FIX: Run-Time Error When DataObject Passed as Object

• Microsoft Visual Basic Learning, Professional, and Enterprise Editions for Windows, version 5.0

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
 

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:

Q170365 : INFO: Visual Studio 97 Service Packs - What, Where, and Why

Q171554 : 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

1. Open a new "Standard EXE" project.



2. Click Components on the Project menu. Check "Microsoft FlexGrid Control 5.0."



3. Add a TextBox to Form1. Set the OLEDragMode property to 1-Automatic and the OLEDropMode to 1-Manual.



4. Add a FlexGrid to Form1. Set the OLEDropMode to 1-flexOLEDropManual.



5. 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
     




6. Press the F5 key to run the application.



7. Highlight the text in the TextBox, then drag-and-drop it on top of itself. As expected, "True" is printed to the Immediate window.



8. 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

Additional query words:

Keywords : kbVBp500 kbVS97sp2fix kbGrpVB kbvbp500sp2fix
Version : WINDOWS:5.0
Platform : WINDOWS
Issue type : kbbug