/// <summary>
/// Allocates and marshals an arary of OPCITEMPROPERTY structures.
/// </summary>
internal static OpcRcw.Da.OPCITEMPROPERTY GetItemProperty(ItemProperty input)
{
OpcRcw.Da.OPCITEMPROPERTY output = new OpcRcw.Da.OPCITEMPROPERTY();
if (input != null)
{
output.dwPropertyID = input.Id;
output.szDescription = input.Description;
output.vtDataType = input.DataType;
output.vValue = ComUtils.GetVARIANT(input.Value);
output.wReserved = 0;
output.hrErrorID = input.ErrorId;
}
return output;
}
/// <summary>
/// Gets the properties for the browse element.
/// </summary>
private List<ItemProperty> GetItemProperties(
INode node,
bool returnAllProperties,
int[] propertyIds,
bool returnPropertyValues)
{
int[] availablePropertyIds = GetAvailableProperties(node);
List<ItemProperty> properties = new List<ItemProperty>();
// determine whether any of the request properties are supported.
if (propertyIds != null && propertyIds.Length > 0)
{
for (int ii = 0; ii < propertyIds.Length; ii++)
{
bool exists = false;
for (int jj = 0; jj < availablePropertyIds.Length; jj++)
{
if (availablePropertyIds[jj] == propertyIds[ii])
{
exists = true;
break;
}
}
ItemProperty property = new ItemProperty();
property.Id = propertyIds[ii];
property.ErrorId = ResultIds.S_OK;
if (!exists)
{
property.ErrorId = ResultIds.E_INVALID_PID;
}
properties.Add(property);
}
}
// return all available properties.
else
{
for (int ii = 0; ii < availablePropertyIds.Length; ii++)
{
ItemProperty property = new ItemProperty();
property.Id = availablePropertyIds[ii];
property.ErrorId = ResultIds.S_OK;
properties.Add(property);
}
}
// get description and datatype.
List<int> valuesToFetch = new List<int>(properties.Count);
List<int> indexesForValues = new List<int>(properties.Count);
for (int ii = 0; ii < properties.Count; ii++)
{
ItemProperty property = properties[ii];
if (property.ErrorId == 0)
{
property.Description = PropertyIds.GetDescription(property.Id);
property.DataType = (short)PropertyIds.GetVarType(property.Id);
if (returnPropertyValues)
{
valuesToFetch.Add(property.Id);
indexesForValues.Add(ii);
}
}
}
// fetch any property values.
if (valuesToFetch.Count > 0)
{
try
{
int[] errors = null;
object[] values = ReadPropertyValues(node, valuesToFetch, out errors);
// update property objects.
for (int ii = 0; ii < errors.Length; ii++)
{
ItemProperty property = properties[indexesForValues[ii]];
property.Value = values[ii];
property.ErrorId = errors[ii];
if (property.ErrorId < 0)
{
property.Value = null;
}
}
}
catch (Exception e)
{
// update property objects with errors.
int error = Marshal.GetHRForException(e);
for (int ii = 0; ii < indexesForValues.Count; ii++)
{
ItemProperty property = properties[indexesForValues[ii]];
property.Value = null;
property.ErrorId = error;
}
}
}
// save the properties in the element.
return properties;
}
