UDP收发实例

客户端：

#include
#include

struct RData
{
 int hour;
 int minute;
 int second;
 double distance;
 double height;
 double direction;
 int type;
};

RData *AimData;

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("127.0.0.1");
 addrSrv.sin_family=AF_INET;
 addrSrv.sin_port=htons(6000);

 AimData=new RData[8];

 AimData[0].distance=123456789;
 AimData[0].direction=456789123;
 AimData[0].height=789456123;

 sendto(sockClient,(char *)&AimData[0],sizeof(RData),0,
  (SOCKADDR*)&addrSrv,sizeof(SOCKADDR));

 closesocket(sockClient);
 WSACleanup();
}

 

服务器端：

#include
#include
#include
#include

struct RData
{
 int hour;
 int minute;
 int second;
 double distance;
 double height;
 double direction;
 int type;
};

// RData *AimData;
 RData recvData;

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);
// InitWinsock();

 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);

 memcpy(&recvData,recvBuf,sizeof(RData));

 cout<<"dir="< cout<<"dis="< cout<<"hei="<

 closesocket(sockSrv);
 WSACleanup();
}