Struct

GLibOptionEntry

Description

struct GOptionEntry {
  const gchar* long_name;
  gchar short_name;
  gint flags;
  GOptionArg arg;
  gpointer arg_data;
  const gchar* description;
  const gchar* arg_description;
}

A GOptionEntry struct 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().

Structure members

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.
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.
flags: Flags from GOptionFlags.
arg: The type of the option, as a GOptionArg.
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().
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().
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().