Passing An Image Back To Workflow

MartinPacker

To reveal a little more of the picture...

... My idea was to create a graphing Pythonista capability so Workflow might pass a CSV (file) into Pythonista and then do something with the graph (image) returned.

In essence I wanted to add graphing to Workflow. I would expect Pythonista would be a good way to do it.

Would Editorial do this better than Pythonista?

ccc

@cvp Please check the File Storage (Ubiquity) section of the page:

You can access documents stored in your iCloud account by using the files property’s dir method

Phuket2

@MartinPacker , I am not really sure about Editorial vrs Pythonista for the graphing, they could be equivalent. But my guess would be that Pythonista would be the superset of functionality.
But just really wanted to mention the 'Pie Chart Demo.py' in the Examples/Plotting dir in Pythonista. Great demo how to easily create a pie chart with some nice features. It's so easy to understand. Then I am pretty sure if you use a ui.ImageContext to draw into you could return that image for the clipboard. Possibly the matplotlib gives a more direct way. Just interesting

cvp

@ccc
Hi
I had checked this page but they only support iCloud file storage, that will say Apple apps storage, like Notes, but not iCloud Drive storage of all other apps, what does Workflow app.
In Workflow, you can save a file to the ICloud Drive of another app, like Documents, FileBrowser, Pages, Numbers etc...

cvp

@ccc
It's exactly like you can manually do in Pythonista by

edit
select a file
share
add to ICloud Drive

But automatically

MartinPacker

All this talk about iCloud illustrates one of the reasons why I'm not looking for a "write to file" solution.

Clipboard would be fine, though "trashing" the clipboard should only be done if necessary. It seems that it is.

MartinPacker

Something for y'all to pick the bits out of...

A reply from @WorkflowHQ on Twitter contained the following...

"Also regarding sending images, Workflow can decode base64 encoded images."

Does this help us here? Can we encode images base64?

omz

@MartinPacker Encoding images as base64 should be fairly straightforward in Python. Do you have any more details?

ccc

https://forum.omz-software.com/topic/2974/need-python-script-to-decode-or-encode-in-base64

omz

I figured out how to do it without using the clipboard. The trick is basically to use "Get Contents of URL" with a data: URI that gets passed to the workflow via the workflow:// scheme, containing base64-encoded image data.

Here's the script:

import webbrowser
import base64
from PIL import Image
import io
from urllib.parse import quote

img = Image.open('test:Lenna')

buffer = io.BytesIO()
img.save(buffer, 'PNG')
data_uri = 'data:image/png;base64,' + base64.b64encode(buffer.getvalue()).decode('ascii')

webbrowser.open('workflow://run-workflow?name=EditBase64Image&input=' + quote(data_uri, ''))

...and the workflow should be something like this:

Screenshot

shtek

invalid base64 encode.
remove 'data:image/png;base64,' like this:

data_uri  = base64.b64encode(buffer.getvalue()).decode('ascii')

now it works