I am converting a Windows Form from VB to C# and I ran in to an error when I attempted to do a synchronized read of my OPC tags.
I have this code:
public partial class FrmPartialMain : Form
{
RsiOPCAuto.OPCServer oOpcServer;
RsiOPCAuto.OPCGroup oOpcGroup;
int ClHandle; //this is set to 1 in another part of the code.
int SvHandle;
int OpcDsCashe = 1;
int OpcDsDevice = 2;
private void cmdSyncRead_Click(object sender, EventArgs e)
{
int lNumItems = oOpcGroup.OPCItems.Count; // = 3
int[] h = new int[lNumItems];
Array arValues = new int[lNumItems];
Array arHandles;
Array arErrors;
object Qualities;
object Timestamps;
h[ClHandle - 1] = oOpcGroup.OPCItems.Item(ClHandle).ServerHandle;
arHandles = (Array)h;
//Error on the next line bellow.
oOpcGroup.SyncRead((short)OpcDsDevice, lNumItems, ref arHandles, out arValues, out arErrors, out Qualities, out Timestamps);
txtSubValue.Text = Convert.ToString(arValues.GetValue(0));
}
}
oOpcGroup.Read() reads the value, quality and timestamp information for one or more items in a group. and the return type looks like this:
SyncRead(short Source, int NumItems, ref System.Array ServerHandles, out System.Array Values, out System.Array Errors, out object Qualities, out object TimeStamps);
Running this code gives me the error in the title, Value Does not fall within the expected range. Any ideas of what i might be doing wrong here?
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This is the fixed code:
public partial class FrmPartialMain : Form
{
RsiOPCAuto.OPCServer oOpcServer;
RsiOPCAuto.OPCGroup oOpcGroup;
int ClHandle; //this is set to 1 in another part of the code.
int SvHandle;
int OpcDsCashe = 1;
int OpcDsDevice = 2;
private void cmdSyncRead_Click(object sender, EventArgs e) //Sync Read
{
int lNumItems = oOpcGroup.OPCItems.Count;
int[] arH = new int[1 + lNumItems];
Array arValues = new object[1 + lNumItems]; //<-- This needed to be an object array.
Array arHandles;
Array arErrors;
object Qualities;
object Timestamps;
arH[ClHandle] = oOpcGroup.OPCItems.Item(ClHandle).ServerHandle;
arHandles = (Array)arH;
oOpcGroup.SyncRead((short)OpcDsDevice, lNumItems, ref arHandles, out arValues, out arErrors, out Qualities, out Timestamps);
txtSubValue.Text = Convert.ToString(arValues.GetValue(1));
}
}
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