On 27-Aug-2010, at 2:48 AM, MRAB wrote: > On 26/08/2010 21:47, Navkirat Singh wrote: >> >> On 27-Aug-2010, at 1:57 AM, MRAB wrote: >> >>> On 26/08/2010 21:14, Navkirat Singh wrote: >>>> >>>> On 27-Aug-2010, at 1:32 AM, Dave Angel wrote: >>>> >>>>> Navkirat Singh wrote: >>>>>> Hey guys, >>>>>> >>>>>> I am programming a webserver, I receive a jpeg file with the POST >>>>>> method.The file (.jpeg) is encoded in bytes, I parse the bytes by >>>>>> decoding them to a string. I wanted to know how i could write the >>>>>> file (now a string) as a jpeg image on disk. When I try to encode the >>>>>> same string to a bytes and write them in binary format to disk, the >>>>>> file is not recognized as jpeg. I would be grateful if someone could >>>>>> help me with this. >>>>>> >>>>>> >>>>>> Regards, >>>>>> Nav >>>>> If by "decoding them to a string" you mean converting to Unicode, then >>>>> you've already trashed the data. That's only valid if the bytes had >>>>> been encoded from valid Unicode characters, and then only if you use >>>>> the corresponding decoding technique. >>>>> >>>>> If you mean some other decoding, then the question is meaningless >>>>> without telling us just what the decoding is, preferably with some code. >>>>> >>>>> It also might be useful to know what version of Python you're using, >>>>> when you post the code. >>>>> >>>>> DaveA >>>>> >>>> >>>> Dave, >>>> >>>> I am using Python3 and I receive a byte stream with a jpeg attached sent >>>> by the web browser over a socket, which looks like this: >>>> >>>> b': image/jpeg\r\nAccept: text/*\r\nReferer: >>>> http://127.0.0.1:8001/\r\nAccept-Language: en-us\r\nAccept-Encoding: >>>> gzip, deflate\r\nContent-Length: 91783\r\nConnection: >>>> keep-alive\r\n\r\n\xff\xd8\xff\xe0\x00\x10JFIF\x00\x01\x01\x00\x00\x01\x00\x01\x00\x00\xff\xdb\x00\x84\x00\x03\x02\x02\x03\x02\x02\x03\x03\x03\x03\x04\x03\x03\x04\x05\x08\x05\x05\x04\x04\x05\n\x07\x07\x06\x08\x0c\n\x0c\x0c\x0b\n\x0b\x0b\r\x0e\x12\x10\r\x0e\x11\x0e\x0b\x0b\x10\x16\x10\x11\x13\x14\x15\x15\x15\x0c\x0f >>>> >>>> From the above, I need to: >>>> >>>> a) Split the header content from the image content, which comes after >>>> the keep-alive\r\n\r\n part >>>> >>>> b) Then write the image content to file for further use as a jpeg. >>>> >>> Try: >>> >>> image = header.split(b'keep-alive\r\n\r\n', 1)[-1] >>> open(image_path, 'wb').write(image) >>> -- >>> http://mail.python.org/mailman/listinfo/python-list >> >> I think I forgot to mention that the original is a stream of bytes decoded >> using ISO-8859-1 as utf-8 trhrew errors (lack of knowlegdge again). >> >> @MRAB - the split() method in python 3 works only on strings and throws an >> error if I try to use bytes >> > All i can say is that it works for me: > > >>> header = b': image/jpeg\r\nAccept: text/*\r\nReferer: > >>> http://127.0.0.1:8001/\r\nAccept-Language: en-us\r\nAccept-Encoding: > >>> gzip, deflate\r\nContent-Length: 91783\r\nConnection: > >>> keep-alive\r\n\r\n\xff\xd8\xff\xe0\x00\x10JFIF\x00\x01\x01\x00\x00\x01\x00\x01\x00\x00\xff\xdb\x00\x84\x00\x03\x02\x02\x03\x02\x02\x03\x03\x03\x03\x04\x03\x03\x04\x05\x08\x05\x05\x04\x04\x05\n\x07\x07\x06\x08\x0c\n\x0c\x0c\x0b\n\x0b\x0b\r\x0e\x12\x10\r\x0e\x11\x0e\x0b\x0b\x10\x16\x10\x11\x13\x14\x15\x15\x15\x0c\x0f' > >>> image = header.split(b'keep-alive\r\n\r\n', 1)[-1] > >>> image > b'\xff\xd8\xff\xe0\x00\x10JFIF\x00\x01\x01\x00\x00\x01\x00\x01\x00\x00\xff\xdb\x00\x84\x00\x03\x02\x02\x03\x02\x02\x03\x03\x03\x03\x04\x03\x03\x04\x05\x08\x05\x05\x04\x04\x05\n\x07\x07\x06\x08\x0c\n\x0c\x0c\x0b\n\x0b\x0b\r\x0e\x12\x10\r\x0e\x11\x0e\x0b\x0b\x10\x16\x10\x11\x13\x14\x15\x15\x15\x0c\x0f' > > What error did you get? > -- > http://mail.python.org/mailman/listinfo/python-list
Hi MRAB, Here is the error: >>> b = b'asdf' >>> type(b) <class 'bytes'> >>> s = b.split(':') Traceback (most recent call last): File "<stdin>", line 1, in <module> TypeError: Type str doesn't support the buffer API >>> -- http://mail.python.org/mailman/listinfo/python-list