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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 write to tags in C# by consuming the OPC Web Client Web Service.
 Writing to a Single Tag:
string strPCName = "";
string strOPCServer = "OPCLabs.KitServer.2";
string strTag = "Simulation.Register_I4";
int iValue = 10;
try
{
//'create the opc web client object
OPCLabs.EasyOPCDANet.EasyDAWS objOWC = new OPCLabs.EasyOPCDANet.EasyDAWS();
//make the call to write the value
objOWC.WriteItemValue
(
strPCName,
strOPCServer,
strTag,
iValue,
null,
null,
null
);
//display a message
MessageBox.Show("Wrote value!");
//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());
}
Writing to Multiple Tags within a single transaction:
try
{
//define our initial variables and set their values
object oPC = "127.0.0.1";
object oOPC = "OPCLabs.KitServer.2";
object oTags = new object[]{"Simulation.Register_I4", "Simulation.Register_R4"};
object oAccess = System.Runtime.InteropServices.VarEnum.VT_ERROR;
object oDTypes = System.Runtime.InteropServices.VarEnum.VT_ERROR;
object oModes = System.Runtime.InteropServices.VarEnum.VT_ERROR;
//'create the opc web client object
OPCLabs.EasyOPCDANet.EasyDAWS o = new OPCLabs.EasyOPCDANet.EasyDAWS();
//make the call to read multiple tags
object values = (object)o.WriteMultipleItemValues(
oPC,
oOPC,
oTags,
new object[]{10, 20},
null,
null,
null);
//string needed to generate output message
System.Text.StringBuilder sb = new System.Text.StringBuilder();
//create an array so we can iterate thru it
Array ar = (Array)values;
//iterate thru array
for(int i = 0; i < ar.GetLength(0); i++)
{
//build-up our string message
sb.Append(ar.GetValue(i) + "\n");
}
//display the message output to screen
MessageBox.Show(sb.ToString());
}
catch(Exception ex)
{
MessageBox.Show("Err: " + ex.Message.ToString());
}
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