by Martin Idman (6 Submissions)
Category: VB function enhancement
Compatability: Visual Basic 3.0
Difficulty: Unknown Difficulty
Date Added: Wed 3rd February 2021
Rating: 
(4 Votes)
Inputs
KeyAscii from controls keypress-event
cAllowed as a string ("N" for numbers only...)
Assumes
Put the call in a controls keypress-event
Ex: KeyAscii=CheckKeypress(KeyAscii, "N")
Will only allow the user to enter digits in a control
Code Returns
KeyAscii for pressed key if ok or nothing and a beep for not ok
API Declarations
VBcodersPublic Function CheckKeyPress(iKeyIn As Integer, cAllowed As String) As Integer
Dim cValidKeys As String
Select Case cAllowed
Case "N" ' Just numbers
cValidKeys = "1234567890" & vbCr & vbTab & vbBack
Case "N1" ' Decimal numbers
cValidKeys = "1234567890," & vbCr & vbTab & vbBack
Case "N2" ' Simple math
cValidKeys = "1234567890+-*/=," & vbCr & vbTab & vbBack
Case "C" ' Simple characterset(I'm Swedish, hence some strange ones)
cValidKeys = "ABCDEFGHIJKLMNOPQRSTUVWXYZÅÄÖAAÉEÜI- " & vbCr & vbTab & vbBack
Case "C1" ' Enhanced characterset
cValidKeys = "ABCDEFGHIJKLMNOPQRSTUVWXYZÅÄÖAAÉEÜI&#,.-/\+-*%$<>:;@!?=() " & vbCr & vbTab & vbBack
Case "C2" ' Enhanced + digits
cValidKeys = "ABCDEFGHIJKLMNOPQRSTUVWXYZÅÄÖAAÉEÜI1234567890½&#,.-/\+-*%$<>:;@!?=() " & vbCr & vbTab & vbBack
Case "M" ' Mail and WWW
cValidKeys = "ABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890-_/\~:@." & vbCr & vbTab & vbBack
Case "D" ' Date or telephonenumbers
cValidKeys = "0123456789-" & vbCr & vbTab & vbBack
End Select
If InStr(cValidKeys, UCase(Chr(iKeyIn))) Then
CheckKeyPress = iKeyIn
Else
Beep
CheckKeyPress = 0
End If
End Function
