Microsoft KB Archive/153025

Knowledge Base

FIX: Microsoft Excel 95 Doesn't Respond Correctly to GetObject

Article ID: 153025

Article Last Modified on 8/17/2005

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APPLIES TO

• Microsoft Visual Basic 4.0 Standard Edition
• Microsoft Visual Basic 4.0 Professional Edition
• Microsoft Visual Basic 4.0 32-Bit Enterprise Edition
• Microsoft Excel 95 Standard Edition

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This article was previously published under Q153025

SYMPTOMS

Attempting to use the GetObject function to return a reference to a running instance of Microsoft Excel 95 results in the error 429:

   "OLE Automation server can't create object."
                

The identical code works correctly with a running instance of Microsoft Excel 5.0.

CAUSE

Microsoft Excel 95 fails to correctly register itself in the Running Object Table. The GetObject function can be used with the correct syntax to obtain a currently running instance of Microsoft Excel 95 for use with OLE automation.

Microsoft Excel 95 requires one additional step to ensure that it will respond to the OLE request. The code outlined below uses the SendMessage API to tell Microsoft Excel 95 to listen for requests for objects.

RESOLUTION

To work around this problem, follow these steps:

1. Add a single code module to the current project. Alternatively, if a code module already exists, it can be used instead.

2. Add the following code to the code module referred to in step 1: Const WM_USER = 1024

         Declare Function FindWindow Lib "user32" Alias "FindWindowA"_
         (ByVal lpClassName As String, ByVal lpWindowName As Long) As Long
         Declare Function SendMessage Lib "user32" Alias "SendMessageA" _
         (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, _
         lParam As Long)
         As Long
   
         Sub WakeExcel()
              Dim hwnd As Long
   
              hwnd = FindWindow("XLMAIN", 0)
              If hwnd = 0 Then
                 'no instances running
                 Exit Sub
              End If
              SendMessage hwnd, WM_USER + 18, 0, 0
         End Sub
                           

3. Add a call to the WakeExcel function so that it is called after a user may have started Microsoft Excel, but before the call to GetObject is made.

STATUS

Microsoft has confirmed this to be a bug in Microsoft Excel 95. This bug has been fixed in Microsoft Excel 97.

MORE INFORMATION

Steps to Reproduce Problem

1. Start a new instance of Visual Basic 4.0. Form1 is created by default.

2. Add the following code to the Form_Click event of Form1:

         Private Sub Form_Click()
             Dim o As Object
   
             Set o = GetObject(, "Excel.Application")
             Set o = Nothing
         End Sub
                           

3. Ensure that Microsoft Excel 95 is running.
4. Press the F5 key to run the application. Click the form once, and note the error outlined above.

REFERENCES

For additional information, please see the following articles in the Microsoft Knowledge Base:

288902 INFO: GetObject and CreateObject Behavior of Office Automation Servers

138723 XL7: Code to Access MS Excel Does Not Work in Version 7.0

Additional query words: GetActiveObject

Keywords: kberrmsg kbbug kbfix kbprogramming KB153025

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