vb.net 教程 4-7 文本文件编码 2
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2024-01-19 15:36:10
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本节将用一个简单的例子来说明文本编码:
窗体设计如下:
comboBox中的数据:
请引用 System.Text
Imports System.Text
当按下“生成”按钮时的代码:
Private Sub btnChange_Click(sender As Object, e As EventArgs) Handles btnChange.Click
Dim enc As Encoding
Select Case cbEncode.Text
Case "ASCII"
enc = Encoding.ASCII
Case "Unicode"
enc = Encoding.Unicode
Case "UTF32"
enc = Encoding.UTF32
Case "UTF7"
enc = Encoding.UTF7
Case "UTF8"
enc = Encoding.UTF8
Case "GB2312"
enc = Encoding.GetEncoding("gb2312")
Case "big5"
enc = Encoding.GetEncoding("big5")
End Select
Dim byteSource() As Byte = enc.GetBytes(txtSource.Text)
Dim strEnc As String = ""
For i As Integer = 0 To byteSource.Length - 1
strEnc &= Convert.ToString(byteSource(i), 16).ToUpper & " "
Next
txtDest.Text &= "编码方式:" & enc.EncodingName & "编码结果:" & strEnc & vbCrLf
End Sub
运行结果:
可以看到ASCII不支持繁体 "無" 字,返回的是3F(十进制:63),查找ASCII表,可知,返回的是“?”。
同样,Big5不支持简体的“无”字,返回的也是3F。
简单的测试将字节数组编码成字符:
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Dim byteSource() As Byte
ReDim byteSource(1)
'無
byteSource(0) = 181 '=>B5
byteSource(1) = 76 '=>4C
Dim enc As Encoding
enc = Encoding.GetEncoding("big5")
Dim strDest As String
strDest = enc.GetString(byteSource)
txtSource.Text = strDest
End Sub
由于.net平台下C#和vb.NET很相似,本文也可以为C#爱好者提供参考。
学习更多vb.net知识,请参看 vb.net 教程 目录
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