[英]Making udp sockets non-blocking by making the socket Event Driven
我正在嘗試使我的套接字“基於事件”。 以下是我嘗試的方法:
VOID createServerSocket()
{
WSADATA wsa;
//Initialise winsock//
if (WSAStartup(MAKEWORD(2,2),&wsa) != 0)
{
//"WinSock Initialization FAILED",
}
//Create a socket//
SOCKET newSocketIdentifier;
SOCKADDR_IN newSocket;
if((newSocketIdentifier = socket(AF_INET , SOCK_DGRAM , 0 )) == INVALID_SOCKET)
{
//Socket Creation Failed
}
//Socket Created//
//Prepare the sockaddr_in structure//
newSocket.sin_family = AF_INET;
newSocket.sin_addr.s_addr = INADDR_ANY;
newSocket.sin_port = htons(8888);
//Bind//
if( bind(newSocketIdentifier ,(struct sockaddr *)&newSocket, sizeof(SOCKADDR_IN)) == SOCKET_ERROR)
{
//Bind Failed
}
//Bind Done//
WSAEVENT NewEvent = WSACreateEvent();
WSAEventSelect(newSocketIdentifier, NewEvent, FD_READ | FD_WRITE); //made the socket "newSocketIdentifier" event based for events "FD_READ" and FD_WRITE
}
我不知道該如何進一步。 我應如何檢查是否發生了任何期望的事件? 如何連續檢查這些事件? 那會在while(1)循環下嗎?
我在互聯網上找到的所有示例都是針對多個套接字的。 但是,就我而言,我只有一個套接字,並且想使其成為“事件驅動”的讀寫對象。 請幫我。 我被卡住了!
假設您想監聽傳入的UDP數據包,請嘗試並使用以下代碼片段進行查看。
/ Initialize Winsock.
WSADATA wsaData;
int iResult = WSAStartup( MAKEWORD(2,2), &wsaData );
if ( iResult != NO_ERROR )
printf("Error at WSAStartup()\n");
// Create a socket.
SOCKET m_socket[1];
m_socket[0] = socket( AF_INET, SOCK_DGRAM, IPPROTO_UDP );
if ( m_socket[0] == INVALID_SOCKET ) {
printf( "Error at socket(): %ld\n", WSAGetLastError() );
WSACleanup();
return;
}
// Bind the socket.
sockaddr_in service[1];
service[0].sin_family = AF_INET;
service[0].sin_addr.s_addr = INADDR_ANY;
service[0].sin_port = htons( 8888 );
if ( bind( m_socket[0], (SOCKADDR*) &service[0], sizeof(service[0]) ) == SOCKET_ERROR ) {
printf( "bind() failed.\n" );
closesocket(m_socket[0]);
return;
}
char data[256];
int bytes, waitRet;
WSAEVENT hEvent = WSACreateEvent();
WSANETWORKEVENTS events;
WSAEventSelect(*m_socket, hEvent, FD_READ | FD_WRITE);
while(1)
{
waitRet = WSAWaitForMultipleEvents(2, &hEvent, FALSE, WSA_INFINITE, FALSE);
if(WSAEnumNetworkEvents(*m_socket,hEvent,&events) == SOCKET_ERROR)
{
cout << "Error";
}
else
{
if(events.lNetworkEvents & FD_READ)
{
bytes = recv(*m_socket, data, 256, 0);
cout << data << endl;
}
}
}
WSACloseEvent(hEvent);
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