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Please use our Code Center to obtain source-code and example projects/solutions:
http://codecenter.softwaretoolbox.com
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 Web Service Consumption
The following example shows you how to read/write to tags of type Array in C# by consuming the OPC Web Client Web Service.
 Reading an Array Tag:
string strPCName = "";
string strOPCServer = "SWToolbox.TOPServer";
string strTag = "Channel_1.Device_1.TagArray_1";
try
{
//define our OPC Web Client objects
OPCLabs.EasyOPCDANet.EasyDAWS objOWC = new OPCLabs.EasyOPCDANet.EasyDAWS();
OPCLabs.EasyOPCDANet.IVTQNet objTagVTQ;
//read the tag
objTagVTQ = objOWC.ReadItem
(
strPCName,
strOPCServer,
strTag,
null,
null,
null);
//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(System.Web.Services.Protocols.SoapException webex)
{
MessageBox.Show("Error: " + webex.Message.ToString());
}
catch(Exception ex)
{
MessageBox.Show("Error: " + ex.Message.ToString());
}
Writing to an Array Tag:
string strPCName = "";
string strOPCServer = "SWToolbox.TOPServer";
string strTag = "Channel_1.Device_1.TagArray_1";
try
{
//
//create our array of values we want to write to the tag
int[] values = new int[]{0, 1, 2, 4, 5, 6, 7, 8, 9, 10};
//
//define our OPC Web Client objects
OPCLabs.EasyOPCDANet.EasyDAWS objOWC = new OPCLabs.EasyOPCDANet.EasyDAWS();
//
//now to do the write
objOWC.WriteItemValue
(
strPCName,
strOPCServer,
strTag,
values,
null,
null,
null
);
//
//display a message
MessageBox.Show("Tag write a success!");
//
//clean-up
objOWC = null;
}
catch(System.Web.Services.Protocols.SoapException webex)
{
MessageBox.Show("Error: " + webex.Message.ToString());
}
catch(Exception ex)
{
MessageBox.Show("Error: " + ex.Message.ToString());
}
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