UDP实现网络通信（客户端和服务端）

内容简介

主要通过UDP实现客户端和服务端的通信，程序主要包括Server.c和Client.c.执行流程为：先启动服务端，然后在启动客户端，客户端向服务端发送消息，服务端收到后给客户端回消息，这样一发一回进行客户端和服务端的交互。

代码

Server.c

#include<WinSock2.h>
#include<stdio.h>
#pragma warning(disable:4996)
#pragma comment(lib,"ws2_32.lib")
#define BUFFER_SIZE 1024
#define PORT 6000
int main()
{
	WSADATA WSAData;
	char receBuf[BUFFER_SIZE];
	if (WSAStartup(MAKEWORD(2, 2), &WSAData) != 0)
	{
		printf("初始化失败");
		return -1;
	}
	SOCKET sockServer = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
	if (sockServer == INVALID_SOCKET)
	{
		printf("Faile socket()\n");
		return -2;
	}
	SOCKADDR_IN addr_Server;
	addr_Server.sin_family = AF_INET;
	addr_Server.sin_port = htons(PORT);
	addr_Server.sin_addr.S_un.S_addr = INADDR_ANY;
	if (bind(sockServer, (SOCKADDR*)&addr_Server, sizeof(addr_Server)) == SOCKET_ERROR)
	{
		printf("Failed socket()%d\n", WSAGetLastError());
		return 0;
	}
	SOCKADDR_IN addr_Client;
	int addr_ClientLen = sizeof(SOCKADDR);
	while (TRUE)
	{
		int last =recvfrom(sockServer, receBuf, sizeof(receBuf), 0, (SOCKADDR*)&addr_Client, &addr_ClientLen);
		receBuf[last] = '\0';
		printf("接收到数据（%s）:%s\n", inet_ntoa(addr_Client.sin_addr), receBuf);
		memset(receBuf, 0, sizeof(receBuf));
		printf("Please input send content: ");
		scanf("%s", receBuf);
		sendto(sockServer, receBuf, strlen(receBuf), 0, (SOCKADDR*)&addr_Client, sizeof(SOCKADDR));
		memset(receBuf, 0, strlen(receBuf));
	}
	closesocket(sockServer);
	WSACleanup();
	return 0;
}

Client.c

#include<stdio.h>
#include<winsock2.h>
#include<string.h>
//#include<Windows.h>
#pragma comment(lib,"ws2_32.lib")
#pragma warning(disable:4996)
#define BUFFER_SIZE 10240
#define PORT 6000
int main(int argc, const char*argv[])
{
	char receBuf[BUFFER_SIZE];
	char sendBuf[BUFFER_SIZE];
	//初始化网络环境
	WSADATA wsa;
	if (WSAStartup(MAKEWORD(2, 2), &wsa) != 0)
	{
		printf("WSAStartup failed\n");
		return -1;
	}
	SOCKET sock_Client = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
	if(sock_Client == INVALID_SOCKET)
	{
		printf("create socket failed\n");
		return -1;
	}
	//绑定地址信息
	SOCKADDR_IN serverAddr;
	serverAddr.sin_family = AF_INET;
	serverAddr.sin_port = htons(PORT);
	serverAddr.sin_addr.S_un.S_addr =inet_addr("127.0.0.1");
	SOCKADDR_IN clientAddr;
	int clientLen = sizeof(clientAddr);
	while (TRUE)
	{
		printf("Please input send content: ");
		scanf("%s", sendBuf);
		sendto(sock_Client, sendBuf, strlen(sendBuf), 0, (SOCKADDR*)&serverAddr, sizeof(SOCKADDR));
		memset(sendBuf, 0, sizeof(sendBuf));
		int last = recvfrom(sock_Client, receBuf, sizeof(receBuf), 0, (SOCKADDR*)&clientAddr, &clientLen);
		if (last == 0)
		{
			printf("recv failed\n");
		}
		receBuf[last] = '\0';
		printf("recvfrom=%s\n",receBuf);
		memset(receBuf, 0, sizeof(receBuf));
	}
	closesocket(sock_Client);
	WSACleanup();
	return 0;
}

运行结果