From: Nicholas Van Weerdenburg <vanweerd@...>
Date: 2005-01-09T13:19:52+09:00
Subject: Re: "Parameter not optional" error using WIN32OLE

Have you tried directly using win32ole instead of the generated
wrapper? What of using 0 instead of nil? Or just leaving it out when
using the named parameters?


On Thu, 6 Jan 2005 07:11:31 +0900, Dino <dino@notmyrealaddress.com> wrote:
> Perhaps someone has run into this problem before me and can offer a solution.
> 
> I am attempting to use an OLE automation server through Ruby.  I am calling a function on an automation object, and that function, according to the documentation, can accept a "NULL reference" instead of an object of the desired type.  For my application, the NULL value is the correct one.  So I am making this call:
> 
> notification.Wait(nil, 10.0, nil, false, result)
> 
> By the way, the interface I am using was generated by olegen.rb; props to Masaki Suketa for this very useful utility.
> 
> Anyway, I have also tried this with a more direct call that looks like this (the comments are copied out from my code):
> 
>    notification.Wait({
>                    "destinationPropObj" => nil,        # data reference; pass nil if you don't want the data
>                    "timeoutInSeconds"   => 10.0,             # timeout in seconds; pass negative for infinite timeout
>                    "sequenceContextObj" => nil,         # sequence context, used to improve blocking behavior for the sequence calling this function (nil if you are not calling from a sequence execution)
>                    "processMsgs"        => false,            # process Windows messages while waiting?  Use true when calling from a sequence, false otherwise
>                    "waitRes"            => result            # result of the Wait call
>                   }
>                  )
> 
> These are only two out of many ways to make this OLE method call in WIN32OLE; I have tried a few others as well.
> 
> The problem is that 'nil' is never accepted by WIN32OLE.  I always get the following error when trying to pass 'nil' for any argument:
> 
>     OLE error code:0 in <Unknown>
>       <No Description>
>     HRESULT error code:0x8002000f
>       Parameter not optional.   from <my ruby file>
> 
> Now, I'm pretty sure at this point that the WIN32OLE library isn't even the entity creating this error, but rather the OLE functionality itself.
> 
> At any rate, I am hoping someone might have run into this problem before and be able to help me out.  I investigated it extensively over the past few days and just can't find the solution myself.
> 
> Thanks for any and all help,
> --Dino
> 
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> 


-- 
Nicholas Van Weerdenburg