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This example assumes you have the TOPServer installed with the "simdemo.opf" project loaded. The following example builds upon the Tutorial - Using with C#. Simply copy & paste the code below into the form constructor:
Reading an Array-Tag Example
This tutorial uses the modified "Simdemo.opf" project.
Reading an Array-Tag:{
//
// Required for Windows Form Designer support
//
InitializeComponent();
//
// TODO: Add any constructor code after InitializeComponent call
//
string strPCName = "";
string strOPCServer = "SWToolbox.TOPServer";
string strTag = "
Channel_1.Device_1.TagArray_1";
string strAccessPath = "";
int iDataType = 0;
try
{
//
//define our OPC Web Client objects
EASYOPCDALib.EasyDA objOWC = new EASYOPCDALib.EasyDAClass();
EASYOPCDALib.VTQ objTagVTQ;
//
//read the tag
objTagVTQ = (EASYOPCDALib.VTQ)objOWC.ReadItem(strPCName,
strOPCServer, strTag, strAccessPath, iDataType);
//
//get the type of the tag value - this should indicate
//if it is an array or not
Type ty = objTagVTQ.Value.GetType();
//
//now check if it is an array
if (ty.IsArray)
{
//
//get the tag value into an array
System.Array ar;
ar = (System.Array)objTagVTQ.Value;
//
//use a stringbuilder to build our string of values so that
//we can display them on-screen easily
System.Text.StringBuilder sb = new System.Text.StringBuilder();
//
//iterate thru all objects within array
foreach(Object o in ar)
{
sb.Append(o.ToString() + " ");
}
//
//display the finished result to screen
MessageBox.Show(sb.ToString());
//
//clean-up
sb = null;
ar = null;
}
else
{
MessageBox.Show("Not an array!");
}
//
//clean-up
objTagVTQ = null;
objOWC = null;
}
catch(Exception ex)
{
MessageBox.Show("Error: " + ex.Message.ToString());
}
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