// udpserver.cpp : 定义控制台应用程序的入口点。
//

#include "stdafx.h"
#include "winsock2.h"
#define BUF_ZIZE 64
#include <iostream>
using namespace std;
#pragma comment(lib,"ws2_32.lib")

int _tmain(int argc, _TCHAR* argv[])
{
    WSADATA wsd;
    SOCKET sServer;
    SOCKET sClient;
    SOCKADDR_IN addrServ;
    SOCKADDR_IN addrClient;
    char buf[BUF_ZIZE];
    int retVal;

    //初始化套接字动态库
    if(WSAStartup(MAKEWORD(2,2),&wsd) != 0)
    {
        cout<<"WSAStartup error"<<endl;
        return 1;
    }

    //创建套接字
    sServer = socket(AF_INET,SOCK_DGRAM,IPPROTO_UDP);
    if(INVALID_SOCKET == sServer)
    {
        cout<<"socket error"<<endl;
        WSACleanup();
        return -1;
    }

    //创建客户端套接字
    sClient = socket(AF_INET,SOCK_DGRAM,IPPROTO_UDP);
    if(INVALID_SOCKET == sClient)
    {
        cout<<"Client socket failed"<<endl;
        WSACleanup();
        return -1;
    }

    //服务器套接字
    addrServ.sin_addr.s_addr = INADDR_ANY;
    addrServ.sin_port = htons(4999);
    addrServ.sin_family = AF_INET;

    //绑定套接字
    retVal = bind(sServer,(LPSOCKADDR)&addrServ,sizeof(SOCKADDR_IN));
    if(retVal == SOCKET_ERROR)
    {
        cout<<"bind erroe"<<endl;
        WSACleanup();
        return -1;

    }
    int len = sizeof(SOCKADDR);
    
    
    //开始等待客户端发来消息
    recvfrom(sServer,buf,BUF_ZIZE,0,(SOCKADDR*)&addrClient,&len);
    cout<<buf<<endl;

    addrClient.sin_family = AF_INET;
    addrClient.sin_addr.s_addr  = inet_addr("127.0.0.1");
    addrClient.sin_port = htons((short)4999);

    //发送给客户端
    ZeroMemory(buf,BUF_ZIZE);
    strcpy(buf,"知道了");
    sendto(sClient,buf,BUF_ZIZE,0,(SOCKADDR*)&addrClient,sizeof(SOCKADDR));

    system("pause");
    closesocket(sServer);
    WSACleanup();
    return 0;
}

// udpclient.cpp : 定义控制台应用程序的入口点。
//

#include "stdafx.h"
#define BUF_SIZE 64
#include "winsock2.h"
#pragma comment(lib,"ws2_32.lib")
#include<iostream>
using namespace std;

int _tmain(int argc, _TCHAR* argv[])
{
    WSADATA wsd;
    SOCKET sHost;
    SOCKET sClient;
    SOCKADDR_IN servAddr;
    char buf[BUF_SIZE];
    char cuf[BUF_SIZE];
    int retVal;

    //初始化套接字动态库
    if(WSAStartup(MAKEWORD(2,2), &wsd) != 0)
    {
        cout<<"WSAStartup failed"<<endl;
        return -1;
    }

    //创建套接字
    sHost = socket(AF_INET,SOCK_DGRAM,IPPROTO_UDP);
    if(INVALID_SOCKET == sHost)
    {
        cout<<"socket failed"<<endl;
        WSACleanup();
        return -1;
    }

    //创建客户端套接字
    sClient = socket(AF_INET,SOCK_DGRAM,IPPROTO_UDP);
    if(INVALID_SOCKET == sClient)
    {
        cout<<"Client socket failed"<<endl;
        WSACleanup();
        return -1;
    }

    //设置服务器地址
    servAddr.sin_family = AF_INET;
    servAddr.sin_addr.s_addr  = inet_addr("127.0.0.1");
    servAddr.sin_port = htons((short)4999);
    int nServAddlen = sizeof(servAddr);


    //发消息送到服务器
    
    ZeroMemory(buf,BUF_SIZE);
    strcpy(buf,"快了");
    sendto(sHost,buf,BUF_SIZE,0,(SOCKADDR*)&servAddr,sizeof(SOCKADDR));


    int len = sizeof(SOCKADDR);
    
    //开始等待服务端发来消息
    ZeroMemory(cuf,BUF_SIZE);
    recvfrom(sClient,cuf,BUF_SIZE,0,(SOCKADDR*)&servAddr,&len);
    cout<<cuf<<endl;


    system("pause");
    //关闭退出
    closesocket(sHost);
    WSACleanup();
    return 0;
}