Exporting version to base64encoded binary

Hi!

Is there an existing function to get binary data of a file(document with pdf mimetype, last version in a content server) to encode it to base64 and pass somewhere else?

I've found $WebDoc.WebDocUtils.NodeToWeb and NodeToView. These functions stream bytes straight to socket or file, but I would like to encode it to base64 and than pass somewhere.

I've also found $LLIAPI.NodeUtil.StreamNodeToText. But it seems that is does not return pdf file, at least I can not convert result to pdf.

How can I archive it?

Thanks in advance

xECM 10.5

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Kyle_Swidrovich

Hi Ruslan,

Check out the XMLExport code (?func=ll&objaction=xmlexport&objID=#).

That’s exactly what it does when the content is included in the export, when using the base64 parameter value.

Kyle

sıɹɥɔ

The OScript Str package includes a base64 encoder. It is documented in the SDK, for 16.0 here:

https://knowledge.opentext.com/knowledge/llisapi.dll/fetch/-15106263/15106294/15106295/16376487/62426572/62359672/documentation/str.html#cm_str_tobase64

Chris Meyer

$XML.XMLNodeUtil.WriteDapiContent(<temp object>, dapiversion)

This will write a list into <temp object>.fContent, which you can join into a string using Str.Join(). E.g.,

String base64 = Str.Join(<temp object>.fContent)

You'll probably want to wrap that into a cleaner API, but that's the gist of it.

The OScript Str package includes a base64 encoder.

Does that work with binary files?

sıɹɥɔ

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">

Oops, thanks Chris. I should have been pointing to theBytes package instead of Str:

https://knowledge.opentext.com/knowledge/llisapi.dll/fetch/-15106263/15106294/15106295/16376487/62426572/62359672/documentation/bytes.html#cm_bytes_tobase64

(And, as usual, your solution is amazing! :-)

From: eLink Entry: Content Server Development Forum [mailto:development@elinkkc.opentext.com]
Sent: Monday, April 03, 2017 9:18 AM
To: eLink Recipient
Subject: Exporting version to base64encoded binary 2

Exporting version to base64encoded binary 2

Posted by Meyer, Chris On 04/03/2017 12:13 PM

Hi Ruslan: Check out $XML.XMLNodeUtil.WriteDapiContent(). It's not a simple API where you can pass in a version and get out a base64 string: What you need to do is create a temporary object (either viaOS.NewTemp() or Frame.New()) have an fContent feature on it, and call it as follows:$XML.XMLNodeUtil.WriteDapiContent(<temp object>, dapiversion)This will write a list into <temp object>.fContent, which you can join into a string usingStr.Join(). E.g.,String base64 = Str.Join(<temp object>.fContent)You'll probably want to wrap that into a cleaner API, but that's the gist of it.The OScript Str package includes a base64 encoder.Does that work with binary files?

Chris Meyer

I made a mistake in my previous post. $XML.XMLNodeUtil.WriteDapiContent only expects a Write() function, which is called multiple times to write the base64 string (e.g., which can be written to fContent).

Either way, here's a standalone function that uses an Assoc and an anonymous function to achieve the same result:

function String DAPIVersionToBase64(DAPIVersion version)    Assoc a    a.fContent = {}    a.Write = Compiler.Compile("function Void Write(String txt);.fContent = {@.fContent, txt};end")    $XML.XMLNodeUtil.WriteDapiContent(a, version)    return Str.Join(a.fContent)end

I should have been pointing to the Bytes package instead of Str:

The $XML.XMLNodeUtil.WriteDapiContent script also uses Bytes.ToBase64, but handles the stuff around it.

(And, as usual, your solution is amazing! :-)

Thanks, if only it worked.

Ruslan Voronoj

Thank you, Chris!

That is exactly what I wanted. Took me some time to realize that I have to implement write() function to get results before you added last post.

Although, I had problems with extracting bytes into object property, because apparently you can not create object's .property with Bytes datatype. Or I dont know how to do that.

So what I did was pushing pieces of bytes into this object's list property, and then putting it back together and converting into base 64:
version = DAPI.GetVersion( node, node.pVersionNum )
flen = version.pFileDataSize

.byteslist = {}
Assoc retva = $XML.XMLNodeUtil.WriteDapiContent(this, version, false)

//write() method fills .byteslist with chunks of bytes
           if !isError(retva) && isDefined(retva) && isFeature(retva,"ok") && retva.ok
               bts = .byteslist
               tmpBytes = Bytes.Allocate( flen + 1 )
               for i=1 to length(bts)
                   Bytes.PutBytes( tmpBytes, x, bts[i], Bytes.InPlace )
                   x += length(bts[i])
               end
               retv = Bytes.ToBase64(tmpBytes)
           end

return retv

Write() function:

   Public function boolean Write(Dynamic data)

       Boolean       retval    = TRUE
       Integer       dataType = Type( data )

       if ( dataType == BytesType )

           .byteslist = list.setAdd(.byteslist, data)
       end

end

It looks like WriteDapiContent can export chunks of base64 data already and I've tried it, but it adds str.EOL() symbols after each line by some reason and I couldn't manage to parse the result into valid pdf file. Therefore that mess with bytes.

I don't know it that is efficient, but it works like a charm! Thanks, everyone!