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  1. #1
    Regular Contributor
    Join Date
    Apr 2008
    Posts
    57

    How to read Hex values in a txt file ?

    Hello,

    I have got a problem for reading datas in a txt file (Nokia 6131). I explain.
    My txt file contains thist :
    Code:
    a032
    010203040506
    Now I've created an InpoutStream and I try to read the datas like hexadecimal values. It means that for the first value I want a0, next is 32, then 01, etc
    Code:
    InputStream fileData = getClass().getResourceAsStream("/data/lafon.txt");
    DataInputStream dataIn = new DataInputStream(fileData);
    Now I'm lost. I tried to read 2 bytes (with dataIn.readByte()) and set the most significant bits with the 1 byte read, and the least with the second byte. But I didn't succeed.


    Could someone help me please.

  2. #2
    Registered User
    Join Date
    Jul 2007
    Posts
    14

    Re: How to read Hex values in a txt file ?

    Hi,
    I think your .txt file has an \r\n after 32.
    and notice that in txt file the char is stored in its ascii code (if isn't unicode).
    then you must get byte, then convert its ascii to hexa aquivalent.

  3. #3
    Regular Contributor
    Join Date
    Apr 2008
    Posts
    57

    Re: How to read Hex values in a txt file ?

    You're right there is a \r\n but I can delete it, it could me more easier.
    The problem is that I don't succcess to convert for example the a to its hexadecimal value 0x0a nor a0 to 0xa0.

  4. #4
    Registered User
    Join Date
    Jul 2007
    Posts
    14

    Re: How to read Hex values in a txt file ?

    Hi,
    after you ensured that file isn't unicode, and you can get bytes one by one, check this:

    int ch=0;char hex;
    if((ch = is.read())>-1)
    switch(ch){
    case 48:hex='0';
    case 49:hex='1';
    case 50:hex='2';
    case 51:hex='3';
    //...to 57: hex='9';
    case 97:hex='a';
    case 98:hex='b';
    //..to 102: hex='f'
    }

  5. #5
    Regular Contributor
    Join Date
    Apr 2008
    Posts
    57

    Re: How to read Hex values in a txt file ?

    The solution you gave me doesn't work for my case. But thanks anyway.

    I finally succeed byte using an array and doing some calculations.

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