On Friday, 8 December 2017 02:18:32 UTC+1, edbo....@gmail.com wrote:
> On Thursday, 7 December 2017 14:02:49 UTC+1, Sergi Almacellas Abellana wrote:
> > El 07/12/17 a les 13:35, ha escrit:
> > > Hello All,
> > >
> > > We want to add dynamically created images to a report, but we can't get
> > > it working :-( . It's a generated 2D-barcode based on a product code. We
> > > added a frame an added on tab Options as name image: (record.barcode,
> > > 'image/png'), but we only get a strange line and not a 2D-barcode.
> > > We also added a binary-field to the product to see if that was going to
> > > work, but we get the same result.
> > >
> > > Does anybody got this working and can you provide an example?
> >
> > Which library are you using to generate the barcode?
>
> Because we want 2D-barcode (QR-code or Datamatrix) we cannot use pyBarcode.
> We use treepoem [1] which is a wrapper around and postscript barcode generator
>
> [1] https://github.com/YPlan/treepoem
>
> >
> > We are using pyBarcode without problems. Here is the relevant code:
> >
> > import barcode
> >
> > from barcode.writer import ImageWriter>
> > class Product:
> > barcode = fields.Function(fields.Binary("Barcode",
> > 'get_barcode')
> > def get_barcode(self, name):
> > fd = BytesIO()
> > barcode.generate(
> > 'ean13', self.code[:12].zfill(12),
> > writer=ImageWriter(), output=fd)
> > fd.seek(0)
> > return fields.Binary.cast(fd.read())
> > This should show without problems on the report.
>
> I've tried something similar with treepoem:
>
> def get_2dbarcode(self, name):
> fd = io.BytesIO()
> # generate 2D-barcode
> image = treepoem.generate_barcode(
> 'datamatrix',
> "THA00007", # normally this will be dynamic
> {},
> )
> image.save(fd, format="png")
> fd.seek(0)
> return fields.Binary.cast(fd.read())
>
> But no luck.
Got, it. It seems that you have to anchor the frame to a paragraph and not to
the page or character. So, to sum up:
# import the libraries
import io
import treepoem
# add a field to your model which generates the barcode
barcode = fields.Function(fields.Binary("Barcode", 'get_2dbarcode')
# define your function which creates the barcode
def get_2dbarcode(self, name):
fd = io.BytesIO()
# generate 2D-barcode
image = treepoem.generate_barcode(
'datamatrix',
self.code,
{},
)
image.save(fd, format="png")
fd.seek(0)
return fields.Binary.cast(fd.read())
And in your report:
Add a frame and make sure:
1. Anchor is on paragraph (tab "Type")
2. Name is (<your_record.barcode>, "image/png") (tab "Options")
I'm going to remove the field, because the code is auto-generated on first save
action and never changes.
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