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Re: Q: pointers inside of an array of structures? [message #21296]

Wed, 16 August 2000 00:00

Ivan Zimine
Messages: 40
Registered: February 1999

Member

Amara Graps wrote:
>
> IDL> thisstruc = {orbit:'', freq:ptr_new()}
> IDL> periodcube = replicate(thisstruc,1)
>
> ;Put values into the structure
> IDL> periodcube(0).orbit='G2'
> IDL> *periodcube(0).freq=DINDGEN(50)
> % Unable to dereference NULL pointer: <POINTER (<NullPointer>)>.
> % Execution halted at: $MAIN$

x = ptr_new() doesn't create a new heap variable so you can't assign
anything to *x

you should try with:

IDL> thisstruc = {orbit:'', freq:ptr_new(/alloc)}

or with some value
IDL> thisstruc = {orbit:'', freq:ptr_new(!values.f_nan)}

Ivan

--
Ivan Zimine | ivan.zimine@physics.unige.ch
Dpt. of Radiology | (+41 22) 372 70 70
Geneva University Hospitals |

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		Re: Q: pointers inside of an array of structures? By: Ivan Zimine on Wed, 16 August 2000 00:00
		Re: Q: pointers inside of an array of structures? By: davidf on Wed, 16 August 2000 00:00
		Re: Q: pointers inside of an array of structures? By: Theo Brauers on Wed, 16 August 2000 00:00

Previous Topic:	test (no word wrap), David, please check!
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