PEER_EVENT_CONNECTION_CHANGE_DATA structure (p2p.h)

A PEER_GRAPH_EVENT_DATA structure points to the PEER_EVENT_CONNECTION_CHANGE_DATA structure if one of the following peer events is triggered:

• PEER_GRAPH_EVENT_NEIGHBOR_CONNECTION
• PEER_GRAPH_EVENT_DIRECT_CONNECTION
• PEER_GROUP_EVENT_NEIGHBOR_CONNECTION
• PEER_GROUP_EVENT_DIRECT_CONNECTION

The PEER_EVENT_CONNECTION_CHANGE_DATA structure contains updated information that includes changes to a neighbor or direct connection.

Syntax

typedef struct peer_event_connection_change_data_tag {
  DWORD                  dwSize;
  PEER_CONNECTION_STATUS status;
  ULONGLONG              ullConnectionId;
  ULONGLONG              ullNodeId;
  ULONGLONG              ullNextConnectionId;
  HRESULT                hrConnectionFailedReason;
} PEER_EVENT_CONNECTION_CHANGE_DATA, *PPEER_EVENT_CONNECTION_CHANGE_DATA;

Members

dwSize

Specifies the size of a structure.

status

Specifies the type of change in a neighbor or direct connection. Valid values are the following.

Value	Meaning
PEER_CONNECTED	A new incoming or outgoing connection to the local node has been established.
PEER_CONNECTION_FAILED	An attempt to connect to a local node has failed. It is possible for a single attempt to connect to result in multiple connection failures. This will occur after the initial connection failure, when the peer infrastructure sets the ullNextConnectionId member to the Node ID and attempts a new connection. If the ullNextConnectionId member is 0, no further connections will be attempted.
PEER_DISCONNECTED	An existing connection has been disconnected.

ullConnectionId

Specifies the unique ID for a connection that has changed.

ullNodeId

Specifies the unique ID for the node that has changed.

ullNextConnectionId

Windows Vista or later. Contains the next available node ID that the grouping or graphing APIs will attempt to connect to when a connection fails. If this member has a value of 0, no further connections will be attempted.

hrConnectionFailedReason

Windows Vista or later. Specifies the type of error when a connection fails. hrConnectionFailedReason can return the following error codes.

Value	Description
PEER_E_CONNECTION_REFUSED	A connection has been established and refused. The remote node is already at maximum number of connections or a connection already exists.
PEER_E_CONNECTION_FAILED	An attempt to connect to a remote node has failed.
PEER_E_CONNECTION_NOT_AUTHENTICATED	A connection is lost during the authentication phase. This is the result of a network failure or the remote node breaking the connection.

Requirements

Requirement	Value
Minimum supported client	Windows XP with SP2 [desktop apps only],Windows XP with SP1 with the Advanced Networking Pack forWindows XP
Minimum supported server	None supported
Header	p2p.h

See also

PEER_GRAPH_EVENT_DATA

PEER_GROUP_EVENT_DATA