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Re: call_external [message #12440 is a reply to message #1268]

Wed, 05 August 1998 00:00

Vap User
Messages: 31
Registered: April 1998

Member

Chris Varekamp <chris.varekamp@users.whh.wau.nl> writes:

The entry point is the name of the C function in the source file.

The function ...

float foo ( int argc, char *argv[] ) {
/* your code here */
return (result);
}

within the file 'foo.c' would be called in the following manner using
call_external.

result = call_external( 'c:\path\to\shareable\library\foo.ddl','foo',arg1,...)

I may have made a mistake about the naming convention of the 'image'
(i.e. the library/ddl file) since I work with Unices and don't really
know the nomenclature for NT boxes, but I think a DDL is the
equivalent of a Unix shareable library on a windoze machine.

In any case, the 'entry' is just the name of the C function. It's
called an entry point because you can have more than one function in
the same shareable image, hence the loader must know at which point to
'enter' the file.

>
> Hello,
>
> Does anyone have experience running a C program using the CALL_EXTERNAL
> function in IDL on an NT machine? Are there examples around ?
>
> I have a small program from numerical recipes that returns a float.
> However, the CALL_EXTERNAL function requires you to specify an entry
> point (don't know what is meant by this).
>
> Hope someone can give me a hint...
>
> Chris Varekamp
> Dept. Water Resources
> Wageningen University
> The Netherlands

--
I don't speak for JPL, it doesn't speak for me.
Well, not all the time, at least.
William Daffer <vapuser@haifung.jpl.nasa.gov>

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[Message index]

		CALL_EXTERNAL By: dean on Wed, 18 August 1993 09:38
		Re: Call_external By: Inigo Garcia on Thu, 12 June 1997 00:00
		Re: call_external By: Vap User on Wed, 05 August 1998 00:00
		Re: call_external By: rivers on Wed, 12 August 1998 00:00
		Re: CALL_EXTERNAL By: menakkis on Mon, 22 February 1999 00:00
		Re: CALL_EXTERNAL By: ashmall on Wed, 03 March 1999 00:00
		Re: CALL_EXTERNAL By: Nigel Wade on Mon, 22 July 2002 01:44
		Re: CALL_EXTERNAL By: ronn on Sat, 20 July 2002 06:25
		Re: CALL_EXTERNAL By: Craig Markwardt on Fri, 19 July 2002 15:00
		Re: CALL_EXTERNAL By: zaygula on Wed, 31 July 2002 07:35
		Re: CALL_EXTERNAL By: Mark Rivers on Tue, 30 July 2002 19:26
		Re: CALL_EXTERNAL By: Randall Skelton on Wed, 05 February 2003 00:47
		Re: Call_external By: Karl Schultz on Wed, 10 March 2004 11:02
		Re: Call_external By: Haje Korth on Wed, 10 March 2004 09:20
		Re: Call_external By: Dr Paul Ducksbury on Wed, 10 March 2004 06:39
		Re: Call_external By: scuaic on Thu, 11 March 2004 14:32
		Re: Call_external By: Haje Korth on Wed, 10 March 2004 05:11
		Re: Call_external By: Pepijn Kenter on Wed, 10 March 2004 05:19
		Re: Call_external By: Dr Paul Ducksbury on Wed, 10 March 2004 05:02
		Re: call_external By: Haje Korth on Sun, 17 February 2013 05:53
		Re: call_external By: Katerina Yakimenko on Thu, 07 March 2013 05:55
		Re: call_external By: David Fanning on Thu, 07 March 2013 06:42
		Re: call_external By: Katerina Yakimenko on Thu, 07 March 2013 06:23
		Re: call_external By: David Fanning on Thu, 07 March 2013 06:10

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