combining QTime with QLCD

thomasGl

Hello guys. How can i combine the time with my QLCD? I can display the lcd but it does not run. I want the time to run up to 6 minutes from 0.

#include "lcduuuuu.h"

lcduuuuu::lcduuuuu(QWidget *parent):QLCDNumber(parent)
{

    this->setGeometry(150,150,150,150);
    this->setDigitCount(5);
    this->display("00:00");


    timee = new QTime(0,6,0); //time

    timerCount = new QTimer(this); //timer
    


    QObject::connect(timerCount, &QTimer::timeout,this,&lcduuuuu::timerCountSlot);



}

void lcduuuuu::timerCountSlot()
{

    timee->addMSecs(360);
    timerCount->start(1000);
}

SGaist

Hi,

In your code you don't start the timer.

thomasGl

QObject::connect(timerCount, &QTimer::timeout,this,&lcduuuuu::timerCountSlot); timerCount->start(1000);

I put it in my constructor but still, why i dont understand. I created a timer.

SGaist

You realize that you don't update the content of your QLCDNumber subclass in that slot ?

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.
    }



}

JonB

@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.

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

JonB

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

thomasGl

Yes, i want an int=6;

JonB

@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?

thomasGl

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

JonB

@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).

thomasGl

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

JonB

@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?

thomasGl

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

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.

JonB

@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?

thomasGl

thx i got it.