From: Robert Klemme <shortcutter@...>
Date: 2008-05-20T16:23:01+09:00
Subject: Re: how to serialize hash to a file?

2008/5/20 Joel VanderWerf <vjoel@path.berkeley.edu>:
> hurcan solter wrote:
>>
>> i have an xml file that goes like;
>>
>> <objectClass name="EmitterBeam" >
>> <attribute name="BeamElevationCenter" dataType="Float1"/>
>> <attribute name="BeamIdentifier" dataType="HLAoctet"/>
>> </objectClass>
>>
>> at some point i need the look up the data type for different
>> attributes.
>> I can get the data type using a Xpath query in the form using REXML
>>
>> node = $fom_file.elements["//attribute [@name = '#{attribute_name}']"]
>>
>> it works okay, the thing is ,it takes ages (which is about ten
>> seconds)
>>
>> so I have a mind to cache the attribute-datatype pairs in a hash for
>> faster lookup.
>> So can you guys tell me a simple and elegant way to do serialize
>> deserialize that hash to a file?
>> TIA
>> Hurcan Solter
>
> Pretty easy...
>
> h = {1=>2, 3=>4}
> File.open("foo", "wb") {|f| Marshal.dump(h, f)}
> p File.open("foo", "rb") {|f| Marshal.load(f)} # ==> {1=>2, 3=>4}

Amazing how we nearly picked the same solution - even the file name is
identical. :-)

Cheers

robert


-- 
use.inject do |as, often| as.you_can - without end