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From: "ReversedBias" <thehumblizer@hotmail.com>
Newsgroups: comp.lang.ada
Subject: Ada to C Interface: Passing Pointers Via System.Address
Date: Tue, 11 Jan 2005 21:16:18 -0500
Organization: www.talkaboutprogramming.com
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Date: 2005-01-11T21:16:18-05:00
List-Id: <comp.lang.ada>

I am relatively new to Ada.  I am constructing an API so that my Ada
clients can talk to my C code.  My C functions return pointers to data
structures (very large structures).  I need to then pass the pointer to
the data struct to the Ada code and back into other C functions.  There is
no interaction with the data structure in the Ada code except to pass the
pointer from one C function to another.  I have been trying to use the C
interface pragma and return the pointers from C into an Ada System.Address
and then pass that System.Address into the another pragma back down to the
C functions.  My hope is that the C will be able to type cast the address
back into the correct pointer type.  So far I have not been able to get
this to work properly.  Please advise on another approach or post an
example of how I could do this using the System.Address

Thanks,