stop receiving unknown number of packets in UDP server

#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN
#endif

#include "iostream"
#include "conio.h"
#include "windows.h"
#include "winsock2.h"
#include "string"

#pragma comment(lib, "Ws2_32.lib")

using namespace std;

int main()
{
    WSAData wsaData;
    WORD DllVersion = MAKEWORD(2,2);
    int startup_RetVal = WSAStartup(DllVersion, &wsaData);
    SOCKET sSocket = socket (AF_INET, SOCK_DGRAM, IPPROTO_UDP);
    SOCKADDR_IN addr;
    addr.sin_addr.s_addr = inet_addr("127.0.0.1");
    addr.sin_family = AF_INET;
    addr.sin_port = htons(2222);
    bind(sSocket,(SOCKADDR*)&addr, sizeof(addr));
    char buf[400] = {0};
    while (recvfrom(sSocket, buf, 400, NULL, NULL, NULL) > 0)
    {
	cout << buf;
    }
    cout << "end";
    _getch();
    return 0;
}