python – reportlab图像到PDF：“请致电tobytes()”

2019年8月3日 145次阅读

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)
Linux2上的[GCC 4.4.7 20120313(Red Hat 4.4.7-4)]

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的错误,
我该怎么做才能解决这个问题？

最佳答案 从回溯中,您可以看到reportlab正在调用tostring()方法,该方法在Pillow中被
that commit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,因为您的版本为2.7并且version 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 🙂

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