Converting iris stream to python bytes is very slow

Question

Question

I'm trying to use embedded python code that receives an Iris %Stream.GlobalBinary and uses image manipulation library PIL.

Because PIL can't work with IRIS %Stream, I need to convert the image to python bytes.

This process seems to have very bad performance compared to writing to a file and then loading it from a file in python.

Is there a better way to send a stream into python? The conversion code I'm using is below.

Thanks.

def iris_stream_to_bytes(stream):
	stream.Rewind()
	s = ""
	while not stream.AtEnd:
		r = stream.Read(1024)
		s += r
	b = bytearray()
	b.extend(map(ord, s))
	return b

Product version: IRIS 2024.2

$ZV: IRIS for Windows (x86-64) 2024.2 (Build 247U) Tue Jul 16 2024 09:57:03 EDT

Discussion (2)1

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score 0 · Answer 1 · 2024-12-18T05:00:07-05:00

I'm using it all the time for string and i haven't seen any performance issue so far.

May be try to increase the buffer :

def stream_to_string(stream,buffer=1000000)-> str:
    string = ""
    stream.Rewind()
    while not stream.AtEnd:
        string += stream.Read(buffer)
    return string

score 0 · Answer 2 · 2024-12-18T05:38:06-05:00

ClassMethod Stream2BytesArray(stream As %Stream.Object) As %SYS.Python
{
set builtin = $SYSTEM.Python.Builtins()

set b = builtin.bytearray()

  do stream.Rewind()
  while 'stream.AtEnd {
    set r = $system.Python.Bytes(stream.Read($$$MaxLocalLength))
    do b.extend(r)
  }
  quit b
}