OS X Externals

Brian Yennie briany at qldlearning.com
Mon Nov 1 23:46:52 CST 2004

FWIW, binary values can be passed in externals using the MCString 
structure and the GetXVariable / SetXVariable callbacks- there is an 
example in the SDK albeit non-obvious.

You mentioned problems with binary data especially from images on Mac- 
any chance you haven't accounted for imageData coming in opposite order 
on Mac versus Windows (i.e. red-green-blue versus blue-green-red). Just 
a shot in the dark...

- Brian

> with a wrapper written in Transcript which basically dumps the arg 
> into a variable, which in turn is read by the external; the code is 
> posted as part of the bugzilla report (#2308)
> On Nov 1, 2004, at 2:24 PM, Dar Scott wrote:
>> I have heard rumors of a method for passing binary data as an arg, 
>> but I don't know how it works.
>> My external SDK says data is a null terminated string.  That means no 
>> binary.  (Without some method to avoid nulls.)
>> How are you passing binary as an arg?
> -----------------------------------------------------------
> Frank D. Engel, Jr.  <fde101 at fjrhome.net>
> $ ln -s /usr/share/kjvbible /usr/manual
> $ true | cat /usr/manual | grep "John 3:16"
> John 3:16 For God so loved the world, that he gave his only begotten 
> Son, that whosoever believeth in him should not perish, but have 
> everlasting life.
> $
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