help: loading binary image data into memory

[rixdelei]

Hi there!
Tried successfully downloading data into memory from internet using the
urllib module like this:
....
import urllib
import cStringIO

url_file = urllib.urlopen( url)
img = cStringIO.Strin gIO(url_file.re ad())
....
Was wondering HOW could I accomplish the same results using the ftplib
module
-> retrbinary( command, callback[, maxblocksize[, rest]])
WITHOUT saving any information to the disk;

Will appreciate your comments,
TIA+BRGDS

[Jeff Epler]

Re: help: loading binary image data into memory

probably something like this: (untested)
def make_ftplib_cal lback(f):
def callback(block) : f.write(block)
return callback
img = cStringIO.Strin gIO()
retrbinary( "get ???", make_ftplib_cal lback(img))

Jeff

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[Robert Kern]

Re: help: loading binary image data into memory

Jeff Epler wrote:[color=blue]
> probably something like this: (untested)
> def make_ftplib_cal lback(f):
> def callback(block) : f.write(block)
> return callback
> img = cStringIO.Strin gIO()
> retrbinary( "get ???", make_ftplib_cal lback(img))[/color]

Ummm, how about

img = cStringIO.Strin gIO()
retrbinary("get ???", img.write)

?

--
Robert Kern
rkern@ucsd.edu

"In the fields of hell where the grass grows high
Are the graves of dreams allowed to die."
-- Richard Harter

[Fredrik Lundh]

Re: help: loading binary image data into memory

Robert Kern wrote:
[color=blue][color=green]
>> probably something like this: (untested)
>> def make_ftplib_cal lback(f):
>> def callback(block) : f.write(block)
>> return callback
>> img = cStringIO.Strin gIO()
>> retrbinary( "get ???", make_ftplib_cal lback(img))[/color]
>
> Ummm, how about
>
> img = cStringIO.Strin gIO()
> retrbinary("get ???", img.write)[/color]

if you want some additional code to run during download, you can
always do something like:

img = cStringIO.Strin gIO()
def callback(block) :
sys.stdout.writ e(".")
img.write(block )
if img.tell() > LIMIT:
raise IOError("too much data")
retrbinary(..., callback())

(you don't really have to create a factory if all you need is a single
function...)

you can also get rid of the cStringIO module :

img = []
retrbinary(..., img.append)
# img is now a list of string chunks

might be more efficient, depending on what you plan to do with the
data once you've loaded it.

and finally,

img = urllib.urlopen( "ftp://...").read()

might also work.

</F>

[rixdelei]

Re: loading binary image data into memory


tx vm guys, helped a lot

"rixdelei" <rixdelei@hotma il.com> escribió en el mensaje
news:d3f6bo$2th b$1@news.wplus. net...[color=blue]
>
> Hi there!
> Tried successfully downloading data into memory from internet using the
> urllib module like this:
> ...
> import urllib
> import cStringIO
>
> url_file = urllib.urlopen( url)
> img = cStringIO.Strin gIO(url_file.re ad())
> ...
> Was wondering HOW could I accomplish the same results using the ftplib
> module
> -> retrbinary( command, callback[, maxblocksize[, rest]])
> WITHOUT saving any information to the disk;
>
> Will appreciate your comments,
> TIA+BRGDS
>[/color]