I have tried to download an FTP file using C# and have had various problems. What I want to achieve is to be able to show download progress in a progressBar. It is important that I use Windows Form and .Net.
I have tried two codes;
My first code works perfectly, that is, I can download the FTP file without problems.
CODE 1
FtpWebRequest dirFtp = ((FtpWebRequest)FtpWebRequest.Create(ficFTP));
dirFtp.KeepAlive = true;
dirFtp.UsePassive = UsePassive;
dirFtp.UseBinary = UseBinary;
// Los datos del usuario (credenciales)
NetworkCredential cr = new NetworkCredential(user, pass);
dirFtp.Credentials = cr;
FtpWebResponse response = (FtpWebResponse)dirFtp.GetResponse();
long size = (long)response.ContentLength;
Stream responseStream = response.GetResponseStream();
StreamReader reader = new StreamReader(responseStream);
using (FileStream writer = new FileStream(dirLocal, FileMode.Create))
{
int bufferSize = 2048;
int readCount;
byte[] buffer = new byte[2048];
readCount = responseStream.Read(buffer, 0, bufferSize);
while (readCount > 0)
{
writer.Write(buffer, 0, readCount);
readCount = responseStream.Read(buffer, 0, bufferSize);
}
}
lblDescarga.Text = "¡Downloaded!";
reader.Close();
response.Close();
Problem with this code
My problem with this code is that I can't get the size of the FTP file to be able to use the progressBar, In theory this section of code would tell me the size of my file but it always returns -1:
long size = (long)response.ContentLength;
As this did not work as I wanted, I made a post and people recommended this solution FtpWebRequest FTP download with ProgressBar:
CODE 2
try
{
const string url = "ftp://185.222.111.11:21/patch/archive.zip";
NetworkCredential credentials = new NetworkCredential("user", "pass");
// Query size of the file to be downloaded
WebRequest sizeRequest = WebRequest.Create(url);
sizeRequest.Credentials = credentials;
sizeRequest.Method = WebRequestMethods.Ftp.GetFileSize;
int size = (int)sizeRequest.GetResponse().ContentLength;
progressBar1.Invoke(
(MethodInvoker)(() => progressBar1.Maximum = size));
// Download the file
WebRequest request = WebRequest.Create(url);
request.Credentials = credentials;
request.Method = WebRequestMethods.Ftp.DownloadFile;
using (Stream ftpStream = request.GetResponse().GetResponseStream())
using (Stream fileStream = File.Create(@"C:\tmp\archive.zip"))
{
byte[] buffer = new byte[10240];
int read;
while ((read = ftpStream.Read(buffer, 0, buffer.Length)) > 0)
{
fileStream.Write(buffer, 0, read);
int position = (int)fileStream.Position;
progressBar1.Invoke(
(MethodInvoker)(() => progressBar1.Value = position));
}
}
}
catch (Exception e)
{
MessageBox.Show(e.Message);
}
Problem with this code
The problem with this code is when it gets to this point:
int size = (int) sizeRequest.GetResponse (). ContentLength;
Remote server error: (550) File not available (eg file not found or not accessed).
The truth is that it is impossible to tell that you do not have permission if code 1 works well. However I have the normal permissions in FTP, could someone give me an idea please?
