decodificación de codificación base 64 en ejemplo de código de Excel

Ejemplo: excel vba base64 codificar decodificar cadena

'VBA functions to encode and decode Base64 text. 
'Both support utf-8:

Function EncodeBase64(text$)
    Dim b
    With CreateObject("ADODB.Stream")
        .Open: .Type = 2: .Charset = "utf-8"
        .WriteText text: .Position = 0: .Type = 1: b = .Read
        With CreateObject("Microsoft.XMLDOM").createElement("b64")
            .DataType = "bin.base64": .nodeTypedValue = b
            EncodeBase64 = Replace(Mid(.text, 5), vbLf, "")
        End With
        .Close
    End With
End Function
    

Function DecodeBase64(b64$)
    Dim b
    With CreateObject("Microsoft.XMLDOM").createElement("b64")
        .DataType = "bin.base64": .text = b64
        b = .nodeTypedValue
        With CreateObject("ADODB.Stream")
            .Open: .Type = 1: .Write b: .Position = 0: .Type = 2: .Charset = "utf-8"
            DecodeBase64 = .ReadText
            .Close
        End With
    End With
End Function

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