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14:44, EET
August 20, 2014
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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
Moderators
April 17, 2013
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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
Moderators
April 17, 2013
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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
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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
Moderators
April 17, 2013
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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
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Hi,
thanks.
Does it mean, that i cannot write primitive Java arrays to a UA Server Node?
13:04, EET
Moderators
April 17, 2013
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Yes. Primitive types cannot be used, just use the wrapper classes.
15:32, EET
August 20, 2014
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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
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