Valid Json code for elements of Type "Array"
Hi,
the protocol specification for array primitives is a little bit rare. Therefore I have some questions.
1.) Is the following json sample syntax in case of a UInt- or AsciiString-array also valid?
- "Elements": {
- "Name": "ERT_FD3_LF1",
- "SupportsQoSRange": 0,
- "Capabilities": {
- "Type": "Array",
- "Data": [5,6,10,11,13,18,19]
- }
- },
- "Elements": {
- "Name": "ERT_FD3_LF1",
- "SupportsQoSRange": 0,
- "Capabilities": {
- "Type": "Array",
- "Data": ["D1", "D2"]
- }
- },
2.) Could a array have a data-property with null, like following?
- "Elements": {
- "Name": "ERT_FD3_LF1",
- "SupportsQoSRange": 0,
- "Capabilities": {
- "Type": "Array",
- "Data": null
- }
- },
3.) or it should be a empty-Array like this:
- "Elements": {
- "Name": "ERT_FD3_LF1",
- "SupportsQoSRange": 0,
- "Capabilities": {
- "Type": "Array",
- "Data": [ ]
- }
- },
Best Answer
-
The syntax of an Array should be similar in a FieldEntry or ElementEntry. It doesn't support the short form.
{
"Type": "<Type>",
"Data": [<Data>]
}In a FieldEntry, an Array looks like this:
"KEYWD_LIST": {
"Type": "AsciiString",
"Data": [
"TEST1",
"TEST2"
]
}In an ElementEntry, an Array looks like this:
"Capabilities": {
"Type": "Array",
"Data": {
"Type": "UInt",
"Data": [5,6,10,11,13,18,19]
}
},The "Type": "Array" is required by an element list and the payload (an array) is specified in the "Data" property.
0
Answers
-
Thanks for reaching out to us.
I did a quick test by sending post messages to RTDS to verify how RTDS handles the array.
I used the KEYWD_LIST field entry which contains an array.
KEYWD_LIST "KEYWORD LIST" 30020 NULL NONE 0 ARRAY 0
The following arrays work.
"KEYWD_LIST": {
"Type": "AsciiString",
"Data": [
"TEST1",
"TEST2"
]
}
...
...
"KEYWD_LIST": {
"Type": "UInt",
"Data": [
1,
2
]
}
...
...
"KEYWD_LIST": {
"Type": "UInt",
"Data": []
}
...
...
"KEYWD_LIST": {
"Type": "AsciiString",
"Data": []
}The following arrays don't work.
"KEYWD_LIST": {
"Type": "AsciiString",
"Data": null
}
...
...
"KEYWD_LIST": {
"Type": "UInt",
"Data": null
}
...
...
"KEYWD_LIST": {
"Data": [1,2,3]
}
...
...
"KEYWD_LIST": {
"Data": ["TEST1","TEST2"]
}In conclusion:
- The type of data in the array is required
- null is not allowed
- [] is used for an empty array
I hope that this information is of help.
0 -
Hi,
thank your for the quick answer. I saw, you did your test using a field of a fieldlist, which is declared in the fields dictionary. So I see, that the result is far different from my expectation, because my sample based on an entry of a ElementsList wich looks originally like this.
- "Elements": {
- "Name": "ERT_FD3_LF1",
- "SupportsQoSRange": 0,
- "Capabilities": {
- "Type": "Array",
- "Data": {
- "Type": "UInt",
- "Data": [5,6,10,11,13,18,19]
- }
- },
The question now is: In both cases (Field- and Element-Entry), does the short form vor a UInt- or AsciiString-Array not need the outer Array-Object, or is this only in case of a field-entry?
0 - "Elements": {
-
Thank you.0
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