Cannot access a StringStream Datastring from Web Core

[Julio_R_Ferrari (Julio Ferrari)]

Hi.

I'm trying to save data from FNCGrid in Web Core. I can write it to a TStringStream, access its size, position, etc., but everytime I access DataString property, I get:

 classes.pas:1902 
 Uncaught RangeError: byte length of Uint16Array should be a multiple of 2
    at new Uint16Array (<anonymous>)
    at Object.GetDataString (classes.pas:1902:26)
    at Object.WebButton1Click 

var
  st : TStringStream;
begin
  st := TStringStream.Create;
  grd.SaveToCSVStream(st);

showmessage(st.Size.ToString); Ok
showmessage(st.Position.ToString); Ok
showmessage(st.DataString.Length.ToString); Error

I would use this DataString with a TWebLocalTextFile to save grid content locally, but I can't access DataString.

[Julio_R_Ferrari (Julio Ferrari)]

I've been applying filters. Depending on the size of the resulting stream, I'm able to access DataString without errors.

But that's not just a case of "shorter - no error, larger - error".

Different sizes lead to distinct results. Seems like it depends on the number of bits or bytes needed to compose the size value.

[Ferrari_Julio]

It was an encoding issue.

This solved everything:

  st := TStringStream.Create('', TEncoding.utf8);
  grd.SaveToCSVStream(st, TEncoding.utf8);