Hi all, I see in many lua file that have defined function like OnCreate, OnGotTarget, OnWeaponFired,... then I tried to make a new function named TestFunction in unit's lua file:

Ehh, the problem is that moho log didn't print "This function can run, yeah!" string so I think my TestFunction isn't run by game engine. Why original game's function is run but my function? Is it defined by game engine? Is there anyway to execute my TestFunction?(I don't want to use ForkThread or self:TestFunction() script). Thank you

yeah sure,

when you define a new function in the units script you have to call the function
by using

self:TestFunction()

and the msg will be put in your LOG

remember though if the function is in a units script.. ONLY that unit can call that function because its local to that unit, if you put it in a defaultunits.lua class the function will only be available to that unit type class, if you put it in unit.lua it will be available to all units

Very detail . I see, thank you

Uhm, I'm very confused. I don't know which script I should use: pairs or ipairs or nothing in order to loop into a table. For example: I can use:



also:



or:



I've read lua manual but I don't understand it. Could you explain to me? Which script do you guys usually use?
Thank in advance

Use ipairs when your tables use numbers, use regular pairs when they don't. This is important because one will only read numbers and the other doesn't read numbers at all.

In SupCom's Lua, if you don't use one of the above the engine will assume you meant one and put it in for you. I can't remember which though.

which ever one you use,

the one like this is universal



i will always key or index and v will always contain the value(s)

if the value is a table then inside the loop a value can be returned with

v.key

.. from the above code you can prolly isotane what you need to do to get the values you require..

however there is also another usefull function for finding a value in a table.

table.find(table, value)

say we have a table like so..

table = { 'i', 'want', 'to', 'find', 'a', 'value' }

this is a numerically numbered table.. (even though we cant see the numbers)

we can use



which will return the value (true) or nil (false)

id just go with the first one...

Regular pairs.

Specifically, in Supreme Commander then



is exactly equivalent to



ipairs has very little use, unless you're definitely treating a table like an array, which is rare in Lua.

Hi all,
After a hard working day, I'm very tired but fell happy when read your reply. Nice work, mate. Thank you

One more question: I read the lua tutorial but didn't find any script that remove or delete some letters in a string. For example, I want to remove "Left" word in "Bone_Left" string to get only "Bone" word.

Look for

string.sub( )
string.gsub( )

you can use these 2 to parse strings

I already used string.sub(), it's ok.

I tried string.gsub() but got no expectation return.
For example, I want to remove the last 5 letters:


I got s1 string same as s string.

if s = 'xxx_unit then
s1 = string.gsub(s, "_unit", "", 1)

will remove everything after that, from the first instance and return xxx.

if s = 'xxx_unit_unit then

s1 = string.gsub(s, "_unit", "", 2)

would return xxx_unit

we can also use string.sub in this way

if s = 'xxx_unit then

s1= string.sub(s, 1, -5)

which would also return xxx

but also

s1= string.sub(s, 4, -1)

would leave _unit


but also, i use this..

local position = string.find(s, "_")
local unitid = string.sub(s, 1, position-1)
local leftover = string.sub(s, position+1, -1)

which gives

unitid = xxx
leftover = _unit

Nice work, mate. It could be much better now, haha.
Do you know which version of lua that game engine used? I usually test my script in lua 5.1.4. Is it OK?

They use a customized 5.0.2, or something like that. But all Lua 5 is pretty close. 5.2 did some funky stuff with envs but that's it.

I see, thank you