Public Function Base64Encode(strSource As String) As String On Error Resume Next '适用于中、英文的Base64编码/解码VB6超精简版 作者:同济黄正 If UBound(arrBase64) = -1 Then arrBase64 = Split(StrConv(cstBase64, vbUnicode), vbNullChar) End If Dim arrB() As Byte, bTmp(2) As Byte, bT As Byte Dim I As Long, J As Long arrB = StrConv(strSource, vbFromUnicode)
ONT>
J = UBound(arrB) For I = 0 To J Step 3 Erase bTmp bTmp(0) = arrB(I + 0) bTmp(1) = arrB(I + 1) bTmp(2) = arrB(I + 2)
bT = (bTmp(1) And 15) * 4 bT = bT + bTmp(2) \ 64 If I + 1 <= J Then Base64Encode = Base64Encode & arrBase64(bT) Else Base64Encode = Base64Encode & "=" End If
bT = bTmp(2) And 63 If I + 2 <= J Then Base64Encode = Base64Encode & arrBase64(bT) Else Base64Encode = Base64Encode & "=" End If Next End Function
Public Function Base64Decode(strEncoded As String) As String '适用于中、英文的Base64编码/解码VB6超精简版 作者:同济黄正 On Error Resume Next Dim arrB() As Byte, bTmp(3) As Byte, bT, bRet() As Byte Dim I As Long, J As Long arrB = StrConv(strEncoded, vbFromUnicode) J = InStr(strEncoded & "=", "=") - 2 ReDim bRet(J - J \ 4 - 1) For I = 0 To J Step 4 Erase bTmp bTmp(0) = (InStr(cstBase64, Chr(arrB(I))) - 1) And 63 bTmp(1) = (InStr(cstBase64, Chr(arrB(I + 1))) - 1) And 63 bTmp(2) = (InStr(cstBase64, Chr(arrB(I + 2))) - 1) And 63 bTmp(3) = (InStr(cstBase64, Chr(arrB(I + 3))) - 1) And 63
