ASP Tutorials - Herong's Tutorial Notes
Dr. Herong Yang, Version 4.11

Microsoft Scripting Runtime DLL

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ASP Tutorials - Herong's Tutorial Notes © Dr. Herong Yang

hyBook - Guestbook Application

Using MS Access Databases

ActiveX Data Object (ADO)

Controlling Response Header Lines

Microsoft Scripting Runtime DLL

Using Cookies

ASP Sessions

ASP Objects

Microsoft Script Debugger

Internet Information Services (IIS)

... Table of Contents

"scrrun.dll"

Microsoft provides one DLL (c:\winnt\system32\scrrun.dll) for both IIS Web server side scripting and IE Web browser client side scripting with several classes:

  • Dictionary
  • FileSystemObject
  • Drive
  • Folder
  • File
  • TextStream

"Dictionary" Class

Dictionary: A class representing a collection of pairs of keys and values. It offers the following methods and properties:

  • "Add key, item": Method to add a pair of key and value to this dictionary.
  • "Exists(key)": Method to return true if the specified key exists in this dictionary.
  • "Keys()": Method to return an array containing all the keys in this dictionary.
  • "Items()": Method to return an array containing all the values in this dictionary.
  • "Remove(key)": Method to remove a pair of key and value from this dictionary.
  • "RemoveAll()": Method to remove all pairs of keys and values from this dictionary.
  • "Item(key)": Property to set or return the value associated with the specified key.
  • "Count": Property to return the number of pairs of keys and values.

Here is a sample ASP page to show how to use "Dictionary" class:

<script language="vbscript" runat="server">
'  dictrionary_test.asp
'  Copyright (c) 1999 by Dr. Herong Yang
'  This program shows how to use the Dictionary class.
'
   response.write("<html><body>")
   response.write("<b>Tests on dictionary class</b>:<br/>")
   ' Creating a dictionary object
   set user = CreateObject("Scripting.Dictionary")
   ' Adding a pair of key and item
   user.add "FirstName", "Bill"
   user.add "LastName", "Smith"
   user.add "Email", "bill@com.com"
   user.add "Country", "Canada"
   ' Iterating through the dictionary
   n = user.Count
   response.write("Before - Number of keys: " & n & "<br/>")
   keys = user.Keys()
   for i=0 to n-1
      k = keys(i)
      v = user.Item(k)
      response.write(k & ": " & v & "<br/>")
   next
   ' Modifying the dictionary
   user.remove("Country")
   user.Item("Email") = "bill@smith.com"
   user.Item("Phone") = "123-456-7890"
   ' Iterating through the dictionary
   response.write("After - Number of keys: " & n & "<br/>")
   keys = user.Keys()
   for i=0 to n-1
      k = keys(i)
      v = user.Item(k)
      response.write(k & ": " & v & "<br/>")
   next
   response.write("</body></html>")
</script>

Output:

Tests on dictionary class:
Before - Number of keys: 4
FirstName: Bill
LastName: Smith
Email: bill@com.com
Country: Canada
After - Number of keys: 4
FirstName: Bill
LastName: Smith
Email: bill@smith.com
Phone: 123-456-7890

Note that:

  • "CreateObject()" method is called to instantiate an object out of the "dictionary" class.
  • Method with two parameters can not use parenthesis to list the parameters, for example, 'user.Add "FirstName", "Bill"'. This is a very strange syntax for experienced programmers, because all most every other language requires parenthesis, no matter how many parameters there are in a method call.
  • Property "Item(key)" can be used on the left hand side of an assignment operator, for example, 'user.Item("Email") = "bill@smith.com"'.
  • Property "Item(key)" used an assignment statement will force an auto-addition of the specified key to this dictionary, for example, 'user.Item("Phone") = "123-456-7890"'.

"FileSystemObject" Class

FileSystemObject: A class representing the file system of the operating system where the Web server is running. Major methods and properties include:

(Continued on next part...)

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Dr. Herong Yang, updated in 2002
ASP Tutorials - Herong's Tutorial Notes - Microsoft Scripting Runtime DLL