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EGACAM.DOC
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1987-05-20
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****************
* EGACAM *
****************
A Screen-Image Capture Utility
EGACAM.COM is a memory-resident screen image capture program. To use it,
you must first install it. The program can be invoked by pressing the
Hot-key "shutter" Alt-PrtSc. This operation will take the contents of the
currently active screen buffer and write it in a file. The contents of the
mode and color registers will also be saved so that the image will be
displayed with the settings in effect when its picture was taken. Screen
image information will be stored in a compressed mode. This is true for
text and graphic modes.
EGACAM is an upgrade of the CAMERA program that forms part of the PRESENT
Silde Presentation System. The upgrade will now capture EGA-mode graphic
images and saves them onto a disk. The format used for EGA-node PICs is one
that is compatible to the newer versions of PRESENT. They can be viewed
with the PICOPY utility.
The camera's "film" consists of a file name pattern with an optional
drive address. The name pattern is a valid file name only 6 characters
long. Pictures will be stored in a file whose name begins with the 6
characters of the pattern followed by a two digit number which will be
incremented every time a picture is taken. The extension will always
be forced to .PIC. If less than 6 characters are specified in the
pattern, zeroes will be added to the right. However, the count will
always be between 00 and 99. If more than 100 pictures are taken the
number will be reset to 0.
Command syntax:
There are two options for the Camera command:
Option 1:
EGACAM [Drive:]Pattern
Where: Drive (optional, if not present the default will be used)
is the drive letter where the pictures will be stored.
Pattern is a one to six character field (no wildcards) that
will become the first six characters of the filenames of
the pictures to be stored. If less than 6 are given, the
remainder will be filled with zeroes.
Note: Path names are not permitted.
Option 2:
EGACAM (enter)
Option 1 is used to install the camera or to change the drive and
filename pattern. (to change its "film")
Option 2 is used to toggle the camera on or off. If the camera was on
it will be turned off and vice-versa. (when the camera is turned off it
will remain in memory but it will not take pictures)
TAKING PICTURES
When the camera is installed and active, two key combinations can be
used to take pictures. Pressing Alt-PrtSc will store the contents of
the currently active screen buffer into the specified file and pressing
Alt-Shift-PrtSc will store the contents of the color screen buffer into
the specified file and assume that a graphics picture is being taken.
This command can be given at either the command level or at an
application program level. Although precautions have been made to allow
its use at anytime, we recommend that you take "still pictures". That is
to say that there be no disk activity in progress when a picture is being
taken. The camera will not signal when it has finished taking a picture,
you will simply notice that the disk in use light goes off. On the other
hand if CAMERA encounters a problem while taking a picture, it will beep to
indicate that something went wrong, either that the disk was full, the
drive was not ready, the disk was write protected, or that there was
another error related to a disk I/O operation. Because of this audible
signal, we urge you to be on the lookout when taking a picture while
the speaker is making sounds.
Because of the way EGACAM is interfaced with DOS the picture taking may
not always be immediate and the program may have to wait for an
interrupt to occur before storing the display contents into a disk, so
be patient. One of these occasions occurs when taking pictures from the
DOS prompt, when you press the keys nothing will happen but if you
press the enter or enter a command, the picture will be stored.
NOTE: When CAMERA's graphics shutter (Alt-PrtSc) is released, it will
look at the BIOS Video Display Data Area to determine the current
mode setting in order to take the correct graphics, 40x25 text,
80x25 text or monochrome picture.
However, there are some programs that do not update the BIOS Video
Display Data Area when changing modes directly without using BIOS.
These tend to be camera shy when displaying text screens and
EGACAM may not be able to take the right picture. One of these
programs is 1-2-3 (TM Lotus Corp.). Pressing Alt-PrtSc will take
a picture of the text screens, pressing Alt-Shift-PrtSc will take
the picture of the graph when it is being displayed. If you press
Alt-Shift-PrtSc when the color screen is displaying text, the
result will be a "compressed" garbage file.
The pictures taken by EGACAM will always have file sizes that are
multiples of 512 bytes to make the best use of a diskette. Text files
will either be 2048 or 4096 bytes in size depending on whether they are
40 or 80 columns texts respectively. Graphics picture sizes will vary
from 512 bytes to 16K depending on the pictures complexity. Obviously,
EGACAM's pictures will be compatible with the PRESENT system programs.
The EGACAM program behave like a single lense reflex camera in the
sense that what you see is what you get. Technically speaking this
means that if you are displaying a text screen on the color monitor,
EGACAM will point to the buffer currently being used so if what is on
the screen is one of the 8 buffers of a 40 column image, EGACAM will
get the right buffer.
*********
EGACAM is copyright (C) 1987 by SML Services, Inc.
All versions of EGACAM are not public domain software, nor are they free
software.
EGACAM is part of the PRESENT Slide Presentation System and its use is
encouraged by existing PRESENT users. If you are not familiar with PRESENT
and wish to know more about it, write for information to:
SML Services, Inc.
6095 River Chase Cir.
Atlanta, Georgia 30328
(404) 953-0792
If you have any questions concerning revisions, updates, or information
concerning any detected "bugs" or incompatibility problems, please drop us
a line or call on the telephone. Technical support is limited to
registered PRESENT users only.
We are interested in increasing the number of different types of screen
image files handled by EGACAM. We encourage you to notify us of formats
that you might consider worthwhile and any and all technical information on
how the files are stored. This means the contents of the file header, as
well as the compression scheme (if any) used to save storage requirements.
If you are interested in being notified of EGACAM upgrades, or related
products, register as as EGACAM user by sending us your name, address and
telephone. You will mailed notices and will be able to receive an upgrade
disk for $5.00 , ($8.00 outside the U.S.)
You are encouraged to use EGACAM and to share it with others, on the
following conditions:
1. This note be included in all copies,
2. The name "EGACAM" must be retained,
3. The Copyright and authorship notices contained in the
program and documentation are not to be altered or removed.
4. The program is not to be distributed to others in
modified form.
5. No fee is to be charged for copying or distributing
the program. Exceptions to this rule are made for non-U.S.,
non-profit, clubs where BBS may not be a viable method of
distribution. Clubs will be allowed to charge a reasonable
charge for distributing a disk with the program.
User groups, clubs and BBS's are encouraged to distribute the program and
documentation, subject to the above limitations.
IN ANY CASE NO COMMERCIAL OR MONEY-MAKING VENTURES WITH REGARD TO SOFTWARE
SALES OR MODIFICATION AND THE SUBSEQUENT SALE OF THE EGACAM PROGRAM IN
WHOLE OR ANY PART IS PERMITTED.
Fernando Pertuz
Alexis Pertuz
SML Services, Inc.
----------------end-of-author's-documentation---------------
Software Library Information:
This disk copy provided as a service of
The Public (Software) Library
Disks in the library are updated monthly.
For a copy of the latest monthly software library newsletter
and a list of the 800+ disks in the library, call or write
The Public (Software) Library
P.O.Box 35705 K
Houston, TX 77235-5705
(713) 721-6104
We are not the authors of this program, nor are we associated
with the author in any way other than as a distributor of the
program in accordance with the author's terms of distribution.
Please direct shareware payments and specific questions about
this program to the author of the program, whose name appears
elsewhere in this documentation. If you have trouble getting
in touch with the author, we will do whatever we can to help
you with your questions. All programs have been tested and do
run. To report problems, please use the form that is in the
file PROBLEM.DOC on many of our disks or in other written for-
mat with screen printouts, if possible.