glibmm: Gio::NetworkMonitor Class Reference

Network status monitor. More...

#include <giomm/networkmonitor.h>

Inheritance diagram for Gio::NetworkMonitor:

[legend]

Public Member Functions
	NetworkMonitor (NetworkMonitor &&src) noexcept

NetworkMonitor &	operator= (NetworkMonitor &&src) noexcept

	~NetworkMonitor () noexcept override

GNetworkMonitor *	gobj ()
	Provides access to the underlying C GObject.

const GNetworkMonitor *	gobj () const
	Provides access to the underlying C GObject.

bool	get_network_available () const
	Checks if the network is available.

bool	get_network_metered () const
	Checks if the network is metered.

NetworkConnectivity	get_connectivity () const
	Gets a more detailed networking state than g_network_monitor_get_network_available().

bool	can_reach (const Glib::RefPtr< SocketConnectable > &connectable, const Glib::RefPtr< Cancellable > &cancellable)
	Attempts to determine whether or not the host pointed to by connectable can be reached, without actually trying to connect to it.

bool	can_reach (const Glib::RefPtr< SocketConnectable > &connectable)
	A can_reach() convenience overload.

void	can_reach_async (const Glib::RefPtr< SocketConnectable > &connectable, const SlotAsyncReady &slot, const Glib::RefPtr< Cancellable > &cancellable)

bool	can_reach_finish (const Glib::RefPtr< AsyncResult > &result)
	Finishes an async network connectivity test.

Glib::SignalProxy< void(bool)>	signal_network_changed ()

Glib::PropertyProxy_ReadOnly< bool >	property_network_available () const
	Whether the network is considered available.

Glib::PropertyProxy_ReadOnly< NetworkConnectivity >	property_connectivity () const
	More detailed information about the host's network connectivity.

Glib::PropertyProxy_ReadOnly< bool >	property_network_metered () const
	Whether the network is considered metered.

Public Member Functions inherited from Glib::Interface
	Interface ()
	A Default constructor.

	Interface (Interface &&src) noexcept

Interface &	operator= (Interface &&src) noexcept

	Interface (const Glib::Interface_Class &interface_class)
	Called by constructors of derived classes.

	Interface (GObject *castitem)
	Called by constructors of derived classes.

	~Interface () noexcept override

	Interface (const Interface &)=delete

Interface &	operator= (const Interface &)=delete

GObject *	gobj ()

const GObject *	gobj () const

Public Member Functions inherited from Glib::ObjectBase
	ObjectBase (const ObjectBase &)=delete

ObjectBase &	operator= (const ObjectBase &)=delete

void	set_property_value (const Glib::ustring & property_name, const Glib::ValueBase & value)
	You probably want to use a specific property_*() accessor method instead.

void	get_property_value (const Glib::ustring & property_name, Glib::ValueBase & value) const
	You probably want to use a specific property_*() accessor method instead.

template<class PropertyType >
void	set_property (const Glib::ustring & property_name, const PropertyType & value)
	You probably want to use a specific property_*() accessor method instead.

template<class PropertyType >
void	get_property (const Glib::ustring & property_name, PropertyType & value) const
	You probably want to use a specific property_*() accessor method instead.

template<class PropertyType >
PropertyType	get_property (const Glib::ustring & property_name) const
	You probably want to use a specific property_*() accessor method instead.

sigc::connection	connect_property_changed (const Glib::ustring & property_name, const sigc::slot< void()> &slot)
	You can use the signal_changed() signal of the property proxy instead.

sigc::connection	connect_property_changed (const Glib::ustring & property_name, sigc::slot< void()> &&slot)
	You can use the signal_changed() signal of the property proxy instead.

void	freeze_notify ()
	Increases the freeze count on object.

void	thaw_notify ()
	Reverts the effect of a previous call to freeze_notify().

virtual void	reference () const
	Increment the reference count for this object.

virtual void	unreference () const
	Decrement the reference count for this object.

GObject *	gobj ()
	Provides access to the underlying C GObject.

const GObject *	gobj () const
	Provides access to the underlying C GObject.

GObject *	gobj_copy () const
	Give a ref-ed copy to someone. Use for direct struct access.

Static Public Member Functions
static void	add_interface (GType gtype_implementer)

static GType	get_type ()
	Get the GType for this class, for use with the underlying GObject type system.

static Glib::RefPtr< NetworkMonitor >	get_default ()
	Gets the default NetworkMonitor for the system.

Protected Member Functions
	NetworkMonitor ()
	You should derive from this class to use it.

virtual void	on_network_changed (bool available)
	This is a default handler for the signal signal_network_changed().

Protected Member Functions inherited from Glib::ObjectBase
	ObjectBase ()
	This default constructor is called implicitly from the constructor of user-derived classes, even if, for instance, Gtk::Button calls a different ObjectBase constructor.

	ObjectBase (const char *custom_type_name)
	A derived constructor always overrides this choice.

	ObjectBase (const std::type_info &custom_type_info)
	This constructor is a special feature to allow creation of derived types on the fly, without having to use g_object_new() manually.

	ObjectBase (ObjectBase &&src) noexcept

ObjectBase &	operator= (ObjectBase &&src) noexcept

virtual	~ObjectBase () noexcept=0

void	initialize (GObject *castitem)

void	initialize_move (GObject castitem, Glib::ObjectBase previous_wrapper)

Related Symbols
(Note that these are not member symbols.)
Glib::RefPtr< Gio::NetworkMonitor >	wrap (GNetworkMonitor *object, bool take_copy=false)
	A Glib::wrap() method for this object.

Detailed Description

Network status monitor.

NetworkMonitor provides an easy-to-use cross-platform API for monitoring network connectivity. On Linux, the available implementations are based on the kernel's netlink interface and on NetworkManager.

There is also an implementation for use inside Flatpak sandboxes.

Since glibmm 2.44:

Constructor & Destructor Documentation

◆ NetworkMonitor() [1/2]

Gio::NetworkMonitor::NetworkMonitor ( )

protected

You should derive from this class to use it.

◆ NetworkMonitor() [2/2]

Gio::NetworkMonitor::NetworkMonitor ( NetworkMonitor && src )

noexcept

◆ ~NetworkMonitor()

Gio::NetworkMonitor::~NetworkMonitor ( )

overridenoexcept

Member Function Documentation

◆ add_interface()

static void Gio::NetworkMonitor::add_interface ( GType gtype_implementer )

static

◆ can_reach() [1/2]

bool Gio::NetworkMonitor::can_reach ( const Glib::RefPtr< SocketConnectable > & connectable )

A can_reach() convenience overload.

◆ can_reach() [2/2]

bool Gio::NetworkMonitor::can_reach	(	const Glib::RefPtr< SocketConnectable > &	connectable,
		const Glib::RefPtr< Cancellable > &	cancellable
	)

Attempts to determine whether or not the host pointed to by connectable can be reached, without actually trying to connect to it.

This may return true even when NetworkMonitor::property_network_available() is false, if, for example, monitor can determine that connectable refers to a host on a local network.

If monitor believes that an attempt to connect to connectable will succeed, it will return true. Otherwise, it will return false and set error to an appropriate error (such as Gio::Error::HOST_UNREACHABLE).

Note that although this does not attempt to connect to connectable, it may still block for a brief period of time (eg, trying to do multicast DNS on the local network), so if you do not want to block, you should use g_network_monitor_can_reach_async().

Since glibmm 2.44:

Parameters

connectable	A SocketConnectable.
cancellable	A Cancellable, or `nullptr`.

Returns: true if connectable is reachable, false if not.

Exceptions

Glib::Error

◆ can_reach_async()

void Gio::NetworkMonitor::can_reach_async	(	const Glib::RefPtr< SocketConnectable > &	connectable,
		const SlotAsyncReady &	slot,
		const Glib::RefPtr< Cancellable > &	cancellable
	)

◆ can_reach_finish()

bool Gio::NetworkMonitor::can_reach_finish ( const Glib::RefPtr< AsyncResult > & result )

Finishes an async network connectivity test.

See g_network_monitor_can_reach_async().

Since glibmm 2.44:

Parameters

result A AsyncResult.

Returns: true if network is reachable, false if not.

Exceptions

Glib::Error

◆ get_connectivity()

NetworkConnectivity Gio::NetworkMonitor::get_connectivity ( ) const

Gets a more detailed networking state than g_network_monitor_get_network_available().

If NetworkMonitor::property_network_available() is false, then the connectivity state will be Gio::NetworkConnectivity::LOCAL.

If NetworkMonitor::property_network_available() is true, then the connectivity state will be Gio::NetworkConnectivity::FULL (if there is full Internet connectivity), Gio::NetworkConnectivity::LIMITED (if the host has a default route, but appears to be unable to actually reach the full Internet), or Gio::NetworkConnectivity::PORTAL (if the host is trapped behind a "captive portal" that requires some sort of login or acknowledgement before allowing full Internet access).

Note that in the case of Gio::NetworkConnectivity::LIMITED and Gio::NetworkConnectivity::PORTAL, it is possible that some sites are reachable but others are not. In this case, applications can attempt to connect to remote servers, but should gracefully fall back to their "offline" behavior if the connection attempt fails.

Since glibmm 2.44:

Returns: The network connectivity state.

◆ get_default()

static Glib::RefPtr< NetworkMonitor > Gio::NetworkMonitor::get_default ( )

static

Gets the default NetworkMonitor for the system.

Since glibmm 2.44:

Returns: A NetworkMonitor, which will be a dummy object if no network monitor is available.

◆ get_network_available()

bool Gio::NetworkMonitor::get_network_available ( ) const

Checks if the network is available.

"Available" here means that the system has a default route available for at least one of IPv4 or IPv6. It does not necessarily imply that the public Internet is reachable. See NetworkMonitor::property_network_available() for more details.

Since glibmm 2.44:

Returns: Whether the network is available.

◆ get_network_metered()

bool Gio::NetworkMonitor::get_network_metered ( ) const

Checks if the network is metered.

See NetworkMonitor::property_network_metered() for more details.

Since glibmm 2.46:

Returns: Whether the connection is metered.

◆ get_type()

static GType Gio::NetworkMonitor::get_type ( )

static

Get the GType for this class, for use with the underlying GObject type system.

◆ gobj() [1/2]

GNetworkMonitor * Gio::NetworkMonitor::gobj ( )

inline

Provides access to the underlying C GObject.

◆ gobj() [2/2]

const GNetworkMonitor * Gio::NetworkMonitor::gobj ( ) const

inline

Provides access to the underlying C GObject.

◆ on_network_changed()

virtual void Gio::NetworkMonitor::on_network_changed ( bool available )

protectedvirtual

This is a default handler for the signal signal_network_changed().

◆ operator=()

NetworkMonitor & Gio::NetworkMonitor::operator= ( NetworkMonitor && src )

noexcept

◆ property_connectivity()

Glib::PropertyProxy_ReadOnly< NetworkConnectivity > Gio::NetworkMonitor::property_connectivity ( ) const

More detailed information about the host's network connectivity.

See g_network_monitor_get_connectivity() and NetworkConnectivity for more details.

Since glibmm 2.44:

Default value: Gio::NetworkConnectivity::FULL

Returns: A PropertyProxy_ReadOnly that allows you to get the value of the property, or receive notification when the value of the property changes.

◆ property_network_available()

Glib::PropertyProxy_ReadOnly< bool > Gio::NetworkMonitor::property_network_available ( ) const

Whether the network is considered available.

That is, whether the system has a default route for at least one of IPv4 or IPv6.

Real-world networks are of course much more complicated than this; the machine may be connected to a wifi hotspot that requires payment before allowing traffic through, or may be connected to a functioning router that has lost its own upstream connectivity. Some hosts might only be accessible when a VPN is active. Other hosts might only be accessible when the VPN is not active. Thus, it is best to use g_network_monitor_can_reach() or g_network_monitor_can_reach_async() to test for reachability on a host-by-host basis. (On the other hand, when the property is false, the application can reasonably expect that no remote hosts at all are reachable, and should indicate this to the user in its UI.)

Since glibmm 2.44:

Default value: false

Returns: A PropertyProxy_ReadOnly that allows you to get the value of the property, or receive notification when the value of the property changes.

◆ property_network_metered()

Glib::PropertyProxy_ReadOnly< bool > Gio::NetworkMonitor::property_network_metered ( ) const

Whether the network is considered metered.

That is, whether the system has traffic flowing through the default connection that is subject to limitations set by service providers. For example, traffic might be billed by the amount of data transmitted, or there might be a quota on the amount of traffic per month. This is typical with tethered connections (3G and 4G) and in such situations, bandwidth intensive applications may wish to avoid network activity where possible if it will cost the user money or use up their limited quota. Anything more than a few hundreds of kilobytes of data usage per hour should be avoided without asking permission from the user.

If more information is required about specific devices then the system network management API should be used instead (for example, NetworkManager or ConnMan).

If this information is not available then no networks will be marked as metered.

Since glibmm 2.46:

Default value: false

Returns: A PropertyProxy_ReadOnly that allows you to get the value of the property, or receive notification when the value of the property changes.

◆ signal_network_changed()

Glib::SignalProxy< void(bool)> Gio::NetworkMonitor::signal_network_changed ( )

Slot Prototype:: void on_my_network_changed(bool available)

Flags: Run Last

Emitted when the network configuration changes.

Since glibmm 2.44:

Parameters

available The current value of NetworkMonitor::property_network_available().

Friends And Related Symbol Documentation

◆ wrap()

Glib::RefPtr< Gio::NetworkMonitor > wrap	(	GNetworkMonitor *	object,
		bool	take_copy = `false`
	)

A Glib::wrap() method for this object.

Parameters

object	The C instance.
take_copy	False if the result should take ownership of the C instance. True if it should take a new copy or ref.

Returns: A C++ instance that wraps this C instance.

Public Member Functions

Static Public Member Functions

Protected Member Functions

Related Symbols

Detailed Description

Constructor & Destructor Documentation

◆ NetworkMonitor() [1/2]

◆ NetworkMonitor() [2/2]

◆ ~NetworkMonitor()

Member Function Documentation

◆ add_interface()

◆ can_reach() [1/2]

◆ can_reach() [2/2]

◆ can_reach_async()

◆ can_reach_finish()

◆ get_connectivity()

◆ get_default()

◆ get_network_available()

◆ get_network_metered()

◆ get_type()

◆ gobj() [1/2]

◆ gobj() [2/2]

◆ on_network_changed()

◆ operator=()

◆ property_connectivity()

◆ property_network_available()

◆ property_network_metered()

◆ signal_network_changed()

Friends And Related Symbol Documentation

◆ wrap()