XCMD Limitations

[Richard Gaskin]

Ben Rubinstein wrote:

> Is there a reference anywhere to the limitations on XCMD/XFCNs?
> 
> I've got a limited time budget to try to convert a big complicated stack to
> Rev; and I'm crashing in an XFCN.  It's not an option to recode this XFCN;
> it uses custom libraries of proprietary code.  It's going to be a big pain
> in the bottom to work through to find out where it's crashing (the entire
> machine locks up each time) so I could use some hints.
> 
> I know that the callbacks to do with windows don't work.  Are there others?
> Would it be correct to assume that MC implements all the HyperCard 1.0
> callbacks, but none of those introduced in HC 2.0 (or whenever it was)?
> 
> Is there a list somewhere of the supported or unsupported callbacks?  Are
> there any other guidelines?  Is there any handy debugging mode built into
> the engine to help?

What does the exernal do?

Perhaps it could be rewritten in native MetaTalk....

-- 
 Richard Gaskin 
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