windows 下 udp socket通信

server.c

#include <stdio.h>
#include <winsock2.h>
#include <Windows.h>
 
#pragma comment(lib,"ws2_32.lib")
#define  PORT 6000
 
int main(int argc, char* argv[])
{
	//初始化网络环境
	WSADATA wsa;
	if (WSAStartup(MAKEWORD(2, 2), &wsa) != 0)
	{
		printf("WSAStartup failed\n");
		return -1;
	}
 
	//建立一个UDP的socket
	SOCKET sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
	if (sock == SOCKET_ERROR)
	{
		printf("create socket failed\n");
		return -1;
	}
 
	//绑定地址信息
	struct sockaddr_in serverAddr;
	serverAddr.sin_family = AF_INET;
	serverAddr.sin_port = htons(PORT);
	serverAddr.sin_addr.S_un.S_addr = htonl(INADDR_ANY);
 
	bind(sock, (struct sockaddr*)&serverAddr, sizeof(struct sockaddr));
	
	char buf[512];
	while (TRUE)
	{
		memset(buf, 0, 512);
		// 网络节点的信息，用来保存客户端的网络信息
		struct sockaddr_in clientAddr;
		memset(&clientAddr, 0, sizeof(struct sockaddr_in));
 
		int clientAddrLen = sizeof(struct sockaddr);
		//接收客户端发来的数据
		int ret = recvfrom(sock, buf, 512, 0,(struct sockaddr*) &clientAddr,&clientAddrLen );
		
		printf("Recv msg:%s from IP:[%s] Port:[%d]\n", buf,inet_ntoa(clientAddr.sin_addr),ntohs(clientAddr.sin_port));
		// 发一个数据包返回给客户
		sendto(sock, "Hello World!", strlen("Hello World!"), 0, (struct sockaddr*)&clientAddr, clientAddrLen);
		printf("Send msg back to IP:[%s] Port:[%d]\n", inet_ntoa(clientAddr.sin_addr), ntohs(clientAddr.sin_port));
	}
	return 0;
}

client.c

#include <stdio.h>
#include <winsock2.h>
#include <Windows.h>
 
#pragma comment(lib,"ws2_32.lib")
#define  PORT 6000
int main(int argc, char* argv[])
{
	//初始化网络环境
	WSADATA wsa;
	if (WSAStartup(MAKEWORD(2, 2), &wsa) != 0)
	{
		printf("WSAStartup failed\n");
		return -1;
	}
	//建立一个UDP的socket
	SOCKET sockClient = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
	if (sockClient == INVALID_SOCKET)
	{
		printf("create socket failed\n");
		return -1;
	}
	// 申明一个网络地址信息的结构体，保存服务器的地址信息
	struct sockaddr_in addr = { 0 };
	addr.sin_family = AF_INET;
	addr.sin_port = htons(PORT);
	// addr.sin_port = htons(10014);
    addr.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");
 
	char buf[] = "client test!";
	//发送数据
	int dwSent = sendto(sockClient, buf, strlen(buf), 0, (SOCKADDR *)&addr, sizeof(SOCKADDR));
	if (dwSent == 0)
	{
		printf("send %s failed\n", buf);
		return -1;
	}
	printf("send msg:%s\n", buf);
 
	char recvBuf[512];
	memset(recvBuf, 0, 512);
 
	struct sockaddr_in addrSever = { 0 };
	int nServerAddrLen=sizeof(struct sockaddr_in);
	// 接收数据
	int dwRecv = recvfrom(sockClient, recvBuf, 512, 0, (SOCKADDR *)&addrSever,&nServerAddrLen);
	printf("Recv msg from server : %s\n", recvBuf);
	//关闭SOCKET连接
	closesocket(sockClient);
	//清理网络环境
	WSACleanup();
	system("pause");
	return 0;
}

编译

gcc server.c -o server.exe -lws2_32
gcc client.c -o client.exe -lws2_32

#运行
./server.exe
./client.exe