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Thread: How to manipulate a text in QTextEdit

  1. #1
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    Question How to manipulate a text in QTextEdit

    Hi folk!
    I'm trying to make a program to manipulate a text in a QTextEdit and show it after changes in the QTextEdit again. the first problem is that I'm completely newbie. the data is this:

    Qt Code:
    1. 00000000000000000000000000000000FEFFFF01FEFFFF03FFFFFF07FFFFFF070F0080070F0080070F0080070F0080070F0080070F0080070F0080070F0080070F0080070F0080070F0080070F0080070F0080070F0080071F00C007FFFFFF07FFFFFF03FEFFFF03FCFFFF010000000000000000000000000000000000000000
    2. 00000000000000000000000000000000FFFFFF07FFFFFF07FFFFFF07FFFFFF07000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
    3. 000000000000000000000000000000000FE0FF070FF0FF070FF0FF070FF0FF070FF880070FF880070FF880070FF880070FF880070FF880070FF880070FF880070FF880070FF880070FF880070FF880070FF880070FF880070F788007FF7F8007FF7F8007FE3F8007FC1F80070000000000000000000000000000000000000000
    4. 000000000000000000000000000000000FF880070FF880070FF880070FF880070FF880070FF880070FF880070FF880070FF880070FF880070FF880070FF880070FF880070FF880070FF880070FF880070FF880070FF880070FF8C007FFFFFF07FFFFFF07FEFFFF03FCFFFF010000000000000000000000000000000000000000
    5. 00000000000000000000000000000000FF3F0000FF7F0000FF7F0000FF7F0000007800000078000000780000007800000078000000780000007800000078000000780000007800000078000000780000007800000078000000780000FFFFFF07FFFFFF07FFFFFF07FFFFFF070000000000000000000000000000000000000000
    6. 00000000000000000000000000000000FF3F8007FF7F8007FF7F8007FF7F80070F7880070FF880070FF880070FF880070FF880070FF880070FF880070FF880070FF880070FF880070FF880070FF880070FF880070FF880070FF8C0070FF0FF070FF0FF070FF0FF030FC0FF010000000000000000000000000000000000000000
    7. 00000000000000000000000000000000FCFFFF01FEFFFF03FFFFFF07FFFFFF070FF880070FF880070FF880070FF880070FF880070FF880070FF880070FF880070FF880070FF880070FF880070FF880070FF880070FF880070FF8C0070FF0FF070FF0FF070FF0FF030FC0FF010000000000000000000000000000000000000000
    8. 000000000000000000000000000000000F0000000F0000000F0000000F0000000F0000000F0000000F0000000F0000000F0000000F0000000F0000000F0000000F0000000F0000000F0000000F0000000F0000000F0000001F000000FFFFFF07FFFFFF07FEFFFF07FCFFFF070000000000000000000000000000000000000000
    9. 00000000000000000000000000000000FCFFFF01FEFFFF03FFFFFF07FFFFFF070FF880070FF880070FF880070FF880070FF880070FF880070FF880070FF880070FF880070FF880070FF880070FF880070FF880070FF880071FF8C007FFFFFF07FFFFFF07FEFFFF03FCFFFF010000000000000000000000000000000000000000
    10. 00000000000000000000000000000000FC3F8007FE7F8007FF7F8007FF7F80070F7880070FF880070FF880070FF880070FF880070FF880070FF880070FF880070FF880070FF880070FF880070FF880070FF880070FF880070FF8C007FFFFFF07FFFFFF03FEFFFF03FCFFFF010000000000000000000000000000000000000000
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    the scenario is this:
    When I put the data(above data) in the QTextEdit and push the button, the program put this string ",0x" after each 8 character. somthings like this:


    Qt Code:
    1. 000000000,0x000000000,0x00000000,0x0000000F,0xEFFFF01F,0xEFFFF03F,...
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    and show it on the QTextEdit.(replace)

    I need to a simple guidance.

  2. #2
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    Default Re: How to manipulate a text in QTextEdit

    That's not really related to QTextEdit, just basic string manipulation.
    http://doc.qt.io/qt-5/qstring.html#insert

    Cheers,
    _

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

    Ryan111 (29th March 2015)

  4. #3
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    Default Re: How to manipulate a text in QTextEdit

    Quote Originally Posted by anda_skoa View Post
    That's not really related to QTextEdit, just basic string manipulation.
    http://doc.qt.io/qt-5/qstring.html#insert

    Cheers,
    _
    Thanks!
    that works but not correctly! look:



    as you can see, after several insert, it cannot put ",0x" string anymore. why? the code is this:

    Qt Code:
    1. void MainWindow::on_pushButton_clicked()
    2. {
    3. QString txt = ui->textEdit->toPlainText();
    4.  
    5. for (quint32 t = 0 ; t <= (txt.size()/8) ; t = t+11 )
    6. {
    7. txt.insert( t , QString(",0x"));
    8.  
    9. }
    10.  
    11. ui->textEdit->setText(txt);
    12. }
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  5. #4
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    Default Re: How to manipulate a text in QTextEdit

    Qt Code:
    1. for (quint32 t = 0 ; t <= (txt.size()/8) ; t = t+11 )
    2. {
    3. txt.insert( t , QString(",0x"));
    4.  
    5. }
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    You are comparing the count of characters (stored in "t" and moved by 11 positions on each iteration) with the number of "octets" in the string. The former will always be greater and the loop will end sooner than you expect.
    Look at this simple example with the string "0123456789abcdef" (16 chars):

    iteration 0:
    t=0, string = "0123456789abcdef"
    t <= 2 ? true

    iteration 1:
    t=11, string = ",0x0123456789abcdef"
    t <= (19/8) ? false


    IMHO this would be a lot easier this way:
    Qt Code:
    1. QString txt = ui->textEdit->toPlainText();
    2. while (txt.isEmpty()==false) {
    3. tmp << txt.left(8);
    4. txt.remove(0,8);
    5. }
    6. ui->textEdit->setText(tmp.join(",0x"));
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  6. The following user says thank you to stampede for this useful post:

    Ryan111 (29th March 2015)

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