Can't flush print when download open-uri

ruby-talk
1

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

2

Hi,

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

···

From: “T. Onoma” transami@runbox.com

 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

3

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

···

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"
4

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