UDP通讯（服务端）

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 Server(void);

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

int Server(void)
{
    char buffer[1024] = "";
    WSADATA wsaData;
    SOCKET socket1;
    struct sockaddr_in local;
    struct sockaddr_in from;
    int fromlen = 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(8001);//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
    
    socket1 = socket(AF_INET, SOCK_DGRAM, 0);
    bind(socket1, (struct sockaddr *)&local, sizeof (struct sockaddr_in));
    while (1)
    {
        printf("Waiting for message from others ...\n");
        memset(buffer, 0, sizeof (buffer));
        if (recvfrom(socket1, buffer, sizeof (buffer), 0, (struct sockaddr *)&from, &fromlen) != SOCKET_ERROR)
        {
            printf("Received from Client(%s:%i): %s\n", inet_ntoa(from.sin_addr), ntohs(from.sin_port), buffer);
            //给client发信息
            sendto(socket1, buffer, strlen(buffer), 0, (struct sockaddr *)&from, fromlen);
        }
        Sleep(500);
    }
    closesocket(socket1);

    return 0;
}