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Visual Basic (Microsoft) Versions 5/6 FAQ

String Manipulation

Characters Validation (works with any combination) by Malchik
Posted: 2 Apr 02

Const sValidNumeric As String = "0123456789"
Const sValidFrench As String = "TOFaTG(÷v·t"

Public Enum eCaseCheck
    eUPPER = 0
    eLOWER = 1
    eBOTH = 2
End Enum

Private Sub Text1_KeyPress(KeyAscii As Integer)
    'Check with space, letters and french accents no case sensitivity
    If Not isValidChar(KeyAscii, Chr(32) + sValidLetter + sValidFrench, eBOTH) Then KeyAscii = 0
End Sub

Public Function isValidChar(KeyAscii As Integer, sValidKey As String, iCheck As eCaseCheck) As Boolean
  'Backspace or Enter
  If KeyAscii = 8 Or KeyAscii = 13 Then
    isValidChar = True
    Exit Function
  End If
  If iCheck = eLOWER Then
    isValidChar = InStr(1, LCase(sValidKey), Chr(KeyAscii)) > 0
  ElseIf iCheck = eUPPER Then
    isValidChar = InStr(1, UCase(sValidKey), Chr(KeyAscii)) > 0
    isValidChar = InStr(1, UCase(sValidKey), UCase(Chr(KeyAscii))) > 0
  End If
End Function

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