Problem with Image: Opening a file

M

mcl

I am obviously doing something stupid or not understanding the
difference between HTML file references and python script file
references.

I am trying to create a thumbnail of an existing .jpg file. It is in
the directory 'temp', which is below my script

I can display the file with <img>, but Image.open does not see it.

I think it is probably a path problem, but I have tried '/temp/
fred.jpg' and './temp/fred.jpg'

Can anyone help, please

PS I am using mod_python on a Linux Apache 2 and python 2.5

CODE =================================================

import os
import StringIO

def index(req):
main(req)

def writeHTMLHeader(req):

req.content_type = "text/html"
req.write('<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//
EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">')
req.write('<html xmlns="http://www.w3.org/1999/xhtml" lang="en"
xml:lang="en">')
req.write('<head><title>My Tests: Python</title></head>')
req.write('<body>')

def writeHTMLTrailer(req):
req.write('</body>')
req.write('</html>')

def writelineHTML(req, htmlMSG):
req.write(htmlMSG + '<BR>\n')


def createThumb(req, infile, maxwidth, maxheight):
import Image
import os
infile = "temp/fred.jpg"
outfile = "temp/fred_th.jpg"
if infile != outfile:

writelineHTML(req, "Opening %s" % str(infile))
writelineHTML(req, '<img src="%s"></img>' % infile) # Finds
File OK ***********************
im =
Image.open(infile) #
ERRORS on the same file *********************
im.thumbnail((maxwidth,maxheight),Image.ANTIALIAS)
im.save(outfile, "JPEG")
writelineHTML(req, "Created: " + str(outfile))
writelineHTML(req, '<img src="%s"></img>' % outfile)

return outfile

return ""

def showThumbnail(req, picture):
myThumb = createThumb(req, picture, 60, 60)
if myThumb:
writelineHTML(req, '<img src="%s></img>' % myThumb)
else:
writelineHTML(req, "Thumb %s Not Created" % myThumb)


def main(req):
writeHTMLHeader(req)
picture = "temp/fred.jpg"
showThumbnail(req, picture)
writeHTMLTrailer(req)

ERROR ==============================================

File "/home/mcl/htdocs/timslists/thumbs2.py", line 33, in
createThumb
im = Image.open(infile)

File "/usr/lib/python2.5/site-packages/PIL/Image.py", line 1888, in
open
fp = __builtin__.open(fp, "rb")

IOError: [Errno 2] No such file or directory: 'temp/fred.jpg'

Richard
 
G

Graham Dumpleton

I am obviously doing something stupid or not understanding the
difference between HTML file references and python script file
references.

I am trying to create a thumbnail of an existing .jpg file. It is in
the directory 'temp', which is below my script

I can display the file with <img>, but Image.open does not see it.

I think it is probably a path problem, but I have tried '/temp/
fred.jpg' and './temp/fred.jpg'

Can anyone help, please

PS I am usingmod_pythonon a Linux Apache 2 and python 2.5

CODE =================================================

import os
import StringIO

def index(req):
main(req)

def writeHTMLHeader(req):

req.content_type = "text/html"
req.write('<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//
EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">')
req.write('<html xmlns="http://www.w3.org/1999/xhtml" lang="en"
xml:lang="en">')
req.write('<head><title>My Tests: Python</title></head>')
req.write('<body>')

def writeHTMLTrailer(req):
req.write('</body>')
req.write('</html>')

def writelineHTML(req, htmlMSG):
req.write(htmlMSG + '<BR>\n')

def createThumb(req, infile, maxwidth, maxheight):
import Image
import os
infile = "temp/fred.jpg"
outfile = "temp/fred_th.jpg"
if infile != outfile:

writelineHTML(req, "Opening %s" % str(infile))
writelineHTML(req, '<img src="%s"></img>' % infile) # Finds
File OK ***********************
im =
Image.open(infile) #
ERRORS on the same file *********************
im.thumbnail((maxwidth,maxheight),Image.ANTIALIAS)
im.save(outfile, "JPEG")
writelineHTML(req, "Created: " + str(outfile))
writelineHTML(req, '<img src="%s"></img>' % outfile)

return outfile

return ""

def showThumbnail(req, picture):
myThumb = createThumb(req, picture, 60, 60)
if myThumb:
writelineHTML(req, '<img src="%s></img>' % myThumb)
else:
writelineHTML(req, "Thumb %s Not Created" % myThumb)

def main(req):
writeHTMLHeader(req)
picture = "temp/fred.jpg"
showThumbnail(req, picture)
writeHTMLTrailer(req)

ERROR ==============================================

File "/home/mcl/htdocs/timslists/thumbs2.py", line 33, in
createThumb
im = Image.open(infile)

File "/usr/lib/python2.5/site-packages/PIL/Image.py", line 1888, in
open
fp = __builtin__.open(fp, "rb")

IOError: [Errno 2] No such file or directory: 'temp/fred.jpg'

Richard
Click to expand...

Code under mod_python will typically run as Apache user. This means
that when writing files the location you use must be writable to the
Apache user. Do note though that the working directory of Apache is
not guaranteed and you must always use an absolute path to the
location you are saving files, you cannot reliably use relative paths
like you are.

BTW, do you perhaps mean '/tmp/fred.jpg'? There is no '/temp'
directory on Linux boxes.

Graham
 
M

mcl

I am obviously doing something stupid or not understanding the
difference between HTML file references and python script file
references.
Click to expand...
I am trying to create a thumbnail of an existing .jpg file. It is in
the directory 'temp', which is below my script
Click to expand...
I can display the file with <img>, but Image.open does not see it.
Click to expand...
I think it is probably a path problem, but I have tried '/temp/
fred.jpg' and './temp/fred.jpg'
Click to expand...
Can anyone help, please
Click to expand...
PS I am usingmod_pythonon a Linux Apache 2 and python 2.5
Click to expand...
CODE =================================================
Click to expand...
import os
import StringIO
Click to expand...
def index(req):
main(req)
Click to expand...
def writeHTMLHeader(req):
Click to expand...
req.content_type = "text/html"
req.write('<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//
EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">')
req.write('<html xmlns="http://www.w3.org/1999/xhtml" lang="en"
xml:lang="en">')
req.write('<head><title>My Tests: Python</title></head>')
req.write('<body>')
Click to expand...
def writeHTMLTrailer(req):
req.write('</body>')
req.write('</html>')
Click to expand...
def writelineHTML(req, htmlMSG):
req.write(htmlMSG + '<BR>\n')
Click to expand...
def createThumb(req, infile, maxwidth, maxheight):
import Image
import os
infile = "temp/fred.jpg"
outfile = "temp/fred_th.jpg"
if infile != outfile:
Click to expand...
writelineHTML(req, "Opening %s" % str(infile))
writelineHTML(req, '<img src="%s"></img>' % infile) # Finds
File OK ***********************
im =
Image.open(infile) #
ERRORS on the same file *********************
im.thumbnail((maxwidth,maxheight),Image.ANTIALIAS)
im.save(outfile, "JPEG")
writelineHTML(req, "Created: " + str(outfile))
writelineHTML(req, '<img src="%s"></img>' % outfile)
Click to expand...
return outfile
Click to expand...
return ""
Click to expand...
def showThumbnail(req, picture):
myThumb = createThumb(req, picture, 60, 60)
if myThumb:
writelineHTML(req, '<img src="%s></img>' % myThumb)
else:
writelineHTML(req, "Thumb %s Not Created" % myThumb)
Click to expand...
def main(req):
writeHTMLHeader(req)
picture = "temp/fred.jpg"
showThumbnail(req, picture)
writeHTMLTrailer(req)
Click to expand...
ERROR ==============================================
Click to expand...
File "/home/mcl/htdocs/timslists/thumbs2.py", line 33, in
createThumb
im = Image.open(infile)
Click to expand...
File "/usr/lib/python2.5/site-packages/PIL/Image.py", line 1888, in
open
fp = __builtin__.open(fp, "rb")
Click to expand...
IOError: [Errno 2] No such file or directory: 'temp/fred.jpg'
Click to expand...
Richard
Click to expand...

Code under mod_python will typically run as Apache user. This means
that when writing files the location you use must be writable to the
Apache user. Do note though that the working directory of Apache is
not guaranteed and you must always use an absolute path to the
location you are saving files, you cannot reliably use relative paths
like you are.

BTW, do you perhaps mean '/tmp/fred.jpg'? There is no '/temp'
directory on Linux boxes.

Graham
Click to expand...

Graham,

Thanks for the explanation.

The answer is/was

Python script os.path.dirname(__file__) + '/mydir/temp/fred.jpg'
HTML 'temp/fred.jpg'

Thanks again

Richard
 

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