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Thread: Extract data from a file

  1. #1
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    Default Extract data from a file

    Hi All,
    Im trying to accomplish the following task and would like some advice.

    I have a file with some content I need to extract partial information that are found in a specific position. For instance in this file I have the following:

    //SOME DATA BEFORE THE POINT I WANT TO EXTRACT

    then at some point it starts the section where I want to get the data; it starts where it says !- === SHADING..etc

    !- =========== SHADING:ZONE: DETAILED ===========
    Shading:Zone: Detailed,
    Shading Device1,
    BUFFERSUD,
    ,
    4,
    0.2,
    -0.8,
    1.6,
    0.8,
    -0.8,
    2.8,
    0.8,
    -0.0,
    2.8,
    0.2,
    0.0,
    1.6;
    Shading:Zone: Detailed,
    Shading Device2,
    BUFFERSUD,
    ,
    4,
    0.8,
    -0.8,
    2.8,
    2.06,
    -0.81,
    2.96,
    2.0,
    -0.0,
    2.8,
    0.8,
    0.0,
    2.8;

    ..... etc. etc..

    Basically I want to store all numbers after the the 4. They are coordinates of some points. 12 altogether so 4 points. Most lilely I want to store them them in an array of length [3].
    My trouble are
    1) how do I start reading data from a specific point ? (basically after =========== SHADING:ZONE: DETAILED ===========)
    2) How do I fetch data so that I select in a sequence only the 12 points (exclduing so the first 5 rows)
    3) I need to repeat this until all sequence is ended. The sequence of the data I need to gather finish at a point where I have this string: !- =========== ALL OBJECTS IN CLASS: PEOPLE ===========)

    How would you approach this?


  2. #2
    Super Moderator Sean4u's Avatar
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    Default Re: Extract data from a file

    You'll have to read that file line-by-line until you detect the start of the lines you want to acquire, and then add them to your program data structure. The file looks like a sequential text file, so you can't really 'start reading' at any particular place, you'll have to go from the start.

  3. #3
    mmm.. coffee JavaPF's Avatar
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    Default Re: Extract data from a file

    Might be worth looking at - http://www.javaprogrammingforums.com...ner-class.html
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