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8.0

ASP.NET 2.0 - Create PDF on Web server, stream to client, and deletre file

Asked by tigris_7 in Programming for ASP.NET, Microsoft IIS Web Server, Miscellaneous Web Development

Tags: IE, FF, Chrome

I can't believe I am still having trouble with stuff like this, but I am.

I am developing an Asp.Net 2.0 web app (on HTTPS) where the flow is as follows:

Page one gathers some pertinent info for creating the appropriate PDF file, redirects to Page 2

Page 2 retrieves info from session and PDF file is created successfully on server via iTextSharp, a couple more session vars are created, and  then redirects back to Page 1.

Page 1 attempts to stream file to client via the attached code snippet. The result is a blank PDF, whose size matches the size of the file on the server, and the opened file always has a [1] or [2] and so on appended to the name, as if it is a copy of an already existing file.It seems to stream the file to the IE Temp folder first but for some reason the file is blank, but as expected on the server.

A file path example is path = @"C:\sites\pfgboss\files\" + filename;

This code works for me in another page. I have experimented with the Response.AddHeader section to no avail.

All the code works on my non-https Windows XP development machine

Please help...I am stuck. Any suggestions are welcome, even trying another approach.




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/// <summary>
    /// Helper function for 'FindAndStreamPdfFromServer'...
    /// Streams an eStatement Pdf from server to client machine
    /// </summary>
    /// <param name="url"></param>
    private void StreamPdfFromServer(string url, string dl_filename)
    {
        FileStream fs = null;
        byte[] bytBytes = null;
        bool success = false;
        //check if file exist
        if (File.Exists(url))
        {
            try
            {
                //if file exists open file to stream and force download on the client
                fs = File.Open(url, FileMode.Open);
                bytBytes = new byte[fs.Length];
                fs.Read(bytBytes, 0, Int32.Parse(fs.Length.ToString()));
                fs.Close();
                success = true;
            }
            catch (Exception ex)
            {
                ErrorLog.logMsg("Error : " + ex.ToString());
            }
            finally
            {
                if (fs != null)
                    fs.Close();
            }
            try
            {
                if (success && bytBytes != null && url.EndsWith("pdf"))
                {                                       
                    Response.Clear();
                    Response.ClearHeaders();
                    Response.ClearContent();
                    Response.Buffer = true;
                    Response.AddHeader("Content-Length", bytBytes.Length.ToString());
                    Response.AddHeader("Content-disposition", "attachment; filename=" + dl_filename);
                    Response.AddHeader("Expires", "0");
                    Response.AddHeader("Pragma", "cache");
                    Response.AddHeader("Cache-Control", "private");
                    Response.ContentType = "application/pdf";
                    Response.BinaryWrite(bytBytes); 
                }
                else if (success && bytBytes != null && url.EndsWith("txt"))
                {
                    Response.Clear();
                    Response.ClearHeaders();
                    Response.ClearContent();
                    Response.AddHeader("Content-disposition", "attachment; filename=" + dl_filename);
                    Response.ContentType = "application/txt";
                    Response.BinaryWrite(bytBytes);
                }
                else
                {
                    ErrorLog.logMsg("Error : FindFileAndDisplay(string url) - File:" + url + "doesn't exist");
                }
            }
            catch (Exception ex)
            {
                string temp = ex.Message;
            }
            finally
            {
                //if(File.Exists(url))
                //    File.Delete(url);
            }
        }
    }
[+][-]09/16/08 01:05 AM, ID: 22485970Expert Comment

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[+][-]09/16/08 09:58 AM, ID: 22490588Accepted Solution

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About this solution

Zones: Programming for ASP.NET, Microsoft IIS Web Server, Miscellaneous Web Development
Tags: IE, FF, Chrome
Sign Up Now!
Solution Provided By: tigris_7
Participating Experts: 2
Solution Grade: A
 
[+][-]09/16/08 10:29 PM, ID: 22495728Expert Comment

At Experts Exchange, members can ask their questions to thousands of technology professionals, also known as Experts. Experts compete and collaborate to answer those questions by leaving comments like this one.

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