Re: [gtkmm] I am stuck with a C++ problem

["Andreas B. Thun" <abt gmx de>]

I solved it! I must allocate objects dynamically:

    for (int i=0; i<10; i++)
    {
	ParameterLine *pLine;
	Pline = new(ParameterLine);
	pack_start(pLine);
    }

Andreas B. Thun wrote:
> Hi members,
>
> I have a C++ problem I just cannot solve.
> I am new to C++ so maybe you can help easily:
>
> I want to create 10 ParameterLines holding
> 4 widgets within class ParameterLine.
> ParameterLine is derived from HBox.
>
> class Parameters is calling ParameterLine
> to create those boxes. Parameters is
> derived from VBox, holding all objects
> of ParameterLine.
>
> My problem is I cannot see any widget
> in my table! Something is wrong with
> creation of my objects.
> When I create the widgets directly in
> main.cpp without classes involved it works....
>
>
> main.h
> Parameters m_Parameters;
>
> main.cpp:
> myTable->attach(m_Parameters, 0, 6, 1, 2);
>
>
> Parameters.h:
> -------------
> class Parameters : public Gtk::VBox {
>   public:
>     Parameters();
>     virtual ~Parameters();
> };
>
>
> Parameters.cpp:
> ---------------
> // An object of this class represents all ParameterLines in a VBox
> Parameters::Parameters()
> {
>    // Generate ParameterLines
>    for (int i=0; i<10; i++)
>    {
>        ParameterLine pLine;
>       pack_start(pLine);
>    }
> }
>
>
> ParameterLine.h:
> ----------------
> class ParameterLine : public Gtk::HBox {
>   public:
>     ParameterLine();
>     virtual ~ParameterLine();
>
>   protected:
>     Gtk::Label  m_paramNameLabel;
>     Gtk::Entry  m_paramValEntry;
>     Gtk::Label  m_paramTypeLabel;
>     Gtk::Button m_descButton;
> };
>
>
> ParameterLine.cpp:
> ------------------
> ParameterLine::ParameterLine() : m_descButton("Help")
> {
>   // View Name of Parameter as Label
>   m_paramNameLabel.set_alignment(Gtk::ALIGN_LEFT);
>   m_paramNameLabel.set_text("m_name");
>
>   // View Value of Parameter in an entry
>   m_paramValEntry.set_text(m_value);
>   m_paramValEntry.set_editable("true");
>
>   // View Type of Parameter as Label
>   m_paramTypeLabel.set_text("m_type");
>
>   // Pack all widgets into this object
>   pack_start(m_paramNameLabel);
>   pack_start(m_paramValEntry);
>   pack_start(m_paramTypeLabel);
>   pack_start(m_descButton);
> }
>
>
>
> TIA,
> Andi
>
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