using System;
using System.Collections.Generic;
using System.Text;
using System.Net;
namespace Srushti.Updates
{
///
/// Performs online file transfer operations.
///
internal static class NetUtils
{
///
/// Tries to connect a website. Returns result depending
/// on the HTTP respose code.
///
/// True if machine is connected to internet
public static bool IsConnectedToInternet()
{
return CheckOnlineFileExist("http://www.google.com/");
}
///
/// Query for a file available online for download
///
/// file location on remote update server
/// True if file available for download
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;
}
///
/// Download file available on web.
///
/// Only domina information,
/// Ex:http://www.srushtisoft.com/updates/"
/// Target folder on user machine
/// where the downloading file to be stored.
/// The filename to download from web.
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
}
}