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    This is the community forum for my apps Pythonista and Editorial.

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    How to access VisionKit?

    Pythonista
    help needed objcutil
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    • JonB
      JonB last edited by

      This post is deleted!
      1 Reply Last reply Reply Quote 0
      • JonB
        JonB @cvp last edited by

        @cvp perhaps you need to dismiss the _controller?

        cvp 1 Reply Last reply Reply Quote 0
        • cvp
          cvp @JonB last edited by

          @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)
          
          1 Reply Last reply Reply Quote 0
          • JonB
            JonB @cvp last edited by 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?

            1 Reply Last reply Reply Quote 1
            • cvp
              cvp last edited by

              scan returns an UIImage

              	print(scan.imageOfPageAtIndex_(0)) 
              
              1 Reply Last reply Reply Quote 0
              • cvp
                cvp @JonB last edited by

                @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.😢😪

                1 Reply Last reply Reply Quote 0
                • cvp
                  cvp @emkay_online last edited by

                  @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()
                  
                  1 Reply Last reply Reply Quote 0
                  • cvp
                    cvp @emkay_online last edited by

                    @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 emkay_online 2 Replies Last reply Reply Quote 0
                    • mikael
                      mikael @cvp last edited by

                      @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 1 Reply Last reply Reply Quote 0
                      • cvp
                        cvp @mikael last edited by

                        @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.

                        1 Reply Last reply Reply Quote 0
                        • JonB
                          JonB last edited by

                          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.

                          1 Reply Last reply Reply Quote 0
                          • cvp
                            cvp last edited by

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

                            pil_image.save('File.pdf',"PDF",resolution=100.0) 
                            
                            stephen JonB 2 Replies Last reply Reply Quote 0
                            • stephen
                              stephen @cvp last edited by

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

                              1 Reply Last reply Reply Quote 0
                              • JonB
                                JonB @cvp last edited by

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

                                mikael cvp 2 Replies Last reply Reply Quote 0
                                • mikael
                                  mikael @JonB last edited by

                                  @JonB said:

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

                                  Which I guess would make it slow in a way that this type of use case does not reslly tolerate.

                                  Playing with the idea of a truly personalized doc scanner that would put the scan whete it needs to go. Also, combining this with the text recognition stuff would be good (as soon as they get international characters right).

                                  1 Reply Last reply Reply Quote 0
                                  • JonB
                                    JonB last edited by

                                    But the built in objc methods for writing to PDF (see link above) ought to be reasonably fast. I haven't tried.

                                    cvp 2 Replies Last reply Reply Quote 0
                                    • cvp
                                      cvp @JonB last edited by

                                      @JonB said:

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

                                      I don't think it does multi pages, but easy to do it yourself via PdfFileMerger.
                                      Yes for ui2pil

                                      1 Reply Last reply Reply Quote 0
                                      • cvp
                                        cvp @JonB last edited by

                                        @JonB said:

                                        But the built in objc methods for writing to PDF (see link above) ought to be reasonably fast. I haven't tried

                                        I have already done the inverse (PDF -> image) via Objectivec context.. quick 🙄

                                        1 Reply Last reply Reply Quote 0
                                        • emkay_online
                                          emkay_online @cvp last edited by

                                          @cvp Thank you so much for this code. It works a treat and really gives me a solid foundation to build on.

                                          Also thank you for giving me a good grounding in the objc_util module - it's certainly a complex one, especially for someone with no iOS coding experience.

                                          Thank you.

                                          cvp 1 Reply Last reply Reply Quote 0
                                          • cvp
                                            cvp @emkay_online last edited by

                                            @emkay_online you should dismiss the viewcontroller in the didcancel delegate, not in the didfinish like I did for testing only. This if you want to process multiple scans

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