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#Post#: 1656--------------------------------------------------
Duplicate keys
By: Nick_W Date: January 21, 2017, 7:23 pm
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I'm just getting ready to release my new LIS2DH12 library (which
actually works), and I'm writing some example programs.
One thing I ran into, was putting a line like this into the
accelerometer ISR
[code]
JData.add("Orientation", Orientation)
[/code]
Where jData is a json object, and Orientation is a string giving
the Orientation "up" "down" etc. The json is published ever 10
seconds by a shared event.
The json object is a shared variable, and is cleared after it is
published.
I thought that as the orientation was changed, the new
orientation would overwrite the old, and when published you
would have the orientation at the point it was published.
Instead, I get a run time error, saying that the publish string
is too long. Looking at the culprit (jData) it has dozens of
entries (I couldn't tell what the entries were, the Debugger
shows (" for the content, but the Count() was 120 in one
instance.
This seems to imply that duplicate pairs are allowed in a json
object (and the standard does not disallow this).
Is this the case? Is this the intended operation of your
implementation of the json object?
It's an easy fix (just clear before adding the new value), but I
was wondering if this was intended or not, as most json
implementations do not allow duplicate keys.
I also ran this through slowly, to see how duplicate keys
deserialize to strings, and lo! No duplicate keys in the string.
But the count says there is. Not sure exactly what is going on.
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