1: /// <summary>

   2: /// Checks if a person/group of people are free for a specified time

   3: /// </summary>

   4: /// <param name="People">The people to check on</param>

   5: /// <param name="StartTime">The start time</param>

   6: /// <param name="EndTime">The end time</param>

   7: /// <param name="Interval">The interval in minutes at which to check (the minimum is 10 minutes)</param>

   8: /// <param name="UserName">The username of the person checking</param>

   9: /// <param name="Password">The password of the person checking</param>

  10: /// <param name="TimeZoneDifference">Time zone difference</param>

  11: /// <param name="Server">Server name</param>

  12: /// <returns>returns an array of bytes stating whether someone is free or not, a 1 means they are not free during that time and a 0 means they are free</returns>

  13: public static byte[] GetFreeBusyData(StringDictionary People, DateTime StartTime, DateTime EndTime, int Interval,

  14:     string UserName, string Password, string Server, string TimeZoneDifference)

  15: {

  16:     if (People.Count < 1)

  17:         return null;

  18:     if (StartTime >= EndTime)

  19:         return null;

  20:     string EmailAddresses = "";

  21:     foreach (string Person in People.Values)

  22:     {

  23:         EmailAddresses += "&u=SMTP:" + Person;

  24:     }

  25:     string Url = Server + "/public/?cmd=freebusy&start=" + StartTime.ToString("yyyy'-'MM'-'dd'T'HH':'mm':'ss") + TimeZoneDifference + "&end=" + EndTime.ToString("yyyy'-'MM'-'dd'T'HH':'mm':'ss") + TimeZoneDifference + "&interval=" + Interval.ToString() + EmailAddresses;

  26:  

  27:     System.Net.CredentialCache MyCredentialCache = new System.Net.CredentialCache();

  28:     if (!string.IsNullOrEmpty(UserName) && !string.IsNullOrEmpty(Password))

  29:     {

  30:         MyCredentialCache.Add(new System.Uri(Url),

  31:                             "NTLM",

  32:                             new System.Net.NetworkCredential(UserName, Password, "")

  33:                             );

  34:     }

  35:     else

  36:     {

  37:         MyCredentialCache.Add(new System.Uri(Url),

  38:                                "Negotiate",

  39:                                (System.Net.NetworkCredential)CredentialCache.DefaultCredentials);

  40:     }

  41:  

  42:     System.Net.HttpWebRequest Request = (System.Net.HttpWebRequest)HttpWebRequest.Create(Url);

  43:     Request.Credentials = MyCredentialCache;

  44:     Request.Method = "GET";

  45:     Request.ContentType = "text/xml; encoding='utf-8'";

  46:     Request.UserAgent = "Mozilla/4.0(compatible;MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727; InfoPath.1)";

  47:     Request.KeepAlive = true;

  48:     Request.AllowAutoRedirect = false;

  49:  

  50:     System.Net.WebResponse Response = (HttpWebResponse)Request.GetResponse();

  51:     byte[] bytes = null;

  52:     using (System.IO.Stream ResponseStream = Response.GetResponseStream())

  53:     {

  54:         XmlDocument ResponseXmlDoc = new XmlDocument();

  55:         ResponseXmlDoc.Load(ResponseStream);

  56:         XmlNodeList DisplayNameNodes = ResponseXmlDoc.GetElementsByTagName("a:item");

  57:         if (DisplayNameNodes.Count > 0)

  58:         {

  59:             for (int i = 0; i < DisplayNameNodes.Count; i++)

  60:             {

  61:                 XmlNodeList Nodes = DisplayNameNodes[i].ChildNodes;

  62:                 foreach (XmlNode Node in Nodes)

  63:                 {

  64:                     if (Node.Name == "a:fbdata")

  65:                     {

  66:                         bytes = new byte[Node.InnerText.Length];

  67:                         for (int x = 0; x < Node.InnerText.Length; ++x)

  68:                         {

  69:                             bytes[x] = byte.Parse(Node.InnerText[x].ToString());

  70:                         }

  71:                     }

  72:                 }

  73:             }

  74:         }

  75:         else

  76:         {

  77:             throw new Exception("Could not get free/busy data from the exchange server");

  78:         }

  79:         // Clean up.

  80:         ResponseStream.Close();

  81:         Response.Close();

  82:     }

  83:     return bytes;

  84: }