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POReversing a tsv/csv file or reading only last line using asp.net
 

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  1. POReversing a tsv/csv file or reading only last line using asp.net
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    <p>Hey guys i am pretty much stuck on a problem from last few days. I have a file while is located on a remote server can be access by using userId and password. Well no problem in accessing. </p> <p>Problem is i have around 150 of them. and each of them is of variable size minimum is 2 MB and max is 3 MB.</p> <p>I have to read them one by one and read last row/line data from them. I am doing it in my current code. </p> <p>The main problem is it is taking too much time since it is reading files from top to bottom.</p> <pre><code> public bool TEst(string ControlId, string FileName, long offset) { // The serverUri parameter should use the ftp:// scheme. // It identifies the server file that is to be downloaded // Example: ftp://contoso.com/someFile.txt. // The fileName parameter identifies the local file. //The serverUri parameter identifies the remote file. // The offset parameter specifies where in the server file to start reading data. Uri serverUri; String ftpserver = "ftp://xxx.xxx.xx.xxx/"+FileName; serverUri = new Uri(ftpserver); if (serverUri.Scheme != Uri.UriSchemeFtp) { return false; } // Get the object used to communicate with the server. FtpWebRequest request = (FtpWebRequest)WebRequest.Create(serverUri); request.Credentials = new NetworkCredential("test", "test"); request.Method = WebRequestMethods.Ftp.DownloadFile; //request.Method = WebRequestMethods.Ftp.DownloadFile; request.ContentOffset = offset; FtpWebResponse response = null; try { response = (FtpWebResponse)request.GetResponse(); // long Size = response.ContentLength; } catch (WebException e) { Console.WriteLine(e.Status); Console.WriteLine(e.Message); return false; } // Get the data stream from the response. Stream newFile = response.GetResponseStream(); // Use a StreamReader to simplify reading the response data. StreamReader reader = new StreamReader(newFile); string newFileData = reader.ReadToEnd(); // Append the response data to the local file // using a StreamWriter. string[] parser = newFileData.Split('\t'); string strID = parser[parser.Length - 5]; string strName = parser[parser.Length - 3]; string strStatus = parser[parser.Length-1]; if (strStatus.Trim().ToLower() != "suspect") { HtmlTableCell control = (HtmlTableCell)this.FindControl(ControlId); control.InnerHtml = strName.Split('.')[0]; } else { HtmlTableCell control = (HtmlTableCell)this.FindControl(ControlId); control.InnerHtml = "S"; } // Display the status description. // Cleanup. reader.Close(); response.Close(); //Console.WriteLine("Download restart - status: {0}", response.StatusDescription); return true; } </code></pre> <p>Threading:</p> <pre><code> protected void Page_Load(object sender, EventArgs e) { new Task(()=&gt;this.TEst("controlid1", "file1.tsv", 261454)).Start(); new Task(()=&gt;this.TEst1("controlid2", "file2.tsv", 261454)).Start(); } </code></pre>
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    1. USJames
    1. USJames
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      1. USDeep Sharma
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    1. COJust an idea: Some ftp servers have a resume download function, did you try exploiting the resume function to fake a "seek" and then get the last 'x' kb of data? http://msdn.microsoft.com/en-us/library/system.net.ftpwebrequest.contentoffset.aspx
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      1. USJeremy D
    2. COyour solution is good +1 for it, but while updating the content in the file at remote server it increases its size. so i cannot fix offset.
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      1. USJames
    3. COI'm pretty sure that you can list folder content with sizes of each file
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      1. USJeremy D
 

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