/// <summary>
/// Allocates and marshals an array of OPCBROWSEELEMENT structures.
/// </summary>
internal static IntPtr GetItemStates(TsCDaItemValueResult[] input)
{
IntPtr output = IntPtr.Zero;
if (input != null && input.Length > 0)
{
output = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(OpcRcw.Da.OPCITEMSTATE)) * input.Length);
IntPtr pos = output;
for (int ii = 0; ii < input.Length; ii++)
{
OpcRcw.Da.OPCITEMSTATE item = new OpcRcw.Da.OPCITEMSTATE();
item.hClient = System.Convert.ToInt32(input[ii].ClientHandle);
item.vDataValue = input[ii].Value;
item.wQuality = (input[ii].QualitySpecified) ? input[ii].Quality.GetCode() : (short)0;
item.ftTimeStamp = Convert(Technosoftware.DaAeHdaClient.Com.Interop.GetFILETIME(input[ii].Timestamp));
item.wReserved = 0;
Marshal.StructureToPtr(item, pos, false);
pos = (IntPtr)(pos.ToInt64() + Marshal.SizeOf(typeof(OpcRcw.Da.OPCITEMSTATE)));
}
}
return(output);
}
/// <summary>
/// Unmarshals and deallocates a OPCITEMSTATE structures.
/// </summary>
internal static TsCDaItemValue[] GetItemValues(ref IntPtr pInput, int count, bool deallocate)
{
TsCDaItemValue[] output = null;
if (pInput != IntPtr.Zero && count > 0)
{
output = new TsCDaItemValue[count];
IntPtr pos = pInput;
for (int ii = 0; ii < count; ii++)
{
OpcRcw.Da.OPCITEMSTATE result = (OpcRcw.Da.OPCITEMSTATE)Marshal.PtrToStructure(pos, typeof(OpcRcw.Da.OPCITEMSTATE));
output[ii] = new TsCDaItemValue();
output[ii].ClientHandle = result.hClient;
output[ii].Value = result.vDataValue;
output[ii].Quality = new TsCDaQuality(result.wQuality);
output[ii].QualitySpecified = true;
output[ii].Timestamp = Technosoftware.DaAeHdaClient.Com.Interop.GetFILETIME(Convert(result.ftTimeStamp));
output[ii].TimestampSpecified = output[ii].Timestamp != DateTime.MinValue;
if (deallocate)
{
Marshal.DestroyStructure(pos, typeof(OpcRcw.Da.OPCITEMSTATE));
}
pos = (IntPtr)(pos.ToInt64() + Marshal.SizeOf(typeof(OpcRcw.Da.OPCITEMSTATE)));
}
if (deallocate)
{
Marshal.FreeCoTaskMem(pInput);
pInput = IntPtr.Zero;
}
}
return(output);
}
