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• XHR readyState = 4 but Status = 0 in Google Chrome Browser

  - by Jay

  Hello i'v got a strange Problem with an AJAX call on my site. I make a simple AJAX call to a Script on my site. But the AJAX call fails with readState=4 and Staus = 0. There's no cross domain problem because the script i want to call is on my server. $.ajax({ type:"GET", url: 'http://mydomain.com/test.php', success : function(response){ console.log(response); }, error : function(XHR){ console.log(arguments); } }); I 've googled a lot of sites but there seems to be no solution for that!

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• Object Oriented Design Questions

  - by Robert

  Hello there. I am going to develop a Tic-Tac-Toe game using Java(or maybe other OO Languages).Now I have a picture in my mind about the general design. Interface: Player ,then I will be able to implement a couple of Player classes,based on how I want the opponent to be,for example,random player,intelligent player. Classes: Board class,with a two-dimensional array of integers,0 indicates open,1 indicates me,-1 indicates opponent.The evaluation function will be in here as well,to return the next best move based on the current board arrangement and whose turn it is. Refree class,which will create instance of the Board and two player instances,then get the game begin. This is a rough idea of my OO design,could anybody give me any critiques please,I find this is really beneficial,thank you very much.

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• Returning IQueryable or Enumerated Object

  - by Tarik

  Hello everyone, I was wondering about the performance difference between these two scenarios and what could the disadvantages be over each other? First scenario : public class Helper //returns IQueryable { public IQueryable<Customer> CurrentCustomer { get{return new DataContext().Where(t=>t.CustomerId == 1); } } public class SomeClass { public void Main() { Console.WriteLine(new Helper().CurrentCustomer.First().Name; } } The second scenario : public class Helper //returns Enumerated result { public Customer CurrentCustomer { get{return new DataContext().First(t=>t.CustomerId == 1); } } public class SomeClass { public void Main() { Console.WriteLine(new Helper().CurrentCustomer.Name; } } Thanks in advance.

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• From actionscript to google's datastore through java.

  - by Jonathan

  I'm working on a flash game written in pure actionscript 3.0 in Flex. I've just finished implementing replays for the game, but want to store the top 10 hiscores' replay data on my google-app-engine'd website. I'm using Java for the app-engine stuff in Eclipse in java but I have no idea how to deal with communicating to my java code from my actionscript code. I'll need to both read and write from actionscript - java - datastore. Does anyone have any experience with this? For note, I'm horribly noob with anything to do with web development. I hear you can pass arguments to a URL when calling it, comparable to command-line arguments on a desktop executable and if so then sending all the data as a large string would be doable... The question then would be how to call a url from AS3 code with additional data and then how to catch that on the java side. Thanks to anyone who can help. Jono

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• availability of Win32_MountPoint and Win32_Volume on Windows XP?

  - by SteveC

  From the MSDN articles I've found -- http://msdn.microsoft.com/en-us/library/aa394515(v=VS.85).aspx -- Win32_Volume and Win32_MountPoint aren't available on Windows XP. However, I'm developing a C# app on Windows XP (64bit), and I can get to those WMI classes just fine. Users of my app will be on Windows XP sp2 with .Net 3.5 sp1. Googling around, I can't determine whether I can count on this or not. Am I successful on my system because of one or more of the following: - windows xp service pack 2? - visual studio 2008 sp1 was installed? - .Net 3.5 sp1? Should I use something other than WMI to get at the volume/mountpoint info? Below is sample code that's working... public static Dictionary<string, NameValueCollection> GetAllVolumeDeviceIDs() { Dictionary<string, NameValueCollection> ret = new Dictionary<string, NameValueCollection>(); // retrieve information from Win32_Volume try { using (ManagementClass volClass = new ManagementClass("Win32_Volume")) { using (ManagementObjectCollection mocVols = volClass.GetInstances()) { // iterate over every volume foreach (ManagementObject moVol in mocVols) { // get the volume's device ID (will be key into our dictionary) string devId = moVol.GetPropertyValue("DeviceID").ToString(); ret.Add(devId, new NameValueCollection()); //Console.WriteLine("Vol: {0}", devId); // for each non-null property on the Volume, add it to our NameValueCollection foreach (PropertyData p in moVol.Properties) { if (p.Value == null) continue; ret[devId].Add(p.Name, p.Value.ToString()); //Console.WriteLine("\t{0}: {1}", p.Name, p.Value); } // find the mountpoints of this volume using (ManagementObjectCollection mocMPs = moVol.GetRelationships("Win32_MountPoint")) { foreach (ManagementObject moMP in mocMPs) { // only care about adding directory // Directory prop will be something like "Win32_Directory.Name=\"C:\\\\\"" string dir = moMP["Directory"].ToString(); // find opening/closing quotes in order to get the substring we want int first = dir.IndexOf('"') + 1; int last = dir.LastIndexOf('"'); string dirSubstr = dir.Substring(first , last - first); // use GetFullPath to normalize/unescape any extra backslashes string fullpath = Path.GetFullPath(dirSubstr); ret[devId].Add(MOUNTPOINT_DIRS_KEY, fullpath); } } } } } } catch (Exception ex) { Console.WriteLine("Problem retrieving Volume information from WMI. {0} - \n{1}",ex.Message,ex.StackTrace); return ret; } return ret; }

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• WPF: Modifying CollectionView from Dispatcher still throws errors

  - by Dusda

  I have the following bit of code that modifies an observable collection of 'screens' whenever a user leaves. void OnUserLeft(int roomId, int userId, string username) { client.ClientDispatcher.Invoke( (Action<int>)((id) => { Console.WriteLine("Hello before the storm!"); var screensToCheck = client.Screens.Where(s => s.CpuId == id).ToList(); screensToCheck.Each(s => client.Screens.Remove(s)); Console.WriteLine("Hello there!"); }), userId); } This is wrapped in a call to the client's Dispatcher, supposedly to get past the threading issues related to CollectionViews. However, I still get the following exception: This type of CollectionView does not support changes to its SourceCollection from a thread different from the Dispatcher thread. The Dispatcher you see above is set in the WPF application's MainViewModel (we're using MVVM), like so: public Dispatcher ClientDispatcher { get { return Dispatcher.CurrentDispatcher; } }

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• GameKit and GKPeerPicker on 1st Gen iPhone and iPod Touch

  - by Reese McLean

  This is my current set up for my multiplayer game: A view that gives connection tips and warns the user that multiplayer will not work on the 1st Gen iPhone or ipod Touch. There is a "connect" button that pushes the game view and starts the GKPeerPicker. Unfortunately, I don't have a 1st Gen iPhone or iPod Touch to test what happens if they press the connect button. The view will be pushed, but I don't know what will happen when the PeerPicker tries to show. So the Question(s): Is there anyway to tell if the user will not be able to use GameKit so that I can disable the "connect" button? What will happen if they do press the connect button and GameKit is not available?

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• QueryInterface fails at casting inside COM-interface implementation

  - by brecht

  I am creating a tool in c# to retrieve messages of a CAN-network (network in a car) using an Dll written in C/C++. This dll is usable as a COM-interface. My c#-formclass implements one of these COM-interfaces. And other variables are instantiated using these COM-interfaces (everything works perfect). The problem: The interface my C#-form implements has 3 abstract functions. One of these functions is called -by the dll- and i need to implement it myself. In this function i wish to retrieve a property of a form-wide variable that is of a COM-type. The COM library is CANSUPPORTLib The form-wide variable: private CANSUPPORTLib.ICanIOEx devices = new CANSUPPORTLib.CanIO(); This variable is also form-wide and is retrieved via the devices-variable: canreceiver = (CANSUPPORTLib.IDirectCAN2)devices.get_DirectDispatch(receiverLogicalChannel); The function that is called by the dll and implemented in c# public void Message(double dTimeStamp) { Console.WriteLine("!!! message ontvangen !!!" + Environment.NewLine); try { CANSUPPORTLib.can_msg_tag message = new CANSUPPORTLib.can_msg_tag(); message = (CANSUPPORTLib.can_msg_tag) System.Runtime.InteropServices.Marshal.PtrToStructure(canreceiver.RawMessage, message.GetType()); for (int i = 0; i < message.data.Length; i++) { Console.WriteLine("byte " + i + ": " + message.data[i]); } } catch (Exception e) { Console.WriteLine(e.Message); } } The error rises at this line: message = (CANSUPPORTLib.can_msg_tag)System.Runtime.InteropServices.Marshal.PtrToStructure(canreceiver.RawMessage, message.GetType()); Error: Unable to cast COM object of type 'System.__ComObject' to interface type 'CANSUPPORTLib.IDirectCAN2'. This operation failed because the QueryInterface call on the COM component for the interface with IID '{33373EFC-DB42-48C4-A719-3730B7F228B5}' failed due to the following error: No such interface supported (Exception from HRESULT: 0x80004002 (E_NOINTERFACE)). Notes: It is possible to have a timer-clock that checks every 100ms for the message i need. The message is then retrieved in the exact same way as i do now. This timer is started when the form starts. The checking is only done when Message(double) has put a variable to true (a message arrived). When the timer-clock is started in the Message function, i have the same error as above Starting another thread when the form starts, is also not possible. Is there someone with experience with COM-interop ? When this timer

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• Making the domain-model of tic tac toe

  - by devoured elysium

  I am trying to make the domain model of a Tic Tac Toe game. I'll try then to go on through the various steps of the Unified Process and later implement it in some language (C# or Java). I'd like to have some feedback if I'm going on the right path: I've defined the game with two actors, Player O and Player X. I'm not sure about defining both a Tile and a Tile State. Maybe I should only define a Tile and have the 3 possible states specialize from it? I'm not sure what is best: to have both Player O and Player X be associations with Tic Tac Toe or have them inherit from Player that is associated with Tic Tac Toe. Following the design shown on the pic, in theory we could have a Tic Tac Toe concept with 2 Player O's, which wouldn't be correct. What is your opinion on this? Also, am I missing something in the diagram? Although I can't see any other actors for Tic Tac Toe, should I have any other? Thanks

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• Firebug not breaking on errors

  - by stormdrain

  Hi. I reinstalled Firefox today, because... whatever. I reinstalled firebug, therefully, and now when I try to use it, it's all different. I believe it is the same version I had before. In fact, I even went digging through my trash and replaced the new firebug with the one I removed with the old Firefox. They ended up being the same version (1.5.3). My issue is, when I have an error in my script somewhere, it used to be that if on the script pane of firebug, the script would break on the error, and the script page would go to the offending line, highlighted, and all was right with the world. Now, it logs the error in the console, and that's it. I've spent the better part of the last hour trying to convince myself this isn't worth an ulcer; I am losing the battle, though. I've searched Google, put ads on Craigslist, even thought about becoming a cop. There were some examples on the Firebug dox, but none of them helped. A bunch of old references to a mysterious (break on all errors) option; an option which I think I might have set by accident--there is a little red circle-slash on my pause button (that's what she said), but there the script continues, all on its own. There was a guide somewhere on the firebug pages that spoke of setting the breakpoint next to the error in the console. I, however, don't have this option for some reason. The line of code is there in the console, but no breakpoint button next to it. This, however, would not be ideal even if it worked. I liked it when I could have the script page open, and if there were errors it would jump to that line. I could try to fix it, and re-load the page. If that line was fixed, GREAT, on to the next error on the page -- which would be highlighted and ready. I would like to offer a solicitation of help. Help.

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• How to Increment Visual Studio build number using C++?

  - by Brock Woolf

  I have a Visual Studio 2008 project that produces a file called: "Game-Release.exe". This was configured under Project Properties - C/C++ - Linker - General: $(OutDir)\$(ProjectName)-Release.exe I would like to take this a bit further by have an incrementing build number so I would have something which says: Game-Release-Build-1002.exe The number on the end should be an incrementing integer. I will be storing the build exe's on subversion so I think i would find this useful (although not necessary). Perhaps there is a built in macro in Visual Studio that could handle this. Quite possibly I was thinking I could have a text file with the build number in it and have the compiler read, use and increment the number in the file each time the project is built. My goal is however to make the process as automated as possible. What is the best way to accomplish this? If you offer an opinion, please also provide the code we can all share. Thnx.

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• JavaScript to detect if the parent frame is of the same origin?

  - by tlrobinson

  I'm looking for a cross-browser way to detect whether the parent frame is the same origin as my frame, preferably without printing warnings on the JavaScript error console. The following seems to work but I'd like to avoid printing errors to the console (at least Safari and Chrome do when accessing location.href on the parent frame. Firefox throws an exception which can be caught): function parentIsSameOrigin() { var result = true; try { result = window.parent.location.href !== undefined; } catch (e) { result = false; } return result; }

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• Sharepoint : Access denied when editing a page (because of page layout) or list item

  - by tinky05

  I'm logged in as the System Account, so it's probably not a "real access denied"! What I've done : - A custom master page - A custom page layout from a custom content type (with custom fields) If I add a custom field (aka "content field" in the tools in SPD) in my page layout, I get an access denied when I try to edit a page that comes from that page layout. So, for example, if I add in my page layout this line in a "asp:content" tag : I get an access denied. If I remove it, everyting is fine. (the field "test" is a field that comes from the content type). Any idea? UPDATE Well, I tried in a blank site and it worked fine, so there must be something wrong with my web application :( UPDATE #2 Looks like this line in the master page gives me the access denied : <SharePoint:DelegateControl runat="server" ControlId="PublishingConsole" Visible="false" PrefixHtml="&lt;tr&gt;&lt;td colspan=&quot;0&quot; id=&quot;mpdmconsole&quot; class=&quot;s2i-consolemptablerow&quot;&gt;" SuffixHtml="&lt;/td&gt;&lt;/tr&gt;"></SharePoint:DelegateControl> UPDATE #3 I Found http://odole.wordpress.com/2009/01/30/access-denied-error-message-while-editing-properties-of-any-document-in-a-moss-document-library/ Looks like a similar issue. But our Sharepoint versions are with the latest updates. I'll try to use the code that's supposed to fix the lists and post another update. ** UPDATE #4** OK... I tried the code that I found on the page above (see link) and it seems to fix the thing. I haven't tested the solution at 100% but so far, so good. Here's the code I made for a feature receiver (I used the code posted from the link above) : using System; using System.Collections.Generic; using System.Text; using Microsoft.SharePoint; using System.Xml; namespace MyWebsite.FixAccessDenied { class FixAccessDenied : SPFeatureReceiver { public override void FeatureActivated(SPFeatureReceiverProperties properties) { FixWebField(SPContext.Current.Web); } public override void FeatureDeactivating(SPFeatureReceiverProperties properties) { //throw new Exception("The method or operation is not implemented."); } public override void FeatureInstalled(SPFeatureReceiverProperties properties) { //throw new Exception("The method or operation is not implemented."); } public override void FeatureUninstalling(SPFeatureReceiverProperties properties) { //throw new Exception("The method or operation is not implemented."); } static void FixWebField(SPWeb currentWeb) { string RenderXMLPattenAttribute = "RenderXMLUsingPattern"; SPSite site = new SPSite(currentWeb.Url); SPWeb web = site.OpenWeb(); web.AllowUnsafeUpdates = true; web.Update(); SPField f = web.Fields.GetFieldByInternalName("PermMask"); string s = f.SchemaXml; Console.WriteLine("schemaXml before: " + s); XmlDocument xd = new XmlDocument(); xd.LoadXml(s); XmlElement xe = xd.DocumentElement; if (xe.Attributes[RenderXMLPattenAttribute] == null) { XmlAttribute attr = xd.CreateAttribute(RenderXMLPattenAttribute); attr.Value = "TRUE"; xe.Attributes.Append(attr); } string strXml = xe.OuterXml; Console.WriteLine("schemaXml after: " + strXml); f.SchemaXml = strXml; foreach (SPWeb sites in site.AllWebs) { FixField(sites.Url); } } static void FixField(string weburl) { string RenderXMLPattenAttribute = "RenderXMLUsingPattern"; SPSite site = new SPSite(weburl); SPWeb web = site.OpenWeb(); web.AllowUnsafeUpdates = true; web.Update(); System.Collections.Generic.IList<Guid> guidArrayList = new System.Collections.Generic.List<Guid>(); foreach (SPList list in web.Lists) { guidArrayList.Add(list.ID); } foreach (Guid guid in guidArrayList) { SPList list = web.Lists[guid]; SPField f = list.Fields.GetFieldByInternalName("PermMask"); string s = f.SchemaXml; Console.WriteLine("schemaXml before: " + s); XmlDocument xd = new XmlDocument(); xd.LoadXml(s); XmlElement xe = xd.DocumentElement; if (xe.Attributes[RenderXMLPattenAttribute] == null) { XmlAttribute attr = xd.CreateAttribute(RenderXMLPattenAttribute); attr.Value = "TRUE"; xe.Attributes.Append(attr); } string strXml = xe.OuterXml; Console.WriteLine("schemaXml after: " + strXml); f.SchemaXml = strXml; } } } } Just put that code as a Feature Receiver, and activate it at the root site, it should loop trough all the subsites and fix the lists. SUMMARY You get an ACCESS DENIED when editing a PAGE or an ITEM You still get the error even if you're logged in as the Super Admin of the f****in world (sorry, I spent 3 days on that bug) For me, it happened after an import from another site definition (a cmp file) Actually, it's supposed to be a known bug and it's supposed to be fixed since February 2009, but it looks like it's not. The code I posted above should fix the thing.

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• log4j.xml show com.foo, but hide com.foo.bar

  - by Bas Hendriks

  Hi, I have the following log4j.xml configuration: <log4j:configuration> <appender name = "CONSOLE" class = "org.apache.log4j.ConsoleAppender"> <param name = "Target" value = "System.out"/> <param name = "Threshold" value = "DEBUG"/> </appender> <category name = "com.foo"> <appender-ref ref = "CONSOLE"/> </category> </log4j:configuration> This displays every log in com.foo.* . I want to disable logging in com.foo.bar.* . How do i do this.

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• Another design-related C++ question

  - by Kotti

  Hi! I am trying to find some optimal solutions in C++ coding patterns, and this is one of my game engine - related questions. Take a look at the game object declaration (I removed almost everything, that has no connection with the question). // Abstract representation of a game object class Object : public Entity, IRenderable, ISerializable { // Object parameters // Other not really important stuff public: // @note Rendering template will never change while // the object 'lives' Object(RenderTemplate& render_template, /* params */) : /*...*/ { } private: // Object rendering template RenderTemplate render_template; public: /** * Default object render method * Draws rendering template data at (X, Y) with (Width, Height) dimensions * * @note If no appropriate rendering method overload is specified * for any derived class, this method is called * * @param Backend & b * @return void * @see */ virtual void Render(Backend& backend) const { // Render sprite from object's // rendering template structure backend.RenderFromTemplate( render_template, x, y, width, height ); } }; Here is also the IRenderable interface declaration: // Objects that can be rendered interface IRenderable { /** * Abstract method to render current object * * @param Backend & b * @return void * @see */ virtual void Render(Backend& b) const = 0; } and a sample of a real object that is derived from Object (with severe simplifications :) // Ball object class Ball : public Object { // Ball params public: virtual void Render(Backend& b) const { b.RenderEllipse(/*params*/); } }; What I wanted to get is the ability to have some sort of standard function, that would draw sprite for an object (this is Object::Render) if there is no appropriate overload. So, one can have objects without Render(...) method, and if you try to render them, this default sprite-rendering stuff is invoked. And, one can have specialized objects, that define their own way of being rendered. I think, this way of doing things is quite good, but what I can't figure out - is there any way to split the objects' "normal" methods (like Resize(...) or Rotate(...)) implementation from their rendering implementation? Because if everything is done the way described earlier, a common .cpp file, that implements any type of object would generally mix the Resize(...), etc methods implementation and this virtual Render(...) method and this seems to be a mess. I actually want to have rendering procedures for the objects in one place and their "logic implementation" - in another. Is there a way this can be done (maybe alternative pattern or trick or hint) or this is where all this polymorphic and virtual stuff sucks in terms of code placement?

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• Parsing SGF files in C#

  - by mafutrct

  The text-based Smart Game Format has become the sole file format for exchanging Go game records by now. I stared with disbelieve that there are almost no parsers available. Google yielded a few results in antique Java and Python, but no modern implementations. I am curious if I have to write my own parser. Do you know of a modern implementation in C# or Java? In case there really are no parsers available, how should I implement one? Are there general guidelines or tools (in a C# environment) I should know of? This is an example file: (;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2] RU[Japanese]SZ[19]KM[6.50] PW[White]PB[Black] ;B[pd] ;W[dc] ;B[dq] ;W[pp] ;B[ce] (;W[ed] ;B[ci] ;W[kc]) (;W[do] ;B[dl] ;W[gp] ;B[eo] ;W[en] ;B[fo]))

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• lambda expressions in C#?

  - by Matt

  Hey I'm rather new to these could someone explain the significance (of the following code) or prehaps give a link to some useful information on lambda expressions? I encounter the following code in a test and I am wondering why someone would do this: foo.MyEvent += (o, e) => { fCount++; Console.WriteLine(fCount); }; foo.MyEvent -= (o, e) => { fCount++; Console.WriteLine(fCount); }; My instinct tells me it is something simple and not a mistake, but I don't know enough about these expressions to understand why this is being done. Regards,

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• What AMF Servers Support Remote Shared Objects?

  - by GrayB

  Greetings. I'm planning on building a Flex based multiplayer game, and I'm researching what will be required for the server end. I have PHP experience, so I started looking at ZendAMF. Now in this game, I'll need the concept of rooms, and real time updates to clients in those rooms, so it looks like I'll be using remote shared objects (correct, yes?). I'm not seeing where ZendAMF can support this. So I found this page: http://arunbluebrain.wordpress.com/2009/03/04/flex-frameworks-httpcorlanorg/ It seems to indicate that ZendAMF isn't going to do what I want. WebORB for PHP seems to be the only PHP based solution that does messaging, but on that page it doesn't mention "real-time" next to it like the Java based ones below it do. What should I be looking at for the server piece with my requirements? Do I need to make the jump to something like BlazeDS and try to pick up a bit of Java knowledge? Thanks.

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• Please help me decide how to figure out XNA's ContentPipeline

  - by DDTmanSP

  I have read this link : http://msdn.microsoft.com/en-us/library/bb464156.aspx They said : "... the XNA Framework Redistributable file does not contain the Content Pipeline Build Runtime. Building content at run time is supported only when XNA Game Studio has been installed on the Windows-based development computer." Actually, before I know of that, I have already used a lot of content pipeline to help me read out my game's assets. And because of that, I am now very headache to confront the publish's problem "The application requires that the assemblies Microsoft.Xna.Framework.Content.Pipeline 3.1.0.0 be installed ....." So I would like to find some ways that can help me solve this without convertion of my pipelines. So that I don't need to rewrite it all in new classes that manually load assets for me. Regard, DDTmanSP

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• Simple way to implement computer-go board in Java

  - by codingbear

  I want to make a simple Go board to design an Computer Go game. In a go game, you lie a "stone" (white or black) on a position where horizontal and vertical lines intersect. What are some simple ways to restrict users from placing their stones in other locations? Maybe I'm just not seeing a simple solution. EDIT I guess I should rephrase my question better: I want to know how to do the background image of Go board, so that I can lie my stones on the intersection of the horizontal and the vertical lines. I was thinking about getting a just regular Go board image, and when I'm actually rendering stones, I find right position of pixels to lie stones. However, that solution did not seem to be the best solution, since I need to worry about size of stone images and think about proportionality when I either expand or shrink the board window.

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• iPhone: Switching from a map screen to a battle screen without the map progress being reset

  - by user298261

  Hello! I'm trying to make a role-playing game, and I want the game to work so that it transitions to the battle NIB for battles, then returns back to the map NIB afterward, yet still retain all the progress the player has made exploring the dungeon. I've tried proto-typing this with just a view-switcher, where one view creates content, and then switches to the other view, and then coming back from the other view. However, once the view goes back to the original, the original view is reset. How to make the data persistent so that it doesn't reset after every "battle"? Thanks!

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• CCSprite following a sequence of CGPoints

  - by pgb

  I'm developing a line drawing game, similar to Flight Control, Harbor Master, and others in the appstore, using Cocos2D. For this game, I need a CCSprite to follow a line that the user has drawn. I'm storing a sequence of CGPoint structs in an NSArray, based on the points I get in the touchesBegin and touchesMoved messages. I now have the problem of how to make my sprite follow them. I have a tick method, that is called at the framerate speed. In that tick method, based on the speed and current position of the sprite, I need to calculate its next position. Is there any standard way to achieve this? My current approach is calculate the line between the last "reference point" and the next one, and calculate the next point in that line. The problem I have is when the sprite "turns" (moves from one segment of the line to another). Any hint will be greatly appreciated.

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• System.IO.IOException: file used by another process

  - by Srodriguez

  Dear all, I've been working in this small piece of code that seems trivial but still i cannot really see where is the problem. My functions does a pretty simple thing. Opens a file, copy its contents, replace a string inside and copy it back to the original file (a simple search and replace inside a text file then). I didn't really know how to do that as I'm adding lines to the original file, so i just create a copy of the file, (file.temp) copy also a backup (file.temp) then delete the original file(file) and copy the file.temp to file. I get an exception while doing the delete of the file. Here is the sample code: private static bool modifyFile(FileInfo file, string extractedMethod, string modifiedMethod) { Boolean result = false; FileStream fs = new FileStream(file.FullName + ".tmp", FileMode.Create, FileAccess.Write); StreamWriter sw = new StreamWriter(fs); StreamReader streamreader = file.OpenText(); String originalPath = file.FullName; string input = streamreader.ReadToEnd(); Console.WriteLine("input : {0}", input); String tempString = input.Replace(extractedMethod, modifiedMethod); Console.WriteLine("replaced String {0}", tempString); try { sw.Write(tempString); sw.Flush(); sw.Close(); sw.Dispose(); fs.Close(); fs.Dispose(); streamreader.Close(); streamreader.Dispose(); File.Copy(originalPath, originalPath + ".old", true); FileInfo newFile = new FileInfo(originalPath + ".tmp"); File.Delete(originalPath); File.Copy(fs., originalPath, true); result = true; } catch (Exception ex) { Console.WriteLine(ex); } return result; }` And the related exception System.IO.IOException: The process cannot access the file 'E:\mypath\myFile.cs' because it is being used by another process. at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath) at System.IO.File.Delete(String path) at callingMethod.modifyFile(FileInfo file, String extractedMethod, String modifiedMethod) Normally these errors come from unclosed file streams, but I've taken care of that. I guess I've forgotten an important step but cannot figure out where. Thank you very much for your help,

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• Finding minimum cut-sets between bounded subgraphs

  - by Tore

  If a game map is partitioned into subgraphs, how to minimize edges between subgraphs? I have a problem, Im trying to make A* searches through a grid based game like pacman or sokoban, but i need to find "enclosures". What do i mean by enclosures? subgraphs with as few cut edges as possible given a maximum size and minimum size for number of vertices for each subgraph that act as a soft constraints. Alternatively you could say i am looking to find bridges between subgraphs, but its generally the same problem. Given a game that looks like this, what i want to do is find enclosures so that i can properly find entrances to them and thus get a good heuristic for reaching vertices inside these enclosures. So what i want is to find these colored regions on any given map. My Motivation The reason for me bothering to do this and not just staying content with the performance of a simple manhattan distance heuristic is that an enclosure heuristic can give more optimal results and i would not have to actually do the A* to get some proper distance calculations and also for later adding competitive blocking of opponents within these enclosures when playing sokoban type games. Also the enclosure heuristic can be used for a minimax approach to finding goal vertices more properly. A possible solution to the problem is the Kernighan-Lin algorithm: function Kernighan-Lin(G(V,E)): determine a balanced initial partition of the nodes into sets A and B do A1 := A; B1 := B compute D values for all a in A1 and b in B1 for (i := 1 to |V|/2) find a[i] from A1 and b[i] from B1, such that g[i] = D[a[i]] + D[b[i]] - 2*c[a][b] is maximal move a[i] to B1 and b[i] to A1 remove a[i] and b[i] from further consideration in this pass update D values for the elements of A1 = A1 / a[i] and B1 = B1 / b[i] end for find k which maximizes g_max, the sum of g[1],...,g[k] if (g_max > 0) then Exchange a[1],a[2],...,a[k] with b[1],b[2],...,b[k] until (g_max <= 0) return G(V,E) My problem with this algorithm is its runtime at O(n^2 * lg(n)), i am thinking of limiting the nodes in A1 and B1 to the border of each subgraph to reduce the amount of work done. I also dont understand the c[a][b] cost in the algorithm, if a and b do not have an edge between them is the cost assumed to be 0 or infinity, or should i create an edge based on some heuristic. Do you know what c[a][b] is supposed to be when there is no edge between a and b? Do you think my problem is suitable to use a multi level problem? Why or why not? Do you have a good idea for how to reduce the work done with the kernighan-lin algorithm for my problem?

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• assign logon scripts to local users

  - by user311130

  Hello, I wrote a c# code that creates new local user DirectoryEntry localMachine = new DirectoryEntry("WinNT://" + Environment.MachineName + ",computer"); DirectoryEntry group = localMachine.Children.Find("administrators", "group"); DirectoryEntry user = localMachine.Children.Find(accountName, "user"); Console.WriteLine(user.Properties.ToString()); I tried to set the logon script for that user by doing: localMachine.Properties["scriptPath"].Insert(0, "logonScript.vbs"); localMachine.CommitChanges(); same with group or user instances.but the property doesn't exist in any of theses instances (localMachine, group or user). I know that because I did: System.Collections.ICollection col = localMachine.Properties.PropertyNames; foreach (Object ob in col) { Console.WriteLine(ob.ToString()); } Any idea of how to do that in other way?Cheers,

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