ACC: OLE Automation Error Using Insert Method into MS Word

• Microsoft Access versions 2.0, 7.0

SYMPTOMS

Advanced: Requires expert coding, interoperability, and multiuser skills.

In OLE Automation, when you use the Insert method to insert text into a Microsoft Word for Windows document, you may receive the following error message:

In Microsoft Access version 7.0:

Invalid Use of Null

The object cannot convert one of the arguments passed to the member.

CAUSE

You are passing a null value from Microsoft Access to the OLE Server application.

RESOLUTION

In the event procedure or a custom function, add code to verify that the value sent to the OLE Server is not a null. For example, you can add the following code:

   If Not IsNull(Forms![MyForm]![MyControl) Then

      WordObj.Insert Forms![MyForm]![MyControl]

   EndIf 

MORE INFORMATION

Steps to Reproduce Behavior

1. Open an existing Microsoft Access database.



2. Create a new, blank form and save the form as MyForm.



3. Add a text box to the form and set the text box's Name property to MyControl.



4. Add a command button to the form and set the command button's Name property to MyButton.



5. Set the MyButton command button's OnClick property to the following event procedure:

   
         Dim WordObj as Object
         Set WordObj=CreateObject("Word.Basic")
         WordObj.FileNew
         WordObj.Insert CStr(Forms![MyForm]![MyControl]) 




6. View the MyForm form in Form View. Leave the text box empty and click the MyButton command button. Note that you receive the error message described in the "Symptoms" section.

REFERENCES

For more information about working with other applications using OLE automation, search for "Working Across Applications" using the Microsoft Access for Windows 95 Help Index.

Microsoft Access "Building Applications," version 2.0, Chapter 13, "Communicating with Other Applications," pages 281-297

Additional query words:

Keywords : kberrmsg kbole IntpOlea
Version : WINDOWS:2.0,7.0
Platform : WINDOWS
Issue type : kbprb