BUG: IPF Referencing Default Property of Nonexistent Image Ctrl (197126)


The information in this article applies to:

  • Microsoft Visual Basic Learning Edition for Windows 6.0
  • Microsoft Visual Basic Professional Edition for Windows 6.0
  • Microsoft Visual Basic Enterprise Edition for Windows 6.0
This article was previously published under Q197126

SYMPTOMS

When you try to access the default property of a nonexistent Image Control in a control array in Visual Basic 6.0, an Invalid Page Fault (IPF) or application error occurs instead of a run-time error.

RESOLUTION

Specify the Picture property of the Image1(<index>).Picture explicitly, instead of depending on the default property.

STATUS

Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article.

MORE INFORMATION

Steps to Reproduce Behavior

  1. Create a new Standard EXE Project. Form1 is created by default.
  2. Place an Image Control on Form1.
  3. Set the Index Property of the Image Control to "0."
  4. Add the following code in the General Declarations section of Form1: 
          Private Sub Form_Load()
         Dim p As StdPicture
         Set p = Pic()
      End Sub

      Private Function Pic() As StdPicture
         Set Pic = Image1(1) ' NOTE THAT IMAGE1(1) DOESN'T EXIST!
      End Function
  5. Press the F8 key to start the project. Press F8 to step through the project.
  6. Close Form1.
  7. Repeat steps 5 and 6 several times to get the IPF.
  8. To avoid the page fault, specify Image1(1).Picture explicitly instead of depending on the default property. So, repeat steps 1 through 4, replacing the Pic Function with the following: 
          Private Function Pic() As StdPicture
         Set Pic = Image1(1).Picture
      End Function
  9. Run the project.
RESULT: Notice that it throws the following error as expected, because the array element specified by the index does not exist:
Run-time Error '340:
Control array element '1' doesn't exist
Modification Type:MajorLast Reviewed:5/12/2003
Keywords:kbBug kbCtrl kbpending KB197126
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