Difference between revisions of "LlReadKeyValue"
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|func_desc=Start an asynchronous transaction to read the value associated with the specified key and the specified experience. | |func_desc=Start an asynchronous transaction to read the value associated with the specified key and the specified experience. | ||
|func_footnote | |func_footnote | ||
|return_type=key | |return_type=key|return_subtype=handle | ||
| | |return_text=that can be used to identify the corresponding [[dataserver]] event to determine if this command succeeded or failed and the results. | ||
|p1_type=string|p1_name=k | |p1_type=string|p1_name=k | ||
|also_functions= | |also_functions= | ||
Revision as of 17:02, 9 July 2014
| LSL Portal | Functions | Events | Types | Operators | Constants | Flow Control | Script Library | Categorized Library | Tutorials |
Summary
Function: key llReadKeyValue( string k );
Start an asynchronous transaction to read the value associated with the specified key and the specified experience.
Returns a handle (a key) that can be used to identify the corresponding dataserver event to determine if this command succeeded or failed and the results.
| • string | k | – | The key for the key-value pair |
Specification
Dataserver
The dataserver callback parameters are:
- A key containing the handle returned from llReadKeyValue
- A string containing a comma-delimited list (cdl).
llDumpList2String([ integer success ] + components);- components vary depending upon success or failure of request.
- Failure:
cdl = llDumpList2String([ 0, integer error],",") - Success:
cdl = llDumpList2String([ 1, string value ],",")
String Components
| • integer | success | – | A boolean specifying if the transaction succeeded (1) or not (0). | |
| • integer | error | – | An XP_ERROR_* flag that describes why the operation failed. | |
| • string | value | – | The value for the key-value pair. Maximum 2047 characters, or 4095 if using Mono. Note! This value may contain commas. |
Caveats
Examples
<lsl>key trans; default {
state_entry()
{
trans = llReadKeyValue("FOO");
}
dataserver(key t, string value)
{
if (t == trans)
{
// our llReadKeyValue transaction is done
if (llGetSubString(value, 0, 0) == "1")
{
// the key-value pair was successfully read
llSay(0, "New key-value pair value: " + llGetSubString(value, 2, -1));
}
else
{
// the key-value pair failed to read
integer error = (integer)llGetSubString(value, 2, -1);
llSay(0, "Key-value failed to read: " + llGetExperienceErrorMessage(error));
}
}
}
}</lsl>