/// <summary>
/// Expands the drop down list of the ComboBox to display available servers and endpoints.
/// </summary>
/// <param name="sender">The source of the event.</param>
/// <param name="e">The <see cref="System.EventArgs"/> instance containing the event data.</param>
private void UrlCB_DropDown(object sender, EventArgs e)
{
// get discovery url
string sUrl;
// Check the text property of the Server textbox
if (NodeTB.Text.Length == 0)
{
// Set the uri of the local discovery server by default.
sUrl = "opc.tcp://localhost:4840";
}
else
{
// Has the port been entered by the user?
char seperator = ':';
string[] strPortCheck = NodeTB.Text.Split(seperator);
if (strPortCheck.Length > 1)
{
sUrl = NodeTB.Text;
}
else
{
sUrl = NodeTB.Text + ":4840";
}
}
// Set wait cursor.
Cursor = Cursors.WaitCursor;
// Clear all items of the ComboBox.
UrlCB.Items.Clear();
UrlCB.Text = "";
// Look for servers
List <ApplicationDescription> serverList = null;
using (Discovery discovery = new Discovery(m_Application))
{
try
{
serverList = discovery.FindServers(sUrl);
}
catch (Exception exception)
{
// Update status label.
toolStripStatusLabel.Text = "FindServers failed:" + exception.Message;
toolStripStatusLabel.Image = RabbitMQ_SendClient.Properties.Resources.error;
// Set default cursor.
Cursor = Cursors.Default;
return;
}
bool bGetEndpointsError = false;
bool bIgnoreError = false;
string errorText = "";
List <EndpointWrapper> lstEndpointWrappers = new List <EndpointWrapper>();
// Populate the drop down list with the endpoints for the available servers.
foreach (ApplicationDescription server in serverList)
{
if (server.ApplicationType == ApplicationType.Client || server.ApplicationType == ApplicationType.DiscoveryServer)
{
continue;
}
try
{
StringCollection lstEndpoint = new StringCollection();
foreach (string discoveryUrl in server.DiscoveryUrls)
{
// Call GetEndpoints
List <EndpointDescription> lstEndpoints = null;
try
{
lstEndpoints = discovery.GetEndpoints(discoveryUrl);
foreach (EndpointDescription endpoint in lstEndpoints)
{
// build display name for combo
EndpointWrapper endpointWrap = new EndpointWrapper(endpoint);
if (!lstEndpoint.Contains(endpointWrap.ToString()))
{
lstEndpointWrappers.Add(endpointWrap);
lstEndpoint.Add(endpointWrap.ToString());
bIgnoreError = true;
}
}
}
catch (Exception)
{
continue;
}
}
}
catch (Exception exception)
{
// Update status label.
errorText = "GetEndpoints failed. Error: " + exception.Message;
bGetEndpointsError = true;
}
}
// error occured during get endpoints
if (bGetEndpointsError && !bIgnoreError)
{
// Update status label.
toolStripStatusLabel.Text = "GetEndpoints failed. Error: " + errorText;
toolStripStatusLabel.Image = RabbitMQ_SendClient.Properties.Resources.error;
}
// add list of endpoints
else
{
UrlCB.Items.AddRange(lstEndpointWrappers.ToArray());
}
}
// Set default cursor.
Cursor = Cursors.Default;
}
/// <summary>
/// Connect to server.
/// </summary>
private int Connect()
{
if (m_Session == null)
{
m_Session = new Session(m_Application);
m_Session.UseDnsNameAndPortFromDiscoveryUrl = true;
// Attach to events
m_Session.ConnectionStatusUpdate += new ServerConnectionStatusUpdateEventHandler(Session_ServerConnectionStatusUpdate);
}
// Check the content of the combobox.
if (UrlCB.Text.Length == 0)
{
return(-1);
}
// Set wait cursor.
Cursor = Cursors.WaitCursor;
int result = 0;
try
{
string endpointUrl;
// Extract Url from combobox text.
object item = UrlCB.SelectedItem;
if ((item == null) || (item.GetType() == typeof(string)))
{
// The URL has been entered as text.
endpointUrl = UrlCB.Text;
// Call connect with URL
m_Session.Connect(endpointUrl, SecuritySelection.None);
}
else
{
// The endpoint was provided through discovery.
EndpointWrapper endpoint = (EndpointWrapper)item;
// Call connect with endpoint
m_Session.Connect(endpoint.Endpoint, null);
}
}
catch (Exception e)
{
result = -1;
// Update status label.
StatusException se = e as StatusException;
if (se != null)
{
toolStripStatusLabel.Text = String.Concat("Connect failed. Error [", se.StatusCode.ToString(), "] ", e.Message);
}
else
{
toolStripStatusLabel.Text = "Connect failed. Error: " + e.Message;
}
toolStripStatusLabel.Image = RabbitMQ_SendClient.Properties.Resources.error;
}
// Set default cursor.
Cursor = Cursors.Default;
return(result);
}
