added a demo for the features introduced in the last commit, using an…

… OPC access component

demo/opcdata/opc.lua

@@ -0,0 +1,23 @@
+
+require "luacom"
+
+opc = luacom.CreateObject("OPCDataCtrl.OPCDataCtrl.1")
+assert(opc)
+
+opc:setOPCServer("Matrikon.OPC.Simulation.1")
+
+print(opc.OPCServer)
+assert(opc:Connect())
+
+print(opc:ReadVariable("Random.Int2"))
+print(opc:ReadVariable("Random.Int2"))
+print(opc:ReadVariable("Random.Int2"))
+code, t1, t2 = opc:ReadMultiVariables({ Type = "array of string", Value = { "Random.Int2", "Square Waves.Real8" } })
+print(code)
+for k, v in pairs(t1) do
+  print(k, v)
+end
+for k, v in pairs(t2) do
+  print(k, v)
+end
+