checking if CVar exists - WoWInterface
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05-26-19, 03:54 PM   #1
A Deviate Faerie Dragon
Join Date: Apr 2018
Posts: 13
checking if CVar exists

Yo, I've been looking for a while and I haven't found something. I simply want to check if a cvar actually exists in case some get removed before Classic release. The following example produces an error if the cvar doesnt exist:

function setcvarifexists(cvar, value)
if GetCVarDefault(cvar) then SetCVar(cvar, value)
I'm looking for a replacement for GetCVarDefault(cvar) which just checks if the cvar exists.

EDIT: I'm also looking for a command to update all cvars similar to RestartGx(). For example the Timestamp setting will only load after reloading ui.

Last edited by CrittenxD : 05-26-19 at 06:56 PM.
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05-26-19, 07:57 PM   #2
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Have you tried just using SetCVar and use the return value and the event if necessary to continue the code process.


The other option is to use the static variable NUM_LE_EXPANSION_LEVELS that is set to 1 for Classic and use that as a guide for Classic based functionality access and make any necessary changes using an if statement block, if you were hoping to have one source code base for both versions.
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05-26-19, 08:05 PM   #3
A Deviate Faerie Dragon
Join Date: Apr 2018
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I'm getting an error as soon as im calling SetCvar or GetCvarDefault with a nonexisting CVar. "Couldn't find a CVar named 'xdtest'".
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05-26-19, 08:56 PM   #4
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You can use pcall() to capture the error and prevent it from being raised. If an error occurs, it instead returns false plus the error message as a string. Otherwise, if successful, it returns true with the returns from the called function appended.
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Last edited by SDPhantom : 05-26-19 at 09:02 PM.
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05-27-19, 07:43 AM   #5
A Deviate Faerie Dragon
Join Date: Apr 2018
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Thank you very much for this great solution!

Lua Code:
  1. function setcvarifexists(cvar, value)
  2. if pcall(SetCVar, cvar, value) then
  3. else DEFAULT_CHAT_FRAME:AddMessage("|cffff0000Cvar not found: "..cvar)
  4. end
  5. end

Only one call, I'm super happy with that! Gonna look into the secure action button from my other thread now
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WoWInterface » Developer Discussions » Lua/XML Help » checking if CVar exists

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