研究CAsyncSocket类的网络编程数日,始终不明其理,哪位老兄能给指点一下,最好能有个深一点的例子(能接受多连接),谢谢啊;
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#include <winsock2.h>
#include <windows.h>
#include <stdio.h>#define PORT 5150
#define DATA_BUFSIZE 8192typedef struct _SOCKET_INFORMATION {
CHAR Buffer[DATA_BUFSIZE];
WSABUF DataBuf;
SOCKET Socket;
DWORD BytesSEND;
DWORD BytesRECV;
} SOCKET_INFORMATION, * LPSOCKET_INFORMATION;BOOL CreateSocketInformation(SOCKET s);
void FreeSocketInformation(DWORD Event);DWORD EventTotal = 0;
WSAEVENT EventArray[WSA_MAXIMUM_WAIT_EVENTS];
LPSOCKET_INFORMATION SocketArray[WSA_MAXIMUM_WAIT_EVENTS];void main(void)
{
SOCKET Listen;
SOCKET Accept;
SOCKADDR_IN InternetAddr;
DWORD Event;
WSANETWORKEVENTS NetworkEvents;
WSADATA wsaData;
DWORD Ret;
DWORD Flags;
DWORD RecvBytes;
DWORD SendBytes; if ((Ret = WSAStartup(0x0202, &wsaData)) != 0)
{
printf("WSAStartup() failed with error %d\n", Ret);
return;
} if ((Listen = socket (AF_INET, SOCK_STREAM, 0)) == INVALID_SOCKET)
{
printf("socket() failed with error %d\n", WSAGetLastError());
return;
} CreateSocketInformation(Listen); if (WSAEventSelect(Listen, EventArray[EventTotal - 1], FD_ACCEPT|FD_CLOSE) == SOCKET_ERROR)
{
printf("WSAEventSelect() failed with error %d\n", WSAGetLastError());
return;
} InternetAddr.sin_family = AF_INET;
InternetAddr.sin_addr.s_addr = htonl(INADDR_ANY);
InternetAddr.sin_port = htons(PORT); if (bind(Listen, (PSOCKADDR) &InternetAddr, sizeof(InternetAddr)) == SOCKET_ERROR)
{
printf("bind() failed with error %d\n", WSAGetLastError());
return;
} if (listen(Listen, 5))
{
printf("listen() failed with error %d\n", WSAGetLastError());
return;
}
while(TRUE)
{
// Wait for one of the sockets to receive I/O notification and
if ((Event = WSAWaitForMultipleEvents(EventTotal, EventArray, FALSE,
WSA_INFINITE, FALSE)) == WSA_WAIT_FAILED)
{
printf("WSAWaitForMultipleEvents failed with error %d\n", WSAGetLastError());
return;
}
if (WSAEnumNetworkEvents(SocketArray[Event - WSA_WAIT_EVENT_0]->Socket, EventArray[Event -
WSA_WAIT_EVENT_0], &NetworkEvents) == SOCKET_ERROR)
{
printf("WSAEnumNetworkEvents failed with error %d\n", WSAGetLastError());
return;
}
if (NetworkEvents.lNetworkEvents & FD_ACCEPT)
{
if (NetworkEvents.iErrorCode[FD_ACCEPT_BIT] != 0)
{
printf("FD_ACCEPT failed with error %d\n", NetworkEvents.iErrorCode[FD_ACCEPT_BIT]);
break;
} if ((Accept = accept(SocketArray[Event - WSA_WAIT_EVENT_0]->Socket, NULL, NULL)) == INVALID_SOCKET)
{
printf("accept() failed with error %d\n", WSAGetLastError());
break;
} if (EventTotal > WSA_MAXIMUM_WAIT_EVENTS)
{
printf("Too many connections - closing socket.\n");
closesocket(Accept);
break;
} CreateSocketInformation(Accept); if (WSAEventSelect(Accept, EventArray[EventTotal - 1], FD_READ|FD_WRITE|FD_CLOSE) == SOCKET_ERROR)
{
printf("WSAEventSelect() failed with error %d\n", WSAGetLastError());
return;
} printf("Socket %d connected\n", Accept);
}
// Try to read and write data to and from the data buffer if read and write events occur. if (NetworkEvents.lNetworkEvents & FD_READ ||
NetworkEvents.lNetworkEvents & FD_WRITE)
{
if (NetworkEvents.lNetworkEvents & FD_READ &&
NetworkEvents.iErrorCode[FD_READ_BIT] != 0)
{
printf("FD_READ failed with error %d\n", NetworkEvents.iErrorCode[FD_READ_BIT]);
break;
} if (NetworkEvents.lNetworkEvents & FD_WRITE &&
NetworkEvents.iErrorCode[FD_WRITE_BIT] != 0)
{
printf("FD_WRITE failed with error %d\n", NetworkEvents.iErrorCode[FD_WRITE_BIT]);
break;
} LPSOCKET_INFORMATION SocketInfo = SocketArray[Event - WSA_WAIT_EVENT_0]; // Read data only if the receive buffer is empty. if (SocketInfo->BytesRECV == 0)
{
SocketInfo->DataBuf.buf = SocketInfo->Buffer;
SocketInfo->DataBuf.len = DATA_BUFSIZE; Flags = 0;
if (WSARecv(SocketInfo->Socket, &(SocketInfo->DataBuf), 1, &RecvBytes,
&Flags, NULL, NULL) == SOCKET_ERROR)
{
if (WSAGetLastError() != WSAEWOULDBLOCK)
{
printf("WSARecv() failed with error %d\n", WSAGetLastError());
FreeSocketInformation(Event - WSA_WAIT_EVENT_0);
return;
}
}
else
{
SocketInfo->BytesRECV = RecvBytes;
}
} // Write buffer data if it is available. if (SocketInfo->BytesRECV > SocketInfo->BytesSEND)
{
SocketInfo->DataBuf.buf = SocketInfo->Buffer + SocketInfo->BytesSEND;
SocketInfo->DataBuf.len = SocketInfo->BytesRECV - SocketInfo->BytesSEND; if (WSASend(SocketInfo->Socket, &(SocketInfo->DataBuf), 1, &SendBytes, 0,
NULL, NULL) == SOCKET_ERROR)
{
if (WSAGetLastError() != WSAEWOULDBLOCK)
{
printf("WSASend() failed with error %d\n", WSAGetLastError());
FreeSocketInformation(Event - WSA_WAIT_EVENT_0);
return;
} // A WSAEWOULDBLOCK error has occured. An FD_WRITE event will be posted
// when more buffer space becomes available
}
else
{
SocketInfo->BytesSEND += SendBytes; if (SocketInfo->BytesSEND == SocketInfo->BytesRECV)
{
SocketInfo->BytesSEND = 0;
SocketInfo->BytesRECV = 0;
}
}
}
} if (NetworkEvents.lNetworkEvents & FD_CLOSE)
{
if (NetworkEvents.iErrorCode[FD_CLOSE_BIT] != 0)
{
printf("FD_CLOSE failed with error %d\n", NetworkEvents.iErrorCode[FD_CLOSE_BIT]);
break;
} printf("Closing socket information %d\n", SocketArray[Event - WSA_WAIT_EVENT_0]->Socket); FreeSocketInformation(Event - WSA_WAIT_EVENT_0);
}
}
return;
}
BOOL CreateSocketInformation(SOCKET s)
{
LPSOCKET_INFORMATION SI;
if ((EventArray[EventTotal] = WSACreateEvent()) == WSA_INVALID_EVENT)
{
printf("WSACreateEvent() failed with error %d\n", WSAGetLastError());
return FALSE;
} if ((SI = (LPSOCKET_INFORMATION) GlobalAlloc(GPTR,
sizeof(SOCKET_INFORMATION))) == NULL)
{
printf("GlobalAlloc() failed with error %d\n", GetLastError());
return FALSE;
} // Prepare SocketInfo structure for use. SI->Socket = s;
SI->BytesSEND = 0;
SI->BytesRECV = 0; SocketArray[EventTotal] = SI; EventTotal++; return(TRUE);
}
void FreeSocketInformation(DWORD Event)
{
LPSOCKET_INFORMATION SI = SocketArray[Event];
DWORD i; closesocket(SI->Socket); GlobalFree(SI); WSACloseEvent(EventArray[Event]); // Squash the socket and event arrays for (i = Event; i < EventTotal; i++)
{
EventArray[i] = EventArray[i + 1];
SocketArray[i] = SocketArray[i + 1];
} EventTotal--;
}