Difference between revisions of "LlSay"

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(Undo revision 1178790 by Strife Onizuka (Talk) - Still applies; most TPVs have a negative channel hack, LL viewers still don't.)
m (Updated description to note that viewers have been able to speak on negative channels for some months, note related bug)
(6 intermediate revisions by 5 users not shown)
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|constants
|constants
|caveats=
|caveats=
*Text spoken can only be heard within 20 meters of the speaking prim (rather than the root). This is contrary to how the event [[listen]] works, where a message can only be heard by any prim in the object if and only if the root prim is capable of hearing it.
*{{LSLP|msg}} can only be heard within 20 meters of the speaking prim (rather than the root). This is contrary to how the event [[listen]] works, where a {{LSLP|msg}} can only be heard by any prim in the object if and only if the root prim is capable of hearing it.
*Text can be a maximum of 1024 bytes. This can convey 1024 ASCII characters, or 512 UTF-8 characters such as á
*{{LSLP|msg}} can be a maximum of 1024 bytes. This can convey 1024 ASCII characters, or 512 UTF-8 characters such as <code>á</code>.
*A prim can '''not''' hear itself, this to prevent problems with recursion. It can however hear other prims within the same object.
*A prim can '''not''' hear itself, this to prevent problems with recursion. It can however hear other prims within the same object.
|examples=
|examples=
For better readability of your code, you can make use of certain mnemonic constants such as [[PUBLIC_CHANNEL]] instead of channel 0 and [[DEBUG_CHANNEL]] instead of channel +2,147,483,647.
<source lang="lsl2">
<lsl>
default
default
{
{
     state_entry()
     state_entry()
     {
     {
        // PUBLIC_CHANNEL has the integer value 0
         llSay(0, "Hello, Avatar!");
         llSay(PUBLIC_CHANNEL, "Hello, Avatar!");
     }
     }
}
}
</lsl>
</source>
To avoid making your object spam its neighborhood, use [[llInstantMessage]], [[llOwnerSay]] or [[llRegionSayTo]].
To avoid making your object spam its neighborhood, use [[llInstantMessage]], [[llOwnerSay]] or [[llRegionSayTo]].
|helpers
|helpers
Line 34: Line 32:
|also_functions=
|also_functions=
{{LSL DefineRow||[[llListen]]|Ask for listen events}}
{{LSL DefineRow||[[llListen]]|Ask for listen events}}
{{LSL DefineRow||[[llInstantMessage]]|Sends chat to the owner only (or to some other user only) to avoid spamming the {{#var:PUBLIC_CHANNEL}}}}
{{LSL DefineRow||[[llInstantMessage]]|Sends chat to the owner only (or to some other user only) to avoid spamming the [[PUBLIC_CHANNEL]]}}
{{LSL DefineRow||[[llOwnerSay]]|Sends chat to the owner only to avoid spamming the PUBLIC_CHANNEL}}
{{LSL DefineRow||[[llOwnerSay]]|Sends chat to the owner only to avoid spamming the [[PUBLIC_CHANNEL]]}}
{{LSL DefineRow||[[llRegionSay]]|Sends chat region wide}}
{{LSL DefineRow||[[llRegionSay]]|Sends chat region wide}}
{{LSL DefineRow||[[llRegionSayTo]]|Sends chat region wide to a specific avatar, or their attachments, or to a rezzed object of known UUID}}
{{LSL DefineRow||[[llRegionSayTo]]|Sends chat region wide to a specific avatar, or their attachments, or to a rezzed object of known UUID}}
Line 44: Line 42:
{{LSL DefineRow||[[Hello Avatar]]}}
{{LSL DefineRow||[[Hello Avatar]]}}
|notes=
|notes=
* Channel {{HoverText|0|Zero}} is the {{#var:PUBLIC_CHANNEL}}. Everyone can hear chat transmitted on this channel. All other channels are private channels (not sent to users, with the exception of {{#var:DEBUG_CHANNEL}}).
* Channel {{HoverText|0|Zero}} is the [[PUBLIC_CHANNEL]]. Everyone can hear chat transmitted on this channel. All other channels are private channels (not sent to users, with the exception of [[DEBUG_CHANNEL]]).
* Consider using llInstantMessage, llOwnerSay, or the {{#var:DEBUG_CHANNEL}} for debugging purposes. If {{#var:DEBUG_CHANNEL}} is used as {{LSLP|channel}}, the script will say {{LSLP|msg}} to the Script Warning/Error window.  
* Consider using [[llInstantMessage]], [[llOwnerSay]], or the [[DEBUG_CHANNEL]] for debugging purposes. If [[DEBUG_CHANNEL]] is used as {{LSLP|channel}}, the script will say {{LSLP|msg}} to the Script Warning/Error window.  
* If one object 'says' something to another object (''e.g''., a button that, when touched, turns on a lamp), it is a good idea to use a very negative channel, ''e.g.'', -5243212 but don't just use any number take a look at the [[User-Defined Protocols & APIs]] and choose one that won't interfere with other protocols. If you are going to sell your script widely please add it to the appropriate [[LSL_Protocol#Known_negative_chat_channels|known chat channels list]] so others won't interfere with your product (do keep in mind you should build your product so that it handles interference appropriately).
* If one object 'says' something to another object (''e.g''., a button that, when touched, turns on a lamp), it is a good idea to use a very negative channel, ''e.g.'', <code>-5243212</code> but don't just use any number take a look at the [[User-Defined Protocols & APIs]] and choose one that won't interfere with other protocols. If you are going to sell your script widely please add it to the appropriate [[LSL_Protocol#Known_negative_chat_channels|known chat channels list]] so others won't interfere with your product (do keep in mind you should build your product so that it handles interference appropriately).
<lsl>
<source lang="lsl2">
     llSay(-5243212,"turn on");
     llSay(-5243212,"turn on");
</lsl>
</source>
Negative channels are popular for script communications because the standard SL client is unable to chat directly on those channels ("/-xxxx message" won't chat "message" on channel "-xxxx", it will chat "/-xxxx message" on channel zero). The only way to do so prior to [[llTextBox]] was to use [[llDialog]] which was limited to 24 bytes.
From at least September 2016 (see [[Release Notes/Second Life Release/4.0.9.320038]]), viewers have been able to chat on negative channels, although chat is [https://jira.secondlife.com/browse/BUG-41541 limited to 254 characters]. Negative channels have been popular for script communications because the standard SL client was unable to chat directly on those channels (<code>/-xxxx message</code> would not chat <code>message</code> on channel <code>-xxxx</code>). The only way for a viewer to generate chat on negative channels prior to [[llTextBox]] was to use [[llDialog]] which was limited to 24 bytes.
|cat1
|cat1
|cat2
|cat2
|haiku={{Haiku|Oh say, can you see?|Can you see what I say if|You're not far away?}}
|cat3
|cat3
|cat4
|cat4
}}
}}

Revision as of 16:25, 5 July 2017

Summary

Function: llSay( integer channel, string msg );

Says the text supplied in string msg on channel supplied in integer channel.

• integer channel – output chat channel, any integer value
• string msg – message to be transmitted
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

  • Messages sent on channel zero[1] and DEBUG_CHANNEL are throttled to a rate of <200/10sec, per region, per owner/user.
    • Once the rate is exceeded, all following messages on channel zero or DEBUG_CHANNEL will be dropped until the send rate is again below 200/10sec for the previous 10 sec. Dropped messages, despite being dropped still count against the limit.
  • msg can only be heard within 20 meters of the speaking prim (rather than the root). This is contrary to how the event listen works, where a msg can only be heard by any prim in the object if and only if the root prim is capable of hearing it.
  • msg can be a maximum of 1024 bytes. This can convey 1024 ASCII characters, or 512 UTF-8 characters such as á.
  • A prim can not hear itself, this to prevent problems with recursion. It can however hear other prims within the same object.
All Issues ~ Search JIRA for related Bugs

Examples

default
{
    state_entry()
    {
        llSay(0, "Hello, Avatar!");
    }
}
To avoid making your object spam its neighborhood, use llInstantMessage, llOwnerSay or llRegionSayTo.

Notes

  • Channel 0 is the PUBLIC_CHANNEL. Everyone can hear chat transmitted on this channel. All other channels are private channels (not sent to users, with the exception of DEBUG_CHANNEL).
  • Consider using llInstantMessage, llOwnerSay, or the DEBUG_CHANNEL for debugging purposes. If DEBUG_CHANNEL is used as channel, the script will say msg to the Script Warning/Error window.
  • If one object 'says' something to another object (e.g., a button that, when touched, turns on a lamp), it is a good idea to use a very negative channel, e.g., -5243212 but don't just use any number take a look at the User-Defined Protocols & APIs and choose one that won't interfere with other protocols. If you are going to sell your script widely please add it to the appropriate known chat channels list so others won't interfere with your product (do keep in mind you should build your product so that it handles interference appropriately).
    llSay(-5243212,"turn on");

From at least September 2016 (see Release Notes/Second Life Release/4.0.9.320038), viewers have been able to chat on negative channels, although chat is limited to 254 characters. Negative channels have been popular for script communications because the standard SL client was unable to chat directly on those channels (/-xxxx message would not chat message on channel -xxxx). The only way for a viewer to generate chat on negative channels prior to llTextBox was to use llDialog which was limited to 24 bytes.

See Also

Events

•  listen                 – Receives chat

Functions

•  llListen – Ask for listen events
•  llInstantMessage – Sends chat to the owner only (or to some other user only) to avoid spamming the PUBLIC_CHANNEL
•  llOwnerSay – Sends chat to the owner only to avoid spamming the PUBLIC_CHANNEL
•  llRegionSay – Sends chat region wide
•  llRegionSayTo – Sends chat region wide to a specific avatar, or their attachments, or to a rezzed object of known UUID
•  llShout – Sends chat limited to 100 meters
•  llWhisper – Sends chat limited to 10 meters

Articles

•  Hello Avatar

Deep Notes

Search JIRA for related Issues

Footnotes

  1. ^ Channel zero is also known as: PUBLIC_CHANNEL, open chat, local chat and public chat

Signature

function void llSay( integer channel, string msg );

Haiku

Oh say, can you see?
Can you see what I say if
You're not far away?

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