I'm running Ruby installed from RubyInstaller. Here's the version:
C:\Users\Sathya>ruby -v
ruby 1.9.2p290 (2011-07-09) [i386-mingw32]
Here's the exact code, which is throwing the error:
hashtime = Hash.new(Time.mktime('1970'))
hashtime[1] = Time.now
=> 2011-10-04 19:26:53 +0530
print hashtime
{1=>2011-10-04 19:26:53 +0530}=> nil
hashtime[1] = Time.now
=> 2011-10-04 19:27:20 +0530
print hashtime
{1=>2011-10-04 19:27:20 +0530}=> nil
File.open('timehash','w') do |f|
f.write Marshal.dump(hashtime)
end
=> 56
Now, trying to load it.
Marshal.load (File.read('timehash'))
Gives the error:
ArgumentError: dump format error for symbol(0x42)
from (irb):10:in `load'
from (irb):10
from C:/Ruby192/bin/irb:12:in `<main>'
Why is this throwing an error? Am I doing something wrong, or is this a bug?
I'm running on Windows 7 Ultimate, 64-bit
Here's the results from the edited debug code you had mentioned:
hashtime = Hash.new
=> {}
hashtime[1] = Time.now
=> 2011-10-04 20:49:52 +0530
hashdump = Marshal.dump(hashtime)
=> "\x04\b{\x06i\x06Iu:\tTime\r\x8F\xE4\e\x80<\xADGO\x06:\voffseti\x02XM"
hashtime = Marshal.load (hashdump)
=> {1=>2011-10-04 20:49:52 +0530}
print hashtime
{1=>2011-10-04 20:49:52 +0530}=> nil
Results to Edit 2:
hashtime = Hash.new
=> {}
hashtime[1] = Time.now
=> 2011-10-04 21:04:24 +0530
hashdump = Marshal.dump(hashtime)
=> "\x04\b{\x06i\x06Iu:\tTime\r\x8F\xE4\e\x80\x92o\x8C\x89\x06:\voffseti\x02XM"
print "hashdump: #{hashdump}"
ÅS?ÇÆoîë?:?offseti?XM=> nile
File.open('timehash','w') do |f|
f.write hashdump
end
=> 36
hashdump2 = File.read('timehash')
=> "\x04\b{\x06i\x06Iu:\tTime\n\x8F\xE4\e\x80\x92o\x8C\x89\x06:\voffseti\x02XM"
print "hashdump2: #{hashdump2}"
hashdump2:{?i?Iu: Time
ÅS?ÇÆoîë?:?offseti?XM=> nil
hashtime2 = Marshal.load (hashdump2)
ArgumentError: dump format error for symbol(0x8c)
from (irb):73:in `load'
from (irb):73
from C:/Ruby192/bin/irb:12:in `<main>'
Some of the characters didn't come out, here's a screenshot:
Now I'm getting a time format different error
hashtime = Hash.new
=> {}
hashtime[1] = Time.now
=> 2011-10-04 21:23:15 +0530
hashdump = Marshal.dump(hashtime)
=> "\x04\b{\x06i\x06Iu:\tTime\r\x8F\xE4\e\x80\xB9\xE1\xFB\xD4\x06:\voffseti\x02X
M"
print "hashdump: #{hashdump}"
ÅΣ←Ç╣ß√╘♠:♂offseti☻XM=> nile
File.open('timehash','wb') do |f|
f.write hashdump
end
=> 36
hashdump2 = File.read('timehash')
=> "\x04\b{\x06i\x06Iu:\tTime\n\x8F\xE4\e\x80\xB9\xE1\xFB\xD4\x06:\voffseti\x02X
M"
print "hashdump2: #{hashdump2}"
hashdump2:{♠i♠Iu: Time
ÅΣ←Ç╣ß√╘♠:♂offseti☻XM=> nil
hashtime2 = Marshal.load (hashdump2)
TypeError: marshaled time format differ
from (irb):10:in `_load'
from (irb):10:in `load'
from (irb):10
from C:/Ruby192/bin/irb:12:in `<main>'
You need to write to the file in binary mode by appending a b
to the file mode:
File.open('timehash','wb') do |f|
f.write Marshal.dump(hashtime)
end
You can see this is the issue by comparing the strings (from our debugging) before writing to disk vs after reading back in:
=> "\x04\b{\x06i\x06Iu:\tTime\r\x8F\xE4\e\x80\x92o\x8C\x89\x06:\voffseti\x02XM"
=> "\x04\b{\x06i\x06Iu:\tTime\n\x8F\xE4\e\x80\x92o\x8C\x89\x06:\voffseti\x02XM"
^^
a \r
(carriage return) is being changed to a \n
(newline)
However, it seems like even with the binary modifier your system is not obeying you and is changing \r
to \n
... So let's try encoding the data to base64:
File.open('timehash','w') do |f|
hashtime_marshal = Marshal.dump(hashtime)
f.write [hashtime_marshal].pack("m")
end
hashtime_encoded = File.read('timehash')
hashtime = Marshal.load( hashtime_encoded.unpack("m")[0] )
Let me know if that works?
Old Information:
Don't pass anything to Hash.new
:
>> hashtime = Hash.new
=> {}
>> hashtime[1] = Time.now
=> Tue Oct 04 10:57:49 -0400 2011
>> hashtime
=> {1=>Tue Oct 04 10:57:49 -0400 2011}
>> File.open('timehash','w') do |f|
?> f.write Marshal.dump(hashtime)
>> end
=> 22
>> Marshal.load (File.read('timehash'))
(irb):10: warning: don't put space before argument parentheses
=> {1=>Tue Oct 04 10:57:49 -0400 2011}
The documentation states that the obj
parameter to Hash.new
is the default value... it should work as you have it... I don't know why it doesn't... but in your case nil
is an acceptable default, just check to see if values are nil
and if so, use a Time.mktime('1970')
for them instead.
EDIT: That solved the problem for me, however, I'm on OS X not Windows. So, let's try a bit of debugging. What happens when you run the following code?
hashtime = Hash.new
hashtime[1] = Time.now
hashdump = Marshal.dump(hashtime)
hashtime = Marshal.load (hashdump)
print hashtime
EDIT #2: OK. So Marshal.dump
and Marshal.load
seem to work. Looks like it's something with the file I/O... Please post the results of the following code...
hashtime = Hash.new
hashtime[1] = Time.now
hashdump = Marshal.dump(hashtime)
print "hashdump: #{hashdump}"
File.open('timehash','w') do |f|
f.write hashdump
end
hashdump2 = File.read('timehash')
print "hashdump2: #{hashdump2}"
hashtime2 = Marshal.load (hashdump2)
print hashtime2
Instead of reading with File.read
try File.binread
or File.open('timehash', 'rb')
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