/// <summary>
/// Downloads the contents at the URL and save them to a temporary file.
/// </summary>
/// <param name="url">The URL that specifies what to download.</param>
/// <returns>The file name it was saved to.</returns>
public string DownloadZipFile(DownloadInfo downloadInfo, BackgroundWorker workerThread)
{
CookieContainer cookieContainer = null;
HttpWebRequest webRequest = null;
HttpWebResponse webResponse = null;
Stream responseStream = null;
FileStream fileStream = null;
string fileName = "";
// we can't get the size of the download because it's not included in the response header
// so we will estimate that it's 500k
long estimatedSize = 500000;
try
{
// create the cookie container
cookieContainer = new CookieContainer();
cookieContainer.Add(new Uri("http://www.codeproject.com/"), downloadInfo.Cookies);
// Create the web request
webRequest = (HttpWebRequest)HttpWebRequest.Create(downloadInfo.ProjectUrl);
// Set default authentication for retrieving the file
webRequest.Credentials = CredentialCache.DefaultCredentials;
// identifies itself
webRequest.UserAgent = "CPBrowser";
// apply the session cookies
webRequest.CookieContainer = cookieContainer;
// Get the response
webResponse = (HttpWebResponse)webRequest.GetResponse();
// Get the response stream
responseStream = webResponse.GetResponseStream();
// get the name from the url
fileName = ExtractNameFromUrl(downloadInfo.ProjectUrl.ToString()) + ".zip";
fileName = Path.Combine(Path.GetTempPath(), fileName);
// write it to a temporary file in 1000 byte chunks
fileStream = new FileStream(fileName, FileMode.Create);
int bytesRead = 0;
int totalBytesRead = 0;
int progress = 15;
byte[] data = new byte[1000];
// keep looping until we read nothing
do
{
// read the next 1000 bytes of data
bytesRead = responseStream.Read(data, 0, 1000);
// write the data to the file
fileStream.Write(data, 0, bytesRead);
// report the progress
totalBytesRead += bytesRead;
// because this is an estimation, if the downloaded amount goes over the
// estimated amount, just loop back to 0
if (totalBytesRead >= estimatedSize)
totalBytesRead = 0;
progress = (int)(((float)totalBytesRead / (float)estimatedSize) * 99.0f);
workerThread.ReportProgress(progress);
}
while (bytesRead > 0);
// report that we're done
workerThread.ReportProgress(100);
}
catch (Exception ex)
{
string errMsg = "Error downloading file: ";
// check if the user is logged in
bool isLoggedIn = IsUserLoggedIn(downloadInfo.Cookies);
if (isLoggedIn == false)
errMsg += "Make sure you are logged in to the web site.";
else
errMsg += ex.Message;
throw new Exception(errMsg);
}
finally
{
// free any resources
if (fileStream != null)
{
fileStream.Close();
fileStream.Dispose();
}
if (responseStream != null)
{
responseStream.Close();
responseStream.Dispose();
}
if (webResponse != null)
webResponse.Close();
}
// return the file name
return fileName;
}
/// <summary>
/// This is the event handler which is called when the web browser control
/// begins navigating to an URL. We want to intercept this navigation when the
/// URL ends in .zip, which indicates that a sample project may be being
/// downloaded. If the URL ends with a .zip extension, ask if the user wants to
/// open the sample directly in Visual Studio. If so, then cancel IE's handling
/// of this message, otherwise do nothing.
/// </summary>
private void WebBrowserCtl_Navigating(object sender, WebBrowserNavigatingEventArgs e)
{
try
{
string originalUrl = e.Url.ToString();
// check the extension of the link
string extension = Path.GetExtension(originalUrl);
if (String.Compare(extension, ".zip", true) == 0)
{
// if our worker thread os busy, just pass
if (m_downloadWorkerThread.IsBusy == true)
{
e.Cancel = true;
return;
}
// ask the user if they want to open the project directly
DialogResult dr = MessageBox.Show("Would you like to open this with the Code Project Browser?", "Code Project Browser", MessageBoxButtons.YesNoCancel, MessageBoxIcon.Question);
if (dr == DialogResult.Yes)
{
try
{
ShowBusy();
// set the status bar
m_dte.StatusBar.Text = "Downloading Code Project file...";
// create the download info
string cookieString = "";
if (WebBrowserCtl.Document != null)
cookieString = WebBrowserCtl.Document.Cookie;
DownloadInfo downloadInfo = new DownloadInfo(e.Url, WebBrowserCtl.Url, WebBrowserCtl.Document);
// download the zip file asynchronously
m_downloadWorkerThread.RunWorkerAsync(downloadInfo);
}
catch (Exception ex)
{
ShowNotBusy();
string errMsg = "Error: " + ex.Message;
MessageBox.Show(errMsg, "Code Project Browser", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
// tell IE not to go any further with this request
e.Cancel = true;
}
else if (dr == DialogResult.Cancel)
{
// tell IE not to go any further with this request
e.Cancel = true;
}
}
else if (IsArticleURL(e.Url) == true)
{
ShowBusy();
// add the url to the combo box
ComboURL.Text = originalUrl;
m_navigating = true;
}
}
catch (Exception ex)
{
ShowNotBusy();
// show the error message
MessageBox.Show("Unable to navigate: " + ex.Message, "Code Project Browser", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
}
}