I want to use two timers to update graphics on the screen. I have two timers. The first is connected to a slot to change the graphic every 150ms and repeat after 10 iterations. The second is to simulate the completion of internal tests every 2 seconds.
There are a couple of problems which I cannot solve. They are in the Dialog module.
1. My timer->stop(); command crashes the program with a “SIGSEGV” segmentation fault.
2. My timer2 seems to count up in steps of two rather than one. It skips every second one of the graphics that I give it to display. With the debugger I can stop the code in each state of test but it does not display the graphic.
Could I get some advice please?
Regards,
James
Here is the Dialog module
#include <QtGui>
#include <QDialog>
#include <QLabel>
#include <QDebug>
#include <QTimer>
#include "dialog.h"
#include "ui_dialog.h"
#include "probe.h"
Dialog::Dialog(QWidget *parent) :
QDialog(parent),
ui(new Ui::Dialog)
{
Dialog::setWindowFlags(Qt::SplashScreen); // no decoration on the screen
ui->setupUi(this);
// Set up the rolling logo timer
QTimer *timer = new QTimer(this);
connect(timer, SIGNAL(timeout()), this, SLOT(state_update()));
timer->start(150);
// Set up the test results timer
QTimer *timer2 = new QTimer(this);
connect(timer2, SIGNAL(timeout()), this, SLOT(results_update()));
timer2->start(2000);
}
void Dialog::state_update()
{
static int counter=0;
switch (counter)
{
case 1:
ui->label->setPixmap(QPixmap(":/logo/logo1.jpg",0,Qt::AutoColor));
break;
case 2:
ui->label->setPixmap(QPixmap(":/logo/logo2.jpg",0,Qt::AutoColor));
break;
case 3:
ui->label->setPixmap(QPixmap(":/logo/logo3.jpg",0,Qt::AutoColor));
break;
case 4:
ui->label->setPixmap(QPixmap(":/logo/logo4.jpg",0,Qt::AutoColor));
break;
case 5:
ui->label->setPixmap(QPixmap(":/logo/logo5.jpg",0,Qt::AutoColor));
break;
case 6:
ui->label->setPixmap(QPixmap(":/logo/logo6.jpg",0,Qt::AutoColor));
break;
case 7:
ui->label->setPixmap(QPixmap(":/logo/logo7.jpg",0,Qt::AutoColor));
break;
case 8:
ui->label->setPixmap(QPixmap(":/logo/logo8.jpg",0,Qt::AutoColor));
break;
case 9:
ui->label->setPixmap(QPixmap(":/logo/logo9.jpg",0,Qt::AutoColor));
break;
case 10:
ui->label->setPixmap(QPixmap(":/logo/logo10.jpg",0,Qt::AutoColor));
break;
}
if (++counter > 10) counter = 1;
}
void Dialog::results_update()
{
static int test = 0;
QString str;
switch (test)
{
case 0:
ui->label_Clk_Result->setPixmap(QPixmap(":/logo/Pass.jpg",0,Qt::AutoColor));
break;
case 1:
ui->label_USB_Result->setPixmap(QPixmap(":/logo/Pass.jpg",0,Qt::AutoColor));
break;
case 2:
ui->label_Probe_Result->setPixmap(QPixmap(":/logo/Pass.jpg",0,Qt::AutoColor));
break;
case 3:
ui->label_HV_Result->setPixmap(QPixmap(":/logo/Fail.jpg",0,Qt::AutoColor));
break;
case 4:
ui->label_LV_Result->setPixmap(QPixmap(":/logo/Pass.jpg",0,Qt::AutoColor));
break;
case 5:
break;
case 6:
timer->stop();
// timer2->stop();
Probe *j = new Probe();
j->showMaximized();
this->close();
break;
}
test++;
str = QString("Test = %1").arg(test);
ui->label_test->setText(str);
}
Dialog::~Dialog()
{
delete ui;
}
void Dialog::on_buttonBox_accepted()
{
qApp->quit();
}
Here is the Main module
#include "dialog.h"
#include "probe.h"
#include <QApplication>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
Dialog w;
Dialog Probe;
w.show();
return a.exec();
}
Here is the Probe module
#include "probe.h"
#include "ui_probe.h"
Probe::Probe(QWidget *parent) :
QDialog(parent),
ui(new Ui::Probe)
{
Probe::setWindowFlags(Qt::SplashScreen); // no decoration on the screen
ui->setupUi(this);
}
Probe::~Probe()
{
delete ui;
}
void Probe::on_buttonBox_accepted()
{
qApp->quit();
}
Here is Dialog.h
#ifndef DIALOG_H
#define DIALOG_H
#include <QDialog>
#include <QtGui>
namespace Ui {
class Dialog;
}
class Dialog : public QDialog
{
Q_OBJECT
public:
explicit Dialog(QWidget *parent = 0);
~Dialog();
private slots:
void on_buttonBox_accepted();
void state_update();
void results_update();
private:
Ui::Dialog *ui;
QDialogButtonBox *buttonBox;
QTimer *timer;
QTimer *timer2;
signals:
};
#endif // DIALOG_H
Here is Probe.h
#ifndef PROBE_H
#define PROBE_H
#include <QDialog>
namespace Ui {
class Probe;
}
class Probe : public QDialog
{
Q_OBJECT
public:
explicit Probe(QWidget *parent = 0);
~Probe();
private slots:
void on_buttonBox_accepted();
private:
Ui::Probe *ui;
};
#endif // PROBE_H
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