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Find and replace

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  • V Offline
    V Offline
    Vidhya
    wrote on last edited by
    #1

    @
    QString filename = "xxx.txt";
    QFile file(filename);
    if (!file.open(QIODevice::ReadOnly | QIODevice::Text))
    {
    return;
    }
    QTextStream in(&file);
    QStringList line;
    while (!in.atEnd())
    {
    line.append(in.readLine());
    }
    QString lineedit =line.at(1);
    qDebug()<<lineedit;
    lineedit.replace("Vidhya","Nithya");
    qDebug()<<lineedit;

    file.close(); @
    

    Here the text is changed but it is not reflected in the file .
    how will i achive this.

    Regards,
    Vidhya

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    0
    • K Offline
      K Offline
      KA51O
      wrote on last edited by
      #2

      What do you think does this do ?
      @
      file.open(QIODevice::ReadOnly | QIODevice::Text)
      @

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      0
      • V Offline
        V Offline
        Vidhya
        wrote on last edited by
        #3

        i gave QIODevice::ReadWrite also but its not working

        Regards,
        Vidhya

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        0
        • K Offline
          K Offline
          KA51O
          wrote on last edited by
          #4

          This part is replacing something in a QString variable (QString lineedit) and not in your QFile or QTextStream.
          @
          lineedit.replace("Vidhya","Nithya");
          @
          and you do not write the changes you did to this lineedit variable to your file or textstream anywhere.

          Also before posting a question like this, that is very likely to have been asked before, try "searching the forum":http://qt-project.org/search?search=replace+text+in+file for "existing threads":http://qt-project.org/forums/viewthread/6203 on this issue.

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          • D Offline
            D Offline
            David_Gil
            wrote on last edited by
            #5

            Hi!

            As KA510 says, you're opening the file as ReadOnly.

            Besides, your line

            @QTextStream in(&file);@

            could be better understood as

            @QTextStream reader(&file);@

            AFAIK (which is not much) what you need is something that 'writes' to that or another file:

            @QTextStream writer(&anotherFile);
            //...
            QString lineedit =line.at(1);
            lineedit.replace("Vidhya","Nithya");
            writer << lineedit;
            @

            I hope it (somewhat) helps!

            David Gil

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            • V Offline
              V Offline
              Vidhya
              wrote on last edited by
              #6

              Thank for ur reply i achieved it by writing the result to the another file thank for ur help

              Regards,
              Vidhya

              1 Reply Last reply
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