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Microsoft Access VBA and VB6 Module Library

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Class: Dictionary in Category General VBA/VB6 : Abstract Data Types from Total Visual SourceBook

This class uses the Dictionary object in VBA and VB6.

Visual Basic 6 includes the Windows Scripting Host runtime component. This dynamic link library adds the ability to create and use Dictionary objects, which are similar to Collections, but are more powerful and can also be used in VBA. Unfortunately, several things are lacking in the Dictionary object, and the documentation provided with VB6 for this new object is thin at best.

This class accomplishes three things:

Works around the bugs in the version of the Windows Scripting Runtime that ships with VB6.
Provides detailed examples of how to use the Dictionary object.
Provides additional functionality such as sorting the Dictionary.

Procedure List

Procedure Name	Type	Description
(Declarations)	Declarations	Declarations and private variables for the CDictionary class.
CompareMode	Property	Get the setting of the CompareMode property. This property is used by the Exists method to find keys in the Dictionary. Use Binary mode to do exact comparison. Use Text mode to case-insensitive comparisons.
Count	Property	Get the count of objects in the Dictionary.
Dictionary	Property	Get the handle to the current Dictionary object. Use this property for direct access to the Dictionary object.
Item	Property	Get the item in the Dictionary with the specified key.
Items	Property	Get the Dictionary items as an array.
Key	Property	Get the key in the Dictionary with the specified key.
Keys	Property	Get the Dictionary keys as an array.
Class_Initialize	Initialize	Set initial values to defaults which may be overridden with property settings.
Add	Method	Adds the specified item to the Dictionary.
Exists	Method	Determine if the specified item exists in the Dictionary. Comparison is done according to the setting of the CompareMode property.
Remove	Method	Removes the specified item from the Dictionary. A runtime error occurs if the specified item does not exist.
RemoveAll	Method	Removes all items from the Dictionary.
SortDictionary	Method	Sorts the Dictionary items. This method copies all keys and items to arrays, sorts the array, removes all items from the Dictionary, and then re-populates the Dictionary with the contents of the sorted array.
DoSort	Private	Sorts the passed variant array.

Example Code for Using Class: Dictionary

' Example of CDictionary
'
' To use this example, create a new module and paste this code into it.
' Then run the procedure by putting the cursor in the procedure and pressing:
'    F5 to run it, or
'    F8 to step through it line-by-line (see the Debug menu for more options)

Private Sub Example_CDictionary()
  ' Comments: Example of the CDictionary class using the Windows Scripting Runtime component SCRRUN.DLL using VBA and VB6.
  '           See the results in the Immediate Window.

  Dim clsDictionary As CDictionary
  Dim varItems As Variant
  Dim varItem As Variant

  Set clsDictionary = New CDictionary

  clsDictionary.Add "K1", "John"
  clsDictionary.Add "K2", "Mary"
  clsDictionary.Add "K3", "Louise"

  Debug.Print "Item count: " & clsDictionary.Count

  If clsDictionary.Exists("K2") Then
    Debug.Print "Mary exists"
  Else
    Debug.Print "Mary doesn't exist"
  End If

  clsDictionary.SortDictionary True

  varItems = clsDictionary.Items
  For Each varItem In varItems
    Debug.Print "Item: " & varItem
  Next varItem

End Sub

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