Client 13 unresolved externals

Hallo,
ich habe folgenden source code aus der msdn abgeschrieben, kann mir wer sagen was 13 unresolved externals bedeutet?

server.cpp
-------------------------------------------------------------------------------

#include "stdafx.h"
#include "conio.h"
#include <winsock.h>

int _tmain(int argc, _TCHAR* argv[])
{
SOCKET server;
WORD version;
WSADATA hersteller;
version = MAKEWORD(1,1);
int i = 0;
i = WSAStartup(version,&hersteller);
if(i != NO_ERROR)
{
printf("Fehler WSAStartup %ld\n", WSAGetLastError());
}

sockaddr_in peer;
peer.sin_family = AF_INET;
peer.sin_port = htons(27015);
peer.sin_addr.s_addr = inet_addr("127.0.0.1");

server = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
bind(server,(SOCKADDR *)&peer, sizeof(peer));
listen(server,1);

SOCKET sockaccept;
printf("waiting for a client to connect\n");
    while (1) 
	{
    sockaccept = SOCKET_ERROR;
		while (sockaccept == SOCKET_ERROR) 
		{
        sockaccept = accept(server,NULL,NULL);
        }
        printf("client connected\n");
        server = sockaccept; 
        break;
    }

    int Sent;
    int Received = SOCKET_ERROR;
    char receivechar[20] = "";
	char ac[20] = "";
	int ab = 0;
	int lastpos = 0;
	int ad = 0;

    Received = recv(server, receivechar, 20, 0);
    printf("bytes received %ld\n", Received);

	for(int i = 0; i < strlen(receivechar); i++)
	{
		if(receivechar[i] == ';')
		{
		ac[0] = receivechar[i-1];
		ab += atoi(ac);
		ad++;
		}
		lastpos = i;
	}
	ac[0] = receivechar[lastpos];
	ab += atoi(ac);
	ab /= ad;
    itoa(ab,ac,10);
    Sent = send(server, ac, strlen(ac), 0);
    printf("bytes sent %ld\n", Sent);
	closesocket(server);
	closesocket(sockaccept);
	while(!kbhit())
	return 0;
}

client.cpp
-------------------------------------------------------------------------------

#include "stdafx.h"
#include "conio.h"
#include <winsock.h>

int _tmain(int argc, _TCHAR* argv[])
{
SOCKET client;
sockaddr_in peer;
peer.sin_family = AF_INET;
peer.sin_port = htons(27015);
peer.sin_addr.s_addr = inet_addr("127.0.0.1");
WSADATA hersteller;

WORD version;
version = MAKEWORD(1,1);
int i = 0;
i = WSAStartup(version, &hersteller);
if(i != NO_ERROR)
{
printf("Fehler WSAStartup %ld\n",WSAGetLastError());
}

client = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if(client == INVALID_SOCKET)
{
printf("Fehler socket %ld\n", WSAGetLastError());
WSACleanup();
return 1;
}

if(connect(client, (SOCKADDR *)&peer, sizeof(peer))== SOCKET_ERROR)
{
printf("Fehler connect %ld\n", WSAGetLastError());
WSACleanup();
return 1;
}

char sendchar[20] = "1;2;3;3;4;5;3;2"; 
char receivechar[20] = ""; 
int bytesent = 0;
int bytereceived = SOCKET_ERROR;
bytesent = send(client,sendchar,strlen(sendchar),0);
while(bytereceived == SOCKET_ERROR)
{
bytereceived = recv(client,receivechar,strlen(receivechar),0);
	/*if(bytereceived == 0 || bytereceived == WSAECONNRESET)
	{
	printf("connection closed\n");
	}
	if(bytereceived < 0)
	{
	return;
	}*/
	printf("bytes received %ld", bytereceived);

}
closesocket(client);
while(!kbhit())
return 0;
}

CMatt

was genau ist da unresolved?

------ Build started: Project: client, Configuration: Debug Win32 ------

Compiling...
server.cpp
c:\Dokumente und Einstellungen\TEMP\Desktop\client\client\server.cpp(52) : warning C4018: '<' : signed/unsigned mismatch
c:\Dokumente und Einstellungen\TEMP\Desktop\client\client\server.cpp(67) : warning C4267: 'argument' : conversion from 'size_t' to 'int', possible loss of data
Linking...
server.obj : error LNK2005: _main already defined in client.obj
client.obj : error LNK2019: unresolved external symbol _closesocket@4 referenced in function _main
server.obj : error LNK2019: unresolved external symbol _closesocket@4 referenced in function _main
client.obj : error LNK2019: unresolved external symbol _recv@16 referenced in function _main
server.obj : error LNK2019: unresolved external symbol _recv@16 referenced in function _main
client.obj : error LNK2019: unresolved external symbol _send@16 referenced in function _main
server.obj : error LNK2019: unresolved external symbol _send@16 referenced in function _main
client.obj : error LNK2019: unresolved external symbol _connect@12 referenced in function _main
client.obj : error LNK2019: unresolved external symbol _WSACleanup@0 referenced in function _main
client.obj : error LNK2019: unresolved external symbol _socket@12 referenced in function _main
server.obj : error LNK2019: unresolved external symbol _socket@12 referenced in function _main
client.obj : error LNK2019: unresolved external symbol _WSAGetLastError@0 referenced in function _main
server.obj : error LNK2001: unresolved external symbol _WSAGetLastError@0
client.obj : error LNK2019: unresolved external symbol _WSAStartup@8 referenced in function _main
server.obj : error LNK2001: unresolved external symbol _WSAStartup@8
client.obj : error LNK2019: unresolved external symbol _inet_addr@4 referenced in function _main
server.obj : error LNK2019: unresolved external symbol _inet_addr@4 referenced in function _main
client.obj : error LNK2019: unresolved external symbol _htons@4 referenced in function _main
server.obj : error LNK2001: unresolved external symbol _htons@4
server.obj : error LNK2019: unresolved external symbol _accept@12 referenced in function _main
server.obj : error LNK2019: unresolved external symbol _listen@8 referenced in function _main
server.obj : error LNK2019: unresolved external symbol _bind@12 referenced in function _main
Debug/client.exe : fatal error LNK1120: 13 unresolved externals

Build log was saved at "file://c:\Dokumente und Einstellungen\Temp\Desktop\client\client\Debug\BuildLog.htm"
client - 23 error(s), 2 warning(s)

---------------------- Done ----------------------

Build: 0 succeeded, 1 failed, 0 skipped

CMatt

Ws2_32.lib gelinkt?