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Thread: how to retrieve ascii code of a character in a qstring?

  1. #1
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    Default how to retrieve ascii code of a character in a qstring?

    I'm trying to write an application with Qt 5.4, and I have to encode a string in code 128 barcode.
    So, the first character in the original string is byte 205 (Í):
    dummy is an int, risposta is the QString to encode

    dummy = (char) risposta.at(ind).toLatin1();

    dummy, in debug mode, becomes -51, and so, it makes me break following
    if (dummy < 127)
    dummy -= 32;
    else
    dummy -= 100;
    Anyone can help me?
    Gisac

  2. #2
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    Default Re: how to retrieve ascii code of a character in a qstring?

    If you want an intepretation as an unsigned number, use an unsigned type.

    Cheers,
    _

  3. The following user says thank you to anda_skoa for this useful post:

    gisac (26th May 2015)

  4. #3
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    Default Re: how to retrieve ascii code of a character in a qstring?

    Unfortunately, if I declare
    uint dummy;
    and make:
    dummy=(char)risposta.at(ind).toLatin1();
    or
    dummy=(uint)risposta.at(ind).toLatin1();
    dummy becomes 4294967245!
    Help me, please!
    Thanks

  5. #4
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    Default Re: how to retrieve ascii code of a character in a qstring?

    Qt Code:
    1. dummy=(unsigned char)risposta.at(ind).toLatin1();
    To copy to clipboard, switch view to plain text mode 

  6. The following user says thank you to Lesiok for this useful post:

    gisac (26th May 2015)

  7. #5
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    Default Re: how to retrieve ascii code of a character in a qstring?

    Just made! It's the same thing, dummy=-51 also with (unsigned char)!

  8. #6
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    Default Re: how to retrieve ascii code of a character in a qstring?

    Quote Originally Posted by gisac View Post
    Just made! It's the same thing, dummy=-51 also with (unsigned char)!
    Actually, there is a strange behavior of qcreator: in the variable window, dummy continues to have the value -51, but in the following if it is considered to have value 205.
    Problem solved! thanks to all!

  9. #7
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    Default Re: how to retrieve ascii code of a character in a qstring?

    You know that these are the basics of C / C ++? It has nothing to do with Qt.

  10. #8
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    Default Re: how to retrieve ascii code of a character in a qstring?

    Try this:

    string s = "hallo world";
    foreach( char c in s)
    {
    Console.WriteLine(System.Convert.ToInt32(c));
    }
    Console.ReadLine();

  11. #9
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    Default Re: how to retrieve ascii code of a character in a qstring?

    And just what does Java code have to do with either C++ or Qt?

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