udpserver.cpp

WinSocket各种阻塞非阻塞模式的简单例子都已通过调试适合网络编程初学者

#include "../comm/initsock.h"
#include <stdio.h>

CInitSock initSock;

int main()
{
	//创建udp套接字
	SOCKET s = ::socket(AF_INET,SOCK_DGRAM, IPPROTO_UDP);
	if (s == INVALID_SOCKET)
	{
		printf("Failed socket()\n");
		return 0;
	}

	//填充sockaddr_in结构
	sockaddr_in sin;
	sin.sin_family = AF_INET;
	sin.sin_port = htons(4567);
	sin.sin_addr.S_un.S_addr = INADDR_ANY;

	//绑定这个套接字到一个本地地址
	if (::bind(s, (LPSOCKADDR)&sin, sizeof(sin)) == SOCKET_ERROR)
	{
		printf("Failed bind()\n");
		return 0;
	}
	
	//接受数据
	char buff[1024];
	sockaddr_in addr;
	int nLen = sizeof(addr);
	while (TRUE)
	{
		int nRecv = ::recvfrom(s, buff, 1024, 0, (SOCKADDR*)&addr, &nLen);
		if (nRecv > 0)
		{
			buff[nRecv] = '\0';
			printf(" 接收到数据(%s):%s", ::inet_ntoa(addr.sin_addr), buff);
		}
	}

	closesocket(s);
	return 0;
}