BUG: Setting Focus to a Masked Edit Control Causes Error (150186)


The information in this article applies to:

  • Microsoft Visual Basic Learning Edition for Windows 5.0
  • Microsoft Visual Basic Learning Edition for Windows 6.0
  • Microsoft Visual Basic Professional Edition for Windows 5.0
  • Microsoft Visual Basic Professional Edition for Windows 6.0
  • Microsoft Visual Basic Enterprise Edition for Windows 5.0
  • Microsoft Visual Basic Enterprise Edition for Windows 6.0
  • Microsoft Visual Basic Standard Edition, 32-bit, for Windows 4.0
  • Microsoft Visual Basic Professional Edition, 32-bit, for Windows 4.0
  • Microsoft Visual Basic Enterprise Edition, 32-bit, for Windows 4.0
This article was previously published under Q150186

SYMPTOMS

Setting focus to a Masked Edit control, which previously did not have the focus, triggers the ValidationError event of the control. If the Masked Edit control loses the focus, the ValidationError event is fired again.

The InValidText parameter received in the event represents the invalid characters that the user tried to type. When the event is fired erroneously because the control receives focus, the InValidText parameter is one character long, and becomes the same as the PromptChar. The example below avoids warning the user if a control is used to set focus to the control: 
   Private Sub MaskEdBox1_ValidationError(InvalidText As String, _
   
   StartPosition As Integer)
    
   If Mid$(InvalidText, StartPosition + 1, 1) <> MaskEdBox1.PromptChar Then
        
   MsgBox "You are typing in the wrong stuff"
   
   End If
   
   End Sub

STATUS

Microsoft has confirmed that this is a bug in the Microsoft products that are listed at the beginning of this article.

MORE INFORMATION

Steps to Reproduce Problem

  1. Start a new project in Visual Basic. Form1 is created by default. Place a Masked Edit control and a Command button on to Form1.
  2. Switch to the Properties window for the Masked Edit control, and change the Mask to #.
  3. In the Click event for the Command button, place the following code: 
       Private Sub Command1_Click()

   MaskEdBox1.SetFocus

   End Sub
  4. In the ValidationError event for the Masked Edit control, enter the following code: 
       Private Sub MaskEdBox1_ValidationError(InvalidText As String, _

   StartPosition As Integer)

       MsgBox "You are typing in the wrong stuff"

   End Sub
  5. Run the project by clicking F5. Click on the Command button and the Msgbox indicates that the ValidationError event was incorrectly fired.
To correct the problem with the workaround earlier, change the code in the ValidationError event to: 
   
   Private Sub MaskEdBox1_ValidationError(InvalidText As String, _
   
   StartPosition As Integer)
   
   If Mid$(InvalidText, StartPosition + 1, 1) <> MaskEdBox1.PromptChar Then
        
   MsgBox "You are typing in the wrong stuff"
   
   End If
   
   End Sub
Modification Type:MinorLast Reviewed:3/14/2005
Keywords:kbBug kbControl kbpending KB150186
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