BUG: SSCommand Control Generates Application Error

Last reviewed: December 15, 1995
Article ID: Q141091

The information in this article applies to:

Standard, Professional and Enterprise Editions of Microsoft Visual Basic for Windows, 16-bit and 32-bit, version 4.0

SYMPTOMS

An application error or general protection (GP) fault ending the Visual Basic design environment occurs when the Picture property of a SSCommand (3D command button) control is set to the default property of a PictureBox control located on another form, and the running application is stopped using only the End button on the Toolbar.

The bug occurs if you have a Visual Basic application containing one form with a SSCommand control and another form with a PictureBox control. The Picture property of the SSCommand control is set to the default property of the PictureBox control. The PictureBox control's default property is its Picture property.

When you run the application in the Visual Basic design environment and you click the End button on the Toolbar to stop the application, an error message displays and Visual Basic ends. Note that the Close button on the form with the SSCommand control is not clicked.

WORKAROUND

The workaround is to set the Picture property of the SSCommand control by explicitly specifying the Picture property of the PictureBox control. Do NOT use the default property of the PictureBox control to set the Picture property of the SSCommand control. An example of this is shown below in the code in the More Information section.

STATUS

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

MORE INFORMATION

The following shows you how to reproduce the bug:

Steps to Reproduce Bug

Start Visual Basic 4.0, or if it is already running, click New Project on the File menu.

Click Custom Controls on the Tools menu. Click the Sheridan 3D Controls check box in the Custom Controls dialog box. Click OK to close the dialog box.

Add a SSCommand control to the Form1 form.

Add the following code to the Form1 code window:

   Private Sub SSCommand1_Click()

      'Set the SSCommand button's Picture property to the PictureBox
      'control's default property as below:
      SSCommand1.Picture = Form2.Picture1

      'The workaround is to explicitly specify the PictureBox control's
      'Picture property. Use the following code instead:
      'SSCommand1.Picture = Form2.Picture1.Picture

   End Sub

Add a second form to your project by clicking Form in the Insert menu.

Add a PictureBox control to Form2 form.

Set the PictureBox control's Picture property to any bitmap or icon file stored on your computer as follows:

a. In the PictureBox control's Properties Window, click the button with

      an ellipsis (...) to display the Load Picture dialog box.

b. Double-click any listed bitmap (.bmp) or icon (.ico) file.

Press the F5 key or click Start on the Run menu to start the Visual Basic program. Click the Command1 button. The caption changes to bitmap graphic you selected. Click the End button in the toolbar to stop the project. An application error occurs with one of the following messages displayed and Visual Basic ends:

Windows NT 3.51:

      32-bit: An application error has occurred and an application error
              log is being generated. VB32.Exe Exception: access violation
              (oxc0000005), Address: 0x0046e951.

      16-bit: VB caused a General Protection Fault in module VB.Exe at
              0023:39FF.

   Windows 95:

      32-bit: VB32 caused an invalid page fault in module VB32.Exe at
              0137:0046e951.
      16-bit: VB caused a general protection fault in module VB.Exe at
              0023:000039ff.

   Windows (and Windows for Workgroups) 3.11:

      VB caused a General Protection Fault in module VB.Exe at 0023:39FF.

Additional reference words: 4.0 vb4win vb4all GPF buglist4.00
KBCategory: kbbuglist kbprg
KBSubcategory: PrgCtrls

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Last reviewed: December 15, 1995
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