BUG: VB Hangs While Automating Excel Using OLE Control

• Microsoft Visual Basic Learning, Professional, and Enterprise Editions for Windows, version 5.0
• Microsoft Excel 97 for Windows

SYMPTOMS

Your application hangs while automating Microsoft Excel 97 via the OLE control.

CAUSE

This problem occurs while automating a Microsoft Excel 97 object that is using in-place activation in an OLE control. The problem does not occur with all methods or properties. This problem has been reported with the following method/properties in the Microsoft Excel object library:

   PrintOut
   Delete

RESOLUTION

A workaround is to not activate the object while running the automation code. However, if you need to activate the object, do so in a separate window instead of using in-place activation. For example, this line activates the object in a separate window:

   OLE1.DoVerb vbOLEOpen

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

Steps to Reproduce Behavior

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

2. On the Project menu, click References, and then select the Microsoft Excel 8.0 object library.

3. Place an OLE control on Form1 and create a new Microsoft Excel worksheet. The OLE control properties should be:

         Property    Value
         -----------------
   
         Name        OLE1
   
         Class       Excel.Sheet.8
   
   

4. Place a CommandButton on Form1.

5. Copy the following code to the Code Window of Form1:

         Private Sub Command1_Click()
            Dim xlBook As Excel.Workbook
            Set xlBook = OLE1.object
            OLE1.DoVerb vbOLEShow 'or OLE1.DoVerb vbOLEUIActivate
            xlBook.Worksheets("Sheet1").Range("A1").Value = "Hello"
            xlBook.Worksheets("Sheet1").PrintOut
            Set xlBook = Nothing
         End Sub
   
   

6. On the Run menu, click Start, or press the F5 key to start the program.

7. Click the CommandButton. Visual Basic hangs after it encounters the PrintOut method. The object will be correctly printed, but Visual Basic stops responding. You must select End Task in the task list (by pressing the CTRL+ALT+DEL keys) to end the Visual Basic project and Excel. Repeat until both Excel and the Visual Basic project are removed from the task list.

8. Repeat the steps again with the code modified as follows:

         Private Sub Command1_Click()
            Dim xlBook As Excel.Workbook
            Set xlBook = OLE1.object
            OLE1.DoVerb vbOLEShow 'or OLE1.DoVerb vbOLEUIActivate
            xlBook.Worksheets("Sheet1").Range("A1").Value = "Hello"
            Command1.SetFocus 'causes deactivation of object
            xlBook.Worksheets("Sheet1").PrintOut
            OLE1.DoVerb vbOLEShow 'optional: reactivates object
            Set xlBook = Nothing
         End Sub