Q156505: PRB: Syntax Error with ActiveX Control Terminates VFP

Article: Q156505
Product(s): Microsoft FoxPro
Version(s): 5.0, 6.0
Operating System(s): 
Keyword(s): kbActiveX kbvfp500 kbvfp600
Last Modified: 04-AUG-1999

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The information in this article applies to:

- Microsoft Visual FoxPro for Windows, versions 5.0, 6.0 
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SYMPTOMS
========

The ImageList ActiveX control is used to store a set of images for use with
other ActiveX controls. When setting the Picture property of an ActiveX control
to an image in the ImageList control, the following error may occur:

  This Program has performed an illegal operation and will be shut down

CAUSE
=====

The Picture property may have been omitted from the reference to the ImageList
control.

STATUS
======

Microsoft is researching this behavior and will post new information here in the
Microsoft Knowledge Base as it becomes available.

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

The ImageList ActiveX control allows you to load all the .bmp files and .ico
files that may be needed for other ActiveX controls. You can then set the
Picture property of an ActiveX control to reference any of the images in the
ImageList control. The following command is an example of assigning the first
image to the Picture property of an ActiveX control:

     ThisForm.Olecontrol1.Object.Picture = ;
       ThisForm.Olecontrol2.Object.ListImages(1).Picture

If the Picture property is omitted from the end of the reference, the following
error message occurs:

  This Program has performed an illegal operation and will be shut down

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

The following program demonstrates the correct and incorrect way to change a
Picture Property of an ActiveX control using an image from the ImageList
control.

      ***** Start Code *****

     PUBLIC frmOcxTest
     frmOcxTest = CREATEOBJECT('Form1')
     frmOcxTest.ADDOBJECT("PicList1","PicList", ;
        "COMCTL.ImageListCtrl.1")

     * Add the Fox.bmp to the image control
     frmOcxTest.PicList1.Object.ListImages.Add ;
        (,,LoadPicture("C:\VFP50\FOX.BMP"))
     frmOcxTest.ADDOBJECT("OcxButton1","OcxButton", ;
        "Threed.SSCommand")
     frmOcxTest.OcxButton1.Caption = "Change Image Works"
     frmOcxTest.ADDOBJECT("Button1","Button")

     frmOcxTest.Show()

     DEFINE CLASS Form1 AS Form
        Top = 0
        Left = 0
        Height = 300
        Width = 300
        Name = "Form1"
        Caption = "ImageList Test"

     ENDDEFINE

     DEFINE CLASS PicList AS OLEControl
     ENDDEFINE

     DEFINE CLASS OcxButton AS OLEControl
        Top = 75
        Left = 75
        Height = 80
        Width = 150
        Visible = .T.
        PROCEDURE Click
          * This code will change the image on the ActiveX Button
          ThisForm.OcxButton1.Object.Picture = ;
            ThisForm.PicList1.Object.ListImages(1).Picture
        ENDPROC
     ENDDEFINE

     DEFINE CLASS Button AS CommandButton
        Top = 195
        Left = 75
        Height = 27
        Width = 150
        Visible = .T.
        Caption = "Change Image Fails"

        PROCEDURE Click
          * This code will cause the following error message:
          *  "This Program has performed an illegal operation and will be
          *  shut down" (There is no "Picture" reference after "ListImages".)

          ThisForm.OcxButton1.Object.Picture = ;
            ThisForm.PicList1.Object.ListImages(1)
        ENDPROC
     ENDDEFINE

     ***** End Code *****

When you run the above code, the "Change Image Works" button displays the Fox.bmp
file from the ImageList control. The "Change Image Fails" button causes an
"Invalid Page Fault" error.

In Visual FoxPro 6.0, you do not get the "Invalid Page Fault" error, instead you
get the following error message:

  Ole exception error: Exception code c0000005. OLE object may be corrupt

REFERENCES
==========

For more information on the ActiveX controls that shipped with Visual FoxPro
5.0, see Help and the Ctrlref.hlp file located in the Vfp\Ctrlhlp directory.

Additional query words:

======================================================================
Keywords          : kbActiveX kbvfp500 kbvfp600 
Technology        : kbVFPsearch kbAudDeveloper kbVFP500 kbVFP600
Version           : 5.0, 6.0

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