[Closed] Detect callbacks

No, it shows only the General Callbacks registered using callbacks.addScript().

Yes, it can create and destroy them. However, it’s only to capture events – not to expose existing callbacks. Unfortunately, I don’t think any of the others have proper methods to show which callbacks (change handlers, etc.) exist.

That said…
general event callbacks

callbacks.show()

-- sample output
systemPostReset:
  id:#vfb_rollouts, "VFB_methods_struct.Reset()"
systemPreNew:
  id:#cbNewSysReset, "px_preNewFile()"

change handlers

apropos ":changeHandler"

-- sample output
myChangeHandler (ChangeHandler): <ChangeHandler:0x0000e1e8>

Unfortunately, this doesn’t help you remove it (the ID is not reported), but it may help you find its source, which may lead to finding a way to remove it.

node event system (callback itself)

apropos ":nodeeventcallback"

-- sample output
fixScale (NodeEventCallback): NodeEventCallback

You can remove the node event callback by setting the variable name to undefined, then running a garbage collection.

[b]node event system/b
time change callback
viewport redraw callback

-- run before you load your scene/script/etc. (I have it in startup)
standardFunctions = stringStream ""
apropos "*:maxscriptfunction" to:standardFunctions
standardFunctions = filterString (standardFunctions as string) "
"

-- load your scene/script/etc. here
-- function foobar = ( print "foo, bar!" )

-- run after you load your scene / script file / etc.
currentFunctions = stringStream ""
apropos "*:maxscriptfunction" to:currentFunctions
currentFunctions = filterString (currentFunctions as string) "
"
for func in currentFunctions where (findItem standardFunctions func == 0) do (
	format "%
" func
)

-- sample output
foobar (MAXScriptFunction): foobar()

For time and viewport redraw callbacks, you can use the function name to unregister them. You’ll have to do some guessing as to whether a function is a callback or not, though. With any luck, coders you work with / whose products you use, use some sane naming methods for this.

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Haven’t poked much at this, there might be some other tricks left in max’s arsenal to help here.