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Securely posthooks the specified function. The hook will be called with the same arguments after the original call is performed.

hooksecurefunc([table,] functionName, hookfunc)


Optional Table - Table to hook the functionName key in; if omitted, defaults to the global table (_G).
string - name of the function being hooked.
function - your hook function.


The following calls hook CastSpellByName and GameTooltip:SetUnitBuff without compromising their secure status. When those functions are called, the hook prints their argument list into the default chat frame.

hooksecurefunc("CastSpellByName", print); -- Hooks the global CastSpellByName
hooksecurefunc(GameTooltip, "SetUnitBuff", print); -- Hooks GameTooltip.SetUnitBuff


  • This is the only safe way to hook functions that execute protected functionality.
  • hookfunc is invoked after the original function, and receives the same parameters; return values from hookfunc are discarded.
  • After this function is used on a function, setfenv() throws an error when attempted on that function
  • You cannot "unhook" a function that is hooked with this function except by a UI reload. Calling hooksecurefunc() multiple times only adds more hooks to be called.
  • Also note that using hooksecurefunc() may not always produce the expected result. Keep in mind that it actually replaces the original function with a new one (the function reference changes). For example, if you try to hook the global function "MacroFrame_OnHide" (after the macro frame has been displayed), your function will not be called when the macro frame is closed. It's simply because in Blizzard_MacroUI.xml the OnHide function call is registered like this:
<OnHide function="MacroFrame_OnHide"/>
The function ID called when the frame is hidden is the former one, before you hooked "MacroFrame_OnHide". The workaround is to hook a function called by "MacroFrame_OnHide":
hooksecurefunc(MacroPopupFrame, "Hide", MyFunction)
  • If you want to securely hook a frame's script handler, use Frame:HookScript:
MacroPopupFrame:HookScript("OnHide", MyFunction)