Re: [Openh323-user] Detecting logical channels

[Robert J. <rob...@bi...>]

On Thu, 12 Jun 2003 19:48:42 -0400
ero...@di... wrote:

> I've working in trying to detect when a logical channel doesnt start. My 
> app currently waits for 4 channels to start before running the external 
> applications.

Mmm, tricky.

> I found the H323Connection::OnReceivedCapabilitySet() method, so i though 
> that looking at the the remote's side capabilities i could match it with 
> the local capabilities and figure out which channels would came alive and 
> which ones not.
> 
> It works, but only if the call is transmitting in both ways (transmit and 
> recieve audio/video). If the call is asymetric (gnomemeeting only 
> transmitting video to me), my algorithm fails. But then i found a 
> GetCapabilityDirection() in the capability, but it always tells me that 
> the gnomemeeting capabilities are in mode recieve. This is the code i use 
> in OnRecievedCapabilitySet():

Capability sets are very complicated, and probably not suitable for your
purpose.

The easiest way is to override OnStartLogicalChannel() and count the
channels opened. Ofg course you will need a timer of some sort external
to this to catch when the channels have NOT been opened.



-----
Robert Jongbloed
OpenH323 & OPAL Architect.