Question

我在不知道图片文件名或跟踪它的响应网址的情况下多次收到以下错误：

2012-08-20 08:14:34+0000 [spider] Unhandled Error
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/twisted/internet/defer.py", line 545, in _runCallbacks
    current.result = callback(current.result, *args, **kw)
  File "/usr/lib/python2.7/dist-packages/twisted/internet/defer.py", line 362, in callback
    self._startRunCallbacks(result)
  File "/usr/lib/python2.7/dist-packages/twisted/internet/defer.py", line 458, in _startRunCallbacks
    self._runCallbacks()
  File "/usr/lib/python2.7/dist-packages/twisted/internet/defer.py", line 545, in _runCallbacks
    current.result = callback(current.result, *args, **kw)
--- <exception caught here> ---
  File "/usr/lib/pymodules/python2.7/scrapy/contrib/pipeline/images.py", line 204, in media_downloaded
    checksum = self.image_downloaded(response, request, info)
  File "/usr/lib/pymodules/python2.7/scrapy/contrib/pipeline/images.py", line 252, in image_downloaded
    for key, image, buf in self.get_images(response, request, info):
  File "/usr/lib/pymodules/python2.7/scrapy/contrib/pipeline/images.py", line 261, in get_images
    orig_image = Image.open(StringIO(response.body))
  File "/usr/lib/python2.7/dist-packages/PIL/Image.py", line 1980, in open
    raise IOError("cannot identify image file")
exceptions.IOError: cannot identify image file

那么，我怎么能解决这个问题呢？因为我已经在settings.py

中定义了一定数量的错误后停止了我的蜘蛛

Answer 1

违规行在scrapy.contrib.pipelines.images.ImagesPipeline中使用PIL Image.open()：

def get_images(self, response, request, info):
    key = self.image_key(request.url)
    orig_image = Image.open(StringIO(response.body))

media_downloaded（）中的try块捕获了这个但发出错误：

except Exception:
    log.err(spider=info.spider)

您可以通过以下方式破解此文件：

try:
    key = self.image_key(request.url)
    checksum = self.image_downloaded(response, request, info)
except ImageException, ex:
    log.msg(str(ex), level=log.WARNING, spider=info.spider)
    raise
except IOError, ex:
    log.msg(str(ex), level=log.WARNING, spider=info.spider)
    raise ImageException
except Exception:
    log.err(spider=info.spider)
    raise ImageException

但更好的选择是创建自己的管道并覆盖pipelines.py文件中的image_downloaded（）方法：

from scrapy import log
from scrapy.contrib.pipeline.images import ImagesPipeline

class BkamImagesPipeline(ImagesPipeline):

    def image_downloaded(self, response, request, info):
        try:
            super(BkamImagesPipeline, self).image_downloaded(response, request, info)
        except IOError, ex:
            log.msg(str(ex), level=log.WARNING, spider=info.spider)

请务必在设置文件中声明此管道：

ITEM_PIPELINES = [
    'bkam.pipelines.BkamImagesPipeline',
]

scrapy错误：exceptions.IOError：无法识别图像文件

1 个答案: