So I'm trying to build some sort of a media player, the application prepares audio from an external source (HTTP server sitting on another device), when trying to seek the MediaPlayer returns "Stream has no duration and is therefore not seekable"
Note: I saw questions about the same error but they were about live streams, this is a static MP3 file.
Code from the other device (the server of the audio files)
private static void WriteFile(HttpListenerContext ctx, Android.Net.Uri uri, Activity activity)
{
var response = ctx.Response;
Debug.Print(ctx.Request.RemoteEndPoint.ToString());
using (var file = activity.ContentResolver.OpenInputStream(uri))
{
string fileName = "Audio.mp3";
ICursor cursor = activity.ContentResolver.Query(uri, null, null, null, null);
try
{
if (cursor != null && cursor.MoveToFirst())
fileName = cursor.GetString(cursor.GetColumnIndex(OpenableColumns.DisplayName));
}
finally
{
cursor.Close();
}
response.SendChunked = false;
response.ContentType = "audio/mpeg";
response.AddHeader("Content-disposition", "attachment; filename=" + fileName);
byte[] buffer = new byte[64 * 1024];
int read;
using (BinaryWriter bw = new BinaryWriter(response.OutputStream))
{
while ((read = file.Read(buffer, 0, buffer.Length)) > 0)
{
bw.Write(buffer, 0, read);
bw.Flush();
}
bw.Close();
response.ContentLength64 = bw.BaseStream.Length;
}
response.StatusCode = (int)HttpStatusCode.OK;
response.StatusDescription = "OK";
response.OutputStream.Close();
}
I'm not sure how this code is not throwing a "cannot access a closed stream" exception:
bw.Close();
response.ContentLength64 = bw.BaseStream.Length;
But... retrieve the length before closing the stream:
response.ContentLength64 = bw.BaseStream.Length;
bw.Close();
Related
I have 4.7.2 application where on anchor tag we have file link like 'www.abc.com/a.txt'. If I click it file is opening in new tab.
But now expected result is - When user hit that link, I want to intercept this link & change it to 'www.xyz.com/a.txt' & return response in new tab. Basically open file in new tab (no download).
Currently I'm able to download file using below code but I want to open in new tab.
Stream stream = null;
int bytesToRead = 10000;
byte[] buffer = new Byte[bytesToRead];
try
{
string apiGatewayFilePath = "www.xyz.com/a.txt";
HttpWebRequest fileReq = (HttpWebRequest)WebRequest.Create(apiGatewayFilePath);
string fileName = Path.GetFileName(apiGatewayFilePath);
HttpWebResponse fileResp = (HttpWebResponse)fileReq.GetResponse();
if (fileReq.ContentLength > 0)
fileResp.ContentLength = fileReq.ContentLength;
stream = fileResp.GetResponseStream();
var resp = HttpContext.Current.Response;
resp.ContentType = MediaTypeNames.Application.Octet;
resp.AddHeader("Content-Disposition", "inline; filename=\"" + fileName + "\"");
resp.AddHeader("Content-Length", fileResp.ContentLength.ToString());
int length;
do
{
if (resp.IsClientConnected)
{
length = stream.Read(buffer, 0, bytesToRead);
resp.OutputStream.Write(buffer, 0, length);
resp.Flush();
buffer = new Byte[bytesToRead];
}
else
{
length = -1;
}
} while (length > 0);
}
finally
{
if (stream != null)
{
stream.Close();
}
}
I need to download an .PDF file from a website : https://XXXXX/XXXX/XXXXXXX.pdf when user click's on link button. Below code is working fine in local but when I try to click on link button for downloading the file after deploying into server, First time it is working fire but next consecutive downloads, It is displaying as The XXXX.PDF download was interrupted or file cannot be downloaded.
try
{
string fullFileName =string.Empty;
LinkButton btn = (LinkButton)(sender);
string filepath = btn.CommandArgument;
string fileName = btn.Text;
if (fileName != null && !string.IsNullOrEmpty(fileName))
{
fullFileName = filePath +fileName ;
int bytesToRead = 10000;
// Buffer to read bytes in chunk size specified above
byte[] buffer = new Byte[bytesToRead];
//string fileName = System.IO.Path.GetFileName(fullFileName);
//Create a WebRequest to get the file
System.Net.ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3 | System.Net.SecurityProtocolType.Tls | (SecurityProtocolType)768/*TLS1.1*/ | (SecurityProtocolType)3072/*TLS1.2*/;
HttpWebRequest fileReq = (HttpWebRequest)HttpWebRequest.Create(fullFileName);
//Create a response for this request
HttpWebResponse fileResp = (HttpWebResponse)fileReq.GetResponse();
if (fileReq.ContentLength > 0)
fileResp.ContentLength = fileReq.ContentLength;
//Get the Stream returned from the response
stream = fileResp.GetResponseStream();
// prepare the response to the client. resp is the client Response
var resp = HttpContext.Current.Response;
//Indicate the type of data being sent
resp.ContentType = "application/PDF";
//Name the file
resp.AddHeader("Content-Disposition", "attachment; filename=\"" + fileName + "\"");
resp.AddHeader("Content-Length", fileResp.ContentLength.ToString());
int length;
do
{
// Verify that the client is connected.
if (resp.IsClientConnected)
{
// Read data into the buffer.
length = stream.Read(buffer, 0, bytesToRead);
// and write it out to the response's output stream
resp.OutputStream.Write(buffer, 0, length);
// Flush the data
resp.Flush();
//Clear the buffer
buffer = new Byte[bytesToRead];
}
else
{
// cancel the download if client has disconnected
length = -1;
}
} while (length > 0); //Repeat until no data is read
}
else
{
lblFile.Text = "File Name is missing";
lblFile.Visible = true;
}
}
catch (Exception ex)
{
}
finally
{
if (stream != null)
{
//Close the input stream
stream.Close();
}
}
Can someone please guide me why it is failing in server
I am trying to upload an image file via FTP in ASP.Net. The image file is uploaded to correct location but when I read or download it, it's corrupt. My code is given below
protected void FTPUpload()
{
//FTP Server URL.
string ftp = ConfigurationManager.AppSettings.Get("FTPServer");
//FTP Folder name.
string ftpFolder = "images/logos/";
//FTP Credentials
string ftpUsername = ConfigurationManager.AppSettings.Get("FTPUsername");
string ftpPassword = ConfigurationManager.AppSettings.Get("FTPPassword");
byte[] fileBytes = null;
//Read the FileName and convert it to Byte array.
string fileName = Path.GetFileName(fuLogo.FileName);
using (StreamReader fileStream = new StreamReader(fuLogo.PostedFile.InputStream))
{
fileBytes = Encoding.UTF8.GetBytes(fileStream.ReadToEnd());
fileStream.Close();
}
try
{
//Create FTP Request.
FtpWebRequest request = (FtpWebRequest)WebRequest.Create(ftp + ftpFolder + fileName);
request.Method = WebRequestMethods.Ftp.UploadFile;
//Enter FTP Server credentials.
request.Credentials = new NetworkCredential(ftpUsername, ftpPassword);
request.ContentLength = fileBytes.Length;
request.UsePassive = true;
request.UseBinary = true;
request.ServicePoint.ConnectionLimit = fileBytes.Length;
request.EnableSsl = false;
using (var requestStream = request.GetRequestStream())
{
CopyStream(fuLogo.PostedFile.InputStream, requestStream);
}
FtpWebResponse response = (FtpWebResponse)request.GetResponse();
//lblMessage.Text += fileName + " uploaded.<br />";
response.Close();
}
catch (WebException ex)
{
throw new Exception((ex.Response as FtpWebResponse).StatusDescription);
}
}
public static void CopyStream(Stream input, Stream output)
{
byte[] buffer = new byte[1024000];
int read;
while ((read = input.Read(buffer, 0, buffer.Length)) > 0)
{
output.Write(buffer, 0, read);
}
}
Am I missing something? The file is uploaded perfectly but for some reason it gets corrupted.
This part smells:
using (StreamReader fileStream = new StreamReader(fuLogo.PostedFile.InputStream))
{
fileBytes = Encoding.UTF8.GetBytes(fileStream.ReadToEnd());
fileStream.Close();
}
There should be no reason to first copy image to array (and use default text encoding/UTF8 decoding in the meantime) - just do stream-to-stream copy(see How do I copy the contents of one stream to another?):
public static void CopyStream(Stream input, Stream output)
{
byte[] buffer = new byte[32768];
int read;
while ((read = input.Read(buffer, 0, buffer.Length)) > 0)
{
output.Write (buffer, 0, read);
}
}
So the ftp upload should be just
using (var requestStream = request.GetRequestStream())
{
CopyStream(fuLogo.PostedFile.InputStream, requestStream);
// no need to requestStream.Close(); - using does that for you
}
I have a C# windows form application which downloads file from a url(asp.net application) but it is not returning full image lets say image is of 780kb the file that windows form creates is 381 bytes exactly.
I am not able to figure out the issue. Please help.
The code i am using for download is:
public bool getFileFromURL(string url, string filename)
{
long contentLength = 0;
Stream stream = null;
try
{
WebRequest req = WebRequest.Create(url);
WebResponse response = req.GetResponse();
stream = response.GetResponseStream();
contentLength = response.ContentLength;
// Transfer the file
byte[] buffer = new byte[10 * 1024]; // 50KB at a time
int numBytesRead = 0;
long totalBytesRead = 0;
using (FileStream fileStream = new FileStream(filename, FileMode.Create))
{
using (BinaryWriter fileWriter = new BinaryWriter(fileStream))
{
while (stream.CanRead)
{
numBytesRead = stream.Read(buffer, 0, buffer.Length);
if (numBytesRead == 0) break;
totalBytesRead += numBytesRead;
fileWriter.Write(buffer, 0, numBytesRead);
}
fileWriter.Close();
}
fileStream.Close();
}
stream.Close();
response.Close();
req.Abort();
return true;
}
catch (Exception)
{
return false;
}
}
This is my asp.net app code:
using (PortalEntities db = new PortalEntities())
{
PortalModel.Command command = db.Commands.SingleOrDefault(c => c.id == id);
var filePath = Server.MapPath("~/Uploads/"+command.arguments);
if (!File.Exists(filePath))
return;
var fileInfo = new System.IO.FileInfo(filePath);
Response.ContentType = "image/jpg";
Response.AddHeader("Content-Disposition", String.Format("attachment;filename=\"{0}\"", filePath));
Response.AddHeader("Content-Length", fileInfo.Length.ToString());
Response.WriteFile(filePath);
Response.End();
}
That's an awful lot of code to write some bytes out to a file from a web response. How about something like this (.NET 4+):
public static bool GetFileFromURL(string url, string filename)
{
try
{
var req = WebRequest.Create(url);
using (Stream output = File.OpenWrite(filename))
using (WebResponse res = req.GetResponse())
using (Stream s = res.GetResponseStream())
s.CopyTo(output);
return true;
}
catch
{
return false;
}
}
You can download image in more elegant way, it was discussed before here Unable to locate FromStream in Image class
And use File.WriteAllBytes Method to save the byte array as a file, more info at
http://msdn.microsoft.com/en-us/library/system.io.file.writeallbytes(v=vs.110).aspx
So all your client code can be replaced with
public void getFileFromURL(string url, string filename)
{
using (var webClient = new WebClient())
{
File.WriteAllBytes(filename,webClient.DownloadData(url));
}
}
Dude, why are you not using WebClient.DownloadFileAsync?
private void DownloadFile(string url, string path)
{
using (var client = new System.Net.WebClient())
{
client.DownloadFileAsync(new Uri(url), path);
}
}
That's pretty much it, but this method can't download over 2GB. But i don't think the image is that big xD.
Hope it helps!
I'm trying to download an xls file from a url:
http://www.site.com/ff/excel/file.aspx?deven=0
I'm using this code but when the download is complete the file is not properly downloaded. How can I download this file correctly?
string remoteFilename="http://www.site.com/ff/excel/file.aspx?deven=0";
string localFilename = "D:\\1\\1.xls";
Stream remoteStream = null;
Stream localStream = null;
WebResponse response = null;
try
{
// Create a request for the specified remote file name
WebRequest request = WebRequest.Create(remoteFilename);
if (request != null)
{
// Send the request to the server and retrieve the
// WebResponse object
response = request.GetResponse();
response.ContentType = "application/vnd.ms-excel";
if (response != null)
{
// Once the WebResponse object has been retrieved,
// get the stream object associated with the response's data
remoteStream = response.GetResponseStream();
// Create the local file
localStream = File.Create(localFilename);
// Allocate a 1k buffer
byte[] buffer = new byte[1024];
int bytesRead;
// Simple do/while loop to read from stream until
// no bytes are returned
do
{
// Read data (up to 1k) from the stream
bytesRead = remoteStream.Read(buffer, 0, buffer.Length);
// Write the data to the local file
localStream.Write(buffer, 0, bytesRead);
// Increment total bytes processed
} while (bytesRead > 0);
}
}
}
catch (Exception e)
{
MessageBox.Show(e.Message);
}
finally
{
// Close the response and streams objects here
// to make sure they're closed even if an exception
// is thrown at some point
if (response != null) response.Close();
if (remoteStream != null) remoteStream.Close();
if (localStream != null) localStream.Close();
}
MessageBox.Show("file downl");
Use WebClient, it's much simpler:
using (WebClient webClient = new WebClient())
{
webClient.DownloadFile(remoteFileName, localFilename);
}
if(File.Exists(localFilename))
MessageBox.Show("File Downloaded");
Try flushing with localStream.Flush() AFTER your do {} while(), you might also want to wrap with a using statement.
For example:
// Create the local file
using (localStream = File.Create(localFilename)) {
// Allocate a 1k buffer
byte[] buffer = new byte[1024];
int bytesRead;
// Simple do/while loop to read from stream until
// no bytes are returned
do {
// Read data (up to 1k) from the stream
bytesRead = remoteStream.Read(buffer, 0, buffer.Length);
// Write the data to the local file
localStream.Write(buffer, 0, bytesRead);
// Increment total bytes processed
} while (bytesRead > 0);
localStream.Flush();
}
This is how I download Excel files using a FilePathResult.
public FilePathResult DownloadFile(int ID)
{
var log = _db.Logs.FirstOrDefault(x => x.LogID == ID);
//Download the spreadsheet
string fileName = string.Format("{0}.xlsx", ID);
string path = _directory + "\\" + fileName;
return File(path, "application/vnd.ms-excel", string.Format("{0}.xlsx", log.ReportTitle));
}