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Q129872: PRB: Wrong Number of Arguments Error When Call Math Functions

Article: Q129872
Product(s): Microsoft Visual Basic for Windows
Version(s): WINDOWS:4.0
Operating System(s): 
Keyword(s): kberrmsg kbprogramming kbVBp400
Last Modified: 11-JAN-2001

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The information in this article applies to:

- Microsoft Visual Basic Standard Edition, 32-bit, for Windows, version 4.0 
- Microsoft Visual Basic Professional Edition, 16-bit, for Windows, version 4.0 
- Microsoft Visual Basic Professional Edition, 32-bit, for Windows, version 4.0 
- Microsoft Visual Basic Enterprise Edition, 16-bit, for Windows, version 4.0 
- Microsoft Visual Basic Enterprise Edition, 32-bit, for Windows, version 4.0 
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SYMPTOMS
========

Adding a reference to Microsoft Excel's Type Library from Visual Basic version
4.0 and then early binding an instance of Microsoft Excel's Application Object
results in the following error message, when calling a Math function on that
object:

  Wrong number of arguments or invalid property assignment.

CAUSE
=====

All the math functions in the Microsoft Excel Type Library are typed as
receiving no arguments, but most of them do have arguments. This is displayed in
the help string for the corresponding math function in Visual Basic's Object
Browser.

RESOLUTION
==========

Use late binding with a generic object. For example, use the following code in
the Form_Click event in the "Steps to Reproduce Behavior" section of this
article:

     Dim XLApp As Object
     Set XLApp = CreateObject("excel.application")
     z = XLApp.Atan2(3, 4)
     MsgBox Str$(z)


STATUS
======

This behavior is by design.

MORE INFORMATION
================

Steps to Reproduce Behavior
---------------------------

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

2. Add the following code to the Form_Click event:

        Dim XLApp As Excel.Application
        Set XLApp = CreateObject("excel.application")
        z = XLApp.Atan2(3, 4)  ' Get an error here on wrong number of args.
        MsgBox Str$(z)

3. Choose References from the Tools menu. Select the reference for Microsoft
  Excel 5.0 Object Library, and then click the OK button.

4. Press the F5 key to Run the program. You will get an error message on the
  line that calls the Atan2 function.

Additional query words:

======================================================================
Keywords          : kberrmsg kbprogramming kbVBp400 
Technology        : kbVBSearch kbAudDeveloper kbVB400Search kbVB400 kbVB16bitSearch
Version           : WINDOWS:4.0
Issue type        : kbprb

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