使用winsock+UDP写的一个简单接收端程序

]//先打开服务器端，服务器在执行完recvfrom()后堵塞，等待接收数据...
#include <winsock2.h>
#include <stdio.h>
#pragma comment(lib,"WS2_32.LIB")
void main()
{
WSADATA         wsaData;
SOCKET          ReceivingSocket;
SOCKADDR_IN     ReceiverAddr;
int             Port = 8060;
char            ReceiveBuf[1024] = {0};
int             BufLength = 1024;
SOCKADDR_IN     SenderAddr;
int             SenderAddrSize = sizeof(SenderAddr);
int             Ret;
//初始化Winsock 2.2版本
if((Ret = WSAStartup(MAKEWORD(2,2),&wsaData)) !=0)
{
printf("ERROR:WSAStartup failed with %d/n",Ret);
return;
}
//创建一个新的套接字来接收数据报
if((ReceivingSocket = socket(AF_INET,SOCK_DGRAM,IPPROTO_UDP)) == INVALID_SOCKET)
{
printf("ERROR:SOCKET failed with %d/n",WSAGetLastError());
WSACleanup();
return;
}
//建立一个SOCKDDR_IN结构，这个结构将告知bind我们想要使用5150端口接收来自
//所有接口的数据报
ReceiverAddr.sin_family = AF_INET;
ReceiverAddr.sin_port = htons(Port);
ReceiverAddr.sin_addr.s_addr = htonl(INADDR_ANY);
//使用bind将这个地址信息和套接字关联起来
if((bind(ReceivingSocket,(SOCKADDR*)&ReceiverAddr,sizeof(ReceiverAddr))) == SOCKET_ERROR)
{
printf("ERROR:bind failed with %d/n",WSAGetLastError());
closesocket(ReceivingSocket);
WSACleanup();
return;
}
////先打开服务器端，服务器在执行完recvfrom()后堵塞，等待接收数据...
printf("wait to receive data.../n");
if((Ret = recvfrom(ReceivingSocket,ReceiveBuf,BufLength,0,(SOCKADDR *)&SenderAddr,&SenderAddrSize))
== SOCKET_ERROR)
{
printf("ERROR: recvfrom failed with error %d/n", WSAGetLastError());
closesocket(ReceivingSocket);
WSACleanup();
return;
}
printf("We successfully received %d bytes from address %s:%d./n", Ret,
inet_ntoa(SenderAddr.sin_addr), ntohs(SenderAddr.sin_port));
for(int id=0; id<5 ; ++id)
printf("%c",ReceiveBuf[id]);
//应用程序结束接收数据报后，关闭套接字
closesocket(ReceivingSocket);
//应用程序结束后，调用WSACleanup
WSACleanup();
}