C++ UDP客户端服务器Socket编程

UDPServer.cpp

#include<WINSOCK2.H>

#include<iostream>

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

using namespace std;

int main()

{

WSADATA wsaData;//初始化

SOCKET SendSocket;

sockaddr_in RecvAddr;//服务器地址

int Port=4000;//服务器监听地址

char SendBuf[1024];//发送数据的缓冲区

int BufLen=1024;//缓冲区大小

//初始化Socket

WSAStartup(MAKEWORD(2,2),&wsaData);

//创建Socket对象

SendSocket=socket(AF_INET,SOCK_DGRAM,IPPROTO_UDP);

//设置服务器地址

RecvAddr.sin_family=AF_INET;

RecvAddr.sin_port=htons(Port);

RecvAddr.sin_addr.s_addr=inet_addr("192.168.137.1");

//向服务器发送数据报

printf("Sending a datagram to the receiver...\n");

sendto(SendSocket,SendBuf,BufLen,0,(SOCKADDR *)&RecvAddr,sizeof(RecvAddr));

//发送完成，关闭Socket

printf("finished sending,close socket.\n");

closesocket(SendSocket);

printf("Exting.\n");

WSACleanup();

return 0;

}

UDPClient.cpp

#include<WINSOCK2.H>

#include<iostream>

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

using namespace std;

int main()

{

WSADATA wsaData;//初始化

SOCKET RecvSocket;

sockaddr_in RecvAddr;//服务器地址

int Port=4000;//服务器监听地址

char RecvBuf[1024];//发送数据的缓冲区

int BufLen=1024;//缓冲区大小

sockaddr_in SenderAddr;

int SenderAddrSize=sizeof(SenderAddr);

//初始化Socket

WSAStartup(MAKEWORD(2,2),&wsaData);

//创建接收数据报的socket

RecvSocket=socket(AF_INET,SOCK_DGRAM,IPPROTO_UDP);

//将socket与制定端口和0.0.0.0绑定

RecvAddr.sin_family=AF_INET;

RecvAddr.sin_port=htons(Port);

RecvAddr.sin_addr.s_addr=htonl(INADDR_ANY);

bind(RecvSocket,(SOCKADDR *)&RecvAddr,sizeof(RecvAddr));

//调用Recvfrom函数在绑定的socket上接收数据

printf("receiving datagrams...\n");

recvfrom(RecvSocket,RecvBuf,BufLen,0,(SOCKADDR *)&SenderAddr,&SenderAddrSize);

//关闭socket，结束接收数据

printf("finished receiving,closing socket..\n");

closesocket(RecvSocket);

//释放资源，退出

printf("Exiting.\n");

WSACleanup();

return 0;

}