Please note that as of October 24, 2014, the Nokia Developer Wiki will no longer be accepting user contributions, including new entries, edits and comments, as we begin transitioning to our new home, in the Windows Phone Development Wiki. We plan to move over the majority of the existing entries. Thanks for all your past and future contributions.

Revision as of 01:23, 11 October 2012 by hamishwillee (Talk | contribs)

(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)

Deactivate NVC connection to NFC Tag type 4 before closing to avoid app crash (Known Issue)

From Wiki
Jump to: navigation, search

This article provides a workaround to avoid application crashes when closing the connection to an NFC Tag Type 4 on Nokia Belle.

Article Metadata
Tested with
Devices(s): Nokia C7 (firmware FW 022.013 and FW022.014)
Created: mahbub_s60 (06 Feb 2012)
Last edited: hamishwillee (11 Oct 2012)



When an NFC tag is lost/separated from the device a handler should be called to close the connection. Due to a bug in the NFC implementation on Nokia Belle, we need to first deactivate the connection before closing it, or the application will panic.

How to produce the bug

  1. Implement your code to handle the tag lost event as below. Note that this is the correct way to handle the event:
    void CNfcHandler::TagLost() 
    delete iIso14443Connection;
    iIso14443Connection = 0;
  2. Run the application
  3. Touch an NFC tag type 4 to the device (for example, a Nokia C7) and then remove it

The NFC app is closed due to a panic (Symbian unexpected exception).


The following code can be used to workaround this crash on Nokia Belle:

void CNfcHandler::TagLost() 
if(iIso14443Connection->IsActivated()) {
delete iIso14443Connection;
iIso14443Connection = 0;

Device SW used to test

  • C7 with FW 022.013 and FW022.014

Note, this is tracked internally as "Failure 880652: [mcl]NFC 3rd party application crashes"

This page was last modified on 11 October 2012, at 01:23.
59 page views in the last 30 days.