UTF8转unicode问题
我用串口通讯，采集上面是手机名字，传上来的是UTF8字符，转换如果是两个字和四个字没问题，但如果一个字和三个字，最后面一个字是乱码请各位高手帮忙解，急代码如下
Public m_bIsNt As Boolean
Private 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
Private 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
Private Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (lpvDest As Any, lpvSource As Any, ByVal cbCopy As Long)
Private Const CP_UTF8 = 65001
'Purpose:Convert Utf8 to Unicode
Public Function UTF8_Decode(ByRef 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 String
Dim ThreeBytes(2) As String
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$(AByte): i = i + 1 ' Increment byte array index
ElseIf AByte >= &HE0 And Val(AByte) <> 255 Then 'was = &HE1 Then
'Start of 3 byte UTF-8 group for a character
'Copy 3 byte to ThreeBytes
ThreeBytes(0) = BArray(i): i = i + 1
ThreeBytes(1) = BArray(i): i = i + 1
ThreeBytes(2) = BArray(i): i = i + 1
' Convert Byte array to UTF-16 then Unicode
TStr = TStr & ChrW$((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 我也是这个问题哦
Private 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
Private 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 Long, ByVal lpUsedDefaultChar As Long) As Long
'常用的代码页：
const cpUTF8 =65001
const cpGB2312 = 936
const cpGB18030=54936
const cpUTF7 =65000
Function MultiByteToUTF16(UTF8() As Byte, CodePage As Long) As String
Dim bufSize As Long
bufSize = MultiByteToWideChar(CodePage, 0&, UTF8(0), UBound(UTF8) + 1, 0, 0)
MultiByteToUTF16 = Space(bufSize)
MultiByteToWideChar CodePage, 0&, UTF8(0), UBound(UTF8) + 1, StrPtr(MultiByteToUTF16), bufSize
End Function
Function UTF16ToMultiByte(UTF16 As String, CodePage As Long) As Byte()
Dim bufSize As Long
Dim arr() As Byte
bufSize = WideCharToMultiByte(CodePage, 0&, StrPtr(UTF16), Len(UTF16), 0, 0, 0, 0)
ReDim arr(bufSize - 1)
WideCharToMultiByte CodePage, 0&, StrPtr(UTF16), Len(UTF16), arr(0), bufSize, 0, 0
UTF16ToMultiByte = arr
End Function
Private Sub Command1_Click()
MsgBox MultiByteToUTF16(UTF16ToMultiByte("ab中,c", cpUTF8), cpUTF8)
End Sub
补充：VB , API
