reportlab图像到PDF：“请致电tobytes（）”

Question

我正在尝试使用图像生成PDF。

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

追溯：

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()

追溯：

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.

所以它似乎与代码无关。

我在服务器上运行python：

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）] on linux2

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

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

我没有成功搜索这个特殊错误，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，该方法在Pillow中被该提交弃用。

因此，如果将Pillow降级到3.1版，您的代码可能会有效。

但是，您的版本的reportlab已经过时，因为您拥有版本2.7并且版本3.3已发布。 我没试过，但我想他们已经解决了这个问题，至少，值得一试！

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

Answer 2

我已经能够通过猴子修补Pillow继续。 不要在家里这样做：

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

Answer 3

降级到枕头2.9.0使用Pip在ubuntu 14.04上为我工作。 只需输入：

 pip uninstall pillow
 pip install pillow==2.9.0

希望这对你有用