程序代码：

#include "stdio.h"
#include "stdlib.h"
#include "Win/winsock2.h"
#include "me/me_net.c"

#define BUF_SEND 2048

void input_pchar (const char* cue, char* arg);
void input_pint (const char* cue, int* arg);

int main (void)
{
    WSADATA data;
    SOCKET sock;

    struct sockaddr_in that;

    char that_IP[16];
    int that_port;

    char buf_send[BUF_SEND] = {0};

    WSAStartup_check (0x0202, &data);
    sock = socket_check (AF_INET, SOCK_DGRAM, 0);

    that.sin_family = AF_INET;
    input_pint ("Ta's port: ", &that_port);
    that.sin_port = htons ((unsigned short)that_port);
    input_pchar ("Ta's IP: ", that_IP);
    that.sin_addr.s_addr = inet_addr (that_IP);

    while (1)
    {   
        input_pchar ("Send: ", buf_send);
        sendto_check (sock, buf_send, BUF_SEND, 0, (struct sockaddr*)&that, sizeof (that));
    }

    closesocket (sock);
    WSACleanup ();
    return 0;
}

void input_pchar (const char* cue, char* arg)
{
    printf (cue);
    fflush (stdin);
    fgets (arg, 16, stdin);
}    

void input_pint (const char* cue, int* arg)
{
    printf (cue);
    fflush (stdin);
    scanf ("%d", arg);
}

程序代码：

#include "stdio.h"
#include "stdlib.h"
#include "Win/winsock2.h"
#include "me/me_net.c"

#define BUF_RECV 2048

void input_pchar (const char* cue, char* arg);
void input_pint (const char* cue, int* arg);

int main (void)
{
    WSADATA data;
    SOCKET sock;

    struct sockaddr_in this;
    struct sockaddr_in that;

    int that_len = sizeof (that);

    char this_IP[16];
    int this_port;

    char buf_recv[BUF_RECV] = {0};


    WSAStartup_check (0x0202, &data);
    sock = socket_check (AF_INET, SOCK_DGRAM, 0);

    this.sin_family = AF_INET;
    input_pint ("Your port: ", &this_port);
    this.sin_port = htons ((unsigned short)this_port);
    input_pchar ("Your IP: ", this_IP);
    this.sin_addr.s_addr = inet_addr (this_IP);
    bind_check (sock, (struct sockaddr*)&this, sizeof (this));    

    while (1)
    {
        recvfrom_check (sock, buf_recv, BUF_RECV, 0, (struct sockaddr*)&that, &that_len);
        printf ("Receive: %s", buf_recv);
    }

    closesocket (sock);
    WSACleanup ();
    return 0;
}

void input_pchar (const char* cue, char* arg)
{
    printf (cue);
    fflush (stdin);
    fgets (arg, 16, stdin);
}    

void input_pint (const char* cue, int* arg)
{
    printf (cue);
    fflush (stdin);
    scanf ("%d", arg);
}