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Downloading attachment from Sharepoint List: object reference not set to instance of an Object error

• Friday, July 03, 2009 2:32 PMRachanaD

   
  

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  Hello,

  I am using the following code for downloading attachment from Sharepoint 2007 List.
  public static string downloadDoc(string listName, string ListItemID)
          {
              string filepath = "";
              try
              {
                  AEPEx_MOSS.Lists ls = new AEPEx_MOSS.Lists();
                  //ls.Credentials = System.Net.CredentialCache.DefaultCredentials;
                  string MOSSWSUser = Microsoft.SSO.Utility.SSOConfigHelper.Read("AEPEx_CarrierInterface", "MOSSWSUserID");
                  string MOSSWSPWD = Microsoft.SSO.Utility.SSOConfigHelper.Read("AEPEx_CarrierInterface", "MOSSWSUserPWD");
                  string MOSSWSDomain = Microsoft.SSO.Utility.SSOConfigHelper.Read("AEPEx_CarrierInterface", "MOSSWSUserDomain");

                  ls.PreAuthenticate = false;
                  System.Net.NetworkCredential cred = default(System.Net.NetworkCredential);
                  cred = new System.Net.NetworkCredential(MOSSWSUser, MOSSWSPWD, MOSSWSDomain);
                  ls.Credentials = cred;
                  SPSecurity.RunWithElevatedPrivileges(delegate()
                  {
                      XmlNode ra = default(XmlNode);
                      ra = ls.GetAttachmentCollection(listName, ListItemID);
                      string url = ra.InnerText;
                      SPSite site = new SPSite(Microsoft.SSO.Utility.SSOConfigHelper.Read("AEPEx_CarrierInterface", "LIST_URL"));
                      SPWeb web = site.OpenWeb();
                      SPFile list = web.GetFile(url);
                      string fn = list.Name;
                      string guid = null;
                      guid = System.Guid.NewGuid().ToString();
                      if (!Directory.Exists(Microsoft.SSO.Utility.SSOConfigHelper.Read("AEPEx_CarrierInterface", "MOSSAttachmentPath") + guid))
                      {
                          Directory.CreateDirectory(Microsoft.SSO.Utility.SSOConfigHelper.Read("AEPEx_CarrierInterface", "MOSSAttachmentPath") + guid);
                          byte[] b = list.OpenBinary();
                          FileStream s = System.IO.File.Create(Microsoft.SSO.Utility.SSOConfigHelper.Read("AEPEx_CarrierInterface", "MOSSAttachmentPath") + guid + "\\" + list.Name);
                          filepath = Microsoft.SSO.Utility.SSOConfigHelper.Read("AEPEx_CarrierInterface", "MOSSAttachmentPath") + guid + "\\" + list.Name;
                          s.Write(b, 0, b.Length);
                          s.Dispose();
                          s.Close();
                      }
                  }
                  );
              }
              catch (Exception ex)
              {
                  AEPEx.Integration.BizTalk.CommonUtilities.Logger.WriteError_Filenet("Exception getting Attachment " + ex.Message, EventLogEntryType.Error);

              }
              return filepath;
          }

  I am getting an error:"Object reference not set to Instance of an object" error.
  When I run this code from a WIndows app, the ATtachment is getting downloaded properly. However when i run this code by adding reference to a Biztalk APp, I am getting the error,at the line when the new SP Site is getting created. I have searched all over the internet without any solution.

  • Edited byMike Walsh MVPMVP, ModeratorFriday, July 03, 2009 2:52 PM"i need help desperately, because it is urgent and " removed from Text. These are forums. If you are in a hurry call MS Customer Support Services. If you use forums be prepared to wait and don't push us.
  • Edited byRachanaD Friday, July 03, 2009 2:37 PM
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