Public Class Form1
    Inherits System.Windows.Forms.Form

#Region " Windows 窗体设计器生成的代码 "

    Public Sub New()
        MyBase.New()

        '该调用是 Windows 窗体设计器所必需的。
        InitializeComponent()

        '在 InitializeComponent() 调用之后添加任何初始化

    End Sub

    '窗体重写 dispose 以清理组件列表。
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing Then
            If Not (components Is Nothing) Then
                components.Dispose()
            End If
        End If
        MyBase.Dispose(disposing)
    End Sub

    'Windows 窗体设计器所必需的
    Private components As System.ComponentModel.IContainer

    '注意: 以下过程是 Windows 窗体设计器所必需的
    '可以使用 Windows 窗体设计器修改此过程。
    '不要使用代码编辑器修改它。
    Friend WithEvents TextBox1 As System.Windows.Forms.TextBox
    Friend WithEvents TextBox2 As System.Windows.Forms.TextBox
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.TextBox1 = New System.Windows.Forms.TextBox
        Me.TextBox2 = New System.Windows.Forms.TextBox
        Me.SuspendLayout()
        '
        'TextBox1
        '
        Me.TextBox1.Location = New System.Drawing.Point(7, 7)
        Me.TextBox1.Multiline = True
        Me.TextBox1.Name = "TextBox1"
        Me.TextBox1.ScrollBars = System.Windows.Forms.ScrollBars.Vertical
        Me.TextBox1.Size = New System.Drawing.Size(241, 121)
        Me.TextBox1.TabIndex = 0
        Me.TextBox1.Text = ""
        '
        'TextBox2
        '
        Me.TextBox2.Location = New System.Drawing.Point(8, 136)
        Me.TextBox2.Multiline = True
        Me.TextBox2.Name = "TextBox2"
        Me.TextBox2.ScrollBars = System.Windows.Forms.ScrollBars.Vertical
        Me.TextBox2.Size = New System.Drawing.Size(241, 112)
        Me.TextBox2.TabIndex = 1
        Me.TextBox2.Text = ""
        '
        'Form1
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(256, 255)
        Me.Controls.Add(Me.TextBox2)
        Me.Controls.Add(Me.TextBox1)
        Me.Name = "Form1"
        Me.Text = "UnicodeToGB"
        Me.ResumeLayout(False)

    End Sub

#End Region

    Private Sub TextBox1_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles TextBox1.TextChanged

    End Sub

    Private Sub TextBox1_KeyDown(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles TextBox1.KeyDown
        If e.KeyCode = Keys.Escape Then
            TextBox2.Text = UnicodeToGB(TextBox1.Text)
        End If
        If e.KeyCode = Keys.F1 Then
            TextBox1.Text = ""
            TextBox2.Text = ""
        End If
    End Sub

    Private Function UnicodeToGB(ByVal strUnicode As String) As String
        Dim GBCode As String
        Dim i, j As Integer
        Dim c() As String       '临时变量
        ReDim c(strUnicode.Length / 4)     '2个字节一个中文

        For j = 0 To strUnicode.Length \ 4 - 1
            Dim d() As Char = strUnicode.ToCharArray(j * 4, 4)
            c(j) = "&H" & CType(d, String)
            c(j) = ChrW(Val(c(j)))
            GBCode += c(j)    '将最后的结果返回
        Next
        Return GBCode
    End Function

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

    End Sub
End Class