I want the file pointer set to 100 and overwrite everything from there
[snip]
def application(environ, response):
query=os.path.join(os.path.dirname(__file__),'teeeeeeeeeemp')
range=environ.get('HTTP_RANGE','bytes=0-').replace
('bytes=','').split(',')
offset=[]
for r in range: offset.append(r.split('-'))
with open(query,'w+') as f:
f.seek(int(offset[0][0]))
while True:
chunk=environ['wsgi.input'].read(8192).decode('latin1')
if not chunk: break
f.write(chunk)
f=open(query)
l=str(os.fstat(f.fileno()).st_size)
response('200 OK', [('Content-Type', 'text/plain'), ('Content-
Length', str(len(l)))])
return [l]
A couple items of note:
- you don't open the file in binary mode -- seek is more reliable
in binary mode :)
- if you want to lop off the rest of the file, use f.truncate()
An example:
# create the initial file
>>> f = file('zzz.zzz', 'wb+')
>>> f.write('abcdefghijklmnop')
>>> f.close()
>>> f = file('zzz.zzz', 'ab+')
>>> f.read() # show the existing content
'abcdefghijklmnop'
>>> f.seek(5) # seek to the desired offset
>>> f.truncate() # throw away everything after here
>>> f.write('zyx') # write the new data at pos=5
>>> f.close()
# demonstrate that it worked
>>> f = file('zzz.zzz', 'rb')
>>> f.read()
'abcdezyx'
>>> f.close()
also why must I open the file a second time to know how big it is ?
Likely the output has been buffered. You can try using
f.flush() # write all the data to the disk first
size = os.fstat(f.fileno()).st_size
which seems to do the trick for me.
-tkc
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