XL97: "Type Mismatch" Comparing String Variable to Boolean

• Microsoft Excel 97 for Windows

SYMPTOMS

In Microsoft Excel 97, when you run a macro that runs successfully in an earlier version of Microsoft Excel, the following error message may appear:

   Run-time error '13':
   Type Mismatch

CAUSE

This problem may occur when the macro compares a string variable to a Boolean variable.

In Microsoft Excel 97, a variable that you define as a string type cannot be compared to the Boolean values True or False without generating a run- time error.

WORKAROUND

To work around this problem, define the variable that you want to compare to a Boolean variable as Variant instead of String; a Variant variable can be compared to a Boolean variable without generating an error. For example, if the macro contains a line similar to the following:

   Dim S As String

   Dim S As Variant

STATUS

This behavior is by design of Microsoft Excel 97.

MORE INFORMATION

Microsoft provides programming examples for illustration only, without warranty either expressed or implied, including, but not limited to, the implied warranties of merchantability and/or fitness for a particular purpose. This article assumes that you are familiar with the programming language being demonstrated and the tools used to create and debug procedures. Microsoft support engineers can help explain the functionality of a particular procedure, but they will not modify these examples to provide added functionality or construct procedures to meet your specific needs. If you have limited programming experience, you may want to contact the Microsoft fee-based consulting line at (800) 936-5200. For more information about the support options available from Microsoft, please see the following page on the World Wide Web:

   http://www.microsoft.com/support/supportnet/refguide/default.asp

   Sub Macro()

      Dim S As String

      ' Prompt for the user's name and place the value in string 
      ' variable S.
      S = Application.InputBox("Enter Your Name:")

      ' If user clicks Cancel in the Inputbox, S is False. If S is 
      ' False, exit the procedure.
      If S = False Then
         Exit Sub
      Else
         MsgBox S
      End If

   End Sub

   If S = False Then

The following functions may return either a string or Boolean value:

   Application.GetOpenFileName
   Application.SaveAsFileName
   Application.InputBox