DOCUMENT:Q174825  08-OCT-1997  [vbwin]
TITLE   :BUG: Accessing Image Property of PictureBox Diminishes Resources
PRODUCT :Microsoft Visual Basic for Windows
PROD/VER:WINDOWS:5.0
OPER/SYS:Win95 WINDOWS
KEYWORDS:vb5all VBKBCtrl VBKBInt VBKBStd

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The information in this article applies to:

 - Microsoft Visual Basic Learning, Professional, and Enterprise Editions
   for Windows, version 5.0
   on the following platform: Win95
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SYMPTOMS
========

Using the Image property of a PictureBox control repeatedly diminishes GDI
and System resources on Windows 95.

RESOLUTION
==========

Use the BitBlt API function to provide the same functionality as the Image
property. The following article in the Microsoft Knowledge Base provides
information about using the BitBlt API function:

   ARTICLE-ID: Q147810
   TITLE     : HOWTO: Use Windows BitBlt Function in Visual Basic
               Application

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
================

The following shows you how to create a sample project that demonstrates
this bug. The instructions assume that you have the System Resource Meter
running so you can see the effect of accessing the Image property. The
System Resource Meter is a system tool usually installed in the Accessories
program group if you select the System Resource Meter option when you
install Windows 95.

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

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

2. Add a PictureBox, Command Button, and Label control to Form1.

3. Set the Picture property of the PictureBox control to an appropriate
   bitmap file.

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

      Option Explicit
      Private Sub Command1_Click()
         Dim I as Integer
         For I = 1 to 100
            Picture1.Picture = Picture1.Image
            Label1.Caption = Trim(Str(I))
            DoEvents
         Next I
      End Sub

4. Press the F5 key to run the program. Minimize the Visual Basic IDE so
   you can see both Form1 and the System Resource meter running. Click
   Command1 and note how the GDI and System Resources diminish by about
   20 percent with the click of the CommandButton.
======================================================================
Keywords          : vb5all VBKBCtrl VBKBInt VBKBStd
Version           : WINDOWS:5.0
Platform          : Win95 WINDOWS
Issue type        : kbbug

=============================================================================

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SO THE FOREGOING LIMITATION MAY NOT APPLY.

Copyright Microsoft Corporation 1997.