/// <summary>
/// Retrieves the values of multiple properties by their index.
/// Assumes that the GUID component of the property keys is the sensor's type GUID.
/// </summary>
/// <param name="propIndexes">The indexes of the properties to retrieve.</param>
/// <returns>An array that contains the property values.</returns>
/// <remarks>
/// The returned array will contain null values for some properties if the values could not be retrieved.
/// </remarks>
public object[] GetProperties(params int[] propIndexes)
{
if (propIndexes == null || propIndexes.Length == 0)
{
throw new ArgumentNullException("propIndexes");
}
IPortableDeviceKeyCollection keyCollection = new PortableDeviceKeyCollection();
try
{
IPortableDeviceValues valuesCollection;
Dictionary <PropertyKey, int> propKeyToIdx = new Dictionary <PropertyKey, int>();
for (int i = 0; i < propIndexes.Length; i++)
{
PropertyKey propKey = new PropertyKey(TypeId.Value, propIndexes[i]);
keyCollection.Add(ref propKey);
propKeyToIdx.Add(propKey, i);
}
object[] data = new object[propIndexes.Length];
HResult hr = nativeISensor.GetProperties(keyCollection, out valuesCollection);
if (hr == HResult.Ok)
{
try
{
if (valuesCollection == null)
{
return(data);
}
uint count = 0;
valuesCollection.GetCount(ref count);
for (uint i = 0; i < count; i++)
{
PropertyKey propKey = new PropertyKey();
using (PropVariant propVal = new PropVariant())
{
valuesCollection.GetAt(i, ref propKey, propVal);
int idx = propKeyToIdx[propKey];
data[idx] = propVal.Value;
}
}
}
finally
{
Marshal.ReleaseComObject(valuesCollection);
valuesCollection = null;
}
}
return(data);
}
finally
{
Marshal.ReleaseComObject(keyCollection);
}
}
/// <summary>
/// Retrieves the values of multiple properties by property key.
/// </summary>
/// <param name="propKeys">An array of properties to retrieve.</param>
/// <returns>A dictionary that contains the property keys and values.</returns>
public IDictionary <PropertyKey, object> GetProperties(PropertyKey[] propKeys)
{
if (propKeys == null || propKeys.Length == 0)
{
throw new ArgumentNullException("propKeys", "Property keys array must not be null or empty.");
}
IPortableDeviceKeyCollection keyCollection = new PortableDeviceKeyCollection( );
try
{
IPortableDeviceValues valuesCollection = null;
for (int i = 0; i < propKeys.Length; i++)
{
PropertyKey propKey = propKeys[i];
keyCollection.Add(ref propKey);
}
Dictionary <PropertyKey, object> data = new Dictionary <PropertyKey, object>( );
HRESULT hr = nativeISensor.GetProperties(keyCollection, out valuesCollection);
if (valuesCollection != null)
{
try
{
uint count = 0;
valuesCollection.GetCount(ref count);
for (uint i = 0; i < count; i++)
{
PropertyKey propKey = new PropertyKey();
PropVariant propVal = new PropVariant();
valuesCollection.GetAt(i, ref propKey, ref propVal);
try
{
data.Add(propKey, propVal.Value);
}
finally
{
propVal.Clear( );
}
}
}
finally
{
Marshal.ReleaseComObject(valuesCollection);
valuesCollection = null;
}
}
return(data);
}
finally
{
Marshal.ReleaseComObject(keyCollection);
keyCollection = null;
}
}
/// <summary>
/// Retrieves the values of multiple properties by property key.
/// </summary>
/// <param name="propKeys">An array of properties to retrieve.</param>
/// <returns>A dictionary that contains the property keys and values.</returns>
public IDictionary <PropertyKey, object> GetProperties(PropertyKey[] propKeys)
{
if (propKeys == null || propKeys.Length == 0)
{
throw new ArgumentException(LocalizedMessages.SensorEmptyProperties, "propKeys");
}
IPortableDeviceKeyCollection keyCollection = new PortableDeviceKeyCollection();
try
{
IPortableDeviceValues valuesCollection;
for (int i = 0; i < propKeys.Length; i++)
{
PropertyKey propKey = propKeys[i];
keyCollection.Add(ref propKey);
}
Dictionary <PropertyKey, object> data = new Dictionary <PropertyKey, object>();
HResult hr = nativeISensor.GetProperties(keyCollection, out valuesCollection);
if (CoreErrorHelper.Succeeded(hr) && valuesCollection != null)
{
try
{
uint count = 0;
valuesCollection.GetCount(ref count);
for (uint i = 0; i < count; i++)
{
PropertyKey propKey = new PropertyKey();
using (PropVariant propVal = new PropVariant())
{
valuesCollection.GetAt(i, ref propKey, propVal);
data.Add(propKey, propVal.Value);
}
}
}
finally
{
Marshal.ReleaseComObject(valuesCollection);
valuesCollection = null;
}
}
return(data);
}
finally
{
Marshal.ReleaseComObject(keyCollection);
keyCollection = null;
}
}