Easy Personal Web Page/Easy Personal Web Page.iso/GUIDE_TO/W95SCTXT/SCRIPT.TXT

Text File | 1996-01-08 | 13KB | 472 lines

Dial-Up Scripting Command Language
For Dial-Up Networking Scripting Support


Copyright (c) 1995 Microsoft Corp.


Table of Contents

1.0    Overview
2.0    Basic Structure of a Script
3.0    Variables
    3.1    System Variables
4.0    String Literals
5.0    Expressions
6.0    Comments
7.0    Keywords
8.0    Commands
9.0    Reserved Words




1.0   Overview

Many Internet service providers and online services require you to manually enter information,
such as your user name and password, to establish a connection. With Scripting support for Dial-
Up Networking, you can write a script to automate this process.

A script is a text file that contains a series of commands, parameters, and expressions required by
your Internet service provider or online service to establish the connection and use the service.
You can use any text editor, such as Microsoft Notepad, to create a script file. Once you've
created your script file, you can then assign it to a specific Dial-Up Networking connection by
running the Dial-Up Scripting Tool.


2.0   Basic Structure of a Script

A command is the basic instruction that a script file contains. Some commands require
parameters that further define what the command should do. An expression is a combination of
operators and arguments that create a result. Expressions can be used as values in any
command.  Examples of expressions include arithmetic, relational comparisons, and string
concatenations.

The basic form of a script for Dial-Up Networking follows:

;
; A comment begins with a semi-colon and extends to
; the end of the line.
;

proc main
;  A script can have any number of variables
;  and commands

    variable declarations

    command block

endproc

A script must have a main procedure, specified by the proc keyword, and a matching endproc
keyword, indicating the end of the procedure.

You must declare variables before you add commands. The first command in the main procedure
is executed, and then any subsequent commands are executed in the order they appear in the
script. The script ends when the end of the main procedure is reached.


3.0   Variables

Scripts may contain variables. Variable names must begin with a letter or an underscore ('_'), and
may contain any sequence of upper- or lower-case letters, digits, and underscores. You cannot
use a reserved word as a variable name. For more information, see the list of reserved words at
the end of this document.

You must declare variables before you use them. When you declare a variable, you must also
define its type. A variable of a certain type may only contain values of that same type. The
following three types of variables are supported:

    Type        Description

integer    A negative or positive number, such as 7, -12, or 5698.

string    A series of characters enclosed in double-quotes; for example, "Hello
world!" or "Enter password:".

boolean    A logical boolean value of TRUE or FALSE.

Variables are assigned values using the following assignment statement:

variable = expression

The variable gets the evaluated expression.

Examples:

integer count = 5
integer timeout = (4 * 3)
integer i

boolean bDone = FALSE

string szIP = (getip 2)

set ipaddr szIP


3.1   System Variables

System variables are set by scripting commands or are determined by the information your enter
when you set up a Dial-Up Networking connection. System variables are read-only, which means
they cannot be changed within the script. The system variables are:

Name        Type        Description

$USERID    String        The user identification for the current connection. This variable is
                the value of the user name specified in the Dial-Up Networking
                Connect To dialog box.

$PASSWORD    String        The password for the current connection. This variable is the
                value of the user name specified in the Dial-Up Networking
                Connect To dialog box.

$SUCCESS    Boolean        This variable is set by certain commands to indicate
            whether or not the command succeeded. A script can make
                decisions based upon the value of this variable.

$FAILURE    Boolean        This variable is set by certain commands to indicate
                whether or not the command failed. A script can make decisions
                based upon the value of this variable.


These variables may be used wherever an expression of a similar type is used. For example,

transmit $USERID

is a valid command because $USERID is a variable of type string.


4.0   String Literals

Scripting for Dial-Up Networking supports escape sequences and caret translations, as described
below.

    String Literal    Description

^char    Caret translation

If char is a value between '@' and '_', the character sequence is
translated into a single-byte value between 0 and 31.  For example, ^M is
converted to a carriage return.

If char is a value between a and z, the character sequence is translated
into a single-byte value between 1 and 26.

If char is any other value, the character sequence is not specially treated.

<cr>    Carriage return
<lf>    Linefeed
\"    Double-quote
\^    Single caret
\<    Single '<'
\\    Backslash

Examples:

transmit "^M"
transmit "Joe^M"
transmit "<cr><lf>"
waitfor "<cr><lf>"


5.0    Expressions

An expression is a combination of operators and arguments that evaluates to a result.
Expressions can be used as values in any command.

An expression can combine any variable, or integer, string, or boolean values with any of the
unary and binary operators in the following tables. All unary operators take the highest
precedence. The precedence of binary operators is indicated by their position in the table.

The unary operators are:

    Operator    Type of Operation

    -        Unary minus
    !        One's complement

The binary operators are listed in the following table in their order of precedence. Operators with
higher precedence are listed first:

    Operators    Type of Operation    Type Restrictions

    *  /        Multiplicative        Integers
    +  -         Additive    integers     Strings (+ only)
    < > <= >=    Relational        Integers
    == !=        Equality            Integers, strings, booleans
    and        Logical AND        Booleans

    or        Logical OR        Booleans

Examples:

count = 3 + 5 * 40
transmit "Hello" + " there"
delay 24 / (7 - 1)

6.0   Comments

All text on a line following a semicolon is ignored.

Examples:

; this is a comment

transmit "hello"        ; transmit the string "hello"

7.0   Keywords

Keywords specify the structure of the script. Unlike commands, they do not perform an action.
The keywords are listed below.

proc name

Indicates the beginning of a procedure. All scripts must have a main procedure (proc
main). Script execution starts at the main procedure and terminates at the end of the main
procedure.

endproc

Indicates the end of a procedure. When the script is executed to the endproc statement
for the main procedure, Dial-Up Networking will start PPP or SLIP.

integer name [ = value ]

Declares a variable of type integer. You can use any numerical expression or variable to
initialize the variable.

string name [ = value ]

Declares a variable of type string. You can use any string literal or variable to initialize the
variable.

boolean name [ = value ]

Declares a variable of type boolean. You can use any boolean expression or variable to
initialize the variable.


8.0   Commands

All commands are reserved words, which means you cannot declare variables that have the same
names as the commands. The commands are listed below:

delay nSeconds

Pauses for the number of seconds specified by nSeconds before executing the next
command in the script.

Examples:

delay 2    ; pauses for 2 seconds
delay x * 3    ; pauses for x * 3 seconds


getip  value

Waits for an IP address to be received from the remote computer. If your Internet service
provider returns several IP addresses in a string, use the value parameter to specify
which IP address the script should use.

Examples:

; get the second IP address
set ipaddr getip 2

; assign the first received IP address to a variable
szAddress = getip


goto label

Jumps to the location in the script specified by label and continues executing the
commands following it.

Example:

  waitfor "Prompt>" until 10
  if !$SUCCESS then
    goto BailOut    ; jumps to BailOut and executes commands
            ; following it
  endif

  transmit "bbs^M"
  goto End

BailOut:
  transmit "^M"


halt

Stops the script. This command does not remove the terminal dialog window. You must
click Continue to establish the connection. You cannot restart the script.


if condition then
        commands
    endif

Executes the series of commands if condition is TRUE.

Example:

if $USERID == "John" then
    transmit "Johnny^M"
endif


label :

Specifies the place in the script to jump to. A label must be a unique name and follow the
naming conventions of variables.


set port databits 5 | 6 | 7 | 8

Changes the number of bits in the bytes that are transmitted and received during the
session. The number of bits can be between 5 and 8. If you do not include this command,
Dial-Up Networking will use the properties settings specified for the connection.

Example:

    set port databits 7


set port parity none | odd | even | mark | space

Changes the parity scheme for the port during the session. If you do not include this
command, Dial-Up Networking will use the properties settings specified for the
connection.

Example:

    set port parity even


set port stopbits 1 | 2

Changes the number of stop bits for the port during the session. This number can be
either 1 or 2. If you do not include this command, Dial-Up Networking uses the properties
settings specified for the connection.

Example:

    set port stopbits 2


set screen keyboard  on | off

Enables or disables keyboard input in the scripting terminal window.

Example:

    set screen keyboard on


set ipaddr string

Specifies the IP address of the workstation for the session. String must be in the form of
an IP address.

Examples:

szIPAddress = "11.543.23.13"
set ipaddr szIPAddress

set ipaddr "11.543.23.13"

set ipaddr getip


transmit string [ , raw ]

Sends the characters specified by string to the remote computer.

The remote computer will recognize escape sequences and caret translations, unless you
include the raw parameter with the command. The raw parameter is useful when
transmitting $USERID and $PASSWORD system variables when the user name or
password contains character sequences that, without the raw parameter, would be
interpreted as caret or escape sequences.

Examples:

transmit "slip" + "^M"
transmit $USERID, raw


waitfor string [ , matchcase ] [ then label
    { , string [ , matchcase ] then label } ]
    [ until time ]

Waits until your computer receives one or more of the specified strings from the remote
computer. The string parameter is case-insensitive, unless you include the matchcase
parameter.

If a matching string is received and the then label parameter is used, this command will
jump to the place in the script file designated by label.

The optional until time parameter defines the maximum number of seconds that your
computer will wait to receive the string before it execute the next command. Without this
parameter, your computer will wait forever.

If your computer receives one of the specified strings, the system variable $SUCCESS is
set to TRUE. Otherwise, it is set to FALSE if the number of seconds specified by time
elapses before the string is received.

Examples:

waitfor "Login:"

waitfor "Password?", matchcase

waitfor "prompt>" until 10

waitfor
    "Login:"    then DoLogin,
    "Password:"    then DoPassword,
    "BBS:"        then DoBBS,
    "Other:"    then DoOther
  until 10


while condition do
        commands
endwhile

Executes the series of commands until condition is FALSE.

Example:

integer count = 0

while count < 4 do
    transmit "^M"
    waitfor "Login:" until 10
    if $SUCCESS then
        goto DoLogin
    endif
    count = count + 1
endwhile
    ...


9.0   Reserved Words

The following words are reserved and may not be used as variable names.

    and        boolean        databits        delay
    do        endif        endproc        endwhile
    even        FALSE        getip        goto
    halt        if        integer        ipaddr
    keyboard    mark        matchcase    none
    odd        off        on        or
    parity        port        proc        raw
    screen        set        space        stopbits
    string        then        transmit        TRUE
    until        waitfor        while