新建壹模塊名為Module_UTF8：
Option Explicit
Public m_bIsNt As Boolean
Public Declare Function WideCharToMultiByte Lib "kernel32" (ByVal CodePage As Long, ByVal dwFlags As Long, ByVal lpWideCharStr As Long, ByVal cchWideChar As Long, ByRef lpMultiByteStr As Any, ByVal cchMultiByte As Long, ByVal lpDefaultChar As String, ByVal lpUsedDefaultChar As Long) As Long
Public Declare Function MultiByteToWideChar Lib "kernel32" (ByVal CodePage As Long, ByVal dwFlags As Long, ByRef lpMultiByteStr As Any, ByVal cchMultiByte As Long, ByVal lpWideCharStr As Long, ByVal cchWideChar As Long) As Long
Public Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (lpvDest As Any, lpvSource As Any, ByVal cbCopy As Long)
Public Const CP_UTF8 = 65001
'Purpose:Convert Utf8 to Unicode
Public Function UTF8_Decode(ByVal sUTF8 As String) As String
Dim lngUtf8Size As Long
Dim strBuffer As String
Dim lngBufferSize As Long
Dim lngResult As Long
Dim bytUtf8() As Byte
Dim n As Long
If LenB(sUTF8) = 0 Then Exit Function
If m_bIsNt Then
On Error GoTo EndFunction
bytUtf8 = StrConv(sUTF8, vbFromUnicode)
lngUtf8Size = UBound(bytUtf8) + 1
On Error GoTo 0
'Set buffer for longest possible string i.e. each byte is
'ANSI, thus 1 unicode(2 bytes)for every utf-8 character.
lngBufferSize = lngUtf8Size * 2
strBuffer = String$(lngBufferSize, vbNullChar)
'Translate using code page 65001(UTF-8)
lngResult = MultiByteToWideChar(CP_UTF8, 0, bytUtf8(0), _
lngUtf8Size, StrPtr(strBuffer), lngBufferSize)
'Trim result to actual length
If lngResult Then
UTF8_Decode = Left$(strBuffer, lngResult)
End If
Else
Dim i As Long
Dim TopIndex As Long
Dim TwoBytes(1) As Byte
Dim ThreeBytes(2) As Byte
Dim AByte As Byte
Dim TStr As String
Dim BArray() As Byte
'Resume on error in case someone inputs text with accents
'that should have been encoded as UTF-8
On Error Resume Next
TopIndex = Len(sUTF8) ' Number of bytes equal TopIndex+1
If TopIndex = 0 Then Exit Function ' get out if there's nothing to convert
BArray = StrConv(sUTF8, vbFromUnicode)
i = 0 ' Initialise pointer
TopIndex = TopIndex - 1
' Iterate through the Byte Array
Do While i <= TopIndex
AByte = BArray(i)
If AByte < &H80 Then
' Normal ANSI character - use it as is
TStr = TStr & Chr$(AByte): i = i + 1 ' Increment byte array index
ElseIf AByte >= &HE0 Then 'was = &HE1 Then
' Start of 3 byte UTF-8 group for a character
' Copy 3 byte to ThreeBytes
ThreeBytes(0) = BArray(i): i = i + 1
ThreeBytes(1) = BArray(i): i = i + 1
ThreeBytes(2) = BArray(i): i = i + 1
' Convert Byte array to UTF-16 then Unicode
TStr = TStr & ChrW$((ThreeBytes(0) And &HF) * &H1000 + (ThreeBytes(1) And &H3F) * &H40 + (ThreeBytes(2) And &H3F))
ElseIf (AByte >= &HC2) And (AByte <= &HDB) Then
' Start of 2 byte UTF-8 group for a character
TwoBytes(0) = BArray(i): i = i + 1
TwoBytes(1) = BArray(i): i = i + 1
' Convert Byte array to UTF-16 then Unicode
TStr = TStr & ChrW$((TwoBytes(0) And &H1F) * &H40 + (TwoBytes(1) And &H3F))
Else
' Normal ANSI character - use it as is
TStr = TStr & Chr$(AByte): i = i + 1 ' Increment byte array index
End If
Loop
UTF8_Decode = TStr ' Return the resultant string
Erase BArray
End If
EndFunction:
End Function
'Purpose:Convert Unicode string to UTF-8.
Public Function UTF8_Encode(ByVal strUnicode As String, Optional ByVal bHTML As Boolean = True) As String
Dim i As Long
Dim TLen As Long
Dim lPtr As Long
Dim UTF16 As Long
Dim UTF8_EncodeLong As String
TLen = Len(strUnicode)
If TLen = 0 Then Exit Function
If m_bIsNt Then
Dim lngBufferSize As Long
Dim lngResult As Long
Dim bytUtf8() As Byte
'Set buffer for longest possible string.
lngBufferSize = TLen * 3 + 1
ReDim bytUtf8(lngBufferSize - 1)
'Translate using code page 65001(UTF-8).
lngResult = WideCharToMultiByte(CP_UTF8, 0, StrPtr(strUnicode), _
TLen, bytUtf8(0), lngBufferSize, vbNullString, 0)
'Trim result to actual length.
If lngResult Then
lngResult = lngResult - 1
ReDim Preserve bytUtf8(lngResult)
'CopyMemory StrPtr(UTF8_Encode), bytUtf8(0&), lngResult
UTF8_Encode = StrConv(bytUtf8, vbUnicode)
' For i = 0 To lngResult
' UTF8_Encode = UTF8_Encode & Chr$(bytUtf8(i))
' Next
End If
Else
For i = 1 To TLen
' Get UTF-16 value of Unicode character
lPtr = StrPtr(strUnicode) + ((i - 1) * 2)
CopyMemory UTF16, ByVal lPtr, 2
'Convert to UTF-8
If UTF16 < &H80 Then ' 1 UTF-8 byte
UTF8_EncodeLong = Chr$(UTF16)
ElseIf UTF16 < &H800 Then ' 2 UTF-8 bytes
UTF8_EncodeLong = Chr$(&H80 + (UTF16 And &H3F)) ' Least Significant 6 bits
UTF16 = UTF16 \ &H40 ' Shift right 6 bits
UTF8_EncodeLong = Chr$(&HC0 + (UTF16 And &H1F)) & UTF8_EncodeLong ' Use 5 remaining bits
Else ' 3 UTF-8 bytes
UTF8_EncodeLong = Chr$(&H80 + (UTF16 And &H3F)) ' Least Significant 6 bits
UTF16 = UTF16 \ &H40 ' Shift right 6 bits
UTF8_EncodeLong = Chr$(&H80 + (UTF16 And &H3F)) & UTF8_EncodeLong ' Use next 6 bits
UTF16 = UTF16 \ &H40 ' Shift right 6 bits
UTF8_EncodeLong = Chr$(&HE0 + (UTF16 And &HF)) & UTF8_EncodeLong ' Use 4 remaining bits
End If
UTF8_Encode = UTF8_Encode & UTF8_EncodeLong
Next
End If
'Substitute vbCrLf with HTML line breaks if requested.
If bHTML Then
UTF8_Encode = Replace$(UTF8_Encode, vbCrLf, "<br/>")
End If
End Function