using wizard

[arjita]

i am creating a wizard in which in first page, i ll be asking a number( say num in a textbox) from user and in next page i ll be creating as many textboxes as entered by user in previous page (that is in num)..
initializePage() function of nextpage is:
void NextPage::initializePage() //let NextPage be a class
{
no_of_textboxes=field("num").toInt(); //is not working however
noOfTextboxes=field("num").toString();//is working
}
where no_of_textboxes(int type) and noOfTextboxes(QString type) are declared in class NextPage
nd num is registered field of class PreviousPage.
I tried
no_of_textboxes=noOfTextboxes.toInt(); even this didn't work...
Plz help ...

[ChrisW67]

"It doesn't work" is rarely an adequate description of a problem. What does it do? What were you expecting? What is the QVariant type and value of field("num")? What type of input widget is used to gather "num" on the first page?

[amleto]

Post complete, and compilabe example (see sig).

Also use code tags.

What is the (string) value of noOfTextboxes?

[arjita]

ok if my post is ambigoius i am posting the original code ....

class Dynamic : public QWizard
{
    Q_OBJECT
    public:
    explicit Dynamic(QWidget *parent = 0);
    ~Dynamic();
      void accept();
};
class GraphInfoPage: public QWizardPage
{
    Q_OBJECT
public:
    GraphInfoPage(QWidget *parent = 0);
 
private:
    QLabel *VerticesLabel;
QLabel *EdgesLabel;
QLineEdit *VerticesLineEdit;
QLineEdit *EdgesLineEdit;
};
class VerticesInfoPage: public QWizardPage
{
    Q_OBJECT
public:
    VerticesInfoPage(QWidget *parent = 0);
private:
    QLineEdit *LineEdit[];
    QLineEdit *LineEit;
     int v;
    QGridLayout *layout;
protected:
    void initializePage();
 
};
//dynamic.cpp
Dynamic:: Dynamic(QWidget *parent) :
    QWizard (parent)
{
    addPage(new GraphInfoPage);
    addPage(new VerticesInfoPage);
    setWindowTitle(tr("Graph Wizard"));
}
GraphInfoPage::GraphInfoPage(QWidget *parent): QWizardPage(parent)
{
    setTitle(tr("<i>Enter Graph Details</i>"));
    VerticesLabel = new QLabel(tr("<b>Vertices:</b> "));
    QGridLayout *layout = new QGridLayout;
    VerticesLineEdit = new QLineEdit;
    VerticesLabel->setBuddy(VerticesLineEdit);
    VerticesLineEdit->setMaxLength(2);
    VerticesLineEdit->setMaximumWidth(35);
 
    setLayout(layout);
    registerField("vertices*", VerticesLineEdit);
    layout->addWidget(VerticesLabel, 0,0);
    layout->addWidget(VerticesLineEdit,0,1);
  }
VerticesInfoPage::VerticesInfoPage(QWidget *parent):QWizardPage(parent)
{
    setTitle(tr("<i>Enter vertices: </i>"));
    layout = new QGridLayout;
    setLayout(layout);
    int k=0,j=0;
    LineEit=new QLineEdit;
    LineEit->setMaximumWidth(35);
   LineEit->setMaxLength(3);
    LineEit->setReadOnly(true);
 
    layout->addWidget(LineEit,0,0);
    /* for(int i=1;i<v;i++)
        {
           LineEdit[i]=new QLineEdit;
           LineEdit[i]->setMaximumWidth(35);
           LineEdit[i]->setMaxLength(3);
           layout->addWidget(LineEdit[i],++j,k);
           if(j==4){j=0;k++;}
        }*/
 
}
void VerticesInfoPage::initializePage()
{
   QString h=field("vertices").toString();
    LineEit->setText(h);
}
//main.cpp
 
 
 
#include <QtGui/QApplication>
#include "dynamic.h"
 
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    Dynamic w;
    w.show();
 
    return a.exec();
}

class Dynamic : public QWizard
{
    Q_OBJECT
    public:
    explicit Dynamic(QWidget *parent = 0);
    ~Dynamic();
      void accept();
};
class GraphInfoPage: public QWizardPage
{
    Q_OBJECT
public:
    GraphInfoPage(QWidget *parent = 0);

private:
    QLabel *VerticesLabel;
QLabel *EdgesLabel;
QLineEdit *VerticesLineEdit;
QLineEdit *EdgesLineEdit;
};
class VerticesInfoPage: public QWizardPage
{
    Q_OBJECT
public:
    VerticesInfoPage(QWidget *parent = 0);
private:
    QLineEdit *LineEdit[];
    QLineEdit *LineEit;
     int v;
    QGridLayout *layout;
protected:
    void initializePage();

};
//dynamic.cpp
Dynamic:: Dynamic(QWidget *parent) :
    QWizard (parent)
{
    addPage(new GraphInfoPage);
    addPage(new VerticesInfoPage);
    setWindowTitle(tr("Graph Wizard"));
}
GraphInfoPage::GraphInfoPage(QWidget *parent): QWizardPage(parent)
{
    setTitle(tr("<i>Enter Graph Details</i>"));
    VerticesLabel = new QLabel(tr("<b>Vertices:</b> "));
    QGridLayout *layout = new QGridLayout;
    VerticesLineEdit = new QLineEdit;
    VerticesLabel->setBuddy(VerticesLineEdit);
    VerticesLineEdit->setMaxLength(2);
    VerticesLineEdit->setMaximumWidth(35);

    setLayout(layout);
    registerField("vertices*", VerticesLineEdit);
    layout->addWidget(VerticesLabel, 0,0);
    layout->addWidget(VerticesLineEdit,0,1);
  }
VerticesInfoPage::VerticesInfoPage(QWidget *parent):QWizardPage(parent)
{
    setTitle(tr("<i>Enter vertices: </i>"));
    layout = new QGridLayout;
    setLayout(layout);
    int k=0,j=0;
    LineEit=new QLineEdit;
    LineEit->setMaximumWidth(35);
   LineEit->setMaxLength(3);
    LineEit->setReadOnly(true);

    layout->addWidget(LineEit,0,0);
    /* for(int i=1;i<v;i++)
        {
           LineEdit[i]=new QLineEdit;
           LineEdit[i]->setMaximumWidth(35);
           LineEdit[i]->setMaxLength(3);
           layout->addWidget(LineEdit[i],++j,k);
           if(j==4){j=0;k++;}
        }*/

}
void VerticesInfoPage::initializePage()
{
   QString h=field("vertices").toString();
    LineEit->setText(h);
}
//main.cpp



#include <QtGui/QApplication>
#include "dynamic.h"

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    Dynamic w;
    w.show();
    
    return a.exec();
}

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if now I want to convert sting h to integer v...
using
bool *ok;
v=h.toInt(ok,10);
this is not working in the sense nothing is getting stored in v... to check i used following code
char ch[2];
ch[0]=v;
ch[1]='\0';
and displayed in textbox LineEit but nothing is displayed... I want 'v' to hold the integer value entered by user in first page so that I can create as many text boxes as user want in next page that is VerticesInfoPage.
Hope I explained my problem ...plz help...

[ChrisW67]

Oh dear, where to begin.

bool *ok;
v=h.toInt(ok,10);

bool *ok;
v=h.toInt(ok,10);

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The first line declares a pointer to a bool but does not allocate space for a bool or initialise the pointer so that the second line is using an uninitialised pointer. If the second line survives the real possibility of crashing then v will contain something: an integer has no "nothing" value. I suggest you take a good look at the example usage of QString::toInt()

Your method of 'checking' is just plain broken. What do you expect to see if v == 0? What about v == 1? What is character 0 or 1?


BTW: If you want the user to enter a number it would be wise to only allow the user to enter a number using either a QSpinBox or by putting a QIntValidator on the QLineEdit.

[arjita]

k.. i changed the above code and used spinbox instead..now can u plz tel me how to take the value of spinBox as integer in next page...?

[amleto]

first, have you seen thishttp://doc.qt.io/qt-4.8/QSpinBox?

[arjita]

yes i have already seen this class but there is only signal valueChanged ( int i ) where integer stores value of the spinbox but to which QObject should I connect this signal, i am not getting this...plz help

[amleto]

connect it to whatever object would like to know that information

[arjita]

but i want to store that in an integer .. is it possible??

[amleto]

it gives you the value in an integer. so what is the problem?