UDP通讯（客户端）

根据网上的资源修改的：

#include <stdio.h>
#include <string.h>

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

int Client(void);

int main(int argc, char *argv[])
{
    return Client();
}

int Client(void)
{
    char buffer[1024] = "";
    WSADATA wsaData;
    SOCKET socket1;
    struct sockaddr_in local;
    struct sockaddr_in server;
    int serverlen = sizeof (struct sockaddr_in);

    if (WSAStartup(MAKEWORD(2,2), &wsaData) != NO_ERROR)
    {
        printf("Error at WSAStartup().\n");
        return 255;
    }

    local.sin_family = AF_INET;
    local.sin_port = htons(8002);//监听端口
    //local.sin_addr.S_un.S_addr = INADDR_ANY;//本机
    local.sin_addr.S_un.S_addr = inet_addr("192.168.7.104");//本机
    server.sin_family = AF_INET;
    server.sin_port = htons(8001);//server的监听端口
    server.sin_addr.S_un.S_addr = inet_addr("192.168.7.104");//server的地址

    socket1 = socket(AF_INET, SOCK_DGRAM, 0);
    bind(socket1, (struct sockaddr *)&local, sizeof (struct sockaddr_in));
    while (1)
    {
        printf("Input message:\n");
        scanf("%s", buffer);
        if (strcmp(buffer, "bye") == 0)
        {
            break;
        }
        if (sendto(socket1, buffer, strlen(buffer), 0, (struct sockaddr *)&server, serverlen) != SOCKET_ERROR)
        {
            memset(buffer, 0, sizeof (buffer));
            if (recvfrom(socket1, buffer, sizeof (buffer), 0, (struct sockaddr *)&server, &serverlen) != SOCKET_ERROR)
            {
                printf("Received from server(%s:%i): %s\n", inet_ntoa(server.sin_addr), ntohs(server.sin_port), buffer);
            }
        }
    }
    closesocket(socket1);

    return 0;
}