| ASCIIEncoding: GetByteCount |
Calculates the number of bytes produced by encoding the characters in the specified string or character array.
Public Function GetByteCount( ByRef Chars As Variant, Optional ByRef Index As Variant, Optional ByRef Count As Variant ) As Long
To calculate the exact array size required by GetBytes to store the resulting bytes, the application uses GetByteCount. To calculate the maximum array size, the application should use GetMaxByteCount. The GetByteCount method generally allows allocation of less memory, while the GetMaxByteCount method generally executes faster.
| Exception | Condition |
|---|---|
| ArgumentNullException | Chars is null. |
| ArgumentOutOfRangeException | Index is less than the LBound of a character array or less than zero for a string. -or- Count is less than zero. -or- Index and Count do not denote a valid range in Chars. |
| EncoderFallbackException | A fallback occurred -and- EncoderFallback is set to EncoderExceptionFallback. |
The following example demonstrates how to use the GetByteCount method to return the number of bytes required to encode an array of Unicode characters using ASCIIEncoding.
Dim s As String Dim Chars() As Integer Dim ASCII As New ASCIIEncoding Dim ByteCount As Long s = "ASCII Encoding Example" ByteCount = ASCII.GetByteCount(s) Debug.Print CorString.Format("{0} bytes needed to encode string.", ByteCount) Debug.Print Chars = NewChars(ChrW$(&H23), ChrW$(&H25), ChrW$(&H3A0), ChrW$(&H3A3)) ByteCount = ASCII.GetByteCount(Chars, 1, 2) Debug.Print CorString.Format("{0} bytes need to encode characters.", ByteCount) End Sub ' This code produces the following output. ' ' 22 bytes needed to encode string. ' ' 2 bytes need to encode characters.