MohoDoc:CountLayers()

An example of its use is:

local i
local doc = moho.document
local ct = doc:CountLayers()

for i = 0, ct-1 do
	local layer = doc:Layer(i)	
	Print (layer:Name())
end

This prints the names of all the top level layers (i.e. it does not print the names of layers contained in group type layers)


Note also that it is possible to avoid the use of local variables for ct and the MohoDoc and MohoLayer classes thus:

local i
for i = 0, moho.document:CountLayers()-1 do	
	Print (moho.document:Layer(i):Name())
end

This is more compact, but if the program needs to make many references to (e.g.) data items within Layer(i) the first option layer = doc:Layer(i) is preferable.