GOptionEntry

A GOptionEntry defines a single option. To have an effect, they must be added to a GOptionGroup with g_option_context_add_main_entries() or g_option_group_add_entries(). const gchar *long_name; The long name of an option can be used to specify it in a commandline as --long_name. Every option must have a long name. To resolve conflicts if multiple option groups contain the same long name, it is also possible to specify the option as --groupname-long_name. gchar short_name; If an option has a short name, it can be specified -short_name in a commandline. short_name must be a printable ASCII character different from '-', or zero if the option has no short name. gint flags; Flags from GOptionFlags. GOptionArg arg; The type of the option, as a GOptionArg. gpointer arg_data; If the arg type is G_OPTION_ARG_CALLBACK, then arg_data must point to a GOptionArgFunc callback function, which will be called to handle the extra argument. Otherwise, arg_data is a pointer to a location to store the value, the required type of the location depends on the arg type: G_OPTION_ARG_NONE gboolean G_OPTION_ARG_STRING gchar* G_OPTION_ARG_INT gint G_OPTION_ARG_FILENAME gchar* G_OPTION_ARG_STRING_ARRAY gchar** G_OPTION_ARG_FILENAME_ARRAY gchar** G_OPTION_ARG_DOUBLE gdouble If arg type is G_OPTION_ARG_STRING or G_OPTION_ARG_FILENAME the location will contain a newly allocated string if the option was given. That string needs to be freed by the callee using g_free(). Likewise if arg type is G_OPTION_ARG_STRING_ARRAY or G_OPTION_ARG_FILENAME_ARRAY, the data should be freed using g_strfreev(). const gchar *description; the description for the option in --help output. The description is translated using the translate_func of the group, see g_option_group_set_translation_domain(). const gchar *arg_description; The placeholder to use for the extra argument parsed by the option in --help output. The arg_description is translated using the translate_func of the group, see g_option_group_set_translation_domain().