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combining QTime with QLCD

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  • T thomasGl

    Hi, i am getting weird jumps from 0 to 8 i dont understand...... . I want to count to 60 in one step

    #include "mainwindow.h"
    
    MainWindow::MainWindow(QWidget *parent)
        : QMainWindow(parent)
    {
    
    
    
        QLCDNumber* lcd= new QLCDNumber(this);
    
    
        QObject::connect(timer,&QTimer::timeout,this,&MainWindow::displaySeconds);timer->start(1000);
    
    
    
    }
    
    
    void MainWindow::displaySeconds()
    {
        if(counter<=60)
        {
            counter++;
            qDebug()<<counter;    //that works in one step
            lcd->display(counter);  //that does not.
        }
    
    
    
    }
    
    
    JonBJ Offline
    JonBJ Offline
    JonB
    wrote on last edited by JonB
    #6

    @thomasGl
    The code you show cannot work. In the slot you access lcd variable, but in MainWindow::MainWindow you show QLCDNumber* lcd= new QLCDNumber(this); which is a local variable so it cannot be that QLCDNumber.

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    • T Offline
      T Offline
      thomasGl
      wrote on last edited by
      #7

      hello, is there a method to convert that string into a int? I can make two lcdnumbers with int num1; and int num2; but maybe there is a way to dispaly only 1 lcdnumber with 2 numbers.

        num1->display("06:00");  //display that as an int   
      
      JonBJ 1 Reply Last reply
      0
      • T thomasGl

        hello, is there a method to convert that string into a int? I can make two lcdnumbers with int num1; and int num2; but maybe there is a way to dispaly only 1 lcdnumber with 2 numbers.

          num1->display("06:00");  //display that as an int   
        
        JonBJ Offline
        JonBJ Offline
        JonB
        wrote on last edited by
        #8

        @thomasGl
        How do you want to convert the string 06:00 to an int --- what value would you want?

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        • T Offline
          T Offline
          thomasGl
          wrote on last edited by
          #9

          Yes, i want an int=6;

          JonBJ 1 Reply Last reply
          0
          • T thomasGl

            Yes, i want an int=6;

            JonBJ Offline
            JonBJ Offline
            JonB
            wrote on last edited by
            #10

            @thomasGl
            So you want the first number in the string, and ignore the :00? So if you want to convert a QString to a number did you look in the QString Class documentation and search for number?

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            • T Offline
              T Offline
              thomasGl
              wrote on last edited by
              #11

              yeah i want the :00 also. I will look in the documentation and hope to understand.

              JonBJ 1 Reply Last reply
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              • T thomasGl

                yeah i want the :00 also. I will look in the documentation and hope to understand.

                JonBJ Offline
                JonBJ Offline
                JonB
                wrote on last edited by JonB
                #12

                @thomasGl said in combining QTime with QLCD:

                Yes, i want an int=6;
                yeah i want the :00 also.

                :) If you want to get at the 00 you could use QString::mid(3), or you could QString::split(":") to get the 06 and the 00 as separate strings.

                I don't understand what you are trying to do with a string and parsing it, though. And one QLCDNumber can only display one int value, so I don't know what you are trying to do with two ints....

                Let's restart with the title of this topic. So you want to display some kind of current time, or elapsed timer ("I want the time to run up to 6 minutes from 0"), as an LCD clock like e.g. 01:23? Then you should start with example Digital Clock Example. That seems to show the current clock time (QTime::currentTime()). Sounds like you want a QElapsedTimer instead (QElapsedTimer::elapsed() returns milliseconds).

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                • T Offline
                  T Offline
                  thomasGl
                  wrote on last edited by
                  #13

                  Ok thx. I will make it with two QLCDNumber. I thought i can do that with one QLCDNumber and two integer.

                  JonBJ 1 Reply Last reply
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                  • T thomasGl

                    Ok thx. I will make it with two QLCDNumber. I thought i can do that with one QLCDNumber and two integer.

                    JonBJ Offline
                    JonBJ Offline
                    JonB
                    wrote on last edited by
                    #14

                    @thomasGl
                    But that is so sad when I gave you the example code which does what you want with one QLCDNumber! Did you even look at it?

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                    • T Offline
                      T Offline
                      thomasGl
                      wrote on last edited by thomasGl
                      #15

                      QString::mid(3), or you could QString::split(":") i will try that yes

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                      • T Offline
                        T Offline
                        thomasGl
                        wrote on last edited by
                        #16

                        Hello. What are the parameters of SegmentStyle(); and digitCount();

                        lcd->SegmentStyle(flat);   //does not work and 2 also
                        lcd->digitCount(2)  //does not work
                        

                        the documentation says QLCDNumber::Flat is 2 but that does not work .
                        And digitCount needs an int but that does not work either.

                        JonBJ 1 Reply Last reply
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                        • T thomasGl

                          Hello. What are the parameters of SegmentStyle(); and digitCount();

                          lcd->SegmentStyle(flat);   //does not work and 2 also
                          lcd->digitCount(2)  //does not work
                          

                          the documentation says QLCDNumber::Flat is 2 but that does not work .
                          And digitCount needs an int but that does not work either.

                          JonBJ Offline
                          JonBJ Offline
                          JonB
                          wrote on last edited by
                          #17

                          @thomasGl said in combining QTime with QLCD:

                          What are the parameters of SegmentStyle(); and digitCount();

                          Use the documentation to discover exactly this, that's what it's there for.

                          • There is no such method as QLCDNumber::SegmentStyle(), so it won't compile. Nor is flat a recognised value or variable.
                          • QLCDNumber::digitCount() does not accept any parameter, and does not set the digit count anyway.

                          lcd->digitCount(2) //does not work

                          Instead of just typing this in and wondering why it does not work and how to do it, why not go back to your code in your very first post here. Doesn't that have a statement setting the digit count to 5?

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                          • T Offline
                            T Offline
                            thomasGl
                            wrote on last edited by
                            #18

                            thx i got it.

                            1 Reply Last reply
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