set linux system time from Qt

bao

2011-03-30 11:24:22

How can I change the system time from a Qt application?

I can change that by hwclock from terminal, but I want to provide a GUI for
user.

Thanks

Simon

2011-03-31 19:56:05

I do it by calling

   sprintf(buf, "/bin/date -s %04d.%02d.%02d-%02d:%02d", year, month, day,
hour, min);
   system(buf);
   system("/sbin/hwclock -w");

... in my user-pressed-the-ok-button slot. Seems to work well enough :)

Ajiesh

2013-07-17 13:23:13

If I execute the hwclock command I get the  error message as 'Only
superuser can change the system time' can you please give solution

davef

2013-07-17 14:03:21

Which machine are you running this on?  What kernel are you using?

Can you browse and edit files in root without putting in a password?

Juergen Beisert

2013-07-18 09:38:56

Ajiesh,

sure. Only the root user can change system settings. Its a feature, not a
bug ;) -> "man sudo"

Ajiesh

2013-09-18 14:57:32

How to become a root user........... I have to change the date and time for
phytec board AM335x...... it is possible to change by using qt
programming..........

foru

2013-09-23 08:23:24

#ifndef SETTING_H
#define SETTING_H
#include"formula.h"

#include <QWidget>
#include"dialog.h"
#include<QLineEdit>
#include<QLabel>
class setting : public QDialog
{
public:
    setting();
    class formula *main_class;
    QLineEdit *offset;
    QLineEdit *multiplier;
    QLineEdit *timeinterval;
    QLabel *off;
    QLabel *mul;
    QLabel *time;

    QPushButton *Apply;
    QPushButton *close;

  public slots:
    void done_value();

};


#include "setting.h"
setting::setting()
{
main_class = new formula();
    offset = new QLineEdit;
    multiplier = new QLineEdit;
    timeinterval = new QLineEdit;

    off = new QLabel("OffSet       :");
    mul = new QLabel("Multiplier   :");
    time = new QLabel("TimeInterval:");

    QHBoxLayout *h1 = new QHBoxLayout;
    h1->addWidget(off);
    h1->addWidget(offset);
    QHBoxLayout *h2 = new QHBoxLayout;
    h2->addWidget(mul);
    h2->addWidget(multiplier);
    QHBoxLayout *h3 = new QHBoxLayout;
    h3->addWidget(time);
    h3->addWidget(timeinterval);
    Apply = new QPushButton("Apply");
    close = new QPushButton("Close");
    QHBoxLayout *but = new QHBoxLayout;
    but->addWidget(Apply);
    but->addWidget(close);

    QFont font ;

    font = off->font();
    font.setPointSize(30);
    off->setFont(font);

    font = off->font();
    font.setPointSize(30);
    mul->setFont(font);

    font = off->font();
    font.setPointSize(30);
    time->setFont(font);
    QVBoxLayout *final = new QVBoxLayout;
    final->addLayout(h1);
    final->addLayout(h2);
    final->addLayout(h3);
    final->addLayout(but);
    setLayout(final);
    QObject::connect(Apply,SIGNAL(clicked()),this,SLOT(done_value()));
    QObject::connect(close,SIGNAL(clicked()),this,SLOT(close()));
}
void setting::done_value(){

        float f;
        QString  line1 =offset->text();
        QTextCodec *codec =QTextCodec::codecForName("KOI8-R");
        QByteArray byte1 =codec->fromUnicode(line1);
        main_class->c = byte1.toFloat();

        QString  line2 =multiplier->text();
        QByteArray byte2 =codec->fromUnicode(line2);
        main_class->m = byte2.toFloat();

        QString  line3 =timeinterval->text();
        QByteArray byte3 =codec->fromUnicode(line3);


       main_class-> timeinterval = byte3.toFloat();


    this->hide();
}


Error:Object::connect: No such slot QDialog::done_value()