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Network Development Kit 2.0

, 29 Dec 2006
Network Development Kit is a set of simple classes for a client-server architecture.
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ChatClient
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ChatClient.ico
NDK
ChatServer
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ChatServer.ico
NDK
ChatClient.exe
ChatServer.exe
ndk_dll_demo.zip
NDK_dll_demo
ChatClient.exe
ChatServer.exe
NDK.dll
ChatClient
res
ChatClient.ico
ChatServer
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ChatServer.ico
NDK
NDK.def
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ndk_dll_src.zip
NDK_dll_src
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NDK.def
mssccprj.scc
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ndk_src.zip
NDK_src
////////////////////////////////////////////////////////////////////////////////
//                                                                            //
// NDK 2.0 - Network Development Kit                                          //
//                                                                            //
// Authors: Sebastien Lachance                                                //
//                                                                            //
// E-mail:  netblitz@rocler.qc.ca                                             //
//                                                                            //
// -------------------------------------------------------------------------- //
//                                                                            //
// Permission to use, copy, modify, and distribute this software for any      //
// purpose and without fee is hereby granted. This is no guarantee about the  //
// use of this software. For any comments, bugs or thanks, please email us.   //
//                                                                            //
// -------------------------------------------------------------------------- //
//                                                                            //
// Targeted Platform: Any Windows version                                     //
//                                                                            //
// Last modification: January 2002                                            //
//                                                                            //
// History:                                                                   //
//                                                                            //
// 1- First release of this file.                                             //
// 2- The class is renamed and some optimizations are applied. Hungarian      //
//    notation is used.                                                       //
//                                                                            //
////////////////////////////////////////////////////////////////////////////////

////////////////////////////////////////////////////////////////////////////////
// Includes                                                                   //
////////////////////////////////////////////////////////////////////////////////
#include "stdafx.h"
#include "NDKUserManager.h"
#include "NDKServer.h"


////////////////////////////////////////////////////////////////////////////////
// Constructors / Destructor                                                  //
////////////////////////////////////////////////////////////////////////////////

// Constructor.
CNDKUserManager::CNDKUserManager()
{
	m_lNextId = 0;
}


// Destructor.
CNDKUserManager::~CNDKUserManager()
{
	RemoveAllUsers();
}


////////////////////////////////////////////////////////////////////////////////
// Attributes                                                                 //
////////////////////////////////////////////////////////////////////////////////

// Gets the number of users.
long CNDKUserManager::GetNbUsers() const
{
	return (long)m_users.GetSize();
}


// Returns the Ids of all users.
void CNDKUserManager::GetUserIds(CLongArray& alIds) const
{
	alIds.RemoveAll();

	POSITION pos = m_users.GetHeadPosition();

	while (pos != NULL)
	{
		const CNDKUser& user = m_users.GetNext(pos);
		alIds.Add(user.GetId());
	}
}


////////////////////////////////////////////////////////////////////////////////
// Operations                                                                 //
////////////////////////////////////////////////////////////////////////////////

// Adds a user then returns its new Id.
long CNDKUserManager::AddUser(CNDKServerSocket* pServerSocket)
{
	m_lNextId++;

	m_users.AddTail(CNDKUser(m_lNextId, pServerSocket));
	
	return m_lNextId;
}


// Removes a user.
BOOL CNDKUserManager::RemoveUser(long lUserId)
{
	BOOL bResult = FALSE;

	CNDKUser& user = GetUserFromId(lUserId);

	if (user.GetId() > 0)
	{
		POSITION pos = m_users.Find(user);

		if (pos != NULL)
		{
			user.CloseSocket();
			m_users.RemoveAt(pos);
			bResult = TRUE;
		}
	}

	return bResult;
}


// Removes all users.
void CNDKUserManager::RemoveAllUsers()
{
	POSITION pos = m_users.GetHeadPosition();

	while (pos != NULL)
	{
		CNDKUser& user = m_users.GetNext(pos);
		user.CloseSocket();
	}

	m_users.RemoveAll();
}


// Sends a message to a specified user.
BOOL CNDKUserManager::SendMessage(long lUserId, CNDKMessage &msg)
{
	BOOL      bResult = FALSE;
	CNDKUser& user = GetUserFromId(lUserId);

	if (user.GetId() > 0)
	{	
		bResult = user.SendMessage(msg);

		if (!bResult)
			RemoveUser(user.GetId());
	}

	return bResult;
}


// Sends a message to all users.
BOOL CNDKUserManager::SendMessageToAllUsers(CNDKMessage& message, CLongList& listIds)
{
	POSITION pos = m_users.GetHeadPosition();

	while (pos != NULL)
	{
		CNDKUser& user = m_users.GetNext(pos);
		
		if (!user.SendMessage(message))
			listIds.AddTail(user.GetId());
	}

	BOOL bResult = listIds.IsEmpty();

	pos = listIds.GetHeadPosition();
	
	while (pos != NULL)
		RemoveUser(listIds.GetNext(pos));

	return bResult;
}


// Sends a message to all users except for user specified in alUserIds.
BOOL CNDKUserManager::SendMessageToAllUsersExceptFor(const CLongArray& alUserIds, 
													 CNDKMessage& message, 
													 CLongList& listIds)
{
	POSITION pos = m_users.GetHeadPosition();

	while (pos != NULL)
	{
		CNDKUser& user = m_users.GetNext(pos);

		BOOL bFound = FALSE;

		for (long lUserIndex = 0; lUserIndex < alUserIds.GetSize(); lUserIndex++)
		{
			if (alUserIds[lUserIndex] == user.GetId())
			{
				bFound = TRUE;
				break;
			}
		}
		
		// Send the message only if the user isn't in the array of exception
		if (!bFound && !user.SendMessage(message))
			listIds.AddTail(user.GetId());
	}

	BOOL bResult = listIds.IsEmpty();

	pos = listIds.GetHeadPosition();
	
	while (pos != NULL)
		RemoveUser(listIds.GetNext(pos));

	return bResult;

}


// Processes pending read.
BOOL CNDKUserManager::ProcessPendingRead(CNDKServerSocket* pSocket, long lErrorCode, 
										  long& lUserId, CNDKMessageList& messages)
{
	BOOL      bResult = FALSE;
	CNDKUser& user = GetUserFromSocket(pSocket);

	lUserId = user.GetId();

	if ((lErrorCode == 0) && (lUserId > 0))
	{
		do
		{
			CNDKMessage message;
			bResult = user.ReadMessage(message);

			messages.AddTail(message);

			// m_users.Find(user) is needed to check if the user is still 
			// connected because if the OnMessage causes a disconnection of 
			// the user, we must stop the reading.
		} while (bResult && m_users.Find(user) && !user.IsSocketBufferEmpty());
	}

	return bResult;
}


////////////////////////////////////////////////////////////////////////////////
// Private Operations                                                         //
////////////////////////////////////////////////////////////////////////////////

// Gets a user from an Id.
CNDKUser CNDKUserManager::GetUserFromId(long lUserId) const
{
	CNDKUser user;
	POSITION pos = m_users.GetHeadPosition();
	
	while (pos != NULL)
	{
		user = m_users.GetNext(pos);

		if (user.GetId() == lUserId)
			pos = NULL;
	}

	return user;
}


// Gets a user from a socket.
CNDKUser CNDKUserManager::GetUserFromSocket(CNDKServerSocket* pServerSocket) const
{
	CNDKUser user;
	POSITION pos = m_users.GetHeadPosition();

	while (pos != NULL)
	{
		user = m_users.GetNext(pos);

		if (user.IsSocketEqual(pServerSocket))
			pos = NULL;
	}

	return user;
}

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This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

About the Author

ArchieCoder
Software Developer (Senior) Mirego
Canada Canada
My name is Sébastien Lachance.
 
I love C# developing Windows Phone and Windows 8 applications.
 
When I’m not in front of a computer, my hobbies include playing bridge, poker and other card games, biking, reading technology news.
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