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POPython: parse VARIANT (?)
 

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  1. POPython: parse VARIANT (?)
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    <p>I have to read a file in python that uses <a href="http://msdn.microsoft.com/en-us/library/windows/desktop/aa380072%28v=vs.85%29.aspx" rel="nofollow">Microsoft <code>VARIANT</code></a> (I think - I really don't know much about Microsoft code :S). <strong>Basically I want to know if there are python packages that can do this for me.</strong></p> <p>To explain - the file I'm trying to read is just a whole bunch of <code>{ 2-byte integer, &lt;data&gt; }</code> repeated over and over, where the 2-byte integer specifies what the <code>&lt;data&gt;</code> is.</p> <p>The 2-byte integer corresponds to the Microsoft data types in VARIANT: <code>VT_I2</code>, <code>VT_I4</code>, etc, and based on the type I can write code to read in and coerce <code>&lt;data&gt;</code> to an appropriate Python object.</p> <p>My current attempt is along the following lines:</p> <pre><code>while dtype = file.read(2): value = None # translate dtype (I've put in VT_XX myself to match up with Microsoft) if dtype == VT_I2: value = file.read(2) elif dtype == VT_I4: value = file.read(4) # ... and so on for other types # append value to the list of values # return the values we read return values </code></pre> <p>The thing is, I'm having trouble working out how to convert some of the bytes to the appropriate Python object (for example <code>VT_BSTR</code>, <code>VT_DECIMAL</code>, <code>VT_DATE</code>). However before I try further, I'd like to know <strong>if there are any existing python packages that do this logic for me (i.e. take in a file object/bytes and parse it into a set of python objects, be they float, int, dates, strings, ...).</strong></p> <p>It just seems like this is a fairly common thing to do. However, I've been having difficulty looking for packages to do it because not knowing anything about Microsoft code, I don't have the terminology to do the appropriate googling. (<strong>If it is relevant, I am running LINUX</strong>).</p>
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    1. USmathematical.coffee
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    1. COI'm assuming this is meant to be pseudocode, since `while dtype = file.read(2)` is not legal python.
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      1. POPython: parse VARIANT (?)
      1. USJoel Cornett
    2. COHave you tried hachoir (https://bitbucket.org/haypo/hachoir/wiki/Home)? Works on linux and has support for some MS file types. Might be worth a look in case your particular format is covered.
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      1. USazhrei
    3. CO[OleFileIO_PL](http://www.decalage.info/python/olefileio)
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      1. USephemient
 

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