From: Shea Martin <shea08@...>
Date: 2007-03-22T09:05:51+09:00
Subject: Re: traverse windows registry

Yeah,

I notices that it would be dead simple to make it work.  Just add 
TypeError to the rescue clause.  But I like to write portable code that 
doesn't depend on changing standard libs.

I would say that this is a design flaw though, of the win32/registry.rb 
code.  It makes it unusable for iteration, as it is inevitable that one 
will come across a REG_NONE at some point.

I ended up just copying the each_value function, and making my own 
global version with took a registry entry as a parameter.

~S

Jeremy wrote:
>  From looking at the source the read bit should already be in a 
> begin/rescue so it might be worth checking you have the latest version 
> of ruby and the win32 stuff? I think that the problem is actually in the 
> read method of registry.rb, doesn't seem to handle REG_NONE. You could 
> change this method to make it work. Here's the original:
> 
>    def read(name, *rtype)
>      type, data = API.QueryValue(@hkey, name)
>      unless rtype.empty? or rtype.include?(type)
>        raise TypeError, "Type mismatch (expect #{rtype.inspect} but 
> #{type} present)"
>      end
>      case type
>      when REG_SZ, REG_EXPAND_SZ
>        [ type, data.chop ]
>      when REG_MULTI_SZ
>        [ type, data.split(/\0/) ]
>      when REG_BINARY
>        [ type, data ]
>      when REG_DWORD
>        [ type, API.unpackdw(data) ]
>      when REG_DWORD_BIG_ENDIAN
>        [ type, data.unpack('N')[0] ]
>      when REG_QWORD
>        [ type, API.unpackqw(data) ]
>      else
>        raise TypeError, "Type #{type} is not supported."
>      end
>    end
> 
> 
> Shea Martin wrote:
>> Shea Martin wrote:
>>> Is there an example of traversing the window registry?  I can't seem 
>>> to find any documentation on Win32::Registry.  The ruby install came 
>>> with some docs for Windows::Registry, but that seems to be a 
>>> different animal...
>>>
>>> THanks,
>>> ~S
>>
>>
>> I have traversal code working. Just simple recursion.  But I am having 
>> trouble looping over values.  An exception is thrown whenever a value 
>> of type REG_NONE is found.  This prevents me from iterating over other 
>> values, due to the exception.  Even if I rescue the exception, I am 
>> still kicked out of the each_value loop.
>>
>> The problem is that each_value does a read, and read throws the 
>> exception if the type is REG_NONE.  see win32/registry.rb line 633.
>>
>> Is there anyway around this?
>>
>> Thanks,
>> ~S
>>
>