Download and run file in client machine using asp.net - asp.net

I'm trying to download and run a file to the client machine. The client is aware of that.
It's a ttkgp file that's dynamicly generated.
I've tried using Processs.Start() that worked fine on my local machine (first saved the file to C:\ then lunched it), but it's not working from the server. It's not my server but a hosted one. They are trying to help but no luck so far.
I've seen this code:
public void ProcessRequest(HttpContext context)
{
string fileName = context.Request.QueryString["filename"];
FileInfo fi = new FileInfo(fileName);
context.Response.ContentType = "application/x-rar-compressed";
context.Response.AppendHeader("Content-Disposition",
string.Format("attachment; filename=download{0}", fi.Name));
context.Response.WriteFile(fileName);
context.Response.End();
}
But since I dont know what's "HttpContext context" is, I've no idea if it works.
Is it some server previlges need to be changed? or simply this code will do the trick?
Thank you
UPDATE (24.6.12): I'm nearly finished with the problem, all I need now is to know how to open an html page in a new tab / window and close it second later. Once I'm done, I'll post back here all the process, I'm sure it'll help other people.
UPDATE (26.6.12):
Here's what I've got:
The goal is to download an TTKGP file from asp.net webiste to local user machine and run it.
Step 1: generate the file with code behaind (c#) on the server (V)
Step 2: copy the file or it's content to user machine (X)
Step 3: run the file using JS (V)
Here's the thing: I CAN copy from a text file on the server to a text file on the user machine, but not from TTKGP files. It's strange because this are just text files just a different extantion.
The code for copying text files:
enter code here
function copyremotetxt() // works
{
// copy the txt file
var fso = new ActiveXObject("Scripting.FileSystemObject");
var newfile = fso.CopyFile("remote.txt", "C:\\Users\\***\\local.txt");
}
Perhaps I can change the file type on the user machine?
Notice 1: I know that's a security issue, the site is just for known user not the open public
Notice 2: I know there are better ways to get the task done, but there are strict limitaions on many things
Thanks for those how can help!!

This code will do the trick. It will prompt the client to download and save the file on his computer at the location he decides. What happens next with this file is the client's decision, not yours. He might simply close the Save As dialog, interrupt the download, delete the file, ... It's up to him.
Another remark: this code is extremely dangerous because it allows the client to pass any filename he wants as query string parameter and download it. So he could read absolutely all files on the server which is probably not something that you want to happen.

Ok, this need a different aproach.
I'll try using JavaScript do read the file on the server, rewrite it in the user machine and activate it. Any clues would be grate! For a start, how to I read file in JS? I'm new to it.

Related

Get file path & filename with asp:FileUpload, don't want file... just path and name

I am developing a .NET intranet site which will enable the user to see a list of files (file details stored in DB) and link to the actual PDF/XML/XLS and open it... kind of like a table of contents for the network.
During data entry, the user enters various data about a document, then browses to the file on the network and selects it using the asp:FileUpload. The codebehind then saves the network path to the DB. There is alot of overhead here because i'm sending the file to the server but never use it.
Everything has been working fine until someone tries to use a large PDF file then I get the dreaded MAXIMUM REQUEST LENGTH EXCEEDED error... So I'm trying to find a solution here... I do not need the actual file.. just the path and filename.
I know not all browsers send the full path but our systems have older browsers so everything is working fine now, but will probably break soon.. which is another reason to find a different solution.
I've looked into Javascript to pull the path but that won't work...
Any other ideas? Other ways to just grab the path and filename? (besides manually typing it in to a Text field)
Thanks,
Todd.
This may help too
How to get the full path of a file from asp: file upload?
string filename = Path.GetFileName(FileUpload1.FileName);//file name
string path= Server.MapPath(filename);//path

Download a file on the client macine using asp.net

I want to download a text file from my website to the users pc without prompting him for the location to save the file.
I have tried it using code below :
Response.TransmitFile("G:\Medical Reporting\Medical\Users\Vishal\Uploaded\Key.txt")
Response.End()
But every time I am just redirected to the new page and all the contents of the file is written there. I don't want to display the contents of the file, but I want to download the file.
Not possible - it's a security issue, otherwise the world would be trying to save all sorts of files on a users machine.
If it's an intranet each user could have a shared drive on a network accessible to the web app and simply copy the file using IO.File.Copy method.
Update
To Prompt a user to download a file you can use the following code which will be fired after clicking something like a button:
this example is for an image, though you can just change the ContentType filename to suit your needs.
Response.ContentType = "image/jpeg";
// this is the important bit that gives the user the prompt to save
Response.AppendHeader("Content-Disposition","attachment; filename=yourfile.jpg");
Response.TransmitFile(Server.MapPath("~/yourfile.jpg"));
Response.End();

how to create a word file on clients from aspx site

my code generates a word document from some data and opens it directly.
when i start it local it works. but when i put the code in the server and try to generate it there it doesnt work.
the file should generate in the clients not on the server. is this possible?
this is how i create the word file:
Dim oApp As Word.Application
Dim oDoc As Word.Document
oApp = CreateObject("Word.Application")
oDoc = oApp.Documents.Add
afte i create the file i can open it with this command:
oApp.Visible = True
Your code is running under IIS on the server. When you run the code locally, it appears to work because your machine is the server and so, when Word opens, you see the window appear. Your code is still running on the "server," though!
You can't open a document directly on a client like this, and nor will the MSWord interop classes you've used affect a client machine. What you could do instead is create the document on the server, and then offer it as a download to your client. Their browser would then offer to the user the typical example of "Open/Save/Cancel" and handle the file as per any other download.
If you can guarantee the presence of a plugin on the client's browser, such that the document can be made to appear in-browser, this would also be an option - the mechanism for serving the file up would be broadly the same, though.

ASP.NET Generating .pdf files, UnauthorizedAccessException on Save()

I have a list of jobs and i give users the option to get job description in form of a pdf file. I use MigraDoc/PDFsharp to generate pdf files.
The problem is, after i render the pdf document and want to save it somewhere on the DevServer i get UnauthorizedAccessException on creating FileStream in PDFsharp PdfDocument.Save() method.
I never really used Windows for anything more advanced than playing games and i'm not sure why would i get this exception since i'm logged in as Administrator user and i guess that my ASP.NET application is running with Administrator privilleges and should be able to write files pretty much anywhere on filesystem.
The Code.
GridViewRow jobRow = (GridViewRow)(sender as Control).Parent.Parent;
Document jobDocument = new Document();
Section xyz = jobDocument.AddSection();
xyz.AddParagraph("Wonderfull job");
PdfDocumentRenderer pdfRenderer = new PdfDocumentRenderer(true);
pdfRenderer.Document = jobDocument;
pdfRenderer.RenderDocument();
string filename = "Job_" + jobRow["3"] + ".pdf"; // Job_[title].pdf
pdfRenderer.PdfDocument.Save(filename);
Last line is the line that causes the exception.
Any suggestions? I'm not an ASP.NET developer and I'm forced to use ASP.NET for my school project so this may be a very simple problem but i really don't know what to do and what to search. Thanks for answering!
Administrator account =! IIS user.
The IIS User needs to have writing privileges, too!
On most machines it is know as "IIS_User" or maybe "network service". First you can grant writing permissions to every User. If this works for you, you know what to do.
First try to set an absolute path as filename, maybe a directory outside of "C:\inetpub\wwwroot"?
Hope this helps!

Deleting Application Temp File from ASP.Net

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.

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