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From: "Rafael Kitover" <caelum AT debian DOT org>
To: <cygwin AT cygwin DOT com>
Subject: RE: C COM objects?
Date: Thu, 29 Jan 2004 20:25:07 -0800
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Hi Michael, I remembered your sig from a Slashdot article :)

If COM and OLE are similar beasties, I think you mean -fvtable-thunks. GCC 2.95
required -fvtable-thunks to build OLE stuff, like the Win32::OLE module in the
perl-libwin32 package, but since GCC 3.x it works fine as it is, and that
option no longer exists.

It seems most of the OLE/COM stuff should work more or less fine in Cygwin with
a bit of tweaking.

Now, if only we could get a Cygwin version of tchar.h... I guess I could write
one :)

-- 
Rafael

>-----Original Message-----
>From: cygwin-owner AT cygwin DOT com [mailto:cygwin-owner AT cygwin DOT com] On Behalf Of
>Michael D. Crawford
>Sent: Thursday, January 29, 2004 5:29 PM
>To: cygwin AT cygwin DOT com
>Subject: Re: C COM objects?
>
>I tried a couple of times to get ZooLib (http://www.zoolib.org/) to build with
>Cygwin.  ZooLib is a cross-platform application framework, and on Windows uses
>COM to handle the clipboard and drag and drop.
>
>I believe that actually you CAN get COM to work with gcc, even from C++, but
>you're going to need to build gcc and its libraries a different way than the
>way
>it's normally built by the Cygwin developers.  I'm afraid I don't remember
>what
>is needed, but it has something to do with vtable thunking.  You need to set
>whatever option deals with that differently than the way it's built normally
>by
>the cygwin folks.
>
>I'm sorry I can't be more specific, but it's been a while.  Maybe if you
>search
>for my email address or the word "zoolib" in the list archives you can find
>where I asked about this before.
>
>It's actually not very hard at all to do COM programming in C.  A COM
>interface
>is little more than a structure full of pointers to functions.  I have some
>sample code from when I gave a talk on writing Mac OS X user clients at
>MacHack
>last year.  Yes, Apple's Mac OS X actually uses COM!  Who would have thought.
>I've been meaning for months to post the source on my website but I got to fix
>it up before I do.  I'll go have a look and maybe I can post some snippets as
>a
>reply to this thread.
>
>Mike
>--
>Michael D. Crawford
>GoingWare Inc. - Expert Software Development and Consulting
>http://www.goingware.com
>crawford AT goingware DOT com
>
>   Tilting at Windmills for a Better Tomorrow.
>
>     "I give you this one rule of conduct. Do what you will, but speak
>      out always. Be shunned, be hated, be ridiculed, be scared,
>      be in doubt, but don't be gagged."
>      -- John J. Chapman, "Make a Bonfire of Your Reputations"
>         http://www.goingware.com/reputation/




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