If I open an audio link using cefsharp browser, for example:
mp3
It will play it in the browser.
I am wondering how to make cefsharp download it if the link is an audio.
One solution is to check the link and use System.Net.WebClient to save the link to a file, but if the link isn't end with mp3,wav,...etc
I still need to download it to check the file type.
Here is my solution based on amaitlan's suggestion:
public class CustomResourceRequestHandler : CefSharp.Handler.ResourceRequestHandler
{
protected override CefReturnValue OnBeforeResourceLoad(IWebBrowser chromiumWebBrowser, IBrowser browser, IFrame frame, IRequest request, IRequestCallback callback)
{
if (request.ResourceType == ResourceType.MainFrame && Uri.TryCreate(request.Url, uriKind: UriKind.Absolute, out Uri result))
{
//url is ended with mp3
if (request.Url.EndsWith("mp3"))
{
//save the mp3
using (WebClient myWebClient = new WebClient())
{
myWebClient.DownloadFile(request.Url, "test.mp3");
}
return CefReturnValue.Cancel;
}
}
return CefReturnValue.Continue;
}
}
public class CustomRequestHandler : CefSharp.Handler.RequestHandler
{
protected override IResourceRequestHandler GetResourceRequestHandler(IWebBrowser chromiumWebBrowser, IBrowser browser, IFrame frame, IRequest request, bool isNavigation, bool isDownload, string requestInitiator, ref bool disableDefaultHandling)
{
return new CustomResourceRequestHandler();
}
}
//request handler
browser.RequestHandler = new CustomRequestHandler();
Related
I have web form project, example my link is www.qweqwe.com/setup.exe
if i can write url "www.qweqwe.com/setup.exe" file is downloading automatically.
I don't want this, I need session for download this. I musn't change file name, when session["scr"] is "Ok" than i must let.
(I will use ClickOnce but i don't want can be download from everypeople)
Thanks in advance to everyone
//First check for Session Variable
if(Session["scr"]!=null)
{
//Now if you want file only downloaded by only some specific person then
if(Session["scr"].ToString()=="You Specific Session value")
{
//Here Your File download code
}
}
Build a Generic Handler for downloading files (ASHX).
In the ProcessRequest method you can check the session and serve the file. Here is an example:
public class Download : IHttpHandler
{
public void ProcessRequest(HttpContext context)
{
string file = "setup.exe";
if (File.Exists(context.Server.MapPath(file)) && Session["scr"].ToString() == "Ok")
{
context.Response.Clear();
context.Response.ContentType = "application/octet-stream";
context.Response.AddHeader("content-disposition", "attachment;filename=" + Path.GetFileName(file));
context.Response.WriteFile(context.Server.MapPath(file));
context.Response.End();
}
else
{
context.Response.ContentType = "text/plain";
context.Response.Write("File cannot be found!");
}
}
public bool IsReusable
{
get
{
return false;
}
}
}
Don't forget to remove the MIME for the exe file in your IIS so nobody can download it, directly.
I have an asp.net webforms application and to retrieve video from database that saved in varbinary format and show it as html5 video tag.
after a googled it, i found a way that i should play it asynchronously using ASP.Net WebApi, it works fine
First problem
When video played first time and the user click on play button to replay the video, The remote host closed the connection. The error code is 0x800704CD exception throws at line await outputStream.WriteAsync(buffer, 0, bytesRead);.
Second Problem
When user click on seek bar, the video goes to played from first.
NOTE
Internet Explorer 11 plays the video without any problem, but firefox and chrome have both problems.
how can i solve this problem?
Here is my codes:
public static class WebApiConfig
{
public static void Register(HttpConfiguration config)
{
config.EnableCors();
config.MapHttpAttributeRoutes();
config.Routes.MapHttpRoute(
name: "VideoApi",
routeTemplate: "api/{controller}/{id}",
defaults: new { id = RouteParameter.Optional }
);
}
}
public class VideoController : ApiController
{
public IVideoRepository videoRepository;
public HttpResponseMessage Get(long id)
{
try
{
videoRepository = new VideoRepository();
Video video = videoRepository.load(id);
if (video != null)
{
var videoStream = new VideoStream(video.fileContent);
string ext = video.extension;
var response = Request.CreateResponse();
response.Content = new PushStreamContent((Action<Stream, HttpContent, TransportContext>)videoStream.WriteToStream, new MediaTypeHeaderValue("video/" + ext));
response.Content.Headers.Add("Content-Disposition", "attachment;filename=" + video.fullName.Replace(" ", ""));
response.Content.Headers.Add("Content-Length", videoStream.FileLength.ToString());
return response;
}
else
{
return Request.CreateResponse(HttpStatusCode.NotFound);
}
}
catch (Exception e)
{
return Request.CreateErrorResponse(HttpStatusCode.ServiceUnavailable, e);
}
}
}
public class VideoStream
{
private readonly byte[] _fileContent;
private long _contentLength;
public long FileLength
{
get { return _contentLength; }
}
public VideoStream(byte[] content)
{
_contentLength = content.Length;
_fileContent = content;
}
public async void WriteToStream(Stream outputStream, HttpContent content, TransportContext context)
{
try
{
var buffer = new byte[65536];
MemoryStream memoryStream = new MemoryStream();
memoryStream.Write(_fileContent, 0, _fileContent.Length);
memoryStream.Position = 0;
using (memoryStream)
{
var length = (int)memoryStream.Length;
var bytesRead = 1;
while (length > 0 && bytesRead > 0)
{
bytesRead = memoryStream.Read(buffer, 0, Math.Min(length, buffer.Length));
await outputStream.WriteAsync(buffer, 0, bytesRead);
length -= bytesRead;
}
}
}
catch (Exception e)
{
throw e;
}
finally
{
outputStream.Close();
}
}
}
UPDATE
after this way didn't worked properly, i had to use this way, but the new way have seekbar problem, when user click on seek bar to seek to time it dosn't work in Chrome and FireFox.
ASP.NET is not very good at video streaming. Third-party video streaming solution is the best option.
There are a few video-streaming servers (like Wowza), but they require installation and you have to buy license.
Cloud streaming service is another option. I personally prefer AWS Cloudfront. They propose distribution in various globally distributed content delivery zones. It costs really cheap and you can be sure that it will survive any traffic amount (even if all your users will watch the same video simultaneously).
You might have got the answer by now. But this might help others-
My best bet is removing the Content-length from the response headers.
Content-Length tells the caller that it needs to receive this fixed length in the response.
When you click on a play button, the complete video stream is not received (i.e., the entire Content-Length is not received.) & therefore, the error.
Another approach could be using response.Headers.TransferEncodingChunked = true, which tells the caller that it will receive a response in chunks. The only catch here is you will get a 200OK even if the stream is not present.
In a web api method I am generating a file and then streaming it to the response like so
public async Task<HttpResponseMessage> GetFile() {
FileInfo file = generateFile();
var msg = Request.CreateResponse(HttpStatusCode.OK);
msg.Content = new StreamContent(file.OpenRead());
msg.Content.Headers.ContentType = new MediaTypeHeaderValue("application/pdf");
msg.Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment") {FileName = file.Name};
return msg;
}
because this a generated file I want to delete it after the response has finished streaming but I can't seem to find a hook in the pipeline for this.
I suppose that I can put a reference to the file in a static and set up a custom MessageHandler that pulls values out of this same static variable and deletes. However, this seems like it can't possibly be right both because of the use of a static (when this should all be per-request) and because I'd have to register a separate route.
I've seen this question but it seems to not really have much of a useful response.
Nice scenario!...the problem with using message handlers is that response writing happens at the host layers and below message handlers layer, so they are not ideal...
Following is an example of how you could do it:
msg.Content = new CustomStreamContent(generatedFilePath);
public class CustomStreamContent : StreamContent
{
string filePath;
public CustomStreamContent(string filePath)
: this(File.OpenRead(filePath))
{
this.filePath = filePath;
}
private CustomStreamContent(Stream fileStream)
: base(content: fileStream)
{
}
protected override void Dispose(bool disposing)
{
//close the file stream
base.Dispose(disposing);
try
{
File.Delete(this.filePath);
}
catch (Exception ex)
{
//log this exception somewhere so that you know something bad happened
}
}
}
By the way, are you generating this file because you are converting some data into PDF. If yes, then I think you could use PushStreamContent for this purpose by directly writing the converted data into the response stream. This way you need not generate a file first and then worry about deleting it later.
We performed same action in WebAPI. I needed to delete file just after it downloaded form server.
We can create custom response message class. It takes file path as parameter and delete it once its transmitted.
public class FileResponseMessage : HttpResponseMessage
{
private readonly string _filePath;
public FileHttpResponseMessage(string filePath)
{
this._filePath= filePath;
}
protected override void Dispose(bool disposing)
{
base.Dispose(disposing);
Content.Dispose();
File.Delete(_filePath);
}
}
Use this class as below code and it will delete your file once it will be written on response stream.
var response = new FileResponseMessage(filePath);
response.StatusCode = HttpStatusCode.OK;
response.Content = new StreamContent(new FileStream(filePath, FileMode.Open, FileAccess.Read));
response.Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment")
{
FileName = "MyReport.pdf"
};
return response;
I am trying to write an HTTP handler in C# that loads images from a network drive and writes them to the HTTP response. This is currently not working for me as I keep getting HTTP 302 responses which results in the broken file image being displayed. Below is my HTTP handler. Access permissions have been set so anonymous users have read access to the share but ideally this will not be permanent.
public class SecCamImage : IHttpHandler, IRequiresSessionState
{
public void ProcessRequest(HttpContext context)
{
Configuration config = WebConfigurationManager.OpenWebConfiguration("~/Web.Config");
KeyValueConfigurationElement setting = null;
if(config.AppSettings.Settings.Count > 0)
{
setting = config.AppSettings.Settings["CameraBaseURL"];
}
if(setting != null)
{
string baseURL = setting.Value;
string location = context.Request["location"].ToString();
string camera = context.Request["camera"].ToString();
string image = context.Request["image"].ToString();
if (!(string.Compare(image, "no-image.jpg", true) == 0))
{
if (!string.IsNullOrEmpty(location) && !string.IsNullOrEmpty(camera) && !string.IsNullOrEmpty(image))
{
string fullPath = string.Format(baseURL, location, camera, image);
System.IO.FileInfo imageFile = new System.IO.FileInfo(fullPath);
if (imageFile.Exists)
{
if (context.User.Identity.IsAuthenticated)
{
context.Response.ContentType = "image/jpeg";
context.Response.WriteFile(imageFile.FullName);
context.Response.End();
}
}
}
}
else
{
context.Response.ContentType = "image/jpeg";
context.Response.WriteFile(image);
context.Response.End();
}
}
}
public bool IsReusable
{
get { return false; }
}
}
The URL stored in the config file is structured like this:-
\\\\host\\directory\\{0}\\{1}\\{2}
{0} and {1} are directories and {2} is the file.
I managed to get this working by adding a Virtual Directory to our Website on IIS. The .ashx handler now references the Virutal Directory and not the directory on the network drive.
What is the best way to return XML from a controller's action in ASP.NET MVC? There is a nice way to return JSON, but not for XML. Do I really need to route the XML through a View, or should I do the not-best-practice way of Response.Write-ing it?
return this.Content(xmlString, "text/xml");
Use MVCContrib's XmlResult Action.
For reference here is their code:
public class XmlResult : ActionResult
{
private object objectToSerialize;
/// <summary>
/// Initializes a new instance of the <see cref="XmlResult"/> class.
/// </summary>
/// <param name="objectToSerialize">The object to serialize to XML.</param>
public XmlResult(object objectToSerialize)
{
this.objectToSerialize = objectToSerialize;
}
/// <summary>
/// Gets the object to be serialized to XML.
/// </summary>
public object ObjectToSerialize
{
get { return this.objectToSerialize; }
}
/// <summary>
/// Serialises the object that was passed into the constructor to XML and writes the corresponding XML to the result stream.
/// </summary>
/// <param name="context">The controller context for the current request.</param>
public override void ExecuteResult(ControllerContext context)
{
if (this.objectToSerialize != null)
{
context.HttpContext.Response.Clear();
var xs = new System.Xml.Serialization.XmlSerializer(this.objectToSerialize.GetType());
context.HttpContext.Response.ContentType = "text/xml";
xs.Serialize(context.HttpContext.Response.Output, this.objectToSerialize);
}
}
}
If you're building the XML using the excellent Linq-to-XML framework, then this approach will be helpful.
I create an XDocument in the action method.
public ActionResult MyXmlAction()
{
// Create your own XDocument according to your requirements
var xml = new XDocument(
new XElement("root",
new XAttribute("version", "2.0"),
new XElement("child", "Hello World!")));
return new XmlActionResult(xml);
}
This reusable, custom ActionResult serialises the XML for you.
public sealed class XmlActionResult : ActionResult
{
private readonly XDocument _document;
public Formatting Formatting { get; set; }
public string MimeType { get; set; }
public XmlActionResult(XDocument document)
{
if (document == null)
throw new ArgumentNullException("document");
_document = document;
// Default values
MimeType = "text/xml";
Formatting = Formatting.None;
}
public override void ExecuteResult(ControllerContext context)
{
context.HttpContext.Response.Clear();
context.HttpContext.Response.ContentType = MimeType;
using (var writer = new XmlTextWriter(context.HttpContext.Response.OutputStream, Encoding.UTF8) { Formatting = Formatting })
_document.WriteTo(writer);
}
}
You can specify a MIME type (such as application/rss+xml) and whether the output should be indented if you need to. Both properties have sensible defaults.
If you need an encoding other than UTF8, then it's simple to add a property for that too.
If you are only interested to return xml through a request, and you have your xml "chunk", you can just do (as an action in your controller):
public string Xml()
{
Response.ContentType = "text/xml";
return yourXmlChunk;
}
There is a XmlResult (and much more) in MVC Contrib. Take a look at http://www.codeplex.com/MVCContrib
I've had to do this recently for a Sitecore project which uses a method to create an XmlDocument from a Sitecore Item and its children and returns it from the controller ActionResult as a File. My solution:
public virtual ActionResult ReturnXml()
{
return File(Encoding.UTF8.GetBytes(GenerateXmlFeed().OuterXml), "text/xml");
}
use one of these methods
public ContentResult GetXml()
{
string xmlString = "your xml data";
return Content(xmlString, "text/xml");
}
or
public string GetXml()
{
string xmlString = "your xml data";
Response.ContentType = "text/xml";
return xmlString;
}
Finally manage to get this work and thought I would document how here in the hopes of saving others the pain.
Environment
VS2012
SQL Server 2008R2
.NET 4.5
ASP.NET MVC4 (Razor)
Windows 7
Supported Web Browsers
FireFox 23
IE 10
Chrome 29
Opera 16
Safari 5.1.7 (last one for Windows?)
My task was on a ui button click, call a method on my Controller (with some params) and then have it return an MS-Excel XML via an xslt transform. The returned MS-Excel XML would then cause the browser to popup the Open/Save dialog. This had to work in all the browsers (listed above).
At first I tried with Ajax and to create a dynamic Anchor with the "download" attribute for the filename,
but that only worked for about 3 of the 5 browsers(FF, Chrome, Opera) and not for IE or Safari.
And there were issues with trying to programmatically fire the Click event of the anchor to cause the actual "download".
What I ended up doing was using an "invisible" IFRAME and it worked for all 5 browsers!
So here is what I came up with:
[please note that I am by no means an html/javascript guru and have only included the relevant code]
HTML (snippet of relevant bits)
<div id="docxOutput">
<iframe id="ifOffice" name="ifOffice" width="0" height="0"
hidden="hidden" seamless='seamless' frameBorder="0" scrolling="no"></iframe></div>
JAVASCRIPT
//url to call in the controller to get MS-Excel xml
var _lnkToControllerExcel = '#Url.Action("ExportToExcel", "Home")';
$("#btExportToExcel").on("click", function (event) {
event.preventDefault();
$("#ProgressDialog").show();//like an ajax loader gif
//grab the basket as xml
var keys = GetMyKeys();//returns delimited list of keys (for selected items from UI)
//potential problem - the querystring might be too long??
//2K in IE8
//4096 characters in ASP.Net
//parameter key names must match signature of Controller method
var qsParams = [
'keys=' + keys,
'locale=' + '#locale'
].join('&');
//The element with id="ifOffice"
var officeFrame = $("#ifOffice")[0];
//construct the url for the iframe
var srcUrl = _lnkToControllerExcel + '?' + qsParams;
try {
if (officeFrame != null) {
//Controller method can take up to 4 seconds to return
officeFrame.setAttribute("src", srcUrl);
}
else {
alert('ExportToExcel - failed to get reference to the office iframe!');
}
} catch (ex) {
var errMsg = "ExportToExcel Button Click Handler Error: ";
HandleException(ex, errMsg);
}
finally {
//Need a small 3 second ( delay for the generated MS-Excel XML to come down from server)
setTimeout(function () {
//after the timeout then hide the loader graphic
$("#ProgressDialog").hide();
}, 3000);
//clean up
officeFrame = null;
srcUrl = null;
qsParams = null;
keys = null;
}
});
C# SERVER-SIDE (code snippet)
#Drew created a custom ActionResult called XmlActionResult which I modified for my purpose.
Return XML from a controller's action in as an ActionResult?
My Controller method (returns ActionResult)
passes the keys parameter to a SQL Server stored proc that generates an XML
that XML is then transformed via xslt into an MS-Excel xml (XmlDocument)
creates instance of the modified XmlActionResult and returns it
XmlActionResult result = new XmlActionResult(excelXML, "application/vnd.ms-excel");
string version = DateTime.Now.ToString("dd_MMM_yyyy_hhmmsstt");
string fileMask = "LabelExport_{0}.xml";
result.DownloadFilename = string.Format(fileMask, version);
return result;
The main modification to the XmlActionResult class that #Drew created.
public override void ExecuteResult(ControllerContext context)
{
string lastModDate = DateTime.Now.ToString("R");
//Content-Disposition: attachment; filename="<file name.xml>"
// must set the Content-Disposition so that the web browser will pop the open/save dialog
string disposition = "attachment; " +
"filename=\"" + this.DownloadFilename + "\"; ";
context.HttpContext.Response.Clear();
context.HttpContext.Response.ClearContent();
context.HttpContext.Response.ClearHeaders();
context.HttpContext.Response.Cookies.Clear();
context.HttpContext.Response.Cache.SetCacheability(System.Web.HttpCacheability.NoCache);// Stop Caching in IE
context.HttpContext.Response.Cache.SetNoStore();// Stop Caching in Firefox
context.HttpContext.Response.Cache.SetMaxAge(TimeSpan.Zero);
context.HttpContext.Response.CacheControl = "private";
context.HttpContext.Response.Cache.SetLastModified(DateTime.Now.ToUniversalTime());
context.HttpContext.Response.ContentType = this.MimeType;
context.HttpContext.Response.Charset = System.Text.UTF8Encoding.UTF8.WebName;
//context.HttpContext.Response.Headers.Add("name", "value");
context.HttpContext.Response.Headers.Add("Last-Modified", lastModDate);
context.HttpContext.Response.Headers.Add("Pragma", "no-cache"); // HTTP 1.0.
context.HttpContext.Response.Headers.Add("Expires", "0"); // Proxies.
context.HttpContext.Response.AppendHeader("Content-Disposition", disposition);
using (var writer = new XmlTextWriter(context.HttpContext.Response.OutputStream, this.Encoding)
{ Formatting = this.Formatting })
this.Document.WriteTo(writer);
}
That was basically it.
Hope it helps others.
A simple option that will let you use streams and all that is return File(stream, "text/xml");.
Here is a simple way of doing it:
var xml = new XDocument(
new XElement("root",
new XAttribute("version", "2.0"),
new XElement("child", "Hello World!")));
MemoryStream ms = new MemoryStream();
xml.Save(ms);
return File(new MemoryStream(ms.ToArray()), "text/xml", "HelloWorld.xml");
A small variation of the answer from Drew Noakes that use the method Save() of XDocument.
public sealed class XmlActionResult : ActionResult
{
private readonly XDocument _document;
public string MimeType { get; set; }
public XmlActionResult(XDocument document)
{
if (document == null)
throw new ArgumentNullException("document");
_document = document;
// Default values
MimeType = "text/xml";
}
public override void ExecuteResult(ControllerContext context)
{
context.HttpContext.Response.Clear();
context.HttpContext.Response.ContentType = MimeType;
_document.Save(context.HttpContext.Response.OutputStream)
}
}