[网络协议]C++完成UDP接收数据功能

#include <stdio.h>
#include <WinSock2.h>

#pragma comment(lib,"WS2_32.lib")

int main(void)
{
	WSADATA wsd;    // 初始化Socket的变量
	SOCKET s;        // 用于通信的Socket句柄
	SOCKADDR_IN sRecvAddr, sSendAddr;    // 分别为接收地址和发送地址
	USHORT uPort = 14555;                // 通信端口
	CHAR szBuf[1024] = { 0 };            // 通信数据缓冲区
	int nBufLen = 1024, nResult = 0, nSenderAddrSize = sizeof(sSendAddr);

	// 初始化Socket2.2版本
	nResult = WSAStartup(MAKEWORD(2, 2), &wsd);
	if (nResult != NO_ERROR)
	{
		printf("WSAStartup failed:%d\n", WSAGetLastError());
		return 1;
	}

	// 创建一个Socket,SOCK_DGRAM表示UDP类型
	s = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
	if (s == INVALID_SOCKET)
	{
		printf("socket failed:%d\n", WSAGetLastError());
		return 1;
	}

	// 填充Socket接口
	sRecvAddr.sin_family = AF_INET;        // 地址协议,AF_INET支持TCP和UDP
	sRecvAddr.sin_port = htons(uPort);    // 通信端口,htons转为网络字节顺序
	sRecvAddr.sin_addr.S_un.S_addr = htonl(INADDR_ANY);    // 接收任意地址数据

	// 绑定Socket至本机
	nResult = bind(s, (SOCKADDR *)&sRecvAddr, sizeof(sRecvAddr));
	if (nResult != 0)
	{
		printf("bind failed:%d\n", WSAGetLastError());
		return 1;
	}

	printf("Waiting recv data...\n");

	while (1)
	{
		// 阻塞式接收数据
		nResult = recvfrom(s, szBuf, nBufLen, 0, (SOCKADDR *)&sSendAddr, &nSenderAddrSize);
		if (nResult == SOCKET_ERROR)
		{
			printf("recvfrom failed:%d\n", WSAGetLastError());
		}
		else
		{
			//printf("SenderIP  :%s\n", inet_ntoa(sSendAddr.sin_addr));
			printf("SenderData:%s\n", szBuf);
		}
	}
	// 关闭Socket连接
	nResult = closesocket(s);
	if (nResult == SOCKET_ERROR)
	{
		printf("closesocket failed:%d\n", WSAGetLastError());
		return 1;
	}
	// 清理Socket
	WSACleanup();

	system("pause");
	return 0;
}