Reading wrong data Mifare Classic

[Manish]

I am using in my Android Studio

implementation ('taplinx-android:nxpnfcandroidlib:1.5@aar'){

        transitive = true

        changing = true

    }

I am using sample code for Mifare Reading and Writing opeartion.

I written data successfully in default sector of classic = 6. Also, I got data written successfully!!! message but when i read data from
the same sector I am getting 000000000000000000000 data. So my question how do i read and write data properly ?

I am using below code

        int blockTorw = 6;

        int sectorOfBlock;

        try {



            //Call connect first is the Reader is not connected

            if (!mifareClassic.getReader().isConnected()) {

                mifareClassic.getReader().connect();

            }



            sectorOfBlock = mifareClassic.blockToSector(blockTorw);



            if (is_write) {

                /** write data to block **/

                mifareClassic.writeBlock(blockTorw, Consts.DATA.getBytes());

            } else {

               

                /** read data from block **/

                byte[] default_ff_key = {(byte) 0xFF, (byte) 0xFF, (byte) 0xFF, (byte) 0xFF, (byte) 0xFF, (byte) 0xFF};

                mifareClassic.authenticateSectorWithKeyA(sectorOfBlock, default_ff_key);

                data = mifareClassic.readBlock(blockTorw);

                String str = Utilities.dumpBytes(data);

            }

        } catch (Exception e) {

            logger.debug("Classic tag error: " + e.getMessage());

        }

Attached screenshots for more details

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[TapLinx Support]

Hi Manish,

In a different post I explained that you have an error in your code.

The TapLinx team

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[Manish]

Yes I got you. Thanks

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