From: jsanchor@my-dejanews.com
Subject: System.Address_to_Access_Conversions
Date: 1998/07/13
Date: 1998-07-13T00:00:00+00:00 [thread overview]
Message-ID: <6odddl$k94$1@nnrp1.dejanews.com> (raw)
Hello Everyone: In my program I have some system address and I have to move
data to it. I am using access types to do this. I don't want to use Unchecked
conversion. So I started looking at a new feature Ada95 has
System.Address_to_Access_Conversions. I have
type Dummy_Type is tagged private;
type Ptr_to_Data_Type is access all Dummy_Type'class;
private
type Dummy_Type is tagged
record
checksum : Storage_Element;
end record;
Dummy : Dummy_Type;
Ptr_to_Data : Ptr_to_Data_Type;
I want Ptr_to_Data to point to some system address, say, 16#00E00000#
with unchecked conversion I could say,
function Convert_to_Pointer is new UNCHECKED_CONVERSION (
source => system.address,
target => Ptr_to_Data_Type);
Ptr_to_Data := Convert_to_Pointer(16#00E00000#);
I tried using System.Address_to_Access_Conversions,
package Convert_to_Pointer is new
System.Address_to_Access_Conversions(system.address);
Data_Ptr : Convert_to_Pointer.Object_Pointer;
Data_Ptr := Convert_to_Pointer(16#00E00000#); --This is my problem!!
-- I need a type Ptr_to_Data_Type, NOT Convert_to_Pointer.Object_Pointer
I tried casting
Ptr_to_Data := Ptr_to_Data_Type(Data_Ptr); --It compiled..but when I ran it
SEGMENTATION FAULT ERROR showed up.
Can anybody suggest how do I get the correct access type to point to memory.
Thank you in advance.
Jay S.
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next reply other threads:[~1998-07-13 0:00 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
1998-07-13 0:00 jsanchor [this message]
1998-07-13 0:00 ` System.Address_to_Access_Conversions Stephen Leake
1998-07-14 0:00 ` System.Address_to_Access_Conversions jsanchor
1998-07-14 0:00 ` System.Address_to_Access_Conversions Pascal MALAISE
1998-07-14 0:00 ` System.Address_to_Access_Conversions jsanchor
1998-07-14 0:00 ` System.Address_to_Access_Conversions David C. Hoos, Sr.
1998-07-14 0:00 ` System.Address_to_Access_Conversions jsanchor
1998-07-14 0:00 ` System.Address_to_Access_Conversions David C. Hoos, Sr.
1998-07-14 0:00 ` System.Address_to_Access_Conversions nabbasi
1998-07-14 0:00 ` System.Address_to_Access_Conversions David C. Hoos, Sr.
1998-07-15 0:00 ` System.Address_to_Access_Conversions jsanchor
1998-07-15 0:00 ` System.Address_to_Access_Conversions David C. Hoos, Sr.
1998-07-14 0:00 ` System.Address_to_Access_Conversions Robert Dewar
1998-07-26 0:00 ` System.Address_to_Access_Conversions Matthew Heaney
1998-07-26 0:00 ` System.Address_to_Access_Conversions nababsi
1998-07-26 0:00 ` System.Address_to_Access_Conversions Robert Dewar
1998-07-26 0:00 ` System.Address_to_Access_Conversions Matthew Heaney
1998-07-26 0:00 ` System.Address_to_Access_Conversions Robert Dewar
1998-07-26 0:00 ` System.Address_to_Access_Conversions nabbasi
1998-07-26 0:00 ` System.Address_to_Access_Conversions Charles Hixson
1998-07-26 0:00 ` System.Address_to_Access_Conversions Robert Dewar
1998-07-26 0:00 ` System.Address_to_Access_Conversions Charles Hixson
1998-07-14 0:00 ` System.Address_to_Access_Conversions Anonymous
-- strict thread matches above, loose matches on Subject: below --
1998-07-15 0:00 System.Address_to_Access_Conversions Marin David Condic, 561.796.8997, M/S 731-96
1998-07-26 0:00 ` System.Address_to_Access_Conversions Matthew Heaney
1998-07-27 0:00 System.Address_to_Access_Conversions Marin David Condic, 561.796.8997, M/S 731-96
1998-07-28 0:00 ` System.Address_to_Access_Conversions Stephen Leake
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