Difference between revisions of "LlGetLinkName"
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See llGetNumberOfPrims for more about counting prims and avatars.
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m (NULL_KEY is returned is link input is out of bounds.) |
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|func_id=145|func_sleep=0.0|func_energy=10.0 | |func_id=145|func_sleep=0.0|func_energy=10.0 | ||
|func=llGetLinkName | |func=llGetLinkName | ||
|return_type=string|p1_type=integer|p1_name=link | |return_type=string | ||
|p1_type=integer|p1_subtype=link|p1_name=link | |||
|func_footnote= | |func_footnote= | ||
|func_desc | |func_desc | ||
|return_text=that is the name of {{LSLP|link}} in link set | |return_text=that is the name of {{LSLP|link}} in link set | ||
|spec | |spec | ||
|caveats=*The prim name attribute is limited to 63 bytes, any string longer then that will be truncated. This truncation does not always happen when the attribute is set or read. | |caveats=*If '''link''' is out of bounds, NULL_KEY is returned. | ||
*The prim name attribute is limited to 63 bytes, any string longer then that will be truncated. This truncation does not always happen when the attribute is set or read. | |||
*There is no corresponding '''llSetLinkName''', use <code>llSetLinkPrimitiveParamsFast(link, [PRIM_NAME, name]);</code> instead. | *There is no corresponding '''llSetLinkName''', use <code>llSetLinkPrimitiveParamsFast(link, [PRIM_NAME, name]);</code> instead. | ||
|constants | |constants | ||
|examples=Listen on channel 10 for a name; check if a prim with that name is part of this object | |examples=Listen on channel 10 for a name; check if a prim with that name is part of this object | ||
< | <source lang="lsl2"> | ||
integer check_for_prim(string name) | integer check_for_prim(string name) | ||
{ | { | ||
| Line 42: | Line 44: | ||
} | } | ||
} | } | ||
}</ | }</source> | ||
|helpers= | |helpers= | ||
< | <source lang="lsl2">integer getLinkWithName(string name) { | ||
integer i = llGetLinkNumber() != 0; // Start at zero (single prim) or 1 (two or more prims) | integer i = llGetLinkNumber() != 0; // Start at zero (single prim) or 1 (two or more prims) | ||
integer x = llGetNumberOfPrims() + i; // [0, 1) or [1, llGetNumberOfPrims()] | integer x = llGetNumberOfPrims() + i; // [0, 1) or [1, llGetNumberOfPrims()] | ||
| Line 51: | Line 53: | ||
return i; // Found it! Exit loop early with result | return i; // Found it! Exit loop early with result | ||
return -1; // No prim with that name, return -1. | return -1; // No prim with that name, return -1. | ||
}</ | }</source> | ||
|also_functions= | |also_functions= | ||
{{LSL DefineRow||[[llGetLinkKey]]|Gets the instance UUID of the link}} | {{LSL DefineRow||[[llGetLinkKey]]|Gets the instance UUID of the link}} | ||
Latest revision as of 09:39, 23 November 2017
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Caveats
- link needs to be either an actual link number or a link constants that equate to a single prim, such as LINK_ROOT and LINK_THIS.
- LINK_SET, LINK_ALL_CHILDREN and LINK_ALL_OTHERS will not work.
- If link is out of bounds, NULL_KEY is returned.
- The prim name attribute is limited to 63 bytes, any string longer then that will be truncated. This truncation does not always happen when the attribute is set or read.
- There is no corresponding llSetLinkName, use
llSetLinkPrimitiveParamsFast(link, [PRIM_NAME, name]);instead.
Examples
Listen on channel 10 for a name; check if a prim with that name is part of this object
integer check_for_prim(string name)
{
integer i = llGetNumberOfPrims();
for (; i >= 0; --i)
{
if (llGetLinkName(i) == name)
{
return TRUE;
}
}
return FALSE;
}
default
{
state_entry()
{
llListen(10, "", llGetOwner(), "");
}
listen(integer chan, string obj, key id, string msg)
{
if (check_for_prim(msg))
{
llOwnerSay("found a linked prim named \"" + msg + "\"");
}
else
{
llOwnerSay("this object does not have any linked prims named \"" + msg + "\"");
}
}
}
Useful Snippets
integer getLinkWithName(string name) {
integer i = llGetLinkNumber() != 0; // Start at zero (single prim) or 1 (two or more prims)
integer x = llGetNumberOfPrims() + i; // [0, 1) or [1, llGetNumberOfPrims()]
for (; i < x; ++i)
if (llGetLinkName(i) == name)
return i; // Found it! Exit loop early with result
return -1; // No prim with that name, return -1.
}
Notes
Link Numbers
Each prim that makes up an object has an address, a link number. To access a specific prim in the object, the prim's link number must be known. In addition to prims having link numbers, avatars seated upon the object do as well.
- If an object consists of only one prim, and there are no avatars seated upon it, the (root) prim's link number is zero.
- However, if the object is made up of multiple prims or there is an avatar seated upon the object, the root prim's link number is one.
When an avatar sits on an object, it is added to the end of the link set and will have the largest link number. In addition to this, while an avatar is seated upon an object, the object is unable to link or unlink prims without unseating all avatars first.
Counting Prims & Avatars
There are two functions of interest when trying to find the number of prims and avatars on an object.
llGetNumberOfPrims()- Returns the number of prims and seated avatars.llGetObjectPrimCount(llGetKey())- Returns only the number of prims in the object but will return zero for attachments.
integer GetPrimCount() { //always returns only the number of prims
if(llGetAttached())//Is it attached?
return llGetNumberOfPrims();//returns avatars and prims but attachments can't be sat on.
return llGetObjectPrimCount(llGetKey());//returns only prims but won't work on attachments.
}
Errata
If a script located in a child prim erroneously attempts to access link 0, it will get or set the property of the linkset's root prim. This bug (BUG-5049) is preserved for broken legacy scripts.
See Also
Functions
| • | llGetLinkNumber | – | Returns the link number of the prim the script is in. | |
| • | llGetLinkKey | – | Gets the instance UUID of the link | |
| • | llGetObjectName | – | Get the prims name | |
| • | llSetObjectName | – | Set the prims name | |
| • | llGetObjectDesc | – | Get the prims description | |
| • | llSetObjectDesc | – | Set the prims description | |
| • | llGetObjectDetails |
Articles
| • | Limits | – | SL limits and constrictions | |
| • | Prim Attribute Overloading |