NAME¶
Net::DBus - Perl extension for the DBus message system
SYNOPSIS¶
####### Attaching to the bus ###########
use Net::DBus;
# Find the most appropriate bus
my $bus = Net::DBus->find;
# ... or explicitly go for the session bus
my $bus = Net::DBus->session;
# .... or explicitly go for the system bus
my $bus = Net::DBus->system
######## Accessing remote services #########
# Get a handle to the HAL service
my $hal = $bus->get_service("org.freedesktop.Hal");
# Get the device manager
my $manager = $hal->get_object("/org/freedesktop/Hal/Manager",
"org.freedesktop.Hal.Manager");
# List devices
foreach my $dev (@{$manager->GetAllDevices}) {
print $dev, "\n";
}
######### Providing services ##############
# Register a service known as 'org.example.Jukebox'
my $service = $bus->export_service("org.example.Jukebox");
DESCRIPTION¶
Net::DBus provides a Perl API for the DBus message system. The DBus Perl
interface is currently operating against the 0.32 development version of DBus,
but should work with later versions too, providing the API changes have not
been too drastic.
Users of this package are either typically, service providers in which case the
Net::DBus::Service and Net::DBus::Object modules are of most relevance, or are
client consumers, in which case Net::DBus::RemoteService and
Net::DBus::RemoteObject are of most relevance.
METHODS¶
- my $bus = Net::DBus->find(%params);
- Search for the most appropriate bus to connect to and
return a connection to it. The heuristic used for the search is
- If DBUS_STARTER_BUS_TYPE is set to 'session' attach
to the session bus
- Else If DBUS_STARTER_BUS_TYPE is set to 'system' attach
to the system bus
- Else If DBUS_SESSION_BUS_ADDRESS is set attach to the
session bus
- Else attach to the system bus
The optional "params" hash can contain be used to specify
connection options. The only support option at this time is
"nomainloop" which prevents the bus from being automatically
attached to the main Net::DBus::Reactor event loop.
- my $bus = Net::DBus->system(%params);
- Return a handle for the system message bus. Note that the
system message bus is locked down by default, so unless appropriate access
control rules are added in /etc/dbus/system.d/, an application may access
services, but won't be able to export services. The optional
"params" hash can contain be used to specify connection options.
The only support option at this time is "nomainloop" which
prevents the bus from being automatically attached to the main
Net::DBus::Reactor event loop.
- my $bus = Net::DBus->session(%params);
- Return a handle for the session message bus. The optional
"params" hash can contain be used to specify connection options.
The only support option at this time is "nomainloop" which
prevents the bus from being automatically attached to the main
Net::DBus::Reactor event loop.
- my $bus = Net::DBus->test(%params);
- Returns a handle for a virtual bus for use in unit tests.
This bus does not make any network connections, but rather has an
in-memory message pipeline. Consult Net::DBus::Test::MockConnection for
further details of how to use this special bus.
- my $bus = Net::DBus->new($address, %params);
- Return a connection to a specific message bus. The $address
parameter must contain the address of the message bus to connect to. An
example address for a session bus might look like
"unix:abstract=/tmp/dbus-PBFyyuUiVb,guid=191e0a43c3efc222e0818be556d67500",
while one for a system bus would look like
"unix:/var/run/dbus/system_bus_socket". The optional
"params" hash can contain be used to specify connection options.
The only support option at this time is "nomainloop" which
prevents the bus from being automatically attached to the main
Net::DBus::Reactor event loop.
- my $connection = $bus->get_connection;
- Return a handle to the underlying, low level connection
object associated with this bus. The returned object will be an instance
of the Net::DBus::Binding::Bus class. This method is not intended for use
by (most!) application developers, so if you don't understand what this is
for, then you don't need to be calling it!
- my $service = $bus->get_service($name);
- Retrieves a handle for the remote service identified by the
service name $name. The returned object will be an instance of the
Net::DBus::RemoteService class.
- my $service = $bus->export_service($name);
- Registers a service with the bus, returning a handle to the
service. The returned object is an instance of the Net::DBus::Service
class.
- my $object = $bus->get_bus_object;
- Retrieves a handle to the bus object,
"/org/freedesktop/DBus", provided by the service
"org.freedesktop.DBus". The returned object is an instance of
Net::DBus::RemoteObject
- my $name = $bus->get_unique_name;
- Retrieves the unique name of this client's connection to
the bus.
- my $name = $bus->get_service_owner($service);
- Retrieves the unique name of the client on the bus owning
the service named by the $service parameter.
DATA TYPING METHODS¶
These methods are not usually used, since most services provide introspection
data to inform clients of their data typing requirements. If introspection
data is incomplete, however, it may be necessary for a client to mark values
with specific data types. In such a case, the following methods can be used.
They are not, however, exported by default so must be requested at import time
by specifying 'use Net::DBus qw(:typing)'
- $typed_value = dbus_int16($value);
- Mark a value as being a signed, 16-bit integer.
- $typed_value = dbus_uint16($value);
- Mark a value as being an unsigned, 16-bit integer.
- $typed_value = dbus_int32($value);
- Mark a value as being a signed, 32-bit integer.
- $typed_value = dbus_uint32($value);
- Mark a value as being an unsigned, 32-bit integer.
- $typed_value = dbus_int64($value);
- Mark a value as being an unsigned, 64-bit integer.
- $typed_value = dbus_uint64($value);
- Mark a value as being an unsigned, 64-bit integer.
- $typed_value = dbus_double($value);
- Mark a value as being a double precision IEEE floating
point.
- $typed_value = dbus_byte($value);
- Mark a value as being an unsigned, byte.
- $typed_value = dbus_string($value);
- Mark a value as being a UTF-8 string. This is not usually
required since 'string' is the default data type for any Perl scalar
value.
- $typed_value = dbus_signature($value);
- Mark a value as being a UTF-8 string, whose contents is a
valid type signature
- $typed_value = dbus_object_path($value);
- Mark a value as being a UTF-8 string, whose contents is a
valid object path.
- $typed_value = dbus_boolean($value);
- Mark a value as being an boolean
- $typed_value = dbus_array($value);
- Mark a value as being an array
- $typed_value = dbus_struct($value);
- Mark a value as being a structure
- $typed_value = dbus_dict($value);
- Mark a value as being a dictionary
- $typed_value = dbus_variant($value);
- Mark a value as being a variant
SEE ALSO¶
Net::DBus, Net::DBus::RemoteService, Net::DBus::Service,
Net::DBus::RemoteObject, Net::DBus::Object, Net::DBus::Exporter,
Net::DBus::Dumper, Net::DBus::Reactor, "
dbus-monitor(1)",
"dbus-daemon-1(1)", "
dbus-send(1)",
<
http://dbus.freedesktop.org>,
AUTHOR¶
Daniel Berrange <dan@berrange.com>
COPYRIGHT¶
Copyright 2004-2011 by Daniel Berrange