private void Download(object startPoint)
{
try
{
// Put the object argument into an int variable
int startPointInt = Convert.ToInt32(startPoint);
// Create a request to the file we are downloading
webRequest = (HttpWebRequest)WebRequest.Create((string)txtUrl.Text);
// Set the starting point of the request
webRequest.AddRange(startPointInt);
// Set default authentication for retrieving the file
webRequest.Credentials = CredentialCache.DefaultCredentials;
// Retrieve the response from the server
webResponse = (HttpWebResponse)webRequest.GetResponse();
// Ask the server for the file size and store it
Int64 fileSize = webResponse.ContentLength;
// Open the URL for download
strResponse = webResponse.GetResponseStream();
// calculate the TargetFile
String sTargetFile = txtPath.Text;
if (Directory.Exists(txtPath.Text))
{
String sFileName = Path.GetFileName(txtUrl.Text);
sTargetFile = Path.Combine(sTargetFile, sFileName);
}
if (File.Exists(sTargetFile))
{
try
{
File.Delete(sTargetFile);
}
catch (Exception)
{
string alternativeFileName = DI.config.TempFileNameInTempDirectory + "_" +
Path.GetFileName(sTargetFile);
DI.log.info("In Donwnload could not create file :{0}, so downloding into {1} instead",
sTargetFile, alternativeFileName);
sTargetFile = alternativeFileName;
}
}
// Create a new file stream where we will be saving the data (local drive)
strLocal = startPointInt == 0
? new FileStream(sTargetFile, FileMode.Create, FileAccess.Write, FileShare.None)
: new FileStream(sTargetFile, FileMode.Append, FileAccess.Write, FileShare.None);
// It will store the current number of bytes we retrieved from the server
int bytesSize;
// A buffer for storing and writing the data retrieved from the server
var downBuffer = new byte[2048];
// Loop through the buffer until the buffer is empty
while ((bytesSize = strResponse.Read(downBuffer, 0, downBuffer.Length)) > 0)
{
// Write the data from the buffer to the local hard drive
strLocal.Write(downBuffer, 0, bytesSize);
// Invoke the method that updates the O2Form's label and progress bar
Invoke(new UpdateProgessCallback(UpdateProgress),
new object[] { strLocal.Length, fileSize + startPointInt });
if (goPause)
{
break;
}
}
// invoke completed callback
if (dCallbackWhenCompleted != null)
{
dCallbackWhenCompleted.Invoke(sTargetFile);
}
}
catch (Exception ex)
{
string message = string.Format("in Download: {0} (for request:{1})", ex.Message, txtUrl.Text);
lblProgress.invokeOnThread(() =>
{
lblProgress.Text = message;
lblProgress.ForeColor = Color.Red;
});
DI.log.error(message);
}
finally
{
// When the above code has ended, close the streams
if (strResponse != null)
{
strResponse.Close();
}
if (strLocal != null)
{
strLocal.Close();
}
}
// close O2Form if required
if (cbCloseWindowWhenDownloadComplete.Checked)
{
if (Parent != null && (Parent.GetType().Name == "Form" || Parent.GetType().Name == "GenericDockContent"))
{
O2Forms.executeMethodThreadSafe(Parent, "Close");
}
//().Close();
//this.Parent
}
}