/// <summary>
/// Checks for updates online.
/// </summary>
private static void checkForUpdates()
{
// Version info and salt
uint salt = (uint)Salt.GetSalt();
Version ver = Assembly.GetExecutingAssembly().GetName().Version;
OperatingSystem osi = Environment.OSVersion;
string osVerStr = osi.Version.Major + "." + osi.Version.Minor + "." + osi.Version.Build + "." + osi.Version.Revision;
// Create web request; make sure we go through user's configured proxy, if any.
WebRequest req = HttpWebRequest.Create(Magic.UpdateCheckUrl);
req.Proxy = WebRequest.GetSystemWebProxy();
req.Proxy.Credentials = CredentialCache.DefaultCredentials;
// POST data
string pdata = Magic.UpdatePostPattern;
pdata = string.Format(pdata, Magic.UpdateProduct, salt, ver.Major, ver.Minor, osVerStr);
byte[] data = Encoding.ASCII.GetBytes(pdata);
// Send POST data
req.Method = "POST";
req.ContentType = "application/x-www-form-urlencoded";
req.ContentLength = data.Length;
using (var stream = req.GetRequestStream())
{
stream.Write(data, 0, data.Length);
}
// Read response, which is an XML.
// Try-finally to make sure response is closed.
XmlDocument xmldoc = null;
WebResponse resp = req.GetResponse();
try
{
Stream respStream = resp.GetResponseStream();
using (MemoryStream memStream = new MemoryStream())
{
byte[] buffer = new byte[4096];
int count = 0;
int n = 0;
do
{
n = respStream.Read(buffer, 0, buffer.Length);
count += n;
if (n == 0)
{
break;
}
memStream.Write(buffer, 0, n);
} while (n > 0);
respStream.Close();
memStream.Seek(0, SeekOrigin.Begin);
using (TextReader tr = new StreamReader(memStream))
{
xmldoc = new XmlDocument();
xmldoc.LoadXml(tr.ReadToEnd());
}
}
}
finally
{
resp.Close();
}
// Try and store update info.
// If this throws, then we got trash; store that there's no update.
try
{
storeUpdateInfo(xmldoc);
}
catch
{
UpdateInfo.ClearUpdate();
}
}