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The source code in this issue is designed for Visual Basic 5.0 and above. It could work in VB 3 or 4 if you modify the enum values to be numeric constants instead.
If you have any questions about this issue, please email us at questions@codeoftheweek.com
The module included in this issue shows how to generate a random number between any two numbers. It also provides a useful real-world example of a routine that can use the random number generator which generates random text strings.
There are two public functions in this module that you can use. RandomNumberBetween generates a random number between any two numbers (positive or negative). RandomText generates a random text string that is a certain length. Additional options on random text are what case the characters appear in (lower, upper or mixed) and whether it inserts word breaks (blank spaces) or not.
Function RandomNumberBetween(lMin As Long, lMax As Long) As Long
Function RandomText(lBytes As Long, _
Optional eChType As eCharacterTypes, _
Optional bInsertWordBreaks As Boolean = True) As String
RandomNumberBetween just returns a Long type number. RandomText returns a random string that is lBytes long.
Dim sTest As String
' Prints out 23 random lower case characters to the debug window
sTest = RandomText(23, ctLower)
Debug.Print sTest
' Prints out 76 random mixed case characters to the debug window
sTest = RandomText(76, ctMixed)
Debug.Print sTest
' Prints out 56 random upper case characters to the debug window
sTest = RandomText(56, ctUpper)
Debug.Print sTest
' Prints out 100 random upper case characters to the debug window
' without any word separators (blank spaces)
sTest = RandomText(100, ctUpper, False)
Debug.Print sTest
Just paste this source code into a module called basRandom and include it in your project.
'----------------------------------------------------------------------
'
' Module Name: basRandom
' Written By: C&D Programming Corp.
' Create Date: 10/98
' Copyright: Copyright 1998 by C&D Programming Corp. Source
' code may not be reproduced except for use in a
' compiled executable. All rights reserved. If
' you would like to reprint any or all of this
' code please email us at info@codeoftheweek.com
'----------------------------------------------------------------------
Option Explicit
Public Enum eCharacterTypes
ctUpper ' upper case only
ctLower ' lower case only
ctMixed ' mixed case
End Enum
Function RandomNumberBetween(lMin As Long, lMax As Long) As Long
RandomNumberBetween = (Rnd * (lMax - lMin)) + lMin
End Function
Function RandomText(lBytes As Long, _
Optional eChType As eCharacterTypes, _
Optional bInsertWordBreaks As Boolean = True) As String
Dim sText As String
Dim lPosCount As Long
Randomize
sText = String$(lBytes, " ")
Select Case eChType
Case ctUpper
' do loop to get upper case text. 65 is capital A, 90 is capital Z
For lPosCount = 1 To lBytes
Mid$(sText, lPosCount, 1) = Chr$(RandomNumberBetween(65, 90))
Next
Case ctLower
' do loop to get lower case text
' 97 is lowercase A, 122 is lowercase Z
For lPosCount = 1 To lBytes
Mid$(sText, lPosCount, 1) = Chr$(RandomNumberBetween(97, 122))
Next
Case ctMixed
' do loop to get mixed case text. The logic is to generate a
' random number between 1 and 2. If the number is 2 it
' generates a lowercase character otherwise it generates an
' uppercase value.
For lPosCount = 1 To lBytes
If RandomNumberBetween(1, 2) = 2 Then
Mid$(sText, lPosCount, 1) = Chr$(RandomNumberBetween(97, 122))
Else
Mid$(sText, lPosCount, 1) = Chr$(RandomNumberBetween(65, 90))
End If
Next
End Select
' If the user wants word breaks this routine will
' generate a random number from 2 to 10 to create
' words that are 2 to 10 characters long by inserting
' a blank at each random position
If bInsertWordBreaks Then
lPosCount = RandomNumberBetween(2, 10)
While lPosCount < lBytes
Mid$(sText, lPosCount, 1) = " "
lPosCount = RandomNumberBetween(2, 10) + lPosCount
Wend
End If
RandomText = sText
End Function
That concludes this issue of COTW. We hope you find the source code useful in your development.
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