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Re: Newbie Questions [message #25037 is a reply to message #25036]

Tue, 15 May 2001 11:51

Ben Tupper
Messages: 186
Registered: August 1999

Senior Member

Geoff Herbynchuk wrote:

> On Tue, 15 May 2001, Geoff Herbynchuk wrote:
>
>> Was just wondering if IDL can have pointers to structures. I'm trying to
>> access a variable in the structure with:
>>
>> if (*info).active_cursor EQ 1) then .....
>>
>> And I keep getting an error which says "Expression must be a structure in
>> this context: <PtrHeapVar57>."
>>
>

Hello,

If the active_cursor tag represents the pointer within the structure, then you
will want to dereference it as follows:

if *(info.active_cursor) EQ 1 then .....

As JD has pointed out to the us pointer-challenged, you can also go the lazy
route:

if *info.active_cursor EQ 1 then .....

The way you have written (*info).active_cursor indicates that info is a pointer
to a structre that conatins the active_cursor rather than being a structure
containing a field defined as pointer.

Ben

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[Message index]

		Re: Newbie Questions By: Craig Markwardt on Tue, 15 May 2001 12:21
		Re: Newbie Questions By: Ben Tupper on Tue, 15 May 2001 11:51
		Re: Newbie Questions By: Geoff Herbynchuk on Tue, 15 May 2001 10:17
		Re: Newbie Questions By: Geoff Herbynchuk on Thu, 17 May 2001 05:15

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