From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me X-Spam-Level: X-Spam-Status: No, score=-0.9 required=5.0 tests=BAYES_00,FORGED_GMAIL_RCVD, FREEMAIL_FROM autolearn=no autolearn_force=no version=3.4.4 X-Google-Thread: 103376,7e490a18b9688bd9 X-Google-NewGroupId: yes X-Google-Attributes: gida07f3367d7,domainid0,public,usenet X-Google-Language: ENGLISH,ASCII Received: by 10.68.28.231 with SMTP id e7mr1138704pbh.5.1316113181607; Thu, 15 Sep 2011 11:59:41 -0700 (PDT) Path: m9ni6976pbd.0!nntp.google.com!news1.google.com!postnews.google.com!en1g2000vbb.googlegroups.com!not-for-mail From: Alexander Korolev Newsgroups: comp.lang.ada Subject: Re: Stream_Element_Array Date: Thu, 15 Sep 2011 11:58:21 -0700 (PDT) Organization: http://groups.google.com Message-ID: References: <1e6rw4vto3ldb.i8d7fxixapx4.dlg@40tude.net> <28u4e86fk8gn$.ialexttobgr0$.dlg@40tude.net> <276b8d0a-5b3c-4559-a275-98620657cc2f@s30g2000pri.googlegroups.com> <01c12338-e9f8-49ab-863d-c8282be3875e@g31g2000yqh.googlegroups.com> <1esmml9qftomp.vihelaijmcar$.dlg@40tude.net> NNTP-Posting-Host: 96.49.119.210 Mime-Version: 1.0 X-Trace: posting.google.com 1316113181 29773 127.0.0.1 (15 Sep 2011 18:59:41 GMT) X-Complaints-To: groups-abuse@google.com NNTP-Posting-Date: Thu, 15 Sep 2011 18:59:41 +0000 (UTC) Complaints-To: groups-abuse@google.com Injection-Info: en1g2000vbb.googlegroups.com; posting-host=96.49.119.210; posting-account=9aAl4woAAACPkuvNJOQxyBXxG_5lfu_0 User-Agent: G2/1.0 X-Google-Web-Client: true X-Google-Header-Order: HUARLECNK X-HTTP-UserAgent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10_6_5; ru-ru) AppleWebKit/533.18.1 (KHTML, like Gecko) Version/5.0.2 Safari/533.18.5,gzip(gfe) Xref: news1.google.com comp.lang.ada:17976 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Date: 2011-09-15T11:58:21-07:00 List-Id: On Sep 15, 12:20=A0pm, "Dmitry A. Kazakov" wrote: > On Wed, 14 Sep 2011 14:29:41 -0700 (PDT), Alexander Korolev wrote: > > "In your case the other end is not the memory but the wire" > > I am not sure I undestand you complitly. What's wrong, at least for > > now, to build \ construct in memory the Buffer (Stream_Element_Array) > > with full command (according the format I posted) inside and after > > that send it over any stream (including GNAT.Serial, Socket etc) > > derived from Root_Stream_Type. Basicly, I don't need even a Type - > > I am using it just get Unsigned_16 serialized into Stream Elements. > > Yes, but in most cases it does not work so straightforwardly. You usually > need headers, checksums etc. The point is that you have more layers of th= e > protocol than just raw values over stream of octets. This is why you use > stream rather as a transport for packets/messages and often more upper > levels too (state machine etc). The idea is to always encapsulate each > level into a data type. It saves much time later. > > > That's it. It's kind of hadcrafting. I also can override My_Type'Write > > attribute and send to Serial port ... Your approach is to create a new > > stream actully, which will take into account the PROTOCOL specifics. > > Absolutly agree with that. But what is wrong with manual approach I am > > implementing. > > It is not wrong, it is just might not work because protocols are more > complex (layered) than this simple model. > > -- > Regards, > Dmitry A. Kazakovhttp://www.dmitry-kazakov.de 1. Can not disagree again - layers, state machines is "must" part. 2. So far got some interim results with serialization of the Type in Volatile Stream. The Last set to 3? It looks I am getting there but no confidence so far. type Message_Length is record Lenght:Interfaces.Unsigned_16 :=3D Interfaces.Unsigned_16(256); end record; ------------- procedure length_test is V1 : aliased Volatile_Streams.Memory_Resident_Stream (Size =3D> 1024); Temp_Stream_Element :Stream_Element; Message_Length_Instance :Message_Length; Message_Lenght_Elements :Stream_Element_Array(1..4); begin Message_Length'Write(V1'Access,Message_Length_Instance); -- Write into and serialize into in - memory stream Message_Length_Instance read (V1, Message_Lenght_Elements, Last); -- Read out in-memry stream. Assigns Message_Lenght and Last for J in Message_Lenght_Elements'First .. Last loop Temp_Stream_Element :=3D Message_Lenght_Elements(J); Put_Line( Temp_Stream_Element'Img); end loop; Put_Line( "Last"); Put_line (Last'Img); -- print out the Last end; with Lenght:Interfaces.Unsigned_16 :=3D Interfaces.Unsigned_16(255); -- output ../development/projects/length_test 255 0 0 Last 3 [2011-09-15 11:26:32] process terminated successfully (elapsed time: 00.13s) with Lenght:Interfaces.Unsigned_16 :=3D Interfaces.Unsigned_16(256); --output ../development/projects/length_test 0 1 0 Last 3 [2011-09-15 11:43:12] process terminated successfully (elapsed time: 00.13s)