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How to access VisionKit?
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@cvp this would of been wonderfull information about 3 months go lol
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@cvp can PIL do multipage PDF? I guess you still would need to do the ui2pil type business.
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@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).
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But the built in objc methods for writing to PDF (see link above) ought to be reasonably fast. I haven't tried.
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@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 -
@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 π
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@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.
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@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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@JonB said:
But the built in objc methods for writing to PDF (see link above) ought to be reasonably fast. I haven't tried.
Please applaus. ok, I exaggerate π, but was not so easy (for me)
from objc_util import * import ui UIGraphicsGetCurrentContext = c.UIGraphicsGetCurrentContext UIGraphicsGetCurrentContext.restype = c_void_p UIGraphicsGetCurrentContext.argtypes = [] UIGraphicsBeginPDFContextToData = c.UIGraphicsBeginPDFContextToData UIGraphicsBeginPDFContextToData.restype = None UIGraphicsBeginPDFContextToData.argtypes = [c_void_p, CGRect, c_void_p] UIGraphicsBeginPDFPage = c.UIGraphicsBeginPDFPage UIGraphicsBeginPDFPage.restype = None UIGraphicsBeginPDFPage.argtypes = [] UIGraphicsEndPDFContext = c.UIGraphicsEndPDFContext UIGraphicsEndPDFContext.restype = None UIGraphicsEndPDFContext.argtypes = [] pdfdata = NSMutableData.alloc()#.init() ui_image = ui.Image.named('test:Lenna') uiimage = ObjCInstance(ui_image) w,h = ui_image.size frame = CGRect(CGPoint(0, 0), CGSize(w, h)) UIGraphicsBeginPDFContextToData(pdfdata, frame, None) UIGraphicsBeginPDFPage() pdfContext = UIGraphicsGetCurrentContext() uiimage.drawInRect_(frame) UIGraphicsEndPDFContext() # just to be sure that pdfdata is ok with open('a.pdf',mode='wb') as fil: b = nsdata_to_bytes(pdfdata) fil.write(b)
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πππ
If you are going straight to file, you might consider using
instead of creating the context as nsdata. Might save a few lines.
Also, you can use drawAtPoint instead of drawInRect, so that you don't need to specify w,h.
I think if you omit the frame when you create the context, it also create an 8.5x11.
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@JonB said:
so that you don't need to specify w,h.
Yes but UIGraphicsBeginPDFContextToData needs it also
Γdit: sorry, written before reading your last line
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I don't say it is the best way, it was only an exercice for me.
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@JonB said:
instead of creating the context as nsdata.
I added the file lines only to test /check pdfdata.