/// <summary>
/// 断开连接
/// </summary>
/// <returns></returns>
public bool Disconnect()
{
RemoveSubscription();
uAClient.RemoveSubscription(_Subscription);
uAClient.Disconnect();
return(true);
}
private void Notification_KeepAlive(Session sender, KeepAliveEventArgs e)
{
if (this.InvokeRequired)
{
this.BeginInvoke(new KeepAliveEventHandler(Notification_KeepAlive), sender, e);
return;
}
// check for events from discarded sessions.
if (!Object.ReferenceEquals(sender, mySession))
{
return;
}
// check for disconnected session.
if (!ServiceResult.IsGood(e.Status))
{
// UpdateLog("Client", "Lost connection to server; Reconnect failed", false);
//Release connection
try
{
myHelperApi.RemoveSubscription(mySubscription);
}
catch
{
;
}
myHelperApi.Disconnect();
mySession = myHelperApi.Session;
// ClearUI();
}
}
public void RemoveSubscription()
{
if (m_Subscription != null)
{
m_Server.RemoveSubscription(m_Subscription);
m_Subscription = null;
}
}
/// <summary>
/// Starts the monitoring of the values of the two variables entered in the From.
/// The NodeIds used for the monitoring are constructed from the identifier entered
/// in the Form and the namespace index detected in the connect method
/// </summary>
private void btnMonitor_Click(object sender, EventArgs e)
{
// Check if we have a subscription
// - No -> Create a new subscription and create monitored items
// - Yes -> Delete Subcription
if (m_Subscription == null)
{
try
{
// Create subscription
m_Subscription = m_Server.Subscribe(1000);
m_Server.ItemChangedNotification += new MonitoredItemNotificationEventHandler(ClientApi_ValueChanged);
btnMonitor.Text = "Stop";
// Create first monitored item
m_Server.AddMonitoredItem(m_Subscription, new NodeId(txtIdentifier1.Text, m_NameSpaceIndex).ToString(), "item1", 100);
// Create second monitored item
m_Server.AddMonitoredItem(m_Subscription, new NodeId(txtIdentifier2.Text, m_NameSpaceIndex).ToString(), "item2", 100);
}
catch (Exception ex)
{
MessageBox.Show("Establishing data monitoring failed:\n\n" + ex.Message);
}
}
else
{
try
{
m_Server.RemoveSubscription(m_Subscription);
m_Subscription = null;
btnMonitor.Text = "Monitor";
txtMonitored1.Text = "";
txtMonitored2.Text = "";
}
catch (Exception ex)
{
MessageBox.Show("Stopping data monitoring failed:\n\n" + ex.Message);
}
}
}