c++中UDP通信实现



client端

#include

#include

#pragma comment(lib,"ws2_32.lib")

void main() 

{ 

WORD wVersionRequested; 

WSADATA wsaData; 

int err; 

wVersionRequested=MAKEWORD(1,1); 

err = WSAStartup(wVersionRequested, &wsaData); 

if (err != 0) 

{ 

return; 

} 

if (LOBYTE(wsaData.wVersion)!=1 || 

HIBYTE(wsaData.wVersion)!=1) 

{ 

WSACleanup(); 

return; 

} 

SOCKET sockSrv=socket(AF_INET,SOCK_DGRAM,0);

SOCKADDR_IN addrSrv;

addrSrv.sin_addr.S_un.S_addr=htonl(INADDR_ANY);

addrSrv.sin_family=AF_INET;

addrSrv.sin_port=htons(6000);

bind(sockSrv,(SOCKADDR*)&addrSrv,sizeof(SOCKADDR));

SOCKADDR_IN addrClient;

int len=sizeof(SOCKADDR);

char recvBuf[100];

recvfrom(sockSrv,recvBuf,100,0,(SOCKADDR*)&addrClient,&len);

printf("%s\n",recvBuf);

closesocket(sockSrv);

WSACleanup();

}

server端

#include

#include

#pragma comment(lib,"ws2_32.lib")

void main() 

{ 

WORD wVersionRequested; 

WSADATA wsaData; 

int err; 

wVersionRequested=MAKEWORD(1,1); 

err = WSAStartup(wVersionRequested, &wsaData); 

if (err != 0) 

{ 

return; 

} 

if (LOBYTE(wsaData.wVersion)!=1 || 

HIBYTE(wsaData.wVersion)!=1) 

{ 

WSACleanup(); 

return; 

}

SOCKET sockClient=socket(AF_INET,SOCK_DGRAM,0);

SOCKADDR_IN addrSrv;

addrSrv.sin_addr.S_un.S_addr=inet_addr("192.168.0.104");

addrSrv.sin_family=AF_INET;

addrSrv.sin_port=htons(6000);

sendto(sockClient,"Hello",strlen("Hello")+1,0,

(SOCKADDR*)&addrSrv,sizeof(SOCKADDR));

closesocket(sockClient);

WSACleanup();

}