本文整理汇总了VB.NET中System.Text.UTF32Encoding.GetPreamble方法的典型用法代码示例。如果您正苦于以下问题：VB.NET UTF32Encoding.GetPreamble方法的具体用法？VB.NET UTF32Encoding.GetPreamble怎么用？VB.NET UTF32Encoding.GetPreamble使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类System.Text.UTF32Encoding的用法示例。
在下文中一共展示了UTF32Encoding.GetPreamble方法的2个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的VB.NET代码示例。
示例1: Main
' 导入命名空间
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输出：
FF FE 00 00 FF FE 00 00 00 00 FE FF
示例2: Example
' 导入命名空间
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输出：
Preamble has 0 bytes Wrote 232 bytes to NoPreamble.txt. Preamble has 4 bytes Wrote 236 bytes to Preamble.txt.