Re: Using full userdata as table index?
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- Subject: Re: Using full userdata as table index?
- From: "Huang, Wallace" <whuang@...>
- Date: 2004年2月10日 10:01:47 -0800
>> Could you possibly be more specific about the problem?
Yes--just didn't want to flood a bunch of code onto the list before I
knew it should work. :)
-- prints contents of a table for debugging purposes
function printtable( aTable )
print( "@@@@@@@@@@@@@@@@" )
for i, v in pairs( aTable ) do
print( i, v )
end
print( "@@@@@@@@@@@@@@@@" )
end
-------------------------------------------
Basically, I want to use a userdata object as the index for a lookup
table of strings.
-- Setup the lookup table.
function SetupTable()
tObject2String = {}
for count, stringID in pairs( tStrings ) do
-- return a numeric id to the actor object
local obj = Utility_GetActor( stringID )
-- associate it with a string
tObject2String[obj] = stringID
-- this is how I want to use the table later,
-- and for now, this outputs the right information
print( '--> Adding ' .. tObject2String[obj] .. '\n' )
end
-- this prints out the contents of the table, and is also
correct
printtable( tObject2String )
end
OUTPUT
--> Adding targetVehicle1
--> Adding targetVehicle2
--> Adding targetVehicle3
--> Adding targetVehicle4
--> Adding targetVehicle5
@@@@@@@@@@@@@@@@
guid: 0x679676de targetVehicle1
guid: 0x44cfa3c6 targetVehicle3
guid: 0x33678cd6 targetVehicle5
guid: 0xf015e098 targetVehicle2
guid: 0x4f580514 targetVehicle4
@@@@@@@@@@@@@@@@
-------------------------------------------
However, when I try to lookup a value in the table, it returns nil.
I know that the table is unchanged since its creation and that the aObj
argument exists in the table. If I do a linear search of the
tObject2String table using aObj, I find the object. I also tried using
rawget and rawset to read/write values from the lookup table because I
thought the index metamethod might have been confused, but that did not
work either.
--look up the string and use it ...
function Lookup( aObj )
printtable( tObject2String )
local stringID = tObject2String[aObj]
print(aObj, stringID)
...
End
OUTPUT
@@@@@@@@@@@@@@@@
guid: 0x679676de targetVehicle1
guid: 0x44cfa3c6 targetVehicle3
guid: 0x33678cd6 targetVehicle5
guid: 0xf015e098 targetVehicle2
guid: 0x4f580514 targetVehicle4
@@@@@@@@@@@@@@@@
guid: 0x679676de nil