Access如何将二进制UTF8转成字符串

分享一个utf-8转字符串的函数。解决编码带来的错误！
调用方法：
Private Sub cmdConvert_Click()
fm20TxtText.Text = FromUtf8(FromHex(fm20TxtHex.Text))
End Sub

函数如下：
Private Declare Function CryptStringToBinary Lib "Crypt32" _
Alias "CryptStringToBinaryW" ( _
ByVal pszString As Long, _
ByVal cchString As Long, _
ByVal dwFlags As Long, _
ByVal pbBinary As Long, _
ByRef pcbBinary As Long, _
ByRef pdwSkip As Long, _
ByRef pdwFlags As Long) As Long

Private Declare Function MultiByteToWideChar Lib "kernel32" ( _
ByVal CodePage As Long, _
ByVal dwFlags As Long, _
ByVal lpMultiByteStr As Long, _
ByVal cchMultiByte As Long, _
ByVal lpWideCharStr As Long, _
ByVal cchWideChar As Long) As Long

Public Function FromHex(ByRef HexString As String) As Byte()
Const CRYPT_STRING_HEX As Long = &H4&
Dim lngOutLen As Long
Dim dwActualUsed As Long
Dim bytBinary() As Byte

If Len(HexString) < 1 Then Exit Function

'Determine output buffer length required.
If CryptStringToBinary(StrPtr(HexString), _
                        Len(HexString), _
                        CRYPT_STRING_HEX, _
                        0&, _
                        lngOutLen, _
                        ByVal 0&, _
                        dwActualUsed) = 0 Then
      Err.Raise &H80044100, "FromHex", _
               "CryptStringToBinary failed, error " & CStr(Err.LastDllError)
Else
      'Convert to binary.
      ReDim bytBinary(lngOutLen - 1)
      If CryptStringToBinary(StrPtr(HexString), _
                           Len(HexString), _
                           CRYPT_STRING_HEX, _
                           VarPtr(bytBinary(0)), _
                           lngOutLen, _#p#分页标题#e#
                           ByVal 0&, _
                           dwActualUsed) = 0 Then
         Err.Raise &H80044100, "FromHex", _
                  "CryptStringToBinary failed, error " & CStr(Err.LastDllError)
      Else
         FromHex = bytBinary
      End If
End If
End Function

Public Function FromUtf8(ByRef Utf8() As Byte) As String
Const CP_UTF8 As Long = 65001
Dim lngBytes As Long
Dim lngResult As Long

On Error Resume Next
lngBytes = UBound(Utf8) - LBound(Utf8) + 1
If Err Then
      Err.Clear
      On Error GoTo 0
      Err.Raise 5, "FromUtf8", "Invalid parameter: must be a dimensioned array"
End If
On Error GoTo 0
lngResult = MultiByteToWideChar(CP_UTF8, 0, VarPtr(Utf8(LBound(Utf8))), _
                                 lngBytes, 0, 0)
FromUtf8 = String$(lngResult, 0)
MultiByteToWideChar CP_UTF8, 0, VarPtr(Utf8(LBound(Utf8))), _
                     lngBytes, StrPtr(FromUtf8), lngResult
End Function

发布人:tmtony-Access中国

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点击次数：更新时间：2013-07-22 14:42:42 【打印此页】【关闭】

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