Log In
Register
Forum
Topic RSS
14:44, EET
August 20, 2014
Offline
Hi,
we want to write Data from a Ua Client (Java SDK) to any Node of a Ua Server. What is the best way to handle the dataTypes from Java to OPCUA? I read about the DataTypeConverter and have tried it out. I Tried the method: getDataTypeForJavaClass(). This worked for primitive types like int, double, float etc. But it’s not working for arrays. How should i handle a java array, which i want to write to an array variable in the UaServer?
Thanks
Best Regards
Ibrahim
15:57, EET
April 17, 2013
Offline
Hello,
How about finding out the data type of components in the array and then using the DataTypeConverter? See this link for details: http://download.oracle.com/jav…..Type%28%29
16:45, EET
April 17, 2013
Offline
Actually, the getDataTypeForJavaClass() method should work also with array types. Can you provide some code example of data type conversion not working?
Also, the convert-methods in DataTypeConverter might be what you are looking for.
17:57, EET
August 20, 2014
Offline
Hi,
this is a sample from our code, which does not work:
double[] dArray = new double[2];
dArray[0] = 3.6;
dArray[1] = 5.7;
DataTypeConverter converter = client.getAddressSpace().getDataTypeConverter();
UaDataType dataTypeValue = converter.getDataTypeForJavaClass(dArray.getClass());
The method getDataTypeForJavaClass() throws: java.lang.IllegalArgumentException: Cannot find data type of double
10:42, EET
April 17, 2013
Offline
Hi,
In this case, the issue isn’t related to arrays. Instead, the problem is that primitive type double is used. Primitive types do not work, because they aren’t Objects.
Try changing the array to Double[], the code should be fine otherwise.
12:24, EET
August 20, 2014
Offline
Hi,
thanks.
Does it mean, that i cannot write primitive Java arrays to a UA Server Node?
13:04, EET
April 17, 2013
Offline
Yes. Primitive types cannot be used, just use the wrapper classes.
15:32, EET
August 20, 2014
Offline
Hi,
i found a way to make it work with primitive types:
double[] dArray = new double[2];
dArray[0] = 3.6;
dArray[1] = 5.7;
Double[] d = ArrayUtils.toObject(dArray);
client.writeValue(nodeId, d);
This works fine. I don’t know how performant this is, but it works and it is just for very few cases.
Thanks anyway.. 
Ibrahim
Most Users Ever Online: 1919
Currently Online:
24 Guest(s)
Currently Browsing this Page:
1 Guest(s)
Top Posters:
Heikki Tahvanainen: 402
hbrackel: 144
rocket science: 90
pramanj: 86
Francesco Zambon: 83
Ibrahim: 78
Sabari: 62
kapsl: 57
gjevremovic: 49
Xavier: 43
Member Stats:
Guest Posters: 0
Members: 810
Moderators: 7
Admins: 1
Forum Stats:
Groups: 3
Forums: 15
Topics: 1541
Posts: 6504
Newest Members:
Henrybal, vincent.lin1970@gmail.com, JamesLiabe, DanielMaype, RobertPrire, VirCibre, semunah, StevenMot, elinorbalke7872, CharlesGUirmModerators: Jouni Aro: 1029, Pyry: 1, Petri: 0, Bjarne Boström: 1040, Jimmy Ni: 26, Matti Siponen: 353, Lusetti: 0
Administrators: admin: 1
