| Ansi X3.64 |
Article Index for Ansi |
Website Links For Escape |
Information AboutAnsi X3.64 |
| CATEGORIES ABOUT ANSI ESCAPE CODE | |
| user interface techniques | |
| iso standards | |
|
Most of these Escape Sequence s start with the characters '''ESC''' ( ASCII Decimal 27/ Hex 0x1B/ Octal 033) and ''' SUPPORT Most Terminal Emulator s running on Unix-like systems such as Linux have support built in, as do such systems' native consoles. Windows and DOS Windows 95, Windows 98 and DOS systems need a Device Driver for the ANSI codes - the de facto standard being ANSI.SYS , but others are used as well.Console windows in Windows versions based on NT (NT4, 2000 Professional, 2000 Server, XP, Server 2003, Vista, Server "Longhorn") do not natively support ANSI Escape sequences, though some support is possible. By adding the following line to the CONFIG.NT file located in the Windows System32 directory, ANSI output from 16-bit legacy programs executing under the NTVDM will be interpreted: DEVICE=ANSI.SYS Some support is also offered through alternate command processors such as JP Software's 4NT and Michael J. Mefford's ANSI.COM. In other words, 32-bit character-mode windows applications can not write ANSI escape sequences to the console, but must interpret their actions and call the native Console API intrinsic to accomplish the proper result. Note that the window's Console API does have some restrictions regarding ''blink'', ''underline'' and ''reverse'' VGA attributes. In exchange for ''blink'', the screen allows for bright background colors. No access from user-mode is given to set the underline registers . The following attribute bits for SetConsoleTextAttribute() have no function even though they are listed: COMMON_LVB_REVERSE_VIDEO COMMON_LVB_UNDERSCORE Reverse can be emulated in one's code without much difficulty. If ANSI.SYS is loaded in MS-DOS , the Escape Character can be specified as prompt '' would specify a blue background as part of the prompt. In most modern programming languages it can be specified as "" ( Perl and Ruby also offer the equivalent "\e"), in Java it can be specified as "\u001B", and in QBasic or GWBASIC , it can be specified as CHR$(27) or CHR$(&H1B).Note: most devices only support a subset of the SGR (Select Graphic Rendition) codes. CODES The general structure of an ANSI code is CSI ''n1'' ; ''n2''... ''letter''. The numbers are optional parameters, and the final letter specifies the command. The default value used for omitted parameters varies with the command; it is usually 1 or 0.EXAMPLES CSI 0 ; 6 8 ; "DIR" ; 13 p — This re-assigns the key F10 to send to the keyboard buffer the string "DIR" and ENTER, which in the DOS command line would display the contents of the current directory. (MS-DOS ANSI.SYS only)CSI 2 J — This clears the screen and, on some devcies, locates the cursor to the y,x position 1,1 (upper left corner).CSI 32 m — This makes text green. On MS-DOS, normally the green would be dark, dull green, so you may wish to enable Bold with the code CSI 1 m which would make it bright green, or combined as CSI 32 ; 1 m. MS-DOS ANSI.SYS uses the Bold state to make the character Bright; also the Blink state can be set (via INT 10, AX 1003h, BL 00h) to render the Background in the Bright mode. MS-DOS ANSI.SYS does not support SGR codes 90–97 and 100–107 directly.CSI s — This saves the cursor position. Using the code CSI u will restore it to the position. Say the current cursor position is 7(y) and 10(x). The code CSI s will save those two numbers. Now you can move to a different cursor position, such as 20(y) and 3(x), using the code CSI 20 ; 3 H or CSI 20 ; 3 f. Now if you use the code CSI u the cursor position will return to 7(y) and 10(x). Some terminals require the DEC sequences ESC 7 / ESC 8 instead.SEE ALSO EXTERNAL LINKS
|
|
|