I made a program (a very beginner type program). When i compile it, the IDE keeps on Setting Break and never runs the program. I have checked the program, for me it has no errors. Any suggestions what to do.
Here is the Bobwindow.cpp
#include "bobwindow.h"
#include "ui_bobwindow.h"
#include "askdialog.h"
#include <QListWidgetItem>
BobWindow::BobWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::BobWindow)
{
ui->setupUi(this);
dialog= new AskDialog(this);
item= new QListWidget(this);
}
BobWindow::~BobWindow()
{
delete ui;
}
void BobWindow::on_actionAdd_Item_triggered()
{
dialog->show();
}
void BobWindow::showlist(QString &data)
{
QListWidgetItem *itm= new QListWidgetItem;
QFont fnt;
fnt.setFamily("Times");
fnt.setPointSize(18);
fnt.setItalic(true);
itm->setText(data);
itm->setSizeHint(QSize(0,25));
itm->setFont(fnt);
itm->setBackground(Qt::green);
itm->setIcon(QIcon(":/pics/goku3.jpg"));
item->addItem(itm);
item->setIconSize(QSize(15,15));
}
here is the Askdialog.cpp file
#include "bobwindow.h"
#include "askdialog.h"
#include "ui_askdialog.h"
AskDialog::AskDialog(QWidget *parent) :
QDialog(parent),
ui(new Ui::AskDialog)
{
ui->setupUi(this);
prog= new BobWindow;
}
AskDialog::~AskDialog()
{
delete ui;
}
void AskDialog::on_dokbutton_clicked()
{
ui->dokbutton->setEnabled(false);
ui->dokbutton->setDefault(true);
QString data=ui->dline->text();
prog->showlist(data);
}
here is askdialog.h file
#ifndef ASKDIALOG_H
#define ASKDIALOG_H
#include <QDialog>
class BobWindow;
namespace Ui {
class AskDialog;
}
class AskDialog : public QDialog
{
Q_OBJECT
public:
explicit AskDialog(QWidget *parent = 0);
void showdialog();
~AskDialog();
private slots:
void on_dokbutton_clicked();
private:
Ui::AskDialog *ui;
BobWindow *prog;
};
#endif // ASKDIALOG_H
here is Bobwindow.h file
#ifndef BOBWINDOW_H
#define BOBWINDOW_H
#include <QMainWindow>
#include <QListWidget>
#include "askdialog.h"
namespace Ui {
class BobWindow;
}
class BobWindow : public QMainWindow
{
Q_OBJECT
public:
explicit BobWindow(QWidget *parent = 0);
~BobWindow();
void showlist(QString &);
private slots:
void on_actionAdd_Item_triggered();
private:
Ui::BobWindow *ui;
QListWidget *item;
AskDialog *dialog;
};
#endif // BOBWINDOW_H
what should i do to fix it?
Everything's fine.
It breaks on the breakpoint because you have set breakpoints and running the program in debug mode (for sure).
Are there any breakpoints set by you? If so, remove them and run in debug mode.
Else, you can run the program in release mode.
To run the program in release mode use: Ctrl+R shortcut key
More on shortcuts here: http://doc.qt.nokia.com/qtcreator-2.4/creator-keyboard-shortcuts.html
Related
I try to switch between two different Widgets in QT5.
The first problem was that my first window was visible in the background of my second window. I solve this with a check in "autoFillBackground". Now i can switch between them, but if i resize them it only resize the Main content.
Both Widgets have a grid layout.
Resize Problem
Im new at QT5, so is there a better way to make a switching between 2 widgets without this problem?
I try it with wMessages = new Messages(); and hide() but then my program crash after going back.
Code:
mainwindow.h:
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
#include "messages.h"
QT_BEGIN_NAMESPACE
namespace Ui { class MainWindow; }
QT_END_NAMESPACE
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
MainWindow(QWidget *parent = nullptr);
~MainWindow();
private slots:
void on_btnMessages_clicked();
private:
Ui::MainWindow *ui;
Messages *wMessages;
};
#endif // MAINWINDOW_H
mainwindow.cpp:
#include "mainwindow.h"
#include "ui_mainwindow.h"
MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent)
, ui(new Ui::MainWindow)
{
ui->setupUi(this);
}
MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::on_btnMessages_clicked()
{
wMessages = new Messages(this);
wMessages->show();
}
messages.h:
#ifndef MESSAGES_H
#define MESSAGES_H
#include <QWidget>
namespace Ui {
class Messages;
}
class Messages : public QWidget
{
Q_OBJECT
public:
explicit Messages(QWidget *parent = nullptr);
~Messages();
QString NewsGenerator();
private slots:
void on_bBack_clicked();
void on_pushButton_clicked();
private:
Ui::Messages *ui;
};
#endif // MESSAGES_H
messages.cpp:
#include "messages.h"
#include "ui_messages.h"
Messages::Messages(QWidget *parent) :
QWidget(parent),
ui(new Ui::Messages)
{
ui->setupUi(this);
}
Messages::~Messages()
{
delete ui;
}
void Messages::on_bBack_clicked()
{
this->close();
QWidget *parent = this->parentWidget();
parent->show();
}
Edit 1 - working Main Window Button (from G.M.´s answer):
void MainWindow::on_btnMessages_clicked()
{
wPlaner = new Planer();
QMainWindow::setCentralWidget(wPlaner);
}
Update (based on the comments):
The best solution was to use the QStackedWidget to navigate between the views.
Docu: https://doc.qt.io/qt-5/qstackedwidget.html#details
Example-Code for Button:
// return back to first view
void MainWindow::on_btnret_clicked()
{
ui->stackedWidget->setCurrentIndex(0);
}
I'm using Qt 5 on a Windows and building a GUI App with multiple QDialog classes. I am trying to connect a signal from a QDialog in a triggered action of the QMainWindow class after instances of both have been created. I have read the documentation on Qt here: http://doc.qt.io/qt-4.8/signalsandslots.html and here: https://wiki.qt.io/New_Signal_Slot_Syntax. I have also read through many questions on stackoverflow that have helped correct some of the initial errors I was getting, but haven't helped me solve this problem.
The error I keep getting is:
"expected primary-expression before ',' token"
I have tried both the old syntax for connect
connect(sender, SIGNAL (valueChanged(QString,QString)),
receiver, SLOT (updateValue(QString)) );
and the new syntax (which is shown in the .cpp file below)
connect(sender, &Sender::valueChanged,
receiver, &Receiver::updateValue );
The MainWindow is created in the main.cpp and the 2nd dialog is created on_action_someAction_triggered(), so I know that the instances I am referencing exist. Is there a better way for me to connect the SIGNAL and the SLOT?
Here is the code I am working with (minus the extra unrelated code).
mainwindow .h:
#include <QMainWindow>
#include "shipdia.h"
namespace Ui {
class MainWindow;
}
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();
public slots:
void loadSelectedShip(QString shipName);
private slots:
void on_actionNew_Ship_triggered();
private:
Ui::MainWindow *ui;
shipdia *sDialog;
};
#endif // MAINWINDOW_H
mainwindow.cpp
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QTextStream>
#include <QObject>
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
}
MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::on_actionNew_Ship_triggered()
{
sDialog = new shipdia(this);
QObject::connect(&shipdia, //this is were I attempt to
&shipdia::sendShip, //connect the signal/slot
this,&MainWindow::loadSelectedShip); //but always get an error
sDialog ->show();
}
void MainWindow::loadSelectedShip(QString shipName)
{
... do something ... //this code works, but the signal is never received
}
qdialog.h
#ifndef SHIPDIA_H
#define SHIPDIA_H
#include "functions.h"
#include <QDialog>
namespace Ui {
class shipdia;
}
class shipdia : public QDialog
{
Q_OBJECT
public:
explicit shipdia(QWidget *parent = 0);
~shipdia();
private slots:
void on_pushButton_2_clicked();
signals:
void sendShip(QString shipName);
private:
Ui::shipdia *ui;
};
#endif // SHIPDIA_H
qdialog.cpp
#include "shipdia.h"
#include "ui_shipdia.h"
#include <QObject>
#include <QMessageBox>
#include <QTextStream>
#include <QDir>
shipdia::shipdia(QWidget *parent) :
QDialog(parent),
ui(new Ui::shipdia)
{
ui->setupUi(this);
}
shipdia::~shipdia()
{
delete ui;
}
void shipdia::sendSelectedShip(QString shipName)
{
emit sendShip(shipName); //I previously just emitted sendSelectedShip,
//but separating the function did not fix it.
}
void shipdia::on_pushButton_2_clicked()
{
//Code below functions up to next comment
QString shipName = ui->line_23->text();
shipName = QDir::currentPath() + "/shipFolder/" + shipName + ".txt";
QFile shipFile(shipName);
QStringList stringList;
if (shipFile.open(QIODevice::ReadOnly))
{
QTextStream in(&shipFile);
while(!in.atEnd())
{
QString line = in.readLine();
if(line.isNull())
break;
else
stringList.append(line);
}
shipFile.close();
}
//Code above functions ^
sendSelectedShip(shipName); //this line does not produce an error
}
I think, the code should be
sDialog = new shipdia(this);
QObject::connect(sDialog,
&shipdia::sendShip,this,&MainWindow::loadSelectedShip);
and it should be placed in the constructor of the MainWindow, right after ui->setupUi(this); and the on_actionNew_Ship_triggered() function should look like this:
void MainWindow::on_actionNew_Ship_triggered()
{
sDialog ->show();
}
In your original code, a new instance of shipdia will be created everytime the on_actionNew_Ship_triggered() is called. That should be avoided.
Hope this helps.
I've set up a basic Qt-Widgets-Application (Qt 5.5 community) with a simple QWidget "MainWindow" and an additinal QWidget "SettingsScreen".
Within the "MainWindow", touchscreen-events (handled by OS) are working as expected, but after opening the "SettingsScreen" all touch-events are executed on the desktop until I close the "SettingsScreen" using mouse or keyboard.
Environment:
Ubuntu Studio 14.04.03
Qt 5.5 Open Source Edition
mainwindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QWidget>
#include <settingsscreen.h>
namespace Ui {
class MainWindow;
}
class MainWindow : public QWidget
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();
private slots:
void on_btnExit_clicked();
void on_btnSettings_clicked();
private:
Ui::MainWindow *ui;
SettingsScreen *wSettingsScreen;
};
#endif // MAINWINDOW_H
mainwindow.cpp
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include "settingsscreen.h"
#include "ui_settingsscreen.h"
MainWindow::MainWindow(QWidget *parent) : QWidget(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
}
MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::on_btnExit_clicked()
{
this->close();
}
void MainWindow::on_btnSettings_clicked()
{
wSettingsScreen = new SettingsScreen(parentWidget());
wSettingsScreen->show();
}
settingsscreen.h
#ifndef SETTINGSSCREEN_H
#define SETTINGSSCREEN_H
#include <QWidget>
namespace Ui {
class SettingsScreen;
}
class SettingsScreen : public QWidget
{
Q_OBJECT
public:
explicit SettingsScreen(QWidget *parent = 0);
~SettingsScreen();
private slots:
void on_pushButton_clicked();
void on_btnBack_clicked();
private:
Ui::SettingsScreen *ui;
};
#endif // SETTINGSSCREEN_H
settingsscreen.cpp
#include "settingsscreen.h"
#include "ui_settingsscreen.h"
SettingsScreen::SettingsScreen(QWidget *parent) :
QWidget(parent),
ui(new Ui::SettingsScreen)
{
ui->setupUi(this);
}
SettingsScreen::~SettingsScreen()
{
delete ui;
}
void SettingsScreen::on_btnBack_clicked()
{
this->close();
}
I've just started developing with Qt, so please forgive me if I'm missing something essential :)
Any help would by highly appreciated!!
Thank you in advance!
Actually the thing is QMainwindow or any base Widget of your application is able to properly synthesize the Unhandled touch screen events to Mouse events. So whenever you are creating a dialog/widget, make sure to set Mainwindow as there parent and in the constructor of the child widget use setParent(parent). Even I was facing this kind of Issue and this worked for me.
I am trying to connect a signal from a second QMainWindow to the mainwindow. It doesn't say anything about a problem connection when the program is launched, but It doesn't work. I am not very familiar with C++ and Qt so maybe is something simple.
My code consists on a Mainwindow used as a SCADA with Start, stop, On, off buttons. In the second qmainwindow I created a terminal where you can type, start,stop... There, I would like to emit a signal to my MainWindow which is in charge of controlling the multiple threads and windows. The problem is that I cannot connect to my slot. I present here a simple overview of this two pieces of code.
Terminal. h
#ifndef TERMINAL__H
#define TERMINAL__H
#include <QMainWindow>
#include <QTextEdit>
#include <QLineEdit>
#include <QObject>
namespace Ui {
class Terminal_;
}
class Terminal_ : public QMainWindow
{
Q_OBJECT
public:
explicit Terminal_(QWidget *parent = 0);
~Terminal_();
signals:
void turnonPLC_terminal();
public slots:
void newline();
private:
Ui::Terminal_ *ui;
QTextEdit* mTerminal;
QLineEdit* mInput;
};
#endif // TERMINAL__H
mainwindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
#include "terminal_.h"
#include "terminal_help.h"
namespace Ui {
class MainWindow;
}
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();
Terminal_ *terminal;
public slots:
void turnon_terminal();
private:
Ui::MainWindow *ui;
};
#endif // MAINWINDOW_H
Mainwindow.cpp
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include "terminal_.h"
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
terminal = new Terminal_(this);
connect(terminal, SIGNAL(turnonPLC_terminal()), this, SLOT(turnon_terminal()));
}
MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::turnon_terminal(){
turnonPLC=1;
}
terminal_.cpp
#include "terminal_.h"
#include "ui_terminal_.h"
#include <QDockWidget>
#include <QWidget>
#include <QLineEdit>
QString on=("on");
Terminal_::Terminal_(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::Terminal_)
{
ui->setupUi(this);
mTerminal = new QTextEdit();
setCentralWidget(mTerminal);
mInput = new QLineEdit();
QDockWidget* qdw = new QDockWidget;
qdw->setWidget(mInput);
addDockWidget(Qt::BottomDockWidgetArea, qdw);
connect (mInput, SIGNAL(returnPressed()),
this, SLOT(newline()));
}
Terminal_::~Terminal_()
{
delete ui;
}
void Terminal_::newline(){
QString command = mInput->text();
if (command==on){
emit turnonPLC_terminal();
}
}
Thanks
The signal-slots part in the code works perfectly. (compiled and tested with some small modifications)
After entering "on" (not On as written in question)
Terminal_::newline() slot called, turnonPLC_terminal() is fired and finally
void MainWindow::turnon_terminal() is called.
However, there are some small details the header file is called terminal_.h, not Terminal.h turnonPLC is not defined. terminal is created by not displayed (no show-call).
I guess, there are simply some many small logic errors. Try to use debugger or trace the chain of expected calls with qDebug.
I let Qt-Creator to generate me a basic window app using Qt. I added there a button and try to connect it to a slot. It compiles fine but the app crashes and returns 3, please help me, I don't know what to do.
#include "form1.h"
#include "ui_form1.h"
#include <iostream>
Form1::Form1(QWidget *parent) : QMainWindow(parent), ui(new Ui::Form1)
{
connect(ui->buttonLoad,&QPushButton::clicked,this,&Form1::ButtonLoadClick);
ui->setupUi(this);
}
Form1::~Form1()
{
delete ui;
}
void Form1::ButtonLoadClick(){
using namespace std;
cout << "click!" << endl;
}
In the header I only added one public slot.
#ifndef FORM1_H
#define FORM1_H
#include <QMainWindow>
namespace Ui {
class Form1;
}
class Form1 : public QMainWindow
{
Q_OBJECT
public:
explicit Form1(QWidget *parent = 0);
~Form1();
public slots: //here
void ButtonLoadClick(); //here
private:
Ui::Form1 *ui;
};
#endif // FORM1_H
Try:
Form1::Form1(QWidget *parent) : QMainWindow(parent), ui(new Ui::Form1)
{
ui->setupUi(this);
connect(ui->buttonLoad,&QPushButton::clicked,this,&Form1::ButtonLoadClick);
}
setupUi creates all visual components, including push button.