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Re: Need help with basic spawn command [message #54069 is a reply to message #54066]

Thu, 17 May 2007 01:45

yi.selab
Messages: 9
Registered: July 2006

Junior Member

IDL's spawn procedure can't get the return value from C program.
Of course, you can get the result using second argument like this :

IDL> spawn, 'basic', result

In this case, the result variable is not the return value of main
function(C Program)
but the output text result of the 'basic' command in Shell(Unix) or
Command Prompt(MS Windows)

The 'result' variable is string array, so it can catch multi lines
text output.

Anyway, if you want to use spawn procedure, the C program should be
modified.

I expect that you can get result if you insert,

printf("%d", n);

into your C code.

On 5월17일, 오전7시34분, ryans...@gmail.com wrote:
> Im running IDL on XP.
>
> I have this basic C code:
>
> #include <stdlib.h>
>
> int main()
> {
>
> int n=5;
> n=n*2;
> return n;}
>
> //This file is basic.c
>
>> From IDL, I just want to call this program and return n.
>
> In IDL, I can write:
>
> SPAWN, 'basic' ; this of course runs the
> basic.c program.
>
> But this doesnt return anythingof course.. ive tried to add another
> variable after this line such as:
> SPAWN, 'basic', variable
>
> But windows doesnt like any of this...
>
> Can anyone help me with this basic application? With spawn in the past
> ive gotten it to do calculations on a variable and return them, but
> with no input, im unsure how to get the output.
>
> Thanks for any help! Ive also boughten the 'from c->dlm->idl' book but
> it wont be in for a few days.

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[Message index]

		Re: Need help with basic spawn command By: ryanselk on Thu, 17 May 2007 08:32
		Re: Need help with basic spawn command By: James Kuyper on Thu, 17 May 2007 08:12
		Re: Need help with basic spawn command By: Vince Hradil on Thu, 17 May 2007 07:02
		Re: Need help with basic spawn command By: yp on Thu, 17 May 2007 05:46
		Re: Need help with basic spawn command By: Allan Whiteford on Thu, 17 May 2007 04:14
		Re: Need help with basic spawn command By: yi.selab on Thu, 17 May 2007 01:45
		Re: Need help with basic spawn command By: Trae on Tue, 22 May 2007 05:55

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