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Image_Files.doc
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1988-08-10
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Image files
You need to be aware that the AVT pays attention to the mode you are
in when you select SAVE SSTV and LOAD SSTV from the project menu.
If you are in a color mode (111, Robot composite {cmp}, AVT) then the
AVT system will save and load all three buffers into one file.
Depending on the particulr mode, that is, whether it is hi-res or lo-res,
the file extension is changed between these three:
.Ahi, high, and .low
If you are in a B&W mode, again, depending on the resolution, the
file extension is changed between these two:
.bwh and .bwl
Be careful - make sure the extension that you expected is in the
extension box in the file requetser - if it's not, you were probably in
the wrong mode when you selected the file requester. CANCEL the
requester, select the proper mode for the file you are saving, and
select save (or load) again.
File Sizes:
SSTv
.bwl - 16384 bytes 32 blocks
.bwh - 65536 bytes 256 blocks
.low - 49152 bytes 96 blocks
.high - 196605 bytes 768 blocks
FAX
.fax - 614400 bytes 1200 blocks
Using the File Requester
The file requester used in this program is a very powerful mouse driven
type developed by Black Belt Systems for use in it's products.
The file requester has three main areas. These are a LIST area, a TEXT
area, and a CONTROL BUTTON area.
The LIST area contains three independant lists. Each list is constructed in
the same manner.
There are eight available "slots" in a list. To the left of each "slot" is
a "select button" that may be pressed to select that item in the list.
To the right of each list is a standard proportional gadget, and two "arrow
buttons". If there are more than eight entries in a particular list, then
the knob in the prop gadget will shorten, and you will be able to scan the
items in the list by moving the knob with your mouse.
Additionally, you may choose to point at and "press" the arrow buttons,
which will move the items through the list one at a time.
Note that the "slot", or the text area, is a string gadget; you can, if a
name in the list is too long to see, point and click within the text slot
and use the cursor keys to scroll the item through the slot horizontally in
order to read it in it's entirety.
The leftmost list is a list of FILES that are in the currently selected
directory. Items in the FILE list will only show if (A), they have the same
extension as is specified in the "Extension:" field of the text area, or
(B), if the "Extension:" field of the text area is blank.
The center list is a list of VOLUMES that are currently mounted in your
Amiga's filesystem. This list may also display any "Assigned" volume names
active in your system if the "Assigns" control button is selected.
The rightmost list is a list of DIRECTORIES that are in the currently
selected directory.
The TEXT area of the file requester contains five individual text gadgets.
Four are for your use, and one, the "Messages:" one, is for the file
requester's use in telling you what is going on with operations you are
asking it to do. Those provided for your use are used as follows:
PATH:
This item is used to control where the file requester "looks" for it's
lists of directories and files. You can type into this item at any time by
pointing into it with the mouse and clicking once. You can also set this
item to a particular position in the filesystem by selecting items from the
list of DIRECTORIES, items from the list of VOLUMES, or by pressing the
PARENT control button. If you elect to type into it, make sure you press
one of the ENTER or RETURN keys on the keyboard when you are done editing
the information inside the PATH item. This forces the file requester to try
and find that directory in the Amiga's filesystem.
FILE:
This item is used to determine the actual file that the operation the file
requester was invoked to perform will use as it's target. You can fill in
this entry by hand, or by pressing a SELECT button in the FILE list. If you
enter a file name in here and it does not exist in the current directory,
then a message to that effect will appear in the "Messages:" item. If you
have an extension specifed in the "Extension:" field, then the file name
will NOT have it's extension in the filename area. If you do not have an
extension specified, the file WILL have it's extension.
EXTENSION:
This is an optional field that, if filled in, will force the requester to
only show files in the FILE list that have a matching trailing extension.
If it is empty, then all files in the directory will show in the FILE list.
COMMENT:
This item is used to show you comments that are associated with files you
select. If you are going to be creating a new file, or writing out an old
one, you can enter text into this item and it will be written with the file
as a standard AmigaDOS comment.
The CONTROL BUTTON area provides seven different control operations. Each
is defined in the following section;
<---->:
The first button will appear with different legends inside it, such as
load, save, send, capture, and so on. Pressing this button will close the
file requester and inform the main program that you wish to proceed with
the chosen operation, and that you wish to use the file you selected.
CANCEL:
Pressing this button will close the file requester and inform the main
program that you wish to CANCEL the chosen operation. The file you chose,
if any, is ignored completely.
PARENT:
Pressing this button causes the file requester to move "back" one level in
the file structure, unless it is already at the root of the volume it is
working on.
DELETE:
Pressing this button will delete the file you have chosen using the file
requester. The file requester does NOT terminate, but allows you to select
another operation instead.
SORT:
This is a "one-shot" sort button. All three lists are sorted alphabetically
into ascending order. Using this button can help you to easily find a file
or directory when the lists are large and hard to manage.
SORTLOCK:
This is like the Shift-Lock key on your keyboard; if you prefer to have the
sort function always operate when you are using the file requester, then
press this button. Each time the file requester is brought up, the lists
will be sorted for you. Pressing the button again will turn off the
function.
ASSIGNS:
This button is also a lock type function. It changes the center list from
showing only volumes to showing volumes AND "assigns". This can be handy if
your system is heavily salted with assigned volume names. Pressing the
button again will turn off the function.