TypeError: a bytes-like object is required, not 'Drawing'
TypeError: a bytes-like object is required, not 'Drawing'
我正在尝试将字母数字值转换为 PNG，然后再转换为 ZPL 格式。它们都有不同的库，独立使用时它们工作正常。看代码：
from base64 import b64encode
from reportlab.lib import units
from reportlab.graphics import renderPM
from reportlab.graphics.barcode import createBarcodeDrawing
from reportlab.graphics.shapes import Drawing
import os
def get_barcode(value, width, barWidth = 0.05 * units.inch, fontSize = 30, humanReadable = True):
barcode = createBarcodeDrawing('Code128', value = value, barWidth = barWidth, fontSize = fontSize)
drawing_width = width
barcode_scale = drawing_width / barcode.width
drawing_height = barcode.height * barcode_scale
drawing = Drawing(drawing_width, drawing_height)
drawing.scale(barcode_scale, barcode_scale)
drawing.add(barcode, name='barcode')
return drawing
sku = [] #rough data
path = r'C:\Users\Rahul\Desktop\Barcodes'
for i in range(0,10):
sku.append('A10{}'.format(i))
for i in sku:
barcode = get_barcode(value = i, width = 600)
barcode.save(formats=['PNG'],outDir=path,fnRoot=i)
这会生成 PNG 格式的条形码
现在转换为 ZPL 是这样的：
from zplgrf import GRF
with open(r'C:\Users\Rahul\Desktop\Barcodes\A100.png','rb') as image:
grf = GRF.from_image(image.read(), 'DEMO')
grf.optimise_barcodes()
print(grf.to_zpl())
输出：
~DGR:DEMO.GRF,5400,75,:Z64:eJztlrENxSAMRI8qJSMwCpv9hM0YhRFSUnxxQelSfn0jEXQuaECW3/kMAHdsTBUfwNWQEQhEeDbEtmVHJhZXEVn2b1+ZydI8j36whr6HR3i7VIZV/ZPqXB3QsIPnsKomARznKwEKUIACFOAkWgnwdYCGFl3+JyPAtwMaVqVnQreoZnAqX60HOE6r9QANO6gZ/F2rCxESD8A=:4C36^XA^MMC,Y^PON^MNY^FO0,0^XGR:DEMO.GRF,1,1^FS^PQ1,0,0,N^XZ^XA^IDR:DEMO.GRF^FS^XZ
我想做的是消除保存文件然后再次读取文件进行转换的过程，所以我这样做了：
for i in sku:
barcode = get_barcode(value = i, width = 600)
barcode.save(formats=['PNG'],fnRoot=i)
print(barcode)
grf = GRF.from_image(barcode, 'DEMO')
grf.optimise_barcodes()
print(grf.to_zpl())
但我收到以下错误：
TypeError: a bytes-like object is required, not 'Drawing'
如何将以下对象转换为"bytes-like"对象？？
<reportlab.graphics.shapes.Drawing object at 0x000001BF2C59DF28>
错误：
---------------------------------------------------------------------------
TypeError Traceback (most recent call last)
<ipython-input-14-2b88439d6661> in <module>
3 barcode.save(formats=['PNG'],fnRoot=i)
4 print(barcode)
----> 5 grf = GRF.from_image(barcode, 'DEMO')
6 grf.optimise_barcodes()
7 print(grf.to_zpl())
~\Anaconda3\lib\site-packages\zplgrf\__init__.py in from_image(cls, image, filename)
354 """
355
--> 356 source = Image.open(BytesIO(image))
357 source = source.convert('1')
358 width = int(math.ceil(source.size[0] / 8.0))
TypeError: a bytes-like object is required, not 'Drawing'
要调用GRF.from_image，您需要传递一个类似字节的对象。目前，您已将 Drawing 保存为 png 文件，然后将其传递给该函数。相反，您应该打开保存的 png 文件并将读取的对象传递给 from_image，例如：
with open(barcode_file, "rb") as image:
grf = GRF.from_image(image.read(), "DEMO")
os.remove(barcode_file)
其中 barcode_file 是您的 Drawing 的保存路径。 os.remove可用于读取临时文件后将其删除。
为避免创建这样的临时文件，您可以使用 Drawing class 的 asString 方法并将结果传递给 from_image:
grf = GRF.from_image(barcode.asString("png"), "DEMO")
我正在尝试将字母数字值转换为 PNG，然后再转换为 ZPL 格式。它们都有不同的库，独立使用时它们工作正常。看代码：
from base64 import b64encode
from reportlab.lib import units
from reportlab.graphics import renderPM
from reportlab.graphics.barcode import createBarcodeDrawing
from reportlab.graphics.shapes import Drawing
import os
def get_barcode(value, width, barWidth = 0.05 * units.inch, fontSize = 30, humanReadable = True):
barcode = createBarcodeDrawing('Code128', value = value, barWidth = barWidth, fontSize = fontSize)
drawing_width = width
barcode_scale = drawing_width / barcode.width
drawing_height = barcode.height * barcode_scale
drawing = Drawing(drawing_width, drawing_height)
drawing.scale(barcode_scale, barcode_scale)
drawing.add(barcode, name='barcode')
return drawing
sku = [] #rough data
path = r'C:\Users\Rahul\Desktop\Barcodes'
for i in range(0,10):
sku.append('A10{}'.format(i))
for i in sku:
barcode = get_barcode(value = i, width = 600)
barcode.save(formats=['PNG'],outDir=path,fnRoot=i)
这会生成 PNG 格式的条形码 现在转换为 ZPL 是这样的：
from zplgrf import GRF
with open(r'C:\Users\Rahul\Desktop\Barcodes\A100.png','rb') as image:
grf = GRF.from_image(image.read(), 'DEMO')
grf.optimise_barcodes()
print(grf.to_zpl())
输出：
~DGR:DEMO.GRF,5400,75,:Z64:eJztlrENxSAMRI8qJSMwCpv9hM0YhRFSUnxxQelSfn0jEXQuaECW3/kMAHdsTBUfwNWQEQhEeDbEtmVHJhZXEVn2b1+ZydI8j36whr6HR3i7VIZV/ZPqXB3QsIPnsKomARznKwEKUIACFOAkWgnwdYCGFl3+JyPAtwMaVqVnQreoZnAqX60HOE6r9QANO6gZ/F2rCxESD8A=:4C36^XA^MMC,Y^PON^MNY^FO0,0^XGR:DEMO.GRF,1,1^FS^PQ1,0,0,N^XZ^XA^IDR:DEMO.GRF^FS^XZ
我想做的是消除保存文件然后再次读取文件进行转换的过程，所以我这样做了：
for i in sku:
barcode = get_barcode(value = i, width = 600)
barcode.save(formats=['PNG'],fnRoot=i)
print(barcode)
grf = GRF.from_image(barcode, 'DEMO')
grf.optimise_barcodes()
print(grf.to_zpl())
但我收到以下错误：
TypeError: a bytes-like object is required, not 'Drawing'
如何将以下对象转换为"bytes-like"对象？？
<reportlab.graphics.shapes.Drawing object at 0x000001BF2C59DF28>
错误：
---------------------------------------------------------------------------
TypeError Traceback (most recent call last)
<ipython-input-14-2b88439d6661> in <module>
3 barcode.save(formats=['PNG'],fnRoot=i)
4 print(barcode)
----> 5 grf = GRF.from_image(barcode, 'DEMO')
6 grf.optimise_barcodes()
7 print(grf.to_zpl())
~\Anaconda3\lib\site-packages\zplgrf\__init__.py in from_image(cls, image, filename)
354 """
355
--> 356 source = Image.open(BytesIO(image))
357 source = source.convert('1')
358 width = int(math.ceil(source.size[0] / 8.0))
TypeError: a bytes-like object is required, not 'Drawing'
要调用GRF.from_image，您需要传递一个类似字节的对象。目前，您已将 Drawing 保存为 png 文件，然后将其传递给该函数。相反，您应该打开保存的 png 文件并将读取的对象传递给 from_image，例如：
with open(barcode_file, "rb") as image:
grf = GRF.from_image(image.read(), "DEMO")
os.remove(barcode_file)
其中 barcode_file 是您的 Drawing 的保存路径。 os.remove可用于读取临时文件后将其删除。
为避免创建这样的临时文件，您可以使用 Drawing class 的 asString 方法并将结果传递给 from_image:
grf = GRF.from_image(barcode.asString("png"), "DEMO")