private void EpConnectButton_Click(object sender, EventArgs e)
{
//Check if sessions exists; If yes > delete subscriptions and disconnect
if (mySession != null && !mySession.Disposed)
{
try
{
//mySubscription.Delete(true);
}
catch
{
;
}
myClientHelperAPI.Disconnect();
mySession = myClientHelperAPI.Session;
ResetUI();
}
else
{
try
{
//Register mandatory events (cert and keep alive)
myClientHelperAPI.KeepAliveNotification += new KeepAliveEventHandler(Notification_KeepAlive);
myClientHelperAPI.CertificateValidationNotification += new CertificateValidationEventHandler(Notification_ServerCertificate);
//Check for a selected endpoint
if (mySelectedEndpoint != null)
{
//Call connect
myClientHelperAPI.Connect(mySelectedEndpoint, userPwButton.Checked, userTextBox.Text, pwTextBox.Text).Wait();
//Extract the session object for further direct session interactions
mySession = myClientHelperAPI.Session;
//UI settings
epConnectServerButton.Text = "Disconnect from server";
browsePage.Enabled = true;
monitoringPage.Enabled = true;
myCertForm = null;
}
else
{
MessageBox.Show("Please select an endpoint before connecting", "Error");
return;
}
}
catch (Exception ex)
{
myCertForm = null;
ResetUI();
MessageBox.Show(ex.InnerException.Message, "Error");
}
}
}
/// <summary>
/// Global OPC UA event handlers
/// </summary>
#region OpcEventHandlers
private void Notification_ServerCertificate(CertificateValidator cert, CertificateValidationEventArgs e)
{
//Handle certificate here
//To accept a certificate manually move it to the root folder (Start > mmc.exe > add snap-in > certificates)
//Or handle via UAClientCertForm
if (this.InvokeRequired)
{
this.BeginInvoke(new CertificateValidationEventHandler(Notification_ServerCertificate), cert, e);
return;
}
try
{
//Search for the server's certificate in store; if found -> accept
X509Store store = new X509Store(StoreName.Root, StoreLocation.CurrentUser);
store.Open(OpenFlags.ReadOnly);
X509CertificateCollection certCol = store.Certificates.Find(X509FindType.FindByThumbprint, e.Certificate.Thumbprint, true);
store.Close();
if (certCol.Capacity > 0)
{
e.Accept = true;
}
//Show cert dialog if cert hasn't been accepted yet
else
{
if (!e.Accept & myCertForm == null)
{
myCertForm = new UAClientCertForm(e);
myCertForm.ShowDialog();
}
}
}
catch
{
;
}
}
