KDNSSD::ServiceBase Class

class KDNSSD::ServiceBase

Describes a service. More...

Header: #include <KDNSSD/ServiceBase>
CMake: find_package(KF6 REQUIRED COMPONENTS DNSSD)
target_link_libraries(mytarget PRIVATE KF6::DNSSD)
Inherited By:

KDNSSD::PublicService and KDNSSD::RemoteService

Public Functions

ServiceBase(const QString &name = QString(), const QString &type = QString(), const QString &domain = QString(), const QString &host = QString(), unsigned short port = 0)
QString domain() const
QString hostName() const
unsigned short port() const
QString serviceName() const
QMap<QString, QByteArray> textData() const
QString type() const
bool operator!=(const KDNSSD::ServiceBase &o) const
bool operator==(const KDNSSD::ServiceBase &o) const
bool domainIsLocal(const QString &domain)

Detailed Description

This class is used to describe a service. The service can be published by the current application (in which case it is probably a PublicService) or by another application, either on the current machine or a remote machine, in which case it is probably a RemoteService returned by ServiceBrowser.

Note: You should not normally need to create a ServiceBase object yourself.

See also PublicService.

Member Function Documentation

[explicit] ServiceBase::ServiceBase(const QString &name = QString(), const QString &type = QString(), const QString &domain = QString(), const QString &host = QString(), unsigned short port = 0)

Creates a ServiceBase object

Note that name, type and domain uniquely identify the service in the DNS-SD system, and host and port provide the actual location of the service.

For example, RemoteService populates host and port based on the name, type and domain attributes using the DNS-SD resolution system.

name is the service name

type is the service type

domain is the DNS-SD domain name for service

host is the host name of the service (a fully-qualified domain name)

port is the port number of the service

QString ServiceBase::domain() const

Returns the domain that the service belongs to.

It is "local." for link-local services.

QString ServiceBase::hostName() const

Returns the hostname of the service.

Only valid for local and resolved remote services.

Together with port(), this can be used to actually access the service.

See also RemoteService::resolve() and RemoteService::resolveAsync().

unsigned short ServiceBase::port() const

Returns the port number of the service.

Only valid for local and resolved remote services.

Together with hostName(), this can be used to actually access the service.

See also RemoteService::resolve() and RemoteService::resolveAsync().

QString ServiceBase::serviceName() const

Returns the name of the service.

QMap<QString, QByteArray> ServiceBase::textData() const

Returns additional text data associated with the service.

Only valid for local and resolved remote services.

This is data that provides additional information about the service. For example, it might be used to specify a printer queue on the printer server specified by hostName() and port().

You can check for the data that might be associated with a particular service on the service types list. If a key=value pair is given, this will appear with the value in a QByteArray indexed by the key. If the data is on its own (does not have an = in it), it will be used to index an empty QByteArray, and can be checked for with QMap::contains().

For example, if you are accessing the _ipp._tcp service, you might do something like:

 QString printerModel = "unknown";
 if (service->textData().contains("ty")) {
     printQueue = QString::fromUtf8(service->textData()["ty"].constData());
 }

since the TXT data of the IPP service may contain data like "ty=Apple LaserWriter Pro 630".

Note: You actually have to be a bit more clever than this, since the key should usually be case insensitive.

QString ServiceBase::type() const

Returns the type of the service.

This is always in the format _sometype._udp or _sometype._tcp.

See http://www.dns-sd.org for a full list of service types.

bool ServiceBase::operator!=(const KDNSSD::ServiceBase &o) const

Compares services based on name, type and domain.

This is enough to for unique identification and omitting port, host and text data allows to compare resolved and unresolved services

o is the service to compare this service to

Returns false if this service represents the same service (from the point of view of DNS-SD) as o, true otherwise

bool ServiceBase::operator==(const KDNSSD::ServiceBase &o) const

Compares services based on name, type and domain.

This is enough to for unique identification and omitting port, host and text data allows to compare resolved and unresolved services

o is the service to compare this service to

Returns true if this service represents the same service (from the point of view of DNS-SD) as o, false otherwise

Related Non-Members

bool domainIsLocal(const QString &domain)

Check if the domain is link-local.

Returns true if domain is link-local ('local.'), false otherwise