Private Function Utf8ToUni(B() As Byte) As String
'不使用 API，将 Utf8 转换为 Unicode
Dim BU As Long
On Error Resume Next
BU = -1: BU = UBound(B)
If BU = -1 Then Exit Function
On Error GoTo 0
Dim I As Long, K As Long, N As Long
Dim B1 As Byte, cnt As Byte
I = LBound(B)
If BU > I + 1 Then
If B(I) = 239 And B(I + 1) = 187 And B(I + 2) = 191 Then I = I + 3 '去掉前三个字符
End If
Do
If I > BU Then Exit Do
B1 = B(I)
If (B1 And &HFC) = &HFC Then
cnt = 6
ElseIf (B1 And &HF8) = &HF8 Then
cnt = 5
ElseIf (B1 And &HF0) = &HF0 Then
cnt = 4
ElseIf (B1 And &HE0) = &HE0 Then
cnt = 3
ElseIf (B1 And &HC0) = &HC0 Then
cnt = 2
Else
cnt = 1
End If
If I + cnt - 1 > BU Then Utf8ToUni = Utf8ToUni & "?": Exit Do
Select Case cnt
Case 2: N = B1 And &H1F
Case 3: N = B1 And &HF
Case 4: N = B1 And &H7
Case 5: N = B1 And &H3
Case 6: N = B1 And &H1
Case Else: Utf8ToUni = Utf8ToUni & Chr(B1): GoTo Next1
End Select
For K = 1 To cnt - 1
N = N * &H40 + (B(I + K) And &H3F)
Next
Utf8ToUni = Utf8ToUni & ChrW(N)
Next1:
I = I + cnt
Loop
End Function