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To:	cygwin AT sourceware DOT cygnus DOT com
cc:	roland AT PDF DOT COM
Subject:	Excel DLLs
Date:	Tue, 07 Mar 2000 08:46:55 -0800
From:	Roland Ruehl <roland AT PDF DOT COM>

Hello,

I am building DLLs with CYGWIN B20.1 for linkage with Excel and Visual
Basic. I started from Mumit's dll examples and am getting into more
complex coding now. I have a few questions and was wondering if anybody had 
experience or could refer me to further documentation:

- Does anybody know about detailed documentation for passing parameters
	from Visual basic to Cygwin ? For instance, by trial and error,
	I found out that Strings are passed as pointers to C arrays of
	shorts, but am wondering about more complex structures, i.e.
	records, arrays, etc. How do I pass an unknown number of
	parameters, similar to the Excel SUM() construct, for example ?

- I am able to do basic unbuffered IO in the DLL (open/read/write)
	but failed to do more complex stuff, like opening
	a socket, a pipe or do buffered IO. Is that possible, and
	if yes how ?

Thank you in advance for any help you can provide,

	Roland Ruehl.
	PDF Solutions, Inc.


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