Writing subarray (Based on example addMatrixVariable)

[Torben Blanken]

Hello,

while testing some base-functionallity, I'm trying to write some values to a sub array, but allways get the error "BadIndexRangeNoData".

Serverside-Variable-Node exists (details see https://open62541.org/doc/current/tutorial_server_variable.html):

UA_UInt32 arrayDims[2] = {2,2};
UA_Double zero[4] = {0.0, 0.0, 0.0, 0.0};

Writing complete array using "UA_Client_Service_write" is correctly executed - no problem.

No I try just to write the seconde subarray (index 1):

UA_StatusCode retval;

UA_UInt32 nodeValueDimension[1] = {2};

UA_Double myValue[2] = {99.0, 100.0 };

UA_Variant myVariantValue;

UA_Variant_init(&myVariantValue);

retval = UA_Variant_setArrayCopy(&myVariantValue, &myValue, 2, &UA_TYPES[UA_TYPES_DOUBLE]);

UA_WriteValue wValue;

UA_WriteValue_init(&wValue);

wValue.nodeId = UA_NODEID_STRING(1, (char*)"the.matrix"); // node to write to

wValue.attributeId = UA_ATTRIBUTEID_VALUE;

wValue.value.value = myVariantValue;

wValue.value.hasValue = true;

wValue.indexRange = UA_STRING((char*)"1");

UA_WriteRequest wReq;

UA_WriteRequest_init(&wReq);

wReq.nodesToWrite = &wValue;

wReq.nodesToWriteSize = 1;

UA_WriteResponse wResponse = UA_Client_Service_write(client, wReq);

retval = *wResponse.results;

My expected result / my intention would be something like

{0.0, 0.0, 99.0, 100.0}

Does someone know or can give me a hint on my problem?

Best regards,

Torben

[Julius Pfrommer]

The IndexRange is just "1".

Probably you meant "1,0:1" to select a "block" within the 2x2 matrix.

Also, the dimension of the value you write needs to match the dimension of the selected "block".

See here for an example:

https://github.com/open62541/open62541/blob/master/tests/server/check_services_attributes.c#L801

Regards,

Julius