Base64和StrToByte

 1 Function Base64Encode(inData As String) As String
 2     Const Base64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
 3     Dim cOut As String, sOut As String, i As Long
 4     Dim Bytes() As Byte
 5     Dim t As String
 6     Dim iLen As Long
 7     Dim sGroup As String
 8     t = StrConv(inData & "..", vbFromUnicode)
 9     Bytes = t
10     iLen = UBound(Bytes) - 2
11     Bytes(iLen + 1) = 0
12     Bytes(iLen + 2) = 0
13     sOut = ""
14     For i = 0 To iLen Step 3
15         sGroup = Oct(&H10000 * CLng(Bytes(i)) + &H100 * CLng(Bytes(i + 1)) + Bytes(i + 2))
16         sGroup = String(8 - Len(sGroup), "0") & sGroup
17         sOut = sOut + Mid(Base64, CLng("&o" & Mid(sGroup, 1, 2)) + 1, 1) + Mid(Base64, CLng("&o" & Mid(sGroup, 3, 2)) + 1, 1) + Mid(Base64, CLng("&o" & Mid(sGroup, 5, 2)) + 1, 1) + Mid(Base64, CLng("&o" & Mid(sGroup, 7, 2)) + 1, 1)
18     Next
19     Select Case iLen Mod 3
20         Case 0:
21             sOut = Left(sOut, Len(sOut) - 2) + "=="
22         Case 1:
23             sOut = Left(sOut, Len(sOut) - 1) + "="
24     End Select
25     Base64Encode = sOut
26 End Function
27 
28 
29 
30  'StrToByte  
31  Function StrToByte(s As String)
32 Dim Bytes() As Byte
33 Dim t
34 t = StrConv(s, vbFromUnicode)
35 Bytes = t
36 StrToByte = Bytes
37 End Function 
38 
39