reportlab圖像到PDF：“請致電tobytes（）”

Question

我正在嘗試使用圖像生成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.

第二種方法：

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.

所以它似乎與代碼無關。

我在服務器上運行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

枕頭版：Pillow-3.2.0-py2.6-linux-x86_64.egg

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

我沒有成功搜索這個特殊錯誤，我該怎么做才能解決這個問題？

Answer 1

從回溯中，您可以看到reportlab正在調用tostring()方法，該方法在Pillow中被該提交棄用。

因此，如果將Pillow降級到3.1版，您的代碼可能會有效。

但是，您的版本的reportlab已經過時，因為您擁有版本2.7並且版本3.3已發布。 我沒試過，但我想他們已經解決了這個問題，至少，值得一試！

reportlab的最新版本與Python 2.6不兼容，但你應該至少升級到Python 2.7，甚至升級到Python 3 :)

Answer 2

我已經能夠通過猴子修補Pillow繼續。 不要在家里這樣做：

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

Answer 3

降級到枕頭2.9.0使用Pip在ubuntu 14.04上為我工作。 只需輸入：

 pip uninstall pillow
 pip install pillow==2.9.0

希望這對你有用