Server

#include <windows.h> //Required for socket init
#include <iostream>
using namespace std;

//server
int main()
{
SOCKET kSock;
SOCKET client;
int len;

char buf[256];
WSAData wsdata; //Declare WSAData
WORD wsver=MAKEWORD(2, 0); //We want Winsock 2.0
int nret=WSAStartup(wsver, &wsdata); //Pass version 2.0 and pointer to implement

		if(nret != 0)
		{ //Init failed
		/*A successful return value should be 0 */
		std::cout<<"Startup failed, error code: "<<WSAGetLastError(); //Returns error code
		WSACleanup(); //Cleanup Winsock library
		return -1;
		}

std::cout<<"Init success\n";
kSock=socket(AF_INET, SOCK_STREAM, 0);

		if(kSock == INVALID_SOCKET)
		{
		std::cout<<"Socket init failed";
		return -1;
		}

std::cout<<"Socket initialized\n";
sockaddr_in sin;
sin.sin_port=htons(12345);
sin.sin_addr.s_addr=INADDR_ANY;
sin.sin_family=AF_INET;

		if(bind(kSock,(sockaddr*)&sin, sizeof(sin)) == SOCKET_ERROR)
		{
		std::cout<<"Failed to bind\n";
		WSACleanup(); //Cleanup Winsock library
		return -1;
		}

std::cout<<"Bind successful!\n";
while (listen(kSock, SOMAXCONN) == SOCKET_ERROR); //Loop in order to constantly listen
/* set the number of connections to SOMAXCONN, in which case the provider chooses a reasonable value (5 in Windows XP
Professional) */

  len = sizeof(sin);
  client=accept(kSock, (sockaddr*)&sin, &len);

  std::cout<<"Connection established!\n";

  send(client, buf, sizeof(buf), 0); //Send "Hello"

  recv(kSock, buf, sizeof(buf), 0);
  std::cout <<"Client Antwortet: "<< buf;

  system("PAUSE");

closesocket(client); //Close both socket handles
closesocket(kSock);
WSACleanup();
return 0;
}

Client

#include <windows.h> //Required for socket init
#include <iostream>
using namespace std;

//client
int main()

{
char buf[256];
int nret;

SOCKET kSock;

WSAData wsdata; //Declare WSAData
WORD wsver=MAKEWORD(2, 0); //We want Winsock 2.0

nret=WSAStartup(wsver, &wsdata); //Pass version 2.0 and pointer to implement

		if(nret != 0)
		{ //Init failed
		/*A successful return value should be 0 */
		std::cout<<"Startup failed, error code: "<<WSAGetLastError(); //Returns error code
		WSACleanup(); //Cleanup Winsock library
		return -1;
		}

std::cout<<"Init success\n";
	 kSock=socket(AF_INET, SOCK_STREAM, 0);

		if(kSock == INVALID_SOCKET)
		{
		std::cout<<"Socket init failed";
		return -1;
		}

std::cout<<"Socket initialized\n";

sockaddr_in sin;
sin.sin_port=htons(12345); //Connect to port 80
sin.sin_addr.s_addr=inet_addr("127.0.0.1"); //Connect to localhost
sin.sin_family=AF_INET;

			if(connect(kSock,(sockaddr*)&sin, sizeof(sin)) == SOCKET_ERROR)
			{ //Check the condition
			std::cout<<"Connect failed, error: "<<WSAGetLastError(); //Returns error code
			WSACleanup(); //Cleanup the library
			return -1;
			}

std::cout<<"Connection successful!\n";
  cout<<"Befehl eingeben: ";
  cin>>buf;

  send(kSock, buf, sizeof(buf), 0);

recv(kSock, buf, sizeof(buf), 0); //Receive "Hello" from server
cout<<"Connect ausgabe: "<<connect;
std::cout <<"Server Antwortet: "<<buf;

system("PAUSE");

closesocket(kSock);
return 0;
}

Hat jemand eine Ahnung was da falsch ist?