WoW:API UnitCastingInfo

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Returns information on the spell currently cast by the specified unit. Returns nil if no spell is being cast.

spell, rank, displayName, icon, startTime, endTime, isTradeSkill = UnitCastingInfo("unit")

Parameters

Arguments

unit

String - The UnitId to query (e.g. "player", "party2", "pet", "target" etc.)

Returns

spell

String - The name of the spell, or nil if no spell is being cast.

rank

String - The string describing the rank of the spell, e.g. "Rank 1".

displayName

String - The name to be displayed.

icon

String - The texture path associated with the spell.

startTime

Number - Specifies when casting has begun, in milliseconds.

endTime

Number - Specifies when casting will end, in milliseconds.

isTradeSkill

Boolean - Specifies if the cast is a tradeskill

Example

local spell, _, _, _, _, endTime = UnitCastingInfo("player")
if spell then 
 local finish = endTime/1000 - GetTime()
 ChatFrame1:AddMessage(spell .. ' will be finished casting in ' .. finish .. ' seconds.')
end

Result

If you're currently casting Shadowbolt:

Shadowbolt will be finished casting in 1.234 seconds.

Details

For channeled spells, displayName is "Channeling".

Not sure if displayName ever differs from spell in any other contexts.

As of May 10, 2008, this does not return anything while casting Hellfire, Drain Life, or Rain of Fire with my warlock. The correct API for channeled spells is UnitChannelInfo. It takes the same arguments and returns the same values, but is specific to channeled spells.