this error "
raise OSError(f"cannot find loader for this {self.format} file")
OSError: cannot find loader for this HDF5 file
<pre>class StubImageFile(ImageFile):
"""
Base class for stub image loaders.
A stub loader is an image loader that can identify files of a
certain format, but relies on external code to load the file.
"""
def _open(self):
raise NotImplementedError("StubImageFile subclass must implement _open")
def load(self):
loader = self._load()
if loader is None:
raise OSError(f"cannot find loader for this {self.format} file")
image = loader.load(self)
assert image is not None
# become the other object (!)
self.__class__ = image.__class__
self.__dict__ = image.__dict__
def _load(self):
"""(Hook) Find actual image loader."""
raise NotImplementedError("StubImageFile subclass must implement _load")
class Parser:
"""
Incremental image parser. This class implements the standard
feed/close consumer interface.
"""
incremental = None
image = None
data = None
decoder = None
offset = 0
finished = 0
def reset(self):
"""
(Consumer) Reset the parser. Note that you can only call this
method immediately after you've created a parser; parser
instances cannot be reused.
"""
assert self.data is None, "cannot reuse parsers"
def feed(self, data):
"""
(Consumer) Feed data to the parser.
:param data: A string buffer.
:exception OSError: If the parser failed to parse the image file.
"""
# collect data
if self.finished:
return
if self.data is None:
self.data = data
else:
self.data = self.data + data
# parse what we have
if self.decoder:
if self.offset > 0:
# skip header
skip = min(len(self.data), self.offset)
self.data = self.data[skip:]
self.offset = self.offset - skip
if self.offset > 0 or not self.data:
return
n, e = self.decoder.decode(self.data)
if n < 0:
# end of stream
self.data = None
self.finished = 1
if e < 0:
# decoding error
self.image = None
raise_oserror(e)
else:
# end of image
return
self.data = self.data[n:]
elif self.image:
# if we end up here with no decoder, this file cannot
# be incrementally parsed. wait until we've gotten all
# available data
pass
else:
# attempt to open this file
try:
with io.BytesIO(self.data) as fp:
im = Image.open(fp)
except OSError:
# traceback.print_exc()
pass # not enough data
else:
flag = hasattr(im, "load_seek") or hasattr(im, "load_read")
if flag or len(im.tile) != 1:
# custom load code, or multiple tiles
self.decode = None
else:
# initialize decoder
im.load_prepare()
d, e, o, a = im.tile[0]
im.tile = []
self.decoder = Image._getdecoder(im.mode, d, a, im.decoderconfig)
self.decoder.setimage(im.im, e)
# calculate decoder offset
self.offset = o
if self.offset <= len(self.data):
self.data = self.data[self.offset :]
self.offset = 0
self.image = im
def __enter__(self):
return self
def __exit__(self, *args):
self.close()
def close(self):
"""
(Consumer) Close the stream.
:returns: An image object.
:exception OSError: If the parser failed to parse the image file either
because it cannot be identified or cannot be
decoded.
"""
# finish decoding
if self.decoder:
# get rid of what's left in the buffers
self.feed(b"")
self.data = self.decoder = None
if not self.finished:
raise OSError("image was incomplete")
if not self.image:
raise OSError("cannot parse this image")
if self.data:
# incremental parsing not possible; reopen the file
# not that we have all data
with io.BytesIO(self.data) as fp:
try:
self.image = Image.open(fp)
finally:
self.image.load()
return self.image
# --------------------------------------------------------------------
def _save(im, fp, tile, bufsize=0):
"""Helper to save image based on tile list
:param im: Image object.
:param fp: File object.
:param tile: Tile list.
:param bufsize: Optional buffer size
"""
im.load()
if not hasattr(im, "encoderconfig"):
im.encoderconfig = ()
tile.sort(key=_tilesort)
# FIXME: make MAXBLOCK a configuration parameter
# It would be great if we could have the encoder specify what it needs
# But, it would need at least the image size in most cases. RawEncode is
# a tricky case.
bufsize = max(MAXBLOCK, bufsize, im.size[0] * 4) # see RawEncode.c
if fp == sys.stdout:
fp.flush()
return
try:
fh = fp.fileno()
fp.flush()
except (AttributeError, io.UnsupportedOperation) as exc:
# compress to Python file-compatible object
for e, b, o, a in tile:
e = Image._getencoder(im.mode, e, a, im.encoderconfig)
if o > 0:
fp.seek(o)
e.setimage(im.im, b)
if e.pushes_fd:
e.setfd(fp)
l, s = e.encode_to_pyfd()
else:
while True:
l, s, d = e.encode(bufsize)
fp.write(d)
if s:
break
if s < 0:
raise OSError(f"encoder error {s} when writing image file") from exc
e.cleanup()
else:
# slight speedup: compress to real file object
for e, b, o, a in tile:
e = Image._getencoder(im.mode, e, a, im.encoderconfig)
if o > 0:
fp.seek(o)
e.setimage(im.im, b)
if e.pushes_fd:
e.setfd(fp)
l, s = e.encode_to_pyfd()
else:
s = e.encode_to_file(fh, bufsize)
if s < 0:
raise OSError(f"encoder error {s} when writing image file")
e.cleanup()
if hasattr(fp, "flush"):
fp.flush()
What I have tried:
I'm not exactely inderstand what's mean that error
Submit an article or tip