本文整理匯總了VB.NET中System.Text.UTF32Encoding.GetPreamble方法的典型用法代碼示例。如果您正苦於以下問題：VB.NET UTF32Encoding.GetPreamble方法的具體用法？VB.NET UTF32Encoding.GetPreamble怎麽用？VB.NET UTF32Encoding.GetPreamble使用的例子？那麽, 這裏精選的方法代碼示例或許可以為您提供幫助。您也可以進一步了解該方法所在類System.Text.UTF32Encoding的用法示例。
在下文中一共展示了UTF32Encoding.GetPreamble方法的2個代碼示例，這些例子默認根據受歡迎程度排序。您可以為喜歡或者感覺有用的代碼點讚，您的評價將有助於係統推薦出更棒的VB.NET代碼示例。
示例1: Main
' 導入命名空間
Imports System.Text
Public Class SamplesUTF32Encoding
Public Shared Sub Main()
' Create instances of UTF32Encoding, with the byte order mark and without.
Dim u32LeNone As New UTF32Encoding()
Dim u32BeNone As New UTF32Encoding(True, False)
Dim u32LeBom As New UTF32Encoding(False, True)
Dim u32BeBom As New UTF32Encoding(True, True)
' Display the preamble for each instance.
PrintHexBytes(u32LeNone.GetPreamble())
PrintHexBytes(u32BeNone.GetPreamble())
PrintHexBytes(u32LeBom.GetPreamble())
PrintHexBytes(u32BeBom.GetPreamble())
End Sub
Public Shared Sub PrintHexBytes(bytes() As Byte)
If bytes Is Nothing OrElse bytes.Length = 0 Then
Console.WriteLine("<none>")
Else
Dim i As Integer
For i = 0 To bytes.Length - 1
Console.Write("{0:X2} ", bytes(i))
Next i
Console.WriteLine()
End If
End Sub
End Class輸出：
FF FE 00 00 FF FE 00 00 00 00 FE FF
示例2: Example
' 導入命名空間
Imports System.IO
Imports System.Text
Module Example
Public Sub Main()
Dim s As String = "This is a string to write to a file using UTF-32 encoding."
' Write a file using the default constructor without a BOM.
Dim enc As New UTF32Encoding(Not BitConverter.IsLittleEndian, False)
Dim bytes() As Byte = enc.GetBytes(s)
WriteToFile("NoPreamble.txt", enc, bytes)
' Use BOM.
enc = New UTF32Encoding(Not BitConverter.IsLittleEndian, True)
WriteToFile("Preamble.txt", enc, bytes)
End Sub
Private Sub WriteToFile(fn As String, enc As Encoding, bytes As Byte())
Dim fs As New FileStream(fn, FileMode.Create)
Dim preamble() As Byte = enc.GetPreamble()
fs.Write(preamble, 0, preamble.Length)
Console.WriteLine("Preamble has {0} bytes", preamble.Length)
fs.Write(bytes, 0, bytes.Length)
Console.WriteLine("Wrote {0} bytes to {1}.", fs.Length, fn)
fs.Close()
Console.WriteLine()
End Sub
End Module輸出：
Preamble has 0 bytes Wrote 232 bytes to NoPreamble.txt. Preamble has 4 bytes Wrote 236 bytes to Preamble.txt.