As I learn about LUA and Corona, I pick up tips all the time.
I may create a quick and dirty system for this myself (although to be fair, I havent had a look at Ego yet)

But heres a thought:

Global variables can be holding application state.
There will be several items needed.
(musicOn, currentFile, preferredMilkShakeFlavor)
That sounds like a table to me.

We already have a great way to load and save a table: search for JSON encode and decode on these forums.

So if we have a global table

_G.AppSettings = {}
We can add properties to that simply

_G.AppSettings["musicOn"] = true

Then you use JSON encode and save the lot to a single file on application suspend/exit

and you open it , use JSON decode to get all the values back when the application starts or resumes.

See if thats enough to get you started, and as I say, I may upload a module to handle this later, after I look at Ego and see if it isn't already doing something similar or better.

Hi Jeff472,

Yes, please give Ego a try and see how it performs. I don't know how to use it properly, so I can't say at present.

I have to admit I always search for the least labour intensive solution, so I'll likely wait for your verdict on Ego before delving into JSON encode and decode. That said, the concept you are putting forward sounds incredibly intriguing in a good way, perhaps curiosity will get the best of me, haha.

Much thanks,

Steven

edaabs, no worries - it's hard to learn some of this at first.

You don't create the txt file and put it in your project folder - it's actually saved in the application support folder for Corona.

What you'd do if you wanted to save the value as on would be;

saveFile ("musicSettings.txt", on")

Then you could load it like;

music = loadFile ("musicSettings.txt")

Then music would = on.

Did you open ego.lua? It's got a few little examples in there :)

Let me know how you go, can try to help with some sample code later if you are still having issues.

Peach :)

Hi Peach,

Yes, I hate to say it, but still I'm still having issues. My event listener now looks like this:

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function toggleMusicButton(event)
                if(event.phase == "ended") then
                        if musicOn_btn.isVisible == true then
                        musicOff_btn.isVisible = true
                        musicOn_btn.isVisible = false;
                        saveFile( "musicSettings.txt", false)
                        else
                        musicOff_btn.isVisible = false
                        musicOn_btn.isVisible = true;
                        saveFile( "musicSettings.txt", true)
                        end
                end
                _G.musicIsOn  = musicOn_btn.isVisible           
        end

Ive just uploaded some sample code in the 'Share your code' section, called Load and Save defaults/ preferences.

Basically, I create a global table called
_G.lobal

The global variables are added to that table, and then are available using syntax like this:

_G.lobal.currentScore = 9

As long as you call saveDefaults() when the app suspends or shuts down, and loadDefaults() when it resumes or starts, the rest is totally invisible

Using that system, the code above would become:

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function toggleMusicButton(event) if(event.phase == "ended") then   musicOn_btn.isVisible = not(_G.lobal.musicSettings)   musicOff_btn.isVisible = _G.lobal.musicSettings   _G.lobal.musicSettings = not(_G.lobal.musicSettings)   end end

Hi jeff472,

Sounds simple enough:) I'm going to to take a look at your sample and see if I can apply it to my code. I'll let you know how things go.

Thank you!

Steven

Let me know how you get on.
I remember the other dat finding that reading numbers from a text file didnt always trigger the LUA coersion between number and text.
The same may be true of 'true'

If so, you might find it trying to set a value to the text value "true" instead of the boolean true.

I have an idea how to handle that transparently too, but it will have to wait for the weekend if so.

views:2262 update：2012/1/9 8:53:30