KB171812 - FIX: Run-Time Error When DataObject Passed as Object

Article ID: 171812

Article Last Modified on 2/24/2004

APPLIES TO

Microsoft Visual Basic 5.0 Learning Edition
Microsoft Visual Basic 5.0 Professional Edition
Microsoft Visual Basic 5.0 Enterprise Edition

This article was previously published under Q171812

SYMPTOMS

When you pass a DataObject as an Object to another procedure, you receive one of the following errors:

Run-time error '-2147417848 (80010108)':
Method 'GetFormat' of object 'IVBDataObject' failed

- or -

Run-time error '-2147319765 (8002802b)':
Automation Error

RESOLUTION

This problem is corrected with Microsoft Visual Studio 97 Service Pack 2.

You may also work around this issue by obtaining the correct interface to the DataObject that contains the GetFormat method. The example below illustrates this workaround. In this example, the DataObject is passed to a subroutine as an Object and is then set to a variable of type MSFlexGridLib.DataObject:

   Private Sub MSFlexGrid1_OLEDragDrop( _
      Data As msflexgridlib.DataObject, Effect As Long, Button As _
      Integer, Shift As Integer, x As Single, y As Single)
      PrintIt Data
   End Sub

   Sub PrintIt(d As Object)
       Dim iDataObject As MSFlexGridLib.DataObject
       Set iDataObject = d
       Debug.Print iDataObject.GetFormat(vbCFText)
   End Sub

This method allows you to communicate directly with the DataObject interface of the Object that is passed to the PrintIt procedure.

STATUS

Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article. This bug has been fixed in Visual Studio 97 Service Pack 2.

For more information on the Visual Studio 97 Service Pack 2, please see the following article in the Microsoft Knowledge Base:

170365 : INFO: Visual Studio 97 Service Packs - What, Where, and Why

For a list of the Visual Basic 5.0 bugs that were fixed in the Visual Studio 97 Service Pack 2, please see the following article in the Microsoft Knowledge Base:

171554 : INFO: Visual Basic 5.0 Fixes in Visual Studio 97 Service Pack 2

MORE INFORMATION

This error may occur with ActiveX controls that support OLE drag-and-drop. The error does not occur with intrinsic controls.

The following list contains some ActiveX controls that exhibit this problem:

   Animation
   FlexGrid
   ListView
   Masked EditBox
   Progress Bar
   Rich TextBox
   Slider
   SSTab
   StatusBar
   TabStrip
   Toolbar
   TreeView
   UpDown

Steps to Reproduce Behavior

Open a new "Standard EXE" project.
Click Components on the Project menu. Check "Microsoft FlexGrid Control 5.0."
Add a TextBox to Form1. Set the OLEDragMode property to 1-Automatic and the OLEDropMode to 1-Manual.
Add a FlexGrid to Form1. Set the OLEDropMode to 1-flexOLEDropManual.

Add the following code to Form1:

      Private Sub MSFlexGrid1_OLEDragDrop( _
         Data As msflexgridlib.DataObject, Effect As Long, Button As _
         Integer, Shift As Integer, x As Single, y As Single)
         PrintIt Data
      End Sub

      Sub PrintIt(d As Object)
         Debug.Print d.GetFormat(vbCFText)
      End Sub

      Private Sub Text1_OLEDragDrop(Data As DataObject, Effect As Long, _
         Button As Integer, Shift As Integer, x As Single, y As Single)
         PrintIt Data
      End Sub

Press the F5 key to run the application.
Highlight the text in the TextBox, then drag-and-drop it on top of itself. As expected, "True" is printed to the Immediate window.
Highlight the text in the TextBox, then drag-and-drop it on top of the FlexGrid. You receive the following error:

Run-time error '-2147417848 (80010108)':
Method 'GetFormat' of object 'IVBDataObject' failed

Keywords: kbbug kbfix kbvbp500sp2fix kbvs97sp2fix KB171812