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Device Update Agent Script Conventions (Windows Embedded Standard 2009)

4/23/2012

The Device Update Script must be created by using specific guidelines. The following lists show the rules to follow when you type characters into a source or input file:

  • Lexical conventions:
    Follow these character set guidelines when you write a script for DUA:
    • Encoding
      All source files must be encoded using ASCII.
    • White space
      The blank, horizontal tab, new line, carriage return, form feed, and vertical tab formatting characters are collectively known as white-space characters. Use these characters to format the source file layout for visual clarity.
    • Line termination
      The new line, carriage return, form feed and vertical tab characters cause line-termination. The character following the line-termination is considered the first character of the next line.
      Do not exceed 4096 characters on a command line.
  • Comments
    Begin a comment line in the source file with the characters '//'. Type the same characters at the end of each line.
  • Tokens
    The characters that constitute the source file are collected into lexical tokens. Adjacent tokens can be separated by white space or comments.
  • Constants
    Constants can be numeric or string constants. The following list shows the constants:
    • A numeric constant is a decimal integer value.
    • A string constant is a sequence of characters. A string constant can be empty. If a white-space character is significant in the context of the command, enclose it in double quotation marks.
    • The Device Update Agent script compiler supports the use of named constants. Named constants are specified within the command set reference. Parameters that are specified as both a name and as a value can be scripted by using the named constant.
      For additional information about constants, see Constants.
    • You can use the bitwise OR operator (|) when expressing constants. This is useful for combining bit flags in a constant expression.
  • Command lines
    A command line holds a single command. End-of-line markers separate commands. Each command line starts with a command, followed by one or more parameters separated by commas.
    If a numeric command argument is not specified, the default value is used if a default value is specified; otherwise, zero is used.
    If a non-numeric value is specified, where a numeric argument is expected, zero will be used.

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