[Glass] Files and UTF8 but not using String #encodeAsUTF8

Mariano Martinez Peck via Glass glass at lists.gemtalksystems.com
Thu Feb 26 07:03:59 PST 2015

Hi guys,

I am trying to implement the solution provided by Dale for exporting and
importing large objects with SIXX: https://github.com/glassdb/SIXX?files=1

In his example he does:

 strm := WriteStream on: String new.
 #( 1 2 3) sixxOn: strm persistentRoot: (UserGlobals at:

That stream 'strm' is in memory. I need files. And I want those files to be
encoded with UTF8. In addition, in my experience, I have been trying to use
GsFile as much as possible since it was way faster than other classes when
I tested it. So...so far I was using the following approach to write a UTF8

file := GsFile openWrite: aFilename.
file nextPutAll: aString encodeAsUTF8.

However, I cannot use that approach in the SIXX scenario. Why? Because I
cannot easily hook in the parts where sixx gets the string of an object and
writes it to the stream. So I kind of need to create the File stream with
UTF8 from the beginning.

I do have UT8TextConverter, but GsFile dnu #converter:. I tried:

| stream |
*stream := MultiByteBinaryOrTextStream on: (GsFile openWrite: aFilename).*
* stream converter: UTF8TextConverter new. *
* stream text. *
  MCPlatformSupport commitOnAlmostOutOfMemoryDuring: [
    UserGlobals at: #'MY_SIXX_ROOT_ARRAY' put: Array new.
        #( 1 2 3) sixxOn: stream persistentRoot: (UserGlobals at:
  stream close.

But it doesn't work. Ok..I did see GsFile >> contentsAsUtf8   so I could
write all the file first, then grab the contents as UT8 and then do what I
did above (a new file doing #nextPutAll: of the UTF8). But...since I am
doing all this code because the object graph I am trying to serialize is
big I am afraid I will run out of memory while trying to have all the
contents as UTF8. So I would really like the "streaming" possibility.

Any ideas how can I do that?


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