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Revision as of 13:07, 21 February 2012 by hamishwillee (Talk | contribs)

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

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

Article Metadata
Tested with
Devices(s): Nokia C7 (firmware FW 022.013 and FW022.014)
Compatibility
Platform(s):
Symbian
Article
Created: mahbub_s60 (06 Feb 2012)
Last edited: hamishwillee (21 Feb 2012)

Contents

Introduction

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 Symbian 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() 
    {
    iTag->CloseConnection(*iIso14443Connection);
    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).

Workaround

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

void CNfcHandler::TagLost() 
{
if(iIso14443Connection->IsActivated()) {
iIso14443Connection->Deactivate();
}
iTag->CloseConnection(*iIso14443Connection);
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"

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