基于UDP的SOCKET程序

基于UDP的比较特殊，是无连接的。

客户端没有了 connect的过程，直接发送 sendto

 

服务端没有了  listen和accepct 的过程，直接recvfrom

 

服务端：

 

#include <WINSOCK2.H> #include <stdio.h> #include <iostream> using namespace std; void main() { WORD wVersionRequested; WSADATA wsaData; int err; wVersionRequested = MAKEWORD( 2, 2 ); err = WSAStartup( wVersionRequested, &wsaData ); if ( err != 0 ) { /* Tell the user that we could not find a usable */ /* WinSock DLL. */ return; } /* Confirm that the WinSock DLL supports 2.2.*/ /* Note that if the DLL supports versions greater */ /* than 2.2 in addition to 2.2, it will still return */ /* 2.2 in wVersion since that is the version we */ /* requested. */ if ( LOBYTE( wsaData.wVersion ) != 2 || HIBYTE( wsaData.wVersion ) != 2 ) { /* Tell the user that we could not find a usable */ /* WinSock DLL. */ WSACleanup( ); return; } SOCKET srvSocket=socket(AF_INET,SOCK_DGRAM,0); sockaddr_in serviceAddr; serviceAddr.sin_family=AF_INET; serviceAddr.sin_port=htons(5000); serviceAddr.sin_addr.S_un.S_addr=inet_addr("192.168.1.101"); bind(srvSocket,(sockaddr*)(&serviceAddr),sizeof(serviceAddr)); char recvBuf[100]; sockaddr_in clienAddr; int len=sizeof(sockaddr); while (true) { recvfrom(srvSocket,recvBuf, 100,0,(sockaddr*)&clienAddr,&len); cout<<recvBuf<<endl; sendto(srvSocket,"I had receive",100,0,(sockaddr*)&clienAddr,len); memset(recvBuf,0,100); } closesocket(srvSocket); WSACleanup(); }

 

 

客户端:

 

 

 #include <WINSOCK2.H> #include <stdio.h> #include <iostream> using namespace std; void main() { WORD wVersionRequested; WSADATA wsaData; int err; wVersionRequested = MAKEWORD( 2, 2 ); err = WSAStartup( wVersionRequested, &wsaData ); if ( err != 0 ) { /* Tell the user that we could not find a usable */ /* WinSock DLL. */ return; } /* Confirm that the WinSock DLL supports 2.2.*/ /* Note that if the DLL supports versions greater */ /* than 2.2 in addition to 2.2, it will still return */ /* 2.2 in wVersion since that is the version we */ /* requested. */ if ( LOBYTE( wsaData.wVersion ) != 2 || HIBYTE( wsaData.wVersion ) != 2 ) { /* Tell the user that we could not find a usable */ /* WinSock DLL. */ WSACleanup( ); return; } SOCKET clientSocket=socket(AF_INET,SOCK_DGRAM,0); sockaddr_in serviceAddr; serviceAddr.sin_family=AF_INET; serviceAddr.sin_port=htons(5000); serviceAddr.sin_addr.S_un.S_addr=inet_addr("192.168.1.101"); char sendBuf[100]; int len=sizeof(sockaddr); char recvBuf[100]; while(cin>>sendBuf) { sendto(clientSocket,sendBuf,100,0,(sockaddr*)&serviceAddr,len); recvfrom(clientSocket,recvBuf,100,0,(sockaddr*)&serviceAddr,&len); cout<<recvBuf<<endl; memset(recvBuf,0,100); } closesocket(clientSocket); WSACleanup(); }