Time count and display it

[rockon209]

Hello Everyone,

How to show in a QTextEdit that how much time is passed after a pushbutton is pressed. Bascially i want to count time in min and second after a button is pressed and show it live. I know i have to use Qtimer but how to show it live.

Thanks in advance

[VRonin]

header

private:
QElapsedTimer m_elTim;
QPushButton* m_startButton;
QTimer* m_intervalClock;
QTimeEdit* m_liveCounter;

source

m_startButton=new QPushButton("Start",this);
m_liveCounter = new QTimeEdit(this);
m_intervalClock=new QTimer(this);
connect(m_startButton,&QPushButton::clicked,this,[this](){m_elTim.start();});
connect(m_intervalClock,&QTimer::timeout,this,[this](){if(m_elTim.isValid()) m_liveCounter->setTime(QTime(0,0).addMSecs(m_elTim.elapsed()));});
m_intervalClock->start(500);

[rockon209]

@VRonin thanks for reply but i want to display the time in a QtExtEdit and also the startbutton has other function also. HOw to do this?

[J.Hilk]

@rockon209

You can convert QTime to a QString easy enough with QTime::toString(const QString &format) const

And to connect your button to multiple Slots just add an other connect:

connect(m_startButton,&QPushButton::clicked,this,[this](){m_elTim.start();});
...
connect(m_startButton,&QPushButton::clicked, receiver1, &SLOT1);
connect(m_startButton,&QPushButton::clicked, receiver2, &SLOT2);
...
...
connect(m_startButton,&QPushButton::clicked, receiverX, &SLOTX);

Edit: Fixed missing ,

[rockon209]

I am geting the following error when i run the code

field 'm_elTim' has incomplete type 'QElapsedTimer'
QElapsedTimer m_elTim;
^

[mrjj]

@rockon209 said in Time count and display it:

QElapsedTimer

Did you you type
#include <QElapsedTimer>
?

[J.Hilk]

@rockon209
you're missing some includes,

in this case add:

#include <QElapsedTimer>

[rockon209]

yes i have already included it in source file, but still the same error

[VRonin]

@rockon209 said in Time count and display it:

in source file

That should go in the header file

[rockon209]

@VRonin but when i include it in header file my application crashes

[VRonin]

@rockon209 said in Time count and display it:

my application crashes

That's not due to the #include could you post your code?

[rockon209]

main.cpp

#include "watch.h"
#include <QApplication>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    watch w;
    w.show();

    return a.exec();
}

watch.cpp

#include "watch.h"


watch::watch(QWidget *parent) :
    QWidget(parent)

{

    m_startButton=new QPushButton("Start",this);
    m_liveCounter = new QTimeEdit(this);
    m_intervalClock=new QTimer(this);
    connect(m_startButton,&QPushButton::clicked,this,[this](){m_elTim.start();});
    connect(m_intervalClock,&QTimer::timeout,this,[this](){if(m_elTim.isValid()) m_liveCounter->setTime(QTime(0,0).addMSecs(m_elTim.elapsed()));});
    m_intervalClock->start(500);
    QBoxLayout* mainLayout = new QHBoxLayout();
    mainLayout->addWidget(m_startButton);
    mainLayout->addWidget(m_liveCounter );
    setLayout(mainLayout);
}

watch.h

#ifndef WATCH_H
#define WATCH_H

#include <QWidget>
#include <QElapsedTimer>
#include <QPushButton>
#include <QTimeEdit>
#include <QTimer>
#include <QBoxLayout>
namespace Ui {
class watch;
}

class watch : public QWidget
{
    Q_OBJECT

public:
    explicit watch(QWidget *parent = 0);


private:
    QElapsedTimer m_elTim;
    QPushButton* m_startButton;
    QTimer* m_intervalClock;
    QTimeEdit* m_liveCounter;
};

#endif // WATCH_H

stopwatch.pro

QT       += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = stopwatch
TEMPLATE = app


SOURCES += main.cpp\
        watch.cpp

HEADERS  += watch.h

FORMS    += watch.ui

[VRonin]

Can't see anything obvious (but I might just be blind). could you post your stack trace at the moment of crash?

[J.Hilk]

ah,

in your watch.h add #include<QElapsedTimer> and in your watch.cpp intilize it with m_elTim = new QElapsedTimer(); it's missing from @VRonin code example

[VRonin]

@J.Hilk said in Time count and display it:

in your watch.cpp intilize it with m_elTim = new QElapsedTimer(); it's missing from @VRonin code example

It's on the stack so no need to do this. QElapsedTimer is not a QObject

[rockon209]

now the code is not crashing. everyting is running but when i push startbutton nothing happens

[VRonin]

@rockon209 said in Time count and display it:

now the code is not crashing.

What did you change?

[J.Hilk]

@VRonin said in Time count and display it:

It's on the stack so no need to do this. QElapsedTimer is not a QObject

You're right of course, I must have missed that...

[rockon209]

I create a new code just to check if everyting works fine and then i found out that when i click startbutton nothing happens

[rockon209]

ok sorry guys it working but its not showing the seconds only minute and hours how to change the format? to hh:mm:ss