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Re: Pros & cons of methods 1) DLM and 2) Call_External of calling C from IDL [message #93480 is a reply to message #93477]

Mon, 01 August 2016 06:32

Michael Galloy
Messages: 1114
Registered: April 2006

Senior Member

On 7/31/16 3:09 PM, neil.a.salmon@gmail.com wrote:
> Could anyone please summarize the pros and cons of using the two
> different methods 1) DLM and 2) Call_External of calling C routines
> from IDL. I'm using IDL Version 6.0. Many thanks, neil

If you go with CALL_EXTERNAL, I would recommend an IDL wrapper routine
that checks the arguments. The wrapper routine can accept keywords and
hide the C/Fortran style API of the external call.

CALL_EXTERNAL

Pros:
- fairly easy
- doesn't require an C coding or knowing the IDL C API

Cons:
- ugly, brittle call
- no keywords
- C/Fortran style API, not a typical IDL calling style

DLM

Pros:
- can make a native style routine (this is how IDL is extended by
Harris engineers)
- access to IDL C API: keywords, data checking macros, variable
number of parameters, etc.

Cons:
- requires knowledge of C and the IDL C API (significant learning curve)
- requires a fair amount of C boilerplate code

Mike
--
Michael Galloy
www.michaelgalloy.com
Modern IDL: A Guide to IDL Programming (http://modernidl.idldev.com)

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[Message index]

		Pros & cons of methods 1) DLM and 2) Call_External of calling C from IDL By: neil salmon on Sun, 31 July 2016 14:09
		Re: Pros & cons of methods 1) DLM and 2) Call_External of calling C from IDL By: Michael Galloy on Mon, 01 August 2016 06:32
		Re: Pros & cons of methods 1) DLM and 2) Call_External of calling C from IDL By: neil salmon on Mon, 01 August 2016 12:15
		Re: Pros & cons of methods 1) DLM and 2) Call_External of calling C from IDL By: Michael Galloy on Tue, 02 August 2016 15:25
		Re: Pros & cons of methods 1) DLM and 2) Call_External of calling C from IDL By: neil salmon on Wed, 03 August 2016 04:21
		Re: Pros & cons of methods 1) DLM and 2) Call_External of calling C from IDL By: Michael Galloy on Wed, 03 August 2016 06:19
		Re: Pros & cons of methods 1) DLM and 2) Call_External of calling C from IDL By: natha on Wed, 03 August 2016 10:23
		Re: Pros & cons of methods 1) DLM and 2) Call_External of calling C from IDL By: neil salmon on Thu, 04 August 2016 06:23
		Re: Pros & cons of methods 1) DLM and 2) Call_External of calling C from IDL By: Helder Marchetto on Thu, 04 August 2016 06:41
		Re: Pros & cons of methods 1) DLM and 2) Call_External of calling C from IDL By: Michael Galloy on Thu, 04 August 2016 16:11
		Re: Pros & cons of methods 1) DLM and 2) Call_External of calling C from IDL By: neil salmon on Fri, 05 August 2016 07:08
		Re: Pros & cons of methods 1) DLM and 2) Call_External of calling C from IDL By: neil salmon on Mon, 08 August 2016 00:42
		Re: Pros & cons of methods 1) DLM and 2) Call_External of calling C from IDL By: Michael Galloy on Mon, 08 August 2016 10:14
		Re: Pros & cons of methods 1) DLM and 2) Call_External of calling C from IDL By: neil salmon on Mon, 08 August 2016 14:41
		Re: Pros & cons of methods 1) DLM and 2) Call_External of calling C from IDL By: Helder Marchetto on Mon, 08 August 2016 14:48
		Re: Pros & cons of methods 1) DLM and 2) Call_External of calling C from IDL By: neil salmon on Tue, 09 August 2016 03:26
		Re: Pros & cons of methods 1) DLM and 2) Call_External of calling C from IDL By: neil salmon on Wed, 10 August 2016 03:31
		Re: Pros & cons of methods 1) DLM and 2) Call_External of calling C from IDL By: Michael Galloy on Wed, 10 August 2016 07:44
		Re: Pros & cons of methods 1) DLM and 2) Call_External of calling C from IDL By: neil salmon on Wed, 10 August 2016 09:31
		Re: Pros & cons of methods 1) DLM and 2) Call_External of calling C from IDL By: neil salmon on Wed, 10 August 2016 11:20
		Re: Pros & cons of methods 1) DLM and 2) Call_External of calling C from IDL By: Haje Korth on Thu, 11 August 2016 04:26
		Re: Pros & cons of methods 1) DLM and 2) Call_External of calling C from IDL By: neil salmon on Thu, 11 August 2016 05:32
		Re: Pros & cons of methods 1) DLM and 2) Call_External of calling C from IDL By: Haje Korth on Fri, 12 August 2016 05:31
		Re: Pros & cons of methods 1) DLM and 2) Call_External of calling C from IDL By: neil salmon on Thu, 11 August 2016 07:39
		Re: Pros & cons of methods 1) DLM and 2) Call_External of calling C from IDL By: neil salmon on Sun, 14 August 2016 12:35

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