Listen

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/LSL

listen

Description

Event: listen( integer channel, string name, key id, string message ){ ; }

12	Event ID
	Delay

Triggered by chat, use llListen to enable and filter

• integer	channel
• string	name
• key	id
• string	message

Channel Constant		Description
DEBUG_CHANNEL	0x7FFFFFFF	Chat channel reserved for script debugging and error messages, broadcasts to all nearby users.
PUBLIC_CHANNEL	0x0	Chat channel that broadcasts to all nearby users. This channel is sometimes referred to as: open chat, local chat and public chat.

Caveats

• On state change or script reset all listens are closed automaticaly.
• When an object changes owner any listen registered with llGetOwner will not automatically update itself until the script is reset. The scripter can catch this scenario per the example below.
• If a message satisfies the filters of multiple llListens registered by the script, only one event will be raised.
• A prim cannot hear/listen to chat it generates.
• The location of the listen is not at the listening prim's location but at the root prim's location. This is to deter people using child prims for spying over parcel boundaries. Chat generating functions on the other hand generate chat at the calling prim's location (and not at the root prim's location).

Examples

Trivial example to listen to any chat from the object owner and respond once. To reduce lag and avoid spamming surrounding users, it is vastly preferable to listen on channels other than 0 and to trigger the listen event by chatting on an alternative channel such as '/5 hello'. <lsl>// says beep to owner the first time owner says something in main chat; integer listen_handle;

default {

   state_entry()
   {   //Registers the listen to the owner of the object at the moment of the call. This does not automatically update when the owner changes.
       // Change 0 to another positive number to listen for '/5 hello' style of chat.
       listen_handle = llListen(0, "", llGetOwner(), "");
   }
   listen( integer channel, string name, key id, string message )
   {
       llOwnerSay("beep");
       // Stop listening until script is reset
       llListenRemove(listen_handle);
   }
   on_rez(integer param)
   {   //Triggered when the object is rezed, like after the object had been sold from a vendor
       llResetScript();//By resetting the script on rez it forces the listen to re-register.
   }
   changed(integer mask)
   {   //Triggered when the object containing this script changes owner.
       if(mask & CHANGED_OWNER)
       {
           llResetScript();
       }
   }

}</lsl>

See Also

Functions

•	llListen
•	llListenControl
•	llListenRemove
•	llDialog
•	llOwnerSay	–	Sends chat to the owner only to avoid spamming the PUBLIC_CHANNEL
•	llWhisper	–	Sends chat limited to 10 meters
•	llSay	–	Sends chat limited to 20 meters
•	llShout	–	Sends chat limited to 100 meters
•	llRegionSay	–	Sends chat limited to region

Deep Notes

Signature
event void listen( integer channel, string name, key id, string message );