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Re: SPAWN [message #8669 is a reply to message #7751]

Wed, 09 April 1997 00:00

thompson
Messages: 584
Registered: August 1991

Senior Member

Nobuyuki Tasaka <tasaka@mr.med.ge.com> writes:

> Hi all,

> If someone who have tried to compare SPAWN in the following
> usage, please let me know the difference in terms of data
> parsing speed, interface flexibility and routine's independency.

> I would like to use SPAWN for calling database retriving routine
> written in C.

> 1) SPAWN, "cmd", result

> 2) SPAWN, "cmd", /UNIT

This is not a correct usage. The UNIT keyword returns a logical unit number
which can be used to communicate with the spawned process using read and write
commands (via a bi-directional pipe). Thus, one would want to use this with
the syntax:

SPAWN, "cmd", UNIT=UNIT

When one is done, then one can use

FREE_LUN, UNIT

to close the logical unit, since the SPAWN did an implicit GET_LUN.

I've never used this myself, but I would guess that the spawned program would
communicate with IDL using standard input and output.

Another option you haven't discussed is the use of the /NOSHELL keyword with
SPAWN. This is supposed to speed it up.

Bill

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[Message index]

		SPAWN and reading from a socket? By: alpha on Thu, 16 January 1997 00:00
		Re: SPAWN and reading from a socket? By: alpha on Fri, 17 January 1997 00:00
		Re: SPAWN and reading from a socket? By: plugge on Fri, 17 January 1997 00:00
		Re: SPAWN By: Tim Patterson on Wed, 09 April 1997 00:00
		Re: SPAWN By: thompson on Wed, 09 April 1997 00:00
		Re: SPAWN By: Nobuyuki Tasaka on Wed, 09 April 1997 00:00
		Re: SPAWN By: Tim Patterson on Tue, 08 April 1997 00:00

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