I am using TTCPBlockSocket
for a TCP/IP Application . The problem is that I can't determine when the connection is lost.
GetLastError
returns 0
Read
returns 0
But I encounter these values eaven if the application is connected so I can get it how can I be notified when the TCP/IP connection is lost.
Thanks
I would say, you can use the CanRead
method, passing 0 to its Timeout
parameter. This function internally performs select
function for the socket and returns False when an error occurs. It should be enough to use just this method since the select
function returns SOCKET_ERROR
if you lose the connection, and it causes the CanRead
method return False as a result. So I think, it's enough to check if the socket connection is alive this way:
function IsSocketAlive(ASocket: TTCPBlockSocket): Boolean;
begin
Result := ASocket.CanRead(0);
end;