Getting a list of files from a MOSS document library using a SharePoint web service

A useful link that shows how to get list of files form doc lib of MOSS using webservice


Excerpts:

My challenge was simple. I needed to develop an SSIS package that
would download and extract data from

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every Excel file held in document
libraries across several SharePoint sites. SSIS was the natural choice as
the data needed to be cleaned and validated before being imported into a
database. However, SSIS is not great with web services – especially in the data
flow. As I not worked with the SharePoint web services much, I started with a
good old Console application.

MOSS, or more accurately, WSS provides a whole host of web services to obtain information about
SharePoint sites. However, figuring out which method to invoke and what
parameters to pass is more problematic. Especially as many of the
parameters are chunks of Collaborative Application Mark-up Language (CAML) – a
dialect of XML developed by Microsoft specifically for use with SharePoint.

A False Start

My first console app simply obtained the GUID of the document library using the
GetListCollection() method of the Lists web service. The GUID was then
passed to the GetListItems() method which duly provided all documents and folders
at the top level of the document library. It then seemed logical to me to
recursively call the GetListItems() method using the GUID of each sub-folder.
On no, how wrong could I be! The GetListItems() method simply chokes on these
folder GUIDs.

On searching the internet I found many other incorrect forum posts and blog
entries about the same topic – but no working solutions. I also made an
extensive search of my eBook collection – but again no solutions – which
overall motivated me to write this blog entry.

The solution - RTFM

Well, if I had read the whole page in the manual, I would have got to the
solution earlier. The key to my puzzle was
the QueryOptions XML fragment which
has both a Folder element and the all important <ViewAttributes
Scope="Recursive" /> element. Using these elements together, it is
possible to obtain a list of all documents in all subfolders in the list.
Indeed, it does not even bother returning the subfolder details!

So here is the code for my working C# sample.

using System;

using System.Collections.Generic;

using System.Text;

using System.Xml;

using System.Web.Services;

using System.Web;

using System.Net;

namespace ConsoleApplication1

{
class Program
{

static void Main(string[] args)
{

string siteUrl = @"http://yourserver/sites/yoursite";

string documentLibraryName = @"Shared
Documents";

SharePointList.Lists
wsList = new SharePointList.Lists();

wsList.Credentials
= System.Net.CredentialCache.DefaultCredentials;

WebProxy
proxyObj = new WebProxy("yourproxy", 80);

wsList.Proxy
= proxyObj;

wsList.Url
= siteUrl + @"/_vti_bin/lists.asmx";

// get a list of all top level lists

XmlNode
allLists = wsList.GetListCollection();

// load into an XML document so we can use XPath to query
content

XmlDocument
allListsDoc = new XmlDocument();

allListsDoc.LoadXml(allLists.OuterXml);

// allListsDoc.Save(@"c:\allListsDoc.xml"); // for debug

XmlNamespaceManager
ns = new
XmlNamespaceManager(allListsDoc.NameTable);

ns.AddNamespace("d", allLists.NamespaceURI);

// now get the GUID of the document library we are looking
for

XmlNode
dlNode = allListsDoc.SelectSingleNode("/d:Lists/d:List[@Title='"
+ documentLibraryName + "']", ns);

if (dlNode == null)

{

Console.WriteLine("Document
Library '{0}' not found!", documentLibraryName);

}

else

{

// obtain the GUID for the document library and the webID

string documentLibraryGUID = dlNode.Attributes["ID"].Value;

string webId = dlNode.Attributes["WebId"].Value;

Console.WriteLine("Opening
folder '{0}' GUID={1}", documentLibraryName, documentLibraryGUID);

// create ViewFields CAML

XmlDocument
viewFieldsDoc = new XmlDocument();

XmlNode
ViewFields = AddXmlElement(viewFieldsDoc, "ViewFields",
"");

AddFieldRef(ViewFields,
"GUID");

AddFieldRef(ViewFields,
"ContentType");

AddFieldRef(ViewFields,
"BaseName");

AddFieldRef(ViewFields,
"Modified");

AddFieldRef(ViewFields,
"EncodedAbsUrl");

//viewFieldsDoc.Save(@"c:\viewFields.xml"); // for debug

// create QueryOptions CAML

XmlDocument
queryOptionsDoc = new XmlDocument();


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