遍历每一个字符，看是全角还是半角的。半角的字符总数 +1，全角的字符总数 +2。
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参考：
Public Function GetByteLength(ByVal value As String) As Long
Dim i As Long = 0
For Each c As Char In value
If (c.ToString().Length = System.Text.Encoding.Default.GetByteCount(value.ToString())) Then
i = i + 1
End If
i = i + 1
Next
Return i
End Function
上面思路是正确的， 用ascw 函数也可以
private function LenC( ps as string ) as Integer
Dim n As Integer
Dim StrLen As Integer
For n = 1 To Len(Text1.Text)
If Ascw(Mid(Text1.Text, n, 1)) 256 Then
StrLen = StrLen + 2
Else
StrLen = StrLen + 1
Next n
return strLen
end function
str = "hello,everybody. " 返回false，位置0。（不含汉字和汉语标点符号）
str = "hello,ererybody。 " 返回false，位置16。（最后一个句号是汉语标点符号）
先谢过大家了！
字符编码转换吗?
1.字符与gb2312(gbk的子集)：
Public Function GBKEncode(ByVal sInput As String) As String
Dim ret_GBKEncode As String = ""
Dim i As Integer
Dim startIndex As Integer = 0
Dim endIndex As Integer
Dim x() As Byte = System.Text.Encoding.Default.GetBytes(sInput) '字符以及字符串在vb2008中都是以unicode编码存储的
endIndex = x.Length - 1
For i = startIndex To endIndex
ret_GBKEncode = "%" Hex(x(i))
Next
Return ret_GBKEncode
End Function
'GBK解码
Public Function GBKDecode(ByVal sInput As String) As String
sInput = sInput.Replace("%", "")
Dim ret_GBKDecode As String = ""
Dim sLen As Integer = sInput.Length
Dim n As Integer = sLen \ 2
Dim sBytes(0 To n - 1) As Byte
'转化为字节码
For i As Integer = 1 To n
sBytes(i - 1) = CByte("H" sInput.Substring(2 * i - 2, 2))
Next
'将字节码转化为字符串
ret_GBKDecode = System.Text.Encoding.Default.GetString(sBytes)
Return ret_GBKDecode
End Function
2.Unicode字符串为UTF-8
Imports System.Text
Public Function StringAsUtf8Bytes(ByVal strData As String) As Byte()
Dim bytes() As Byte
bytes = Encoding.UTF8.GetBytes(strData)
Return bytes
End Function
'这里可以类推出好几种。
