/// <summary>
/// Instructs the AutoUpdateDownloader to query for the latest version available
/// </summary>
/// <param name="progressViewer">The progress viewer by which progress should be displayed</param>
/// <param name="options">The options that affect this downloader</param>
/// <param name="productToUpdate">The product descriptor for the product that should be updated</param>
/// <param name="updateAvailable">The download descriptor that describes the download that could potentially occur</param>
/// <returns></returns>
public override bool QueryLatestVersion(IProgressViewer progressViewer, AutoUpdateOptions options, AutoUpdateProductDescriptor productToUpdate, out AutoUpdateDownloadDescriptor updateAvailable)
{
updateAvailable = null;
try
{
// create a manual web service proxy based on the url specified in the options
Debug.WriteLine(string.Format("Creating a web service proxy to the following url.\n\tThe web service url is '{0}'.", options.WebServiceUrl), MY_TRACE_CATEGORY);
AutoUpdateWebServiceProxy service = new AutoUpdateWebServiceProxy(options.WebServiceUrl);
// use the web service to query for updates
Debug.WriteLine(string.Format("Querying the web service for the latest version of '{0}'.\n\tThe current product's version is '{1}'.\n\tThe current product's id is '{2}'.\n\tThe web service url is '{3}'.", productToUpdate.Name, productToUpdate.Version.ToString(), productToUpdate.Id, options.WebServiceUrl), MY_TRACE_CATEGORY);
XmlNode node = service.QueryLatestVersionEx(productToUpdate.Name, productToUpdate.Version.ToString(), productToUpdate.Id);
// if the service returned no results, then there is no update availabe
if (node == null)
{
// bail out
Debug.WriteLine(string.Format("No updates are available from the web service at '{0}' for this product.", options.WebServiceUrl), MY_TRACE_CATEGORY);
return false;
}
// otherwise create a reader and try and read the xml from the xml node returned from the web service
XmlAutoUpdateManifestReader reader = new XmlAutoUpdateManifestReader(node);
// using the reader we can recreate the manifeset from the xml
AutoUpdateManifest manifest = reader.Read();
/*
* now create a download descriptor that says, yes we have found an update.
* we are capable of downloading it, according to these options.
* the autoupdate manager will decide which downloader to use to download the update
* */
updateAvailable = new AutoUpdateDownloadDescriptor(manifest, this, options);
// just to let everyone know that there is a version available
Debug.WriteLine(string.Format("Version '{0}' of '{1}' is available for download.\n\tThe download url is '{2}'.\n\tThe size of the download is {3}.", updateAvailable.Manifest.Product.Version.ToString(), updateAvailable.Manifest.Product.Name, updateAvailable.Manifest.UrlOfUpdate, this.FormatFileLengthForDisplay(updateAvailable.Manifest.SizeOfUpdate)), MY_TRACE_CATEGORY);
// we've successfully queried for the latest version of the product to update
return true;
}
catch(ThreadAbortException)
{
}
catch(Exception ex)
{
throw new Exception(ex.Message, ex);
}
return false;
}
/// <summary>
/// Writes the Test specified to the file specified using the specified encoding
/// </summary>
/// <param name="test">The test to write</param>
/// <param name="path">The file to write to</param>
/// <param name="encoding">The encoding to write with</param>
public static AutoUpdateManifest Read(string path)
{
AutoUpdateManifest manifest = null;
// create a new test writer
using (FileStream stream = File.Open(path, FileMode.Open, FileAccess.Read, FileShare.Read))
{
// create a reader to read the manifest
XmlAutoUpdateManifestReader reader = new XmlAutoUpdateManifestReader(stream);
// read the manifest
manifest = reader.Read();
stream.Close();
}
return(manifest);
}
/// <summary>
/// Writes the Test specified to the file specified using the specified encoding
/// </summary>
/// <param name="test">The test to write</param>
/// <param name="path">The file to write to</param>
/// <param name="encoding">The encoding to write with</param>
public static AutoUpdateManifest Read(string path)
{
AutoUpdateManifest manifest = null;
// create a new test writer
using (FileStream stream = File.Open(path, FileMode.Open, FileAccess.Read, FileShare.Read))
{
// create a reader to read the manifest
XmlAutoUpdateManifestReader reader = new XmlAutoUpdateManifestReader(stream);
// read the manifest
manifest = reader.Read();
stream.Close();
}
return manifest;
}
