Teszt

#pragma comment(lib, "ws2_32.lib")
#include <winsock2.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>


#define DEFAULT_PORT 1234




int main(int argc, char **argv)
{
    char Buffer[128];
    char *server_name= "127.0.0.1";
    unsigned short port = 1234;
    int retval, loopflag = 0;
    int i, loopcount, maxloop=-1;
    unsigned int addr;
    struct sockaddr_in server;
    struct hostent *hp;
    WSADATA wsaData;
    SOCKET  conn_socket;



    if ((retval = WSAStartup(0x202, &wsaData)) != 0)
    {
        fprintf(stderr,"Client: WSAStartup() failed with error %d\n", retval);
        WSACleanup();
        getchar();
        return -1;
    }
    else
    {
        printf("Client: WSAStartup() is OK.\n");
    }



    addr = inet_addr(server_name);
    hp = gethostbyaddr((char *)&addr, 4, AF_INET);



    if (hp == NULL )
    {
        fprintf(stderr,"Client: Cannot resolve address \"%s\": Error %d\n", server_name, WSAGetLastError());
        WSACleanup();
        exit(1);
    }
    else
        printf("Client: gethostbyaddr() is OK.\n");
    memset(&server, 0, sizeof(server));
    memcpy(&(server.sin_addr), hp->h_addr, hp->h_length);
    server.sin_family = hp->h_addrtype;
    server.sin_port = htons(port);

    conn_socket = socket(AF_INET, SOCK_STREAM, 0);
    if (conn_socket <0 )
    {
        fprintf(stderr,"Client: Error Opening socket: Error %d\n", WSAGetLastError());
        WSACleanup();
        getchar();
        return -1;
    }
    else
    {
        printf("Client: socket() is OK.\n");
    }


    printf("Client: Client connecting to: %s.\n", hp->h_name);
    if (connect(conn_socket, (struct sockaddr*)&server, sizeof(server)) == SOCKET_ERROR)
    {
        fprintf(stderr,"Client: connect() failed: %d\n", WSAGetLastError());
        WSACleanup();
        return -1;
    }
    else
        printf("Client: connect() is OK.\n");





    ;

        retval = recv(conn_socket, Buffer, sizeof(Buffer), 0);
        if (retval == SOCKET_ERROR)
        {
            fprintf(stderr,"Client: recv() failed: error %d.\n", WSAGetLastError());
            closesocket(conn_socket);
            WSACleanup();
            return -1;
        }
        else
            printf("Client: recv() is OK.\n");

        // We are not likely to see this with UDP, since there is no
        // 'connection' established.
        if (retval == 0)
        {
            printf("Client: Server closed connection.\n");
            closesocket(conn_socket);
            WSACleanup();
            return -1;
        }

        printf("Client: Received %d bytes, data \"%s\" from server.\n", retval, Buffer);


        closesocket(conn_socket);
        WSACleanup();
        getchar();
        return 0;
    }