can't flush print when download open-uri

[T. Onoma]

I'm confused. why won't this print? I tried flushing the $defout and $stdout as well as the source_file_io, but that doesn't work either.

# download
prioritized_locations.each do |location|
begin
source_file_io = File.open(self.source_path,'w')
remote_file = open(location)
while incoming = remote_file.read(512)
source_file_io.write(incoming)
# THIS WON'T THIS PRINT!!!!!!!!!!!
print "\ca{source_file_io.pos}KB/#{@source_size}KB"
end
rescue
puts "#{location} failed"
remote_file.close unless remote_file.nil?
source_file_io.close unless source_file_io.nil?
next # try next location
else
puts ' Done.'
break # we got it
ensure
remote_file.close unless remote_file.nil?
source_file_io.close unless source_file_io.nil?
end
end

-t0

[Robert Klemme]

Maybe it's because you didn't terminate with "\n".

"T. Onoma" <transami@runbox.com> schrieb im Newsbeitrag
news:E1AJs2a-0004hd-RA@odie.runbox.com...

> I'm confused. why won't this print? I tried flushing the $defout and

$stdout as well as the source_file_io, but that doesn't work either.

I'd try $defout.sync=true then you don't need the flushes.

> # download
> prioritized_locations.each do |location|
> begin
> source_file_io = File.open(self.source_path,'w')
> remote_file = open(location)
> while incoming = remote_file.read(512)
> source_file_io.write(incoming)
> # THIS WON'T THIS PRINT!!!!!!!!!!!
> print "\ca{source_file_io.pos}KB/#{@source_size}KB"

did you mean

print "#{source_file_io.pos}KB/#{@source_size}KB\n"

?

> end
> rescue
> puts "#{location} failed"

> remote_file.close unless remote_file.nil?
> source_file_io.close unless source_file_io.nil?

Closing here is superfluous since "ensure" takes care of that.

> next # try next location

superfluous as well.

> else
> puts ' Done.'
> break # we got it

superfluous as well.

> ensure
> remote_file.close unless remote_file.nil?
> source_file_io.close unless source_file_io.nil?
> end
> end

In the end we get much cleaner code:

require 'open-uri'

# download
$defout.sync = true

prioritized_locations.each do |location|
begin
File.open(self.source_path,'w') do |source_file_io|
open(location) do |remote_file|
while incoming = remote_file.read(512)
source_file_io.write(incoming)
print "#{source_file_io.pos}KB/#{@source_size}KB "
end
end
end
rescue => e
$stderr.puts "#{location} failed: #{e}"
else
puts 'Done.'
end
end

This works for me - and does print.

robert

[T. Onoma]

no one responded to this and i still can't get it to work. please help. let me rephrase very simply:

downloading file with open_uri and can't flush print to report download progress.

thanks,
-t0

> I'm confused. why won't this print? I tried flushing the $defout and $stdout as well as the source_file_io, but that doesn't work either.
>
> # download
> prioritized_locations.each do |location|
> begin
> source_file_io = File.open(self.source_path,'w')
> remote_file = open(location)
> while incoming = remote_file.read(512)
> source_file_io.write(incoming)
> # THIS WON'T THIS PRINT!!!!!!!!!!!
> print "\ca{source_file_io.pos}KB/#{@source_size}KB"
> end
> rescue
> puts "#{location} failed"
> remote_file.close unless remote_file.nil?
> source_file_io.close unless source_file_io.nil?
> next # try next location
> else
> puts ' Done.'
> break # we got it
> ensure
> remote_file.close unless remote_file.nil?
> source_file_io.close unless source_file_io.nil?
> end
> end
>
> -t0
>
>

[Bill Kelly]

Hi,

From: "T. Onoma" <transami@runbox.com>

>
> no one responded to this and i still can't get it to work. please help.
> let me rephrase very simply:
>
> downloading file with open_uri and can't flush print to report download progress.
>

[...]

>

> > while incoming = remote_file.read(512)
> > source_file_io.write(incoming)
> > # THIS WON'T THIS PRINT!!!!!!!!!!!
> > print "\ca{source_file_io.pos}KB/#{@source_size}KB"
> > end

Have you tried stdout.sync = true ?

--------------------------------------------------------------- IO#sync=
ios.sync = aBoolean -> aBoolean
------------------------------------------------------------------------
Sets the ``sync mode'' to true or false. When sync mode is true,
all output is immediately flushed to the underlying operating
system and is not buffered internally. Returns the new state. See
also IO#fsync.
f = File.new("testfile")
f.sync = true
(produces no output)


Hope this helps,

Bill

[T. Onoma]

no one responded to this and i still can't get it to work. please help. let me rephrase very simply:

downloading file with open_uri and can't flush print to report download progress.

thanks,
-t0

> I'm confused. why won't this print? I tried flushing the $defout and $stdout as well as the source_file_io, but that doesn't work either.
>
> # download
> prioritized_locations.each do |location|
> begin
> source_file_io = File.open(self.source_path,'w')
> remote_file = open(location)
> while incoming = remote_file.read(512)
> source_file_io.write(incoming)
> # THIS WON'T THIS PRINT!!!!!!!!!!!
> print "\ca{source_file_io.pos}KB/#{@source_size}KB"
> end
> rescue
> puts "#{location} failed"
> remote_file.close unless remote_file.nil?
> source_file_io.close unless source_file_io.nil?
> next # try next location
> else
> puts ' Done.'
> break # we got it
> ensure
> remote_file.close unless remote_file.nil?
> source_file_io.close unless source_file_io.nil?
> end
> end
>
> -t0

[T. Onoma]

> Have you tried stdout.sync = true ?

Yep. Dosen't work either. Thanks though. Boy is this frustrating. There must be a simple way to do this.


P.S. SORRY ABOUT THE MULTIPLE POST. MAIL SERVER ACTING UP.

[Bill Kelly]

From: "T. Onoma" <transami@runbox.com>

>

> > Have you tried stdout.sync = true ?

>
> Yep. Dosen't work either. Thanks though. Boy is this frustrating.
> There must be a simple way to do this.

Hmm... Well I only have a bunch of questions then :)

What platform are you running on? What ruby version? Is this
a standalone script, or is it called from some other process (such
as a CGI script called by Apache)?

Do you eventually see any of your printouts at all? That is, if
a linefeed is eventually printed, do all the "buffered" prints
eventually show up?

Also, in:

> # THIS WON'T THIS PRINT!!!!!!!!!!!
> print "\ca{source_file_io.pos}KB/#{@source_size}KB"

Do you really want a control-A? And is the sharp sign really
ommitted there before the open brace at \ca{ ?


Regards,

Bill

[Gregory Millam]

Received: Fri, 14 Nov 2003 10:30:45 +0900
And lo T. wrote:

> > (snip)
> > source_file_io.write(incoming)
> > # THIS WON'T THIS PRINT!!!!!!!!!!!
> > print "\ca{source_file_io.pos}KB/#{@source_size}KB"

STDOUT.flush

> > end
> > rescue
> > (/snip)

[Gavin Sinclair]

On Friday, November 14, 2003, 12:05:16 PM, T. wrote:

> no one responded to this and i still can't get it to work. please help. let me rephrase very simply:

> downloading file with open_uri and can't flush print to report download progress.

>> [snip]

>> # THIS WON'T THIS PRINT!!!!!!!!!!!
>> print "\ca{source_file_io.pos}KB/#{@source_size}KB"

I doubt it has anything to do with open-uri. Try STDOUT.flush after
the print.

BTW, what does print "\ca{source_file_io.pos}" achieve? Specifically,
the "\ca".

Gavin

[T. Onoma]

> From: "T. Onoma" <transami@runbox.com>

> What platform are you running on? What ruby version? Is this
> a standalone script, or is it called from some other process (such
> as a CGI script called by Apache)?

linux, 1.8, standalone

> Do you eventually see any of your printouts at all? That is, if
> a linefeed is eventually printed, do all the "buffered" prints
> eventually show up?

when the while loop finishes it all comes flying out. have tried flush on stdout and file's io.

> Also, in:

> > # THIS WON'T THIS PRINT!!!!!!!!!!!
> > print "\ca{source_file_io.pos}KB/#{@source_size}KB"

>
> Do you really want a control-A? And is the sharp sign really
> ommitted there before the open brace at \ca{ ?

typo, ctrl-a i had hoped would move to beginning of line, but can't test obviously. i have since replaced this line with a call to Ruby/ProgressBar from RAA. but it still the same problem.

thanks,
-t0

[nobu.nokada@softhome.net]

Hi,

At Fri, 14 Nov 2003 11:01:56 +0900,
Gavin Sinclair wrote:

> BTW, what does print "\ca{source_file_io.pos}" achieve? Specifically,
> the "\ca".

"\c" means Control key modifier, that is "\ca" is equivalent to
"\001".

$ ruby -e 'print "\ca"'|od -tx1
0000000 01
0000001

--
Nobu Nakada