reportlab图像到PDF：“请致电tobytes（）”

Question

I'm trying to generate PDF's with Images.

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

Traceback:

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.

2nd Approach:

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()

Traceback:

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.

So it seems to not be code related.

I am running python on a server:

Python 2.6.6 (r266:84292, Nov 21 2013, 10:50:32) [GCC 4.4.7 20120313 (Red Hat 4.4.7-4)] on linux2

Version of Pillow: Pillow-3.2.0-py2.6-linux-x86_64.egg

Version of reportlab: reportlab-2.7-py2.6-linux-x86_64.egg

I searched for this particular error without success, what can I do to solve this?

Answer 1

From the traceback, you can see that reportlab is calling the tostring() method, which was deprecated by that commit in Pillow.

Thus, your code would probably work if you downgrade Pillow to version 3.1.

However, your version of reportlab is quite outdated as you have the version 2.7 and the version 3.3 is released. I didn't try it but I guess they fixed the issue and at least, it's worth to try!

The latest version of reportlab is not compatible with Python 2.6 but you should probably upgrade at least to Python 2.7, or even to Python 3 :)

Answer 2

I have been able to go on by monkey-patching Pillow. Don't do this at home:

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

Answer 3

Downgrading to pillow 2.9.0 worked for me on an ubuntu 14.04 using Pip. Just type:

 pip uninstall pillow
 pip install pillow==2.9.0

Hope it works for you