I have a QTextEdit and I connected the textChanged() slot to a signal. How can I find the changes when the signal is emitted. For example, I want to save the cursor position and the character written when I write something.
In the slot that gets called when the signal is emitted you can get the text with QString str = textEdit->toplainText();. Also you can store the previous version of the string and compare to get the character that was added and its position.
Regarding the cursor position you can us QTextCurosr class as in this example:
widget.h file:
#ifndef WIDGET_H
#define WIDGET_H
#include <QWidget>
#include <QTextEdit>
#include <QTextCursor>
#include <QVBoxLayout>
#include <QLabel>
class Widget : public QWidget
{
Q_OBJECT
public:
Widget(QWidget *parent = 0);
~Widget();
private slots:
void onTextChanged();
void onCursorPositionChanged();
private:
QTextCursor m_cursor;
QVBoxLayout m_layout;
QTextEdit m_textEdit;
QLabel m_label;
};
#endif // WIDGET_H
widget.cpp file:
#include "widget.h"
#include <QString>
Widget::Widget(QWidget *parent)
: QWidget(parent)
{
connect(&m_textEdit, SIGNAL(textChanged()), this, SLOT(onTextChanged()));
connect(&m_textEdit, SIGNAL(cursorPositionChanged()), this, SLOT(onCursorPositionChanged()));
m_layout.addWidget(&m_textEdit);
m_layout.addWidget(&m_label);
setLayout(&m_layout);
}
Widget::~Widget()
{
}
void Widget::onTextChanged()
{
// Code that executes on text change here
}
void Widget::onCursorPositionChanged()
{
// Code that executes on cursor change here
m_cursor = m_textEdit.textCursor();
m_label.setText(QString("Position: %1").arg(m_cursor.positionInBlock()));
}
main.cpp file:
#include <QtGui/QApplication>
#include "widget.h"
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
Widget w;
w.show();
return a.exec();
}
Related
I would like to make some modifications of the main window from another file.
I created another ui file Form1Window (which open when a button is cliked in the MainWindow).
I want to call from the class Form1Window a function named test() of the MainWindow class
I succeed in calling function test() but I can't execute the whole content of the function (I can display a message but can't execute the part where I want to clear an edittext)
MainWindow.h
#include "form1window.h"
public slots:
void nettoyer();
private slots:
void openFrom1();
private:
Ui::MainWindow *ui;
From1Window *uiFrom1;
};
MainWindow.cpp
void MainWindow::openFrom1()
{
uiFrom1 = new From1Window(this);
uiFrom1->show();
}
void MainWindow::nettoyer(){
QMessageBox msgBox;
msgBox.setText("test");
msgBox.setIcon(QMessageBox::Information);
msgBox.setStandardButtons(QMessageBox::Ok);
msgBox.exec();
ui->auteur->clear();
//THIS LINE HAS NO EFFECT WHEN CALLED FROM THE OTHER CLASS
}
form1window.cpp
#include "mainwindow.h"
#include "ui_form1window.h"
void From1Window::on_supprimer_clicked()
{
MainWindow *a=new MainWindow ();
a->test();
close();
}
I've read about the role of the pointer of MainWindow class (C++ /Qt Proper way to access ui from another class in qt //Edited) and I've also tried connect()
Thank for your help
//THIS LINE HAS NO EFFECT WHEN CALLED FROM THE OTHER CLASS
this->ui->auteur->clear();
The line will never executed unless you dismiss QMessageBox. This is because you triggered QMessageBox with exec() function. This function has its own event queue and does not return until finishes. You may set QMessageBox as modal and display it with show() method. In that case QMessageBox will not block execution of the the flow.
This problem can also happen with QDialog(s) if you display them with exec().
I provide you a simple two window signal/slot example:
main.cpp
#include "mainwindow.h"
#include "form.h"
#include <QApplication>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
Form f;
f.show();
return a.exec();
}
form.h
#ifndef FORM_H
#define FORM_H
#include <QWidget>
#include <QPushButton>
class Form : public QWidget
{
Q_OBJECT
public:
explicit Form(QWidget *parent = 0);
~Form();
private:
QPushButton *pb;
};
#endif // FORM_H
form.cpp
#include "form.h"
#include "mainwindow.h"
#include <QDebug>
Form::Form(QWidget *parent) : QWidget(parent)
{
MainWindow *mw = new MainWindow();
pb = new QPushButton("clickME", this);
QObject::connect(pb, SIGNAL(clicked()), mw, SLOT(test()));
mw->show();
}
Form::~Form()
{
}
mainwindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
#include <QLabel>
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();
public slots:
void test();
private:
QLabel *l;
};
#endif // MAINWINDOW_H
mainwindow.cpp
#include "mainwindow.h"
#include <QDebug>
MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent)
{
l = new QLabel("test", this);
}
MainWindow::~MainWindow()
{
}
void MainWindow::test() {
qDebug() << "test called!" << endl;
l->setText("text changed");
}
This works for me.
output
I am trying to implement an image editor with some customized image edition tools not present in the Qt image classes. When the user clicks on the image scene to perform some operation, I want the image to be instantly updated in the GUI application, showing in real time to the user the changes (drawing pixels, zooming...). The problem is that the actions to edit the image when clicking can only be done (at least to my knowledge) inside a separate class (in the example I show below, such class is called GraphicsScene), and thus I don't know how to transfer the edited image to the MainWindow class.
In short, I would like to "send" the edited image from the GraphicsScene class to the MainWindow class immediately after the user performs an action to edit the image, and then make the latter one execute the code to update the screen in real time after each user action is performed on the image.
For the sake of clarity, I next show the scheme of the code I have for now.
main.cpp
#include "mainwindow.h"
#include <QApplication>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MainWindow w;
w.show();
return a.exec();
}
mainwindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
namespace Ui {
class MainWindow;
}
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();
Ui::MainWindow *ui;
private slots:
private:
};
#endif // MAINWINDOW_H
mainwindow.cpp
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QFileDialog>
#include <QApplication>
#include <QMouseEvent>
#include <QGraphicsSceneMouseEvent>
#include "graphicsscene.h"
extern QImage Image_original, Image_modified;
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
}
MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::on_actionOpen_Image_triggered()
{
QDir dir;
QString filename=QFileDialog::getOpenFileName(this,
tr("Open Background"),
path,
tr("Images (*.png *.bmp *.jpg *.jpeg);;All files (*.*)"));
Image_original.load(filename);
GraphicsScene * img = new GraphicsScene( this );
img->addPixmap(QPixmap::fromImage(Image_original));
ui->preview->setScene(img);
}
In order to be able to track the coordinates when clicking, and following some suggestions around the net, I created a subclass of QGraphicsScene called GraphicsScene, whose header file is:
graphicsscene.h
#ifndef GRAPHICSSCENE_H
#define GRAPHICSSCENE_H
#include <QGraphicsScene>
#include <QGraphicsSceneMouseEvent>
#include <QPointF>
#include <QList>
class GraphicsScene : public QGraphicsScene
{
Q_OBJECT
public:
explicit GraphicsScene(QObject *parent = 0);
virtual void mousePressEvent(QGraphicsSceneMouseEvent * mouseEvent);
signals:
public slots:
private:
int x, y;
};
#endif // GRAPHICSSCENE_H
Finally, to perform the image editions, the source file associated is:
graphicsscene.cpp
#include "graphicsscene.h"
#include <iostream>
using namespace std;
extern QImage Image_original, Image_modified;
GraphicsScene::GraphicsScene(QObject *parent) :
QGraphicsScene(parent)
{
this->setBackgroundBrush(Qt::gray);
}
void GraphicsScene::mousePressEvent(QGraphicsSceneMouseEvent * mouseEvent)
{
QGraphicsScene::mousePressEvent(mouseEvent);
if (mouseEvent->button()==Qt::LeftButton)
{
x=mouseEvent->scenePos().x();
y=mouseEvent->scenePos().y();
}
Image_modified=some_custom_image_editing_code(Image_original, x, y);
}
Ideally, I would like to execute the following action in MainWindow after the mousePressEvent is performed:
img->addPixmap(QPixmap::fromImage(Image_modified));
ui->preview->setScene(img);
I would highly appreciate any idea.
Since you want to click the item containing the pixmap it is not necessary to overwrite the QGraphicsScene mousePressEvent method, since you could click outside the image, it is better to overwrite that method in QGraphicsPixmapItem.
Instead of using extern to access the images, in Qt is better signals and slot, but only the classes that inherit from QObject can have these attributes, unfortunately QGraphicsPixmapItem does not inherit from this, but we can use it as interface.
graphicspixmapitem.h
#ifndef GRAPHICSPIXMAPITEM_H
#define GRAPHICSPIXMAPITEM_H
#include <QGraphicsPixmapItem>
#include <QObject>
class GraphicsPixmapItem : public QObject, public QGraphicsPixmapItem
{
Q_OBJECT
public:
explicit GraphicsPixmapItem(QObject *parent=0);
protected:
void mousePressEvent(QGraphicsSceneMouseEvent * event);
signals:
void newPixmap(const QPixmap p);
};
#endif // GRAPHICSPIXMAPITEM_H
graphicspixmapitem.cpp
#include "graphicspixmapitem.h"
#include <QGraphicsSceneMouseEvent>
GraphicsPixmapItem::GraphicsPixmapItem(QObject * parent):QObject(parent)
{
}
void GraphicsPixmapItem::mousePressEvent(QGraphicsSceneMouseEvent *event)
{
QPoint p = QPoint(event->pos().x(), event->pos().y());
QPixmap pix = pixmap();
if(!pix.isNull()){
QRect rect(QPoint(), pix.rect().size()/2);
rect.moveCenter(p);
QPixmap modified = pix.copy(rect);
modified = modified.scaled(pix.rect().size(), Qt::KeepAspectRatioByExpanding);
emit newPixmap(modified);
}
QGraphicsPixmapItem::mousePressEvent(event);
}
In the previous code we created the signal newPixmap, this connected it with a slot called onNewPixmap in MainWindow.
mainwindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
#include "graphicsscene.h"
#include "graphicspixmapitem.h"
namespace Ui {
class MainWindow;
}
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();
private slots:
void on_actionOpen_triggered();
void onNewPixmap(const QPixmap pixmap);
private:
Ui::MainWindow *ui;
GraphicsPixmapItem *item;
GraphicsScene *scene;
QPixmap original_pixmap;
QPixmap new_pixmap;
};
#endif // MAINWINDOW_H
mainwindow.cpp
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QGraphicsView>
#include <QFileDialog>
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
scene = new GraphicsScene(this);
ui->preview->setScene(scene);
item = new GraphicsPixmapItem;
/*ui->preview->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
ui->preview->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);*/
scene->addItem(item);
connect(item, &GraphicsPixmapItem::newPixmap, this, &MainWindow::onNewPixmap);
}
MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::on_actionOpen_triggered()
{
QString path = QDir::homePath();
QString filename=QFileDialog::getOpenFileName(this,
tr("Open Background"),
path,
tr("Images (*.png *.bmp *.jpg *.jpeg);;All files (*.*)"));
original_pixmap = QPixmap(filename);
item->setPixmap(original_pixmap);
}
void MainWindow::onNewPixmap(const QPixmap pixmap)
{
new_pixmap = pixmap;
QFile file("new_file.png");
file.open(QIODevice::WriteOnly);
new_pixmap.save(&file, "PNG");
}
In that slot as test I save the image in the folder where the executable is generated.
In your code I see that you use QImage, if you want to continue using it you can convert QPixmap to QImage with:
new_pixmap.toImage()
The complete example is found here
I have 3 classes.
class with a mainwindow which comes from the designer(ui-file)
class wich will manage database stuff like inserts
controller class. I want to extend the whole thing to networkcommunication later.
My problem:
I want to connect a simple QPushButton ui->addbutton from the window class with a slot addEntry from the databaseclass, but I get this error :
ERROR: no matching function for call to
'generalControler::connect(QPushButton*, const char*, dbmanager*&,
const char*)'
mydb, SLOT(addEntry()));
//no difference with &mydb or *mydb
MainWindow(0x13f57988, name = "MainWindow") QPushButton(0x13f5f3e0, name = "addButton")
MainWindow(0x13f57988, name = "MainWindow") 0x13f5f3e0//<--?????
//<=Here u see the adresses printed with Qdebug(). top: mainwindowclass. bot: generalcontrolerclass
//why there is missing information after returning the adress of a 'ui->addButton' to another class? Is this maybe the problem?
main.cpp
#include <QApplication>
#include "generalcontroler.h"
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
generalControler controler;
return a.exec();
}
generalcontroler.h
#ifndef GENERALCONTROLER_H
#define GENERALCONTROLER_H
#include <QApplication>
#include "mainwindow.h"
#include "dbmanager.h"
class generalControler : public QObject
{
Q_OBJECT
public:
generalControler();
};
#endif // GENERALCONTROLER_H
generalcontroler.cpp
#include "generalcontroler.h"
#include <QDebug>
generalControler::generalControler(){
MainWindow* window = new MainWindow;
window->show();
dbmanager* mydb= new dbmanager("path_to_my_database.db", window);
mydb->addEntry();
qDebug()<<window->getThis()<<window->getcloseButton();
connect(window->getaddButton(), SIGNAL(clicked()),
mydb, SLOT(addEntry()));
mainwindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
#include <QMessageBox>
namespace Ui {
class MainWindow;
}
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();
QPushButton* getaddButton();
private:
Ui::MainWindow *ui;
};
#endif // MAINWINDOW_H
mainwindow.cpp
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QDebug>
MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWindow){
ui->setupUi(this);
}
QPushButton* MainWindow::getaddButton()
{
return ui->addButton;
}
dbmanager.h
#ifndef DBMANAGER_H
#define DBMANAGER_H
#include <QSqlDatabase>
#include <QDebug>
#include "mainwindow.h"
class dbmanager: public QObject{
Q_OBJECT
public:
dbmanager(const QString& path);
public slots:
void addEntry();
private:
QSqlDatabase mydatabase;
};
#endif // DBMANAGER_H
dbmanager.cpp
#include "dbmanager.h"
dbmanager::dbmanager(const QString& path)
{
mydatabase = QSqlDatabase::addDatabase("QSQLITE");
mydatabase.setDatabaseName(path);
if (!mydatabase.open())
{
qDebug() << "Error: connection fail";
}
else
{
qDebug() << "Database: connection ok";
}
}
void dbmanager::addEntry()
{
qDebug()<<"addEntry success";
}
I was searching for 6 hours but I never saw such an example with 2 classes, a controler and an ui-file. Could anyone help me?
The connect looks good to me. Try if #include <QPushButton> in generalcontroler.cpp helps. If the compiler knows about QPushButton only by forward-declaration, it doesn't know that it's a QObject and thus the connect() signatures (with QObject* in it) don't match.
I have a problem with my Qt code. I wanted to write an program which are taking a coordinates of point and then that point is drawing in point with that coordinates. My program doesn't have any errors or warnings when i built it but it's crashing at start(MainWindow doesn't show). This is my code:
main.cpp
#include < QApplication >
#include "mainwindow.h"
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
MainWindow win;
win.show();
return app.exec();
}
mainwindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
#include <QWidget>
#include <QAction>
#include <QToolBar>
#include <QTextCodec>
#include <QObject>
#include <QDialog>
#include <QLineEdit>
#include <QPushButton>
#include <QString>
#include "addpoint.h"
class MainWindow: public QMainWindow
{
Q_OBJECT
private:
QToolBar *AddToolbar;
QAction *AddPointAction;
AddPoint *AddPointDialog;
QLineEdit *x;
public:
MainWindow();
void createToolbar();
void createActionAdd();
signals:
public slots:
void PointClicked();
void DialogAccepted();
};
#endif // MAINWINDOW_H
mainwindow.cpp
#include "mainwindow.h"
MainWindow::MainWindow()
{
QTextCodec::setCodecForLocale(QTextCodec::codecForName("UTF-8"));
createActionAdd();
createToolbar();
connect(AddPointAction, SIGNAL(triggered(bool)), this, SLOT(PointClicked()));
connect(AddPointDialog, SIGNAL(accepted()), this, SLOT(DialogAccepted()));
setMinimumSize(480, 320);
}
/**/
void MainWindow::createToolbar()
{
AddToolbar = new QToolBar;
AddToolbar->addAction(AddPointAction);
addToolBar(AddToolbar);
}
/**/
void MainWindow::createActionAdd()
{
AddPointAction = new QAction("Add Road", this);
x = new QLineEdit(this);
x->setFixedSize(100, 30);
x->move(100, 100);
}
/**/
void MainWindow::PointClicked()
{
AddPointDialog = new AddPoint(this);
AddPointDialog->setModal(true);
AddPointDialog->exec();
}
/**/
void MainWindow::DialogAccepted()
{
x->setText("abc");
}
addpoint.h
#ifndef ADDPOINT_H
#define ADDPOINT_H
#include <QWidget>
#include <QTextCodec>
#include <QDialog>
#include <QObject>
#include <QLabel>
#include <QLineEdit>
#include <QPushButton>
#include <QString>
class AddPoint : public QDialog
{
Q_OBJECT
private:
QLabel *XpointL;
QLineEdit *XPoint;
QPushButton *OKButton;
public:
AddPoint(QWidget *parent);
void createButton();
signals:
public slots:
};
#endif // ADDPOINT_H
addpoint.cpp
#include "addpoint.h"
AddPoint::AddPoint(QWidget *parent) :QDialog(parent)
{
QTextCodec::setCodecForLocale(QTextCodec::codecForName("UTF-8"));
createButton();
connect(OKButton, SIGNAL(clicked(bool)), this, SLOT(accept()));
setMinimumSize(320, 240);
}
/**/
void AddPoint::createButton()
{
XpointL = new QLabel("Point X:", this);
XpointL->setFixedSize(100, 30);
XpointL->move(10, 10);
XPoint = new QLineEdit(this);
XPoint->setFixedSize(180, 30);
XPoint->move(120, 10);
OKButton = new QPushButton("OK", this);
OKButton->setFixedSize(100, 30);
OKButton->move(200, 150);
}
After running the program i see in aplication output lap:
"The program has unexpectedly finished."
"C:\QT\build-xxx-Desktop_Qt_5_4_2_MSVC2013_64bit-Debug\debug\xx.exe crashed"
I note that i made some experiments with this code and i saw that i have problem with signal accpeted() at mainwindow.cpp. I don't know what can i do with this problem. I hope you will help me.
AddPointDialog is uninitialized pointer, it does not yet point to valid AddPoint in MainWindow's constructor. You cannot call connect on that. Its value will change later, when you do AddPointDialog = new AddPoint(this); and only then will you be able to call connect.
Simply, you should move your connect call to void MainWindow::PointClicked() after you've initialized your pointer. I'd also make AddPointDialog local to that function and store it on the stack (you don't use it anywhere else and you're leaking memory).
The code would be:
void MainWindow::PointClicked()
{
AddPoint AddPointDialog(this);
AddPointDialog.setModal(true);
connect(&AddPointDialog, SIGNAL(accepted()), this, SLOT(DialogAccepted()));
AddPointDialog.exec();
}
Ok I think is time to get some help, I have been practicing with signals and slots in Qt and I got stocked. What I want is to be able to change a label in mainwindow when a button in a QDialog is clicked. I have been searching and apparently the only way to do this is basically using signals and slots, here is what I have...
I have a mainwindow.ui with a button called "pushButton_OpenWindow" and a QLabel label_ShowText", I also have a externaldialog.ui that contains a QLineEdit called lineEdit_ExternalInput" and a QPushButton called "pushButton_SendText", and what I want is to change "label_ShowText" to whatever value "lineEdit_ExternalInput" is when pushButton_SendText" is clicked but it doesn't work, when I click the button nothing happens no errors, no warnings nothing.
Here is the code that doesn't work...
mainwindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
namespace Ui {
class MainWindow;
}
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();
private slots:
void on_pushButton_OpenWindow_clicked();
void textValue(const QString &newText);
private:
Ui::MainWindow *ui;
};
#endif // MAINWINDOW_H
mainwindow.cpp
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include "externaldialog.h"
#include <QDebug>
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
ExternalDialog *externalDialog = new ExternalDialog;
// connecting signals and slots
QObject::connect(externalDialog, SIGNAL(textChanged(QString)), this, SLOT(textValue(QString)));
}
MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::on_pushButton_OpenWindow_clicked()
{
ExternalDialog mDialog;
mDialog.setModal(true);
mDialog.exec();
}
void MainWindow::textValue(const QString &newText)
{
ui->label_ShowText->setText(newText);
qDebug()<<"Message from textValue Function \n";
}
externaldialog.h
#ifndef EXTERNALDIALOG_H
#define EXTERNALDIALOG_H
#include <QDialog>
namespace Ui {
class ExternalDialog;
}
class ExternalDialog : public QDialog
{
Q_OBJECT
public:
explicit ExternalDialog(QWidget *parent = 0);
~ExternalDialog();
private:
Ui::ExternalDialog *ui;
signals:
void textChanged(const QString&);
public slots:
void on_pushButton_SendText_clicked();
};
#endif // EXTERNALDIALOG_H
externaldialog.cpp
#include "externaldialog.h"
#include "ui_externaldialog.h"
#include <QDebug>
ExternalDialog::ExternalDialog(QWidget *parent) :
QDialog(parent),
ui(new Ui::ExternalDialog)
{
ui->setupUi(this);
}
ExternalDialog::~ExternalDialog()
{
delete ui;
}
void ExternalDialog::on_pushButton_SendText_clicked()
{
emit textChanged(ui->lineEdit_ExternalInput->text());
qDebug()<<"Sent Message";
}
main.cpp
#include "mainwindow.h"
#include <QApplication>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MainWindow w;
w.show();
return a.exec();
}
Any idea what I'm I doing wrong? Any suggestion will be appreciated. Sorry I posted the whole code but sometimes is better to see the whole picture.
Thanks a lot
change function MainWindow::on_pushButton_OpenWindow_clicked() into this
void MainWindow::on_pushButton_OpenWindow_clicked()
{
externalDialog->setModal(true);
externalDialog->exec();
}
You have just create a new unconnected dialog in the original function.