WinSock Error Codes
The following error codes apply to the WinSock ActiveX Controls.
socket通信在哪一层
Error Code  Error Message
10004  The operation is canceled.
10013  The requested address is a broadcast address, but flag is not set.
10014  Invalid argument.
10022  Socket not bound, invalid address or listen is not invoked prior to accept.
10024  No more file descriptors are available, accept queue is empty.
10035  Socket is non-blocking and the specified operation will block.
10036  A blocking Winsock operation is in progress.
10037  The operation is completed.  No blocking operation is in progress.
10038  The descriptor is not a socket.
10039  Destination address is required.
10040  The datagram is too large to fit into the buffer and is truncated.
10041  The specified port is the wrong type for this socket.
10042  Option unknown, or unsupported.
10043  The specified port is not supported.
10044  Socket type not supported in this address family.
10045  Socket is not a type that supports connection oriented service.
10047  Address Family is not supported.
10048  Address in use.
10049  Address is not available from the local machine.
10050  Network subsystem failed.
10051  The network cannot be reached from this host at this time.
10052  Connection has timed out when SO_KEEPALIVE is set.
10053  Connection is aborted due to timeout or other failure.
10054  The connection is reset by remote side.
10055  No buffer space is available.
10056  Socket is already connected.
10057  Socket is not connected.
10058  Socket has been shut down.
10060  The attempt to connect timed out.
10061  Connection is forcefully rejected.
10201  Socket already created for this object.
10202  Socket has not been created for this object.
11001  Authoritative answer: Host not found.
11002  Non-Authoritative answer: Host not found.
11003  Non-recoverable errors.
11004  Valid name, no data record of requested type.
在打开 Socket 时也要捕获异常
try
ClientSocket.Open;
except
MessageBox(MainForm.Handle,'Error connecting to this address','Connect',MB_ICONEXCLAMATION);
end;
在 OnError 中最后要将 ErrorCode 置为 0
if ErrorEvent=eeConnect then
begin
Socket.Close;
MessageBox(MainForm.Handle,'Error connecting to this address','Connect',MB_ICONEXCLAMATION);
end
else if ErrorEvent=eeSend then
Socket.Close;
ErrorCode:=0;
你可能无做第一步
而这样也可以区分你所说的两种情况
1.第二步 OnError 就是此地址上无任何主机存在 ，到超时就触发 OnError 事件
2.第一步捕捉到异常就是有主机但被扫描的特定端口不存在

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