I have an excel file in my Response Output stream. I can Open the stream as a file after a prompt, but it doesn't seem I can save it directly to a specified folder on my client. Is this not possible?
That is correct, you cannot specify where the file is going to be downloaded by the browser. That is controlled by the user.
Related
I have a little bit complicate situation here:
I need to download files from a SFTP daily. I connect to the SFTP with username and SSH key, the keys have a passphrase.
This SFTP has no actual files. All the files on the server is 0 bytes. The server will dynamicly generate the file if it get a "get" command.
So when I connect the SFTP with Winscp, everything went perfectly.
But I have to do it in Synapse.
I managed to connect it in Pipeline with copy activity, and I managed to download all the files, but with no data content inside.
Does anyone know how I can download the files with content?
If you actually have files with content in SFTP location, then they should also be automatically copied using the pipeline in your Synapse. In case if you just want to copy the files that are having the content and ignore empty files, then you will have to use a get metadata activity to check the size of the file (i.e., > 0 bytes) and then filter those files only to copy to your desired destination. Using the childItems you can get the fileName, Type and Size and use these properties in the subsequent copy activity to only copy filter files to your destination.
Response.AddHeader("content-disposition", "attachment;filename=abc.xls");
Response.ContentType = "application/excel";
I am using the code above to download an Excel file but I want to download the Excel file to a specific path.
How can I do this?
It is impossible. Server can't to locate client machine for particular destanation of downloading.
RFC 2183:
The receiving MUA SHOULD NOT respect any directory path information
that may seem to be present in the filename parameter. The filename
should be treated as a terminal component only. Portable
specification of directory paths might possibly be done in the future
via a separate Content-Disposition parameter, but no provision is made
for it in this draft.
It can't be done by server side it's your os and browser settins which tells where the downloaded file should be placed as Alexgender says
"The filename should be treated as terminal component only"
I have developed File Upload web page in ASP.NET. Now user can rename a .exe file to txt or some other extension and upload the same. I want to restrict that. How I can implement that in ASP.NET?
The only safe way to do this is to get the byte [] from the file that has been posted and examine it to determine if the file is indeed in one of the formats you allow the user to upload. You don't need to save the file, you can just get the byte[] from the HttpPostedFile object.
Other than examining the content (looking for magic numbers, for example) there isn't an infallible way to make sure that the user is not attempting to upload something that you don't allow.
I have an ASP.NET 2 application and would like users to upload a file to be processed immediately. The file never needs to be used again, so I don't care to store it on the server as a file somewhere, which hopefully will make it more secure on our end.
Basically, they upload an excel file and I process it and display some results. I do not care to save that excel file for later.
How can I do this?
You can hold the file contents in a MemoryStream.
This will ensure it is not saved to disk.
See What is the best practice for storing a file upload to a MemoryStream (C#)? for details.
I have a WebPage where I am giving the option to to Export the Form data to PDF. I am creating the PDF at run time and store the PDF in a "PDF" folder which is under my application directory. After creating the PDF with the SessionID name I Call following function to show the PDF file in the new browser window:
ResponseHelper.Redirect(Response, "~/PDF/" + Session.SessionID + ".pdf", "_Blank", "");
This PDF contains the private information related to the logged in user. Therefore, I want a way to delete this PDF file once it is shown in the browser to the user. This is because the IIS server allows whole development team to view this folder which is a security risk, and we can't disallow user to view this folder on the server.
Therefore, if I could delete this file as soon as it is loaded in the browser could be a solution of this security risk.
Can anyone suggest some better ways of deleting this file as soon as possbile from the application?
Thanks,
Praveen
what i guess is you are creating PDF file on runtime using Itext and then you save that PDF file in temp directory to show it to user... why don't you use
Response.WriteFile(PDFFILE);
this will write the whole file on the stream without saving it in temp folder.
One way is to write an ashx handler which streams the pdf to the browser, then deletes it when done.
Another, and much better way, is to simply build the PDF in memory (NOT using session) and stream it as soon as it's ready.
UPDATE
I'm doing this with a slightly modified version of iTextSharp. Basically, iTextSharp performed all of it's operations in memory, then saved the file to disk. I changed this to return the memory stream. All the code is already there, it was really just a line or two that had to change.
Then, I used a response.binarywrite to push the stream directly to the browser. viola! no files on disk.
An ashx handler is just like an aspx page, only it has one entry point and doesn't do all of the page processing garbage. It's light weight and communicates back to the browser by response.write calls.