Hello,
I’m trying to browse the OPC server pull the nodes that are folders which the “system.opc.browseServer” is seeing as “OBJECTS” and then construct the necessary paths that could be used in the TREE VIEW component? I’m using recursion to do this because originally I was using a nested for-loop but I can only browse so far in the OPC server.
With recursion I can never construct the path correctly such as “root/child/child/child” and then add that path to a list?
#This code should browse the nodes in the server that are folders and start creating the directory path from the root.
#The code will then construct a dataset to be used in the tree browse component.
#format should be [root/child/child,root/child/child,........,Npath] in List
OPCServerName = "LINX-7923 Server"
#start from the root
NodeId = ""
def browseServer(nodeId):
pathList = []
children = system.opc.browseServer(OPCServerName, nodeId)
for child in children:
elementType = str(child.getElementType())#SEES FOLDERS AS TYPE OBJECTS INSTEAD OF TYPE "FOLDER"
childNodeId = str(child.getServerNodeId().getNodeId()) #Get the Node ID ex: n=1;i=x
folderName = str(child.getDisplayName())#get the string name of the node in the server
if elementType == "OBJECT": #all folders are treated as objects that's why im doing this comparing
pathList.append(folderName) #"/"+str(browseServer(childNodeId))
browseServer(childNodeId)
return pathList
PathList = browseServer(NodeId)
for path in PathList:
print path
When using recursion alot of processor power from the gateway is used, is it better to run this code on a different thread so I don’t overload the gateway such as with “system.util.invokeAsynchronous”
