glibmm: Gio::Resolver Class Reference

Asynchronous and cancellable DNS resolver. More...

#include <giomm/resolver.h>

Inheritance diagram for Gio::Resolver:

[legend]

Public Types
enum class	RecordType { SRV = 1 , MX , TXT , SOA , NS }

enum class	NameLookupFlags { DEFAULT = 0x0 , IPV4_ONLY = 1 << 0 , IPV6_ONLY = 1 << 1 }

Public Types inherited from Glib::Object
using	DestroyNotify = void(*)(gpointer data)

Public Member Functions
	Resolver (Resolver &&src) noexcept

Resolver &	operator= (Resolver &&src) noexcept

	~Resolver () noexcept override

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

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

GResolver *	gobj_copy ()
	Provides access to the underlying C instance. The caller is responsible for unrefing it. Use when directly setting fields in structs.

std::vector< Glib::RefPtr< InetAddress > >	lookup_by_name (const Glib::ustring &hostname, const Glib::RefPtr< Cancellable > &cancellable)
	Synchronously resolves hostname to determine its associated IP address(es).

std::vector< Glib::RefPtr< InetAddress > >	lookup_by_name (const Glib::ustring &hostname)
	A lookup_by_name() convenience overload.

void	lookup_by_name_async (const Glib::ustring &hostname, const SlotAsyncReady &slot, const Glib::RefPtr< Cancellable > &cancellable)
	Begins asynchronously resolving hostname to determine its associated IP address(es), and eventually calls slot, which must call lookup_by_name_finish() to get the result.

void	lookup_by_name_async (const Glib::ustring &hostname, const SlotAsyncReady &slot)
	Begins asynchronously resolving hostname to determine its associated IP address(es), and eventually calls slot, which must call lookup_by_name_finish() to get the result.

std::vector< Glib::RefPtr< InetAddress > >	lookup_by_name_finish (const Glib::RefPtr< AsyncResult > &result)
	Retrieves the result of a call to g_resolver_lookup_by_name_async().

std::vector< Glib::RefPtr< InetAddress > >	lookup_by_name_with_flags (const Glib::ustring &hostname, NameLookupFlags flags, const Glib::RefPtr< Cancellable > &cancellable={})
	This differs from g_resolver_lookup_by_name() in that you can modify the lookup behavior with flags.

void	lookup_by_name_with_flags_async (const Glib::ustring &hostname, NameLookupFlags flags, const SlotAsyncReady &slot, const Glib::RefPtr< Cancellable > &cancellable={})
	Begins asynchronously resolving hostname to determine its associated IP address(es), and eventually calls slot, which must call g_resolver_lookup_by_name_with_flags_finish() to get the result.

std::vector< Glib::RefPtr< InetAddress > >	lookup_by_name_with_flags_finish (const Glib::RefPtr< AsyncResult > &result)
	Retrieves the result of a call to g_resolver_lookup_by_name_with_flags_async().

Glib::ustring	lookup_by_address (const Glib::RefPtr< InetAddress > &address, const Glib::RefPtr< Cancellable > &cancellable)
	Synchronously reverse-resolves address to determine its associated hostname.

Glib::ustring	lookup_by_address (const Glib::RefPtr< InetAddress > &address)
	A lookup_by_address() convenience overload.

void	lookup_by_address_async (const Glib::RefPtr< InetAddress > &address, const SlotAsyncReady &slot, const Glib::RefPtr< Cancellable > &cancellable)
	Begins asynchronously reverse-resolving an address to determine its associated hostname, and eventually calls callback, which must call lookup_by_address_finish() to get the final result.

void	lookup_by_address_async (const Glib::RefPtr< InetAddress > &address, const SlotAsyncReady &slot)
	Begins asynchronously reverse-resolving an address to determine its associated hostname, and eventually calls callback, which must call lookup_by_address_finish() to get the final result.

Glib::ustring	lookup_by_address_finish (const Glib::RefPtr< AsyncResult > &result)
	Retrieves the result of a previous call to g_resolver_lookup_by_address_async().

std::vector< SrvTarget >	lookup_service (const Glib::ustring &service, const Glib::ustring &protocol, const Glib::ustring & domain, const Glib::RefPtr< Cancellable > &cancellable)
	Synchronously performs a DNS SRV lookup for the given service and protocol in the given domain and returns an array of SrvTarget.

std::vector< SrvTarget >	lookup_service (const Glib::ustring &service, const Glib::ustring &protocol, const Glib::ustring & domain)
	A lookup_service() convenience overload.

void	lookup_service_async (const Glib::ustring &service, const Glib::ustring &protocol, const Glib::ustring & domain, const SlotAsyncReady &slot, const Glib::RefPtr< Cancellable > &cancellable)
	Begins asynchronously performing a DNS SRV lookup for the given service and protocol in the given domain, and eventually calls callback, which must call lookup_service_finish() to get the final result.

void	lookup_service_async (const Glib::ustring &service, const Glib::ustring &protocol, const Glib::ustring & domain, const SlotAsyncReady &slot)
	Begins asynchronously performing a DNS SRV lookup for the given service and protocol in the given domain, and eventually calls callback, which must call lookup_service_finish() to get the final result.

std::vector< SrvTarget >	lookup_service_finish (const Glib::RefPtr< AsyncResult > &result)
	Retrieves the result of a previous call to g_resolver_lookup_service_async().

std::vector< Glib::VariantContainerBase >	lookup_records (const Glib::ustring &rrname, RecordType record_type, const Glib::RefPtr< Cancellable > &cancellable)
	Synchronously performs a DNS record lookup for the given rrname and returns a list of records as Variant tuples.

std::vector< Glib::VariantContainerBase >	lookup_records (const Glib::ustring &rrname, RecordType record_type)
	A lookup_records() convenience overload.

void	lookup_records_async (const Glib::ustring &rrname, RecordType record_type, const SlotAsyncReady &slot, const Glib::RefPtr< Cancellable > &cancellable)
	Begins asynchronously performing a DNS lookup for the given rrname, and eventually calls slot, which must call lookup_records_finish() to get the final result.

void	lookup_records_async (const Glib::ustring &rrname, RecordType record_type, const SlotAsyncReady &slot)
	A non-cancellable version of lookup_records_async().

std::vector< Glib::VariantContainerBase >	lookup_records_finish (const Glib::RefPtr< AsyncResult > &result)
	Retrieves the result of a previous call to g_resolver_lookup_records_async().

unsigned	get_timeout () const
	Get the timeout applied to all resolver lookups.

void	set_timeout (unsigned timeout_ms)
	Set the timeout applied to all resolver lookups.

Glib::PropertyProxy< unsigned int >	property_timeout ()
	The timeout applied to all resolver lookups, in milliseconds.

Glib::PropertyProxy_ReadOnly< unsigned int >	property_timeout () const
	The timeout applied to all resolver lookups, in milliseconds.

Glib::SignalProxy< void()>	signal_reload ()

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

Object &	operator= (const Object &)=delete

	Object (Object &&src) noexcept

Object &	operator= (Object &&src) noexcept

void *	get_data (const QueryQuark & key)

void	set_data (const Quark & key, void *data)

void	set_data_with_c_callback (const Quark & key, void *data, GDestroyNotify notify)

void	set_data (const Quark & key, void *data, DestroyNotify notify)
	Prefer set_data_with_c_callback() with a callback with C linkage.

void	remove_data (const QueryQuark &quark)

void *	steal_data (const QueryQuark &quark)

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

static Glib::RefPtr< Resolver >	get_default ()

static void	set_default (const Glib::RefPtr< Resolver > &resolver)

Protected Member Functions
virtual void	on_reload ()
	This is a default handler for the signal signal_reload().

Protected Member Functions inherited from Glib::Object
	Object ()

	Object (const Glib::ConstructParams &construct_params)

	Object (GObject *castitem)

	~Object () noexcept override

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::Resolver >	wrap (GResolver *object, bool take_copy=false)
	A Glib::wrap() method for this object.

Related Symbols inherited from Glib::Object
Glib::RefPtr< Glib::Object >	wrap (GObject *object, bool take_copy=false)

Detailed Description

Asynchronous and cancellable DNS resolver.

Resolver provides cancellable synchronous and asynchronous DNS resolution, for hostnames (lookup_by_address(), lookup_by_name() and their async variants) and SRV (service) records (lookup_service()).

NetworkAddress and NetworkService provide wrappers around Resolver functionality that also implement SocketConnectable, making it easy to connect to a remote host/service.

Since glibmm 2.24:

Member Enumeration Documentation

◆ NameLookupFlags

enum class Gio::Resolver::NameLookupFlags

strong

Enumerator
DEFAULT	Default behavior (same as g_resolver_lookup_by_name()).
IPV4_ONLY	Only resolve ipv4 addresses.
IPV6_ONLY	Only resolve ipv6 addresses.

◆ RecordType

enum class Gio::Resolver::RecordType

strong

Enumerator
SRV	Look up DNS SRV records for a domain.
MX	Look up DNS MX records for a domain.
TXT	Look up DNS TXT records for a name.
SOA	Look up DNS SOA records for a zone.
NS	Look up DNS NS records for a domain.

Constructor & Destructor Documentation

◆ Resolver()

Gio::Resolver::Resolver ( Resolver && src )

noexcept

◆ ~Resolver()

Gio::Resolver::~Resolver ( )

overridenoexcept

Member Function Documentation

◆ get_default()

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

static

◆ get_timeout()

unsigned Gio::Resolver::get_timeout ( ) const

Get the timeout applied to all resolver lookups.

See Resolver::property_timeout().

Since glibmm 2.78:

Returns: The resolver timeout, in milliseconds, or 0 for no timeout.

◆ get_type()

static GType Gio::Resolver::get_type ( )

static

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

◆ gobj() [1/2]

GResolver * Gio::Resolver::gobj ( )

inline

Provides access to the underlying C GObject.

◆ gobj() [2/2]

const GResolver * Gio::Resolver::gobj ( ) const

inline

Provides access to the underlying C GObject.

◆ gobj_copy()

GResolver * Gio::Resolver::gobj_copy ( )

Provides access to the underlying C instance. The caller is responsible for unrefing it. Use when directly setting fields in structs.

◆ lookup_by_address() [1/2]

Glib::ustring Gio::Resolver::lookup_by_address ( const Glib::RefPtr< InetAddress > & address )

A lookup_by_address() convenience overload.

◆ lookup_by_address() [2/2]

Glib::ustring Gio::Resolver::lookup_by_address	(	const Glib::RefPtr< InetAddress > &	address,
		const Glib::RefPtr< Cancellable > &	cancellable
	)

Synchronously reverse-resolves address to determine its associated hostname.

If the DNS resolution fails, error (if non-nullptr) will be set to a value from ResolverError.

If cancellable is non-nullptr, it can be used to cancel the operation, in which case error (if non-nullptr) will be set to Gio::Error::CANCELLED.

Since glibmm 2.22:

Parameters

address	The address to reverse-resolve.
cancellable	A Cancellable, or `nullptr`.

Returns: A hostname (either ASCII-only, or in ASCII-encoded form), or nullptr on error.

Exceptions

Glib::Error

◆ lookup_by_address_async() [1/2]

void Gio::Resolver::lookup_by_address_async	(	const Glib::RefPtr< InetAddress > &	address,
		const SlotAsyncReady &	slot
	)

Begins asynchronously reverse-resolving an address to determine its associated hostname, and eventually calls callback, which must call lookup_by_address_finish() to get the final result.

Parameters

address	The address to reverse-resolve.
slot	A callback slot to call after the resolution completes.

◆ lookup_by_address_async() [2/2]

void Gio::Resolver::lookup_by_address_async	(	const Glib::RefPtr< InetAddress > &	address,
		const SlotAsyncReady &	slot,
		const Glib::RefPtr< Cancellable > &	cancellable
	)

Begins asynchronously reverse-resolving an address to determine its associated hostname, and eventually calls callback, which must call lookup_by_address_finish() to get the final result.

Parameters

address	The address to reverse-resolve.
slot	A callback slot to call after the resolution completes.
cancellable	A Cancellable object which can be used to cancel the operation.

◆ lookup_by_address_finish()

Glib::ustring Gio::Resolver::lookup_by_address_finish ( const Glib::RefPtr< AsyncResult > & result )

Retrieves the result of a previous call to g_resolver_lookup_by_address_async().

If the DNS resolution failed, error (if non-nullptr) will be set to a value from ResolverError. If the operation was cancelled, error will be set to Gio::Error::CANCELLED.

Since glibmm 2.22:

Parameters

result The result passed to your SlotAsyncReady.

Returns: A hostname (either ASCII-only, or in ASCII-encoded form), or nullptr on error.

Exceptions

Glib::Error

◆ lookup_by_name() [1/2]

std::vector< Glib::RefPtr< InetAddress > > Gio::Resolver::lookup_by_name ( const Glib::ustring & hostname )

A lookup_by_name() convenience overload.

◆ lookup_by_name() [2/2]

std::vector< Glib::RefPtr< InetAddress > > Gio::Resolver::lookup_by_name	(	const Glib::ustring &	hostname,
		const Glib::RefPtr< Cancellable > &	cancellable
	)

Synchronously resolves hostname to determine its associated IP address(es).

hostname may be an ASCII-only or UTF-8 hostname, or the textual form of an IP address (in which case this just becomes a wrapper around g_inet_address_new_from_string()).

On success, g_resolver_lookup_by_name() will return a non-empty List of InetAddress, sorted in order of preference and guaranteed to not contain duplicates. That is, if using the result to connect to hostname, you should attempt to connect to the first address first, then the second if the first fails, etc. If you are using the result to listen on a socket, it is appropriate to add each result using e.g. g_socket_listener_add_address().

If the DNS resolution fails, error (if non-nullptr) will be set to a value from ResolverError and nullptr will be returned.

If cancellable is non-nullptr, it can be used to cancel the operation, in which case error (if non-nullptr) will be set to Gio::Error::CANCELLED.

If you are planning to connect to a socket on the resolved IP address, it may be easier to create a NetworkAddress and use its SocketConnectable interface.

Since glibmm 2.22:

Parameters

hostname	The hostname to look up.
cancellable	A Cancellable, or `nullptr`.

Returns: A non-empty List of InetAddress, or nullptr on error. You must unref each of the addresses and free the list when you are done with it. (You can use g_resolver_free_addresses() to do this.).

Exceptions

Glib::Error

◆ lookup_by_name_async() [1/2]

void Gio::Resolver::lookup_by_name_async	(	const Glib::ustring &	hostname,
		const SlotAsyncReady &	slot
	)

Begins asynchronously resolving hostname to determine its associated IP address(es), and eventually calls slot, which must call lookup_by_name_finish() to get the result.

See lookup_by_name() for more details.

Parameters

hostname	The hostname to look up.
slot	A callback slot to call after the resolution completes.

◆ lookup_by_name_async() [2/2]

void Gio::Resolver::lookup_by_name_async	(	const Glib::ustring &	hostname,
		const SlotAsyncReady &	slot,
		const Glib::RefPtr< Cancellable > &	cancellable
	)

Begins asynchronously resolving hostname to determine its associated IP address(es), and eventually calls slot, which must call lookup_by_name_finish() to get the result.

See lookup_by_name() for more details.

Parameters

hostname	The hostname to look up.
slot	A callback slot to call after the resolution completes.
cancellable	A Cancellable object which can be used to cancel the operation.

◆ lookup_by_name_finish()

std::vector< Glib::RefPtr< InetAddress > > Gio::Resolver::lookup_by_name_finish ( const Glib::RefPtr< AsyncResult > & result )

Retrieves the result of a call to g_resolver_lookup_by_name_async().

If the DNS resolution failed, error (if non-nullptr) will be set to a value from ResolverError. If the operation was cancelled, error will be set to Gio::Error::CANCELLED.

Since glibmm 2.22:

Parameters

result The result passed to your SlotAsyncReady.

Returns: A List of InetAddress, or nullptr on error. See g_resolver_lookup_by_name() for more details.

Exceptions

Glib::Error

◆ lookup_by_name_with_flags()

std::vector< Glib::RefPtr< InetAddress > > Gio::Resolver::lookup_by_name_with_flags	(	const Glib::ustring &	hostname,
		NameLookupFlags	flags,
		const Glib::RefPtr< Cancellable > &	cancellable = `{}`
	)

This differs from g_resolver_lookup_by_name() in that you can modify the lookup behavior with flags.

For example this can be used to limit results with Gio::Resolver::NameLookupFlags::IPV4_ONLY.

Since glibmm 2.74:

Parameters

hostname	The hostname to look up.
flags	Extra ResolverNameLookupFlags for the lookup.
cancellable	A Cancellable, or `nullptr`.

Returns: A non-empty List of InetAddress, or nullptr on error. You must unref each of the addresses and free the list when you are done with it. (You can use g_resolver_free_addresses() to do this.).

Exceptions

Glib::Error

◆ lookup_by_name_with_flags_async()

void Gio::Resolver::lookup_by_name_with_flags_async	(	const Glib::ustring &	hostname,
		NameLookupFlags	flags,
		const SlotAsyncReady &	slot,
		const Glib::RefPtr< Cancellable > &	cancellable = `{}`
	)

Begins asynchronously resolving hostname to determine its associated IP address(es), and eventually calls slot, which must call g_resolver_lookup_by_name_with_flags_finish() to get the result.

See g_resolver_lookup_by_name() for more details.

Since glibmm 2.74:

Parameters

hostname	The hostname to look up the address of.
flags	Extra ResolverNameLookupFlags for the lookup.
cancellable	A Cancellable, or `nullptr`.
slot	Callback to call after resolution completes.

◆ lookup_by_name_with_flags_finish()

std::vector< Glib::RefPtr< InetAddress > > Gio::Resolver::lookup_by_name_with_flags_finish ( const Glib::RefPtr< AsyncResult > & result )

Retrieves the result of a call to g_resolver_lookup_by_name_with_flags_async().

If the DNS resolution failed, error (if non-nullptr) will be set to a value from ResolverError. If the operation was cancelled, error will be set to Gio::Error::CANCELLED.

Since glibmm 2.74:

Parameters

result The result passed to your SlotAsyncReady.

Returns: A List of InetAddress, or nullptr on error. See g_resolver_lookup_by_name() for more details.

Exceptions

Glib::Error

◆ lookup_records() [1/2]

std::vector< Glib::VariantContainerBase > Gio::Resolver::lookup_records	(	const Glib::ustring &	rrname,
		RecordType	record_type
	)

A lookup_records() convenience overload.

◆ lookup_records() [2/2]

std::vector< Glib::VariantContainerBase > Gio::Resolver::lookup_records	(	const Glib::ustring &	rrname,
		RecordType	record_type,
		const Glib::RefPtr< Cancellable > &	cancellable
	)

Synchronously performs a DNS record lookup for the given rrname and returns a list of records as Variant tuples.

See Gio::Resolver::RecordType for information on what the records contain for each record_type.

If the DNS resolution fails, error (if non-nullptr) will be set to a value from ResolverError and nullptr will be returned.

If cancellable is non-nullptr, it can be used to cancel the operation, in which case error (if non-nullptr) will be set to Gio::Error::CANCELLED.

Since glibmm 2.34:

Parameters

rrname	The DNS name to look up the record for.
record_type	The type of DNS record to look up.
cancellable	A Cancellable, or `nullptr`.

Returns: A non-empty List of Variant, or nullptr on error. You must free each of the records and the list when you are done with it. (You can use Glib::list_free_full() with Glib::variant_unref() to do this.).

Exceptions

Glib::Error

◆ lookup_records_async() [1/2]

void Gio::Resolver::lookup_records_async	(	const Glib::ustring &	rrname,
		RecordType	record_type,
		const SlotAsyncReady &	slot
	)

A non-cancellable version of lookup_records_async().

◆ lookup_records_async() [2/2]

void Gio::Resolver::lookup_records_async	(	const Glib::ustring &	rrname,
		RecordType	record_type,
		const SlotAsyncReady &	slot,
		const Glib::RefPtr< Cancellable > &	cancellable
	)

Begins asynchronously performing a DNS lookup for the given rrname, and eventually calls slot, which must call lookup_records_finish() to get the final result.

See lookup_records() for more details.

Parameters

rrname	The DNS name to lookup the record for.
record_type	The type of DNS record to lookup.
cancellable	A Cancellable.
slot	The slot to call after the resolution completes.

Since glibmm 2.36:

◆ lookup_records_finish()

std::vector< Glib::VariantContainerBase > Gio::Resolver::lookup_records_finish ( const Glib::RefPtr< AsyncResult > & result )

Retrieves the result of a previous call to g_resolver_lookup_records_async().

Returns a non-empty list of records as Variant tuples. See Gio::Resolver::RecordType for information on what the records contain.

If the DNS resolution failed, error (if non-nullptr) will be set to a value from ResolverError. If the operation was cancelled, error will be set to Gio::Error::CANCELLED.

Since glibmm 2.34:

Parameters

result The result passed to your SlotAsyncReady.

Returns: A non-empty List of Variant, or nullptr on error. You must free each of the records and the list when you are done with it. (You can use Glib::list_free_full() with Glib::variant_unref() to do this.).

Exceptions

Glib::Error

◆ lookup_service() [1/2]

std::vector< SrvTarget > Gio::Resolver::lookup_service	(	const Glib::ustring &	service,
		const Glib::ustring &	protocol,
		const Glib::ustring &	domain
	)

A lookup_service() convenience overload.

◆ lookup_service() [2/2]

std::vector< SrvTarget > Gio::Resolver::lookup_service	(	const Glib::ustring &	service,
		const Glib::ustring &	protocol,
		const Glib::ustring &	domain,
		const Glib::RefPtr< Cancellable > &	cancellable
	)

Synchronously performs a DNS SRV lookup for the given service and protocol in the given domain and returns an array of SrvTarget.

domain may be an ASCII-only or UTF-8 hostname. Note also that the service and protocol arguments do not include the leading underscore that appears in the actual DNS entry.

On success, g_resolver_lookup_service() will return a non-empty List of SrvTarget, sorted in order of preference. (That is, you should attempt to connect to the first target first, then the second if the first fails, etc.)

If the DNS resolution fails, error (if non-nullptr) will be set to a value from ResolverError and nullptr will be returned.

If cancellable is non-nullptr, it can be used to cancel the operation, in which case error (if non-nullptr) will be set to Gio::Error::CANCELLED.

If you are planning to connect to the service, it is usually easier to create a NetworkService and use its SocketConnectable interface.

Since glibmm 2.22:

Parameters

service	The service type to look up (eg, "ldap").
protocol	The networking protocol to use for service (eg, "tcp").
domain	The DNS domain to look up the service in.
cancellable	A Cancellable, or `nullptr`.

Returns: A non-empty List of SrvTarget, or nullptr on error. You must free each of the targets and the list when you are done with it. (You can use g_resolver_free_targets() to do this.).

Exceptions

Glib::Error

◆ lookup_service_async() [1/2]

void Gio::Resolver::lookup_service_async	(	const Glib::ustring &	service,
		const Glib::ustring &	protocol,
		const Glib::ustring &	domain,
		const SlotAsyncReady &	slot
	)

Begins asynchronously performing a DNS SRV lookup for the given service and protocol in the given domain, and eventually calls callback, which must call lookup_service_finish() to get the final result.

See glookup_service() for more details.

Parameters

service	The service type to look up (eg, "ldap").
protocol	The networking protocol to use for service (eg, "tcp")
domain	The DNS domain to look up the service in.
slot	A callback slot to call after the resolution completes.

◆ lookup_service_async() [2/2]

void Gio::Resolver::lookup_service_async	(	const Glib::ustring &	service,
		const Glib::ustring &	protocol,
		const Glib::ustring &	domain,
		const SlotAsyncReady &	slot,
		const Glib::RefPtr< Cancellable > &	cancellable
	)

See glookup_service() for more details.

Parameters

service	The service type to look up (eg, "ldap").
protocol	The networking protocol to use for service (eg, "tcp")
domain	The DNS domain to look up the service in.
slot	A callback slot to call after the resolution completes.
cancellable	A Cancellable object which can be used to cancel the operation.

◆ lookup_service_finish()

std::vector< SrvTarget > Gio::Resolver::lookup_service_finish ( const Glib::RefPtr< AsyncResult > & result )

Retrieves the result of a previous call to g_resolver_lookup_service_async().

If the DNS resolution failed, error (if non-nullptr) will be set to a value from ResolverError. If the operation was cancelled, error will be set to Gio::Error::CANCELLED.

Since glibmm 2.22:

Parameters

result The result passed to your SlotAsyncReady.

Returns: A non-empty List of SrvTarget, or nullptr on error. See g_resolver_lookup_service() for more details.

Exceptions

Glib::Error

◆ on_reload()

virtual void Gio::Resolver::on_reload ( )

protectedvirtual

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

◆ operator=()

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

noexcept

◆ property_timeout() [1/2]

Glib::PropertyProxy< unsigned int > Gio::Resolver::property_timeout ( )

The timeout applied to all resolver lookups, in milliseconds.

This may be changed through the lifetime of the Resolver. The new value will apply to any lookups started after the change, but not to any already-ongoing lookups.

If this is 0, no timeout is applied to lookups.

No timeout was applied to lookups before this property was added in GLib 2.78.

Since glibmm 2.78:

Default value: 0

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

◆ property_timeout() [2/2]

Glib::PropertyProxy_ReadOnly< unsigned int > Gio::Resolver::property_timeout ( ) const

The timeout applied to all resolver lookups, in milliseconds.

This may be changed through the lifetime of the Resolver. The new value will apply to any lookups started after the change, but not to any already-ongoing lookups.

If this is 0, no timeout is applied to lookups.

No timeout was applied to lookups before this property was added in GLib 2.78.

Since glibmm 2.78:

Default value: 0

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

◆ set_default()

static void Gio::Resolver::set_default ( const Glib::RefPtr< Resolver > & resolver )

static

◆ set_timeout()

void Gio::Resolver::set_timeout ( unsigned timeout_ms )

Set the timeout applied to all resolver lookups.

See Resolver::property_timeout().

Since glibmm 2.78:

Parameters

timeout_ms Timeout in milliseconds, or 0 for no timeouts.

◆ signal_reload()

Glib::SignalProxy< void()> Gio::Resolver::signal_reload ( )

Slot Prototype:: void on_my_reload()

Flags: Run Last

Emitted when the resolver notices that the system resolver configuration has changed.

Friends And Related Symbol Documentation

◆ wrap()

Glib::RefPtr< Gio::Resolver > wrap	(	GResolver *	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 Types

Public Member Functions

Static Public Member Functions

Protected Member Functions

Related Symbols

Detailed Description

Member Enumeration Documentation

◆ NameLookupFlags

◆ RecordType

Constructor & Destructor Documentation

◆ Resolver()

◆ ~Resolver()

Member Function Documentation

◆ get_default()

◆ get_timeout()

◆ get_type()

◆ gobj() [1/2]

◆ gobj() [2/2]

◆ gobj_copy()

◆ lookup_by_address() [1/2]

◆ lookup_by_address() [2/2]

◆ lookup_by_address_async() [1/2]

◆ lookup_by_address_async() [2/2]

◆ lookup_by_address_finish()

◆ lookup_by_name() [1/2]

◆ lookup_by_name() [2/2]

◆ lookup_by_name_async() [1/2]

◆ lookup_by_name_async() [2/2]

◆ lookup_by_name_finish()

◆ lookup_by_name_with_flags()

◆ lookup_by_name_with_flags_async()

◆ lookup_by_name_with_flags_finish()

◆ lookup_records() [1/2]

◆ lookup_records() [2/2]

◆ lookup_records_async() [1/2]

◆ lookup_records_async() [2/2]

◆ lookup_records_finish()

◆ lookup_service() [1/2]

◆ lookup_service() [2/2]

◆ lookup_service_async() [1/2]

◆ lookup_service_async() [2/2]

◆ lookup_service_finish()

◆ on_reload()

◆ operator=()

◆ property_timeout() [1/2]

◆ property_timeout() [2/2]

◆ set_default()

◆ set_timeout()

◆ signal_reload()

Friends And Related Symbol Documentation

◆ wrap()