Pascal Newsletter #24 - 11-JUL-2001
INDEX
1. A FEW WORDS FROM THE EDITOR
2. DBISAM
- What is DBISAM?
- Features
- Licensing
- Pricing and Ordering
- Evaluation
- Support
- More information
3. CUSTOM CONTAINERS PACK (CCPACK 5)
- What is Custom Containers Pack?
- Downloads
- A sample composite component
- More information
4. A SIMPLE DATABASE APPLICATION
5. NEWS
- Delphi3000.com announces its new membership system
- Kylix Desktop Developer Edition for just $199!
- Borland releases educational editions
- BORCON 2001
- Borland's new registration policy
6. DECOMPILING DELPHI EXECUTABLES
7. DELPHI ON THE NET
________________________________________________________________________
1. A FEW WORDS FROM THE EDITOR
In this issue I'm glad to introduce DBISAM, one of the best BDE
replacements available in the market for Delphi and C++ Builder.
If you are interested in component writing, I recommend you to read the
article about CCPack5. With this freeware expert you can easily develop
composite components.
As promised in the last issue, here you'll find an example of a simple
database application for beginners in database programming.
I hope you enjoy this issue... and don't forget to vote for us! ;)
Regards,
Ernesto De Spirito
eds2008 @ latiumsoftware.com
________________________________________________________________________
JfControls Library. Multi-language. Multi-appearance. Skins. Privileges.
More than 40 integrated and customizable components. Impressive GUI.
Centralized resources administration. Multiple programming problems
solved. For Delphi 3-2006 & C++ Builder 3-6. http://www.jfactivesoft.com
________________________________________________________________________
2. DBISAM
What is DBISAM?
===============
DBISAM is a database management system that is linked into your Delphi
and C++ Builder applications, and it solves many problems associated
with the BDE and MDAC.
DBISAM tables use a proprietary file format, but they can be converted
to and from MS Access tables, Paradox and other BDE tables. DBISAM
tables can be easily created and restructured by code, and normally they
don't need to be packed since DBISAM automatically re-uses all free
space in data, index, and blob files (although you can easily pack
tables if you deem it necessary). With DBISAM it's easy to encrypt a
table protected with a password.
Data corruption is a worry with other systems. DBISAM is very stable and
minimizes the chance of corruption due to power loss, and it comes with
an utility to repair tables if they ever get corrupted.
Applications using DBISAM can be run from a CD-ROM and they can access
DBISAM databases in a CD-ROM or marked with the Read-Only attribute.
DBISAM provides progress events for indexing, repairing, copying,
optimizing and restructuring tables, so you can show the user a visual
indication of the progress of any of those operations.
DBISAM is multi-user. It automatically manages all cache refresh and
locking issues transparently. Locking is implemented at record level,
not at page level.
DBISAM is thread-safe and can be used in multiple threads as long as you
use a different, dynamically-created TDBISAMSession component instance
per thread. This also means that any TDBISAMDatabase, TDBISAMTable, or
TDBISAMQuery components must be created dynamically and attached only to
the TDBISAMSession component for the current thread. DBISAM's in-memory
tables are also thread-safe, so you can safely share the in-memory
tables among multiple threads just like a normal table.
Features
========
We can talk a lot about DBISAM, but let's allow the features speak by
themselves:
* Productivity Features
- Compiles directly into your .EXE with no external .DLLs or
configuration files needed
- Has a very small footprint, only 250-300k (base engine size, does
not include data access component layer)
- Transparent single-user and multi-user usage with no configuration
changes required
- Complete source code for all utilities provided, and source code for
DBISAM itself is available for an additional charge
* Version Support
- Available for Delphi 3, 4, 5 and C++Builder 3, 4, 5
- TDBISAMTable, TDBISAMQuery, TDBISAMDatabase, and TDBISAMSession
components provided for all versions of Delphi (3, 4, 5) and C++
Builder (3, 4, 5)
* International Support
- International support for over 100 languages
- Language and sorting information is stored in each table, no
configuration files or special drivers needed
* Database Engine Features
- Does not pre-allocate large blocks of memory and uses a very small
amount of memory per table
- Primary and secondary indexes with support for case-insensitive,
descending, and unique attributes
- Configurable index key compression
- Logical sequence numbers that show exact position of record in
relation to total records, even with a range set
- Partial index key searches and ranges
- Accurate record counts, even with active ranges and/or filters
- Complete expression filter support including a filter optimizer,
SUBSTRING, TRIM, LOWER, UPPER, POS, OCCURS, REPLACE, EXTRACT, CAST,
ABS, ROUND, and IF functions, IN, LIKE, IS NULL, and BETWEEN
extended operators.
- SQL SELECT, INSERT, UPDATE, DELETE CREATE TABLE, ALTER TABLE, DROP
TABLE, CREATE INDEX, and DROP INDEX support, complete with a query
optimizer, sub-selects, SUM MIN, MAX, COUNT, and AVG aggregate
functions, SUBSTRING, TRIM, LOWER, UPPER, POS, OCCURS, REPLACE,
EXTRACT, CAST, ABS, ROUND, and IF functions, IN, LIKE, IS NULL, and
BETWEEN extended operators, both live and canned result sets,
parameterized queries, queries on queries (INTO clause), in-memory
query result sets, query progress events, SQL DDL scripts, and
extended SQL syntax for DBISAM-specific features
- Shareable in-memory tables that are identical to disk-based tables
and include streaming support
- All native Delphi field types (including BCD, BLOB, and auto-
increment field types) supported
- Configurable block sizes for BLOBs
- NULL support
- Min, Max, and Required constraints and default values and character-
case specifiers for fields
- Long field names and field and table descriptions for reference
purposes
- Encryption of tables with passwords
- User-defined versioning of tables
- User-defined semaphore locking
- Automatic record locking and manual table locking
- Automatic change detection with configurable change detection policy
- lazy or strict
- Complete cache management including intelligent read-ahead record
buffering, index page buffering, BLOB block buffering, and
optimized, serialized writes
- Automatic read-only support for CD-ROMs including optimized
buffering
- Buffered transactions that allow tables to survive unexpected client
workstation power-downs with little, or in most cases, no data
corruption
- Built-in table verification and repair facilities complete with
progress and log events
- Built-in table restructure facilities complete with progress and
data conversion events
- Automatic free space recycling for data records, index pages, and
BLOB blocks
- Built-in table optimization facilities complete with progress events
- Multi-threading support
- Fast performance. DBISAM outperforms Access, Paradox and many
others.
* Utilities Provided
- DBISAM software utilities are available to anyone and, if needed,
may be re-distributed to customers.
- BDE Database Transfer Utility for transferring BDE-based tables to
DBISAM format
- Database System Utility for creating, restructuring, browsing,
searching, querying, reverse-engineering, and repairing tables
interactively
* Features Not Supported
- Stored procedures
- Batch moves (native import/export). However there's a sample of code
meant to perform that task.
- Cached updates
Licensing
=========
DBISAM is licensed for royalty-free use within your compiled Delphi
and/or C++Builder applications.
You have to purchase one license of DBISAM for each full licensed copy
of Delphi and/or C++Builder into which you intend to install the DBISAM
components. For example, if you own one licensed copy of Delphi 3, the
Delphi 3.01 upgrade, the Delphi 4.0 upgrade, etc., you are only required
to purchase only one DBISAM license. However, if for example you own two
licensed copies of Delphi 3.0, you are required to purchase two DBISAM
licenses to be able to use DBISAM in both.
Pricing and Ordering
====================
A license of DBISAM costs U$S 249, plus additional U$S 130 if you want
the source code. There is a 10% discount off of the normal price of
DBISAM for educational and governmental institutions as well as for
full-time students at an educational institution.
http://www.elevatesoft.com/sales.htm
Evaluation
==========
There's a free trial version available for download. The only difference
with the commercial version is that a nag dialog that appears once
during the initialization of DBISAM when the application is executed
outside the IDE, and the license only allows its use for evaluation
purposes only.
* DBISAM Trial Version - Version 2.10
http://www.elevatesoft.com/download?action=login
* Additional Software and Utilities
http://www.elevatesoft.com/download?action=login
Support
=======
Elevate Software offers electronic support via email or through their
officially-monitored support newsgroups. E-mail and newsgroup support
questions are answered within 12 hours of their receipt. Support e-mail
and newsgroup posts are reviewed every hour from 8:00 am EST to 8:00 pm
EST, so the longest wait for a response should be 24 hours.
Elevate Software provides support for those evaluating the trial version
of DBISAM.
* Email:
support@mail.elevatesoft.com
* Newsgroups:
- Announcements
news://news.elevatesoft.com/elevatesoft.public.announcements
- Public Beta Tests
news://news.elevatesoft.com/elevatesoft.public.beta
- DBISAM
news://news.elevatesoft.com/elevatesoft.public.dbisam
- General Discussion
news://news.elevatesoft.com/elevatesoft.public.discussion
- Third Party Job Postings
news://news.elevatesoft.com/elevatesoft.public.jobs
- SQL
news://news.elevatesoft.com/elevatesoft.public.sql
- Enhancement Suggestions
news://news.elevatesoft.com/elevatesoft.public.suggestions
- Test Posts
news://news.elevatesoft.com/elevatesoft.public.test
- Third Party Announcements and Information
news://news.elevatesoft.com/elevatesoft.public.thirdparty
More information
================
You can find more information about DBISAM, including customer quotes,
screen shots, on-line user's manual, technical bulletins, etc. at
Elevate Software's web site:
http://www.elevatesoft.com/
---------------------
Portions of this article were taken from Elevate Software's web site and
are Copyright (c) 2001 Elevate Software - All Rights Reserved. They have
been reproduced and modified here with the author's permission.
________________________________________________________________________
3. CUSTOM CONTAINERS PACK (CCPACK 5)
What is Custom Containers Pack?
===============================
CCPack 5 is a freeware package that allows you to visually combine,
extend and inherit VCL containers. The package was developed by Sergey
Orlik, Product Manager of Inprise Moscow office (Russia, C.I.S. and
Baltic States).
CCPack 5 works with Delphi/C++Builder 5, and is the evolution of two
existing Delphi/C++Builder 3,4 add-ins: Custom Forms Pack (CFPack) and
Composite Components Pack (CCPack 4).
One of the common uses of CCPack 5 is to create components made of
various components:
* CCPack Introduction movie
http://www.geocities.com/sergey_orlik/ccpmovie.zip (~337K)
Downloads
=========
* Custom Containers Pack (CCPack 5) para Delphi 5
http://cc.codegear.com/Item.aspx?id=13985 (~695K)
* Custom Containers Pack source code port to Delphi 7
http://cc.codegear.com/Item/19483 (~356K)
* Custom Containers Pack source code port to Delphi 6 - 2006
http://cc.codegear.com/item.aspx?id=24236 (~584K)
Full source code is provided and you can modify it without restriction
for any non-commercial projects. Let the author know if you want to use
this software in your commercial projects by e-mail <sorlik@inprise.ru>
stating the tool's name in the subject line.
A sample composite component
============================
After you have installed CCPack, you're ready for the first example.
Close all Delphi projects. In the "File" menu choose "New...", select
"Custom Container" (or "Composite Control" in Delphi 3/4) in the "New
items" dialog, and click "OK". In the "New Container" dialog select
"TFrame", write "TFileComposite" in the "New class name" field and click
"Finish".
A form appears. Its surface is the surface of your new Delphi component.
Set the following properties in the Object Inspector:
Width = 281
Height = 164
This will be the default size of the component. Drop a Panel onto the
form, and set its properties:
Align = alLeft
Width = 130
BevelOuter = bvNone
Caption =
Constraints.MinWidth = 110
Drop a Splitter to the right to the panel. It will align automatically
to the side of the panel. Drop a DriveComboBox and a DirectoryListBox on
the panel and set their properties:
DriveComboBox:
Left = 0
Top = 0
Width = 130
Height = 19
Anchors = [akLeft, akTop, akRight]
DirectoryListBox:
Left = 0
Top = 19
Width = 130
Height = 145
Anchors = [akLeft, akTop, akRight, akBottom]
Click on the right side of the form, and drop a FileListBox:
Align = alClient
TabOrder = 0
With this we have completed the visual interface of our composite
component. Now it's time to add some code to "link" the components.
Double click the DriveComboBox and in the Change event handler write:
procedure TFileComposite.DriveComboBox1Change(Sender: TObject);
begin
DirectoryListBox1.Drive := DriveComboBox1.Drive;
end;
Double click the DirectoryListBox and in the Change event handler write:
procedure TFileComposite.DirectoryListBox1Change(Sender: TObject);
begin
FileListBox1.Directory := DirectoryListBox1.Directory;
end;
With this we have completed the basic behavior of our composite
component, which for the programming interface will inherit the methods
and properties from TFrame (the base class we chose when we created
the component). Let's add a couple of public properties: FileName and
Directory. In the declaration of the class add:
type
TFileComposite = class(TFrame)
:
:
protected
{ Protected declarations }
function GetFileName: string;
procedure SetFileName(FileName: string);
function GetDirectory: string;
procedure SetDirectory(Directory: string);
public
{ Public declarations }
property FileName: string read GetFileName write SetFileName;
property Directory: string read GetDirectory write SetDirectory;
:
:
The implementation is quite simple. Basically we get and set the
FileName of the FileListBox and the Directory property of the
DirectoryListBox:
function TFileComposite.GetFileName: string;
begin
Result := FileListBox1.FileName;
end;
procedure TFileComposite.SetFileName(FileName: string);
begin
FileListBox1.FileName := FileName;
end;
function TFileComposite.GetDirectory: string;
begin
Result := DirectoryListBox1.Directory;
end;
procedure TFileComposite.SetDirectory(Directory: string);
begin
DirectoryListBox1.Directory := Directory;
end;
Now let's add three events: Change, Click and DblClick. In the
declaration of the class add:
type
TFileComposite = class(TFrame)
:
:
private
{ Private declarations }
FOnChange: TNotifyEvent;
FOnClick: TNotifyEvent;
FOnDblClick: TNotifyEvent;
protected
:
public
:
published
{ Published declarations }
property OnChange: TNotifyEvent read FOnChange write FOnChange;
property OnClick: TNotifyEvent read FOnClick write FOnClick;
property OnDblClick: TNotifyEvent read FOnDblClick write
FOnDblClick;
end;
As you might be guessing, these events will be triggered by the Change,
Click and DblClick events of the FileListBox, so generate the
corresponding event handlers and write the following:
procedure TFileComposite.FileListBox1Change(Sender: TObject);
begin
if Assigned(FOnChange) then FOnChange(Self);
end;
procedure TFileComposite.FileListBox1Click(Sender: TObject);
begin
if Assigned(FOnClick) then FOnClick(Self);
end;
procedure TFileComposite.FileListBox1DblClick(Sender: TObject);
begin
if Assigned(FOnDblClick) then FOnDblClick(Self);
end;
If you wonder about the Assigned function, please allow me to explain.
FOnChange is a field of type TNotifyEvent, and this means that it can
hold the address of a procedure of object that takes a "Sender: TObject"
parameter... or it can be Nil, so we should make sure that FOnChange
isn't Nil before making the call "FOnChange(Self)". However, the
following won't work:
if FOnChange <> nil then ...
The reason is that referring FOnChange is taken by the compiler as an
invocation of the procedure it points to. Since it's a procedure, it
doesn't return a value type-compatible with a pointer (so we can't
compare it with Nil), but before realizing this, the compiler will find
that we forgot the parameter (Sender) in the call to FOnChange... Our
intention is not to call the procedure FOnChange points to, but to know
whether the value of FOnChange isn't Nil. This is the purpose of the
built-in Assigned function used above.
For the purpose of the example, this is it. You can install this unit
and then use the component from the Components Palette, or you can
include the unit in a test project and create the component by code like
we did in the test application to save you from having to install a
useless component.
As you can see, with CCPack someone with little experience in component
writing can build composite components quickly and easily.
More information
================
You can find more information about CCPack, and find other components at
Sergey Orlik's web site:
http://www.geocities.com/sergey_orlik
________________________________________________________________________
4. A SIMPLE DATABASE APPLICATION
From time to time at Latium Software we receive a request like the
following:
> I'd like to know which is the way to build a database application with
> Delphi. I already know how to work with tables, forms, components,
> etc. What I want to know is the way to integrate everything...
In many ways Delphi is like those construction kits I played with when I
was a boy. These kits had many pieces of different shapes, sizes and
colors, and with them you could build whatever you wanted, limited only
by your imagination... and the available pieces, of course. Delphi has a
lot of components and you can use them to build the application you
want. Borland does not suggest a way to do things. They just put the
bricks there, and it's up to you how you build your house.
There are many ways to do things. In the archive attached to this
newsletter you'll find one of these ways. It doesn't intend to be the
best way to write a database application, or a recommended way to do it.
What's more, I don't even claim it's a good way to do it. The intention
is simply to serve as an example showing one of the possibilities. You
can improve it and use it as a base for your own projects.
When you take a look at the example, you'll see that I used a data
module with two tables (Customers and Orders, that come as sample tables
with the BDE) with a master-detail relationship (you can see it in the
Data Diagram). If you double click on the Table components you'll see
that I defined some properties of the fields like the display width,
display format, edit mask, etc. I placed the DataSource components in
the data module, to show that you can place them there and not
necessarily place one on each form that access these tables.
The application uses a MDI interface. From the menu you can show the
Customers form, which displays the content of the Customers table in a
DbGrid. In the form there's a button "Orders..." to show the orders
placed by the currently selected customer. Notice that you can switch
back to the Customers form and if you move to another record, the
Orders form gets automatically updated (thanks to the master-detail
relationship set between the two tables).
In both forms you have buttons to add, edit and delete records from the
respective tables. The "Add..." and "Edit..." buttons show a modal form
that allows you to add or edit a single record. You'll see that this
form is created the first time and then it's hidden when closed, so it's
readily available if we need to invoke it again. The form will be
released automatically when its parent form is released.
In the Order form there's an example of a DbCombo and a DbLookupCombo
that lists a calculated field from another table (Employees).
We leave the rest of the example for your analysis. If you have doubts
or questions about it, I'd like to invite you to join our low-traffic
forum for Delphi programmers at Yahoo! Groups, where other members or
even ourselves might be able to help.
Home: http://groups.yahoo.com/group/delphi-en
Join: http://groups.yahoo.com/group/delphi-en/join
delphi-en-subscribe@yahoogroups.com
________________________________________________________________________
5. NEWS
Delphi3000.com announces its new membership system
==================================================
Delphi3000.com now offers three kinds of membership:
* Bronze Membership. Limited access. Free.
* Silver Membership. Full access. USD 4.90/mo.
Uploaders get a free Silver Membership.
* Gold Membership. Full access, plus a message in the newsletter.
USD 14.90/mo.
Delphi3000.com members now have iTecture CodeFinder, an application to
browse the Delphi3000.com database off-line.
Why? http://www.delphi3000.com/why.asp
Details: http://www.delphi3000.com/whysignup.asp
NOTE: If you can't enter the site with www.delphi3000.com try with
213.208.2.22 instead.
Kylix Desktop Developer Edition for just $199!
==============================================
Exactly as the title reads, Borland is selling the Desktop Developer
Edition (DDE) of Kylix for only just $199! Yes! Only just $199! You
don't believe it? Well, read it by yourself:
http://shop.borland.com/Product/0,1057,3-15-CQ100479,00.html
If you bought Kylix DDE before this offer was in effect, you can contact
your local Borland Customer Service to get a free upgrade to Kylix
Server Development Edition.
Borland releases educational editions
=====================================
Borland now offers educational editions of Delphi and Kylix:
* Delphi 6 Enterprise Educational edition.......................$399
* Delphi 6 Professional Educational edition......................$99
* Kylix Server Developer Educational edition (available soon)...$399
* Kylix Desktop Educational edition (available soon).............$99
BORCON 2001
===========
The 12th Annual Borland Conference (BORCON 2001) will be held from July
21 to 25 in Long Beach, California. There's still time to register.
http://www.borland.com/conf2001/
Borland's new registration policy
=================================
Starting with JBuilder 5 and Delphi 6, registration of Borland software
is no longer optional:
* Open letter to the Borland Community regarding registration of Borland
products - by David Intersimone
http://community.borland.com/article/0,1410,27382,00.html
* Delphi 6 Internet registration - by David Intersimone
http://community.borland.com/article/0,1410,27385,00.html
________________________________________________________________________
6. DECOMPILING DELPHI EXECUTABLES
It isn't possible to recover completely the original Delphi sources of
an application from its executable file, far from that, but something
can be done. If you are interested in decompiling or reverse engineering
Delphi executables, I suggest you the following pages:
* EXE2DPR - Delphi project sources Rescuer
Versions supported: Delphi 1.0-4.0 and C++Builder 3.0
http://www.ems.ru/~gold/exe2dpr.html
* DeDe
Versions supported: Delphi 2,3,4,5 and Builder
http://www.softpedia.com/progDownload/DeDe-Download-1426.html
* Revendepro
Versions supported: Delphi 4 and Delphi 5
http://www.puthoon.com/Revendepro/index.html
* MultiRipper
Versions supported: N/A
http://www.csee.uq.edu.au/~csmweb/decompilation/application.html
* Delphi project sources rescuer - without sources
Versions supported: Delphi 3 and Delphi 4
shareit1.element-5.de/programs.html?productid=100815&languageid=1
________________________________________________________________________
7. DELPHI ON THE NET
* Delphi Database Programming Course - by Zarko Gajic
Free online database programming course for beginner Delphi developers
focused on ADO techniques. Three new chapters have been added in the
last two months (Chapter 9 "Searching for data", Chapter 10 "ADO
Cursors" and Chapter 11 "From Paradox to Access with ADO and Delphi").
http://delphi.about.com/compute/delphi/library/weekly/aa010101a.htm
* An introduction to hook procedures - by Chris Cummings
What Windows hooks are and how to use them in a Delphi application.
http://delphi.about.com/compute/delphi/library/bluc/text/uc063001a.htm
* Sticky Windows - by Zarko Gajic
How to dock your Delphi forms to the edges of your desktop screen.
http://delphi.about.com/library/weekly/aa070301a.htm
* Automating Internet Explorer to find all links on a web page
- By Corbin Dunn - Borland Developer Support Staff
You may want to find all links on a given web page. This document has
source code and directions on how to do this.
http://community.borland.com/article/0,1410,26574,00.html
* General Issues in Delphi Client/Server Development - by Bill Wolf
This paper will cover some important aspects of client/server
development learned the hard way – in real world situations. It will
include a brief overview of the client/server methodology and a
discussion of why so many projects run in to difficulties as well as
ways to avoid them.
http://ourworld.compuserve.com/homepages/billw/dl130.htm
* Anti Cracking FAQ - by R. Fellner
How to make cracking your programs a little harder
http://www.inner-smile.com/nocrack.phtml
* Kylix & Delphi 6 New Language Features - by Dr. Bob
This article shows a few of the Kylix and Delphi 6 changes in the
compiler and the RunTime Library (RTL).
http://www.drbob42.com/Delphi5/examin19.htm
* Cross-platform DrBobCGI (and Cookies) - by Dr. Bob
This article presents the cross-platform edition of DrBobCGI (to
produce web server applications with Delphi and Kylix without the need
for the WebBroker Technology). As one of the examples, Dr.Bob shows
how to (set and) get cookie values using DrBobCGI.
http://www.drbob42.com/Delphi5/examin18.htm
* Shakespeare on the Web - by John Kaster
This article shows how to produce a basic web service application that
spews Shakespearean insults
http://community.borland.com/article/0,1410,27399,00.html
* Community TV: RAD Product Group Overview with Simon Thornhill
Anders O interviews Simon Thornhill about Delphi 6 and future plans of
the RAD product group. Now with MP3 audio and text transcript.
http://community.borland.com/article/0,1410,27299,00.html
* Community TV: Delphi 6 XML Data Bindings with Mark Edington
John K talks with Mark Edington about XML Data Bindings and how
support for XML DOM is implemented with Object Pascal language
bindings. Includes MP3 audio and text transcript.
http://community.borland.com/article/0,1410,27323,00.html
* Community TV: Delphi 6 Overview with Michael Swindell
Anders O interviews Michael Swindell, Director of Product Management
for the RAD Group, who provides an overview of Delphi 6's new features
BizSnap, WebSnap and DataSnap. Includes text transcript and audio mp3
http://community.borland.com/article/0,1410,27300,00.html
* Getting started with WebSnap in Delphi 6 Enterprise
John K explains how to use the WebSnap framework to produce a fully
functional browser-based database application, complete with graphic
field support
http://community.borland.com/article/0,1410,27404,00.html
________________________________________________________________________
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________________________________________________________________________
If you haven't received the full source code examples for this issue,
you can get them from http://www.latiumsoftware.com/en/file.php?id=p24
________________________________________________________________________
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