BUG: Invalid Page Fault When Deleting Nodes in TreeView Control

Last reviewed: December 23, 1997
Article ID: Q178495
The information in this article applies to:
  • Microsoft Visual Basic Learning, Professional, and Enterprise Editions for Windows, version 5.0
  • Microsoft Visual Studio versions 97, 97sp1, 97sp2, 97sp3

SYMPTOMS

While attempting to delete nodes from a TreeView control, you receive an Invalid Page Fault and your Visual Basic application is terminated.

CAUSE

This problem may occur when the user clicks on the TreeView control and this action causes an event procedure to run that attempts to delete nodes from the TreeView before the TreeView gets the focus.

RESOLUTION

To correct this problem, call the DoEvents function in the MouseDown event of the TreeView Control. For example:

   Private Sub TreeView1_MouseDown(Button As Integer, Shift As Integer, _
     x As Single, y As Single)
        DoEvents
   End Sub

STATUS

Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article. We are researching this bug and will post new information here in the Microsoft Knowledge Base as it becomes available.

MORE INFORMATION

Steps to Reproduce Behavior

  1. Start a new Standard EXE project in Visual Basic. Form1 is created by default.

  2. Click Components from the Project menu and check Microsoft Windows Common Controls 5.0.

  3. Place a TreeView control and a TextBox control on Form1.

  4. Copy the following code to the Code window of Form1:

          Private Sub Form_Load()
    
             TreeView1.Nodes.Add , , "A", "A"
          End Sub
    
          Private Sub Text1_LostFocus()
             TreeView1.Nodes.Clear
          End Sub
    
    

  5. On the Run menu, click Start, or press the F5 key to start the program.

  6. Click on the TextBox so that it has the focus.

  7. Click on the "A" node in the TreeView control.

    On Windows 95, you receive the following error:

          VB5 caused an invalid page fault in module COMCTL32.DLL at
          <address>.
    

    On Windows NT, you receive the following error:

          Exception: Stack overflow in VB5.EXE
    

          -or-
    

          The exception unknown software exception (0xc00000fd) occurred in the
          application at location <address>.
    

    NOTE: You may have to repeat steps 6 and 7 several times before seeing the problem.


Additional query words: application error crash gpf ipf page fault
Keywords : vb5all
Version : WINDOWS:5.0,97,97sp1,97sp2,97sp3
Platform : WINDOWS
Issue type : kbbug


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Last reviewed: December 23, 1997
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