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Q142830: BUG: Gauge OCX Has Problems with 256-Color Bitmaps

Article: Q142830
Product(s): Microsoft Visual Basic for Windows
Version(s): WINDOWS:4.0
Operating System(s): 
Keyword(s): kbCtrl kbVBp kbVBp400bug kbGrpDSVB kbDSupport
Last Modified: 11-JAN-2001

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The information in this article applies to:

- Microsoft Visual Basic Standard Edition, 32-bit, for Windows, version 4.0 
- Microsoft Visual Basic Professional Edition, 16-bit, for Windows, version 4.0 
- Microsoft Visual Basic Professional Edition, 32-bit, for Windows, version 4.0 
- Microsoft Visual Basic Enterprise Edition, 16-bit, for Windows, version 4.0 
- Microsoft Visual Basic Enterprise Edition, 32-bit, for Windows, version 4.0 
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SYMPTOMS
========

Although both the 16- and 32-bit versions of the Gauge OCX allow you to specify
a 256-color bitmap for the Picture property, in many cases this bitmap is not
displayed correctly.

STATUS
======

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

MORE INFORMATION
================

This problem also occurs when running a video driver with a color depth of more
than 256 colors.

Steps to Reproduce
------------------

1. Start Visual Basic, or if it is already running, choose New Project from the
  File menu.

2. If the Gauge OCX is not in the Toolbox, right click on the Toolbox and select
  'Custom Controls' from the pop-up menu. In the Custom Controls dialog box,
  double click on the entry labeled 'MicroHelp Gauge Control' and click OK to
  add the Gauge control.

3. Click and drag a new Gauge control onto the form.

4. Double-click the gauge's Picture property and set it to a 256 color bitmap.
  With Windows 3.x or Windows NT, bitmaps called 256color.bmp or Winnt256.bmp
  exist in the Windows directory. Windows 98 contains Setup.bmp in the Windows
  directory.

  No corresponding 256 color bitmap comes with Windows 95; however, many bitmaps
  of this nature are included in Microsoft Plus! for Windows 95 or Windows 98
  as well as with different third-party software programs. In some cases
  changing the Picture property is all it takes to replicate the problem. The
  bitmap will not display correctly on the form.

  If the bitmap displays correctly initially, running the program and switching
  between different applications and the desktop will demonstrate the problem.

Additional query words:

======================================================================
Keywords          : kbCtrl kbVBp kbVBp400bug kbGrpDSVB kbDSupport 
Technology        : kbVBSearch kbAudDeveloper kbVB400Search kbVB400 kbVB16bitSearch
Version           : WINDOWS:4.0
Issue type        : kbbug
Solution Type     : kbpending

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