VB 中文转utf-8的函数 ,应用于搜索引擎

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Public Function UTF8Encode(ByRef szString As String) As String
Dim szChar As String
Dim szTemp As String
Dim szCode As String
Dim szHex As String
Dim szBin As String
Dim iCount1 As Integer
Dim iCount2 As Integer
Dim iStrLen1 As Integer
Dim iStrLen2 As Integer
Dim lResult As Long
Dim lAscVal As Long
szString = Trim$(szString)
iStrLen1 = Len(szString)
For iCount1 = 1 To iStrLen1
szChar = Mid$(szString, iCount1, 1)
lAscVal = AscW(szChar)
If lAscVal >= &H0 And lAscVal <= &HFF Then
If (lAscVal >= &H30 And lAscVal <= &H39) Or _
(lAscVal >= &H41 And lAscVal <= &H5A) Or _
(lAscVal >= &H61 And lAscVal <= &H7A) Then
szCode = szCode & szChar
Else
szCode = szCode & "%" & Hex(AscW(szChar))
End If
Else
szHex = Hex(AscW(szChar))
iStrLen2 = Len(szHex)
For iCount2 = 1 To iStrLen2
szChar = Mid$(szHex, iCount2, 1)
Select Case szChar
Case Is = "0"
szBin = szBin & "0000"
Case Is = "1"
szBin = szBin & "0001"
Case Is = "2"
szBin = szBin & "0010"
Case Is = "3"
szBin = szBin & "0011"
Case Is = "4"
szBin = szBin & "0100"
Case Is = "5"
szBin = szBin & "0101"
Case Is = "6"
szBin = szBin & "0110"
Case Is = "7"
szBin = szBin & "0111"
Case Is = "8"
szBin = szBin & "1000"
Case Is = "9"
szBin = szBin & "1001"
Case Is = "A"
szBin = szBin & "1010"
Case Is = "B"
szBin = szBin & "1011"
Case Is = "C"
szBin = szBin & "1100"
Case Is = "D"
szBin = szBin & "1101"
Case Is = "E"
szBin = szBin & "1110"
Case Is = "F"
szBin = szBin & "1111"
Case Else
End Select
Next iCount2
szTemp = "1110" & Left$(szBin, 4) & "10" & Mid$(szBin, 5, 6) & "10" & Right$(szBin, 6)
For iCount2 = 1 To 24
If Mid$(szTemp, iCount2, 1) = "1" Then
lResult = lResult + 1 * 2 ^ (24 - iCount2)
Else
lResult = lResult + 0 * 2 ^ (24 - iCount2)
End If
Next iCount2
szTemp = Hex(lResult)
szCode = szCode & "%" & Left$(szTemp, 2) & "%" & Mid$(szTemp, 3, 2) & "%" & Right$(szTemp, 2)
End If
szBin = vbNullString
lResult = 0
Next iCount1
UTF8Encode = szCode
End Function