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Re: New free DLL for calling Python from IDL! [message #87953 is a reply to message #87943] Wed, 05 March 2014 11:02 Go to previous messageGo to previous message
Haje Korth is currently offline  Haje Korth
Messages: 651
Registered: May 1997
Senior Member
Chris.
this makes perfect sense and explains the differences in behavior of my and the Slither DLMs between different IDL versions. I only use the simple stuff (no pointer), which my brain can process! In that case, it seems to make common sense that new symbols should always be appended at the end, where it would not affect old code. I guess that is what you meant with being more careful where you insert the new symbol.

Cheers,
Haje

On Tuesday, March 4, 2014 10:27:34 PM UTC-5, Chris Torrence wrote:
> Also, following on Haje's post, yes, it totally depends upon what symbols you use. If you look at the bottom of the idl_export.h file (in the distribution), you'll see all the exported symbols. Occasionally, we will insert a new symbol into the middle of that list, which will move all of the other symbols down. So as long as you aren't using any symbols below the new one, you will get lucky and your DLM will work correctly. Before IDL 8.3, we weren't really being careful about where we inserted symbols, and just assumed that users would need to recompile their DLM's for each release. Now, we'll try to be more careful. Even so, there's still a possibility that Slither (and other DLM's) won't work correctly in a new version unless they are recompiled.
>
>
>
> Cheers,
>
> Chris
>
> ExelisVIS
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