cfg.cb.on_incoming_call is a callback or function pointer. It is pointing to the "address of" (&) the on_incoming_call().
Normally, ur application calls a lib function to get something done. Sometimes the lib function may not know what needs to be done when something happens, like in this case when theres an incoming call - it cannot reject/ring/accept/ the call. The decision is best left to ur application code. You customize and create the logic of what needs to be done for an on_incoming_call() and pass it to the lib. This allows the library to call/notify ur application function when an incoming call occurs.
Hope this helps,
Nigel
Date: Thu, 13 Nov 2008 03:05:33 -0800
From: piyumali2004@xxxxxxxxx
To: pjsip at lists.pjsip.org
Subject: Understanding simple_pjsua.c
Hi,
Can any one please explain me, what is the purpose of the following line of codes in the sample "simple_pjsua.c"(line numbers 129-131) ?
cfg.cb.on_incoming_call = &on_incoming_call;
cfg.cb.on_call_media_state = &on_call_media_state;
cfg.cb.on_call_state = &on_call_state;
Specially what is the purpose of using '&' here?
Regards,
Anupama Pathirage.
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