UDID

[Kitty Hello]

Apple will reject apps that use platforminfo$("ID").
Should I change the return value to an app-specific value?

[spacefractal]

as I wrote in a previous tread, I think you should use OpenUdid for that PlatformInfo to been save.

[bigsofty]

I noticed a lot of apps have started to release updates that state they no longer collect UDID. There's a problem with legality on collecting this type of information without permission I believe.

[Kitty Hello]

Yes. It's not alowed to track users across different apps.

[ampos]

I use platforminfo$ to get device ID, then encode and save it on .ini files, so I can store that this device has, for example, bought the full app. We need a unique device ID; if not, copying this .ini file to any other device will "register" the app...

Oh, and I think 2 of my apps has been approved doing so, and when the policy was there.

[Hark0]

I vote for MAC ADDRESS too.

[Kitty Hello]

I thonk about writing an rnd() to a hidden file in appdata?

[spacefractal]

rnd() is not good at all, its wont been device unique, so OpenUDID is still the best alternative.

[Kitty Hello]

OpenUDID uses CFUUIDCreate for iOs, which is sort of rnd() (a bit comes from current hardware status as well (time, gps position and so on...)

So, I think I will go this route.

[edit]
My ID would be: B3E3DF8E088D864F640E303F86ABF68E. It seems very unique. I used a method as in Windows GUID creation.

[Kitty Hello]

uh-oh! What happens if a user uninstalls an app (on mobile platforms, only) and reinstalls it - the ID will be lost then. On desktops, the id will be system-wide the same and stay there until a reinstall of the OS.
So, in order to restore "purchases" or something, this would be bad.

Is that a problem?

[spacefractal]

I don't think it's a problem since restore purchases is iTunes account based. Its possible to restore purchases on all devices that is tied to same account. So its not udid based.

You can't do a workaround without some sort of account If you want id the user today.