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Difference between revisions of "Character escape codes"

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{{AI}}
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Escape sequences use an escape character to change the meaning of the characters which follow it. Escape sequences can be used for two purposes:
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* to use non-printable characters in [[Event_Handler#Built-In_Action_Commands|action strings]], e.g. in strings on [[EDO]] port and [[MPP]] commands
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* quoting: ignore special meaning of a character in eventhandler parser.
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The escape sequences are substituted when the eventhandler reads the action string. In the case of Data Protocol Commands ( @ $ ), the  escape sequences are substituted ''before'' the messages are sent to the Data Protocol Router / Handler.
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In the AlphaCom the character backslash (\) is used as escape character.
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Escape sequences:
 
{| border="1"
 
{| border="1"
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! style="background:#ffdead;" width="150" | Char
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! style="background:#ffdead;" width="70" | Escape sequence
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! style="background:#ffdead;" width="500" | Description
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! style="background:#ffdead;" width="70" | Result
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! style="background:#ffdead;" width="150" | Approximately Size
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! style="background:#ffdead;" width="30" | Hex code
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! style="background:#ffdead;" width="550" | Description
 
|-
 
|-
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| alpha_sys_xxx || AlphaCom Main software components and scripts || 2,1M
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| align=center|\, || align=center| , || 2C || Comma
 
|-
 
|-
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| alpha_billing_xxx || AlphaCom Billing software components and scripts || ??M
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| align=center|\( || align=center| ( || 28 || Opening parenthese
 
|-
 
|-
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| alpha_standard_apps || AlphaCom Application Support standard on flash version || 2.8M
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| align=center|\) || align=center| ) || 29 || Closing parenthese
 
|-
 
|-
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| alpha_extended_apps || AlphaCom Application Support Extended version on mounted Network Disk || 17M (To be reduced)
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| align=center|\" || align=center| " || 22 || Double quote
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|-
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| align=center|\; || align=center| ; || 3B || Semicolon
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|-
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| align=center|\\ || align=center|\ || 5C || Backslash
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|-
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| align=center|\% || align=center|% || 25 || Percent
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|-
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| align=center|\t || align=center|TAB || 09 || ASCII TAB (Horisontal tab)
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|-
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| align=center|\s || align=center|SP || 20 || Space
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|-
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| align=center|\r || align=center|CR || 0D || Carriage return
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|-
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| align=center|\n || align=center|LF || 0A || Line feed
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|-
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| align=center|\a || align=center|BEL || 07 || Bell (Alert)
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|-
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| align=center|\b || align=center|BS || 08 || Backspace
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|-
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| align=center|\0 || align=center|NUL || 00 || ASCII NUL
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|-
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| align=center|\l ||   || 80 || Extended NUL ('\x80')
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|-
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| align=center|\! || align=center|   ||   || Ignore rest of string
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|-
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| align=center|\xhh || align=center|   ||   || 'hh' is the ASCII character code as 2 hex digits. Note that you must use 2 digits.
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|-
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| align=center|\#hh || align=center|   ||   || 'hh' is the ASCII character code as 2 hex digits. Note that you must use 2 digits.
 
|-
 
|-
 
|}
 
|}
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<br>
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<br>
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By using the escape sequence '\xhh' all sorts of ASCII characters can be generated.
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<br><br>
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[[Category:Event Handler]]

Latest revision as of 14:13, 25 August 2020

AI.png

Escape sequences use an escape character to change the meaning of the characters which follow it. Escape sequences can be used for two purposes:

  • to use non-printable characters in action strings, e.g. in strings on EDO port and MPP commands
  • quoting: ignore special meaning of a character in eventhandler parser.

The escape sequences are substituted when the eventhandler reads the action string. In the case of Data Protocol Commands ( @ $ ), the escape sequences are substituted before the messages are sent to the Data Protocol Router / Handler.

In the AlphaCom the character backslash (\) is used as escape character.


Escape sequences:

Escape sequence Result Hex code Description
\, , 2C Comma
\( ( 28 Opening parenthese
\) ) 29 Closing parenthese
\" " 22 Double quote
\; ; 3B Semicolon
\\ \ 5C Backslash
\% % 25 Percent
\t TAB 09 ASCII TAB (Horisontal tab)
\s SP 20 Space
\r CR 0D Carriage return
\n LF 0A Line feed
\a BEL 07 Bell (Alert)
\b BS 08 Backspace
\0 NUL 00 ASCII NUL
\l   80 Extended NUL ('\x80')
\!     Ignore rest of string
\xhh     'hh' is the ASCII character code as 2 hex digits. Note that you must use 2 digits.
\#hh     'hh' is the ASCII character code as 2 hex digits. Note that you must use 2 digits.



By using the escape sequence '\xhh' all sorts of ASCII characters can be generated.

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