Public Function Base64Encode(InStr1 As String) As String
Dim mInByte(3) As Byte, mOutByte(4) As Byte
Dim myByte As Byte
Dim i As Integer, LenArray As Integer, j As Integer
Dim myBArray() As Byte
Dim OutStr1 As String
myBArray() = StrConv(InStr1, vbFromUnicode)
LenArray = UBound(myBArray) + 1
For i = 0 To LenArray Step 3
If LenArray - i = 0 Then
Exit For
End If
If LenArray - i = 2 Then
mInByte(0) = myBArray(i)
mInByte(1) = myBArray(i + 1)
Base64EncodeByte mInByte, mOutByte, 2
ElseIf LenArray - i = 1 Then
mInByte(0) = myBArray(i)
Base64EncodeByte mInByte, mOutByte, 1
Else
mInByte(0) = myBArray(i)
mInByte(1) = myBArray(i + 1)
mInByte(2) = myBArray(i + 2)
Base64EncodeByte mInByte, mOutByte, 3
End If
For j = 0 To 3
OutStr1 = OutStr1 & Chr(mOutByte(j))
Next j
Next i
Base64Encode = OutStr1
End Function
Private Sub Base64EncodeByte(mInByte() As Byte, mOutByte() As Byte, Num As Integer)
Dim tByte As Byte
Dim i As Integer
If Num = 1 Then
mInByte(1) = 0
mInByte(2) = 0
ElseIf Num = 2 Then
mInByte(2) = 0
End If
tByte = mInByte(0) And &HFC
mOutByte(0) = tByte / 4
tByte = ((mInByte(0) And &H3) * 16) + (mInByte(1) And &HF0) / 16
mOutByte(1) = tByte
tByte = ((mInByte(1) And &HF) * 4) + ((mInByte(2) And &HC0) / 64)
mOutByte(2) = tByte
tByte = (mInByte(2) And &H3F)
mOutByte(3) = tByte
For i = 0 To 3
If mOutByte(i) > = 0 And mOutByte(i) <= 25 Then
mOutByte(i) = mOutByte(i) + Asc( "A ")
ElseIf mOutByte(i) > = 26 And mOutByte(i) <= 51 Then
mOutByte(i) = mOutByte(i) - 26 + Asc( "a ")
ElseIf mOutByte(i) > = 52 And mOutByte(i) <= 61 Then
mOutByte(i) = mOutByte(i) - 52 + Asc( "0 ")
ElseIf mOutByte(i) = 62 Then
mOutByte(i) = Asc( "+ ")
Else
mOutByte(i) = Asc( "/ ")
End If
Next i
If Num = 1 Then
mOutByte(2) = Asc( "= ")
mOutByte(3) = Asc( "= ")
ElseIf Num = 2 Then
mOutByte(3) = Asc( "= ")
End If
End Sub
Public Function Base64Decode(InStr1 As String) As String
Dim mInByte(4) As Byte, mOutByte(3) As Byte
Dim i As Integer, LenArray As Integer, j As Integer
Dim myBArray() As Byte
Dim OutStr1 As String
Dim tmpArray() As Byte
myBArray() = StrConv(InStr1, vbFromUnicode)
LenArray = UBound(myBArray)
ReDim tmpArray(((LenArray + 1) / 4) * 3)
j = 0
For i = 0 To LenArray Step 4
If LenArray - i = 0 Then
Exit For
Else
mInByte(0) = myBArray(i)
mInByte(1) = myBArray(i + 1)
mInByte(2) = myBArray(i + 2)
mInByte(3) = myBArray(i + 3)
Base64DecodeByte mInByte, mOutByte, 4
End If
tmpArray(j * 3) = mOutByte(0)
tmpArray(j * 3 + 1) = mOutByte(1)
tmpArray(j * 3 + 2) = mOutByte(2)
j = j + 1
Next i
Base64Decode = BinaryToString(tmpArray)
End Function
Private Sub Base64DecodeByte(mInByte() As Byte, mOutByte() As Byte, ByteNum As Integer)
Dim tByte As Byte
Dim i As Integer
ByteNum = 0
For i = 0 To 3
If mInByte(i) > = Asc( "A ") And mInByte(i) <= Asc( "Z ") Then
mInByte(i) = mInByte(i) - Asc( "A ")
ElseIf mInByte(i) > = Asc( "a ") And mInByte(i) <= Asc( "z ") Then
mInByte(i) = mInByte(i) - Asc( "a ") + 26
ElseIf mInByte(i) > = Asc( "0 ") And mInByte(i) <= Asc( "9 ") Then
mInByte(i) = mInByte(i) - Asc( "0 ") + 52
ElseIf mInByte(i) = Asc( "+ ") Then
mInByte(i) = 62
ElseIf mInByte(i) = Asc( "/ ") Then
mInByte(i) = 63
Else ' "= "
ByteNum = ByteNum + 1
mInByte(i) = 0
End If
Next i
'取前六位
tByte = (mInByte(0) And &H3F) * 4 + (mInByte(1) And &H30) / 16
'0的六位和1的前两位
mOutByte(0) = tByte
tByte = (mInByte(1) And &HF) * 16 + (mInByte(2) And &H3C) / 4
'1的后四位和2的前四位
mOutByte(1) = tByte
tByte = (mInByte(2) And &H3) * 64 + (mInByte(3) And &H3F)
mOutByte(2) = tByte
'2的后两位和3的六位
End Sub
Private Function BinaryToString(ByVal BinaryStr As Variant) As String '二进制转换为字符串
Dim lnglen As Long
Dim tmpBin As Variant
Dim strC As String
Dim skipflag As Long
Dim i As Long
skipflag = 0
strC = " "
If Not IsNull(BinaryStr) Then
lnglen = LenB(BinaryStr)
For i = 1 To lnglen
If skipflag = 0 Then
tmpBin = MidB(BinaryStr, i, 1)
If AscB(tmpBin) > 127 Then
strC = strC & Chr(AscW(MidB(BinaryStr, i + 1, 1) & tmpBin))
skipflag = 1
Else
strC = strC & Chr(AscB(tmpBin))
End If
Else
skipflag = 0
End If
Next
End If
BinaryToString = strC
End Function
Private Function StringToBinary(ByVal VarString As String) As Variant '字符串转成二进制
Dim strBin As Variant
Dim varchar As Variant
Dim varasc As Long
Dim varlow, varhigh
Dim i As Long
strBin = " "
For i = 1 To Len(VarString)
varchar = Mid(VarString, i, 1)
varasc = Asc(varchar)
If varasc < 0 Then
varasc = varasc + 65535
End If
If varasc > 255 Then
varlow = Left(Hex(Asc(varchar)), 2)
varhigh = Right(Hex(Asc(varchar)), 2)
strBin = strBin & ChrB( "&H " & varlow) & ChrB( "&H " & varhigh)
Else
strBin = strBin & ChrB(AscB(varchar))
End If
Next
StringToBinary = strBin
End Function
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