c++多客户端/服务器聊天

我正在考虑解决我与聊天服务器和客户端之间的问题。

应该怎么做，客户端请求用户名，然后为连接请求用户回答[Y/N]。

当点击是，客户端必须连接到服务器，当它需要去一个单独的线程(处理多个客户端)，但我的问题是，当多个用户加入(用户当前登录的用户名更改为最后一个谁加入了聊天。当这种情况发生时(服务器显示用户名，而在客户端屏幕上它消失，没有或所有奇怪的符号出现)。

我还需要帮助的是将消息分发到连接的其他客户端(不包括用户自己)

#include "stdafx.h"

long antwoord;
char chatname[100];
char bericht[498];
char sbericht[498];

using namespace std;
DWORD WINAPI SocketHandler(void*);
//our main function
void main()
{
    //here we set the Winsock-DLL to start
    WSAData wsaData;
    WORD DLLVERSION;
    DLLVERSION = MAKEWORD(2,1);
    //here the Winsock-DLL will be started with WSAStartup
    //version of the DLL
    antwoord = WSAStartup(DLLVERSION, &wsaData);
    if(antwoord != 0)
    {
        WSACleanup();
        exit(1);
    }
    else
    {
        cout << "WSA started successfully" <<endl;
        cout << "The status: n" << wsaData.szSystemStatus <<endl;
    }
    //the DLL is started
    //structure of our socket is being created
    SOCKADDR_IN addr; 
    //addr is our struct
    int addrlen = sizeof(addr);
    //socket sListen - will listen to incoming connections
    SOCKET sListen;
    //socket sConnect - will be operating if a connection is found.
    SOCKET sConnect;
    //setup of our sockets
    //opgezocht op internet - AF_INET bekend dat het lid is van de internet familie
    //Sock_STREAM  betekenend dat onze socket een verbinding georiënteerde socket is.
    sConnect = socket(AF_INET,SOCK_STREAM,NULL);
    //now we have setup our struct
    //inet_addr is our IP adres of our socket(it will be the localhost ip
    //that will be 127.0.0.1
    addr.sin_addr.s_addr = inet_addr("127.0.0.1");
    //retype of the family
    addr.sin_family = AF_INET;
    //now the server has the ip(127.0.0.1) 
    //and the port number (4444)
    addr.sin_port = htons(4444);
    //here we will define the setup for the sListen-socket
    sListen = socket(AF_INET,SOCK_STREAM,NULL);
    if (sConnect == INVALID_SOCKET)
    {
        cout << "Error at socket(): n" << WSAGetLastError() <<endl;
        WSACleanup();
    }
    else
    {
        cout << "Connect socket() is OK!" <<endl;
    }
    if(sListen == INVALID_SOCKET)
    {
        cout << "Error at socket(): n" << WSAGetLastError() <<endl;
        WSACleanup();
    }
    else
    {
        cout << "Listen socket() is OK!" <<endl;
    }
    //here the sListen-socket will be bind
    //we say that the socket has the IP adress of (127.0.0.1) and is on port (4444)
    //we let the socket become the struct "addr"
    if(bind(sListen, (SOCKADDR*)&addr, sizeof(addr)) == SOCKET_ERROR)
    {
        cout << "bind() failed: n" << WSAGetLastError() <<endl;
        WSACleanup();
        exit(1);
    }
    else{
        cout << "bind() is OK!" <<endl;
    }
    if(listen( sListen, 10) == -1 ){
        cout << "Error listening %dn" << WSAGetLastError() <<endl;
    }
    //here we will tell what the server must do when a connection is found
    //therefor we will create an endless loop
    cout << "Waiting for a incoming connection..." <<endl;

    //now we let the socket listen for incoming connections
    //SOMAXCOMM heeft het nut dat het dan voordurend luisterd naar inkomende verbindingen zonder limiet
    int* csock;
    while(true)
    {
        csock = (int*)malloc(sizeof(int));
        //if a connection is found: show the message!
        if((*csock = accept(sListen, (SOCKADDR*)&addr, &addrlen))!= INVALID_SOCKET)
        {
            cout << "A Connection was found with :" << inet_ntoa(addr.sin_addr) <<endl;
            antwoord = send(*csock, "Welcome to our chat:", 21,NULL);
            CreateThread(0,0,&SocketHandler, (void*)csock , 0,0);
            cout << *csock <<endl;
        }
    }
}
//sbericht is the message
DWORD WINAPI SocketHandler(void* lp)
{
    int *csock = (int*)lp;
    for(;;)
    {
        antwoord = recv(*csock, sbericht, sizeof(sbericht), NULL);
        antwoord = recv(*csock, chatname, sizeof(chatname), NULL);
        while(antwoord = recv(*csock, sbericht, sizeof(sbericht), NULL) && (antwoord = recv(*csock, sbericht, sizeof(sbericht), NULL)) )
        {
            printf("%s: "%s"n", chatname,  sbericht);
            antwoord = send(*csock, sbericht, sizeof(sbericht), NULL);
            antwoord = send(*csock, chatname, sizeof(chatname), NULL);
        }
        return 0;

    }
}

#include "stdafx.h"
using namespace std;
//our main function
int main()
{
    //here we set the Winsock-DLL to start
    string bevestiging; 
    char chatname[100]; 
    char bericht[250];
    char sbericht[250];
    string strbericht;
    string strsbericht;
    long antwoord;
    //here the Winsock-DLL will be started with WSAStartup
                    //version of the DLL
    WSAData wsaData;
    WORD DLLVERSION;
    DLLVERSION = MAKEWORD(2,1);
    antwoord = WSAStartup(DLLVERSION, &wsaData);
    if(antwoord != 0)
    {
        exit(1);
    }
    else
    {
        cout << "WSA started successfully" <<endl;
        cout << "The status: n" << wsaData.szSystemStatus <<endl;
    }
    SOCKADDR_IN addr;
    int addrlen = sizeof(addr);
    SOCKET sConnect;
    sConnect = socket(AF_INET, SOCK_STREAM, NULL);
    if (sConnect == INVALID_SOCKET)
    {
        cout << "Error at socket(): n" << WSAGetLastError() <<endl;
    }
    else
    {
        cout << "socket() is OK!n" <<endl;
    }

    addr.sin_addr.s_addr = inet_addr("127.0.0.1");
    addr.sin_family = AF_INET;
    addr.sin_port = htons(4444);
    cout << "What is your chat name?" <<endl;
    cin.getline(chatname, 100);

    cout << "Do you want to connect to the server? [Y/N]" <<endl;
    cin >> bevestiging;

    if (bevestiging == "N")
    {
        exit(1);
    }
    else
    {
        if(bevestiging == "Y")
        {
            connect(sConnect, (SOCKADDR*)&addr, sizeof(addr));
            antwoord = recv(sConnect, bericht, sizeof(bericht), NULL);
            strbericht = bericht;
            cout << strbericht << chatname <<endl;
            while(true)
            {
                if(antwoord > 1)
                {
                    cin.clear();
                    cin.sync();
                    cout << chatname << " :" <<endl;
                    cin.getline(sbericht, sizeof(sbericht));
                    antwoord = send(sConnect, sbericht, sizeof(sbericht), NULL);
                    antwoord = send(sConnect, chatname, sizeof(chatname), NULL);
                    while(antwoord = send(sConnect, sbericht, sizeof(sbericht), NULL) && (antwoord = send(sConnect, sbericht, sizeof(sbericht), NULL)))
                    {
                        antwoord = recv(sConnect, sbericht, sizeof(sbericht), NULL);
                        antwoord = recv(sConnect, chatname, sizeof(chatname), NULL);
                        cout << chatname << ":" <<endl;
                        cout << sbericht <<endl;
                        cin.getline(sbericht, 250);
                    }
                }
                else
                {
                cout << "The connection to the server has been lost... n" << "please exit the client." <<endl;
                }
            }

对不起，如果我没有写好(我只是学习编程套接字)，但我不能弄清楚这一点。所以不要对我太苛刻，我仍然需要学习，但我找不到我需要的东西。所以我想如果有人能告诉我怎么做，我就能明白它是怎么做的以及为什么。

总要学点东西(我现在也在忙beejee的网络编程教程)