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encoding and decoding multilevel arrays
Posted: Wed Oct 30, 2019 12:17 pm
by danielrr
Hi all
I seem to be unable to arrayDecode an array containing more than two "levels"
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put "one" into arrayBibliografia[1]
put "foo" into arrayBibliografia[1]["one"]
put "two" into arrayBibliografia[2]
put "three" into arrayBibliografia[3]
put "binfile:test" into nfile
open file nfile for write
get the result
if the result <> "" then errorFin "error al crear un archivo " & it. --it's ok up to this point, Daniel
write arrayEncode(arrayBibliografia,"7.1") to file nfile
close file nfile
get the result
if the result <> "" then errorFin "error al crear un archivo " & it
open file nfile
read from file nfile until eof
close file nfile
put arrayDecode(it) into arrayResult
At the end of this code, the output is puzzling. The contents of "one" in arrayResult is not "foo". Instead, contents of "1" and "3" are empty and content of "2" is "1869505798" (
)
The problem is worst if the array contains unicode chars. In that case the result can be erratic (as in the example above) of the arrayDecode function may not work at all
Re: encoding and decoding multilevel arrays
Posted: Wed Oct 30, 2019 1:25 pm
by [-hh]
Re: encoding and decoding multilevel arrays
Posted: Wed Oct 30, 2019 2:59 pm
by danielrr
Thanks. Does it mean that there's no solution to the problem but to convert the array into a variable using a repertoire of delimiters before saving it to a file, and then turn again the variable into an array using the same repertoire of delimiters?
Re: encoding and decoding multilevel arrays
Posted: Wed Oct 30, 2019 3:35 pm
by [-hh]
With a second read I noticed that you only wish to decode/encode the array, not flatten it, sorry.
Your problem may be the incomplete binary write/read. So you could try, which is moreover 'simpler':
write:
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put arrayEncode(arrayBibliografia,"7.1") into url ("binfile:"&stackFolder()&"test.data")
read:
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put arrayDecode(url ("binfile:"&stackFolder()&"test.data")) into dd
This works here (e.g. dd[1]["one"] is "foo").
__________________________________
I used also
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function stackFolder
put the effective filename of this stack into f
set itemdelimiter to slash; put empty into last item of f
return f
end stackFolder
Re: encoding and decoding multilevel arrays
Posted: Wed Oct 30, 2019 4:05 pm
by FourthWorld
The output of arrayEncode is binary. The key to reading/writing those files is to use binary mode, e.g.:
Code: Select all
open file "whatever.lson" for binary write
...or the "binfile" option for the "put URL..." syntax as hh showed.
LSON files (LiveCode encoded arrays) are wonderfully robust and efficient, a good choice for many storage needs.
Re: encoding and decoding multilevel arrays
Posted: Wed Oct 30, 2019 5:04 pm
by danielrr
Works flawlessly, even with Unicode strings, thanks -hh, FourthWorld
