How to access VisionKit?

cvp

@mikael @JonB strange, on my iPad mini 4, three different prints and their results

	print('VNDocumentCameraViewController.isSupported')
	print(VNDocumentCameraViewController.isSupported)
	print()
	print('dir(VNDocumentCameraViewController.isSupported)')
	print(dir(VNDocumentCameraViewController.isSupported))
	print()
	print('VNDocumentCameraViewController.isSupported()')
	print(VNDocumentCameraViewController.isSupported())
'''
VNDocumentCameraViewController.isSupported
<objc_util.ObjCInstanceMethodProxy object at 0x113ca84e0>

dir(VNDocumentCameraViewController.isSupported)
['__call__', '__class__', '__delattr__', '__dict__', '__dir__', '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', '__gt__', '__hash__', '__init__', '__init_subclass__', '__le__', '__lt__', '__module__', '__ne__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__', '__weakref__', 'method_cache', 'name', 'obj']

VNDocumentCameraViewController.isSupported()
Traceback (most recent call last):
  File "_ctypes/callbacks.c", line 234, in 'calling callback function'
  File "/var/containers/Bundle/Application/34BAEE1A-BC33-4D6F-A0C1-B733E4991F31/Pythonista3.app/Frameworks/Py3Kit.framework/pylib/site-packages/objc_util.py", line 1066, in OMMainThreadDispatcher_invoke_imp
    retval = func(*args, **kwargs)
  File "/private/var/mobile/Containers/Shared/AppGroup/668A7D98-7216-47ED-917D-AA0B6173167E/Pythonista3/Documents/VNDocumentCameraViewController.py", line 37, in main
    print(VNDocumentCameraViewController.isSupported())
  File "/var/containers/Bundle/Application/34BAEE1A-BC33-4D6F-A0C1-B733E4991F31/Pythonista3.app/Frameworks/Py3Kit.framework/pylib/site-packages/objc_util.py", line 798, in __call__
    method_name, kwarg_order = resolve_instance_method(obj, self.name, args, kwargs)
  File "/var/containers/Bundle/Application/34BAEE1A-BC33-4D6F-A0C1-B733E4991F31/Pythonista3.app/Frameworks/Py3Kit.framework/pylib/site-packages/objc_util.py", line 405, in resolve_instance_method
    raise AttributeError('No method found for %s' % (name,))
AttributeError: No method found for isSupported
'''

cvp

@mikael @jonb class without alloc and init returns True

	VNDocumentCameraViewController = ObjCClass('VNDocumentCameraViewController')#.alloc().init()
	print('VNDocumentCameraViewController.isSupported()')
	print(VNDocumentCameraViewController.isSupported())

JonB

I bet the function name is wrong, or the arguments are wrong.

Shouldn't it be
documentCameraViewController_didFinishWithScan_?

You could also swizzle respondsToSelector on your delegate, and log what gets queried.
Have you checked what the protocol

cvp

@JonB doc gives this name and we are not alone with this problem, see here

cvp

@JonB said:

documentCameraViewController_didFinishWithScan_

You're right. I sincerely don't understand how I could do so big mistake.
Thanks, I'll try

Édit: save button does not close the view

cvp

The delegate is called but the view is not closed as I though thus I have proven by writing in a file. And restart Pythonista because I could not close the view.

def documentCameraViewController_didFinishWithScan_(_self, _cmd, _controller, _scan):
	with open('a.txt',mode='wt') as fil:
		fil.write('documentCameraViewController_didFinishWithScan_')
	print('documentCameraViewController_didFinishWithScan_')
	VNDocumentViewController = ObjCInstance(_controller)
	scan = ObjCInstance(_scan)	# VNDocumentCameraScan
	#print(scan) 
.
.
.

methods = [documentCameraViewController_didFinishWithScan_, documentCameraViewController_didFailWithError_, documentCameraViewControllerDidCancel_]

JonB

This post is deleted!

JonB

@cvp perhaps you need to dismiss the _controller?

cvp

@JonB I was busy to post this

def documentCameraViewController_didFinishWithScan_(_self, _cmd, _controller, _scan):
	VNDocumentViewController = ObjCInstance(_controller)
	scan = ObjCInstance(_scan)	# VNDocumentCameraScan
	#print(scan)
	VNDocumentViewController.dismissViewControllerAnimated_completion_(True, None)

JonB

@cvp re: getting the name wrong, in Swift, they omit the "nouns", i think. So the docs show the selectors without nouns. In objc_util it lets you do this too, if you use kwargs.

Re: dismissing... So did that work? If not, maybe need to on_main_thread it?

cvp

scan returns an UIImage

	print(scan.imageOfPageAtIndex_(0))

cvp

@JonB said:

documentCameraViewController_didFinishWithScan_

One more time, thanks for your help.

I really become too old for this stuff. Shame on me, I'm so sad to have not seen that myself.
Sorry to all people who tried to help us.😢😪

cvp

@emkay_online quick an dirty to see the UIImage

	import ctypes
	from PIL import Image
	UIImage = scan.imageOfPageAtIndex_(0)	
	# Save UIImage to jpg file
	func = c.UIImageJPEGRepresentation
	func.argtypes = [ctypes.c_void_p, ctypes.c_float]
	func.restype = ctypes.c_void_p
	x = ObjCInstance(func(UIImage.ptr, 1.0))
	x.writeToFile_atomically_('test.jpg', True)
	# Display jpg file
	image = Image.open("test.jpg")
	image.show()

cvp

@emkay_online operational

from objc_util import *
import ui
load_framework('VisionKit')

def documentCameraViewController_didFinishWithScan_(_self, _cmd, _controller, _scan):
	VNDocumentViewController = ObjCInstance(_controller)
	scan = ObjCInstance(_scan)	# VNDocumentCameraSca
	
	UIImage = scan.imageOfPageAtIndex_(0)	
	ObjCInstance(VNDocumentViewController.ui_view['iv']).setImage_(UIImage)

	VNDocumentViewController.dismissViewControllerAnimated_completion_(True, None)
	
def documentCameraViewController_didFailWithError_(_self, _cmd, _controller, _error):
	print('documentCameraViewController_didFailWithError_')
	
def documentCameraViewControllerDidCancel_(_self, _cmd, _controller):
	print('documentCameraViewControllerDidCancel_')

methods = [documentCameraViewController_didFinishWithScan_, documentCameraViewController_didFailWithError_, documentCameraViewControllerDidCancel_]
protocols = ['VNDocumentCameraViewControllerDelegate']
try:
		MyVNDocumentCameraViewControllerDelegate = ObjCClass('MyVNDocumentCameraViewControllerDelegate')
except:
	MyVNDocumentCameraViewControllerDelegate = create_objc_class('MyVNDocumentCameraViewControllerDelegate', methods=methods, protocols=protocols)

@on_main_thread	
def main():
	VNDocumentCameraViewController = ObjCClass('VNDocumentCameraViewController').alloc().init()
	delegate = MyVNDocumentCameraViewControllerDelegate.alloc().init()
	VNDocumentCameraViewController.delegate = delegate	

	uiview = ui.View()
	iv = ui.ImageView(name='iv')
	iv.frame = uiview.bounds
	iv.flex = 'wh'
	uiview.add_subview(iv)
	uiview.present('fullscreen')
	VNDocumentCameraViewController.ui_view = uiview	# to pass to delegate
	
	objc_uiview = ObjCInstance(uiview)
	SUIViewController = ObjCClass('SUIViewController')
	vc = SUIViewController.viewControllerForView_(objc_uiview)	
	vc.presentViewController_animated_completion_(VNDocumentCameraViewController, True, None)
	
main()

mikael

@cvp, good stuff. It gives the straightened-out picture, right? Can I get a multi-page PDF, or is the framework for single pictures only?

cvp

@mikael no,no, the framework is for multiple scans but my little script not.
I think that if you don't dismiss the camera view controller, you could continue to scan multiple images, but I did not test it.

JonB

i think the document object guves you UIImages only, but you could create a pdf using some UIKit functions:

https://developer.apple.com/documentation/uikit/images_and_pdf?language=objc

(you need to acces the functions using c.UIGraphicsBeginPDFContextToFile etc and set argtypes and restype)

I think the basic flow is, you have to create a pdf context to a file, begn a pdf page, draw your content (UiImage's drawAtPoint ), begn a new page, etc, then finally end the context.

cvp

Do you know that PIL save has an option to save as pdf?

pil_image.save('File.pdf',"PDF",resolution=100.0)

stephen

@cvp this would of been wonderfull information about 3 months go lol

JonB

@cvp can PIL do multipage PDF? I guess you still would need to do the ui2pil type business.