XL98: "Type Mismatch" Comparing String Variable to Boolean

   Dim S As String
				

   Dim S As Variant
				

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Microsoft provides programming examples for illustration only, without warranty either expressed or implied. This includes, but is not limited to, the implied warranties of merchantability or fitness for a particular purpose. This article assumes that you are familiar with the programming language that is being demonstrated and with the tools that are used to create and to 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 requirements. The following macro generates a type mismatch error in Microsoft Excel 98. However, it does not generate the error in earlier versions of Microsoft Excel:

      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
				

The previous example fails with a type mismatch error at the following line

   If S = False Then
				

because the macro compares a string variable to the Boolean value False.

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

   Application.GetOpenFileName
   Application.SaveAsFileName
   Application.InputBox
				

To avoid the type mismatch error when you compare a variable to a Boolean value that is returned by these functions, define the variable as Variant.