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- Screen.BIN
-
- Copyright (C) Paul B. Powers, August 18, 1990
-
- When distributing the screen.bin file this text file,
- readme.scr is to be distributed along with it. This software is
- being distributed as Freeware and no payment is charged for its
- use or distribution. The author has made every available attempt
- to test this piece of software. However, the author cannot be
- held responsible for any damage, loss or other mishaps as a
- result of the usage of this software.
-
- NOTE: This can be downloaded from the DBASE forum on CompuServe,
- Library 4, as SCREEN.ZIP -- this .zip file includes the .ASM source
- code.
-
- The bin file takes two parameters. the bin file can be called
- with the call command or function - Call or Call() as follows;
-
- load screen
-
- * either *
- call screen with <parameter1>, <parameter2>
- * or *
- memvar = call("screen","<parameter1>,"<parameter2>")
-
- release module screen
-
- parameter1 has the following option;
- "W" or "w" - which will write the screen characters and
- attributes to the filename specified in
- parameter2. Neither write mode will
- overwrite a file.
-
- "W-" or "w-" - which will write only the screen characters
- to the file spoecified in parameter2.
- Neither write mode will overwrite a
- file.
-
- "A" or "a" - which will only append the screen characters to
- the filename specified in parameter2.
- The append mode will only concatenate
- the characters to the end of the file
- specified in parameter2.
-
- "R" or "r" - which will read the file and print it on the
- screen, whether the bin file prints only
- characters or both characters and color
- attributes depends on the size of the
- source file to be read (see chart
- below). specified by
-
- parameter 2 is the drive:\path\filename of the file that is
- to be read, written, or appended.
-
-
- You can also use a text editor to make the text file to be
- read in. To do this make sure you use only spaces, don't use any
- tabs to fill in blank spaces. Each row on the screen is expected
- to be 81 characters long. The first 80 characters are expected
- to be text characters (i.e. no tabs, use the spacebar to create
- blank spaces), on column 81 you are expected to press the enter
- key. If you are in a 25-line mode (Mono, CGA, EGA or VGA) make
- sure the text file has 25 lines. If you are in a 43-line mode
- (EGA) or a 50-line mode (VGA) make sure the text file has 43 or
- 50 lines in it, respectively. This file format is designed so
- that a text editor will be to read a text file that is created by
- screen.bin with the "w-" or the "a" option. To see the type of
- file screen.bin creates creates in general see the diagram below.
-
-
-
-
-
- For writing your own text files to use with screen.bin the format
- is as follows:
-
- text file
- 1 80 81
- |------------------------------------------------------|<cr>/<lf>
- | |
- | |
- | characters go here |
- | |
- | |
- |------------------------------------------------------|
- | |
- | |
- | (optional) attributes go here, |
- | not used with the "w-" and "a" modes |
- | |
- |------------------------------------------------------|
-
- The "r" option will read in and interpret the file as having
- characters only or having both characters and color attributes
- based on the size of the specified text file. The interpretation
- will be based as follows:
-
-
- 25-line mode 4098 bytes: (82 bytes/row) * (25 rows) * 2 (for
- and above character and color
- attributes).
- Why 82 bytes/row instead
- of 81 is that a text
- editor will place two
- characters (a <cr> and a
- <lf>) in the file when
- the [enter] key is
- pressed. This resultant
- size will actually work
- out to be 4101 bytes.
- Three bytes are taken off
- the file size in case the
- last <cr>/<lf> and the
- end-of-file
- marker is not added on.
-
- 2048 to : (82 bytes/row) * (25 rows). Only
- 4097 bytes characters will be read from
- the specified text file.
-
-
-
- 43-line mode 7050 bytes: (82 bytes/row) * (43 rows) * 2 Both
- and above characters and color
- attributes will be read
- from the specified
- text file.
-
- 3524 to : (82 bytes/row) * (43 rows). Only
- 7049 bytes characters will be read from the
- specified text file.
-
-
-
- 50-line mode 8198 bytes: (82 bytes/row) * (50 rows) * 2. Both
- and above character and color
- attributes will be read
- from the specified text
- file.
-
- 4098 to : (82 bytes/row) * (50 rows). Only
- 8197 bytes characters will be read from the
- specified text file.
-
-
-
- Since some people have a "beta" version of this bin file a
- listing of the changes and fixes have been provided.
-
- Version 1.1b - Changes and Fixes.
-
- 1. Bug fix regarding reading the color attributes. Reading in a
- file with color attributes to write to the screen resulted in the
- color attributes being read in, but shifted one column to the left
- on the screen. The text would appear normal on the screen but it's
- color attribute would appear column to the left of the text. This
- bug has been fixed.
-
- 2. At the DOS-prompt type "type screen.bin" to see the version number-
- thanks goes to Keith Mund for presenting this idea to me.
-
-
- Version 1.2 - Changes.
-
- 1. Screen.bin can now be called with the call() function, and will
- pass back an error/success code to dBASE IV. The error codes
- are assigned as follows;
-
- 1: Product is not dBASE IV (you should never see this error code,
- let me know if you do).
-
- 2: Lines on screen are not set to 25, 43, or 50.
-
- 3: First parameter was not a "W","w","R","r","A", or an "a".
-
- 4: Unable to open file, the file does not exist, was previously
- opened or the path was mispelled .
-
- 5: File is too small to read, for the current line mode.
-
- 6: Unable to position a file pointer for a file read.
-
- 7: Error occured during a file read.
-
- 8: file already exists (happens with the "W","W-","w" or "w-"
- option).
-
- 9: Unable to create the file (happens with the "W","W-","w","w-"
- and the "A" and "a" options).
-
- A: Unable to position a file pointer for a file write.
-
- B: Error occured during a file write.
-
- C: File failed to close.
-
- Version 1.2b - Fixes
-
- 1. Minor corrective coding change provided to ensure proper
- embedding of carriage return/linefeeds and end of file markers in
- the output file.
-
- Version 1.2c - Changes
-
- 1. Just a change in what the copyright says when a "type
- screen.bin" writes when executed from a dos-prompt. Nothing else
- has changed.
-
-
-
- Further Enhancements:
-
- If you like this piece of software or think it could be
- enhanced in a certain fashion please contact him. Any further
- advancement of this bin file will be proportional to it's use AND
- the response for enhancement of those who use it.
-
- The author can be contacted by E-mail on the Ashton Tate BBS at;
-
- 1200 BAUD (213)538-6196
-
- 2400 BAUD (213)324-2188
-
- or on Compuserv (for free access use this route),
- at the "Host Name:" prompt type "ATBBS"
-
-
- Please leave E-mail for the user name of Plpowers.
-
-
- Special thanks goes to those who were part of the beta-testing on
- this bin file, they are;
-
- Judy Maske
- Dan Madoni
- Roger Bowman
-
- Thanks very much guys !
-
-
- And lastly thank you very much, and enjoy !