HEADER:

#ifndef _SERVER_
#define _SERVER_

#include <iostream>
#include <string>
#include <winsock.h>
using namespace std;

class Server
{
private:
	SOCKET s, c;
	int addr_len;
	struct sockaddr_in addr;
public:
	Server()
	{}; //Konstrukor
	~Server(){}; // Destruktor
	int SocketStart();

}; //SEMIKOLON NICHT VERGESSEN!!!

int Server::SocketStart()
{
    WSADATA wsa;
    if (WSAStartup(MAKEWORD(1, 1), &wsa))
    {
        printf("WSAStartup() failed, %lu\n", (unsigned long)GetLastError());
        return EXIT_FAILURE;
    }
	return 0;
		//SOCKET ANLEGEN
	s = socket(PF_INET, SOCK_STREAM, 0);
	if (s == -1)
	{
	  perror("socket() failed");
	  return 1;
	}
		//CONNECTEN
	addr.sin_addr.s_addr = INADDR_ANY;
	addr.sin_port = htons(7000);
	addr.sin_family = AF_INET;

	//BINDEN
	if (bind(s, (struct sockaddr*) &addr, sizeof(addr)) == -1)
	{
		perror("bind() failed");
		return 2;
	}

	//ZUHÖREN
	if (listen(s, 3) == -1)
	{
		perror("listen () failed");
		return 3;
	}

	//WARTEN
	for(;;)
    {
        addr_len = sizeof(addr);
        c = accept(s, (struct sockaddr*)&addr, &addr_len);
        if (c == -1)
        {
            perror("accept() failed");
            continue;
        }

        printf("Client from %s\n", inet_ntoa(addr.sin_addr));

        closesocket(c);
	}
	closesocket(s);
} 

#endif _SERVER_

CPP Datei:

#include "Klasse.h"
#define BUF_SIZ 4096

int main()
{
	Server a;
	a.SocketStart();
	char buffer[BUF_SIZ];

	return 0;
}

Guck mal Zeile 31 an...

Gelöst, danke! Nächstes mal debugge ichs -.- versprochen....