Return the value of a string attribute.
These are the parameters that this method requires:
|instance||Pointer to the instance this method call is intended for|
|attr||Attribute to return value of (defined in VP.h)|
|value||Returns a pointer to the string|
This method returns a return code integer, which indicates whether the call was successful or errored for any reason:
||Successful call (for methods that have a registered callback, it only means the request has been sent)|
If unsuccessful, then pointer is not set.
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