public static ItemValue[] Read(int size, IntPtr dataPtr, IntPtr errorsPtr)
{
try
{
var position = 0;
var dataPtrAsLong = dataPtr.ToInt64();
var result = new ItemValue[size];
for (var i = 0; i < size; i++)
{
// ReSharper disable UseObjectOrCollectionInitializer
result[i] = new ItemValue();
// ReSharper restore UseObjectOrCollectionInitializer
// uint hClient;
result[i].ClientId = Marshal.ReadInt32(dataPtr, position);
position += sizeof (int);
// FILETIME ftTimeStamp;
var time = Marshal.ReadInt64(dataPtr, position);
result[i].Timestamp = DateTime.FromFileTimeUtc(time);
position += sizeof (long);
// ushort wQuality;
result[i].Quality = Marshal.ReadInt16(dataPtr, position);
position += sizeof (short);
// ushort wReserved;
position += sizeof (short);
// VARIANT vDataValue;
var variant = new IntPtr(dataPtrAsLong + position);
if (variant != IntPtr.Zero)
{
result[i].Value = Marshal.GetObjectForNativeVariant(variant);
NativeMethods.VariantClear(variant);
}
position += NativeMethods.VariantSize;
result[i].Error = Marshal.ReadInt32(errorsPtr, i * sizeof(int));
}
return result;
}
finally
{
Marshal.FreeCoTaskMem(dataPtr);
Marshal.FreeCoTaskMem(errorsPtr);
}
}
public static ItemValue[] Read(int[] clientIds, IntPtr values, short[] qualities, long[] timeStamps, int[] errors)
{
var result = new ItemValue[qualities.Length];
var position = 0;
var valuesAsLong = values.ToInt64();
for (var i = 0; i < clientIds.Length; i++)
{
var variant = new IntPtr(valuesAsLong + position);
position += NativeMethods.VariantSize;
result[i] = new ItemValue
{
ClientId = clientIds[i],
Timestamp = DateTime.FromFileTimeUtc(timeStamps[i]),
Quality = qualities[i],
Value = Marshal.GetObjectForNativeVariant(variant),
Error = errors[i],
};
}
return result;
}
public static ItemValue[] Read(int[] clientIds, IntPtr values, short[] qualities, long[] timeStamps, int[] errors)
{
var result = new ItemValue[qualities.Length];
var position = 0;
var valuesAsLong = values.ToInt64();
for (var i = 0; i < clientIds.Length; i++)
{
var variant = new IntPtr(valuesAsLong + position);
position += NativeMethods.VariantSize;
result[i] = new ItemValue
{
ClientId = clientIds[i],
Timestamp = DateTime.FromFileTimeUtc(timeStamps[i]),
Quality = qualities[i],
Value = Marshal.GetObjectForNativeVariant(variant),
Error = errors[i],
};
}
return(result);
}