/// <summary>
/// Displays a dialog with more detailed view of the current selection.
/// </summary>
private void ViewMI_Click(object sender, System.EventArgs e)
{
try
{
// check for valid selection.
if (AttributesLV.SelectedItems.Count != 1)
{
return;
}
ListViewItem selection = AttributesLV.SelectedItems[0];
// show values if an attribute collection.
if (typeof(OpcClientSdk.Hda.TsCHdaAttributeValueCollection).IsInstanceOfType(selection.Tag))
{
new AttributesViewDlg().ShowDialog(m_server, (OpcClientSdk.Hda.TsCHdaAttributeValueCollection)selection.Tag);
}
// show description of attribute.
else if (typeof(OpcClientSdk.Hda.TsCHdaAttribute).IsInstanceOfType(selection.Tag))
{
OpcClientSdk.Hda.TsCHdaAttribute attribute = (OpcClientSdk.Hda.TsCHdaAttribute)selection.Tag;
MessageBox.Show(attribute.Description, attribute.Name, MessageBoxButtons.OK);
}
}
catch (Exception exception)
{
MessageBox.Show(exception.Message);
}
}
/// <summary>
/// Displays the dialog until the user enters valid data or clicks cancel.
/// </summary>
private TsCHdaBrowseFilter PromptUser()
{
while (ShowDialog() == DialogResult.OK)
{
try
{
OpcClientSdk.Hda.TsCHdaAttribute attribute = (OpcClientSdk.Hda.TsCHdaAttribute)AttributeCB.SelectedItem;
if (attribute == null)
{
continue;
}
TsCHdaBrowseFilter filter = new TsCHdaBrowseFilter();
filter.AttributeID = attribute.ID;
filter.Operator = (TsCHdaOperator)OperatorCTRL.Value;
filter.FilterValue = FilterValueCTRL.Value;
return(filter);
}
catch (Exception e)
{
MessageBox.Show(e.Message);
}
}
return(null);
}
/// <summary>
/// Edits an item from the list.
/// </summary>
private void ViewMI_Click(object sender, System.EventArgs e)
{
try
{
// check for valid selection.
if (AttributesLV.SelectedItems.Count != 1)
{
return;
}
OpcClientSdk.Hda.TsCHdaAttribute attribute = (OpcClientSdk.Hda.TsCHdaAttribute)AttributesLV.SelectedItems[0].Tag;
// view an attribute.
MessageBox.Show(attribute.Description, attribute.Name);
}
catch (Exception exception)
{
MessageBox.Show(exception.Message);
}
}
/// <summary>
/// Handles a change to the selected attribute.
/// </summary>
private void AttributeCB_SelectedIndexChanged(object sender, System.EventArgs e)
{
try
{
// get current selection.
OpcClientSdk.Hda.TsCHdaAttribute attribute = (OpcClientSdk.Hda.TsCHdaAttribute)AttributeCB.SelectedItem;
if (attribute == null)
{
DescriptionLB.Text = "";
return;
}
// convert filter value to correct data type.
object value = FilterValueCTRL.Value;
if (value == null || value.GetType() != attribute.DataType)
{
try
{
FilterValueCTRL.Value = OpcClientSdk.OpcConvert.ChangeType(value, attribute.DataType);
}
catch
{
FilterValueCTRL.Value = OpcClientSdk.OpcConvert.ChangeType(null, attribute.DataType);
}
}
// update description.
DescriptionLB.Text = attribute.Description;
}
catch (Exception exception)
{
MessageBox.Show(exception.Message);
}
}
/// <summary>
/// Returns the value of the specified field.
/// </summary>
private object GetFieldValue(object attribute, int fieldID)
{
// display result code.
if (typeof(IOpcResult).IsInstanceOfType(attribute))
{
switch (fieldID)
{
case RESULT: { return(((OpcClientSdk.Hda.TsCHdaAttributeValueCollection)attribute).Result); }
}
}
// displaying attribute descriptions.
if (typeof(OpcClientSdk.Hda.TsCHdaAttribute).IsInstanceOfType(attribute))
{
if (AttributesLV.CheckBoxes)
{
switch (fieldID)
{
case NAME: { return(((OpcClientSdk.Hda.TsCHdaAttribute)attribute).Name); }
}
}
else
{
switch (fieldID)
{
case NAME: { return(((OpcClientSdk.Hda.TsCHdaAttribute)attribute).Name); }
case DATA_TYPE: { return(((OpcClientSdk.Hda.TsCHdaAttribute)attribute).DataType); }
case DESCRIPTION: { return(((OpcClientSdk.Hda.TsCHdaAttribute)attribute).Description); }
}
}
}
// displaying attribute results.
if (typeof(OpcClientSdk.Hda.TsCHdaAttributeValueCollection).IsInstanceOfType(attribute))
{
OpcClientSdk.Hda.TsCHdaAttributeValueCollection collection = (OpcClientSdk.Hda.TsCHdaAttributeValueCollection)attribute;
switch (fieldID)
{
case NAME:
{
OpcClientSdk.Hda.TsCHdaAttribute description = m_server.Attributes.Find(collection.AttributeID);
if (description != null)
{
return(description.Name);
}
return(null);
}
case NUM_VALUES:
{
if (collection.Count > 1)
{
return(collection.Count);
}
return(null);
}
case VALUE:
{
if (collection.Count == 1)
{
return(collection[0].Value);
}
return(null);
}
}
}
// displaying attribute values.
if (typeof(OpcClientSdk.Hda.TsCHdaAttributeValue).IsInstanceOfType(attribute))
{
switch (fieldID)
{
case TIMESTAMP: { return(((OpcClientSdk.Hda.TsCHdaAttributeValue)attribute).Timestamp); }
case VALUE: { return(((OpcClientSdk.Hda.TsCHdaAttributeValue)attribute).Value); }
}
}
return(null);
}