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Re: Windows IDL DLM with Cygwin [message #44784 is a reply to message #44720]

Wed, 13 July 2005 15:04

Mark Hadfield
Messages: 783
Registered: May 1995

Senior Member

joey@swri.edu wrote:
> Is there a good reference on the difference between DLM and CALL_EXTERNAL?
> Someone told us to make a DLM and we did so I never researched the possibility
> of doing a CALL_EXTERNAL. Possibly I could convert my code from DLM to a
> CALL_EXTERNAL to keep the Windows people happy?

Read RSI's "External Development Guide". You should be able to find it
somewhere in the help system.

I have personal experience only with DLLs that are to be called via
CALL_EXTERNAL. This technique is described in the EDG under "Techniques
that don't use IDL's Internal API". It is reasonably easy to construct
such DLLs. The pitfall is that the information passed to and from the
DLL is not checked so:

- You will need to write an IDL wrapper program that knows the
data types to be passed and does the checking.

- If you get it wrong, IDL crashes.

It takes more work to write a DLM (Dynamically Loadable Modules) but its
integration into IDL is much better.

--
Mark Hadfield "Kei puwaha te tai nei, Hoea tahi tatou"
m.hadfield@niwa.co.nz
National Institute for Water and Atmospheric Research (NIWA)

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[Message index]

		Windows IDL DLM with Cygwin By: joeymu on Mon, 11 July 2005 16:02
		Re: Windows IDL DLM with Cygwin By: Mark Hadfield on Wed, 13 July 2005 15:04
		Re: Windows IDL DLM with Cygwin By: joey on Wed, 13 July 2005 07:24
		Re: Windows IDL DLM with Cygwin By: Haje Korth on Wed, 13 July 2005 07:42
		Re: window By: David Fanning on Thu, 03 November 2005 15:04
		Re: window By: Mark Hadfield on Thu, 03 November 2005 11:08
		Re: window By: ChiChiRuiz@gmail.com on Thu, 03 November 2005 07:57
		Re: window By: ChiChiRuiz@gmail.com on Thu, 03 November 2005 06:55
		Re: window By: David Fanning on Wed, 02 November 2005 22:57
		Re: window By: David Fanning on Wed, 02 November 2005 22:48
		Re: window By: David Fanning on Wed, 02 November 2005 22:47
		Re: window By: Kenneth P. Bowman on Wed, 02 November 2005 18:37
		Re: window By: Ken Mankoff on Wed, 02 November 2005 15:45

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