文本编码转换

Function URLDecode(ByVal strIn)
    URLDecode = ""
    Dim sl: sl = 1
    Dim tl: tl = 1
    Dim key: key = "%"
    Dim kl: kl = Len(key)
    sl = InStr(sl, strIn, key, 1)
    Do While sl > 0
        If (tl = 1 And sl <> 1) Or tl < sl Then
            URLDecode = URLDecode & Mid(strIn, tl, sl - tl)
        End If
        Dim hh, hi, hl
        Dim a
        Select Case UCase(Mid(strIn, sl + kl, 1))
            Case "U" 'Unicode URLEncode
                a = Mid(strIn, sl + kl + 1, 4)
                URLDecode = URLDecode & ChrW("&H" & a)
                sl = sl + 6
            Case "E" 'UTF-8 URLEncode
                hh = Mid(strIn, sl + kl, 2)
                a = Int("&H" & hh) 'ascii码
                If Abs(a) < 128 Then
                    sl = sl + 3
                    URLDecode = URLDecode & Chr(a)
                Else
                    hi = Mid(strIn, sl + 3 + kl, 2)
                    hl = Mid(strIn, sl + 6 + kl, 2)
                    a = ("&H" & hh And &HF) * 2 ^ 12 Or ("&H" & hi And &H3F) * 2 ^ 6 Or ("&H" & hl And &H3F)
                    If a < 0 Then a = a + 65536
                    URLDecode = URLDecode & ChrW(a)
                    sl = sl + 9
                End If
            Case Else 'Asc URLEncode
                hh = Mid(strIn, sl + kl, 2) '高位
                a = Int("&H" & hh) 'ascii码
                If Abs(a) < 128 Then
                    sl = sl + 3
                Else
                    hi = Mid(strIn, sl + 3 + kl, 2) '低位
                    a = Int("&H" & hh & hi) '非ascii码
                    sl = sl + 6
                End If
                URLDecode = URLDecode & Chr(a)
        End Select
        tl = sl
        sl = InStr(sl, strIn, key, 1)
    Loop
    URLDecode = URLDecode & Mid(strIn, tl)
End Function

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Function ReadUTF(ByVal FileName As String) As String  

    With CreateObject("ADODB.Stream")  

        .Type = 2    '读取文本文件  

        .Mode = 3   '读写  

        .Open  

        .LoadFromFile FileName  

        .Charset = "UTF-8"  '设定编码  

        .Position = 2  

        ReadUTF = .ReadText  

        .Close  

    End With  

End Function 

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