Re: CAsyncSocket OnReceive() never called

"Scott McPhillips [MVP]" <org-dot-mvps-at-scottmcp>
Fri, 27 Apr 2007 13:00:20 -0400
john wayne wrote:

The socket is rightly connected. When I use send() and receive() I can
acquire the correct data but I have to block the thread while the
receive() download all the bytes in the buffer. If after this I need
to know if there is new data the method OnReceive() don't work.

Is your thread blocked? OnReceive will only be called while MFC code
(the message pump) is executing, not while your code is executing.

I have

a MFC Dialog based window and in it I have created a new class
derivated from CAsyncSocket and OnReceive() is a virtual method of it.
After I connect the socket and send a request to the server,
OnReceive() is never called.

I can't understand what you say:

"The thread in which the socket is created must be a message-driven
thread, not a worker thread"

Can you explain me this in a different way? Thanks

Your main thread is a message driven thread (it dispatches windows
messages). That's the kind you need for CAsyncSocket, because its
virtual methods are windows message handlers. So you don't have a
problem here.

MFC also lets you create worker threads, which do not dispatach windows
messages (and therefore do not work with CAsyncSocket).

Scott McPhillips [VC++ MVP]

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