XL2000: ParamArray Must Be Declared as an Array of Variant

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This article was previously published under Q213564

Symptoms

When you attempt to run a Visual Basic for Applications macro in Microsoft Excel, or while you are editing code in a Visual Basic module, you may receive the following error message:

Compile error:
ParamArray must be declared as an array of Variant

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Cause

This error will occur if you have declared a variable as a ParamArray and either of the following conditions are true:

The variable name is not immediately followed by an open and a close parenthesis, as follows:

ParamArray MyVar()

-or-
The open and close parentheses that follow the variable name are followed by "As <vartype>", where <vartype> is any variable type other than Variant.

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Resolution

Variables declared as ParamArrays must be immediately followed by an open and a close parenthesis, and must be declared either as type Variant or as no type at all. Note that if a data type is not specified, the variable will default to the Variant data type.

Making this change will allow your macros to work in all versions of Microsoft Excel that support the Visual Basic for Applications macro language.

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More information

When you write a custom Visual Basic subroutine function in Microsoft Excel, the last argument accepted by the function can be declared as a ParamArray. When you do this, the function will accept one or more values and place them in the specified variable as an array, so that they can then be used within the function. For example, if you have the following function:

Function Test(X As Integer, ParamArray Y())
    Test = "Hello"
End Function

If you enter the formula

=Test(6,7,8,9,10)

in a cell, the first argument (6) will be used as the value of the variable X. The remaining arguments (7, 8, 9, 10) will become elements in the array Y().

When you declare a variable as a ParamArray in versions of Microsoft Excel earlier than Excel 97, you can sometimes omit the open and close parentheses immediately following the variable. Specifically, if the variable is declared within a Declare statement, the parentheses may be omitted. For example:

Declare Function MyFunc Lib "XYZ.DLL" (X As String, ParamArray Y As
    Variant) As Variant

This Declare statement will work in versions of Microsoft Excel earlier than Excel 97, but it will not work in Microsoft Excel 2000. If you attempt to run any macros when this statement is present, you will receive the error message shown in the "Symptoms" section of this article.

In order for the statement to work, you must add open and close parentheses immediately after the variable name, as follows:

Declare Function MyFunc Lib "XYZ.DLL" (X As String, ParamArray Y() As
    Variant) As Variant

Also, note that ParamArrays must be declared either as type Variant or as no type at all:

   Valid ParamArrays           Invalid ParamArrays
   -----------------------------------------------------
   ParamArray A()              ParamArray C() As Integer
   ParamArray B() As Variant   ParamArray D() As Double
                               ParamArray E() As String
                               ParamArray F() As Boolean
                               ParamArray G() As Long

For additional information about ParamArrays, click the article number below to view the article in the Microsoft Knowledge Base:

213277� XL2000: Methods to Use Custom Functions with Varying Arguments

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