Please use our Code Center to obtain source-code and example projects/solutions:

http://codecenter.softwaretoolbox.com

Back to Services Source Examples Writing to Tags in an NT Service application using OPC Web Client Web Service Writing Single Tags 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 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()); }

Copyright Software Toolbox, Inc., 1996-2004, All Rights Reserved Worldwide.
148A East Charles Street, Matthews, North Carolina, USA 28105
Phone: 704-849-2773 or 1-888-665-3678 (US), Fax: 704-849-6388
sales@softwaretoolbox.com | support@softwaretoolbox.com