reportlab 图片转 PDF："please call tobytes()"

Question

我正在尝试生成带有图像的 PDF。

im = ImageReader('00001.png')
c = canvas.Canvas('networkanalyze.pdf', pagesize=A4)
c.drawImage(im, 10, 10, mask='auto')
c.showPage()
c.save()

回溯：

Traceback (most recent call last):
  File "pdf.py", line 9, in <module>
    c.drawImage(im, 10, 10, mask='auto')
  File "/usr/lib/python2.6/site-packages/reportlab-2.7-py2.6-linux-x86_64.egg/reportlab/pdfgen/canvas.py", line 909, in drawImage
    rawdata = image.getRGBData()
  File "/usr/lib/python2.6/site-packages/reportlab-2.7-py2.6-linux-x86_64.egg/reportlab/lib/utils.py", line 656, in getRGBData
    annotateException('\nidentity=%s'%self.identity())
  File "/usr/lib/python2.6/site-packages/reportlab-2.7-py2.6-linux-x86_64.egg/reportlab/lib/utils.py", line 653, in getRGBData
    self._data = im.tostring()
  File "/usr/lib/python2.6/site-packages/Pillow-3.2.0-py2.6-linux-x86_64.egg/PIL/Image.py", line 699, in tostring
    "Please call tobytes() instead.")
Exception: tostring() has been removed. Please call tobytes() instead.

第二种方法：

def generate_pdf(c):
    """
    letter :- (612.0, 792.0)
    """
    im = Image.open("00001.png")   
    c.drawInlineImage(im, 256, 720, width=100, height=60)

c = canvas.Canvas("report_image.pdf", pagesize=letter)
generate_pdf(c)
c.save()

回溯：

Traceback (most recent call last):
  File "pdf2.py", line 14, in <module>
    generate_pdf(c)
  File "pdf2.py", line 11, in generate_pdf
    c.drawInlineImage(im, 256, 720, width=100, height=60)
  File "/usr/lib/python2.6/site-packages/reportlab-2.7-py2.6-linux-x86_64.egg/reportlab/pdfgen/canvas.py", line 837, in drawInlineImage
    img_obj = PDFImage(image, x,y, width, height)
  File "/usr/lib/python2.6/site-packages/reportlab-2.7-py2.6-linux-x86_64.egg/reportlab/pdfgen/pdfimages.py", line 42, in __init__
    self.getImageData()
  File "/usr/lib/python2.6/site-packages/reportlab-2.7-py2.6-linux-x86_64.egg/reportlab/pdfgen/pdfimages.py", line 156, in getImageData
    imagedata, imgwidth, imgheight = self.PIL_imagedata()
  File "/usr/lib/python2.6/site-packages/reportlab-2.7-py2.6-linux-x86_64.egg/reportlab/pdfgen/pdfimages.py", line 117, in PIL_imagedata
    raw = myimage.tostring()
  File "/usr/lib/python2.6/site-packages/Pillow-3.2.0-py2.6-linux-x86_64.egg/PIL/Image.py", line 699, in tostring
    "Please call tobytes() instead.")
Exception: tostring() has been removed. Please call tobytes() instead.

所以好像和代码无关

我在运行 python 服务器上：

Python 2.6.6（r266:84292，2013 年 11 月 21 日，10:50:32） [GCC 4.4.7 20120313 (Red Hat 4.4.7-4)] linux2

枕头版本：Pillow-3.2.0-py2.6-linux-x86_64.egg

reportlab 版本：reportlab-2.7-py2.6-linux-x86_64.egg

我搜索了这个特定的错误但没有成功，我该怎么做才能解决这个问题？

Answer 1

从回溯中，您可以看到 reportlab 正在调用 tostring() 方法，该方法已被 Pillow 中的 that commit 弃用。

因此，如果您将 Pillow 降级到版本 3.1，您的代码可能会正常工作。

但是，您的 reportlab 版本已经过时，因为您的版本是 2.7 并且 version 3.3 已发布。我没有尝试过，但我想他们解决了这个问题，至少值得一试！

reportlab 的最新版本与 Python 2.6 不兼容，但您应该至少升级到 Python 2.7，甚至升级到 Python 3 :)

Answer 2

我已经能够通过猴子修补枕头继续下去了。不要在家里这样做：

from PIL import Image
# Bad hack
Image.Image.tostring = Image.Image.tobytes

Answer 3

使用 Pip 在 ubuntu 14.04 上降级到 pillow 2.9.0 对我有用。只需输入：

 pip uninstall pillow
 pip install pillow==2.9.0

希望对你有用

reportlab 图片转 PDF："please call tobytes()"

reportlab Image to PDF: "please call tobytes()"

python

pdf

reportlab

rhel

pillow