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Re: decoding base64 data on client/browser?

From: Brandon@-----------.---------.---
To: NULL
Date: 3/3/2006 6:37:00 AM
Joe,

First, THANK YOU for replying.  Yes, my xml includes the dt:dt="bin.base64".

Here is one of my XML response files:
<?xml version="1.0"?>
<get_documents_response xmlns:dt="urn:schemas-microsoft-com:datatypes">
 <document>
  <id>239</id>
  <success>1</success>
  <filename>file1infolder1.txt</filename>
  <filedata 
dt:dt="bin.base64">aSdtIGEgZmlsZQ0KDQppJ20gYW4gZWRpdGVkIGZpbGUu</filedata>
 </document>
</get_documents_response>

Is it not possible to do this decoding on the client side maybe (I REALLY 
hope that isn't the problem)?  Your routines, Joe... I saw them (or ones very 
similar) when I was researching this problem, and they were one of my guides 
for getting at least to where I am.

Thanks again, Joe and all.

Brandon


"Joe Fawcett" wrote:

> "Brandon" <Brandon@d...> wrote in message 
> news:4FF749E8-874D-43AA-8143-456AFB5804D5@m......
> > My browser app sends a request to the server for a binary file.  The 
> > server
> > receives the request, converts the file to base64, packages it up in XML, 
> > and
> > returns it to the client/browser.
> >
> > I can parse the returned XML just fine -- and find the base64 data -- but
> > for the life of me cannot get it decoded back to it's original format. 
> > The
> > script below gets the filedata (using "nodeTypedValue") and saves it, but
> > it's still the base64 representation of the file.
> >
> > I've tried a million different things, and have searched all over the web
> > and newsgroups, and I just can't seem to find a combination that gets me 
> > the
> > original unencoded/decoded filedata.
> >
> > Two other notes:
> > 1. On the server side, I set the dataType = "bin.base64"
> > 2. When it's back here on the client, if I alert() out the dataType for 
> > the
> > node, it's null.  I thought that was interesting.
> >
> > Here is my client/browser JavaScript:
> > var getdocs_xmlhttp = new ActiveXObject("Msxml2.XMLHTTP.4.0");
> > var getdocs_xmldoc  = new ActiveXObject("Msxml2.DOMDocument.4.0");
> > getdocs_xmldoc.loadXML(reqxml);
> > getdocs_xmlhttp.open("POST", "http://myserver/getbinfile.asp", false);
> > getdocs_xmlhttp.send(getdocs_xmldoc);
> >
> >  getdocs_xmldoc.loadXML(getdocs_xmlhttp.responseText);
> >  //getdocs_xmldoc.save(folderpath + "download.xml");
> >  var root           = getdocs_xmldoc.documentElement;
> >  var inodelist      = root.childNodes;
> >
> > ...
> > parsing through for other data as well (i.e. filename)
> > ...
> >   if( nitem.nodeName == "filedata" )
> >   {
> >     var objStream = new ActiveXObject("ADODB.Stream")
> >     objStream.Type = 1;
> >     objStream.Open();
> >     objStream.Write( nitem.childNodes.item(0).nodeTypedValue );
> >     objStream.SaveToFile( folderpath + tfilename, (1 & 2) );
> >     objStream.Close();
> >   }
> >
> > ANY help would be MUCH appreciated.  Thank you all!
> >
> > -b
> >
> >
> Not sure how you're creating the node which holds the binary data but it 
> should have dt:dt="bin.base64" as an attribute.
> 
> Here are two scripts, the first saves a Word doc within a base64 node, the 
> second recovers it:
> 
> //BinaryToXml.js
> var WORD_PATH = "C:\\Scripts\\JS\\BinaryXml\\hello1.doc";
> var XML_PATH = "C:\\Scripts\\JS\\BinaryXml\\word.xml"
> 
> function main()
> {
>   var oDoc = new ActiveXObject("MSXML2.DOMDocument.4.0");
>   oDoc.async = false;
>   var oStream = new ActiveXObject("ADODB.Stream");
>   oStream.type = 1; //Binary
>   oStream.open();
>   oStream.loadFromFile(WORD_PATH);
>   var oNode = oDoc.createProcessingInstruction("xml", "version='1.0' 
> encoding='utf-8'")
>   oDoc.insertBefore(oNode, oDoc.childNodes[0]);
>   var oRoot = oDoc.createElement("Root")
>   oDoc.documentElement = oRoot;
>   //Following line is not strictly necessary
>   oRoot.setAttribute("xmlns:dt", "urn:schemas-microsoft-com:datatypes");
>   oNode = oRoot.appendChild(oDoc.createElement("wordDoc"));
>   oNode.dataType = "bin.base64";
>   oNode.nodeTypedValue = oStream.read();
>   oStream.close();
>   oDoc.save(XML_PATH);
>   WScript.echo(oDoc.url);
> }
> 
> main();
> 
> 
> ************************
> 
> //XmlToBinary.js
> var WORD_PATH = "hello2.doc";
> var XML_PATH = "word.xml"
> 
> function main()
> {
>   var oDoc = new ActiveXObject("MSXML2.DOMDocument.4.0");
>   oDoc.async = false;
>   oDoc.load(XML_PATH);
>   var oStream = new ActiveXObject("ADODB.Stream");
>   oStream.type = 1; //Binary
>   oStream.open();
>   oStream.write(oDoc.documentElement.selectSingleNode("wordDoc").nodeTypedValue);
>   oStream.savetoFile(WORD_PATH);
>   oStream.close();
> }
> 
> main();
> 
> 
> 
> -- 
> 
> Joe Fawcett -  XML MVP
> 
> https://mvp.support.microsoft.com/profile=8AA9D5F5-E1C2-44C7-BCE8-8741D22D17A5 
> 
> 
> 


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