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
#include
#include
#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, SOCK_DGRAM, 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

#include
#include
#include
#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;
}

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