# Win32ole and mci.mmcontrol failure

**URL:** <https://www.ruby-forum.com/t/win32ole-and-mci-mmcontrol-failure/51648>\
**Category:** Ruby\
**Created:** [January 5, 2006, 3:45am UTC](https://www.ruby-forum.com/t/win32ole-and-mci-mmcontrol-failure/51648 "2006-01-05T03:45:56Z")\
**Posts on this page:** 4\
**Page:** 1

<div class="post-metadata">

**Author:** ![danielb](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/c57346/32.png) [@danielb](https://www.ruby-forum.com/u/danielb)\
**Post date:** [January 5, 2006, 3:45am UTC](https://www.ruby-forum.com/t/win32ole-and-mci-mmcontrol-failure/51648/1 "2006-01-05T03:45:56Z")

</div>

Hi all,

Windows XP, SP2  
Ruby 1.8.2 and 1.8.4

Why does this fail?

irb(main):001:0\> require “win32ole”  
=\> true  
irb(main):002:0\> sound = WIN32OLE.new(“MCI.MMControl”)  
WIN32OLERuntimeError: unknown OLE server: `MCI.MMControl' HRESULT error code:0x800401f3 Invalid class string from (irb):2:in`initialize’  
from (irb):2

Thanks,

Dan

---

<div class="post-metadata">

**Author:** ![danielb](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/c57346/32.png) [@danielb](https://www.ruby-forum.com/u/danielb)\
**Post date:** [January 5, 2006, 1:42pm UTC](https://www.ruby-forum.com/t/win32ole-and-mci-mmcontrol-failure/51648/2 "2006-01-05T13:42:17Z")

</div>

> irb  
> irb(main):001:0\> require ‘win32ole’  
> =\> true  
> irb(main):002:0\> sound = WIN32OLE.new(“MCI.MMControl”)  
> =\> #WIN32OLE:0x250a230  
> irb(main):003:0\>  
> irb -v  
> irb 0.9.5(05/04/13)  
> ruby -v  
> ruby 1.8.4 (2005-12-26) [i386-cygwin]

do you have OLE/COM Object Viewer installed (I think it comes with  
Visual C++).  
if not, you can get it at,  
[http://www.microsoft.com/windows2000/techinfo/reskit/tools/existing/oleview-o.asp](http://www.microsoft.com/windows2000/techinfo/reskit/tools/existing/oleview-o.asp)  
[http://www.microsoft.com/downloads/details.aspx?FamilyID=9d467a69-57ff-4ae7-96ee-b18c4790cffd&displaylang=en](http://www.microsoft.com/downloads/details.aspx?FamilyID=9d467a69-57ff-4ae7-96ee-b18c4790cffd&displaylang=en)

Is “Microsoft MCI Control” listed under “Controls” or “Automation  
Objects” in the  
OLE/COM Object Viewer?

do you have mci32.ocx installed in System32 dir?  
is mci32.ocx in your path?  
is MCI.MMControl in your registry?

---

<div class="post-metadata">

**Author:** ![danielb](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/c57346/32.png) [@danielb](https://www.ruby-forum.com/u/danielb)\
**Post date:** [January 5, 2006, 5:44pm UTC](https://www.ruby-forum.com/t/win32ole-and-mci-mmcontrol-failure/51648/3 "2006-01-05T17:44:45Z")

</div>

i think the ocx is automatically installed with Visual C++, Visual  
Basic, and  
other Visual Studio programs, or you can find just the control here:

[http://www.ppreview.net/Forum/topic.asp?TOPIC\_ID=245](http://www.ppreview.net/Forum/topic.asp?TOPIC_ID=245)  
mci32.cab

---

<div class="post-metadata">

**Author:** ![danielb](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/c57346/32.png) [@danielb](https://www.ruby-forum.com/u/danielb)\
**Post date:** [January 5, 2006, 5:44pm UTC](https://www.ruby-forum.com/t/win32ole-and-mci-mmcontrol-failure/51648/4 "2006-01-05T17:44:31Z")

</div>

Lou V. wrote:

> do you have OLE/COM Object Viewer installed (I think it comes with Visual C++).  
> if not, you can get it at,  
> [http://www.microsoft.com/windows2000/techinfo/reskit/tools/existing/oleview-o.asp](http://www.microsoft.com/windows2000/techinfo/reskit/tools/existing/oleview-o.asp)  
> [http://www.microsoft.com/downloads/details.aspx?FamilyID=9d467a69-57ff-4ae7-96ee-b18c4790cffd&displaylang=en](http://www.microsoft.com/downloads/details.aspx?FamilyID=9d467a69-57ff-4ae7-96ee-b18c4790cffd&displaylang=en)
> 
> Is “Microsoft MCI Control” listed under “Controls” or “Automation Objects” in the  
> OLE/COM Object Viewer?

I don’t see it.

> do you have mci32.ocx installed in System32 dir?  
> is mci32.ocx in your path?  
> is MCI.MMControl in your registry?

Nope. Closest thing I’ve got is mciole32.dll. Where do you get it?  
I’m on Windows XP Pro, SP2 with the MS SDK and .NET stuff (cl 13).

Thanks,

Dan