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Specify length of characters to be entered for password and username

I have the following code on generating log in for users,but this code doesn't specify the length for username and password,i want the code to tell the user the length required if the user types more characters than wanted for the username and password.

Private Sub Login_Click()
Dim found As Boolean
On Error GoTo ErrHandler

found = False

If (Username <> "") And (Password <> "") Then
Set db = OpenDatabase("Z:\Project\FinalProject(ExpensesMonitoringSystem).mdb")
Set rs = db.OpenRecordset("Log In")

Do While (rs!Password <> "") And (Not found)
If (rs!Username = Username.Text) And (rs!Password = Password.Text) Then
found = True
End If

End If
If found Then

Login.Visible = False
Load ExpensesMain

End If
Set rs = Nothing

Exit Sub

If Err = 3021 Then
MsgBox "Incorrect Username or Password,Try one's the system recognises..." & "Consult system administrator if having problem logging on...", vbExclamation
'vbOKCancel, 0 + 48, "Login"
'MsgBox "Consult you system administrator if having problem logging on...", vbExclamation
'MsgBox "Try another name,one the system recognises...", vbExclamation
Exit Sub
End If
End Sub

1 Solution
use the MaxLength property of the textbox
Mohammed NasmanSoftware DeveloperCommented:
use Len function

 if Len(Password) > 8 then
   msgbox "your password can't be more than 8 letters"
 end if

and when you need the max. size of a passwd or username use
Dim MaxCharofUsername
Dim MaxCharofPassword
Set db = OpenDatabase("Z:\Project\FinalProject(ExpensesMonitoringSystem).mdb")
Set rs = db.OpenRecordset("Log In")
MaxCharofUsername = rs!Username.DefinedSize
MaxCharofPassword = rs!Password.DefinedSize

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Sorry, perhaps you must access the fields in this semantic:
MaxCharofUsername = rs.Fields("Username").DefinedSize
MaxCharofPassword = rs.Fields("Password").DefinedSize
Form1.UsernameTextEdit.MaxLength  = MaxCharofUsername
Form1.PasswdTextEdit.MaxLength  = MaxCharofPassword
(like deighton says)

No need of Len() because of the functions:
CurrentCharofUsername = rs!Username.ActualSize
The best user interface is:
* Use MaxLength property to limit characters typed by user
* Add labels with text instructing user on allowed sizes of userid and password
* In the Change() event of both the UserID and PWD textboxes, add the following code.  
Note1: You can code in one procedure if the two textbox controls were members of a control array.  

My example.
Private Sub txtUIDPWD_Change(Index As Integer)
  If Len(txtUIDPWD(Index).Text) >= intMinAllowedLength Then
    cmdGenerateLogin.Enabled = True
    cmdGenerateLogin.Enabled = False
  End If
End Sub

Note2: You might also check for illegal characters before enabling the cmdGenerateLogin button.

* Add code in the KeyPress events of the textbox controls to prevent illegal characters from entering.
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Thanks everyone.
Moderator @ Experts Exchange
Hi humbk2002,
It appears that you have forgotten this question. I will ask Community Support to close it unless you finalize it within 7 days. I will ask a Community Support Moderator to:

    Split points between: deighton and mnasman

humbk2002, if you think your question was not answered at all or if you need help, just post a new comment here; Community Support will help you.  DO NOT accept this comment as an answer.

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Moving to the paq

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