关于组播问题，急急急！
谁能给我一套创建点对多点和多点对多点的组播模型的代码？ 问题点数：36、回复次数：1Top
1 楼caiyi9000（小猫）回复于 2001-06-30 15:09:11 得分 36
给你一个接口函数，它创建一个单向发送或单向接收或双向发送和接收的组播socket
BOOL McSocket::Create (int McFlag)
//McFlag:组播类型
{
//make sure the protocol and capacity exit
WORD wVersionRequested; //request version of winsock
WSADATA wsaData; //returned sock data
int rightsock=0;
int ret;
WSAPROTOCOL_INFO* Proto_Info=NULL;
DWORD length=0;
BOOL Multicast_Supported=FALSE;
INT iProto[2];
wVersionRequested = MAKEWORD( 2,2);
ret = WSAStartup( wVersionRequested, &wsaData ); //initial winsock
if ( ret != 0 )
{
m_Errmsg="Winsock 启动失败";
return FALSE;
}
else if ( LOBYTE( wsaData.wVersion ) != 2 ||HIBYTE( wsaData.wVersion ) != 2 ) //check version
{
m_Errmsg="Winsock 版本不对，请使用WINSOCK2.2";
WSACleanup( );
return FALSE;
}
else //check protocol and capacity
{
iProto[0]=IPPROTO_UDP;
iProto[1]=NULL;
ret=WSAEnumProtocols(iProto, (LPWSAPROTOCOL_INFO)Proto_Info,&length);
if(ret==SOCKET_ERROR && WSAGetLastError() ==WSAENOBUFS)
{
Proto_Info=new WSAPROTOCOL_INFO[length/sizeof(WSAPROTOCOL_INFO)];
if(Proto_Info==NULL)
{
m_Errmsg="申请内存时出错";
WSACleanup();
return FALSE;
}
ret=WSAEnumProtocols(iProto, (LPWSAPROTOCOL_INFO)Proto_Info,&length);
if(ret==SOCKET_ERROR)
{
ret=WSAGetLastError();
m_Errmsg.Format("无法读取协议信息,错误代码：%d",ret);
delete[] Proto_Info;
WSACleanup();
return FALSE;
}
}
//mod 1/9 else
//mod 1/9 {
for(int j=0;j<ret;j++)
{
if(Proto_Info[j].dwServiceFlags1 & XP1_SUPPORT_MULTIPOINT !=0
&& Proto_Info[j].iAddressFamily==AF_INET )
{
Multicast_Supported=TRUE;
rightsock=j;
break; ///mod 1/9 IMPORTANT!!!!
}
}
if(!Multicast_Supported)
{
m_Errmsg="系统不支持组播或无相应协议";
WSACleanup();
return FALSE;
}
//mod 1/9 }
}
//create a multipoint socket
m_Socket=WSASocket(FROM_PROTOCOL_INFO ,
FROM_PROTOCOL_INFO ,
FROM_PROTOCOL_INFO ,
(LPWSAPROTOCOL_INFO)&(Proto_Info[rightsock]),
0,
WSA_FLAG_MULTIPOINT_C_LEAF|WSA_FLAG_MULTIPOINT_D_LEAF);
if(m_Socket==INVALID_SOCKET)
{
ret=WSAGetLastError();
m_Errmsg.Format("创建SOCKET时发生异常，错误代码：%d",ret);
delete[] Proto_Info;
WSACleanup( );
return FALSE;
}
delete[] Proto_Info;
//set the socket notification message
if(WSAAsyncSelect(m_Socket,m_hWnd ,IP_EVENT,FD_CONNECT | FD_CLOSE | FD_WRITE | FD_READ)==SOCKET_ERROR )
{
ret=WSAGetLastError();
m_Errmsg.Format( "在设定操作通知时出错,错误代码：%d",ret);
closesocket(m_Socket);
WSACleanup( );
return FALSE;
}
//假如一个多播组
if(WSAJoinLeaf(m_Socket, (struct sockaddr FAR * )&m_MultiGroup, sizeof(sockaddr), NULL, NULL, NULL, NULL, McFlag) == INVALID_SOCKET)
{
ret=WSAGetLastError();
m_Errmsg.Format(" 加入多点组时出错，错误代码：%d",ret);
closesocket(m_Socket);
WSACleanup( );
return FALSE;
}
return TRUE;
}
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