CODEWITHSUNDEEP
moduleluacoronasdk
jadkins4
jadkins4

Reputation: 903

Corona sdk pass value from main.lua to external module

Here is a demo I modified to remove the module(..., package.seeall) statement. It works great, and I want to use the same idea in a Corona sdk project. I want to pass a value to an existing variable that I created in the demo. Thanks for any advice.

main.lua--------------------------------------------------

-- Load external library (should be in the same folder as main.lua)
local testlib = require("testlib")
testlib.testvar = 100 -- Trying to change the testvar value in external module

-- cache same function, if you call more than once
local hello = testlib.hello

-- now all future invocations are "fast"
hello()


-- This all works fine, but I need to change the value of testvar.

testlib.lua -----------------------------------------------------

local M = {}
local testvar = 0 -- I need to change the value of this variable as well as others later.
print("testvar=",testvar)

local function hello()
    print ("Hello, module")
end
M.hello = hello

return M

Upvotes: 0

Views: 530

Answers (1)

Kamiccolo
Kamiccolo

Reputation: 8497

In this case Your local testvar is private variable for Your module (testlib.lua).

You need to provide some setters/getters for that private variable.

Basic example would be adding this to Your testlib.lua:

function setter(new_val)
    test_var = new_val
end

function getter()
    return test_var
end

M.set = setter
M.get = getter

Now, You can use testlib.set("some new value..") and print(testlib.get()) in Your main.lua to operate the value of testvar variable.

Upvotes: 1

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