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http://codecenter.softwaretoolbox.com
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Back to Services Source Example
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Using the OPCData.NET Components within a C# NT Service Application
The following example shows you one possible way in which you could use the OPCData.NET Components within an NT Service application.
This example is not for all developers as NT Service development is not easy. Therefore this and other NT Service based examples should only be used by experienced NT Service programmers.
 Writing to a 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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