Winsock 2 C Test - Client

// Winsock32Client.cpp : Defines the entry point for the console application.
//

#define WIN32_LEAN_AND_MEAN
#include <Windows.h>
#include <WinSock2.h>
#include <ws2tcpip.h>
#include <iphlpapi.h>
#include <stdio.h>
#include <stdlib.h>
#include <tchar.h>

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

#define DEFAULT_PORT "27015"
#define BUFSIZE 1024

int _tmain(int argc, _TCHAR* argv[])
{
    WSADATA wsaData;
    int iResult;
    TCHAR buf[BUFSIZE];
    sockaddr_in remaddr;
    socklen_t addrlen = sizeof(remaddr);
    int recvlen;

    iResult = WSAStartup(MAKEWORD(2, 2), &wsaData);
    if (iResult != 0){
        printf("WSAStartup failed: %d\n", iResult);
        return 1;
    }

    struct addrinfo *result = NULL, *ptr = NULL, hints;

    ZeroMemory(&hints, sizeof(hints));
    hints.ai_family = AF_INET;
    hints.ai_socktype = SOCK_DGRAM;
    hints.ai_protocol = IPPROTO_UDP;
    hints.ai_flags = AI_PASSIVE;

    iResult = getaddrinfo("127.0.0.1", DEFAULT_PORT, &hints, &result);
    if (iResult != 0) {
        printf("getaddrinfo failed: %d\n", iResult);
        WSACleanup();
        return 1;
    }

    SOCKET ListenSocket = INVALID_SOCKET;
    ListenSocket = socket(result->ai_family, result->ai_socktype, result->ai_protocol);

    if (ListenSocket == INVALID_SOCKET)
    {
        printf("Error at socket(): %ld\n", WSAGetLastError());
        freeaddrinfo(result);
        WSACleanup();
        return 1;
    }


    TCHAR test[] = "END";
    int sendlen = sendto(ListenSocket, test, strlen(test), 0, result->ai_addr, result->ai_addrlen);
    printf("sent %d bytes\n", sendlen);
    if (sendlen < 0)
    {
        printf("send error: %d\n", WSAGetLastError());
    }

    recvlen = recvfrom(ListenSocket, buf, BUFSIZE, 0, (sockaddr *)&remaddr, &addrlen);
    printf("received %d bytes\n", recvlen);
    if (recvlen > 0){
    buf[recvlen] = 0;
    printf("received message: %s\n", buf);
    }

    system("PAUSE");
    freeaddrinfo(result);
    closesocket(ListenSocket);
    WSACleanup();
    return 0;
}