How to make a Printscreen on level Up

[Catastophe]

Hi,

I want to keep a diary of my WoW run and thought it would be funny to have a printscreen everytime I level up.

I try to make an (very simple) addon for this but the Screenshot is giving me some headache.

Can anyone tell me what I have done wrong or point me in the right direction?

When I use

local Congrats_EventFrame = CreateFrame("Frame")
Congrats_EventFrame:RegisterEvent("PLAYER_LEVEL_UP")
Congrats_EventFrame:SetScript("OnEvent",
    function(self, event, ...)
	    local arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8, arg9 = ...
		print(Congratulations on reaching level ' ..arg1.. ', ' .. UnitName("Player").. '! You gained ' ..arg2.. ' HP and ' ..arg3.. ' MP!') 
	end)

It works.

So I thought about adding the printscreen function like this:

local Congrats_EventFrame = CreateFrame("Frame")
Congrats_EventFrame:RegisterEvent("PLAYER_LEVEL_UP")
Congrats_EventFrame:SetScript("OnEvent",
    function(self, event, ...)
	    local arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8, arg9 = ...
		print(Congratulations on reaching level ' ..arg1.. ', ' .. UnitName("Player").. '! You gained ' ..arg2.. ' HP and ' ..arg3.. ' MP!') 
	end)

Congrats_EventFrame:SetScript("OnEvent",
    function(self, event, ...)
	    local Screenshot
	end)

But that doesn't work.

So if someone could point me in the right direction that would be great