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From: Dodo on 28 Apr 2010 17:54
Help! this is driving me crazy lol
I want to print raw binary data to display an image file
BUT
python3 outputs b'<binary data>' instead of <binary data>.... so the
browser can't read the image!!

f = open("/some/path/%s" % x, 'rb')
print(f.read())



any idea?
Dorian
From: Gary Herron on 28 Apr 2010 18:08
Dodo wrote:
> Help! this is driving me crazy lol
> I want to print raw binary data to display an image file
> BUT
> python3 outputs b'<binary data>' instead of <binary data>.... so the
> browser can't read the image!!
>
> f = open("/some/path/%s" % x, 'rb')
> print(f.read())
>
>
>
> any idea?
> Dorian


Huh??? In what universe does printing raw binary data display an image?

But it that's what you want -- don't use print (which formats objects
for human reading), and don't use standard output (which is a text
stream in Python3). Instead, open your own stream in binary mode, and
write (not print) to that stream.


From: Antoine Pitrou on 28 Apr 2010 19:45
Le Wed, 28 Apr 2010 23:54:07 +0200, Dodo a écrit :

> Help! this is driving me crazy lol
> I want to print raw binary data to display an image file BUT
> python3 outputs b'<binary data>' instead of <binary data>.... so the
> browser can't read the image!!
>
> f = open("/some/path/%s" % x, 'rb')
> print(f.read())

print() implicitly converts its arguments to str (i.e. unicode strings)
and then writes them to sys.stdout, which is a text IO wrapper.
If you want to bypass the unicode layer, you have to use
sys.stdout.buffer instead.
That is:

sys.stdout.buffer.write(f.read())

Regards

Antoine.

From: Dodo on 29 Apr 2010 06:53
Le 29/04/2010 01:45, Antoine Pitrou a écrit :
> Le Wed, 28 Apr 2010 23:54:07 +0200, Dodo a écrit :
>
>> Help! this is driving me crazy lol
>> I want to print raw binary data to display an image file BUT
>> python3 outputs b'<binary data>' instead of<binary data>.... so the
>> browser can't read the image!!
>>
>> f = open("/some/path/%s" % x, 'rb')
>> print(f.read())
>
> print() implicitly converts its arguments to str (i.e. unicode strings)
> and then writes them to sys.stdout, which is a text IO wrapper.
> If you want to bypass the unicode layer, you have to use
> sys.stdout.buffer instead.
> That is:
>
> sys.stdout.buffer.write(f.read())
>
> Regards
>
> Antoine.
>

@Gary : How do I reply to a http request then?

@Antoine : It not sys.stdout.buffer.write but sys.stdout.write()
instead. But it still doesn't work, now I have empty content

#!/usr/bin/python3
import cgi, os, sys
form = cgi.FieldStorage()
all = os.listdir("/some/path/with/files/")
for x in all:
if x.find( form['id'].value ) != -1:
ext = x.split(".")[-1]
print("Content-type:image/%s\n\n" % ext)
f = open("/some/path/with/files/%s" % x, 'rb')
sys.stdout.write( f.read() )
f.close()
break

Dorian
From: Antoine Pitrou on 29 Apr 2010 11:07
Le Thu, 29 Apr 2010 12:53:53 +0200, Dodo a écrit :
>
> @Antoine : It not sys.stdout.buffer.write but sys.stdout.write()
> instead. But it still doesn't work, now I have empty content

Let me insist: please use sys.stdout.buffer.write().
You'll also have to call sys.stdout.flush() before doing so.


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