IsError Function

Description

Returns a value indicating whether an expression is an error value.

Syntax

IsError(expression)

The expression named argument can be any numeric expression used to indicate an error value.

Remarks

Error values are created by converting real numbers to error values using the CVErr function. The IsError function is used to determine if a numeric expression represents an error. IsError returns True if the expression argument indicates an error; otherwise, it returns False.

See Also

CVErr Function, IsArray Function, IsDate Function, IsEmpty Function, IsMissing Function, IsNull Function, IsNumeric Function, IsObject Function, TypeName Function, Variant Data Type, VarType Function.

Example

This example uses the IsError function to check if a numeric expression is an error value. The CVErr function is used to return an Error Variant from a user-defined function.

' Assume UserFunction is a user-defined function procedure that returns 
' an error value; e.g., return value assigned with the statement 
' UserFunction = CVErr(32767) where 32767 is a user-defined number.
ReturnVal = UserFunction()
MyCheck = IsError(ReturnVal)    ' Returns True.