Experimental Physics and
Industrial Control System

"Jeff Hill" <[email protected]> · Wed, 14 Nov 2007 09:29:26 -0700

Hello Xu HuiJuan,

> I want to create all channels in one file with ca_create_channel() or
> ca_search() and handle each record in another file. I can't get the
> desired channel data.

In addition to Dirk's comments,

Make certain also that you have received notification informing your program
that the CA channel has connected before attempting the CA get. This can be
done in two ways. If you supply the address of a connection callback
function to ca_create_channel() then notification arrives when this callback
function is called by the library. If you supply a nill (zero) address for
the connection callback function to ca_create_channel() then ca_pend_io()
can be used to block until all of the channels (created since the last call
to ca_pend_io() or the start of the program {start of the CA context} )
connect.

I hope that I have successfully answered your question. Feel free to contact
me via email if you have more specific questions.

Jeff Hill

> -----Original Message-----
> From: [email protected] [mailto:tech-talk-
> [email protected]] On Behalf Of Xu HuiJuan
> Sent: Tuesday, November 13, 2007 12:22 AM
> To: [email protected]
> Subject: help
> 
> Hi, there is a question bothering me.
> I want to create all channels in one file with ca_create_channel() or
> ca_search() and handle each record in another file. I can't get the
> desired
> channel data.
> Is this method work?
> If it is, is there anything specific I should pay attention to?
> Thanks!
> 
> 
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> Open WebMail Project (http://openwebmail.org)

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System