From: Joel VanderWerf <vjoel@...>
Date: 2008-05-20T15:22:36+09:00
Subject: Re: how to serialize hash to a file?

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}

-- 
       vjoel : Joel VanderWerf : path berkeley edu : 510 665 3407