On Fri, 7 Dec 2012, Reimar Grabowski wrote:
Hi,
I have a relatively simple JSON object consisting of some integer and
string fields and a large (500-500000 entries) float array. Following the
parsedemo.pp I extract the values from JSON and put them in my pascal
class. All works as expected only that I do not seem to find a method to
copy the complete float array from the TJSONArray object to an array of
double in one go. I can do it manually by traversing the array but
wouldn't it be more convenient to have this functionality in TJSONArray
(same for string, integer and other arrays). Am I missing something?
No.
The reason I did not implement this is 2-fold:
1. Because there is no guarantee that the array contains only floats, a JSON
array is an array of elements.
These elements can be of any type.
2. The implementation of such a routine would do the same as you:
manually traverse the array. So it would not bemore efficient.
Of course, it could be convenient.
On another note. There is no automatic way to create an instance of a custom
class from a TJSONObject or is there?
JSON: {"fooStr":"foobar","fooInt":700,"fooFloatArray":[1.1, 1.2, 1.3]}
Pascal:
TMyCustomClass = class
fooStr: String;
fooInt: Integer;
fooFloatArray: array of double;
end;
Thanks for any info on this matter.
There currently is not.
For the same reason as 1. above the last element fooFloatArray, is hard to generate.
But I think it is in general a good idea to have such a mechanism, it would help in
many cases.
Michael.
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