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    Documentation for the MenuUtils module v.0.10 

                     � Petrov Software 1992




                           Introduction
                                        
This module is mainly intended for people who write RISC OS
applications in BBC BASIC. It can save programmer from the need to
write his own procedures in BASIC for handling menus. MenuUtils module
can perform all the work needed to create, edit, display and decode
menus. The module is very simple in use and is ideal for creating
simple menus. On the other hand module's advanced features allows
easily create and manipulate even very complex multi-level dynamic
menus.

 

                  What does MenuUtils do ?

The MenuUtils module is not the extension to the Window Manager and it
doesn't provide any extra feature. The module only provides a
convenient interface for the programmer to Window Manager's menu
system. The module has a collection of SWIs to do all the low level
work concerned with direct accesses to menu data structures, memory
allocation, etc. It saves the author of application program from the
need to do this routine work himself.

MenuUtils provides mechanism of item handlers. It allows to attach
individual handler to each menu item. In case of BBC BASIC the handler
may be simply a BASIC function. When menu item is selected the
corresponding item handler may be invoked automatically. This feature
saves the programmer from the need to decode the list of menu
selections. During program development the use of individual item
handlers simplifies the process of menu modification. You can freely
rearrange menu items without the need to make any changes in other
parts of the program. There is an example in the end of this text
which illustrates the use of item handlers in BASIC programs.

MenuUtils automatically allocates memory to hold menu data structures.
And also it takes care about  appearance of menus on screen by forcing
them to be in standard RISC OS style.
                                               
        

                      Technical details                     

Module MenuUtils may be used only by programs which are WIMP tasks.
Special SWI MenuUtil_Initialise is provided to register the program as
MenuUtils client. MenuUtil_Initialise must be called after
Wimp_Initialise has been called and before any other call to MenuUtils
module is made.

All menus created by MenuUtils are kept in RMA. So you have no need to
reserve memory for them. On exit from your program all the memory will
be automatically returned to RMA.

Single MenuUtils module can handle menus for several WIMP tasks.

Internal format of menu data structures created by the module is the
same as described in RISC OS 2 PRM. So it is possible to combine menus
created by MenuUtils with other menus. To find out address of menu
data structure you can use SWI MenuUtil_Info.



                        Menu handles

Menu consists of menu title and one or more menu items. Each menu and
each menu item created with MenuUtils gets unique handle. You can use
this handle to refer to particular menu or menu item.

The use of unique handles for each menu item instead of absolute
addresses or positions in menu gives additional flexibility in
manipulation with menu data structure. It allows for example insert
and delete menu items.

MenuUtils always remembers the handle used in last operation. This
handle is called current handle and it will be used as default in the
next operation. This is especially convenient when calls to the module
are made from BASIC with SYS command.

                                                               

                        Menu creation

To start new menu you must call MenuUtil_New. Then you may add to it
any number of menu items. To add new item you must call MenuUtil_Add.
Menu always is ready to be displayed on screen and you have no need to
specially inform the module when you have added the last item to the
menu.

By default all new items are added to the end of menu. If you want to
insert new item in the middle of menu then you must specify the handle
of the item before which you want to insert the new item.
                                
All menu flags in added items are cleared. Colours and dimensions are
in standard RISC OS style. Width of menu is adjusted automatically.

In order to construct multi-level menu tree you have to connect some
menu items with submenus or with dialog boxes. MenuUtils provides
special SWI to link menu item with submenu. This SWI also allows you
to link menus created by MenuUtils with other menus.

                            

                      Menu modification
                                                                  
You can in any moment change menu title string as well as the text of
menu items. You can also change foreground and background colours of
menu items.
                                              
Menu item has a number of flags which control its appearance and
behaviour. The flags are tick, fade, dots, submenu, writable and
message. Special SWIs are provided to set or clear each menu flag. As
a special case when you are making menu item writable you can also
specify buffer size and optional validation string. 

You can delete single menu item or the whole menu with
MenuUtil_Delete. You can also recursively delete the whole menu
subtree connected with the deleted item or with the deleted menu.

                                                                                  
                   Displaying menu on screen
                   
According to RISC OS rules you must display menu on screen when user
clicks with Menu button over one of your windows or iconbar icon. To
find out where to display the menu you have to perform some
calculations. MenuUtils provides a SWI MenuUtil_Show which will
perform all necessary calculations for you and open menu in the right
screen position according to RISC OS standards.

Special SWI is provided to display submenu in reply to
Message_MenuWarning.



               Item handlers and menu decoding
                                                         
The mechanism of item handlers allows to link each menu item with
individual item handler. The handler may be invoked automatically and
you have no need to decode the list of selections in order to take the
appropriate action.

During the call to "MenuUtil_Initialise" you must specify
initialisation type. Initialisation type defines the interpretation of
item handlers and can be "BASIC" or "machine code" (latter is not
supported in current version). In case of "BASIC" the item handlers
are assumed to be the BASIC functions and in case of "machine code" -
ARM subroutines. If you want to attach a handler to menu item you must
pass the pointer to the name of BASIC function or respectively the
address of the ARM subroutine to MenuUtil_Add.

After user selection the corresponding item handler will be found by
"MenuUtil_Decode". To invoke the handler you have to call either the
BASIC function or the ARM subroutine depending on initialisation type.

            
                           
                        Other features
                 
Many applications use standard menu allowing user to select a colour
from standard desktop colours. MenuUtils provides a special SWI
"MenuUtil_ColourMenu" which creates such colour setting menu.



                      Application notes

This example illustrates the use of menu item handlers in programs in
BBC BASIC. Lets consider simple menu consisting of single item.

            +----------------+
            |                |
            |  Simple menu   |
            |                |
            +----------------+
            |  Item#1        |  
            +----------------+

To create this menu we must call "MenuUtil_New" and to add an item -
"MenuUtil_Add".

 SYS "MenuUtil_New",,"Simple menu"
 SYS "MenuUtil_Add",,"Item#1","func1"

- here "Simple menu" is menu title, "Item#1" - item text and "func1" -
name of the item handler. The name of the handler is "func1" so we
must have a function with the name "FNfunc1".

 DEF FNfunc1
 ...
 =TRUE

Then we organize the main Wimp_Poll loop in the following way.

 DIM q% &100
 REPEAT SYS "Wimp_Poll",,q% TO reason%
   CASE reason% OF
     ...         
     REM Mouse click
     WHEN 6
            IF q%!8=2 THEN SYS "MenuUtil_Show",,q%
 
     REM Menu selection  
     WHEN 9
            SYS "MenuUtil_Decode",,q% TO handler%
            IF handler% THEN
              handler$="FN"+$handler%   
              IF EVAL handler$
            ENDIF
     ...
   ENDCASE
 UNTIL FALSE
    
If the user clicks with Menu button we will call "MenuUtil_Show" to
display menu on screen. If user selects something from our menu we
will call "MenuUtil_Decode" to find out corresponding item handler.
Variable handler% will contain pointer to the handler name. In our
example if user will select item "Item#1" variable handler% will point
to string "func1". The full name of the handler will be
"FN"+$handler%. And EVAL statement is used to call it.
                                                                 

------------------------------------------------------------------------
                    Notes from the author


MenuUtils is freeware software. Everybody is free to use MenuUtils
module, even in commercial code. In case of commercial use I would
like to know this in advance (I could than provide you with the latest
release). You can always contact me if you found some bug, or when
having other suggestions.

         To contact the author of MenuUtils, please write to:
                                      
                                        RUSSIA
                                        115541
                                        Moscow
                                        Kavkazsky boulevard, 29
                                        Bld. 1, Flat 107
                                        Alex Petrov    

                         E-mail: APetrov@misis.msk.su      
                                 APetrov@arm.msk.su
                                 
                         FIDO :  2:5020/104.13

                          phone: +7 095 322 2098
                          fax  : +7 095 236 8350
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*
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*
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*
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*
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*
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*
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00001a90  70 61 73 73 20 74 68 65  20 70 6f 69 6e 74 65 72  |pass the pointer|
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00001be0  20 0a 20 20 20 20 20 20  20 20 20 20 20 20 20 20  | .              |
00001bf0  20 20 20 20 20 20 20 20  20 20 20 20 20 0a 20 20  |             .  |
00001c00  20 20 20 20 20 20 20 20  20 20 20 20 20 20 20 20  |                |
00001c10  20 20 20 20 20 20 4f 74  68 65 72 20 66 65 61 74  |      Other feat|
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00001c30  20 20 20 20 20 20 0a 4d  61 6e 79 20 61 70 70 6c  |      .Many appl|
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00001cc0  75 55 74 69 6c 5f 43 6f  6c 6f 75 72 4d 65 6e 75  |uUtil_ColourMenu|
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00001cf0  69 6e 67 20 6d 65 6e 75  2e 0a 0a 0a 0a 20 20 20  |ing menu.....   |
00001d00  20 20 20 20 20 20 20 20  20 20 20 20 20 20 20 20  |                |
00001d10  20 20 20 41 70 70 6c 69  63 61 74 69 6f 6e 20 6e  |   Application n|
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00001d60  70 72 6f 67 72 61 6d 73  20 69 6e 0a 42 42 43 20  |programs in.BBC |
00001d70  42 41 53 49 43 2e 20 4c  65 74 73 20 63 6f 6e 73  |BASIC. Lets cons|
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00001db0  20 20 20 20 20 20 20 20  20 2b 2d 2d 2d 2d 2d 2d  |         +------|
00001dc0  2d 2d 2d 2d 2d 2d 2d 2d  2d 2d 2b 0a 20 20 20 20  |----------+.    |
00001dd0  20 20 20 20 20 20 20 20  7c 20 20 20 20 20 20 20  |        |       |
00001de0  20 20 20 20 20 20 20 20  20 7c 0a 20 20 20 20 20  |         |.     |
00001df0  20 20 20 20 20 20 20 7c  20 20 53 69 6d 70 6c 65  |       |  Simple|
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00001e10  20 20 20 20 20 20 7c 20  20 20 20 20 20 20 20 20  |      |         |
00001e20  20 20 20 20 20 20 20 7c  0a 20 20 20 20 20 20 20  |       |.       |
00001e30  20 20 20 20 20 2b 2d 2d  2d 2d 2d 2d 2d 2d 2d 2d  |     +----------|
00001e40  2d 2d 2d 2d 2d 2d 2b 0a  20 20 20 20 20 20 20 20  |------+.        |
00001e50  20 20 20 20 7c 20 20 49  74 65 6d 23 31 20 20 20  |    |  Item#1   |
00001e60  20 20 20 20 20 7c 20 20  0a 20 20 20 20 20 20 20  |     |  .       |
00001e70  20 20 20 20 20 2b 2d 2d  2d 2d 2d 2d 2d 2d 2d 2d  |     +----------|
00001e80  2d 2d 2d 2d 2d 2d 2b 0a  0a 54 6f 20 63 72 65 61  |------+..To crea|
00001e90  74 65 20 74 68 69 73 20  6d 65 6e 75 20 77 65 20  |te this menu we |
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00001ed0  65 6e 75 55 74 69 6c 5f  41 64 64 22 2e 0a 0a 20  |enuUtil_Add"... |
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00001f20  22 66 75 6e 63 31 22 0a  0a 2d 20 68 65 72 65 20  |"func1"..- here |
00001f30  22 53 69 6d 70 6c 65 20  6d 65 6e 75 22 20 69 73  |"Simple menu" is|
00001f40  20 6d 65 6e 75 20 74 69  74 6c 65 2c 20 22 49 74  | menu title, "It|
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00001f60  74 20 61 6e 64 20 22 66  75 6e 63 31 22 20 2d 0a  |t and "func1" -.|
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00001f80  20 68 61 6e 64 6c 65 72  2e 20 54 68 65 20 6e 61  | handler. The na|
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00001fa0  72 20 69 73 20 22 66 75  6e 63 31 22 20 73 6f 20  |r is "func1" so |
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00001ff0  2e 2e 2e 0a 20 3d 54 52  55 45 0a 0a 54 68 65 6e  |.... =TRUE..Then|
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00002020  6c 6f 6f 70 20 69 6e 20  74 68 65 20 66 6f 6c 6c  |loop in the foll|
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00002060  2c 2c 71 25 20 54 4f 20  72 65 61 73 6f 6e 25 0a  |,,q% TO reason%.|
00002070  20 20 20 43 41 53 45 20  72 65 61 73 6f 6e 25 20  |   CASE reason% |
00002080  4f 46 0a 20 20 20 20 20  2e 2e 2e 20 20 20 20 20  |OF.     ...     |
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000020a0  75 73 65 20 63 6c 69 63  6b 0a 20 20 20 20 20 57  |use click.     W|
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000020c0  20 20 49 46 20 71 25 21  38 3d 32 20 54 48 45 4e  |  IF q%!8=2 THEN|
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000020e0  68 6f 77 22 2c 2c 71 25  0a 20 0a 20 20 20 20 20  |how",,q%. .     |
000020f0  52 45 4d 20 4d 65 6e 75  20 73 65 6c 65 63 74 69  |REM Menu selecti|
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00002140  72 25 0a 20 20 20 20 20  20 20 20 20 20 20 20 49  |r%.            I|
00002150  46 20 68 61 6e 64 6c 65  72 25 20 54 48 45 4e 0a  |F handler% THEN.|
00002160  20 20 20 20 20 20 20 20  20 20 20 20 20 20 68 61  |              ha|
00002170  6e 64 6c 65 72 24 3d 22  46 4e 22 2b 24 68 61 6e  |ndler$="FN"+$han|
00002180  64 6c 65 72 25 20 20 20  0a 20 20 20 20 20 20 20  |dler%   .       |
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000021b0  20 20 20 20 45 4e 44 49  46 0a 20 20 20 20 20 2e  |    ENDIF.     .|
000021c0  2e 2e 0a 20 20 20 45 4e  44 43 41 53 45 0a 20 55  |...   ENDCASE. U|
000021d0  4e 54 49 4c 20 46 41 4c  53 45 0a 20 20 20 20 0a  |NTIL FALSE.    .|
000021e0  49 66 20 74 68 65 20 75  73 65 72 20 63 6c 69 63  |If the user clic|
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00002280  65 22 20 74 6f 20 66 69  6e 64 20 6f 75 74 20 63  |e" to find out c|
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000022b0  62 6c 65 20 68 61 6e 64  6c 65 72 25 20 77 69 6c  |ble handler% wil|
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000022f0  61 6d 70 6c 65 20 69 66  20 75 73 65 72 20 77 69  |ample if user wi|
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00002370  22 2b 24 68 61 6e 64 6c  65 72 25 2e 20 41 6e 64  |"+$handler%. And|
00002380  20 45 56 41 4c 20 73 74  61 74 65 6d 65 6e 74 20  | EVAL statement |
00002390  69 73 20 75 73 65 64 20  74 6f 20 63 61 6c 6c 20  |is used to call |
000023a0  69 74 2e 0a 20 20 20 20  20 20 20 20 20 20 20 20  |it..            |
000023b0  20 20 20 20 20 20 20 20  20 20 20 20 20 20 20 20  |                |
*
000023e0  20 20 20 20 20 0a 0a 2d  2d 2d 2d 2d 2d 2d 2d 2d  |     ..---------|
000023f0  2d 2d 2d 2d 2d 2d 2d 2d  2d 2d 2d 2d 2d 2d 2d 2d  |----------------|
*
00002420  2d 2d 2d 2d 2d 2d 2d 2d  2d 2d 2d 2d 2d 2d 2d 0a  |---------------.|
00002430  20 20 20 20 20 20 20 20  20 20 20 20 20 20 20 20  |                |
00002440  20 20 20 20 4e 6f 74 65  73 20 66 72 6f 6d 20 74  |    Notes from t|
00002450  68 65 20 61 75 74 68 6f  72 0a 0a 0a 4d 65 6e 75  |he author...Menu|
00002460  55 74 69 6c 73 20 69 73  20 66 72 65 65 77 61 72  |Utils is freewar|
00002470  65 20 73 6f 66 74 77 61  72 65 2e 20 45 76 65 72  |e software. Ever|
00002480  79 62 6f 64 79 20 69 73  20 66 72 65 65 20 74 6f  |ybody is free to|
00002490  20 75 73 65 20 4d 65 6e  75 55 74 69 6c 73 0a 6d  | use MenuUtils.m|
000024a0  6f 64 75 6c 65 2c 20 65  76 65 6e 20 69 6e 20 63  |odule, even in c|
000024b0  6f 6d 6d 65 72 63 69 61  6c 20 63 6f 64 65 2e 20  |ommercial code. |
000024c0  49 6e 20 63 61 73 65 20  6f 66 20 63 6f 6d 6d 65  |In case of comme|
000024d0  72 63 69 61 6c 20 75 73  65 20 49 20 77 6f 75 6c  |rcial use I woul|
000024e0  64 0a 6c 69 6b 65 20 74  6f 20 6b 6e 6f 77 20 74  |d.like to know t|
000024f0  68 69 73 20 69 6e 20 61  64 76 61 6e 63 65 20 28  |his in advance (|
00002500  49 20 63 6f 75 6c 64 20  74 68 61 6e 20 70 72 6f  |I could than pro|
00002510  76 69 64 65 20 79 6f 75  20 77 69 74 68 20 74 68  |vide you with th|
00002520  65 20 6c 61 74 65 73 74  0a 72 65 6c 65 61 73 65  |e latest.release|
00002530  29 2e 20 59 6f 75 20 63  61 6e 20 61 6c 77 61 79  |). You can alway|
00002540  73 20 63 6f 6e 74 61 63  74 20 6d 65 20 69 66 20  |s contact me if |
00002550  79 6f 75 20 66 6f 75 6e  64 20 73 6f 6d 65 20 62  |you found some b|
00002560  75 67 2c 20 6f 72 20 77  68 65 6e 0a 68 61 76 69  |ug, or when.havi|
00002570  6e 67 20 6f 74 68 65 72  20 73 75 67 67 65 73 74  |ng other suggest|
00002580  69 6f 6e 73 2e 0a 0a 20  20 20 20 20 20 20 20 20  |ions...         |
00002590  54 6f 20 63 6f 6e 74 61  63 74 20 74 68 65 20 61  |To contact the a|
000025a0  75 74 68 6f 72 20 6f 66  20 4d 65 6e 75 55 74 69  |uthor of MenuUti|
000025b0  6c 73 2c 20 70 6c 65 61  73 65 20 77 72 69 74 65  |ls, please write|
000025c0  20 74 6f 3a 0a 20 20 20  20 20 20 20 20 20 20 20  | to:.           |
000025d0  20 20 20 20 20 20 20 20  20 20 20 20 20 20 20 20  |                |
000025e0  20 20 20 20 20 20 20 20  20 20 20 0a 20 20 20 20  |           .    |
000025f0  20 20 20 20 20 20 20 20  20 20 20 20 20 20 20 20  |                |
*
00002610  20 20 20 20 52 55 53 53  49 41 0a 20 20 20 20 20  |    RUSSIA.     |
00002620  20 20 20 20 20 20 20 20  20 20 20 20 20 20 20 20  |                |
*
00002640  20 20 20 31 31 35 35 34  31 0a 20 20 20 20 20 20  |   115541.      |
00002650  20 20 20 20 20 20 20 20  20 20 20 20 20 20 20 20  |                |
*
00002670  20 20 4d 6f 73 63 6f 77  0a 20 20 20 20 20 20 20  |  Moscow.       |
00002680  20 20 20 20 20 20 20 20  20 20 20 20 20 20 20 20  |                |
*
000026a0  20 4b 61 76 6b 61 7a 73  6b 79 20 62 6f 75 6c 65  | Kavkazsky boule|
000026b0  76 61 72 64 2c 20 32 39  0a 20 20 20 20 20 20 20  |vard, 29.       |
000026c0  20 20 20 20 20 20 20 20  20 20 20 20 20 20 20 20  |                |
*
000026e0  20 42 6c 64 2e 20 31 2c  20 46 6c 61 74 20 31 30  | Bld. 1, Flat 10|
000026f0  37 0a 20 20 20 20 20 20  20 20 20 20 20 20 20 20  |7.              |
00002700  20 20 20 20 20 20 20 20  20 20 20 20 20 20 20 20  |                |
00002710  20 20 20 20 20 20 20 20  20 20 41 6c 65 78 20 50  |          Alex P|
00002720  65 74 72 6f 76 20 20 20  20 0a 0a 20 20 20 20 20  |etrov    ..     |
00002730  20 20 20 20 20 20 20 20  20 20 20 20 20 20 20 20  |                |
00002740  20 20 20 20 45 2d 6d 61  69 6c 3a 20 41 50 65 74  |    E-mail: APet|
00002750  72 6f 76 40 6d 69 73 69  73 2e 6d 73 6b 2e 73 75  |rov@misis.msk.su|
00002760  20 20 20 20 20 20 0a 20  20 20 20 20 20 20 20 20  |      .         |
00002770  20 20 20 20 20 20 20 20  20 20 20 20 20 20 20 20  |                |
00002780  20 20 20 20 20 20 20 20  41 50 65 74 72 6f 76 40  |        APetrov@|
00002790  61 72 6d 2e 6d 73 6b 2e  73 75 0a 20 20 20 20 20  |arm.msk.su.     |
000027a0  20 20 20 20 20 20 20 20  20 20 20 20 20 20 20 20  |                |
000027b0  20 20 20 20 20 20 20 20  20 20 20 20 0a 20 20 20  |            .   |
000027c0  20 20 20 20 20 20 20 20  20 20 20 20 20 20 20 20  |                |
000027d0  20 20 20 20 20 20 46 49  44 4f 20 3a 20 20 32 3a  |      FIDO :  2:|
000027e0  35 30 32 30 2f 31 30 34  2e 31 33 0a 0a 20 20 20  |5020/104.13..   |
000027f0  20 20 20 20 20 20 20 20  20 20 20 20 20 20 20 20  |                |
00002800  20 20 20 20 20 20 20 70  68 6f 6e 65 3a 20 2b 37  |       phone: +7|
00002810  20 30 39 35 20 33 32 32  20 32 30 39 38 0a 20 20  | 095 322 2098.  |
00002820  20 20 20 20 20 20 20 20  20 20 20 20 20 20 20 20  |                |
00002830  20 20 20 20 20 20 20 20  66 61 78 20 20 3a 20 2b  |        fax  : +|
00002840  37 20 30 39 35 20 32 33  36 20 38 33 35 30 0a     |7 095 236 8350.|
0000284f