UDP socket通讯

// UDPServer.cpp
 
#include < stdio.h >
#include < WINSOCK2.H >
 
#pragma comment(lib,"WS2_32.lib")
#define BUF_SIZE    64
 
int main(void)
{
     WSADATA wsd;
     SOCKET  s;
     int     nRet;
 
     // 初始化套接字动态库
     if(WSAStartup(MAKEWORD(2,2),&wsd) != 0)
     {
         printf("WSAStartup failed !\n");
         return 1;
     }
 
     // 创建套接字
     s = socket(AF_INET,SOCK_DGRAM,0);
     if(s == INVALID_SOCKET)
     {
         printf("socket() failed ,Error Code:%d\n",WSAGetLastError());
         WSACleanup();
         return 1;
     }
 
     SOCKET      socketSrv = socket(AF_INET,SOCK_DGRAM,0);
     SOCKADDR_IN addrSrv;
     SOCKADDR_IN addrClient;
     char        buf[BUF_SIZE];
     int         len = sizeof(SOCKADDR);
 
     // 设置服务器地址
     ZeroMemory(buf,BUF_SIZE);
     addrSrv.sin_addr.S_un.S_addr = htonl(INADDR_ANY);
     addrSrv.sin_family = AF_INET;
     addrSrv.sin_port = htons(5000);
 
     // 绑定套接字
     nRet = bind(socketSrv,(SOCKADDR*)&addrSrv,sizeof(SOCKADDR));
     if(SOCKET_ERROR == nRet)  
     {  
         printf("bind failed !\n");  
         closesocket(s);  
         WSACleanup();  
         return -1;  
     }
 
     // 从客户端接收数据
     nRet = recvfrom(socketSrv,buf,BUF_SIZE,0,(SOCKADDR*)&addrClient,&len);
     if(SOCKET_ERROR == nRet)  
     {  
         printf("recvfrom failed !\n");  
         closesocket(s);  
         WSACleanup();  
         return -1;  
     }
     // 打印来自客户端发送来的数据
     printf("Recv From Client:%s\n",buf);
 
     // 向客户端发送数据
     sendto(socketSrv,"UDP Hello World !",sizeof("UDP Hello World !"),0,(SOCKADDR*)&addrClient,len);
     closesocket(s);
     WSACleanup();
     return 0;
}

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//////////////////////////////////////////////////////////////////////////
// UDPClient.cpp
 
#include < stdio.h >
#include < WINSOCK2.H >
 
#pragma comment(lib,"WS2_32.lib")
#define BUF_SIZE    64
 
int main(void)
{
     WSADATA wsd;   
     SOCKET  s;
 
     // 初始化套接字动态库
     if(WSAStartup(MAKEWORD(2,2),&wsd) != 0)
     {
         printf("WSAStartup failed !\n");
         return 1;
     }
 
     // 创建套接字
     s = socket(AF_INET,SOCK_DGRAM,0);
     if(s == INVALID_SOCKET)
     {
         printf("socket() failed, Error Code:%d\n",WSAGetLastError());
         WSACleanup();
         return 1;
     }
 
     char        buf[BUF_SIZE];  // 接受数据
     SOCKADDR_IN servAddr;       // 服务器套接字地址
     SOCKET      sockClient = socket(AF_INET,SOCK_DGRAM,0);
     int         nRet;
 
     ZeroMemory(buf,BUF_SIZE);
     strcpy(buf,"UDP Hello World !");
 
     // 设置服务器地址
     servAddr.sin_family = AF_INET;
     servAddr.sin_addr.S_un.S_addr = inet_addr("192.168.1.254");
     servAddr.sin_port = htons(5000);
 
     // 向服务器发送数据
     int nServAddLen = sizeof(servAddr);
     if(sendto(sockClient,buf,BUF_SIZE,0,(sockaddr *)&servAddr,nServAddLen) == SOCKET_ERROR)
     {
         printf("recvfrom() failed:%d\n",WSAGetLastError());
         closesocket(s);
         WSACleanup();
         return 1;
     }
     nRet = recvfrom(sockClient,buf,BUF_SIZE,0,(sockaddr *)&servAddr,&nServAddLen);
     if(SOCKET_ERROR == nRet)  
     {  
         printf("recvfrom failed !\n");  
         closesocket(s);  
         WSACleanup();  
         return -1;  
     }
 
     // 打印来自服务端发送来的数据
     printf("Recv From Server:%s\n",buf);
     closesocket(s);
     WSACleanup();
     return 0;
}

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