learning c++ network programming

#ifndef NETWORKHELPER_H#define NETWORKHELPER_H#include <winsock2.h>#include <string>// Winsock startup and shutdown functionsbool  StartWinSock();  // Sets up WinSockbool  StopWinSock();   // Shutdown WinSockbool SetupServerForListening(SOCKET& socket_fd, struct sockaddr_in* sockAddr);  // sets up a socket for the server to listen for connectionsbool ConnectTo(SOCKET& socket_fd, struct sockaddr_in* sockAddr);                // sets up a connection and returns the socket // Setup the sockaddr_in struct using appropriate argumentsbool SetupSockAddrInStruct(const unsigned short port, const char* const address, struct sockaddr_in& sockAddr);// Sending Functionsbool SendInt(const int toSend, SOCKET to);                    // Send an int (handles host to net order)bool SendBytes(const char* const toSend, int num, SOCKET to); // Send num bytes from an array bool SendString(const std::string toSend, SOCKET to);         // Send a string over a socket// Receiving Functionsbool RecvInt(int& toRecv, SOCKET from);                       // Receive an int (handles net to host order)int  RecvBytes(char* const toRecv, int num, SOCKET from);     // Receives num of bytes and stores in char arraybool RecvString(std::string& toRecv, SOCKET from);                 // Receives a string over a socket#endif

#ifndef SAS_NETWORK_H#define SAS_NETWORK_H#ifdef WIN32	#include <winsock2.h>#else	typedef int SOCKET;#endifnamespace sas{	// network base class	class sasNetwork	{	public:		sasNetwork();		virtual ~sasNetwork();		// Setup and shutdown functions... abstract so derived must implement these		virtual bool Setup(unsigned short port, const char* const connectTo = NULL) = 0;		virtual short CheckSocket() = 0;           // uses the select function to poll the socket(s) to see if ready		virtual bool Shutdown() = 0;		// base class will take care of these		short NetSndLong(long number);                            // send an int		short NetRcvLong(long& number);							 // receive an int		short NetSndShort(short number);		short NetRcvShort(short& number);		short NetSndNumBytes(const char* bytes, long num);		short NetRcvNumBytes(char* const bytes, long num);		static bool GetLocalIP();	protected:		bool SetupSockAddrInStruct(unsigned short port, const char* address, struct sockaddr_in& sockAddr);		fd_set m_AllFD;		fd_set m_ReadFD;		int    m_MaxFD;		bool   m_Connected;                       // is there an active connection		SOCKET m_CommSock;                        // main socket file descriptor... server 												  //   will have a listen socket as well	};	// Server class	class sasServer : public sasNetwork	{	public:		sasServer();           // constructor		~sasServer();          // deconstructor		bool Setup(unsigned short port, const char* const connectTo = NULL);  // set up server to listen on a certain port																        //   the connectTo should always be null		short CheckSocket();		bool Shutdown();                                                // shutdown server	protected:		bool AcceptClient();		SOCKET m_ListenSocket;                   // server listening for connections on this socket	};	// Client class	class sasClient : public sasNetwork	{	public:		sasClient();     // constructor		~sasClient();    // deconstructor		bool Setup(unsigned short port, const char* const serverName);         // connect to a server		short CheckSocket();		bool Shutdown();                                                 // shutdown the client	};}#endif