how to add new class ?

[Lost User]

Good catch, but even after removing the () I get same error.

  //! \[1\]
        //! add rfcomm ??
        m\_serial(new QSerialPort(this),
       // sequence 1\` st add HERE
        m\_TAB\_Ext(new A\_BT\_TAB\_DIALOG\_EXT)

[Mircea Neacsu]

I think you are missing the declaration for m_tab_ext. Your class should look like:

class A_BT_TAB_DIALOG_EXT : public QWidget
{
Q_OBJECT

public:
explicit A_BT_TAB_DIALOG_EXT(QWidget *parent = nullptr);
~A_BT_TAB_DIALOG_EXT();

private:
Ui::A_BT_TAB_DIALOG_EXT *ui;

// 3 define / declare members / parameters

QLabel \*m\_status = nullptr;
QMdiArea \*m\_mdiarea = nullptr;
QSerialPort \*m\_serial = nullptr;

A\_BT\_TAB\_DIALOG\_EXT \*m\_TAB\_Ext;
//...blah, blah, more stuff here

}

Mircea

[Mircea Neacsu]

Not sure I understand what you try to do. Maybe the code samle is a bit too short. Where is the `m_TAB_ext` initialization line? I don;t see a declaration for `m_TAB_ext`.

Mircea

[CPallini]

Quote:

m_serial(new QSerialPort(this), // sequence 1` st add HERE m_TAB_Ext(new A_BT_TAB_DIALOG_EXT)

Which of the overloaded constructors of the QSerialPort class are you trying to call? Could you please show full details of m_TAB_Ext variable?

"In testa che avete, Signor di Ceprano?" -- Rigoletto

[Lost User]

What is the definition of m_TAB_Ext? It looks like it, or m_serial, is looking for a function reference/pointer, but you are passing it a pointer to a A_BT_TAB_DIALOG_EXT object.

[BernardIE5317]

May I please inquire what is a Q_OBJECT .

[Lost User]

Here are all parameters definitions (?) PS There are no other errors / issues . So what is

QSerialPort *m_serial = nullptr;

contributing to the issue / error and why is it part of the discussion? ( just asking )

private:
// sequence 4th*
public:
A_BT_TAB_DIALOG_EXT *m_TAB_Ext = nullptr;

private:

    void showStatusMessage(const QString &message);
    Ui::MainWindow\_Bluetooth \*m\_ui = nullptr;
    // add MDIarea ??
    QMdiArea  \*m\_mdiarea = nullptr;

    QLabel \*m\_status = nullptr;
    Console \*m\_console = nullptr;
    SettingsDialog \*m\_settings = nullptr;
    QSerialPort \*m\_serial = nullptr;


    // STEP 2 define class ??
    // spelling error  !!!
    SettingsDialog\_RFcomm \*m\_settings\_RFcomm = nullptr;

[Lost User]

SOLVED THANKS, you have a very nice , positive , constructive way to lead to solution.

[BernardIE5317]

I inquire re/ Q_OBJECT because I do not understand why the compiler does not report an error re/ its usage in the code as written as I assume it is either the name of a type perhaps a class type or an identifier of an object of some type. In either case it would of course be a syntax error exempli gratia as per below:

class cfoo
{
int // syntax error
public:
void foo();
}

Likewise it is a syntax error to write the identifier of an object without a type specifier exempli gratia as per below:

class cfoo
{
xyz // syntax error
public:
void foo();
}

Perhaps Q_OBJECT is a macro hiding these details. In conclusion I do not see the answer to my inquiry.

[Lost User]

Sorry , I got sidetracked fixing the issue. I have been told , not just advised, NOT to post Qt questions. Since I am not welcomed to do so I , on my own, do not want to discuss Qt here. I think that is fair. Cheers