关于python：reportlab图像到PDF：“请调用tobytes（）”

reportlab Image to PDF: “please call tobytes()”

我正在尝试用图像生成PDF。

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

回溯：

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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('
identity=%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.

号

第二种方法：

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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：

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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)】关于Linux2

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

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

我搜索这个错误没有成功，我能做些什么来解决这个问题？

从回溯中，您可以看到reportlab正在调用tostring()方法，这个方法被枕头中的commit所否决。

因此，如果您将枕头降级到3.1版，您的代码可能会工作。

但是，您的ReportLab版本已经过时，因为您拥有2.7版和3.3版。我没试过，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:。