by VB-Kung-Fu (19 Submissions)
Category: Custom Controls/Forms/Menus
Compatability: Visual Basic 5.0
Difficulty: Unknown Difficulty
Originally Published: Sun 9th November 2003
Date Added: Mon 8th February 2021
Rating: 
(1 Votes)
Filters out key presses. You can choose for lower/upper case letters, numbers, punctuation and combinations of these. Useful for data entry
API Declarations
fltUpper
fltLower
fltNumber
fltPunctuation
fltUpperLower
fltUpperNumber
fltUpperPunctuation
fltUpperNumberPunctuation
fltLowerNumber
fltLowerPunctuation
fltLowerNumberPunctuation
fltNumberPunctuation
End Enum
VBcoders
' Private Sub Text1_KeyPress(KeyAscii As Integer)
' 'allows only numbers and uppercase letters
' KeyAscii = AllowKeys(KeyAscii,fltUpperNumber)
' End Sub
Public Function AllowKeys(KeyAscii As Integer, KeysToAllow As FilterConstants, Optional ShowErrMsg As Boolean) As Integer
'Note: all the filters allow the space(32) and back space keys
Dim Msg As String
Select Case KeysToAllow
Case fltLower 'allow lowercase letters only
If KeyAscii = vbKeyBack Or KeyAscii = vbKeySpace Then
AllowKeys = KeyAscii
ElseIf KeyAscii < 97 Or KeyAscii > 122 Then
AllowKeys = 0
Msg = "Only lower case letters are allowed. (E.g. 'a' but not 'A')"
Else
AllowKeys = KeyAscii
End If
Case fltUpper 'allow uppercase letters only
If KeyAscii = vbKeyBack Or KeyAscii = vbKeySpace Then
AllowKeys = KeyAscii
ElseIf KeyAscii < 65 Or KeyAscii > 90 Then
AllowKeys = 0
Msg = "Only upper case letters are allowed. (E.g. 'A' but not 'a')"
Else
AllowKeys = KeyAscii
End If
Case fltNumber 'allow numbers only.The 46 is for the decimal point
If KeyAscii = vbKeyBack Or KeyAscii = vbKeySpace Or KeyAscii = 46 Then
AllowKeys = KeyAscii
ElseIf KeyAscii < 48 Or KeyAscii > 57 Then
AllowKeys = 0
Msg = "Only digits are allowed. (E.g. '0','3' or '9')"
Else
AllowKeys = KeyAscii
End If
Case fltPunctuation 'allow punctuation keys only
Select Case KeyAscii
Case vbKeyBack
AllowKeys = KeyAscii
Case vbKeySpace
AllowKeys = KeyAscii
Case 33 To 47, 58 To 64, 91 To 96, 123 To 126
AllowKeys = KeyAscii
Case Else
AllowKeys = 0
Msg = "Only punctuatuon characters are allowed. (E.g. '?', ';' or ',')"
End Select
Case fltUpperLower 'allow upper and lowercase letters only
Select Case KeyAscii
Case vbKeyBack
AllowKeys = KeyAscii
Case vbKeySpace
AllowKeys = KeyAscii
Case 65 To 90, 97 To 122
AllowKeys = KeyAscii
Case Else
AllowKeys = 0
Msg = "Only lower case and upper case letters are allowed. (E.g. 'a','b','A' or 'B')"
End Select
Case fltUpperNumber 'allow uppercase letters and numbers only
Select Case KeyAscii
Case vbKeyBack
AllowKeys = KeyAscii
Case vbKeySpace
AllowKeys = KeyAscii
Case 65 To 90, 48 To 57
AllowKeys = KeyAscii
Case Else
AllowKeys = 0
Msg = "Only upper case letters and digits are allowed. (E.g. '0','5','A' or 'B')"
End Select
Case fltUpperPunctuation 'allow uppercase letters and punctuation only
Select Case KeyAscii
Case vbKeyBack
AllowKeys = KeyAscii
Case vbKeySpace
AllowKeys = KeyAscii
Case 65 To 90, 33 To 47, 58 To 64, 91 To 96, 123 To 126
AllowKeys = KeyAscii
Case Else
AllowKeys = 0
Msg = "Only upper case letters and punctuation characters are allowed. (E.g. '?',';','A' or 'B')"
End Select
Case fltLowerNumber 'allow lowercase letters and numbers only
Select Case KeyAscii
Case vbKeyBack
AllowKeys = KeyAscii
Case vbKeySpace
AllowKeys = KeyAscii
Case 97 To 122, 48 To 57
AllowKeys = KeyAscii
Case Else
AllowKeys = 0
Msg = "Only lower case letters and digits are allowed. (E.g. '0','5','a' or 'b')"
End Select
Case fltLowerPunctuation 'allow lowercase letters and punctuation only
Select Case KeyAscii
Case vbKeyBack
AllowKeys = KeyAscii
Case vbKeySpace
AllowKeys = KeyAscii
Case 97 To 122, 33 To 47, 58 To 64, 91 To 96, 123 To 126
AllowKeys = KeyAscii
Case Else
AllowKeys = 0
Msg = "Only lower case letters and punctuation characters are allowed. (E.g. '?',';','a' or 'b')"
End Select
Case fltNumberPunctuation 'allow numbers and punctuation only
Select Case KeyAscii
Case vbKeyBack
AllowKeys = KeyAscii
Case vbKeySpace
AllowKeys = KeyAscii
Case 48 To 57, 33 To 47, 58 To 64, 91 To 96, 123 To 126
AllowKeys = KeyAscii
Case Else
AllowKeys = 0
Msg = "Only digits and punctuation characters are allowed. (E.g. '?',';','6' or '2')"
End Select
Case fltUpperNumberPunctuation 'allow uppercase,numbers and punctuation only
Select Case KeyAscii
Case vbKeyBack
AllowKeys = KeyAscii
Case vbKeySpace
AllowKeys = KeyAscii
Case 65 To 90, 48 To 57, 33 To 47, 58 To 64, 91 To 96, 123 To 126
AllowKeys = KeyAscii
Case Else
AllowKeys = 0
Msg = "Only upper case letters, digits and punctuation characters are allowed. (E.g. '?','A' or '9')"
End Select
Case fltLowerNumberPunctuation 'allow lowercase,numbers and punctuation only
Select Case KeyAscii
Case vbKeyBack
AllowKeys = KeyAscii
Case vbKeySpace
AllowKeys = KeyAscii
Case 48 To 57, 97 To 122, 33 To 47, 58 To 64, 91 To 96, 123 To 126
AllowKeys = KeyAscii
Case Else
AllowKeys = 0
Msg = "Only lower case letters, digits and punctuation characters are allowed. (E.g. '?','a' or '9')"
End Select
End Select
If AllowKeys = 0 And ShowErrMsg = True Then
MsgBox Msg, vbInformation + vbOKOnly, "Invalid key"
End If
End Function
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