DOCUMENT:Q129872  11-JAN-2001  [vbwin]
TITLE   :PRB: Wrong Number of Arguments Error When Call Math Functions
PRODUCT :Microsoft Visual Basic for Windows
PROD/VER:WINDOWS:4.0
OPER/SYS:
KEYWORDS:kberrmsg kbprogramming kbVBp400

======================================================================
-------------------------------------------------------------------------------
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 
-------------------------------------------------------------------------------

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

=============================================================================

THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS
PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND.  MICROSOFT DISCLAIMS
ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES
OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  IN NO
EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR
ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL,
CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF
MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGES.  SOME STATES DO NOT ALLOW THE EXCLUSION
OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES
SO THE FOREGOING LIMITATION MAY NOT APPLY.

Copyright Microsoft Corporation 2001.