practical answers - Page 268

Unaccounted for database size

- by Nazadus

I currently have a database that is 20GB in size. I've run a few scripts which show on each tables size (and other incredibly useful information such as index stuff) and the biggest table is 1.1 million records which takes up 150MB of data. We have less than 50 tables most of which take up less than 1MB of data. After looking at the size of each table I don't understand why the database shouldn't be 1GB in size after a shrink. The amount of available free space that SqlServer (2005) reports is 0%. The log mode is set to simple. At this point my main concern is I feel like I have 19GB of unaccounted for used space. Is there something else I should look at? Normally I wouldn't care and would make this a passive research project except this particular situation calls for us to do a backup and restore on a weekly basis to put a copy on a satellite (which has no internet, so it must be done manually). I'd much rather copy 1GB (or even if it were down to 5GB!) than 20GB of data each week. sp_spaceused reports the following: Navigator-Production 19184.56 MB 3.02 MB And the second part of it: 19640872 KB 19512112 KB 108184 KB 20576 KB while I've found a few other scripts (such as the one from two of the server database size questions here, they all report the same information either found above or below). The script I am using is from SqlTeam. Here is the header info: * BigTables.sql * Bill Graziano (SQLTeam.com) * graz@<email removed> * v1.11 The top few tables show this (table, rows, reserved space, data, index, unused, etc): Activity 1143639 131 MB 89 MB 41768 KB 1648 KB 46% 1% EventAttendance 883261 90 MB 58 MB 32264 KB 328 KB 54% 0% Person 113437 31 MB 15 MB 15752 KB 912 KB 103% 3% HouseholdMember 113443 12 MB 6 MB 5224 KB 432 KB 82% 4% PostalAddress 48870 8 MB 6 MB 2200 KB 280 KB 36% 3% The rest of the tables are either the same in size or smaller. No more than 50 tables. Update 1: - All tables use unique identifiers. Usually an int incremented by 1 per row. I've also re-indexed everything. I ran the dbcc shrink command as well as updating the usage before and after. And over and over. An interesting thing I found is that when I restarted the server and confirmed no one was using it (and no maintenance procs are running, this is a very new application -- under a week old) and when I went to run the shrink, every now and then it would say something about data changed. Googling yielded too few useful answers with the obvious not applying (it was 1am and I disconnected everyone, so it seems impossible that was really the case). The data was migrated via C# code which basically looked at another server and brought things over. The quantity of deletes, at this point in time, are probably under 50k in rows. Even if those rows were the biggest rows, that wouldn't be more than 100M I would imagine. When I go to shrink via the GUI it reports 0% available to shrink, indicating that I've already gotten it as small as it thinks it can go. Update 2: sp_spaceused 'Activity' yields this (which seems right on the money): Activity 1143639 134488 KB 91072 KB 41768 KB 1648 KB Fill factor was 90. All primary keys are ints. Here is the command I used to 'updateusage': DBCC UPDATEUSAGE(0); Update 3: Per Edosoft's request: Image 111975 2407773 19262184 It appears as though the image table believes it's the 19GB portion. I don't understand what this means though. Is it really 19GB or is it misrepresented? Update 4: Talking to a co-worker and I found out that it's because of the pages, as someone else here has also state the potential for that. The only index on the image table is a clustered PK. Is this something I can fix or do I just have to deal with it? The regular script shows the Image table to be 6MB in size. Update 5: I think I'm just going to have to deal with it after further research. The images have been resized to be roughly 2-5KB each and on a normal file system doesn't consume much space but on SqlServer it seems to consume considerably more. The real answer, in the long run, will likely be separating that table in to another partition or something similar.

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ASP.NET RememberMe(It's large, please don't quit reading. Have explained the problem in detail and s

- by nccsbim071

After searching a lot i did not get any answers and finally i had to get back to you. Below i am explaining my problem in detail. It's too long, so please don't quit reading. I have explained my problem in simple language. I have been developing an asp.net mvc project. I am using standard ASP.NET roles and membership. Everything is working fine but the remember me functionality doesn't work at all. I am listing all the details of work. Hope you guys can help me out solve this problem. I simply need this: I need user to login to web application. During login they can either login with remember me or without it. If user logs in with remember me, i want browser to remember them for long time, let's say atleast one year or considerably long time. The way they do it in www.dotnetspider.com,www.codeproject.com,www.daniweb.com and many other sites. If user logs in without remember me, then browser should allow access to website for some 20 -30 minutes and after that their session should expire. Their session should also expire when user logs in and shuts down the browser without logging out. Note: I have succesfully implemented above functionality without using standard asp.net roles and membership by creating my own talbes for user and authenticating against my database table, setting cookie and sessions in my other projects. But for this project we starting from the beginning used standard asp.net roles and membership. We thought it will work and after everything was build at the time of testing it just didn't work. and now we cannot replace the existing functionality with standard asp.net roles and membership with my own custom user tables and all the stuff, you understand what i am taling about. Either there is some kind of bug with standard asp.net roles and membership functionality or i have the whole concept of standard asp.net roles and membership wrong. i have stated what i want above. I think it's very simple and reasonable. What i did Login form with username,password and remember me field. My setting in web.config: in My controller action, i have this: FormsAuth.SignIn(userName, rememberMe); public void SignIn(string userName, bool createPersistentCookie) { FormsAuthentication.SetAuthCookie(userName, createPersistentCookie); } Now the problems are following: I have already stated in above section "I simply need this". user can successfully log in to the system. Their session exists for as much minutes as specified in timeout value in web.config. I have also given a sample of my web.config. In my samplem if i set the timeout to 5 minutes,then user session expires after 5 minutes, that's ok. But if user closes the browser and reopen the browser, user can still enter the website without loggin in untill time specified in "timeout" has not passed out. The sliding expiration for timeout value is also working fine. Now if user logs in to the system with remember me checked, user session still expires after 5 minutes. This is not good behaviour, is it?. I mean to say that if user logs in to the system with remember me checked he should be remembered for a long time untill he doesn't logs out of the system or user doesn't manually deletes all the cookies from the browser. If user logs in to the system without remember me checked his session should expire after the timeout period values specified in web.config and also if users closes the browser. The problem is that if user closes the browser and reopens it he can still enter the website without logging in. I search internet a lot on this topic, but i could not get the solution. In the blog post(http://weblogs.asp.net/scottgu/archive/2005/11/08/430011.aspx) made by Scott Gu on exactly the same topic. The users are complaining about the same thing in their comments ut there is no easy solution given in by Mr. Scott. I read it at following places: http://weblogs.asp.net/scottgu/archive/2005/11/08/430011.aspx http://geekswithblogs.net/vivek/archive/2006/09/14/91191.aspx I guess this is a problem of lot's of users. As seem from blog post made by Mr. Scott Gu. Your help will be really appreciated. Thanks in advance.

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How to simulate browser file upload with HttpWebRequest

- by cucicov

Hi, guys, first of all thanks for your contributions, I've found great responses here. Yet I've ran into a problem I can't figure out and if someone could provide any help, it would be greatly appreciated. I'm developing this application in C# that could upload an image from computer to user photoblog. For this I'm usig pixelpost platform for photoblogs that is written mainly in PHP. I've searched here and on other web pages, but the exmples provided there didn't work for me. Here is what I used in my example: (http://stackoverflow.com/questions/566462/upload-files-with-httpwebrequest-multipart-form-data) and (http://bytes.com/topic/c-sharp/answers/268661-how-upload-file-via-c-code) Once it is ready I will make it available for free on the internet and maybe also create a windows mobile version of it, since I'm a fan of pixelpost. here is the code I've used: string formUrl = "http://localhost/pixelpost/admin/index.php?x=login"; string formParams = string.Format("user={0}&password={1}", "user-String", "password-String"); string cookieHeader; HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(formUrl); req.ContentType = "application/x-www-form-urlencoded"; req.Method = "POST"; req.AllowAutoRedirect = false; byte[] bytes = Encoding.ASCII.GetBytes(formParams); req.ContentLength = bytes.Length; using (Stream os = req.GetRequestStream()) { os.Write(bytes, 0, bytes.Length); } HttpWebResponse resp = (HttpWebResponse)req.GetResponse(); cookieHeader = resp.Headers["Set-Cookie"]; string pageSource; using (StreamReader sr = new StreamReader(resp.GetResponseStream())) { pageSource = sr.ReadToEnd(); Console.WriteLine(); } string getUrl = "http://localhost/pixelpost/admin/index.php"; HttpWebRequest getRequest = (HttpWebRequest)HttpWebRequest.Create(getUrl); getRequest.Headers.Add("Cookie", cookieHeader); HttpWebResponse getResponse = (HttpWebResponse)getRequest.GetResponse(); using (StreamReader sr = new StreamReader(getResponse.GetResponseStream())) { pageSource = sr.ReadToEnd(); } // end first part: login to admin panel long length = 0; string boundary = "----------------------------" + DateTime.Now.Ticks.ToString("x"); HttpWebRequest httpWebRequest2 = (HttpWebRequest)WebRequest.Create("http://localhost/pixelpost/admin/index.php?x=save"); httpWebRequest2.ContentType = "multipart/form-data; boundary=" + boundary; httpWebRequest2.Method = "POST"; httpWebRequest2.AllowAutoRedirect = false; httpWebRequest2.KeepAlive = false; httpWebRequest2.Credentials = System.Net.CredentialCache.DefaultCredentials; httpWebRequest2.Headers.Add("Cookie", cookieHeader); Stream memStream = new System.IO.MemoryStream(); byte[] boundarybytes = System.Text.Encoding.ASCII.GetBytes("\r\n--" + boundary + "\r\n"); string formdataTemplate = "\r\n--" + boundary + "\r\nContent-Disposition: form-data; name=\"{0}\";\r\n\r\n{1}"; string formitem = string.Format(formdataTemplate, "headline", "image-name"); byte[] formitembytes = System.Text.Encoding.UTF8.GetBytes(formitem); memStream.Write(formitembytes, 0, formitembytes.Length); memStream.Write(boundarybytes, 0, boundarybytes.Length); string headerTemplate = "\r\nContent-Disposition: form-data; name=\"{0}\"; filename=\"{1}\"\r\nContent-Type: application/octet-stream\r\n\r\n"; string header = string.Format(headerTemplate, "userfile", "path-to-the-local-file"); byte[] headerbytes = System.Text.Encoding.UTF8.GetBytes(header); memStream.Write(headerbytes, 0, headerbytes.Length); FileStream fileStream = new FileStream("path-to-the-local-file", FileMode.Open, FileAccess.Read); byte[] buffer = new byte[1024]; int bytesRead = 0; while ((bytesRead = fileStream.Read(buffer, 0, buffer.Length)) != 0) { memStream.Write(buffer, 0, bytesRead); } memStream.Write(boundarybytes, 0, boundarybytes.Length); fileStream.Close(); httpWebRequest2.ContentLength = memStream.Length; Stream requestStream = httpWebRequest2.GetRequestStream(); memStream.Position = 0; byte[] tempBuffer = new byte[memStream.Length]; memStream.Read(tempBuffer, 0, tempBuffer.Length); memStream.Close(); requestStream.Write(tempBuffer, 0, tempBuffer.Length); requestStream.Close(); WebResponse webResponse2 = httpWebRequest2.GetResponse(); Stream stream2 = webResponse2.GetResponseStream(); StreamReader reader2 = new StreamReader(stream2); Console.WriteLine(reader2.ReadToEnd()); webResponse2.Close(); httpWebRequest2 = null; webResponse2 = null; and also here is the PHP: (http://dl.dropbox.com/u/3149888/index.php) and (http://dl.dropbox.com/u/3149888/new_image.php) the mandatory fields are headline and userfile so I can't figure out where the mistake is, as the format sent in right. I'm guessing there is something wrong with the octet-stream sent to the form. Maybe it's a stupid mistake I wasn't able to trace, in any case, if you could help me that would mean a lot. thanks,

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Very simple, terse and easy GUI programming “frameworks”

- by jetxee

Please list GUI programming libraries, toolkits, frameworks which allow to write GUI apps quickly. I mean in such a way, that GUI is described entirely in a human-readable (and human-writable) plain text file (code) code is terse (1 or 2 lines of code per widget/event pair), suitable for scripting structure and operation of the GUI is evident from the code (nesting of widgets and flow of events) details about how to build the GUI are hidden (things like mainloop, attaching event listeners, etc.) auto-layouts are supported (vboxes, hboxes, etc.) As answers suggest, this may be defined as declarative GUI programming, but it is not necessarily such. Any approach is OK if it works, is easy to use and terse. There are some GUI libraries/toolkits like this. They are listed below. Please extend the list if you see a qualifying toolkit missing. Indicate if the project is crossplatform, mature, active, and give an example if possible. Please use this wiki to discuss only Open Source projects. This is the list so far (in alphabetical order): Fudgets Fudgets is a Haskell library. Platform: Unix. Status: Experimental, but still maintained. An example: import Fudgets main = fudlogue (shellF "Hello" (labelF "Hello, world!" >+< quitButtonF)) GNUstep Renaissance Renaissance allows to describe GUI in simple XML. Platforms: OSX/GNUstep. Status: part of GNUstep. An example below: <window title="Example"> <vbox> <label font="big"> Click the button below to quit the application </label> <button title="Quit" action="terminate:"/> </vbox> </window> HTML HTML-based GUI (HTML + JS). Crossplatform, mature. Can be used entirely on the client side. Looking for a nice “helloworld” example. JavaFX JavaFX is usable for standalone (desktop) apps as well as for web applications. Not completely crossplatform, not yet completely open source. Status: 1.0 release. An example: Frame { content: Button { text: "Press Me" action: operation() { System.out.println("You pressed me"); } } visible: true } Screenshot is needed. Phooey Phooey is another Haskell library. Crossplatform (wxWidgets), HTML+JS backend planned. Mature and active. An example (a little more than a helloworld): ui1 :: UI () ui1 = title "Shopping List" $ do a <- title "apples" $ islider (0,10) 3 b <- title "bananas" $ islider (0,10) 7 title "total" $ showDisplay (liftA2 (+) a b) PythonCard PythonCard describes GUI in a Python dictionary. Crossplatform (wxWidgets). Some apps use it, but the project seems stalled. There is an active fork. I skip PythonCard example because it is too verbose for the contest. Shoes Shoes for Ruby. Platforms: Win/OSX/GTK+. Status: Young but active. A minimal app looks like this: Shoes.app { @push = button "Push me" @note = para "Nothing pushed so far" @push.click { @note.replace "Aha! Click!" } } Tcl/Tk Tcl/Tk. Crossplatform (its own widget set). Mature (probably even dated) and active. An example: #!/usr/bin/env wish button .hello -text "Hello, World!" -command { exit } pack .hello tkwait window . tekUI tekUI for Lua (and C). Platforms: X11, DirectFB. Status: Alpha (usable, but API still evolves). An example: #/usr/bin/env lua ui = require "tek.ui" ui.Application:new { Children = { ui.Window:new { Title = "Hello", Children = { ui.Text:new { Text = "_Hello, World!", Style = "button", Mode = "button", }, }, }, }, }:run() Treethon Treethon for Python. It describes GUI in a YAML file (Python in a YAML tree). Platform: GTK+. Status: work in proress. A simple app looks like this: _import: gtk view: gtk.Window() add: - view: gtk.Button('Hello World') on clicked: print view.get_label() Yet unnamed Python library by Richard Jones: This one is not released yet. The idea is to use Python context managers (with keyword) to structure GUI code. See Richard Jones' blog for details. with gui.vertical: text = gui.label('hello!') items = gui.selection(['one', 'two', 'three']) with gui.button('click me!'): def on_click(): text.value = items.value text.foreground = red XUL XUL + Javascript may be used to create stand-alone desktop apps with XULRunner as well as Mozilla extensions. Mature, open source, crossplatform. <?xml version="1.0"?> <?xml-stylesheet href="chrome://global/skin/" type="text/css"?> <window id="main" title="My App" width="300" height="300" xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"> <caption label="Hello World"/> </window> Thank your for contributions!

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Wiring up JavaScript handlers after a Partial Postback in ASP.NET

- by Richard

I am trying to use LinkButtons with the DefaultButton property of the ASP.NET Panel in an UpdatePanel. I have read and used the various other answers that are around describing the wiring up of the click event so that a full postback is not done instead of a partial postback. When the page loads, I wire up the .click function of the LinkButton so that the DefaultButton property of the ASP.NET panel will work. This all works fine, until you bring an UpdatePanel into the mix. With an UpdatePanel, if there is a partial postback, the script to wire up the .click function is not called in the partial postback, and hitting enter reverts to causing a full submit of the form rather than triggering the LinkButton. How can I cause javascript to be executed after a partial postback to re-wire up the .click function of the LinkButton? I have produced a sample page which shows the problem. There are two alerts showing 1) When the code to hook up the .click function is being called, and 2) When the .click function has been called (this only happens when you hit enter in the textbox after the event has been wired up). To test this code, type something in the textbox and hit Enter. The text will be copied to the label control, but "Wiring up Event Click" alert will not be shown. Add another letter, hit enter again, and you'll get a full postback without the text being copied to the label control (as the LinkButton wasn't called). Because that was a full postback, the Wiring Up Event Click event will be called again, and the form will work properly the next time again. This is being done with ASP.NET 3.5. Test Case Code: <%@ Page Language="C#" Inherits="System.Web.UI.Page" Theme="" EnableTheming="false" AutoEventWireup="true" %> <script runat="server"> void cmdComplete_Click(object sender, EventArgs e) { lblOutput.Text = "Complete Pressed: " + txtInput.Text; } void cmdFirstButton_Click(object sender, EventArgs e) { lblOutput.Text = "First Button Pressed"; } protected override void OnLoad(EventArgs e) { HookupButton(cmdComplete); } void HookupButton(LinkButton button) { // Use the click event of the LinkButton to trigger the postback (this is used by the .click code below) button.OnClientClick = Page.ClientScript.GetPostBackEventReference(button, String.Empty); // Wire up the .click event of the button to call the onclick function, and prevent a form submit string clickString = string.Format(@" alert('Wiring up click event'); document.getElementById('{0}').click = function() {{ alert('Default button pressed'); document.getElementById('{0}').onclick(); }};", button.ClientID, Page.ClientScript.GetPostBackEventReference(button, "")); Page.ClientScript.RegisterStartupScript(button.GetType(), "click_hookup_" + button.ClientID, clickString, true); } </script> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html> <head> <title>DefaultButton/LinkButton Testing</title> <style type="text/css"> a.Button { line-height: 2em; padding: 5px; border: solid 1px #CCC; background-color: #EEE; } </style> </head> <body> <h1> DefaultButton/LinkButton Testing</h1> <form runat="server"> <asp:ScriptManager runat="server" /> <asp:UpdatePanel ID="UpdatePanel1" runat="server"> <ContentTemplate> <div style="position: relative"> <fieldset> <legend>Output</legend> <asp:Label runat="server" ID="lblOutput" /> </fieldset> <asp:Button runat="server" Text="First Button" ID="cmdFirstButton" OnClick="cmdFirstButton_Click" UseSubmitBehavior="false" /> <asp:Panel ID="Panel1" runat="server" DefaultButton="cmdComplete"> <label> Enter Text:</label> <asp:TextBox runat="server" ID="txtInput" /> <asp:LinkButton runat="server" CssClass="Button" ID="cmdComplete" OnClick="cmdComplete_Click" Text="Complete" /> </asp:Panel> </div> </ContentTemplate> </asp:UpdatePanel> <asp:Button runat="server" ID="cmdFullPostback" Text="Full Postback" /> </form> </body> </html>

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Conditional Validation using JQuery Validation Plugin

- by Steve Kemp

I have a simple html form that I've added validation to using the JQuery Validation plugin. I have it working for single fields that require a value. I now need to extend that so that if a user answers Yes to a question they must enter something in the Details field, otherwise the Details field can be left blank. I'm using radio buttons to display the Yes/No. Here's my complete html form - I'm not sure where to go from here: <script type="text/javascript" charset="utf-8"> $.metadata.setType("attr", "validate"); $(document).ready(function() { $("#editRecord").validate(); }); </script> <style type="text/css"> .block { display: block; } form.cmxform label.error { display: none; } </style> </head> <body> <div id="header"> <h1> Questions</h1> </div> <div id="content"> <h1> Questions Page 1 </h1> </div> <div id="content"> <h1> </h1> <form class="cmxform" method="post" action="editrecord.php" id="editRecord"> <input type="hidden" name="-action" value="edit"> <h1> Questions </h1> <table width="46%" class="record"> <tr> <td width="21%" valign="top" class="field_name_left"><p>Question 1</p></td> <td width="15%" valign="top" class="field_data"> <label for="Yes"> <input type="radio" name="Question1" value="Yes" validate = "required:true" /> Yes </label> <label for="No"> <input type="radio" name="Question1" value="No" /> No </label> <label for="Question1" class="error">You must answer this question to proceed</label> </td> <td width="64%" valign="top" class="field_data"><strong>Details:</strong> <textarea id = "Details1" class="where" name="Details1" cols="25" rows="2"></textarea></td> </tr> <tr> <td valign="top" class="field_name_left">Question 2</td> <td valign="top" class="field_data"> <label for="Yes"> <input type="radio" name="Question2" value="Yes" validate = "required:true" /> Yes </label> <label for="No"> <input type="radio" name="Question2" value="No" /> No </label> <label for="Question2" class="error">You must answer this question to proceed</label> </td> <td valign="top" class="field_data"><strong>Details:</strong> <textarea id = "Details2" class="where" name="Details2" cols="25" rows="2"></textarea> </td> </tr> <tr class="submit_btn"> <td colspan="3"> <input type="submit" name="-edit" value="Finish"> <input type="reset" name="reset" value="Reset"> </td> </tr> </table> </form> </div> </body> </html>

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Factorising program not working. Help required.

- by Ender

I am working on a factorisation problem using Fermat's Factorization and for small numbers it is working well. I've been able to calculate the factors (getting the answers from Wolfram Alpha) for small numbers, like the one on the Wikipedia page (5959). Just when I thought I had the problem licked I soon realised that my program was not working when it came to larger numbers. The program follows through the examples from the Wikipedia page, printing out the values a, b, a2 and b2; the results printed for large numbers are not correct. I've followed the pseudocode provided on the Wikipedia page, but am struggling to understand where to go next. Along with the Wikipedia page I have been following this guide. Once again, as my Math knowledge is pretty poor I cannot follow what I need to do next. The code I am using so far is as follows: import java.math.BigInteger; /** * * @author AlexT */ public class Fermat { private BigInteger a, b; private BigInteger b2; private static final BigInteger TWO = BigInteger.valueOf(2); public void fermat(BigInteger N) { // floor(sqrt(N)) BigInteger tmp = getIntSqrt(N); // a <- ceil(sqrt(N)) a = tmp.add(BigInteger.ONE); // b2 <- a*a-N b2 = (a.multiply(a)).subtract(N); final int bitLength = N.bitLength(); BigInteger root = BigInteger.ONE.shiftLeft(bitLength / 2); root = root.add(b2.divide(root)).divide(TWO); // while b2 not square root while(!(isSqrt(b2, root))) { // a <- a + 1 a = a.add(BigInteger.ONE); // b2 <- (a * a) - N b2 = (a.multiply(a)).subtract(N); root = root.add(b2.divide(root)).divide(TWO); } b = getIntSqrt(b2); BigInteger a2 = a.pow(2); // Wrong BigInteger sum = (a.subtract(b)).multiply((a.add(b))); //if(sum.compareTo(N) == 0) { System.out.println("A: " + a + "\nB: " + b); System.out.println("A^2: " + a2 + "\nB^2: " + b2); //} } /** * Is the number provided a perfect Square Root? * @param n * @param root * @return */ private static boolean isSqrt(BigInteger n, BigInteger root) { final BigInteger lowerBound = root.pow(2); final BigInteger upperBound = root.add(BigInteger.ONE).pow(2); return lowerBound.compareTo(n) <= 0 && n.compareTo(upperBound) < 0; } public BigInteger getIntSqrt(BigInteger x) { // It returns s where s^2 < x < (s+1)^2 BigInteger s; // final result BigInteger currentRes = BigInteger.valueOf(0); // init value is 0 BigInteger currentSum = BigInteger.valueOf(0); // init value is 0 BigInteger sum = BigInteger.valueOf(0); String xS = x.toString(); // change input x to a string xS int lengthOfxS = xS.length(); int currentTwoBits; int i=0; // index if(lengthOfxS % 2 != 0) {// if odd length, add a dummy bit xS = "0".concat(xS); // add 0 to the front of string xS lengthOfxS++; } while(i < lengthOfxS){ // go through xS two by two, left to right currentTwoBits = Integer.valueOf(xS.substring(i,i+2)); i += 2; // sum = currentSum*100 + currentTwoBits sum = currentSum.multiply(BigInteger.valueOf(100)); sum = sum.add(BigInteger.valueOf(currentTwoBits)); // subtraction loop do { currentSum = sum; // remember the value before subtract // in next 3 lines, we work out // currentRes = sum - 2*currentRes - 1 sum = sum.subtract(currentRes); // currentRes++ currentRes = currentRes.add(BigInteger.valueOf(1)); sum = sum.subtract(currentRes); } while(sum.compareTo(BigInteger.valueOf(0)) >= 0); // the loop stops when sum < 0 // go one step back currentRes = currentRes.subtract(BigInteger.valueOf(1)); currentRes = currentRes.multiply(BigInteger.valueOf(10)); } s = currentRes.divide(BigInteger.valueOf(10)); // go one step back return s; } /** * @param args the command line arguments */ public static void main(String[] args) { Fermat fermat = new Fermat(); //Works //fermat.fermat(new BigInteger("5959")); // Doesn't Work fermat.fermat(new BigInteger("90283")); } } If anyone can help me out with this problem I'll be eternally grateful.

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Rails: Need a helping hand to finish this Jquery/Ajax problem.

- by DJTripleThreat

Here's my problem: I have a combo box that when its index changes I want a div tag with the id="services" to repopulate with checkboxes based on that comboboxes value. I want this to be done using ajax. This is my first time working with ajax for rails so I need a helping hand. Here is what I have so far: My application.js file. Something that Ryan uses in one of his railscasts. This is supposed to be a helper method for handling ajax requests. Is this useful? Should I be using this?: //<![CDATA[ $.ajaxSetup({ 'beforeSend': function(xhr) {xhr.setRequestHeader("Accept","text/javascript")} }); // This function doesn't return any results. How might I change that? Or // should I have another function to do that? $.fn.submitWithAjax = function() { this.submit(function() { $.post($(this).attr("action"), $(this).serialize(), null, "script"); return true; }); }; //]]> An external javascript file for this template (/public/javascripts/combo_box.js): //<![CDATA[ $(document).ready(function(){ $('#event_service_time_allotment').change(function () { // maybe I should be using submitWithAjax(); ?? $(this).parent().submit(); }); }); //]]> My ???.js.erb file. I'm not sure where this file should go. Should I make an ajax controller?? Someone help me out with that part please. I can write this code no problem, I just need to know where it should go and what the file name should be called (best practices etc): // new.js.erb: dynamic choices... expecting a time_allotment alert('test'); // TODO: Return a json object or something with a result set of services // I should be expecting something like: // params[:event_service][:time_allotment] i think which I should use // to return a json object (??) to be parsed or rendered html // for the div#services. Here is my controller's new action. Am I supposed to respond to javascript here? Should I make an ajax controller instead? What's the best way to do this?: # /app/controllers/event_services_controller.rb def new @event_service = EventService.new respond_to do |format| format.html # new.html.erb format.xml { render :xml => @event_service } format.js # should I have a javascript handler here? i'm lost! end end My /app/views/event_service/new.html.erb. My ajax call I think should be a different action then the form: <% content_for :head do %> <%= javascript_include_tag '/javascripts/combo_box.js' %> <% end %> <% form_for @event_service, :url => admin_events_path, :html => {:method => :post} do |f| %>   <%= select("event_service", "time_allotment", TimeAllotment.all.collect {|ta| [ta.title, ta.value]}, {:prompt => true}) %> Services:  <div id="services"> <% for service_type in ServiceType.all %> <div> <%= check_box_tag "event_service[service_type_ids][]", service_type.id, false %> <%=h service_type.title %> </div> <% end %> </div> <% end %> ok so right now ALL of the services are there to be chosen from. I want them to change based on what is selected in the combobox event_service_time_allotment. Thanks, I know this is super complicated so any helpful answers will get an upvote.

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How to implement Cocoa copyWithZone on derived object in MonoMac C#?

- by Justin Aquadro

I'm currently porting a small Winforms-based .NET application to use a native Mac front-end with MonoMac. The application has a TreeControl with icons and text, which does not exist out of the box in Cocoa. So far, I've ported almost all of the ImageAndTextCell code in Apple's DragNDrop example: https://developer.apple.com/library/mac/#samplecode/DragNDropOutlineView/Listings/ImageAndTextCell_m.html#//apple_ref/doc/uid/DTS40008831-ImageAndTextCell_m-DontLinkElementID_6, which is assigned to an NSOutlineView as a custom cell. It seems to be working almost perfectly, except that I have not figured out how to properly port the copyWithZone method. Unfortunately, this means the internal copies that NSOutlineView is making do not have the image field, and it leads to the images briefly vanishing during expand and collapse operations. The objective-c code in question is: - (id)copyWithZone:(NSZone *)zone { ImageAndTextCell *cell = (ImageAndTextCell *)[super copyWithZone:zone]; // The image ivar will be directly copied; we need to retain or copy it. cell->image = [image retain]; return cell; } The first line is what's tripping me up, as MonoMac does not expose a copyWithZone method, and I don't know how to otherwise call it. Update Based on current answers and additional research and testing, I've come up with a variety of models for copying an object. static List<ImageAndTextCell> _refPool = new List<ImageAndTextCell>(); // Method 1 static IntPtr selRetain = Selector.GetHandle ("retain"); [Export("copyWithZone:")] public virtual NSObject CopyWithZone(IntPtr zone) { ImageAndTextCell cell = new ImageAndTextCell() { Title = Title, Image = Image, }; Messaging.void_objc_msgSend (cell.Handle, selRetain); return cell; } // Method 2 [Export("copyWithZone:")] public virtual NSObject CopyWithZone(IntPtr zone) { ImageAndTextCell cell = new ImageAndTextCell() { Title = Title, Image = Image, }; _refPool.Add(cell); return cell; } [Export("dealloc")] public void Dealloc () { _refPool.Remove(this); this.Dispose(); } // Method 3 static IntPtr selRetain = Selector.GetHandle ("retain"); [Export("copyWithZone:")] public virtual NSObject CopyWithZone(IntPtr zone) { ImageAndTextCell cell = new ImageAndTextCell() { Title = Title, Image = Image, }; _refPool.Add(cell); Messaging.void_objc_msgSend (cell.Handle, selRetain); return cell; } // Method 4 static IntPtr selRetain = Selector.GetHandle ("retain"); static IntPtr selRetainCount = Selector.GetHandle("retainCount"); [Export("copyWithZone:")] public virtual NSObject CopyWithZone (IntPtr zone) { ImageAndTextCell cell = new ImageAndTextCell () { Title = Title, Image = Image, }; _refPool.Add (cell); Messaging.void_objc_msgSend (cell.Handle, selRetain); return cell; } public void PeriodicCleanup () { List<ImageAndTextCell> markedForDelete = new List<ImageAndTextCell> (); foreach (ImageAndTextCell cell in _refPool) { uint count = Messaging.UInt32_objc_msgSend (cell.Handle, selRetainCount); if (count == 1) markedForDelete.Add (cell); } foreach (ImageAndTextCell cell in markedForDelete) { _refPool.Remove (cell); cell.Dispose (); } } // Method 5 static IntPtr selCopyWithZone = Selector.GetHandle("copyWithZone:"); [Export("copyWithZone:")] public virtual NSObject CopyWithZone(IntPtr zone) { IntPtr copyHandle = Messaging.IntPtr_objc_msgSendSuper_IntPtr(SuperHandle, selCopyWithZone, zone); ImageAndTextCell cell = new ImageAndTextCell(copyHandle) { Image = Image, }; _refPool.Add(cell); return cell; } Method 1: Increases the retain count of the unmanaged object. The unmanaged object will persist persist forever (I think? dealloc never called), and the managed object will be harvested early. Seems to be lose-lose all-around, but runs in practice. Method 2: Saves a reference of the managed object. The unmanaged object is left alone, and dealloc appears to be invoked at a reasonable time by the caller. At this point the managed object is released and disposed. This seems reasonable, but on the downside the base type's dealloc won't be run (I think?) Method 3: Increases the retain count and saves a reference. Unmanaged and managed objects leak forever. Method 4: Extends Method 3 by adding a cleanup function that is run periodically (e.g. during Init of each new ImageAndTextCell object). The cleanup function checks the retain counts of the stored objects. A retain count of 1 means the caller has released it, so we should as well. Should eliminate leaking in theory. Method 5: Attempt to invoke the copyWithZone method on the base type, and then construct a new ImageAndTextView object with the resulting handle. Seems to do the right thing (the base data is cloned). Internally, NSObject bumps the retain count on objects constructed like this, so we also use the PeriodicCleanup function to release these objects when they're no longer used. Based on the above, I believe Method 5 is the best approach since it should be the only one that results in a truly correct copy of the base type data, but I don't know if the approach is inherently dangerous (I am also making some assumptions about the underlying implementation of NSObject). So far nothing bad has happened "yet", but if anyone is able to vet my analysis then I would be more confident going forward.

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Why is .NET faster than C++ in this case?

- by acidzombie24

-edit- I LOVE SLaks comment. "The amount of misinformation in these answers is staggering." :D Calm down guys. Pretty much all of you were wrong. I DID make optimizations. It turns out whatever optimizations I made wasn't good enough. I ran the code in GCC using gettimeofday (I'll paste code below) and used g++ -O2 file.cpp and got slightly faster results then C#. Maybe MS didn't create the optimizations needed in this specific case but after downloading and installing mingw I was tested and found the speed to be near identical. Justicle Seems to be right. I could have sworn I use clock on my PC and used that to count and found it was slower but problem solved. C++ speed isn't almost twice as slower in the MS compiler. When my friend informed me of this I couldn't believe it. So I took his code and put some timers onto it. Instead of Boo I used C#. I constantly got faster results in C#. Why? The .NET version was nearly half the time no matter what number I used. C++ version: #include <iostream> #include <stdio.h> #include <intrin.h> #include <windows.h> using namespace std; int fib(int n) { if (n < 2) return n; return fib(n - 1) + fib(n - 2); } int main() { __int64 time = 0xFFFFFFFF; while (1) { int n; //cin >> n; n = 41; if (n < 0) break; __int64 start = __rdtsc(); int res = fib(n); __int64 end = __rdtsc(); cout << res << endl; cout << (float)(end-start)/1000000<<endl; break; } return 0; } C# version: using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Runtime.InteropServices; using System.ComponentModel; using System.Threading; using System.IO; using System.Diagnostics; namespace fibCSTest { class Program { static int fib(int n) { if (n < 2)return n; return fib(n - 1) + fib(n - 2); } static void Main(string[] args) { //var sw = new Stopwatch(); //var timer = new PAB.HiPerfTimer(); var timer = new Stopwatch(); while (true) { int n; //cin >> n; n = 41; if (n < 0) break; timer.Start(); int res = fib(n); timer.Stop(); Console.WriteLine(res); Console.WriteLine(timer.ElapsedMilliseconds); break; } } } } GCC version: #include <iostream> #include <stdio.h> #include <sys/time.h> using namespace std; int fib(int n) { if (n < 2) return n; return fib(n - 1) + fib(n - 2); } int main() { timeval start, end; while (1) { int n; //cin >> n; n = 41; if (n < 0) break; gettimeofday(&start, 0); int res = fib(n); gettimeofday(&end, 0); int sec = end.tv_sec - start.tv_sec; int usec = end.tv_usec - start.tv_usec; cout << res << endl; cout << sec << " " << usec <<endl; break; } return 0; }

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Is there a better way to avoid an infinite loop using winforms?

- by Hamish Grubijan

I am using .Net 3.5 for now. Right now I am using a using trick to disable and enable events around certain sections of code. The user can change either days, hours, minutes or total minutes, and that should not cause an infinite cascade of events (e.g. minutes changing total, total changing minutes, etc.) While the code does what I want, there might be a better / more straight-forward way. Do you know of any? For brawny points: This control will be used by multiple teams - I do not want to make it embarrassing. I suspect that I do not need to reinvent the wheel when defining hours in a day, days in week, etc. Some other standard .Net library out there must have it. Any other remarks regarding code? This using (EventHacker.DisableEvents(this)) business - that must be a common pattern in .Net ... changing the setting temporarily. What is the name of it? I'd like to be able to refer to it in a comment and also read up more on current implementations. In the general case not only a handle to the thing being changed needs to be remembered, but also the previous state (in this case previous state does not matter - events are turned on and off unconditionally). Then there is also a possibility of multi-threaded hacking. One could also utilize generics to make the code arguably cleaner. Figuring all this out can lead to a multi-page blog post. I'd be happy to hear some of the answers. P.S. Does it seem like I suffer from obsessive compulsive disorder? Some people like to get things finished and move on; I like to keep them open ... there is always a better way. // Corresponding Designer class is omitted. using System; using System.Windows.Forms; namespace XYZ // Real name masked { interface IEventHackable { void EnableEvents(); void DisableEvents(); } public partial class PollingIntervalGroupBox : GroupBox, IEventHackable { private const int DAYS_IN_WEEK = 7; private const int MINUTES_IN_HOUR = 60; private const int HOURS_IN_DAY = 24; private const int MINUTES_IN_DAY = MINUTES_IN_HOUR * HOURS_IN_DAY; private const int MAX_TOTAL_DAYS = 100; private static readonly decimal MIN_TOTAL_NUM_MINUTES = 1; // Anything faster than once per minute can bog down our servers. private static readonly decimal MAX_TOTAL_NUM_MINUTES = (MAX_TOTAL_DAYS * MINUTES_IN_DAY) - 1; // 99 days should be plenty. // The value above was chosen so to not cause an overflow exception. // Watch out for it - numericUpDownControls each have a MaximumValue setting. public PollingIntervalGroupBox() { InitializeComponent(); InitializeComponentCustom(); } private void InitializeComponentCustom() { this.m_upDownDays.Maximum = MAX_TOTAL_DAYS - 1; this.m_upDownHours.Maximum = HOURS_IN_DAY - 1; this.m_upDownMinutes.Maximum = MINUTES_IN_HOUR - 1; this.m_upDownTotalMinutes.Maximum = MAX_TOTAL_NUM_MINUTES; this.m_upDownTotalMinutes.Minimum = MIN_TOTAL_NUM_MINUTES; } private void m_upDownTotalMinutes_ValueChanged(object sender, EventArgs e) { setTotalMinutes(this.m_upDownTotalMinutes.Value); } private void m_upDownDays_ValueChanged(object sender, EventArgs e) { updateTotalMinutes(); } private void m_upDownHours_ValueChanged(object sender, EventArgs e) { updateTotalMinutes(); } private void m_upDownMinutes_ValueChanged(object sender, EventArgs e) { updateTotalMinutes(); } private void updateTotalMinutes() { this.setTotalMinutes( MINUTES_IN_DAY * m_upDownDays.Value + MINUTES_IN_HOUR * m_upDownHours.Value + m_upDownMinutes.Value); } public decimal TotalMinutes { get { return m_upDownTotalMinutes.Value; } set { m_upDownTotalMinutes.Value = value; } } public decimal TotalHours { set { setTotalMinutes(value * MINUTES_IN_HOUR); } } public decimal TotalDays { set { setTotalMinutes(value * MINUTES_IN_DAY); } } public decimal TotalWeeks { set { setTotalMinutes(value * DAYS_IN_WEEK * MINUTES_IN_DAY); } } private void setTotalMinutes(decimal nTotalMinutes) { if (nTotalMinutes < MIN_TOTAL_NUM_MINUTES) { setTotalMinutes(MIN_TOTAL_NUM_MINUTES); return; // Must be carefull with recursion. } if (nTotalMinutes > MAX_TOTAL_NUM_MINUTES) { setTotalMinutes(MAX_TOTAL_NUM_MINUTES); return; // Must be carefull with recursion. } using (EventHacker.DisableEvents(this)) { // First set the total minutes this.m_upDownTotalMinutes.Value = nTotalMinutes; // Then set the rest this.m_upDownDays.Value = (int)(nTotalMinutes / MINUTES_IN_DAY); nTotalMinutes = nTotalMinutes % MINUTES_IN_DAY; // variable reuse. this.m_upDownHours.Value = (int)(nTotalMinutes / MINUTES_IN_HOUR); nTotalMinutes = nTotalMinutes % MINUTES_IN_HOUR; this.m_upDownMinutes.Value = nTotalMinutes; } } // Event magic public void EnableEvents() { this.m_upDownTotalMinutes.ValueChanged += this.m_upDownTotalMinutes_ValueChanged; this.m_upDownDays.ValueChanged += this.m_upDownDays_ValueChanged; this.m_upDownHours.ValueChanged += this.m_upDownHours_ValueChanged; this.m_upDownMinutes.ValueChanged += this.m_upDownMinutes_ValueChanged; } public void DisableEvents() { this.m_upDownTotalMinutes.ValueChanged -= this.m_upDownTotalMinutes_ValueChanged; this.m_upDownDays.ValueChanged -= this.m_upDownDays_ValueChanged; this.m_upDownHours.ValueChanged -= this.m_upDownHours_ValueChanged; this.m_upDownMinutes.ValueChanged -= this.m_upDownMinutes_ValueChanged; } // We give as little info as possible to the 'hacker'. private sealed class EventHacker : IDisposable { IEventHackable _hackableHandle; public static IDisposable DisableEvents(IEventHackable hackableHandle) { return new EventHacker(hackableHandle); } public EventHacker(IEventHackable hackableHandle) { this._hackableHandle = hackableHandle; this._hackableHandle.DisableEvents(); } public void Dispose() { this._hackableHandle.EnableEvents(); } } } }

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C++0x rvalue references - lvalues-rvalue binding

- by Doug

This is a follow-on question to http://stackoverflow.com/questions/2748866/c0x-rvalue-references-and-temporaries In the previous question, I asked how this code should work: void f(const std::string &); //less efficient void f(std::string &&); //more efficient void g(const char * arg) { f(arg); } It seems that the move overload should probably be called because of the implicit temporary, and this happens in GCC but not MSVC (or the EDG front-end used in MSVC's Intellisense). What about this code? void f(std::string &&); //NB: No const string & overload supplied void g1(const char * arg) { f(arg); } void g2(const std::string & arg) { f(arg); } It seems that, based on the answers to my previous question that function g1 is legal (and is accepted by GCC 4.3-4.5, but not by MSVC). However, GCC and MSVC both reject g2 because of clause 13.3.3.1.4/3, which prohibits lvalues from binding to rvalue ref arguments. I understand the rationale behind this - it is explained in N2831 "Fixing a safety problem with rvalue references". I also think that GCC is probably implementing this clause as intended by the authors of that paper, because the original patch to GCC was written by one of the authors (Doug Gregor). However, I don't this is quite intuitive. To me, (a) a const string & is conceptually closer to a string && than a const char *, and (b) the compiler could create a temporary string in g2, as if it were written like this: void g2(const std::string & arg) { f(std::string(arg)); } Indeed, sometimes the copy constructor is considered to be an implicit conversion operator. Syntactically, this is suggested by the form of a copy constructor, and the standard even mentions this specifically in clause 13.3.3.1.2/4, where the copy constructor for derived-base conversions is given a higher conversion rank than other implicit conversions: A conversion of an expression of class type to the same class type is given Exact Match rank, and a conversion of an expression of class type to a base class of that type is given Conversion rank, in spite of the fact that a copy/move constructor (i.e., a user-defined conversion function) is called for those cases. (I assume this is used when passing a derived class to a function like void h(Base), which takes a base class by value.) Motivation My motivation for asking this is something like the question asked in http://stackoverflow.com/questions/2696156/how-to-reduce-redundant-code-when-adding-new-c0x-rvalue-reference-operator-over ("How to reduce redundant code when adding new c++0x rvalue reference operator overloads"). If you have a function that accepts a number of potentially-moveable arguments, and would move them if it can (e.g. a factory function/constructor: Object create_object(string, vector<string>, string) or the like), and want to move or copy each argument as appropriate, you quickly start writing a lot of code. If the argument types are movable, then one could just write one version that accepts the arguments by value, as above. But if the arguments are (legacy) non-movable-but-swappable classes a la C++03, and you can't change them, then writing rvalue reference overloads is more efficient. So if lvalues did bind to rvalues via an implicit copy, then you could write just one overload like create_object(legacy_string &&, legacy_vector<legacy_string> &&, legacy_string &&) and it would more or less work like providing all the combinations of rvalue/lvalue reference overloads - actual arguments that were lvalues would get copied and then bound to the arguments, actual arguments that were rvalues would get directly bound. Questions My questions are then: Is this a valid interpretation of the standard? It seems that it's not the conventional or intended one, at any rate. Does it make intuitive sense? Is there a problem with this idea that I"m not seeing? It seems like you could get copies being quietly created when that's not exactly expected, but that's the status quo in places in C++03 anyway. Also, it would make some overloads viable when they're currently not, but I don't see it being a problem in practice. Is this a significant enough improvement that it would be worth making e.g. an experimental patch for GCC?

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c++ and c# speed compared

- by Mack

I was worried about C#'s speed when it deals with heavy calculations, when you need to use raw CPU power. I always thought that C++ is much faster than C# when it comes to calculations. So I did some quick tests. The first test computes prime numbers < an integer n, the second test computes some pandigital numbers. The idea for second test comes from here: Pandigital Numbers C# prime computation: using System; using System.Diagnostics; class Program { static int primes(int n) { uint i, j; int countprimes = 0; for (i = 1; i <= n; i++) { bool isprime = true; for (j = 2; j <= Math.Sqrt(i); j++) if ((i % j) == 0) { isprime = false; break; } if (isprime) countprimes++; } return countprimes; } static void Main(string[] args) { int n = int.Parse(Console.ReadLine()); Stopwatch sw = new Stopwatch(); sw.Start(); int res = primes(n); sw.Stop(); Console.WriteLine("I found {0} prime numbers between 0 and {1} in {2} msecs.", res, n, sw.ElapsedMilliseconds); Console.ReadKey(); } } C++ variant: #include <iostream> #include <ctime> int primes(unsigned long n) { unsigned long i, j; int countprimes = 0; for(i = 1; i <= n; i++) { int isprime = 1; for(j = 2; j < (i^(1/2)); j++) if(!(i%j)) { isprime = 0; break; } countprimes+= isprime; } return countprimes; } int main() { int n, res; cin>>n; unsigned int start = clock(); res = primes(n); int tprime = clock() - start; cout<<"\nI found "<<res<<" prime numbers between 1 and "<<n<<" in "<<tprime<<" msecs."; return 0; } When I ran the test trying to find primes < than 100,000, C# variant finished in 0.409 seconds and C++ variant in 5.553 seconds. When I ran them for 1,000,000 C# finished in 6.039 seconds and C++ in about 337 seconds. Pandigital test in C#: using System; using System.Diagnostics; class Program { static bool IsPandigital(int n) { int digits = 0; int count = 0; int tmp; for (; n > 0; n /= 10, ++count) { if ((tmp = digits) == (digits |= 1 << (n - ((n / 10) * 10) - 1))) return false; } return digits == (1 << count) - 1; } static void Main() { int pans = 0; Stopwatch sw = new Stopwatch(); sw.Start(); for (int i = 1; i <= 123456789; i++) { if (IsPandigital(i)) { pans++; } } sw.Stop(); Console.WriteLine("{0}pcs, {1}ms", pans, sw.ElapsedMilliseconds); Console.ReadKey(); } } Pandigital test in C++: #include <iostream> #include <ctime> using namespace std; int IsPandigital(int n) { int digits = 0; int count = 0; int tmp; for (; n > 0; n /= 10, ++count) { if ((tmp = digits) == (digits |= 1 << (n - ((n / 10) * 10) - 1))) return 0; } return digits == (1 << count) - 1; } int main() { int pans = 0; unsigned int start = clock(); for (int i = 1; i <= 123456789; i++) { if (IsPandigital(i)) { pans++; } } int ptime = clock() - start; cout<<"\nPans:"<<pans<<" time:"<<ptime; return 0; } C# variant runs in 29.906 seconds and C++ in about 36.298 seconds. I didn't touch any compiler switches and bot C# and C++ programs were compiled with debug options. Before I attempted to run the test I was worried that C# will lag well behind C++, but now it seems that there is a pretty big speed difference in C# favor. Can anybody explain this? C# is jitted and C++ is compiled native so it's normal that a C++ will be faster than a C# variant. Thanks for the answers!

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PHP: How to automate building a 100 <UL>/<LI> menuitems, while keeping the Menu Structure File Flat / Simply Managable?

- by Sam

Above: current "stupid" menu. (entire ul/li menu for javascript menu system) + (some li lines as page-specific submenu) Hi folks! With passion for automation and elegancy, but limited knowledge/knowhow, im stuck with "my hands in my hair" as we Dutch say, for my current menu system works perfectly, but is a pain in the a*s to update! So, i would appreciate it greatly, if you can suggest how to automate this in php: how to let the php generate the html menu code basing on a flat menu input file with TABS indented. OLD SITUATION <ul>  <li><a href="carrot.php"><p class="mnu" style="background-position:0 -820px"><? echo __("carrot juice") ?></p></a></li>  </ul a javascript file reads a ul/li structure as input to build menu of format in that ul/li, the items with a hyperlink and sprite-bg position represent webpages, (inside LI) while items without hyperlink and sprite-bg are just headers of that menusection, (inside H6) to highlight the current page in the menu, the javascript menumaker uses an id number. this number corresponds to the consequtive li that is a webpage, skips h6 headers correctly. these h6 headers are only there for when importing sections of the same menu as submenu. non-li headers are not shown in menu, nore counted by the javascript menu for their ID. to know which page should be shown, i have to count from ID 0, the li items till finding the current webpage in the li structure and then manually put it in each webpage! BUT: changing an item in li order, means stupidly re-counting their entire li again! each webpage has an icon (= sprite bg-position numer), which is also used in the webpage. INTENDED RESULT I dream of, once setting what the current webpage is (e.g carrot.php) the menu system automatically "finds" and "counts" the li's and returns the id nr (for proper highlight of main menu); generates the entire menu html, and depending on which headings are set for submenu, (e.g. meals, drinks) generates those submenu (entire section below each given header); ginally adds h5 highlight inside the li of that submenu item. For the menu, i wish an easily readable, simple plain txt menu that is indented with tabs, (each tab is one depth for example) and further tabs follow for url and sprite position of icon. MY DREAM MENU-MANAGEMENT FILE |>TAB SEPARATED/INDENTED FLATMENU FILE |MUST BE CALCULATED BY PHP: |>MENUTEXT============URL=============SPRITE=====|ID===TAG================== |>about "#" -520 |00 li |> INFORMATION |—— h6 |> physical state "physical.php" -920 |01 li |> mental health "mental.php" -10 |02 li |> |>apetite "#" -1290 |03 li |> meals "#" -600 |04 li |> COLD MEAL |—— h6 |> egg salade "salad.php" -1040 |05 li |> salmon fish "salmon.php" -540 |06 li |> HOT MEAL |—— h6 |> spare ribs "spareribs.php" -120 |07 li |> di macaroni "macaroni.php" -870 |08 li |> |> drinks "#" -230 |09 li |> JUCY DRINK |—— h6 |> carrot juice "carrot.php" -820 |10 li |> mango hive "mango.php" -270 |11 li DESIRED CHRONOLOGY php outputs the entire ul/li html so the javascript can show the menu: webpage items go inside li tags, and header items go inside h6 tags, e.g. <h6>JUCY DRINK</h6> Each website page has a url filename [eg: salad.php]. Based on this given fact, the php menu generator detects the pagename, gives the IDnr of the position of that page according to the li-item nr and sets variable for javascript to highlight current menu item. the menu items below the specified headers are loaded as submenu in which the current page.php is wrapped inside h5 to highlight current page in submenu: e.g. (<li><h5><a href="carrot.php"><p>..etc..</p></h5></li> Question Which methods / steps / (chronological)ways are there for doing this? I am no good in php programming, but am learning it so please dont write any code without a line of comment why I should use that method etc. Where do I start? If I am unclear in my question, please ask. Thanks. Much appreciated!! Concrete Task List from the provided Comments/Answers, sofar: (RobertB) First, get some PHP code working that can read through a tab-delimited file and put the data into an appropriate data structure. NOW WORKING AT THIS

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Replacing objects, handling clones, dealing with write logs

- by Alix

Hi everyone, I'm dealing with a problem I can't figure out how to solve, and I'd love to hear some suggestions. [NOTE: I realise I'm asking several questions; however, answers need to take into account all of the issues, so I cannot split this into several questions] Here's the deal: I'm implementing a system that underlies user applications and that protect shared objects from concurrent accesses. The application programmer (whose application will run on top of my system) defines such shared objects like this: public class MyAtomicObject { // These are just examples of fields you may want to have in your class. public virtual int x { get; set; } public virtual List<int> list { get; set; } public virtual MyClassA objA { get; set; } public virtual MyClassB objB { get; set; } } As you can see they declare the fields of their class as auto-generated properties (auto-generated means they don't need to implement get and set). This is so that I can go in and extend their class and implement each get and set myself in order to handle possible concurrent accesses, etc. This is all well and good, but now it starts to get ugly: the application threads run transactions, like this: The thread signals it's starting a transaction. This means we now need to monitor its accesses to the fields of the atomic objects. The thread runs its code, possibly accessing fields for reading or writing. If there are accesses for writing, we'll hide them from the other transactions (other threads), and only make them visible in step 3. This is because the transaction may fail and have to roll back (undo) its updates, and in that case we don't want other threads to see its "dirty" data. The thread signals it wants to commit the transaction. If the commit is successful, the updates it made will now become visible to everyone else. Otherwise, the transaction will abort, the updates will remain invisible, and no one will ever know the transaction was there. So basically the concept of transaction is a series of accesses that appear to have happened atomically, that is, all at the same time, in the same instant, which would be the moment of successful commit. (This is as opposed to its updates becoming visible as it makes them) In order to hide the write accesses in step 2, I clone the accessed field (let's say it's the field list) and put it in the transaction's write log. After that, any time the transaction accesses list, it will actually be accessing the clone in its write log, and not the global copy everyone else sees. Like this, any changes it makes will be done to the (invisible) clone, not to the global copy. If in step 3 the commit is successful, the transaction should replace the global copy with the updated list it has in its write log, and then the changes become visible for everyone else at once. It would be something like this: myAtomicObject.list = updatedCloneOfListInTheWriteLog; Problem #1: possible references to the list. Let's say someone puts a reference to the global list in a dictionary. When I do... myAtomicObject.list = updatedCloneOfListInTheWriteLog; ...I'm just replacing the reference in the field list, but not the real object (I'm not overwriting the data), so in the dictionary we'll still have a reference to the old version of the list. A possible solution would be to overwrite the data (in the case of a list, empty the global list and add all the elements of the clone). More generically, I would need to copy the fields of one list to the other. I can do this with reflection, but that's not very pretty. Is there any other way to do it? Problem #2: even if problem #1 is solved, I still have a similar problem with the clone: the application programmer doesn't know I'm giving him a clone and not the global copy. What if he puts the clone in a dictionary? Then at commit there will be some references to the global copy and some to the clone, when in truth they should all point to the same object. I thought about providing a wrapper object that contains both the cloned list and a pointer to the global copy, but the programmer doesn't know about this wrapper, so they're not going to use the pointer at all. The wrapper would be like this: public class Wrapper<T> : T { // This would be the pointer to the global copy. The local data is contained in whatever fields the wrapper inherits from T. private T thisPtr; } I do need this wrapper for comparisons: if I have a dictionary that has an entry with the global copy as key, if I look it up with the clone, like this: dictionary[updatedCloneOfListInTheWriteLog] I need it to return the entry, that is, to think that updatedCloneOfListInTheWriteLog and the global copy are the same thing. For this, I can just override Equals, GetHashCode, operator== and operator!=, no problem. However I still don't know how to solve the case in which the programmer unknowingly inserts a reference to the clone in a dictionary. Problem #3: the wrapper must extend the class of the object it wraps (if it's wrapping MyClassA, it must extend MyClassA) so that it's accepted wherever an object of that class (MyClass) would be accepted. However, that class (MyClassA) may be final. This is pretty horrible :$. Any suggestions? I don't need to use a wrapper, anything you can think of is fine. What I cannot change is the write log (I need to have a write log) and the fact that the programmer doesn't know about the clone. I hope I've made some sense. Feel free to ask for more info if something needs some clearing up. Thanks so much!

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asp.net how to add TemplateField programmatically for about 10 dropdownlist...

- by dotnet-practitioner

This is my third time asking this question. I am not getting good answers regarding this. I wish I could get some help but I will keep asking this question because its a good question and SO experts should not ignore this... So I have about 10 dropdownlist controls that I add manually in the DetailsView control manually like follows. I should be able to add this programmatically. Please help and do not ignore... <asp:DetailsView ID="dvProfile" runat="server" AutoGenerateRows="False" DataKeyNames="memberid" DataSourceID="SqlDataSource1" OnPreRender = "_onprerender" Height="50px" onm="" Width="125px"> <Fields> <asp:TemplateField HeaderText="Your Gender"> <EditItemTemplate> <asp:DropDownList ID="ddlGender" runat="server" DataSourceid="ddlDAGender" DataTextField="Gender" DataValueField="GenderID" SelectedValue='<%#Bind("GenderID") %>' > </asp:DropDownList> </EditItemTemplate> <ItemTemplate > <asp:Label Runat="server" Text='<%# Bind("Gender") %>' ID="lblGender"></asp:Label> </ItemTemplate> so on and so forth... <asp:CommandField ShowEditButton="True" ShowInsertButton="True" /> </Fields> </asp:DetailsView> ======================================================= Added on 5/3/09 This is what I have so far and I still can not add the drop down list programmatically. private void PopulateItemTemplate(string luControl) { SqlDataSource ds = new SqlDataSource(); ds = (SqlDataSource)FindControl("ddlDAGender"); DataView dvw = new DataView(); DataSourceSelectArguments args = new DataSourceSelectArguments(); dvw = (DataView)ds.Select(args); DataTable dt = dvw.ToTable(); DetailsView dv = (DetailsView)LoginView2.FindControl("dvProfile"); TemplateField tf = new TemplateField(); tf.HeaderText = "Your Gender"; tf.ItemTemplate = new ProfileItemTemplate("Gender", ListItemType.Item); tf.EditItemTemplate = new ProfileItemTemplate("Gender", ListItemType.EditItem); dv.Fields.Add(tf); } public class ProfileItemTemplate : ITemplate { private string ctlName; ListItemType _lit; private string _strDDLName; private string _strDVField; private string _strDTField; private string _strSelectedID; private DataTable _dt; public ProfileItemTemplate(string strDDLName, string strDVField, string strDTField, DataTable dt ) { _dt = dt; _strDDLName = strDDLName; _strDVField = strDVField; _strDTField = strDTField; } public ProfileItemTemplate(string strDDLName, string strDVField, string strDTField, string strSelectedID, DataTable dt ) { _dt = dt; _strDDLName = strDDLName; _strDVField = strDVField; _strDTField = strDTField; _strSelectedID = strSelectedID; } public ProfileItemTemplate(string ControlName, ListItemType lit) { ctlName = ControlName; _lit = lit; } public void InstantiateIn(Control container) { switch(_lit) { case ListItemType.Item : Label lbl = new Label(); lbl.DataBinding += new EventHandler(this.ddl_DataBinding_item); container.Controls.Add(lbl); break; case ListItemType.EditItem : DropDownList ddl = new DropDownList(); ddl.DataBinding += new EventHandler(this.lbl_DataBinding); container.Controls.Add(ddl); break; } } private void ddl_DataBinding_item(object sender, EventArgs e) { DropDownList ddl = (DropDownList)sender; ddl.ID = _strDDLName; ddl.DataSource = _dt; ddl.DataValueField = _strDVField; ddl.DataTextField = _strDVField; } private void lbl_DataBinding(object sender, EventArgs e) { Label lbl = (Label)sender; lbl.ID = "lblGender"; DropDownList ddl = (DropDownList)sender; ddl.ID = _strDDLName; ddl.DataSource = _dt; ddl.DataValueField = _strDVField; ddl.DataTextField = _strDTField; for (int i = 0; i < _dt.Rows.Count; i++) { if (_strSelectedID == _dt.Rows[i][_strDVField].ToString()) { ddl.SelectedIndex = i; } } lbl.Text = ddl.SelectedValue; } } Please help me....

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Error showing is NullPointerException [duplicate]

- by user3659612

This question already has an answer here: How to check a string against null in java? 11 answers I was trying to code a wifi scanner which does 20 scans but it shows NullPointerException at if(bssid[j].equals(null)){ My code is slightly huge package com.example.scanner; import java.io.File; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.OutputStreamWriter; import java.text.SimpleDateFormat; import java.util.Date; import java.util.List; import android.annotation.SuppressLint; import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.content.IntentFilter; import android.net.wifi.ScanResult; import android.net.wifi.WifiInfo; import android.net.wifi.WifiManager; import android.os.Bundle; import android.os.Environment; import android.support.v7.app.ActionBarActivity; import android.view.Menu; import android.view.View; import android.widget.ArrayAdapter; import android.widget.Button; import android.widget.ListView; import android.widget.Toast; public class MainActivity extends ActionBarActivity { WifiManager wifi; WifiScanReceiver wifireciever; WifiInfo info; Button scan, save; List<ScanResult> wifilist; ListView list; String wifis[]; String name; String[] ssid = new String[100]; String[] bssid = new String[100]; int[] lvl = new int[100]; int[] count = new int[100]; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.fragment_main); list=(ListView)findViewById(R.id.listView1); scan=(Button)findViewById(R.id.button1); save=(Button)findViewById(R.id.button2); scan.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub wifi=(WifiManager)getSystemService(Context.WIFI_SERVICE); if (wifi.isWifiEnabled()==false){ wifi.setWifiEnabled(true); } wifireciever = new WifiScanReceiver(); for (int i=0;i<20;i++){ registerReceiver(wifireciever, new IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION)); wifi.startScan(); if (i==19){ Toast.makeText(getBaseContext(), "Scan Finish", Toast.LENGTH_LONG).show(); } } } }); save.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub savedata(); } }); } protected void savedata() { // TODO Auto-generated method stub try { File sdcard = Environment.getExternalStorageDirectory(); File directory = new File(sdcard.getAbsolutePath() + "/WIFI_RESULT"); directory.mkdirs(); name = new SimpleDateFormat("yyyy-MM-dd HH mm ss").format(new Date()); File file = new File(directory,name + "wifi_data.txt"); FileOutputStream fou = new FileOutputStream(file); OutputStreamWriter osw = new OutputStreamWriter(fou); try { for (int i =0; i < list.getCount(); i++){ osw.append(list.getItemAtPosition(i).toString()); } osw.flush(); osw.close(); Toast.makeText(getBaseContext(), "Saved", Toast.LENGTH_LONG).show(); } catch (IOException e){ e.printStackTrace(); } } catch (FileNotFoundException e){ e.printStackTrace(); } } class WifiScanReceiver extends BroadcastReceiver { @SuppressLint("UseValueOf") public void onReceive(Context c, Intent intent) { int a =0; wifi.startScan(); List<ScanResult> wifilist = wifi.getScanResults(); if (a<wifilist.size()){ a=wifilist.size(); } for(int j=0;j<wifilist.size();j++){ if(bssid[j].equals(null)){ ssid[j] = wifilist.get(j).SSID.toString(); bssid[j] = wifilist.get(j).BSSID.toString(); lvl[j] = wifilist.get(j).level; count[j]++; } else if (bssid[j].equals(wifilist.get(j).BSSID.toString())){ lvl[j] = lvl[j] + wifilist.get(j).level; count[j]++; } } wifis = new String[a]; for (int i =0; i<a; i++){ wifis[i] = ("\n" + ssid[i] + "\n AP Address" + bssid[i] + "\n Signal Strength:" + lvl[i]/count[i]).toString(); } list.setAdapter(new ArrayAdapter<String>(getApplicationContext(), android.R.layout.simple_list_item_1,wifis)); } } protected void onDestroy() { unregisterReceiver(wifireciever); super.onPause(); } protected void onResume() { registerReceiver(wifireciever, new IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION)); super.onResume(); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); return true; } } NullPointerException at that point mean my array bssid isn't initialize. So I just want to know how to initialize it in main activity so that I can use that string bssid anywhere.

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C++: Simplifying my program to convert numbers to from one base to another.

- by Spin City

Hello, I'm taking a beginner C++ course. I received an assignment telling me to write a program that converts an arbitrary number from any base between binary and hex to another base between binary and hex. I was asked to use separate functions to convert to and from base 10. It was to help us get used to using arrays. (We already covered passing by reference previously in class.) I already turned this in, but I'm pretty sure this wasn't how I was meant to do it: #include <iostream> #include <conio.h> #include <cstring> #include <cmath> using std::cout; using std::cin; using std::endl; int to_dec(char value[], int starting_base); char* from_dec(int value, int ending_base); int main() { char value[30]; int starting_base; int ending_base; cout << "This program converts from one base to another, so long as the bases are" << endl << "between 2 and 16." << endl << endl; input_numbers: cout << "Enter the number, then starting base, then ending base:" << endl; cin >> value >> starting_base >> ending_base; if (starting_base < 2 || starting_base > 16 || ending_base < 2 || ending_base > 16) { cout << "Invalid base(s). "; goto input_numbers; } for (int i=0; value[i]; i++) value[i] = toupper(value[i]); cout << "Base " << ending_base << ": " << from_dec(to_dec(value, starting_base), ending_base) << endl << "Press any key to exit."; getch(); return 0; } int to_dec(char value[], int starting_base) { char hex[16] = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'}; long int return_value = 0; unsigned short int digit = 0; for (short int pos = strlen(value)-1; pos > -1; pos--) { for (int i=0; i<starting_base; i++) { if (hex[i] == value[pos]) { return_value+=i*pow((float)starting_base, digit++); break; } } } return return_value; } char* from_dec(int value, int ending_base) { char hex[16] = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'}; char *return_value = (char *)malloc(30); unsigned short int digit = (int)ceil(log10((double)(value+1))/log10((double)ending_base)); return_value[digit] = 0; for (; value != 0; value/=ending_base) return_value[--digit] = hex[value%ending_base]; return return_value; } I'm pretty sure this is more advanced than it was meant to be. How do you think I was supposed to do it? I'm essentially looking for two kinds of answers: Examples of what a simple solution like the one my teacher probably expected would be. Suggestions on how to improve the code.

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Hover image - part of forms appears untill hover another How?

- by Mac

Im trying to make part of my form/questionnaire appears when hover on image and stay active untill hover another image next to it. and repeat it on 7 images. Of course I need the cheched checkboxes to stay after they'll be hidden so you can come back to them by hover the image and for ex. correct answers and so on.. I was using a j code: <script type="text/javascript"> $("#Oobj51").hover(function(){ $('#Oobj58').show(); },function(){ $('#Oobj58').hide(); }); </script> it works to another elements on my page but not to the form. how can i do it maybe with css class or another j code. Thanks! Parts of html: (let's say I want to hover on "Oobj56" and make "Oobj58" appears and stay as I said before...) <div id="Oobj56"> <button type="submit" class="przed6" onmouseover="this.className='po6'" onmouseout="this.className='przed6'" /> </div> <div id="Oobj57"> <button type="submit" class="przed7" onmouseover="this.className='po7'" onmouseout="this.className='przed7'" /> </div> <div id="Oobj60"> <form action="mailto:" method="post" enctype="text/plain"> <div id="Oobj59"> <input type="text" input size="8" name="imie" placeholder="imie"> <input type="text" input size="11" name="numer" placeholder="numer telefonu"> <br><br> <select name="miasto"> <option selected="Miasto">Miasto</option> <option>Wroclaw</option> <option>Warszawa</option> <option>Kraków</option> <option>Trójmiasto</option> <option>Poznan</option> <option>Szczecin</option> <option>Torun</option> <option>Lódz</option> <option>Bydgoszcz</option> <option>Lublin</option> <option>Katowice</option> </select> <select name="wiek"> <option selected="selected">Wiek</option> <option> <15 </option> <option>15-19</option> <option>20-24</option> <option>25-29</option> <option>30-34</option> <option>35-39</option> <option>40-44</option> <option>45-49</option> <option>50-54</option> <option>55-59</option> <option>60-64</option> <option>65-69</option> <option>70-74</option> <option> >75 </option> </select> <select name="plec"> <option selected="selected">Plec</option> <option>Mezczyzna</option> <option>Kobieta</option> </select></div> <div id="Oobj58"> <script language="JavaScript"> function toggle(source) { checkboxes = document.getElementsByName('sport'); for(var i=0, n=checkboxes.length;i<n;i++) { checkboxes[i].checked = source.checked; } } </script> <input type="checkbox" onClick="toggle(this)" /><br> <input type="checkbox" name="sport" value="gym" />silownia<br /> <input type="checkbox" name="sport" value="fitness" />fitness<br /> <input type="checkbox" name="sport" value="noga" />pilka nozna<br /> <input type="checkbox" name="sport" value="kosz" />koszykówka<br /> <input type="checkbox" name="sport" value="siata" />siatkówka<br /> <input type="checkbox" name="sport" value="ameryka" />football amerykanski<br /> <input type="checkbox" name="sport" value="konie" />jezdziectwo konne<br /> <input type="checkbox" name="sport" value="basen" />basen/sporty wodne<br /> <input type="checkbox" name="sport" value="zima" />sporty zimowe<br /> </div> <div id="Oobj15"> <input type="submit" style="font-family: Open Sans;" value="Wyslij" class="wyslij" /> </div></form> </div>

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IE 8 Automatically Closing <header> tag

- by djthoms

Background I am currently working on the final QA of a responsive website and I'm having an issue with IE 8 and IE 7. My client deals with government contracting so their website needs to be compatible with IE 8 and IE 7. I am using Modernizr with html5shiv built in. I am loading Modernizr in the footer of a WordPress theme that was custom built for this project. I'm not missing a doctype or any other obvious code. I am using the following scripts, all of which are loaded in the footer of WordPress: jQuery 1.10.1 Modernizr 2.6.3 (click for config) respond.js 1.3.0 superfish jQuery Waypoints 2.0.3 jQuery Waypoints Sticky 2.0.3 The Situation I'm having an issue with IE 8 automatically closing a <header> tag. First, I have used two utilities to check this issue: IETester IE 11 emulated to IE 8 w/ IE 8 User agent Here is the correct output <div class="wrapper main-header"> <header class="container"> <div class="sixteen columns alpha omega"> <div class="eight columns alpha omega logo"> <a href="http://example.com"><img src="http://example.com/wp-content/uploads/2013/10/logo.png" alt="Example"></a> </div> <div class="wrapper main-navigation desktop"> <nav id="nav" class="six columns alpha omega"> ... </nav> <div class="eight columns alpha omega overlay" style="display: none;"> ... </div> <div class="two columns alpha omega menu-ss"> ... </div> </div> </div> </header> </div> What IE 8 is rendering: <div class="wrapper main-header"> <header class="container"></header> <div class="sixteen columns alpha omega"> <div class="eight columns alpha omega logo"> <a href="http://example.com"><img src="http://example.com/wp-content/uploads/2013/10/logo.png" alt="Example"></a> </div> <div class="wrapper main-navigation desktop"> <nav id="nav" class="six columns alpha omega"> ... </nav> <div class="eight columns alpha omega overlay" style="display: none;"> ... </div> <div class="two columns alpha omega menu-ss"> ... </div> </div> </div> </header><//header> </div> What I have Tried Loading html5shiv with IE conditional in the <head> Loading Modernizr in the <head> I have looked at these Stackoverflow questions/answers: html 5 tags foorter or header in ie 8 and ie 7 html5 not rendering header tags in ie IE 8 self closing tags automatically Any assistance with this is greatly appreciated! I would really really really like to finish this website over the weekend. I've been banging my head against a wall for the past few hours over this issue. Update Here are some images from browsershack to cut out the emulation. I tested the site virtually with Windows 7 and WIndows XP (IE 8 & IE 7). http://www.browserstack.com/screenshots/0d7c1d6dd22927c20495e67f07afe8934957b4d1

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Adapting non-iterable containers to be iterated via custom templatized iterator

- by DAldridge

I have some classes, which for various reasons out of scope of this discussion, I cannot modify (irrelevant implementation details omitted): class Foo { /* ... irrelevant public interface ... */ }; class Bar { public: Foo& get_foo(size_t index) { /* whatever */ } size_t size_foo() { /* whatever */ } }; (There are many similar 'Foo' and 'Bar' classes I'm dealing with, and it's all generated code from elsewhere and stuff I don't want to subclass, etc.) [Edit: clarification - although there are many similar 'Foo' and 'Bar' classes, it is guaranteed that each "outer" class will have the getter and size methods. Only the getter method name and return type will differ for each "outer", based on whatever it's "inner" contained type is. So, if I have Baz which contains Quux instances, there will be Quux& Baz::get_quux(size_t index), and size_t Baz::size_quux().] Given the design of the Bar class, you cannot easily use it in STL algorithms (e.g. for_each, find_if, etc.), and must do imperative loops rather than taking a functional approach (reasons why I prefer the latter is also out of scope for this discussion): Bar b; size_t numFoo = b.size_foo(); for (int fooIdx = 0; fooIdx < numFoo; ++fooIdx) { Foo& f = b.get_foo(fooIdx); /* ... do stuff with 'f' ... */ } So... I've never created a custom iterator, and after reading various questions/answers on S.O. about iterator_traits and the like, I came up with this (currently half-baked) "solution": First, the custom iterator mechanism (NOTE: all uses of 'function' and 'bind' are from std::tr1 in MSVC9): // Iterator mechanism... template <typename TOuter, typename TInner> class ContainerIterator : public std::iterator<std::input_iterator_tag, TInner> { public: typedef function<TInner& (size_t)> func_type; ContainerIterator(const ContainerIterator& other) : mFunc(other.mFunc), mIndex(other.mIndex) {} ContainerIterator& operator++() { ++mIndex; return *this; } bool operator==(const ContainerIterator& other) { return ((mFunc.target<TOuter>() == other.mFunc.target<TOuter>()) && (mIndex == other.mIndex)); } bool operator!=(const ContainerIterator& other) { return !(*this == other); } TInner& operator*() { return mFunc(mIndex); } private: template<typename TOuter, typename TInner> friend class ContainerProxy; ContainerIterator(func_type func, size_t index = 0) : mFunc(func), mIndex(index) {} function<TInner& (size_t)> mFunc; size_t mIndex; }; Next, the mechanism by which I get valid iterators representing begin and end of the inner container: // Proxy(?) to the outer class instance, providing a way to get begin() and end() // iterators to the inner contained instances... template <typename TOuter, typename TInner> class ContainerProxy { public: typedef function<TInner& (size_t)> access_func_type; typedef function<size_t ()> size_func_type; typedef ContainerIterator<TOuter, TInner> iter_type; ContainerProxy(access_func_type accessFunc, size_func_type sizeFunc) : mAccessFunc(accessFunc), mSizeFunc(sizeFunc) {} iter_type begin() const { size_t numItems = mSizeFunc(); if (0 == numItems) return end(); else return ContainerIterator<TOuter, TInner>(mAccessFunc, 0); } iter_type end() const { size_t numItems = mSizeFunc(); return ContainerIterator<TOuter, TInner>(mAccessFunc, numItems); } private: access_func_type mAccessFunc; size_func_type mSizeFunc; }; I can use these classes in the following manner: // Sample function object for taking action on an LMX inner class instance yielded // by iteration... template <typename TInner> class SomeTInnerFunctor { public: void operator()(const TInner& inner) { /* ... whatever ... */ } }; // Example of iterating over an outer class instance's inner container... Bar b; /* assume populated which contained items ... */ ContainerProxy<Bar, Foo> bProxy( bind(&Bar::get_foo, b, _1), bind(&Bar::size_foo, b)); for_each(bProxy.begin(), bProxy.end(), SomeTInnerFunctor<Foo>()); Empirically, this solution functions correctly (minus any copy/paste or typos I may have introduced when editing the above for brevity). So, finally, the actual question: I don't like requiring the use of bind() and _1 placeholders, etcetera by the caller. All they really care about is: outer type, inner type, outer type's method to fetch inner instances, outer type's method to fetch count inner instances. Is there any way to "hide" the bind in the body of the template classes somehow? I've been unable to find a way to separately supply template parameters for the types and inner methods separately... Thanks! David

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seeking help with Chrome & Safari not rendering my table stretched to fit its contents...help?

- by oompa_l

I have an element on this web page I'm developing where I need my text to conform to the width of an image above it - whose width will always be different - think of captions. I have found numerous references to using a 1px table to force this width sizing behaviour. I am having problems, though with Safari and Chrome "seeing" this instruction - the text ends up as a marginally sized text box sitting behind the image. The problem, as I see it, has to do with the text and images sitting in div's nested within the table. I need the images to sit in a div because of some jquery script I'm using called cycle, which turns a group of images into a slideshow. The problem may have something to do with the script as well. In any case, I have tried a seeming infinite number of combination of floating left and clearing left on all all the divs, changing their positions and widths...nothing works. Anyone have any clues about how to broach this one? EDIT 1: ok, should I be editing my post or responding with answers? here's the url to see the problem I am having - http://friedmanstudios.ca/webdev/test8.html and the code: <div id="content" class="boxes"> <table> <tr> <td > <div id="imageFrame"> <a href="#" class="img" title="_MG_9786_fmt.jpeg"> <img src="images/_MG_9786_fmt.jpeg"/> </a> <a href="#" class="img" title="IMG_5169_fmt.jpeg"> <img src="indesign export/GFA-TEARSHEETS-100526-01-web-images/IMG_5169_fmt.jpeg"/> </a> <a href="#" class="img" title="IMG_5175_fmt.jpeg"> <img src="indesign export/GFA-TEARSHEETS-100526-01-web-images/IMG_5175_fmt.jpeg"/> </a> <a href="#" class="img" title="aerial_fmt.jpeg" width=""> <img src="indesign export/GFA-TEARSHEETS-100526-01-web-images/aerial_fmt.jpeg"/> </a> </div> <div id="cycleCtrl"> <div id="prev" class="pager"><a href="#">< Prev</a> </div> <div id="next" class="pager"><a href="#">Next ></a></div> <div id="pagerNav" class="pager"></div> </div> <div id="descController"> <img src="images/arrow.gif" name="arrow" width="5" height="10" id="arrow" /> <span id="projectName">Toronto Centre for the Arts </span> <br /> <div id="desc"> In the past eight years... </div> </div></td> <td width="90%"></td> </tr> </table> and the styles: #content { position: absolute; top: 250px; left: 275px; float: left; clear: both; } content table { float: left; width: 1px; } imageFrame { position: relative; float: left; clear: left; width: inherit; } desc { position: relative; clear: left; float: left; } descController { position:relative; padding-top:5px; padding-bottom:10px; clear: left; float: left; } descController div { height:0; overflow:hidden; -webkit-transition:all .5s ease; -moz-transition:all .5s ease; -o-transition:all .5s ease; transition:all .5s ease; padding-top:10px; margin-top: 10px; word-spacing: 0em; line-height: 16px; font-size: 12px; position: relative; float: left; clear: left; }

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Error 0x800f0922 installing .NET 3.5 on Windows 8

- by Benjamin Nolan

I'm trying to install .NET 3.5 on my Windows 8 box and it keeps throwing Error 0x800f0922 at me. From what I've read on answers.microsoft.com and StackOverflow I gather the easiest way to fix this is to perform a system refresh, however this will remove all software I've installed from discs. I've just moved house, so I'd rather not do that as I don't know where all the installation media actually are for a lot of my software, so if possible I'd prefer to track down where the problem is actually occurring. (Also, I have a LOT of software installed. It'd take me a long time to reinstall it all, and I unfortunately haven't got that time.) The on-demand error screen sends me to KB2734782 (can't link it as I'm <10 rep), which doesn't help much. When I run this DISM line from the StackOverflow post: Dism.exe /online /enable-feature /featurename:NetFX3 /All /Source:C:\Windows\WinSxS /LimitAccess I get the following output on the terminal: Microsoft Windows [Version 6.2.9200] (c) 2012 Microsoft Corporation. All rights reserved. C:\Windows\system32>Dism.exe /online /enable-feature /featurename:NetFX3 /All /Source:C:\Windows\WinSxS /LimitAccess Deployment Image Servicing and Management tool Version: 6.2.9200.16384 Image Version: 6.2.9200.16384 Enabling feature(s) [==========================100.0%==========================] Error: 0x800f0922 DISM failed. No operation was performed. For more information, review the log file. The DISM log file can be found at C:\Windows\Logs\DISM\dism.log C:\Windows\system32> Incidentally, it jumps straight from 0 to 100% and then sits on that line for about 5 minutes before the error line occurs. dism.log contains the following lines around that time: (Link to full logs is at bottom of post) 2013-07-02 00:56:58, Info DISM DISM.EXE: Succesfully registered commands for the provider: Edition Manager. 2013-07-02 00:56:58, Info DISM DISM Provider Store: PID=5768 TID=5780 Getting Provider DISM Package Manager - CDISMProviderStore::GetProvider 2013-07-02 00:56:58, Info DISM DISM Provider Store: PID=5768 TID=5780 Provider has previously been initialized. Returning the existing instance. - CDISMProviderStore::Internal_GetProvider 2013-07-02 00:56:58, Info DISM DISM Package Manager: PID=5768 TID=5780 Processing the top level command token(enable-feature). - CPackageManagerCLIHandler::Private_ValidateCmdLine 2013-07-02 00:56:58, Info DISM DISM Package Manager: PID=5768 TID=5780 Attempting to route to appropriate command handler. - CPackageManagerCLIHandler::ExecuteCmdLine 2013-07-02 00:56:58, Info DISM DISM Package Manager: PID=5768 TID=5780 Routing the command... - CPackageManagerCLIHandler::ExecuteCmdLine 2013-07-02 00:56:58, Info DISM DISM Package Manager: PID=5768 TID=5780 Encountered the option "featurename" with value "NetFX3" - CPackageManagerCLIHandler::Private_GetPackagesFromCommandLine 2013-07-02 00:56:58, Info DISM DISM Package Manager: PID=5768 TID=5780 Encountered an unknown option "featurename" with value "NetFX3" - CPackageManagerCLIHandler::Private_GetPackagesFromCommandLine 2013-07-02 00:56:58, Info DISM DISM Package Manager: PID=5768 TID=5780 Encountered the option "source" with value "C:\Windows\WinSxS" - CPackageManagerCLIHandler::Private_GetPackagesFromCommandLine 2013-07-02 00:56:58, Info DISM DISM Package Manager: PID=5768 TID=5780 Encountered an unknown option "source" with value "C:\Windows\WinSxS" - CPackageManagerCLIHandler::Private_GetPackagesFromCommandLine 2013-07-02 00:56:59, Info DISM DISM Package Manager: PID=5768 TID=5780 Initiating Changes on Package with values: 5, 7 - CDISMPackage::Internal_ChangePackageState 2013-07-02 00:56:59, Info DISM DISM Package Manager: PID=5768 TID=5780 CBS session options=0x20100! - CDISMPackageManager::Internal_Finalize 2013-07-02 01:00:27, Info DISM DISM Package Manager: PID=5768 TID=2420 Error in operation: (null) (CBS HRESULT=0x800f0922) - CCbsConUIHandler::Error 2013-07-02 01:00:27, Error DISM DISM Package Manager: PID=5768 TID=5780 Failed finalizing changes. - CDISMPackageManager::Internal_Finalize(hr:0x800f0922) 2013-07-02 01:00:27, Error DISM DISM Package Manager: PID=5768 TID=5780 Failed processing package changes with session options - CDISMPackageManager::ProcessChangesWithOptions(hr:0x800f0922) 2013-07-02 01:00:27, Error DISM DISM Package Manager: PID=5768 TID=5780 Failed ProcessChanges. - CPackageManagerCLIHandler::Private_ProcessFeatureChange(hr:0x800f0922) 2013-07-02 01:00:27, Error DISM DISM Package Manager: PID=5768 TID=5780 Failed while processing command enable-feature. - CPackageManagerCLIHandler::ExecuteCmdLine(hr:0x800f0922) 2013-07-02 01:00:27, Info DISM DISM Package Manager: PID=5768 TID=5780 Further logs for online package and feature related operations can be found at %WINDIR%\logs\CBS\cbs.log - CPackageManagerCLIHandler::ExecuteCmdLine 2013-07-02 01:00:27, Error DISM DISM.EXE: DISM Package Manager processed the command line but failed. HRESULT=800F0922 cbs.log has the following chunks around then which could be relevant: 2013-07-02 00:55:06, Info CBS Exec: This is a PSF Package. Job has been saved and we are returning to client. 2013-07-02 00:55:06, Info CSI 0000042d@2013/7/1:23:55:06.203 CSI Transaction @0xe2f5e59500 destroyed 2013-07-02 00:55:06, Info CBS Exec: DPX job state saved for one or more packages, aborting the staging and install of execution. 2013-07-02 00:55:06, Info CSI 0000042e@2013/7/1:23:55:06.207 CSI Transaction @0xe2f5e58480 destroyed 2013-07-02 00:55:06, Info CBS Perf: Stage chain complete. 2013-07-02 00:55:06, Info CBS Failed to stage execution chain. [HRESULT = 0x800f0816 - CBS_E_DPX_JOB_STATE_SAVED] 2013-07-02 00:55:06, Info CBS Failed to process single phase execution. [HRESULT = 0x800f0816 - CBS_E_DPX_JOB_STATE_SAVED] 2013-07-02 00:55:06, Info CBS WER: Failure is not worth reporting [HRESULT = 0x800f0816 - CBS_E_DPX_JOB_STATE_SAVED] 2013-07-02 00:55:06, Info CBS Reboot mark cleared and further down: 2013-07-02 00:59:19, Info CSI 000004e6 Begin executing advanced installer phase 38 (0x00000026) index 253 (0x00000000000000fd) (sequence 289) Old component: [l:0]"" New component: [ml:306{153},l:304{152}]"NetFx35CDF-CDF_GenericCommands, Culture=neutral, Version=6.2.9200.16384, PublicKeyToken=31bf3856ad364e35, ProcessorArchitecture=x86, versionScope=NonSxS" Install mode: install Installer ID: {81a34a10-4256-436a-89d6-794b97ca407c} Installer name: [15]"Generic Command" 2013-07-02 00:59:19, Info CSI 000004e7 Performing 1 operations; 1 are not lock/unlock and follow: (0) LockComponentPath (10): flags: 0 comp: {l:16 b:19fc6600b776ce01c91f0000fc07a816} pathid: {l:16 b:19fc6600b776ce01ca1f0000fc07a816} path: [l:214{107}]"\SystemRoot\WinSxS\x86_netfx35cdf-cdf_genericcommands_31bf3856ad364e35_6.2.9200.16384_none_0cec490be12fb858" pid: 7fc starttime: 130171962799582915 (0x01ce76b5e2626ec3) 2013-07-02 00:59:19, Info CSI 000004e8 Performing 1 operations; 1 are not lock/unlock and follow: (0) LockComponentPath (10): flags: 0 comp: {l:16 b:27236700b776ce01cb1f0000fc07a816} pathid: {l:16 b:27236700b776ce01cc1f0000fc07a816} path: [l:210{105}]"\SystemRoot\WinSxS\x86_netfx35cdf-csd_cdf_installer_31bf3856ad364e35_6.2.9200.16384_none_55072425fd5c3716" pid: 7fc starttime: 130171962799582915 (0x01ce76b5e2626ec3) 2013-07-02 00:59:19, Info CSI 000004e9 Calling generic command executable (sequence 1): [122]"C:\Windows\WinSxS\x86_netfx35cdf-csd_cdf_installer_31bf3856ad364e35_6.2.9200.16384_none_55072425fd5c3716\WFServicesReg.exe" CmdLine: [139]""C:\Windows\WinSxS\x86_netfx35cdf-csd_cdf_installer_31bf3856ad364e35_6.2.9200.16384_none_55072425fd5c3716\WFServicesReg.exe" /c /b /v /m /i" 2013-07-02 00:59:20, Info CSI 000004ea Performing 1 operations; 1 are not lock/unlock and follow: (0) LockComponentPath (10): flags: 0 comp: {l:16 b:bd790401b776ce01cd1f0000fc07a816} pathid: {l:16 b:bd790401b776ce01ce1f0000fc07a816} path: [l:234{117}]"\SystemRoot\WinSxS\x86_microsoft.windows.s..ation.badcomponents_31bf3856ad364e35_6.2.9200.16384_none_353ccb4c94858655" pid: 7fc starttime: 130171962799582915 (0x01ce76b5e2626ec3) 2013-07-02 00:59:20, Info CSI 000004eb Creating NT transaction (seq 27), objectname [6]"(null)" 2013-07-02 00:59:20, Info CSI 000004ec Created NT transaction (seq 27) result 0x00000000, handle @0x24b8 2013-07-02 00:59:20, Info CSI 000004ed@2013/7/1:23:59:20.933 Beginning NT transaction commit... 2013-07-02 00:59:22, Info CSI 000004ee@2013/7/1:23:59:22.065 CSI perf trace: CSIPERF:TXCOMMIT;1387723 2013-07-02 00:59:22, Error CSI 000004ef (F) Done with generic command 1; CreateProcess returned 0, CPAW returned S_OK Process exit code 255 (0x000000ff) resulted in success? FALSE Process output: [l:28479 [4096]"DDSet_Entry: WFServicesReg.exe DDSet_Status: CFxInstaller::CopyConfigFilesToTemp is64bit=0 DDSet_Status: CFileHelper::CopyConfigFilesToTempLocation DDSet_Status: CFxInstaller::SetupBaseComponents isInstall=1 DDSet_Status: CFxInstaller::SetupBaseComponents Calling SetupExtensions. isInstall=1 (0x000000FF -- The extended attributes are inconsistent. ??) And a bit further down: 2013-07-02 00:59:22, Error [0x018007] CSI 000004f0 (F) Failed execution of queue item Installer: Generic Command ({81a34a10-4256-436a-89d6-794b97ca407c}) with HRESULT HRESULT_FROM_WIN32(14109). Failure will not be ignored: A rollback will be initiated after all the operations in the installer queue are completed; installer is reliable (2)[gle=0x80004005] [...snip...] 2013-07-02 00:59:22, Info CBS Not able to add pending.xml.bad to Windows Error Report. [HRESULT = 0x80070002 - ERROR_FILE_NOT_FOUND] 2013-07-02 00:59:28, Info CSI 000004f1@2013/7/1:23:59:28.467 CSI Advanced installer perf trace: CSIPERF:AIDONE;{81a34a10-4256-436a-89d6-794b97ca407c};NetFx35CDF-CDF_GenericCommands, Version = 6.2.9200.16384, pA = PROCESSOR_ARCHITECTURE_INTEL (0), Culture neutral, VersionScope = 1 nonSxS, PublicKeyToken = {l:8 b:31bf3856ad364e35}, Type neutral, TypeName neutral, PublicKey neutral;10609242us 2013-07-02 00:59:28, Info CSI 000004f2 End executing advanced installer (sequence 289) Completion status: HRESULT_FROM_WIN32(ERROR_ADVANCED_INSTALLER_FAILED) [...snip...] 2013-07-02 01:00:26, Info CBS Exec: Cancelled pending transactions after rollback. [HRESULT = 0x00000000 - S_OK] 2013-07-02 01:00:26, Error CBS Exec: An error occurred while committing the transaction, the transaction could not be rolled back. [HRESULT = 0x800f0922 - CBS_E_INSTALLERS_FAILED] The full DISM and CBS logs are at http://ben.mu/files/dotnet35_dism_cbs.zip as the CBS log is nearly 167MB uncompressed. o.o dism.log gives the timeframe of where its errors occur--00:56:20ish to 01:00:22. Does anyone have any ideas what's actually causing the installation to fail, and if so how I can fix it? Please don't just say "Refresh the OS". :)

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Problems configuring nameserver in plesk

- by Saif Bechan

Hello, i have some troubles with setting up a nameserver in PLESK for months now. I have tried all possible scenario's but i can not get this to work. I am really in need for some help, and if you can i will really appreciate it. Basically what i want is to just set up a nameserver in PLESK. I have a primary IP, and my host gave me a secondary nameserver i can use. My host is leaseweb in the netherlands. I have made some screenshots of the important parts in my opinion, maybe you guys can see some errors in them. To use the secondary nameserver provided by leaseweb i had to enable ACL on that account, i did so and made a screenshot of that too. The DNS recursion is set to localnets. These settings have not changed for months, so the dns should be fully updated everywhere. The check i run is the following: https://www.sidn.nl/over-nl/aanvraag...-server-check/ Domeinnaam (inclusief .nl): rdshosting.nl Eerste Nameserver: ns1.rdshosting.nl Eerste IP: 62.212.66.33 Tweede Nameserver: ns7.leaseweb.net Tweede ip: 62.212.76.50 If i run the dns check of the netherlands it gives me the following errors: primary name server "ns1.rdshosting.nl." Error: specified name server is not listed as NS record. All public name servers for a domain must also be listed as NS records in the zone of the domain. This domain was specified explicitly as a name server, but not found in the zone description of the primary name server. TE.6a rdshosting.nl. 86400 IN SOA ns1.rdspartners.nl. saif2k.hotmail.com. (2010031102 12H 1H 7D 3H) Error: the MNAME in SOA says "ns1.rdspartners.nl." is the primary name server. The MNAME field in the SOA record (first parameter) lists a different primary name server from the one specified for this check. RFC1035 section 3.3.13 rdshosting.nl. 86400 IN NS ns1.rdspartners.nl. Warning: hidden name server "ns1.rdspartners.nl." never used for first contact. The zone contains an NS record for a host which is not in the list of specified name servers. Hence, this name server will not be used to initiate contact to the domain. It may be used in sequential lookups, so it may still be useful. secondary name server "ns1.rdspartners.nl." [BROKEN] [HIDDEN] Failure: name server at 77.232.85.129 cannot be reached: (unknown error) The name server could not be contacted, which may be due to temporary technical problems or global DNS configuration mistakes. The internal error is shown, but not always clear about the cause. secondary name server "ns7.leaseweb.net." Info: name server looks correctly configured. I have the content of the file etc/named.conf also: // $Id: named.conf,v 1.1.1.1 2001/10/15 07:44:36 kap Exp $ // // Refer to the named(8) man page for details. If you are ever going // to setup a primary server, make sure you've understood the hairy // details of how DNS is working. Even with simple mistakes, you can // break connectivity for affected parties, or cause huge amount of // useless Internet traffic. options { allow-recursion { localnets; }; directory "/var"; auth-nxdomain no; pid-file "/var/run/named/named.pid"; // In addition to the "forwarders" clause, you can force your name // server to never initiate queries of its own, but always ask its // forwarders only, by enabling the following line: // // forward only; // If you've got a DNS server around at your upstream provider, enter // its IP address here, and enable the line below. This will make you // benefit from its cache, thus reduce overall DNS traffic in the Internet. /* forwarders { 127.0.0.1; }; */ /* * If there is a firewall between you and nameservers you want * to talk to, you might need to uncomment the query-source * directive below. Previous versions of BIND always asked * questions using port 53, but BIND 8.1 uses an unprivileged * port by default. */ // query-source address * port 53; /* * If running in a sandbox, you may have to specify a different * location for the dumpfile. */ // dump-file "s/named_dump.db"; }; //Use with the following in named.conf, adjusting the allow list as needed: key "rndc-key" { algorithm hmac-md5; secret "CeMgS23y0oWE20nyv0x40Q=="; }; controls { inet 127.0.0.1 port 953 allow { 127.0.0.1; } keys { "rndc-key"; }; }; // Note: the following will be supported in a future release. /* host { any; } { topology { 127.0.0.0/8; }; }; */ // Setting up secondaries is way easier and the rough picture for this // is explained below. // // If you enable a local name server, don't forget to enter 127.0.0.1 // into your /etc/resolv.conf so this server will be queried first. // Also, make sure to enable it in /etc/rc.conf. zone "." { type hint; file "named.root"; }; zone "0.0.127.IN-ADDR.ARPA" { type master; file "localhost.rev"; }; // NB: Do not use the IP addresses below, they are faked, and only // serve demonstration/documentation purposes! // // Example secondary config entries. It can be convenient to become // a secondary at least for the zone where your own domain is in. Ask // your network administrator for the IP address of the responsible // primary. // // Never forget to include the reverse lookup (IN-ADDR.ARPA) zone! // (This is the first bytes of the respective IP address, in reverse // order, with ".IN-ADDR.ARPA" appended.) // // Before starting to setup a primary zone, better make sure you fully // understand how DNS and BIND works, however. There are sometimes // unobvious pitfalls. Setting up a secondary is comparably simpler. // // NB: Don't blindly enable the examples below. :-) Use actual names // and addresses instead. // // NOTE!!! FreeBSD runs bind in a sandbox (see named_flags in rc.conf). // The directory containing the secondary zones must be write accessible // to bind. The following sequence is suggested: // // mkdir /etc/namedb/s // chown bind.bind /etc/namedb/s // chmod 750 /etc/namedb/s zone "rdshosting.nl" { type master; file "rdshosting.nl"; allow-transfer { 77.232.85.129; 62.212.76.50; common-allow-transfer; }; }; zone "66.212.62.in-addr.arpa" { type master; file "66.212.62.in-addr.arpa"; allow-transfer { common-allow-transfer; }; }; acl common-allow-transfer { 62.212.76.50; }; As i mentioned i made some screenshots of some parts: First the dns settings in plesk: http://www.freeimagehosting.net/uploads/2480faed5e.jpg Second the acl settings in plesk: http://www.freeimagehosting.net/uploads/777f5e69b0.jpg Third my settings at leaseweb: http://www.freeimagehosting.net/uploads/de7122b19c.jpg And last the secondary nameserver settings from leaseweb: http://www.freeimagehosting.net/uploads/fd1da38a8f.jpg If someone has anysuggestion at all on this this will be highly appriciated. Thank you for your time! PS. I am dutch so dutch answers are welcome aswell

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How to get Passive FTP Working Through an Iptables Firewall?

- by user1133248

I have an iptables firewall running on a Fedora Linux server that is basically being used as a firewall router and OpenVPN server. That's it. We have been using the same iptables firewall code for YEARS. I did make some changes on 21 December to re-route a mySQL port, but given what has happened I've completely backed those changes out. Sometime after those changes were made and backed out passive FTP, served from a vsftpd process, stopped working. We use a passive ftp client to FLING (that's the name of the ftp client running under Windows! :-) ) images from our remote telescopes to our server. I believe it is something in the firewall code because I can drop the firewall and the FTP file transfer (and connecting to the ftp site with Internet Explorer to see the file list) works. When I raise the iptables firewall, it stops working. Again, this is code that we'd been using for years. However, I felt that maybe there was something I missed, so we had a .bak file from 2009 that I used. Same behavior, passive ftp does not work. So, I went and rebuilt the firewall code line by line to see what line was causing the problem. Everything worked until I put the line -A FORWARD -j DROP in very near the end. Of course, if I am correct, this is the line that basically "turns on" the firewall, saying drop everything except for the exceptions I've made above. However, this line has been in the iptables code probably since 2003. So, I'm at the end of my rope, and I still can't figure out why this has stopped working. I guess I need an expert on iptables configuration. Here is the iptables code (from iptables-save) with comments. # Generated by iptables-save v1.3.8 on Thu Jan 5 18:36:25 2012 *nat # One of the things that I remain ignorant about is what these following three lines # do in both the nat tables (which we're not using on this machine) and the following # filter table. I don't know what the numbers are, but I'm ASSUMING they're port # ranges. # :PREROUTING ACCEPT [7435:551429] :POSTROUTING ACCEPT [6097:354458] :OUTPUT ACCEPT [5:451] COMMIT # Completed on Thu Jan 5 18:36:25 2012 # Generated by iptables-save v1.3.8 on Thu Jan 5 18:36:25 2012 *filter :INPUT ACCEPT [10423:1046501] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [15184:16948770] # The following line is for my OpenVPN configuration. -A INPUT -i tun+ -j ACCEPT # In researching this on the Internet I found some iptables code that was supposed to # open the needed ports up. I never needed this before this week, but since passive FTP # was no longer working, I decided to put the code in. The next three lines are part of # that code. -A INPUT -p tcp -m tcp --dport 21 -m state --state NEW,ESTABLISHED -j ACCEPT -A INPUT -p tcp -m tcp --sport 1024:65535 --dport 20 -m state --state ESTABLISHED -j ACCEPT -A INPUT -p tcp -m tcp --sport 1024:65535 --dport 1024:65535 -m state --state RELATED,ESTABLISHED -j ACCEPT # Another line for the OpenVPN configuration. I don't know why the iptables-save mixed # the lines up. -A FORWARD -i tun+ -j ACCEPT # Various forwards for all our services -A FORWARD -s 65.118.148.197 -p tcp -m tcp --dport 3307 -j ACCEPT -A FORWARD -d 65.118.148.197 -p tcp -m tcp --dport 3307 -j ACCEPT -A FORWARD -s 65.118.148.197 -p tcp -m tcp --dport 3306 -j ACCEPT -A FORWARD -d 65.118.148.197 -p tcp -m tcp --dport 3306 -j ACCEPT -A FORWARD -s 65.118.148.196 -p tcp -m tcp --dport 21 -j ACCEPT -A FORWARD -d 65.118.148.196 -p tcp -m tcp --dport 21 -j ACCEPT -A FORWARD -d 65.118.148.196 -p tcp -m tcp --dport 20 -j ACCEPT -A FORWARD -s 65.118.148.196 -p tcp -m tcp --dport 20 -j ACCEPT -A FORWARD -s 65.118.148.196 -p tcp -m tcp --dport 7191 -j ACCEPT -A FORWARD -d 65.118.148.196 -p tcp -m tcp --dport 7191 -j ACCEPT -A FORWARD -s 65.118.148.196 -p tcp -m tcp --dport 46000:46999 -j ACCEPT -A FORWARD -d 65.118.148.196 -p tcp -m tcp --dport 46000:46999 -j ACCEPT -A FORWARD -s 65.118.148.0/255.255.255.0 -j ACCEPT -A FORWARD -d 65.118.148.196 -p udp -m udp --dport 53 -j ACCEPT -A FORWARD -s 65.118.148.196 -p udp -m udp --dport 53 -j ACCEPT -A FORWARD -d 65.118.148.196 -p tcp -m tcp --dport 53 -j ACCEPT -A FORWARD -s 65.118.148.196 -p tcp -m tcp --dport 53 -j ACCEPT -A FORWARD -d 65.118.148.196 -p udp -m udp --dport 25 -j ACCEPT -A FORWARD -s 65.118.148.196 -p udp -m udp --dport 25 -j ACCEPT -A FORWARD -d 65.118.148.196 -p tcp -m tcp --dport 42 -j ACCEPT -A FORWARD -s 65.118.148.196 -p tcp -m tcp --dport 42 -j ACCEPT -A FORWARD -s 65.118.148.196 -p tcp -m tcp --dport 25 -j ACCEPT -A FORWARD -d 65.118.148.196 -p tcp -m tcp --dport 25 -j ACCEPT -A FORWARD -d 65.118.148.196 -p tcp -m tcp --dport 80 -j ACCEPT -A FORWARD -s 65.118.148.196 -p tcp -m tcp --dport 80 -j ACCEPT -A FORWARD -d 65.118.148.204 -p tcp -m tcp --dport 80 -j ACCEPT -A FORWARD -s 65.118.148.204 -p tcp -m tcp --dport 80 -j ACCEPT -A FORWARD -d 65.118.148.196 -p tcp -m tcp --dport 6667 -j ACCEPT -A FORWARD -s 65.118.148.196 -p tcp -m tcp --dport 6667 -j ACCEPT -A FORWARD -s 65.96.214.242 -p tcp -m tcp --dport 22 -j ACCEPT -A FORWARD -s 192.68.148.66 -p tcp -m tcp --dport 22 -j ACCEPT -A FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT # "The line" that causes passive ftp to stop working. Insofar as I can tell, everything # else seems to work - ssh, telnet, mysql, httpd. -A FORWARD -j DROP -A FORWARD -p icmp -j ACCEPT # The following code is again part of my attempt to put in code that would cause passive # ftp to work. I don't know why iptables-save scattered it about like this. -A OUTPUT -p tcp -m tcp --sport 21 -m state --state ESTABLISHED -j ACCEPT -A OUTPUT -p tcp -m tcp --sport 20 --dport 1024:65535 -m state --state RELATED,ESTABLISHED -j ACCEPT -A OUTPUT -p tcp -m tcp --sport 1024:65535 --dport 1024:65535 -m state --state ESTABLISHED -j ACCEPT COMMIT # Completed on Thu Jan 5 18:36:25 2012 So, with all that prelude, my basic question is: How can I get passive ftp to work behind an iptables firewall? As you can see, I've tried to get it working (again) and tried to do some research on the issue, but have come up...short. Any answers would be appreciated by both me and various variable star astronomers around the world! THANKS! -Richard "Doc" Kinne, American Assoc. of Variable Star Observers, [email protected]

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