I have a page where I'm simply trying to write a pdf to the screen. Here's what I'm doing:
protected void ViewPDF(string url)
{
Response.Clear();
Response.ClearContent();
Response.ClearHeaders();
Response.ContentType = "application/pdf";
Response.TransmitFile(url);
Response.Flush();
Response.End();
}
This works in every browser and OS except for Firefox on Mac. Instead of displaying the pdf file in the browser, the browser opens the dialog to download the file, where you can Open it or Save it.
I've also tried this:
protected void ViewPDF(string url)
{
Response.Clear();
Response.ContentType = "application/pdf";
string path = Server.MapPath(url);
byte[] data = File.ReadAllBytes(path);
Response.BinaryWrite(data);
Response.End();
}
And I get the same result.
Anyone know how to fix this?
The browser needs to be able to render any given file format. Firefox (for Mac) does not include a PDF renderer out of the box. It's that simple.
See http://support.mozilla.org/en-US/kb/view-pdf-files-firefox-without-downloading-them.
You can try changing the content disposition header. There is a full discussion in this post:
Content-Disposition:What are the differences between “inline” and “attachment”?
Related
I've got basic functionality to stream a file to the browser which invokes a "Save As". The output is dynamically generated and stored within a string and not a file saved on the server.
See code below.
string output = GenerateCSVDdata;
Response.Clear();
Response.ClearHeaders();
Response.AddHeader("Content-Disposition", "attachment; filename=\"test.csv\");
Response.ContentType = "application/octet-stream";
Response.BinaryWrite(System.Text.Encoding.UTF8.GetPreamble());
Response.Write(output);
Response.End();
Now, on my development server, the CSV fully downloads. On the production server, the last few characters on end are cut off. The larger the CSV, the more characters are missing. I've tried so many different things like Response.Flush etc but nothing can fix it. The only thing I can do is throw a load of empty chars on the end in hope nothing gets cut.
Is there something quite wrong with this method of streaming a file download without actually saving the file to disk?
Thanks for your help.
Can you determine if there is a difference in the byte count for the .csv file you are using?
byte[] defaultEncodingBytes = System.Text.Encoding.Default.GetBytes(defaultEncodingFileContents);
byte[] UTF8EncodingBytes = System.Text.Encoding.UTF8.GetBytes(defaultEncodingFileContents);
Try this, it worked for me.
void DownloadFile(string filename)
{
//string filename = "c:\\temp\\test.csv";
byte[] contents = System.IO.File.ReadAllBytes(filename);
Response.Clear();
Response.ClearHeaders();
Response.AppendHeader("Content-disposition", String.Format("attachment; filename=\"{0}\"", System.IO.Path.GetFileName(filename)));
Response.AppendHeader("Content-Type", "binary/octet-stream");
Response.AppendHeader("Content-length", contents.Length.ToString());
Response.BinaryWrite(contents);
if (Response.IsClientConnected)
Response.Flush();
}
Regards.
It shouldn't be this hard to find out how to do this. Basically I'm trying to take a string and let the client save it when they click a button. It should pop up with a Save/Open dialog. No extra bells and whistles or anything. It's not rocket science, (or so I would've thought).
There seems to be a ton of different ways, (StreamWriter, HttpResponse, etc.), but none of the examples I've been able to find work properly or explain what's going on. Thanks in advance.
An example one of the many blocks of code I've found...
(This is just an example, feel free to not base your answer around this.)
String FileName = "FileName.txt";
String FilePath = "C:/...."; //Replace this
System.Web.HttpResponse response = System.Web.HttpContext.Current.Response;
response.ClearContent();
response.Clear();
response.ContentType = "text/plain";
response.AddHeader("Content-Disposition", "attachment; filename=" + FileName + ";");
response.TransmitFile(FilePath);
response.Flush();
response.End();
Line 2 says to replace that string. How? This code was advertised as bringing up a dialog. I shouldn't be having to set a path in the code, right?
EDIT: Final Outcome (Edited again, Delete has to come before End();)
string FilePath = Server.MapPath("~/Temp/");
string FileName = "test.txt";
// Creates the file on server
File.WriteAllText(FilePath + FileName, "hello");
// Prompts user to save file
System.Web.HttpResponse response = System.Web.HttpContext.Current.Response;
response.ClearContent();
response.Clear();
response.ContentType = "text/plain";
response.AddHeader("Content-Disposition", "attachment; filename=" + FileName + ";");
response.TransmitFile(FilePath + FileName);
response.Flush();
// Deletes the file on server
File.Delete(FilePath + FileName);
response.End();
Line 2 (FilePath) indicates the path to the file on the server
Line 8:
response.TransmitFile(FilePath);
Transmits that specific file to the client and THAT is what pops the save dialog.
If you don't transmit the file, I'm not sure if the dialog will pop up at all (even though you set a header)
Anyways, I think line 8 should read:
response.TransmitFile(FilePath + FileName);
There will be a default dialog box by browser, if it will find Response as some file. If you want browser to display that default dialog box, all you need to do is send response to browser as file, which you can do in number of ways:
If it is a static file,
best way is to just mention path of file in anchor tag's href.(obviously if you don't have security concern)
Just out along with your response, the way it is done in your example.
Other ways you can refer here 4 ways to send pdf from asp.net
If it is a dynamic file which you need to generate at run time, you can do a trick, generate the file from filestream, put it in some temporary folder at server, read it back as a static file as mentioned above.
Just use this code it should work to prompt the user to open a dialog for opening or saving the file on the system ....
byte[] bytesPDF = System.IO.File.ReadAllBytes(#"C:\sample.pdf");
if (bytesPDF != null)
{
Response.AddHeader("content-disposition", "attachment;filename= DownloadSample.pdf");
Response.ContentType = "application/octectstream";
Response.BinaryWrite(bytesPDF);
Response.End();
}
FilePath is supposed to point to the file you want to send to the client. This is the path on the server.
I'm exporting a CSV to firefox using the following code:
string csv = dataTable.ToCSV();
Response.ClearContent();
Response.AddHeader("Content-disposition", "attachment;filename=solicitud.csv");
Response.AddHeader("Content-length", (Encoding.Unicode.GetBytes(csv).Length).ToString());
Response.ContentType = "application/excel";
Response.ContentEncoding = Encoding.Unicode;
Response.Write(csv);
Response.End();
However, firefox get stucked in "starting" when downloading the files, my guess is that firefox keeps waiting to receive more bytes, this only happens in firefox, IE works fine, Am I missing a header or do you see anything wrong with the code?
Instead use TransmitFile
Writes the specified file directly to
an HTTP response output stream without
buffering it in memory.
This is my problem.
I load xml from my database and push it to the client using code.
But the problem is that the browser automatically opens that xml instead of offering it as a download.
Is there a way to force your browser to download that file and not showing it?
I'm working in a C#, Asp.net environment (with IIS7).
Thx
protected void DisplayDownloadDialog()
{
Response.Clear();
Response.AddHeader(
"content-disposition", string.Format("attachment; filename={0}", "filename.xml"));
Response.ContentType = "application/octet-stream";
Response.WriteFile("FilePath");
Response.End();
}
This will force to download the file and not display in the browser.
This will work for any file types
without requiring to specify any
special MIME type.
This is explained in this article: http://www.xefteri.com/articles/show.cfm?id=8
The key is in this line:
Response.AddHeader("Content-Disposition", "attachment; filename=" & file.Name)
Add a content-disposition: attachment header.
I am having problem with writing PDF files to browser. Other mime types work fine.
PDF files become corrupted.
FileInfo file = new FileInfo(Path.Combine(_module.FileDir, _file.FilePath));
Response.ClearContent();
Response.ClearHeaders();
Response.ContentType = _file.ContentType;
Response.AppendHeader("Content-Disposition", "attachment; filename=" + Regex.Replace(_file.FilePath, "\\s", "-"));
Response.AppendHeader("Content-Length", file.Length.ToString());
try
{
Response.WriteFile(file.FullName);
Response.Flush();
Response.Close();
}
catch
{
Response.ClearContent();
}
My problem was with HTTP Module. I was applying White space filter
HttpApplication app = sender as HttpApplication;
if (app != null && app.Request.RawUrl.Contains(".aspx"))
{
app.Response.Filter = new WhitespaceFilter(app.Response.Filter);
}
IIS HTTP Compression and Streaming PDF's: Don't work well.
http://blog.1530technologies.com/2006/11/iis_http_compre.html
You need these three statements:
Response.Flush();
Response.Close();
Response.End();
The last one is the most important.
For this situation, a Response.Redirect should work just as well:
FileInfo file = new FileInfo(Path.Combine(_module.FileDir, _file.FilePath));
Response.Redirect(file.FullName);
Are you sure you're getting the right MIME type?
Are you attempting to force the user to download, or just stream out the PDF data?
Are you performing a Response.End() call anywhere to ensure that no extra data (outside of the headers and the PDF binary) is sent?
I'm thinking it's #3 that may be your issue here. Microsoft's Knowledge Base provides this code to do, essentially, what you seem to be doing.
//Set the appropriate ContentType.
Response.ContentType = "Application/pdf";
//Get the physical path to the file.
string FilePath = MapPath("acrobat.pdf");
//Write the file directly to the HTTP content output stream.
Response.WriteFile(FilePath);
Response.End();