curlpp::options::Url *myUrl3 = myUrl.clone();
		myRequest.setOpt(myUrl3);
		// Now myUrl3 is owned by the request we will NOT use 
		// it anymore.


		// You don't need to declare an option if you just want 
		// to use it once.
		myRequest.setOpt(curlpp::options::Url("example.com"));


		// Note that the previous line wasn't really efficient
		// because we create the option, this option is duplicated
		// for the request and then the option destructor is called.
		// You can use this instead:
		myRequest.setOpt(new curlpp::options::Url("example.com"));
		// Note that with this the request will use directly this
		// instance we just created. Be aware that if you pass an
		// Option pointer to the setOpt function, it will consider
		// the instance has its own instance. The Option instance
		// will be deleted when the request will be deleted, so
		// don't use the instance further in your code.


		// Doing the previous line is efficient as this:
		myRequest.setOpt(myUrl.clone());


		// You can retreive the value of a specific option.
		std::cout << myUrl2.getValue() << std::endl;

		// Perform the transaction with the options set.
		myRequest.perform();
	}

	catch( curlpp::RuntimeError &e )
	{
		std::cout << e.what() << std::endl;
	}

	catch( curlpp::LogicError &e )
	{
		std::cout << e.what() << std::endl;
	}
    
  return 0;
}