Notification errors

The members of the PrintAsyncNotifyError enumerated type are used to signify the type of error that occurred. The following table describes the possible error codes.

Error code	Value	Communication type	Applies to	Description
CHANNEL_CLOSED_BY_SERVER	0x01			SendNotification and CloseChannel return this value when the print spooler closed the channel prior to the call.
CHANNEL_CLOSED_BY_ANOTHER_LISTENER	0x02	Bidirectional	Listener	SendNotification and CloseChannel return this value when another listener closed the channel prior to the call.
CHANNEL_CLOSED_BY_SAME_LISTENER	0x03	Bidirectional	Sender	CloseChannel returns this value when the same listener closed the channel prior to the call.
CHANNEL_RELEASED_BY_LISTENER	0x04			SendNotification and CloseChannel return this value when another listener released the channel prior to the call.
UNIRECTIONAL_NOTIFICATION_LOST	0x05	Unidirectional	Sender	SendNotification returns this value to the sender when one or more of the present listeners did not receive the notification. This can occur when the sender sends notifications faster than the listeners can process.
ASYNC_NOTIFICATION_FAILURE	0x06	Unidirectional	Sender	SendNotification returns this value to the sender when none of the present listeners receive the notification. This situation can occur in some limited system resource conditions..
NO_LISTENERS	0x07	Unidirectional	Sender	SendNotification returns this value to the sender as a non-error to indicate that no listeners are registered.
CHANNEL_ALREADY_CLOSED	0x08	Bidirectional	Sender and Listener	SendNotification returns this value when the channel was already closed.
CHANNEL_ALREADY_OPENED	0x09	Bidirectional and Unidirectional	Sender and Listener	CreateNotificationChannel returns this value when the channel is already open.
CHANNEL_WAITING_FOR_CLIENT_NOTIFICATION	0x0a	Bidirectional	Sender	SendNotification returns this value when the channel is waiting for a client notification.
CHANNEL_NOT_OPENED	0x0b	Bidirectional and Unidirectional	Sender	CreateNotificationChannel returns this value when the channel has not been opened.
ASYNC_CALL_ALREADY_PARKED	0x0c	Bidirectional and Unidirectional	Sender (Internal)	A call has already been placed on this channel. More than one call per channel at a time is not allowed.
NOT_REGISTERED	0x0d			UnregisterForNotifications returns this value when the registration object has not been registered.
ALREADY_UNREGISTERED	0x0e	Bidirectional and Unidirectional	Listener	UnregisterForNotifications returns this value when the registration object has already been unregistered.
ALREADY_REGISTERED	0x0f	Bidirectional and Unidirectional	Listener	RegisterForNotifications returns this value when the registration object has already been registered.
CHANNEL_ACQUIRED	0x10	Bidirectional	Sender	SendNotification and CloseChannel return this value when another listener acquires the channel.
ASYNC_CALL_IN_PROGRESS	0x11	Bidirectional	Sender	SendNotification returns this value when a call is already in progress. Only one call per channel is allowed at a time.
MAX_NOTIFICATION_SIZE_EXCEEDED	0x12	Bidirectional and Unidirectional	Sender	SendNotification returns this value when the notification data size exceeds the maximum allowed.
INTERNAL_NOTIFICATION_QUEUE_IS_FULL	0x13	Bidirectional and Unidirectional	Sender	OnEventNotify returns this value when the notification queue is full.
INVALID_NOTIFICATION_TYPE	0x14	Bidirectional and Unidirectional	Sender	SendNotification returns this value when the notification's type is different than the channel's type.
MAX_REGISTRATION_COUNT_EXCEEDED	0x15	Bidirectional and Unidirectional	Listener	RegisterForNotifications returns this value when the number of registrations exceeds the maximum number that is allowed.
MAX_CHANNEL_COUNT_EXCEEDED	0x16	Bidirectional and Unidirectional	Sender	CreatePrintNotificationChannel returns this value when the number of channels exceeds the maximum number that is allowed.