QDBusError Class

The QDBusError class represents an error received from the D-Bus bus or from remote applications found in the bus. More...

Header:	#include <QDBusError>
qmake:	QT += dbus
Since:	Qt 4.2

This class was introduced in Qt 4.2.

• List of all members, including inherited members

Public Types

enum	ErrorType { NoError, Other, Failed, NoMemory, ServiceUnknown, …, InvalidInterface }

Public Functions

bool	isValid() const
QString	message() const
QString	name() const
void	swap(QDBusError &other)
QDBusError::ErrorType	type() const

Static Public Members

QString

errorString(QDBusError::ErrorType error)

Detailed Description

When dealing with the D-Bus bus service or with remote applications over D-Bus, a number of error conditions can happen. This error conditions are sometimes signalled by a returned error value or by a QDBusError.

C++ and Java exceptions are a valid analogy for D-Bus errors: instead of returning normally with a return value, remote applications and the bus may decide to throw an error condition. However, the Qt D-Bus implementation does not use the C++ exception-throwing mechanism, so you will receive QDBusErrors in the return reply (see QDBusReply::error()).

QDBusError objects are used to inspect the error name and message as received from the bus and remote applications. You should not create such objects yourself to signal error conditions when called from D-Bus: instead, use QDBusMessage::createError() and QDBusConnection::send().

See also QDBusConnection::send(), QDBusMessage, and QDBusReply.

Member Type Documentation

enum QDBusError::ErrorType

In order to facilitate verification of the most common D-Bus errors generated by the D-Bus implementation and by the bus daemon itself, QDBusError can be compared to a set of pre-defined values:

Constant	Value	Description
QDBusError::NoError	0	QDBusError is invalid (i.e., the call succeeded)
QDBusError::Other	1	QDBusError contains an error that is not one of the well-known ones
QDBusError::Failed	2	The call failed (org.freedesktop.DBus.Error.Failed)
QDBusError::NoMemory	3	Out of memory (org.freedesktop.DBus.Error.NoMemory)
QDBusError::ServiceUnknown	4	The called service is not known (org.freedesktop.DBus.Error.ServiceUnknown)
QDBusError::NoReply	5	The called method did not reply within the specified timeout (org.freedesktop.DBus.Error.NoReply)
QDBusError::BadAddress	6	The address given is not valid (org.freedesktop.DBus.Error.BadAddress)
QDBusError::NotSupported	7	The call/operation is not supported (org.freedesktop.DBus.Error.NotSupported)
QDBusError::LimitsExceeded	8	The limits allocated to this process/call/connection exceeded the pre-defined values (org.freedesktop.DBus.Error.LimitsExceeded)
QDBusError::AccessDenied	9	The call/operation tried to access a resource it isn't allowed to (org.freedesktop.DBus.Error.AccessDenied)
QDBusError::NoServer	10	Documentation doesn't say what this is for (org.freedesktop.DBus.Error.NoServer)
QDBusError::Timeout	11	Documentation doesn't say what this is for or how it's used (org.freedesktop.DBus.Error.Timeout)
QDBusError::NoNetwork	12	Documentation doesn't say what this is for (org.freedesktop.DBus.Error.NoNetwork)
QDBusError::AddressInUse	13	QDBusServer tried to bind to an address that is already in use (org.freedesktop.DBus.Error.AddressInUse)
QDBusError::Disconnected	14	The call/process/message was sent after QDBusConnection disconnected (org.freedesktop.DBus.Error.Disconnected)
QDBusError::InvalidArgs	15	The arguments passed to this call/operation are not valid (org.freedesktop.DBus.Error.InvalidArgs)
QDBusError::UnknownMethod	16	The method called was not found in this object/interface with the given parameters (org.freedesktop.DBus.Error.UnknownMethod)
QDBusError::TimedOut	17	Documentation doesn't say... (org.freedesktop.DBus.Error.TimedOut)
QDBusError::InvalidSignature	18	The type signature is not valid or compatible (org.freedesktop.DBus.Error.InvalidSignature)
QDBusError::UnknownInterface	19	The interface is not known in this object (org.freedesktop.DBus.Error.UnknownInterface)
QDBusError::UnknownObject	20	The object path points to an object that does not exist (org.freedesktop.DBus.Error.UnknownObject)
QDBusError::UnknownProperty	21	The property does not exist in this interface (org.freedesktop.DBus.Error.UnknownProperty)
QDBusError::PropertyReadOnly	22	The property set failed because the property is read-only (org.freedesktop.DBus.Error.PropertyReadOnly)
QDBusError::InternalError	23	An internal error occurred
QDBusError::InvalidObjectPath	25	The object path provided is invalid.
QDBusError::InvalidService	24	The service requested is invalid.
QDBusError::InvalidMember	27	The member is invalid.
QDBusError::InvalidInterface	26	The interface is invalid.

Member Function Documentation

[static] QString QDBusError::errorString(QDBusError::ErrorType error)

Returns the error name associated with error condition error.

This function was introduced in Qt 4.3.

bool QDBusError::isValid() const

Returns true if this is a valid error condition (i.e., if there was an error), otherwise false.

QString QDBusError::message() const

Returns the message that the callee associated with this error. Error messages are implementation defined and usually contain a human-readable error code, though this does not mean it is suitable for your end-users.

QString QDBusError::name() const

Returns this error's name. Error names are similar to D-Bus Interface names, like org.freedesktop.DBus.InvalidArgs.

See also type().

void QDBusError::swap(QDBusError &other)

Swaps this QDBusError instance with other.

QDBusError::ErrorType QDBusError::type() const

Returns this error's ErrorType.

See also ErrorType.