Display changes of integer variable to lcd number

[micmec]

Thanks for the reply..

Could you please show a simple code example..?
I'm still in the middle of learning the timer and process event because I never use it before..

[anda_skoa]

You have never called a method on a C++ object?

Syntax for a pointer is: objectVariable->methodName(argumentlist);

E.g.

QCoreApplication *app = QCoreApplication::instance();
app->processEvents();

QCoreApplication *app = QCoreApplication::instance();
app->processEvents();

To copy to clipboard, switch view to plain text mode 

or in one line

QCoreApplication::instance()->processEvents();

QCoreApplication::instance()->processEvents();

To copy to clipboard, switch view to plain text mode 

Cheers,
_

[micmec]

Sorry, but that's not what I meant . I mean some example of using it. Here is my code.

Monitor::Monitor(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::Monitor)
{
    ui->setupUi(this);
    QCoreApplication *app = QCoreApplication::instance();
 
    this->count=0;
    for(int i=0;i<100;i++){
        this->ui->lcdNumber->display(count);
        for(int j=0;j<5000000;j++){
 
        }
        this->count++;
        app->processEvents();
    }
}

Monitor::Monitor(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::Monitor)
{
    ui->setupUi(this);
    QCoreApplication *app = QCoreApplication::instance();

    this->count=0;
    for(int i=0;i<100;i++){
        this->ui->lcdNumber->display(count);
        for(int j=0;j<5000000;j++){

        }
        this->count++;
        app->processEvents();
    }
}

To copy to clipboard, switch view to plain text mode 

The truth is I have to make a monitoring program with Qt. My code just displays 99, not 0 to 99. Or is there another way to do monitoring with Qt?
Sorry if I'm too much asking...

[Lesiok]

What You are monitoring ? Using infinite loop probably is a bad design.
Perhaps as a result of the optimization for loop is not executed because it is empty and You don't see changes of lcdNumber.

PS
I think I know where the problem is. Show us a main() function. I suspect that You are trying to play with GUI in constructor of main widget before start QApplication.

[micmec]

This is my main function

#include "monitor.h"
#include <QApplication>
 
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    Monitor w;
    w.show();
 
    return a.exec();
}

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

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

    return a.exec();
}

To copy to clipboard, switch view to plain text mode 

Sorry if it's kind of embarassing because I'm still new to this. The programming languages that I have learned are just C and Java, but I'm still just a student so I just know the basics.

[stampede]

If your compiler is gcc and optimization is O2 (default for qmake generated Makefiles), your empty loop is removed for sure. I don't know about other compilers.
If you really want to see the cool effect of changing a number on lcd widget (which is apparently your only goal here), connect a timer with a non-zero timeout to a slot, in which you increment a variable by 1 and display it.