inserting a row in a QTableWidget doesn t work!

Hi everybody,
i want to insert a row in QTableWidget with a buttonclick.

Code:

---

class CoordinateTable:public QTableWidget
{
       Q_OBJECT
public:
        CoordinateTable(QWidget *parent=0);
 
private slots :
  void addrow();
 
};
 
 
CoordinateTable::CoordinateTable(QWidget *parent)
    : QTableWidget(parent)
{   setColumnCount(2);
    setRowCount(2);
    };
  void  CoordinateTable::addrow()
   {
     int row = CoordinateTable::rowCount();
    CoordinateTable:: insertRow(row);
 
        };

---

In main

Code:

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....
CoordinateTable  *tableWidget = new  CoordinateTable;
 QObject::connect(okbutton, SIGNAL(clicked()),
                            tableWidget ,SLOT(addrow()));

---

okbutton is a QT4 QPushButton.
Nothing happens when i click the button and i dont understand why.:confused:

What happens if you add "qApp->aboutQt();" to CoordinateTable::addrow()?

Hi jacek,Thanks for your reply.
If you mean like that:

Code:

---

void CoordinateTable::addrow()
   { 
     int row = CoordinateTable::rowCount();
    CoordinateTable::insertRow(row);
    qApp->aboutQt();
        };

---

it doesnt work too!

Quote:

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Originally Posted by adonis

it doesnt work too!

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Does "doesn't work" mean that the application runs, but it doesn't show the "About Qt" window when you click the button?

Quote:

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Originally Posted by jacek

Does "doesn't work" mean that the application runs, but it doesn't show the "About Qt" window when you click the button?

---

Yes, that´s what i mean!

Add "CONFIG += console" to your .pro file, re-run qmake and make and see whether there are no error messages on the console.

How do you initialize okbutton?

Is the class declaration in a header file and listed in .pro?

I don t see any errors on the console;
The initialization of the okbutton is:

Code:

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QPushButton *okbutton=new QPushButton("Ok");

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Do you add your button to a layout? Because I don't see creating it with a parent, and if you don't add it to a layout, I'm not sure any signals will work?

Does connect says anything in the debug console?

Regards

it works now!:) i ve included a .moc file(i don t really understand how this works) and now every thing is OK.

Thank you guys!

Quote:

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Originally Posted by adonis

i ve included a .moc file(i don t really understand how this works) and now every thing is OK.

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That .moc file, among other things, contains the code that implements the signals and slots mechanism for your class. If you won't link your application with it, signals and slots won't work for your class. To avoid such problems in future, you should use qmake, CMake or any other build system, that understands Qt needs.

Thanks jacek for the explanation.Actually ,i am using qmake.Should I use the moc file each time i want to define Signals or Slots in a class??

Quote:

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Originally Posted by adonis

Actually ,i am using qmake.Should I use the moc file each time i want to define Signals or Slots in a class??

---

If you use qmake, then there are two things to remember:

• you have to re-run qmake after you add or remove Q_OBJECT macro to a class definition,
• if a class definition with Q_OBJECT is placed in a .cpp file instead of a header file, you have to add #include "filename.moc" at the end of that file and re-run qmake.