Check if cast spell

[ToShuk Marusenko]

i try to  check if player cast spell, and i have this message if i cast of any spells

function Oncast(event, player, spell, skipCheck)
if(player:IsCasting(10912) == true) then
print "IS CASTING"
end

end

RegisterPlayerEvent(5, Oncast)

why ? i need that message is print if a cast 10912 spell id

[Rochet2]

If I understood right, you are trying to check if the spell being cast is 10912.
It seems the example code you have posted tries to use player:IsCasting(10912) to check if the player is casting the spell entry.
However as you can see from the documentation it takes no arguments and cannot check if a specific spell entry is being casted. http://www.elunaengine.com/Unit/IsCasting.html

What we suggest you do is to check if the entry of the spell parameter is what you want. You can use http://www.elunaengine.com/Spell/GetEntry.html
Here is an example:
 

function Oncast(event, player, spell, skipCheck)
    if spell:GetEntry() == 10912 then
        print "IS CASTING 10912"
    end
end
RegisterPlayerEvent(5, Oncast)