#ifdef _WIN32 
# define _WIN32_WINNT 0x0501 
#endif 
#include <boost/asio.hpp> 
#include <boost/array.hpp> 
#include <boost/filesystem.hpp> 
#include <string> 
#include <fstream> 
#include <sstream> 
#include <iostream> 

std::string filename; 
std::string file; 
boost::asio::io_service io_service; 
boost::asio::ip::tcp::endpoint endpoint(boost::asio::ip::tcp::v4(), 9999); 
boost::asio::ip::tcp::acceptor acceptor(io_service, endpoint); 
boost::asio::ip::tcp::socket sock(io_service); 
boost::array<char, 4096> buffer; 

void read_handler(const boost::system::error_code &ec, std::size_t bytes_transferred) 
{ 
	if (!ec || ec == boost::asio::error::eof) 
	{ 
		std::string data(buffer.data(), bytes_transferred); 
		if (filename.empty()) 
		{ 
			std::istringstream iss(data); 
			std::getline(iss, filename); 
			file = data; 
			file.erase(0, filename.size() + 1); 
			filename = boost::filesystem::path(filename).filename(); 
		} 
		else 
		{ 
			file += data; 
		} 

		if (!ec) 
			boost::asio::async_read(sock, boost::asio::buffer(buffer), read_handler); 
		else 
		{ 
			std::ofstream ofs(filename.c_str(), std::ios::out | std::ios::binary); 
			if (ofs) 
			{ 
				ofs << file; 
				std::cout << filename << " received" << std::endl; 
			} 
			else 
				std::cerr << filename << " couldn't be created" << std::endl; 
		} 
	} 
	else 
		std::cerr << "read_handler error: " << ec << std::endl; 
} 

void accept_handler(const boost::system::error_code &ec) 
{ 
	if (!ec) 
		boost::asio::async_read(sock, boost::asio::buffer(buffer), read_handler); 
	else 
		std::cerr << "accept_handler error: " << ec << std::endl; 
} 

int main() 
{ 
	boost::asio::ip::tcp::resolver::query query(boost::asio::ip::host_name(), "9999"); 
	boost::asio::ip::tcp::resolver resolver(io_service); 
	boost::asio::ip::tcp::resolver::iterator it = resolver.resolve(query); 
	boost::asio::ip::tcp::resolver::iterator end; 
	while (it != end) 
	{ 
		std::cout << it->endpoint().address() << std::endl; 
		++it; 
	} 

	acceptor.listen(); 
	acceptor.async_accept(sock, accept_handler); 
	io_service.run(); 
}