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External Development: Number of arguments [message #93426]

Tue, 12 July 2016 13:37

Haje Korth
Messages: 651
Registered: May 1997

Senior Member

I am cooking on another DLM. I need to check for the number of parameters passed into the routine but need to distinguish between regular arguments and keywords. The argc argument gives me the total but I do not know how to subtract the keyword count. There must be a simpler way of checking every single keyword as to whether it is supplied or not. Help greatly appreciated.

Thanks,
Haje

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Re: External Development: Number of arguments [message #93427 is a reply to message #93426]

Tue, 12 July 2016 17:11

Jim Pendleton
Messages: 165
Registered: November 2011

Senior Member

On Tuesday, July 12, 2016 at 2:37:48 PM UTC-6, Haje Korth wrote:
> I am cooking on another DLM. I need to check for the number of parameters passed into the routine but need to distinguish between regular arguments and keywords. The argc argument gives me the total but I do not know how to subtract the keyword count. There must be a simpler way of checking every single keyword as to whether it is supplied or not. Help greatly appreciated.
>
> Thanks,
> Haje

See the docs for the internal C function IDL_KWProcessByOffset.

Here's an example from the EDG:

http://www.harrisgeospatial.com/docs/KWExamples.html

Jim P.

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Re: External Development: Number of arguments [message #93428 is a reply to message #93426]

Wed, 13 July 2016 01:34

Markus Schmassmann
Messages: 129
Registered: April 2016

Senior Member

On 07/12/2016 10:37 PM, Haje Korth wrote:
> I am cooking on another DLM. I need to check for the number of
> parameters passed into the routine but need to distinguish between
> regular arguments and keywords. The argc argument gives me the total
> but I do not know how to subtract the keyword count. There must be a
> simpler way of checking every single keyword as to whether it is
> supplied or not. Help greatly appreciated.
consider using a wrapper which passes of the return of n_params()

That is maybe not optimal, but easy to do.

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Re: External Development: Number of arguments [message #93431 is a reply to message #93426]

Wed, 13 July 2016 12:04

Haje Korth
Messages: 651
Registered: May 1997

Senior Member

On Tuesday, July 12, 2016 at 4:37:48 PM UTC-4, Haje Korth wrote:
> I am cooking on another DLM. I need to check for the number of parameters passed into the routine but need to distinguish between regular arguments and keywords. The argc argument gives me the total but I do not know how to subtract the keyword count. There must be a simpler way of checking every single keyword as to whether it is supplied or not. Help greatly appreciated.
>
> Thanks,
> Haje

Thank you for your replies. I had studied the IDL_KWProcessByOffset documentation and could not immediately retrieve the number of keyword using the function. I now simply add the nkw=sum(kw.there) flag, which are set to one if the keyword is set. Then I compute argc-nkw to get at the number of regular arguments.

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