UDP-Win练习

基本上同TCP，

服务器：

 

#include <winsock2.h>
#include <stdio.h>
#include <stdlib.h>
#pragma comment(lib,"ws2_32.lib")//增加几个相关lib库


#define DEFAULT_PORT 5150
#define DEFAULT_BUFFER 4096


int main(int argc,char **argv)
{
    WSADATA wsd;
    SOCKET sListen;
    int iAddrSize, ret;
    struct sockaddr_in local;
    char szBuff[DEFAULT_BUFFER];

    if(WSAStartup(MAKEWORD(2,2), &wsd)!=0)
    {
        printf("Failed to load Winsock!\n");
        return 1;
    }
    sListen = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);
    if(sListen == SOCKET_ERROR)
    {
        printf("%d\n", WSAGetLastError());
    }

    local.sin_addr.s_addr = htonl(INADDR_ANY);
    local.sin_family = AF_INET;
    local.sin_port = htons(5000);


    if(bind(sListen, (struct sockaddr *)&local, sizeof(local))==SOCKET_ERROR)
    {
        printf("%d\n", WSAGetLastError());
        return 1;
    }

    while(1)
    {
        iAddrSize = sizeof(local);
        ret = recvfrom(sListen, szBuff, DEFAULT_BUFFER, 0, (struct sockaddr *)&local, &iAddrSize);

        if(ret==0) break;
        else if(ret == SOCKET_ERROR)
        {
            printf("%d\n", WSAGetLastError());
            break;
        }else{
            szBuff[ret]='\0';
            printf("RECV:%s", szBuff);
        }
        
    }
    closesocket(sListen);
    WSACleanup();
    return 0;

}

客户端：

#include <winsock2.h>
#include <stdio.h>
#include <stdlib.h>
#pragma comment(lib,"ws2_32.lib")//增加几个相关lib库


#define DEFAULT_PORT 5150
#define DEFAULT_BUFFER 4096


int main(int argc,char **argv)
{
    WSADATA wsd;
    SOCKET sListen;
    int iAddrSize;
    struct sockaddr_in local;

    if(WSAStartup(MAKEWORD(2,2), &wsd)!=0)
    {
        printf("Failed to load Winsock!\n");
        return 1;
    }
    sListen = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);
    if(sListen == SOCKET_ERROR)
    {
        printf("%d\n", WSAGetLastError());
    }

    local.sin_port = htons(5000);
    local.sin_family=AF_INET;
    local.sin_addr.s_addr = inet_addr("10.144.15.6");

    iAddrSize = sizeof(local);
    
    char msg[100]=" i am toy\n";
    sendto(sListen, msg, strlen(msg),0, (struct sockaddr *)&local, iAddrSize);

    closesocket(sListen);
    WSACleanup();
    return 0;

}