How to show alerts using GtkMessageDialog

1. create the layout with

GtkBox

, adding a

GtkLabel

,

GtkEntry

and a

GtkButton

;
2. connect the

GtkButton

click signal, to take action when click on button;
3. when click, get the

GtkEntry

text with

GtkEntry::get_text

;
4. to display a alert, create a

GtkMessageDialog

, configuring for what

GtkWidow

, the display mode, the

GtkMessageType

, the

GtkButtonsType

and the message;
5. run the dialog with

GtkMessageDialog::run

and wait this to be closed;
6. when the alert closed, call the

GtkMessageDialog::destroy

to free memory;