Microsoft KB Archive/160161

= FIX: SPACE BAR+ARROW KEY Causes GPF When Unloading Form =

Article ID: 160161

Article Last Modified on 6/24/2004

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APPLIES TO


 * Microsoft Visual Basic 4.0 Standard Edition
 * Microsoft Visual Basic 4.0 Professional Edition
 * Microsoft Visual Basic 4.0 Professional Edition
 * Microsoft Visual Basic 4.0 16-bit Enterprise Edition
 * Microsoft Visual Basic 4.0 32-Bit Enterprise Edition

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This article was previously published under Q160161



SYMPTOMS
With a form that contains at least two controls that are capable of receiving focus, if the SPACE BAR+ARROW KEY combination is pressed while the focus is on the control whose click event contains the code "Unload Me," a General Protection Fault (GPF) will occur.



RESOLUTION
Instead of unloading the form immediately in the click event of a control, place a Timer control on the form and use it to defer this action for one millisecond using the following code: Private Sub Command1_Click '''Unload Me      Timer1.Interval = 1 End Sub

Private Sub Timer1_Timer Unload Me  End Sub



STATUS
Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article. This bug has been fixed in Visual Basic 6.0.



Steps to Reproduce Problem
 Start a new project in Visual Basic. Form1 is created by default. Place two CommandButtons, Command1 and Command2, on Form1.  Place the following code in the Command1_Click event: Private Sub Command1_Click Unload Me  End Sub  Run the project by pressing the F5 key. With the focus on Command1, press the SPACE BAR+ARROW KEY combination and note that a GFP occurs.</ol>

Additional query words: kbVBp400bug kbVBp600fix kbVBp kbdsd kbDSupport kbCtrl

Keywords: kbbug kbfix KB160161

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