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Categories / C# / Network

 

Performs online file transfer operations

using System; using System.Collections.Generic; using System.Text; using System.Net; namespace Srushti.Updates {     /// <summary>     /// Performs online file transfer operations.     /// </summary>     internal static class NetUtils     {         /// <summary>         /// Tries to connect a website. Returns result depending          /// on the HTTP respose code.         /// </summary>         /// <returns>True if machine is connected to internet</returns>         public static bool IsConnectedToInternet()         {             return CheckOnlineFileExist("http://www.google.com/");         }         /// <summary>         /// Query for a file available online for download         /// </summary>         /// <param name="completeURL">file location on remote update server</param>         /// <returns>True if file available for download</returns>         public static bool CheckOnlineFileExist(string completeURL)         {             HttpWebRequest req;             HttpWebResponse resp;             bool returnStatus = false;             try             {                 req = (HttpWebRequest)WebRequest.Create(completeURL);                 req.Timeout = 20000;                 resp = (HttpWebResponse)req.GetResponse();                 if (resp.StatusCode.ToString().Equals("OK"))                     returnStatus = true;   //"Present";                 else                     returnStatus = false;   //"Unable to connect to internet.";                                  resp.Close();                 req = null;             }             catch             {                 returnStatus = false;             }                          return returnStatus;         }         /// <summary>         /// Download file available on web.         /// </summary>         /// <param name="downloadFromURI">Only domina information,          /// Ex:http://www.srushtisoft.com/updates/" </param>         /// <param name="copyToFolder">Target folder on user machine          /// where the downloading file to be stored.</param>         /// <param name="fileName">The filename to download from web.</param>         public static void DownloadFile(string downloadFromURI, string copyToFolder, string fileName)         {             try             {                 Uri uri = new Uri(downloadFromURI +  fileName);                                  //"Downloading updates please wait...";                 System.Net.WebClient webClient = new System.Net.WebClient();                 webClient.DownloadProgressChanged += new DownloadProgressChangedEventHandler(webClient_DownloadProgressChanged);                 webClient.DownloadFileCompleted += new System.ComponentModel.AsyncCompletedEventHandler(webClient_DownloadFileCompleted);                 webClient.DownloadFileAsync(uri, copyToFolder + "\\" + fileName, fileName);                 webClient.Dispose();             }             catch (Exception ex)             {                 throw ex;             }         }         #region Download progress events         public delegate void AppUpdateDownloadPrograessChange(DownloadProgressChangedEventArgs e);         public static event AppUpdateDownloadPrograessChange UpdateDownloadProgressChangeEvent;         public delegate void AppUpdateDownloadCompleted(System.ComponentModel.AsyncCompletedEventArgs e);         public static event AppUpdateDownloadCompleted UpdateDownloadCompletedEvent;         private static void RaiseDownloadCompletedEvent(System.ComponentModel.AsyncCompletedEventArgs e)         {             if (UpdateDownloadCompletedEvent != null)                 UpdateDownloadCompletedEvent(e);         }         static void webClient_DownloadFileCompleted(object sender, System.ComponentModel.AsyncCompletedEventArgs e)         {             RaiseDownloadCompletedEvent(e);          }         private static void RaiseDownloadProgress(DownloadProgressChangedEventArgs e)         {             if (UpdateDownloadProgressChangeEvent != null)                 UpdateDownloadProgressChangeEvent(e);         }         static void webClient_DownloadProgressChanged(object sender, DownloadProgressChangedEventArgs e)         {             RaiseDownloadProgress(e);         }         #endregion     } }