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<a name="sec-combobox-get"></a>The chosen item</h2></div></div></div>
<p>To discover what item, if any, the user has chosen from the ComboBox, call <code class="methodname">ComboBox::get_active()</code>. This returns a <code class="classname">TreeModel::iterator</code> that you can dereference to a <code class="classname">Row</code> in order to read the values in your columns. For instance, you might read an integer ID value from the model, even though you have chosen only to show the human-readable description in the ComboBox. For instance:
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<pre class="programlisting"><code class="code">Gtk::TreeModel::iterator iter = m_Combo.get_active();
if(iter)
{
auto row = *iter;
//Get the data for the selected row, using our knowledge
//of the tree model:
auto id = row[m_Columns.m_col_id];
set_something_id_chosen(id); //Your own function.
}
else
set_nothing_chosen(); //Your own function.</code></pre>
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