vb base64支持中文版

概述Option ExplicitPrivate Const cstBase64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"Private arrBase64() As StringPublic Function Base64Encode(strSource As String) As S

Option ExplicitPrivate Const cstBase64 = "ABCDEFGHIJKLMnopQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"Private arrBase64() As StringPublic Function Base64Encode(strSource As String) As String On Error Resume Next 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) 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(0) And 252) / 4 Base64Encode = Base64Encode & arrBase64(bT) bT = (bTmp(0) And 3) * 16 bT = bT + bTmp(1) / 16 Base64Encode = Base64Encode & arrBase64(bT) 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 NextEnd FunctionPublic Function Base64Decode(strEncoded As String) As String On Error Resume Next Dim arrB() As Byte,bTmp(3) As Byte,bT As Long,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 bT = bTmp(0) * 2 ^ 18 + bTmp(1) * 2 ^ 12 + bTmp(2) * 2 ^ 6 + bTmp(3) bRet((I / 4) * 3) = bT / 65536 bRet((I / 4) * 3 + 1) = (bT And 65280) / 256 bRet((I / 4) * 3 + 2) = bT And 255 Next Base64Decode = StrConv(bRet,vbUnicode)End FunctionPrivate Sub Command1_Click() MsgBox Base64Encode("这是中文") MsgBox Base64Decode("1eLKx9bQzsQ=") 'MsgBox Base64Decode("asdfasdfasdfasd") '没有容错处理。。End Sub

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