Avatar

Please consider registering
guest

sp_LogInOut Log In sp_Registration Register

Register | Lost password?
Advanced Search

— Forum Scope —




— Match —





— Forum Options —





Minimum search word length is 3 characters - maximum search word length is 84 characters

sp_Feed Topic RSS sp_TopicIcon
Read VariableValues of different ValueTypes
April 27, 2015
8:31, EEST
Avatar
alex_seel
New Member
Members
Forum Posts: 1
Member Since:
April 27, 2015
sp_UserOfflineSmall Offline

Hello support team,

i am evaluating the Java OPC UA SDK. For our case we need to extract data (value attribute) from different variableNodes . Only solution i can think of is following:

DataValue data=client.readValue

if(data.getValue() instanceof Range){
Range range_=(Range)data.getValue();
Double high=range_.getHigh();
Double low=range_.getLow();
/*action with high + low*/
}

if(data.getValue() instanceof EUInformation){
EUInformation euinfo_=(EUInformation)data.getValue();
Integer Unitid=euinfo.getUnitid();
/*get other data from euinfo*/
/*action with extracted data from euinfo*/
}

if(…){
….
}
….
Is there some better way to get data from variant? I am also aware of safe cast via variant.asClass(). But it would also lead to much if-statements.
Could you kindly provide examples if there way around if()s.
Thanks in advance.

April 28, 2015
10:01, EEST
Avatar
Jouni Aro
Moderator
Moderators
Forum Posts: 1010
Member Since:
December 21, 2011
sp_UserOfflineSmall Offline

Yes, unfortunately the usage of Variants is a bit cumbersome and this is the best way to do it.

Forum Timezone: Europe/Helsinki

Most Users Ever Online: 518

Currently Online:
15 Guest(s)

Currently Browsing this Page:
1 Guest(s)

Top Posters:

hbrackel: 135

pramanj: 86

Francesco Zambon: 81

rocket science: 77

Ibrahim: 76

Sabari: 62

kapsl: 57

gjevremovic: 49

Xavier: 43

fred: 41

Member Stats:

Guest Posters: 0

Members: 683

Moderators: 16

Admins: 1

Forum Stats:

Groups: 3

Forums: 15

Topics: 1467

Posts: 6261

Newest Members:

digitechroshni, LouieWreve, Kickbiche, karrimacvitie5, graciela2073, sagarchau, elviralangwell4, Donnavek, Eddiefauth, DonaldPooma

Moderators: Jouni Aro: 1010, Otso Palonen: 32, Tuomas Hiltunen: 5, Pyry: 1, Petri: 0, Bjarne Boström: 983, Heikki Tahvanainen: 402, Jukka Asikainen: 1, moldzh08: 0, Jimmy Ni: 26, Teppo Uimonen: 21, Markus Johansson: 42, Niklas Nurminen: 0, Matti Siponen: 321, Lusetti: 0, Ari-Pekka Soikkeli: 5

Administrators: admin: 1