Python Create Byte Array for Web Service Expecting Byte[]

Question

I'm using a SOAP based web service that expects an image element in the form of a 'ByteArray' described in their docs as being of type 'byte[]' - the client I am using is the Python based suds library.

Problem is that I am not exactly sure how to represent the ByteArray in for this service - I presume that it should look something like the following list:

[71,73,70,56,57,97,1,0,1,0,128,0,0,255,255,255,0,0,0,33,249,4,0,0,0,0,0,44,0,0,0,0,1,0,1,0,0,2,2,68,1,0,59]

Now when I send this as part of the request, the service complains with the message: Base64 sequence length (105) not valid. Must be a multiple of 4. Does this mean that I would have to pad each member with zeroes to make them 4 long, i.e. [0071,0073,0070,...]?

Raz · Accepted Answer · 2010-07-23 11:26:56Z

2

I got it figured in the end - what the web service meant by a ByteArray (byte[]) looked something like:

/9j/4AAQSkZJRgABAgEAYABgAAD/7gAOQWRvYmUAZAAAAAAB...

... aha, base 64 (not anywhere in their docs, I hasten to add)...

so I managed to get it working by using this:

encoded_data = base64.b64encode(open(file_name, 'rb').read())
strg = ''
for i in xrange((len(encoded_data)/40)+1):
    strg += encoded_data[i*40:(i+1)*40]
# strg then contains data required

I found the inspiration right here - thanks to Doug Hellman

edited Jul 23, 2010 at 11:26

answered Jul 23, 2010 at 9:47

Raz

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1 Comment

igniteflow Over a year ago

Thank you for posting your solution, this is exactly what I was looking for

Katriel · Accepted Answer · 2010-07-22 14:28:36Z

0

Try a bytearray.

answered Jul 22, 2010 at 14:28

Katriel

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