Visual Basic 2005 in a Nutshell (In a Nutshell (OReilly))

2017-07-07 02:10:07

Asc, AscW Functions

Class

Microsoft.VisualBasic.Strings

Syntax

Dim result As Integer = Asc(string) Dim result As Integer = AscW(string)

string (required; String or Char): Any expression that evaluates to a non-empty string

Description

The Asc and AscW functions return the character code for the first character of the string passed to them. All other characters in the string are ignored. The range for the returned value is 0 to 255 on Single Byte Character Set values, and 32768 to 32767 on Double Byte Character Set values. The AscW version always uses the larger range.

Usage at a Glance

The Asc version uses the active code page of the current thread; the AscW function always uses the general Unicode character set.

Example

Dim charCode As Integer If Len(sampleString) > 0 Then charCode = Asc(sampleString) If (charCode < Asc("A")) Or (charCode > Asc("Z")) Then MsgBox("The first character must be uppercase.") End If End If