socket编程基于UDP的服务端客户端回声程序

前两次的socket网络编程程序都是基于TCP 的，而这次使用UDP非面向连接的协议来写的，只管发送就可以了，在发送数据量小的情况下非常有效率，发送的这些数据不能是重要的数据，因为可能发生数据丢失、损毁等情况。Talk is cheap , show me the code.

server.c

#include<stdlib.h>
#include<stdio.h>
#include<WinSock2.h>
#define RECV_BUF_SIZE 1024
#pragma comment(lib,"ws2_32.lib")
int main(){
WSADATA wsd;
SOCKET sServer;
SOCKADDR_IN addrServer, addrClient;
int recvCount = 100;
int sizeAddrClient = 0;
char recvBuf[RECV_BUF_SIZE];
memset(recvBuf, 0, RECV_BUF_SIZE);
//初始化socket库
if (WSAStartup(MAKEWORD(2, 2), &wsd) != 0){
ErrorHandling("WSAStartup error!");
}
puts("初始化socket库");

//创建服务端socket
sServer = socket(AF_INET, <strong><span style="color:#ff0000;">SOCK_DGRAM</span></strong>, 0);
if (sServer == INVALID_SOCKET){
ErrorHandling("socket() error!");
}
puts("创建服务端socket");

//初始化网络地址信息
memset(&addrServer, 0, sizeof(addrServer));
addrServer.sin_family = AF_INET;
addrServer.sin_addr.S_un.S_addr = htonl(ADDR_ANY);
addrServer.sin_port = htons(6000);
puts("初始化网络地址信息");

//绑定地址信息到服务端socket
if (bind(sServer, (SOCKADDR*)&addrServer, sizeof(addrServer)) == SOCKET_ERROR){
ErrorHandling("bind() error!");
}
printf("%d",WSAGetLastError());
puts("绑定地址信息到服务端socket");
sizeAddrClient = sizeof(SOCKADDR);
//循环接收消息(我规定最多为200次)
while (recvCount>0){
int recvNum = recvfrom(sServer, recvBuf, RECV_BUF_SIZE,0, (SOCKADDR*)&addrClient, &sizeAddrClient);
printf("%d",recvNum);
sendto(sServer, recvBuf, RECV_BUF_SIZE, 0, (SOCKADDR*)&addrClient, sizeAddrClient);
printf("Echo:%s\n", recvBuf);
memset(recvBuf, 0, 1024);
recvCount--;
}
//关闭socket
closesocket(sServer);
WSACleanup();
puts("关闭socket");
system("pause");
return 0;
}

client.c

</pre><pre class="cpp" name="code" snippet_file_name="blog_20160404_5_4651503" code_snippet_id="1634444">#include<stdlib.h>
#include<stdio.h>
#include<WinSock2.h>
#pragma comment(lib,"ws2_32.lib")
void ErrorHandling(char * msg){
puts(msg);
system("pause");
exit(1);
}
int main(){
WSADATA wsd;
SOCKET  sClient;
SOCKADDR_IN addrServer;
int sizeaddrServer = 0;
int recvCount = 100;
char charBuf[1024] = { 0 };
//初始化socket库
if (WSAStartup(MAKEWORD(2, 2), &wsd) != 0){
ErrorHandling("WSAStartup error!");
}
puts("初始化socket库");

//创建客户端socket
sClient = socket(AF_INET, SOCK_DGRAM, 0);
if (sClient == INVALID_SOCKET){
ErrorHandling("socket() error!");
}
puts("创建客户端socket");

//初始化网络地址信息
memset(&addrServer, 0, sizeof(addrServer));
addrServer.sin_family = AF_INET;
addrServer.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");
addrServer.sin_port = htons(6000);
puts("初始化网络地址信息");

//连接服务端
if (connect(sClient, (SOCKADDR*)&addrServer, sizeof(addrServer)) == SOCKET_ERROR){
ErrorHandling("connect error!");
}
puts("现在可以向服务端发送消息");
//循环发送消息(我规定最多为200次)
int recvNum = 0;
char charRecv[1024];
char recvBuf[1024];
memset(recvBuf, 0, 1024);
memset(charRecv, 0, 1024);
int addrSize=sizeof(SOCKADDR);
while (recvCount>0){
memset(charBuf, 0, 1024);
memset(recvBuf, 0, 1024);
printf("To:");
gets(charBuf);
int sendLen = sendto(sClient, charBuf, 1024,0,(SOCKADDR*)&addrServer,sizeof(SOCKADDR));
int recvLen = recvfrom(sClient, recvBuf, 1024, 0, (SOCKADDR*)&addrServer, &addrSize);
if (recvLen==-1){
printf("服务器未响应\n");
}
else{
printf("来自服务器的消息:%s\n",recvBuf);
}

recvCount--;
}
//关闭socket
closesocket(sClient);
WSACleanup();
puts("关闭socket");
system("pause");
return 0;
}

不明白的地方，请回复。