VS C++实现UDP本机服务器/客户端通讯

VS C++实现UDP本机服务器/客户端通讯

代码示例

说明：两个工程项目，服务器接收，客户端发送。

服务器（Server/Recv）

#include<stdio.h>
#include<WinSock2.h>
#include<iostream>
#pragma comment(lib,"Ws2_32.lib")

int main()
{
	//初始化winsock
	WSADATA wsaData;
	WSAStartup(MAKEWORD(2, 2), &wsaData);

	//创建套接字，绑定服务器地址
	SOCKET RecvSocket = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
	sockaddr_in RecvAddr;
	RecvAddr.sin_family = AF_INET;
	RecvAddr.sin_port = htons(2222);
	RecvAddr.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");//127.0.0.1是回送地址,指本地机,用来测试使用
	//绑定
	bind(RecvSocket, (sockaddr*)&RecvAddr, sizeof(RecvAddr));

	//接收
	char RecvBuf[1024] = { 0 };
	SOCKADDR_IN SenderAddr;
	int SenderAddrSize = sizeof(SenderAddr);
	recvfrom(RecvSocket,RecvBuf,sizeof(RecvBuf),0,(SOCKADDR*)&SenderAddr,&SenderAddrSize);//连接正确以后是阻塞函数
	std::cout << "Receving..." << std::endl;
	std::cout << RecvBuf<< std::endl;
	std::cout << "Finish Receving!" << std::endl;
	closesocket(RecvSocket);
	WSACleanup();
	system("pause");
	return 0;
}

客户端（Client/Sender）

#include<stdio.h>
#include<WinSock2.h>
#pragma comment(lib,"Ws2_32.lib")

int main()
{
	//初始化winsock，注意需要WSACleanup();
	WSADATA wsaData;
	WSAStartup(MAKEWORD(2, 2), &wsaData);

	//创建套接字，
	SOCKET SendSocket = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
	sockaddr_in SenderAddr;
	SenderAddr.sin_family = AF_INET;
	SenderAddr.sin_port = htons(2222);
	SenderAddr.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");

	//send
	char buf[100] = "hello server";
	sendto(SendSocket, buf, 100, 0, (sockaddr*)&SenderAddr, sizeof(SenderAddr));

	closesocket(SendSocket);
	WSACleanup();
	return 0;
}

UDP详解

c++库函数说明