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On 16/09/2009, at 4:27 PM, David FOXWELL wrote:
In your example, what is the importance of passing dsSize and
dsFormat ?
Because only the address of the 'thing' (dsBase) is being passed.
Therefore you only know where it is. You don't know how long is or its
layout. You could simply write the receiving program to expect a
specific data structure but that's less flexible.
Duane's interface is much like the IBM API interface where the caller
can instruct the receiver on how much data to return (dsSize) and in
what format that data should be provided (dsFormat). This also allows
the receiving program to be modified to return different or additional
information without requiring the callers to be modified.
Regards,
Simon Coulter.
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