Re: CAsyncSocket connect problem

"Scott McPhillips [MVP]" <org-dot-mvps-at-scottmcp>
Tue, 20 Mar 2007 08:34:29 -0400
mmlab_js wrote:

I write a server-client architecture application. I put the client and
server applictions on the same PC. The client connect successfully to The server can get the message sent from client. In the afternoon,
I put the client application to another PC and it work well. Now, I execute
it , but I get the error code:
Resource temporarily unavailable.
This error is returned from operations on non-blocking sockets that cannot
be completed immediately, for example recv when no data is queued to be read
from the socket. It is a non-fatal error, and the operation should be retried
later. It is normal for WSAEWOULDBLOCK to be reported as the result from
calling connect on a non-blocking SOCK_STREAM socket, since some time must
elapse for the connection to be established.
What shall I check?

As the message says, WSAEWOULDBLOCK means there will be a delay, and is
a normal part of socket communication. CAsyncSocket is designed to
return to you with this code so your application can continue doing
other things during the delay. Your override of OnConnect, OnSend or
OnReceive will be called when the socket delay has cleared. OnConnect
gives you the result of a connection attempt. OnSend means you can try
sending now. OnReceive means there is some incoming data available now.

Scott McPhillips [VC++ MVP]

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