The following functions have been implemented in GeneXus X to get and set a Blob file content in Base64:

• ToBase64String() : Returns Blob file content in Base64.
• FromBase64String() : Loads the content in Base64 received by parameter into the Blob file.

&ContentBase64 = <att | var>.ToBase64String() 

<att | var>.FromBase64String(&ContentBase64)

&ContentBase64 contains the Base64 content and could be a LongVarChar, for instance.

So far, when a Web Service with a returning Blob parameter is called, the returned value will be the Blob's file content in Base64.

&ContentBase64 = &WebServiceBlob.Execute()