TapLinx SDK, TagWriter and TagInfo中的主题 Taplinx iOS - how to select application 0

Taplinx iOS - how to select application 0

DamianD — Fri, 08 Nov 2024 07:58:24 GMT

When using taplinx ios library i do following code:

TLLibraryManager.Shared.DESFireEV3Instance.SelectApplicationWithAppID(0, (success) => { if (success == false) { return; } TLLibraryManager.Shared.DESFireEV3Instance.GetApplicationIDsOnCompletion((bool success) => { });

With added logging in apduHandler i see what gets sent and returns from card. So for selection app with id 0 following bytes are sent: 5A000000 and returned 00 (which is correct), so in callback to selecting app i get success - however after that when i send api to get all application ids, nothing gets sent to card (no apdu command) and in device log i get following entries:

Time Device Name Type PID Tag Message Nov 7 22:58:16 iPhone Notice 5584 MobileFacilityApp Caught an exception ( Nov 7 22:58:16 iPhone Notice 5584 MobileFacilityApp Exception Caught: com.nxp.nfclib.exceptions.UsageException: Application 0 must be selected when using getApplicationIDs()

1. Why is library not remembering that app with id 0 was already selected?

2. how to actually get that list of ids? declaration of that method:

- (void)getApplicationIDsOnCompletion:(completionBlockWithResult)completion;

states that it only returns BOOL determinig of action was success or not - how do i get back the actual list of applications?

Re: Taplinx iOS - how to select application 0

Shilpa_G — Tue, 20 Jan 2026 07:32:50 GMT

Do you get any solution to it or resolved it?

I am also facing this issue,I have used TapLinxLibrayv2.3.0 iOS lib and using swift6. I checked declaration of getApplicationIDsOnCompletion and it returns bool. so How to check if any application (other than PICC level [0x00]) exists or not?

(void)getApplicationIDsOnCompletion:(completionBlockWithResult)completion;

Also tried to solve using "selectApplication(withAppID: targetAppID)" to check if it exists or not. but this will respond with error code A0 (Application not found). so do not want to handle it like this..

so please If anyone can help here , it would be great.

Re: Taplinx iOS - how to select application 0

EduardoZamora — Wed, 18 Mar 2026 23:02:42 GMT

Hi,

Please make sure you are using the latest version available of TapLinx iOS SDK. Also, please refer to Starting development with TapLinx iOS SDK [UG10045], Chapter 5 for the MIFARE DESFire architecture.

Regards,
Eduardo.