llListenRemove

[Innula Zenovka]

Someone asked me to help them tweak a script they'd bought, which I did, and while I was so doing, I noticed something I've never seen before.

The script was switching between listening to the owner on integer chat_channel and integer dialog_channel, depending on whether there was a menu open or not.   Now, when I do this, I have a global called integer handle, and then say

llListenRemove(handle);
handle = llListen(dialog_channel,"",owner,"");
// or
handle = llListen(chat_channel,"",owner,"");

 as appropriate, which is how I learned to do it from the old lsl wiki.

The way this script did it, though, was  on the lines of

 

llListen(-999,"",owner,"");//open the dialog listener
//and then
llListenRemove(-999);//to close it

I don't think anything gets closed that way, and I've certainly never seen it done like that.  

I thought the integer you remove in llListenRemove(integer number) was the callback number and nothing to do with the channel.   However, the original script was clearly written by someone who was reasonably competent, so I'm wondering if it's a shortcut I didn't know about.

 

 

[Darkie Minotaur]

llListenRemove needs the handle, not the channel - at least to my knowledge - but you can easily test it to make sure - I can't go on right now.

[Rolig Loon]

That's a mistake. It's pretty clear on the wiki: llListenRemove takes the callback number as its argument, not the channel.

[Innula Zenovka]

Thanks, both.  That confirms what I thought.   It just looked so odd, I wondered if it was a clever trick I'd never seen before.

[Void Singer]

oh I wish we could do something like that... unfortunately it'd cause massive conflicts as is with the integer based handles we get now.... some scheme like that could work if the listen handle spit out keys, and they put in some logic to close all the KEY handles with matching channels when listen remove got an integer.... I doubt such a setup will ever occur though