Imports System.Text

Public Class publicMode
    ''' <summary>
    ''' 将字符串转换为 Unicode 编码并交换字符位置
    ''' </summary>
    ''' <param name="inputString"></param>
    ''' <returns></returns>
    Shared Function SwapAndPad(inputString As String) As String
        Dim sb As New StringBuilder()
        Dim length As Integer = inputString.Length

        ' 处理字符串长度为奇数的情况，在末尾添加一个"F"
        If length Mod 2 <> 0 Then
            inputString &= "F"
            length += 1
        End If

        ' 每两个字符进行交换
        For i As Integer = 0 To length - 1 Step 2
            ' 交换位置：先放第二个字符，再放第一个字符
            sb.Append(inputString(i + 1))
            sb.Append(inputString(i))
        Next

        Return sb.ToString()
    End Function


    ''' <summary>
    ''' 将字符串转换为 Unicode 编码
    ''' </summary>
    ''' <param name="inputString"></param>
    ''' <returns></returns>
    Shared Function ConvertToUnicode(inputString As String) As String
        Dim sb As New StringBuilder()
        Dim maxint As Integer = 0
        For Each c As Char In inputString
            If maxint < 62 Then
                sb.Append(String.Format("\u{0:X4}", CInt(AscW(c))))
            End If
            ' 将每个字符转换为 \uXXXX 格式的 Unicode 码
            maxint += 1
        Next

        Return sb.ToString().Replace("\u", "").Trim
    End Function
    '字符串转byte数组
    Public Shared Function StringToByte(ByVal str As String) As Byte()
        Return System.Text.Encoding.Default.GetBytes(str)
    End Function

    Public Shared Function StringToHexString(ByVal b As String) As String
        Dim sbuff = StringToByte(b)
        Return ByteToHex(sbuff)
    End Function

    'byte数组转字符串
    Public Shared Function ByteToString(ByVal b As Byte()) As String
        Return System.Text.Encoding.Default.GetString(b)
    End Function

    'byte数组转十六进制字符串
    Public Shared Function ByteToHex(ByVal b As Byte()) As String
        Dim s As String = ""
        For Each c As Byte In b
            s += c.ToString("X2")
        Next
        Return s
    End Function
    '字符串转十六进制字符串不足两位补0
    Public Shared Function StringToHex(ByVal str As String) As String
        Dim s As String = ""
        For Each c As Char In str
            s += Convert.ToString(Asc(c), 16).PadLeft(2, "0")
        Next
        Return s
    End Function
    '字符串每两个字节转十六进制字符串 不足两位补0
    Public Shared Function StringToHex2(ByVal str As String) As String
        Dim s As String = ""
        Dim nv As String = ""
        For i As Integer = 0 To str.Length - 1 Step 2
            nv = str.Substring(i, 1)
            If nv.Length = 1 Then
                nv = "0" & nv
            End If
            s += nv
        Next
        Return s
    End Function



    Public Shared Function StringToHex3(ByVal str As String) As String
        Dim result As String = ""
        For Each c As Char In str
            Dim bytes As Byte() = System.Text.Encoding.Unicode.GetBytes(c)
            For Each b As Byte In bytes
                result += b.ToString("X2")
            Next
        Next
        Return result
    End Function
    '十六进制字符串转byte数组
    Public Shared Function HexToByte(ByVal hex As String) As Byte()
        Dim b As Byte() = New Byte(hex.Length / 2 - 1) {}
        Try
            For i As Integer = 0 To hex.Length - 1 Step 2
                b(i / 2) = Convert.ToByte(hex.Substring(i, 2), 16)
            Next
        Catch ex As Exception
            Return Nothing
        End Try


        Return b
    End Function

    '十六进制字符串转字符串
    Public Shared Function ByteToHexString(databuff() As Byte) As String
        Dim strData As String = String.Empty
        For i = 0 To databuff.Length - 1
            strData &= $" {Hex(databuff(i)).PadLeft(2, "0"c)}"
        Next
        Return strData
    End Function
    '十六进制字符串转字符串
    Public Shared Function HexStringToByte(hexstr As String) As Byte()
        Dim result As Byte() = Nothing
        '判断字符串是否为空或  者为空字符串
        If String.IsNullOrEmpty(hexstr) Then Return Nothing
        '替换字符中的分隔符号
        hexstr = hexstr.Trim().Replace(" ", "").Replace("-", "").Replace(",", "").Replace(":", "").Replace(";", "").Replace(".", "")
        '判断字符串的长度是否为偶数
        If hexstr.Length Mod 2 <> 0 Then
            '不为偶数往最后一个字节前面补0
            hexstr = hexstr.Insert(hexstr.Length - 1, "0")
        End If
        '以2为步长，将字符串转换为字节数组 不足2位前面补0
        Try
            result = Enumerable.Range(0, hexstr.Length).Where(Function(x) x Mod 2 = 0).Select(Function(x) Convert.ToByte(hexstr.Substring(x, 2), 16)).ToArray()
        Catch ex As Exception
            result = Nothing
        End Try

        Return result
    End Function
    'Public Shared Function HexStringToByte(hexstr As String) As String
    '    '判断字符串是否为空或  者为空字符串
    '    If String.IsNullOrEmpty(hexstr) Then Return Nothing
    '    '替换字符中的分隔符号
    '    hexstr = hexstr.Trim().Replace(" ", "").Replace("-", "").Replace(",", "").Replace(":", "").Replace(";", "").Replace(".", "")
    '    '判断字符串的长度是否为偶数
    '    If hexstr.Length Mod 2 <> 0 Then
    '        '不为偶数往最后一个字节前面补0
    '        hexstr = hexstr.Insert(hexstr.Length - 1, "0")
    '    End If
    '    '以2为步长，将字符串转换为字节数组 不足2位前面补0
    '    Return hexstr 'Enumerable.Range(0, hexstr.Length).Where(Function(x) x Mod 2 = 0).Select(Function(x) Convert.ToByte(hexstr.Substring(x, 2), 16)).ToArray()

    'End Function

    ''' <summary>
    ''' Int转2个字节Byte
    ''' 高字节在前,低字节在后
    ''' </summary>
    ''' <param name="i"></param>
    ''' <returns></returns>
    Public Shared Function IntToByteHB(ByVal i As Integer) As Byte()
        Dim btemp() As Byte = {0, 0}
        Dim b() As Byte = BitConverter.GetBytes(i)
        btemp(0) = b(0)
        btemp(1) = b(1)
        Return btemp
    End Function

    ''' <summary>
    ''' Int转2个字节Byte
    ''' 高字节在前,低字节在后
    ''' </summary>
    ''' <param name="i"></param>
    ''' <returns></returns>
    Public Shared Function IntToByteLB(ByVal i As Integer) As Byte()
        Dim btemp() As Byte = {0, 0}
        Dim b() As Byte = BitConverter.GetBytes(i)
        btemp(0) = b(1)
        btemp(1) = b(0)
        Return btemp
    End Function
End Class