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• How to store millions of pictures about 2k each in size

  - by LuftMensch

  We're creating an ASP.Net MVC site that will need to store 1 million+ pictures, all around 2k-5k in size. From previous ressearch, it looks like a file server is probably better than a db (feel free to comment otherwise). Is there anything special to consider when storing this many files? Are there any issues with Windows being able to find the photo quickly if there are so many files in one folder? Does a segmented directory structure need to be created, for example dividing them up by filename? It would be nice if the solution would scale to at least 10 million pictures for potential future expansion needs.

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• Any info about book "Unix Internals: The New Frontiers" by Uresh Vahalia 2nd edition (Jan 2010)

  - by claws

  This summer I'm getting into UNIX (mostly *BSD) development. I've graduate level knowledge about operating systems. I can also understand the code & read from here and there but the thing is I want to make most of my time. Reading books are best for this. From my search I found that these two books The Design and Implementation of the 4.4 BSD Operating System "Unix Internals: The New Frontiers" by Uresh Vahalia are like established books on UNIX OS internals. But the thing is these books are pretty much outdated. yay!! Lucky me. "Unix Internals: The New Frontiers" by Uresh Vahalia 2 edition (Jan 2010) is released. I've been search for information on this book. Sadly, Amazon says "Out of Print--Limited Availability" & I couldn't find any info regarding this book. This is the information I'm looking for: Table of Contents Whats new in this edition? Where the hell can I buy soft-copy of this book? I really cannot afford buying a hardcopy. How can I contact the author? I've lot of hopes & expectations on this book. I've been waiting for its release for a long time. I've sent random mails to & & requesting to have a proper website for this book. I even contacted publisher for any further information but no replies from any one. If you have any other books that you think will help me. I again repeat, I want to get max possible out of these 2.5 months summer.

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• Using AWK, treate files

  - by Mat

  Hi all, I have something to do that it must be finished before 4.00PM. I want create a batch file with awk, grep or sed that keep all lines beginning with 'INSERT' and delete the other lines. After this, i want replace a string "change)" by "servicechange)" when the 3rd word in the treated line is "donextsit". I don't know how to do this before my deadline (4.00 PM). Please HELP ME!! Thx for your answers. And Sorry for my english ;)

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• Why does DataInputStream not support integers?

  - by Jason

  I need to read in a list of numbers from a file, none of which are larger than 32767. Originally I was going to use the Scanner class to pull in the data, then I read about DataInputStream. This would work well for me, except that according to the API, it supports all primitive variables EXCEPT ints! Listed are longs, shorts, bytes, chars, booleans, ect, but no ints. I have no need for double precision from the incoming data. Is this a deliberate or unintentional oversight?

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• File Encrypt/Decrypt under load?

  - by chopps

  I found an interesting article about encrypting and decrypting files but since it uses a file.dat to store the key this will run into problems when theres alot of users on the site dealing with alot of files. http://www.codeproject.com/KB/security/VernamEncryption.aspx?display=Print Should a new file be created every time a file needs decrypting or would there be a better way to do this? UPDATE: Here is what im using to avoid the locking problems. using (Mutex FileLock = new Mutex(true, System.Guid.NewGuid().ToString())) { try { FileLock.WaitOne(); using (FileStream fs = new FileStream(keyFile, FileMode.Open)) { keyBytes = new byte[fs.Length]; fs.Read(keyBytes, 0, keyBytes.Length); } } catch (Exception ex) { EventLog.LogEvent(ex); } finally { FileLock.ReleaseMutex(); } } I tested it on 1000 TIFFs doing both encryption and decryption without any errors.

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• Write permission for a specific folder in web.config

  - by Simon Dugré

  My question is preaty simple. Is there any way to give current user (IIS User, in this case, ASP NET USER) permission to write to a specific folder location (folder inside our web application) using web.config? Because, it's getting boring to ask to the web hoster to gain access to a specific folder each time we want to do a file uploader on a website. I know it's maybe preaty simple to find an answer using google, but it keeps returning me how to write INTO web.config instead of permission to write into web.config FOR a specific folder. In addition, I'm french so my english is not at the top.

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• java best way to transfer images

  - by d.raev

  I have a application that reads a PDF, transform the content to collection of TIF files, and send them to Glass Fish Server for saving. Usually there are 1-5 pages and it works nice, but when I got a input file with 100+ pages... it throws error on the transfer. Java heap space at java.util.Arrays.copyOf(Arrays.java:2786) at java.io.ByteArrayOutputStream.write(ByteArrayOutputStream.java:94) Putting more resources is not a good option in my case, so I m looking for a way to optimize it somehow. I store the data in: HashMap<TifProfile, List<byte[]> Is there a better way to store or send them ? EDIT I did some tests and the final collections for PDF with 80 pages has size over 280mb (240 tiffs with different settings inside)

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• How to create and update spreadsheet using OLEDB in C#?

  - by vamshi

  HI! all I am creating .xls spreadsheet file using following code using (OleDbConnection conn = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\\temp.xls;Extended Properties='Excel 8.0;HDR=Yes'")) { conn.Open(); OleDbCommand cmd = new OleDbCommand("CREATE TABLE [NewSheet] ([Column1] string, [Column2] string)", conn); cmd.ExecuteNonQuery(); } but i am getting an exception at cmd.ExecuteNonQuery(); Exception is: Cannot modify the design of table 'NewSheet'. It is in a read-only database. Please help me to resolve this Thank You

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• HTTPS with Self-Signed Certificate Issues... Solution or better way?

  - by stormin986

  All I need to do is download some basic text-based and image files from a web server that has a self-signed SSL certificate. I have been trying to figure out how to use HttpClient to do this, but getting the SSL to work is a nightmare that seems to be way too much trouble for such a simple task. Is there a better way to perform these file downloads? Perhaps through a WebView or Browser feature? Reinventing the wheel of making a simple HTTPS GET request is a major pain, and is significantly holding up my development schedule. ** Updated title to more accurately reflect question / solution **

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• Using md5_file(); doesn't return the md5 sometimes?

  - by Rob

  <?php include_once('booter/login/includes/db.php'); $query="SELECT * FROM shells"; $result=mysql_query($query); while($row=mysql_fetch_array($result, MYSQL_ASSOC)){ $hash = @md5_file($row['url']); echo $hash . "<br>"; } ?> The above is my code. Usually it works flawlessly on most urls, but every now and then it will just skip the md5 on a line, as if it doesn't retrieve it, even though the file is there. I can't figure out why. Any ideas?

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• Installing Team Explorer 2008 on Windows Server 2003

  - by BriteShiny

  I am attempting to install Team Explorer 2008 on a Windows Server 2008 box, without success, which is why I am here. The error log reveals the following: [07/02/10,10:07:03] Microsoft Visual Studio 2008 Shell (integrated mode): d:.\wcu\ppe\vside.exe exited with return value 1 [07/02/10,10:07:03] InstallReturnValue: GFN_MID VS PPE, 0x1 [07/02/10,10:07:03] Setup.exe: AddGlobalCustomProperty [07/02/10,10:07:03] Microsoft Visual Studio 2008 Shell (integrated mode): ERRORLOG EVENT : Error code 1 for this component means "Incorrect function. " [07/02/10,10:07:03] Setup.exe: AddGlobalCustomProperty [07/02/10,10:07:03] Microsoft Visual Studio 2008 Shell (integrated mode): ERRORLOG EVENT : Component Microsoft Visual Studio 2008 Shell (integrated mode) returned an unexpected value. [07/02/10,10:07:03] Setup.exe: AddGlobalCustomProperty [07/02/10,10:07:03] Microsoft Visual Studio 2008 Shell (integrated mode): ERRORLOG EVENT : Return from system messaging: Incorrect function. Apparently the Team Explorer 2008 is incompatible with Windows Server 2008. If you right click on the setup.exe in the TFS Explorer ISO and run a compatibility check it fails. There is a separate installer package to install the VS2008 Shell that is compatible with Windows 2008, but it fails too. Has anyone else been able to install Team Explorer 2008 on Windows Server 2008?

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• MVC Serve audio files while preventing direct linking using HttpResponseBase

  - by VinceGeek

  I need to be able to serve audio files to an mvc app while preventing direct access. Ideally the page would render with a player control so the user can start/stop the audio linked to the database record (audio files are in a folder not the db). I have a controller action like this: Response.Clear(); Response.ContentType = "audio/wav"; Response.TransmitFile(audioFilename); Response.End(); return Response; and the view uses the RenderAction method <% Html.RenderAction("ServeAudioFile"); %> this works but it won't display inline on the existing view, it opens a new page with just the media control. Am I totally barking up the wrong tree or is there a way to embed the response in the existing view? works exactly as I would like but I can't control access to the file.

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• Android: How do you delete a folder starts with period

  - by jclova

  I am trying to delete a folder in sdcard. I can delete normal directories, but a directory that starts with period cannot be deleted. (ex. ".helloDir") if (dir.isDirectory()) { String[] children = dir.list(); for (int i = 0; i < children.length; i++) { new File(dir, children[i]).delete(); } } children is null if dir starts with period (ex. ".helloDir").

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• Delphi Search files and directories fastest alghorithm

  - by radu-barbu

  Hi, I'm using Delphi7 and i need a solution to a big problem.Can someone provide me a faster way for searching through files and folders than using findnext and findfirst? because i also process the data for each file/folder (creation date/author/size/etc) and it takes a lot of time...I've searched a lot under WinApi but probably I haven't see the best function in order to accomplish this. All the examples which I've found made in Delphi are using findfirst and findnext... Also, I don't want to buy components or use some free ones... Thanks in advance!

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• Uploading files to server

  - by Shivkumar

  I am trying to upload a file from my Windows application to the server into a particular Folder using C#. However, I am getting an exception: "An exception occurred during a WebClient request". Here is my code: for (int i = 0; i < dtResponseAttach.Rows.Count; i++) { string filePath = dtResponseAttach.Rows[i]["Response"]; WebClient client = new WebClient(); NetworkCredential nc = new NetworkCredential(); Uri addy = new Uri("http://192.168.1.4/people/Attachments/"); client.Credentials = nc; byte[] arrReturn = client.UploadFile(addy, filePath); Console.WriteLine(arrReturn.ToString()); } What could be the reason for this exception?

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• What technologies/tools do people use to implement live websites ?

  - by MadSeb

  Hi, I have the following situation: -I have a server A hooked up to a piece of hardware that sends values and information out of every second. Programs on the server machine can read these values. This server A is in a very remote location so Internet connection is very slow and not reliable but the connection does exist. Let's say it's a weather station in the Arctic. -Users from the home location want to monitorize the weather values somehow. Well, the users can use a remote desktop connection the server A but that would be too too slow. My idea is somehow to have a website on a web server (let's call the webserver - B and B is in a home location ) and make the server A connect to the server B and somehow send values and the web application reads the values and displays them....... but how to do such a system ?? I know I can use MySQL and have the server A connect to a SQL server on server B and send INSERT queries and have the web application running on server B constantly read from the SQL server but I think that would be way way too slow and I think there has to be a better solution. Any ideas ? BTW. The users should be able to send information to the weather station from the website as well ( so an ADMIN user should be allowed to shut down the weather station from the website or whatever) Best regards, MadSeb

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• Performance problems when loading local JSON via <script> elements in IE8

  - by Jens Bannmann

  I have a web page with some JS scripts that needs to work locally, e.g. from hard disk or a CD-ROM. The scripts load JSON data from files by inserting <script> tags. This worked fine in IE6, but now in IE8 it takes an enormous amount of time: it went from "instantly" to 3-10 seconds. The main data file is 45KB large. How can I solve this? I would switch from <script> tags to another method of loading JSON (ideally involving the new native JSON parser), but it seems locally loaded content cannot access the XMLHttpRequest object. Any ideas?

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• PHP: How do I rename a directory where the parent directory is variable?

  - by gsquare567

  i would like to move the files inside uploads/pension/#SOME_VARIABLE_NUMBER#/#SOME_CONSTANT_NUMBER#/ here is my code: // move pension statements // located at uploads/pension/%COMPANY_ID%/%USER_ID%/%HASH% // so just move the %USER_ID% folder to the new company $oldPensionDir = "uploads/pension/" . $demo_user[Users::companyID] . "/" . $demo_user[Users::userID] . "/"; $newPensionDir = "uploads/pension/" . $newCompanyID . "/" . $demo_user[Users::userID] . "/"; // see if the user had any files, and if so, move them if(file_exists($oldPensionDir)) { // if it doesnt exist, make it if(!file_exists($newPensionDir)) mkdir($newPensionDir); // move the folder rename($oldPensionDir, $newPensionDir); } however... when i need to make the directory with the "mkdir" function, i get: mkdir() [<a href='function.mkdir'>function.mkdir</a>]: No such file or directory ok, maybe the mkdir won't work, but what about the rename? perhaps that will make the directory if it's not there... nope! rename(uploads/pension/1001/783/,uploads/pension/1000/783/) [<a href='function.rename'>function.rename</a>]: The system cannot find the path specified. (code: 3) so, there are two errors. i'm pretty sure if the renaming works, i won't even need the mkdir, but who knows... can anyone tell me why these are errors and how to fix them? thanks!

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• webBrower Button Click without element ID?

  - by Jeremy

  I'm working on a login system for a forum and trying to make it work via a c# .net form. I need to programitically click the login button on the forum with a webBrower control. So far I have this. webPage page = new webPage(); page.URL = txtURL.Text; page.Load(); //Load the text from the specified URL WebBrowser browser = new WebBrowser(); browser.Document.GetElementById("navbar_username").SetAttribute("value", textBox1.Text); browser.Document.GetElementById("navbar_password").SetAttribute("value", textBox2.Text); HtmlElement el = browser.Document.All["btnI"]; if (el != null) { el.InvokeMember("click"); } else { MessageBox.Show("There is an issue with the program"); } The issue is that the login button on the page does not have an ID or any real information that can allow me to click on it. Does anyone have any suggestions? Here is the code for the login button. <input type="image" src="images/loginbutton.png" class="loginbutton" tabindex="104" value="Log in" title="Enter your username and password in the boxes provided to login, or click the 'register' button to create a profile for yourself." accesskey="s">

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• How to find a string on document and then echo the string?

  - by henrymb67

  How do you find a string on document and then echo the string? For example, The document: blah blah result.php?whatiwanttoecho blah or: blahhh result.php?whatiwanttoecho blah blah blah There will always be 'result.php?' before what I want to echo. The end result I'm looking for: $doc = "./doc.txt"; $doccontents = file_get_contents($file); Then the code that I need help that has the end result of: $result = 'whatiwanttoecho'; echo $result; Hope this makes sense. Thanks (:

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• Is something along the lines of nested memoization needed here?

  - by Daniel

  System.Transactions notoriously escalates transactions involving multiple connections to the same database to the DTC. The module and helper class, ConnectionContext, below are meant to prevent this by ensuring multiple connection requests for the same database return the same connection object. This is, in some sense, memoization, although there are multiple things being memoized and the second is dependent on the first. Is there some way to hide the synchronization and/or mutable state (perhaps using memoization) in this module, or perhaps rewrite it in a more functional style? (It may be worth nothing that there's no locking when getting the connection by connection string because Transaction.Current is ThreadStatic.) type ConnectionContext(connection:IDbConnection, ownsConnection) = member x.Connection = connection member x.OwnsConnection = ownsConnection interface IDisposable with member x.Dispose() = if ownsConnection then connection.Dispose() module ConnectionManager = let private _connections = new Dictionary<string, Dictionary<string, IDbConnection>>() let private getTid (t:Transaction) = t.TransactionInformation.LocalIdentifier let private removeConnection tid = let cl = _connections.[tid] for (KeyValue(_, con)) in cl do con.Close() lock _connections (fun () -> _connections.Remove(tid) |> ignore) let getConnection connectionString (openConnection:(unit -> IDbConnection)) = match Transaction.Current with | null -> new ConnectionContext(openConnection(), true) | current -> let tid = getTid current // get connections for the current transaction let connections = match _connections.TryGetValue(tid) with | true, cl -> cl | false, _ -> let cl = Dictionary<_,_>() lock _connections (fun () -> _connections.Add(tid, cl)) cl // find connection for this connection string let connection = match connections.TryGetValue(connectionString) with | true, con -> con | false, _ -> let initial = (connections.Count = 0) let con = openConnection() connections.Add(connectionString, con) // if this is the first connection for this transaction, register connections for cleanup if initial then current.TransactionCompleted.Add (fun args -> let id = getTid args.Transaction removeConnection id) con new ConnectionContext(connection, false)

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• How to buffer stdout in memory and write it from a dedicated thread

  - by NickB

  I have a C application with many worker threads. It is essential that these do not block so where the worker threads need to write to a file on disk, I have them write to a circular buffer in memory, and then have a dedicated thread for writing that buffer to disk. The worker threads do not block any more. The dedicated thread can safely block while writing to disk without affecting the worker threads (it does not hold a lock while writing to disk). My memory buffer is tuned to be sufficiently large that the writer thread can keep up. This all works great. My question is, how do I implement something similar for stdout? I could macro printf() to write into a memory buffer, but I don't have control over all the code that might write to stdout (some of it is in third-party libraries). Thoughts? NickB

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• Why does this bash command take up all space on device?

  - by chelmertz

  Hey! I'm a little new on searching via bash, so feel free to give me suggestions on the methods to use instead of this, which I'll never use again :) I'm searching for occurances of a string, recursively in a directory, with ~50 not-that-large php-files in it; some in current directory, some in directories beneath current dir, three levels of directories down at most. The method I'm using is: find . | xargs grep "module" > module.txt When in simple (one level) directories, this works fine, but in this case, the file became 4 GB large until it filled up all space on the partition :) It wasn't even done yet.. Would someone educate me so I won't embarass myself again?

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• Simple XML parsing error

  - by phpeffedup

  I'm trying to iterate through a Twitter XML File, where the container tag is , and each user is . I need to create a variable $id based on the XML attribute for each user. Username is already instantiated. $url = "http://api.twitter.com/1/statuses/friends/$username.xml"; $xmlpure = file_get_contents($url); $listxml = simplexml_load_string($xmlpure); foreach($listxml->users->children() as $child) { $id = $child->{"id"}; //Do another action } But I'm getting this error: Warning: main() [function.main]: Node no longer exists in /home/.../bonus.php on line 32 Line 32 is the foreach statement, and I don't actually USE the main() method. What am I doing wrong?

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• How can I allow only privledged users to download a pdf with php?

  - by ThinkingInBits

  Lets say I have some pdf files stored on my server and I only want to allow a person who's paid have access to download a particular pdf. So for an example, let's say I have a bunch of e-books. The only way a user would be able to download e-book A is if his account contains the right credentials for that particular book. What's the best way to accomplish this? Any ideas/advice on how to improve my idea are greatly appreciated! My current idea: A user places an order Upon success, a new folder would be created by their /account_num/order_id/ A copy of the particular file would be stored in this directory Have php generate an .htaccess that would only allow access from a url that contains a random hash embedded into it. The only way a user would be able to access this random hashed page is if they are signed in as the right user, and the hash matches up with the hash stored in the database, otherwise they are redirected to home page.

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