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• How to reset the value of NSInterval ?

  - by srikanth rongali

  I am writing a small game. After the completion of the game we get the previous screen. So, we can play again. But problem is that the time interval (NSTime Interval)started first time while running game is still continuing. For example the time interval of my touch when I first started game is 3.0 seconds. When again I played (not quitting the application) the time interval is 3.0 seconds + interval till the present touch ? Hoe can I make it work ? Please help me with solution for my problem.

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• How can I find file system concurrency issues ?

  - by krosenvold

  I have an application running on Linux, and I find myself wanting windows (!). The problem is that every 1000 times or so I run into concurrency problems that are consistent with concurrent reading/writing of files. I am fairly sure that this behavior would be prohibited by file locking under Windows, but I don't have any sufficiently fast windows box to check. There is simply too much file access (too much data) to expect strace to work reliably - the sheer volume of output is likely to change the problem too. It also happens on different files every time. Ideally I would like to change/reconfigure the linux file system to be more restrictive (as in fail-fast) wrt concurrent access. Are there any tools/settings I can use to achieve this ?

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• Probability Random Number Generator

  - by Excl

  Let's say I'm writing a simple luck game - each player presses Enter and the game assign him a random number between 1-6. Just like a cube. At the end of the game, the player with the highest number wins. Now, let's say I'm a cheater. I want to write the game so player #1 (which will be me) has a probability of 90% to get six, and 2% to get each of the rest numbers (1, 2, 3, 4, 5). So, how can I generate a number random, and set the probability for each number? Thanks.

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• Limited options for accessing events in derived classes?

  - by maxp

  Im refactoring a class, and moving sections into a base class. I have a few events similar to public event EventHandler GridBinding; Which are now in the base class, but i am finding i cannot now check to see if the event is null in my derived class. Doing so gives me the error: The event 'xyz.GridBinding' can only appear on the left hand side of += or -= (except when used from within the type 'xyz._MyBaseClass'). Is this correct, am i missing anything, or is there any way to get around this or is writing an accessor the only way to do this? I am using c#/.net 4.0

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• Insert query results into table in ms access 2010

  - by CodeMed

  I need to transform data from one schema into another in an MS Access database. This involves writing queries to select data from the old schema and then inserting the results of the queries into tables in the new schema. The below is an example of what I am trying to do. The SELECT component of the below works fine, but the INSERT component does not work. Can someone show me how to fix the below so that it effectively inserts the results of the SELECT statement into the destination table? INSERT INTO CompaniesTable (CompanyName) VALUES ( SELECT DISTINCT IIF(a.FIRM_NAME IS NULL, b.SUBACCOUNT_COMPANY_NAME, a.FIRM_NAME) AS CompanyName FROM (SELECT ContactID, FIRM_NAME, SUBACCOUNT_COMPANY_NAME FROM qrySummaryData) AS a LEFT JOIN (SELECT ContactID, FIRM_NAME, SUBACCOUNT_COMPANY_NAME FROM qrySummaryData) AS b ON a.ContactID = b.ContactID ); The definition of the target table (CompaniesTable) is: CompanyID Autonumber CompanyName Text Description Text WebSite Text Email Text TypeNumber Number

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• WANT TO host Visual Studio Form Designer in my own application..

  - by this. __curious_geek

  Hi, I'm writing an application that lets the end use design a Form just the way Visual Studio lets you design a windows forms. I looked into visual studio forms designer articles in msdn and also studied open-source SharpDevelop editor. Both the examples host visual studio's windows forms designer to provide form-design service in their respective applications. My question is - Does it imply any licensing issue with Microsoft for directly hosting their Visual Studio Forms designer in my own application ? I don't want move ahead without proper and correct information. Can anybody here help me out if there's any licensing issues in case I want to host visual studio windows fomr designer in my own application. If there's any such licensing implication - then how does Sharp-Develop do this ?

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• Finding the longest road in a Settlers of Catan game algorithmically

  - by Jay

  I'm writing a Settlers of Catan clone for a class. One of the extra credit features is automatically determining which player has the longest road. I've thought about it, and it seems like some slight variation on depth-first search could work, but I'm having trouble figuring out what to do with cycle detection, how to handle the joining of a player's two initial road networks, and a few other minutiae. How could I do this algorithmically? For those unfamiliar with the game, I'll try to describe the problem concisely and abstractly: I need to find the longest possible path in an undirected cyclic graph.

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• How to make full-screened MacOSX bundle killable?

  - by anon

  Exposition: I am writing an GLFW app on MacOSX. The app is a Mac bundle. I want my app to run in fullscreen mode (easy, use GLFW_FULLSCREEN). Problem is .. my code is still buggy, and I do not know how to kill a full-screened app that infinite loops (i.e. if the exit(0); is not called in the program; I don't know how to force kill it). Question is: how can I set up a MacOSX Glfw Bundle so taht I can force-kill it when it infinite loops? Thanks!

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• C# Proxy using Sockets, how should I do this?

  - by Kin

  I'm writing a proxy using .NET and C#. I haven't done much Socket programming, and I am not sure the best way to go about it. What would be the best way to implement this? Should I use Synchronous Sockets, Asynchronous sockets? Please help! It must... Accept Connections from the client on two different ports, and be able to receive data on both ports at the same time. Connect to the server on two different ports, and be able to send data on both ports as the same time. Immediately connect to the server and start forwarding packets as soon as a client connection is made. Forward packets in the same order they were received. Be as low latency as possible. I don't need the ability for multiple clients to connect to the proxy, but it would be a nice feature if its easy to implement. Client --------- Proxy ------- Server ---|-----------------|----------------| Port <-------- Port <------- Port Port <-------- Port <------- Port

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• SQL Query to delete oldest rows over a certain row count?

  - by Casey

  I have a table that contains log entries for a program I'm writing. I'm looking for ideas on an SQL query (I'm using SQL Server Express 2005) that will keep the newest X number of records, and delete the rest. I have a datetime column that is a timestamp for the log entry. I figure something like the following would work, but I'm not sure of the performance with the IN clause for larger numbers of records. Performance isn't critical, but I might as well do the best I can the first time. DELETE FROM MyTable WHERE PrimaryKey NOT IN (SELECT TOP 10,000 PrimaryKey FROM MyTable ORDER BY TimeStamp DESC)

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• Powershell: error handling with try and catch

  - by resolver101

  I'm writing a script and want to control the errors. However im having trouble finding information on error handling using the try, catch. I want to catch the specific error (shown below) and then perform some actions and resume the code. What code is needed for this? This is the code i am running and im entering in a invalid username when prompted. Get-WMIObject Win32_Service -ComputerName localhost -Credential (Get-Credential) Get-WmiObject : User credentials cannot be used for local connections At C:\Users\alex.kelly\AppData\Local\Temp\a3f819b4-4321-4743-acb5-0183dff88462.ps1:2 char:16 + Get-WMIObject <<<< Win32_Service -ComputerName localhost -Credential (Get-Credential) + CategoryInfo : InvalidOperation: (:) [Get-WmiObject], ManagementException + FullyQualifiedErrorId : GetWMIManagementException,Microsoft.PowerShell.Commands.GetWmiObjectCommand

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• Best way to use SFTP folder as concurrent work queue

  - by Gabe Moothart

  I am writing a c# windows service which will be polling an SFTP folder for new files (one file = one job) and processing them. Multiple instances of the service may be running at the same time, so it is important that they do not step on each other. I realize that an SFTP folder does not make an ideal queue, but that's what I have to work with. What do I need to do to either use this SFTP folder as a concurrent message queue, or safely represent it in a way that can be used concurrently?

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• How to estimate the thread context switching overhead?

  - by Ignas Limanauskas

  I am trying to improve the performance of the threaded application with real-time deadlines. It is running on Windows Mobile and written in C / C++. I have a suspicion that high frequency of thread switching might be causing tangible overhead, but can neither prove it or disprove it. As everybody knows, lack of proof is not a proof of opposite :). Thus my question is twofold: If exists at all, where can I find any actual measurements of the cost of switching thread context? Without spending time writing a test application, what are the ways to estimate the thread switching overhead in the existing application? Does anyone know a way to find out the number of context switches (on / off) for a given thread?

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• Non-string role names in ASP.NET MVC?

  - by MikeWyatt

  ASP.NET MVC has good support for role-based security, but the usage of strings as role names is maddening, simply because they cannot be strongly-typed as enumerations. For example, I have an "Admin" role in my app. The "Admin" string will now exist in the Authorize attribute of my action, in my master page (for hiding a tab), in my database (for defining the roles available to each user), and any other place in my code or view files where I need to perform special logic for admin or non-admin users. Is there a better solution, short of writing my own authorization attribute and filter, that would perhaps deal with a collection of enumeration values?

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• How do you deal with the conflict between ActiveSupport::JSON and the JSON gem?

  - by Luke Francl

  I am stumped with this problem. ActiveSupport::JSON defines to_json on various core objects and so does the JSON gem. However, the implementation is not the same -- the ActiveSupport version takes arguments and the JSON gem version doesn't. I installed a gem that required the JSON gem and my app broke. The issue is that I'm using to_json in a controller that returns a list of objects, but I want to control which attributes are returned. When code anywhere in my system does require 'json' I get this error message: TypeError: wrong argument type Hash (expected Data) I tried a couple of things that I read online to fix it, but nothing worked. I ended up re-writing the gem to use ActiveSupport::JSON.decode instead of JSON.parse. This works but it's not sustainable...I can't be forking gems every time I want to use a gem that requires the JSON gem. Update: The best solution of this problem is to upgrade to Rails 2.3 or higher, which fixed it.

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• Artificial Intelligence in online game using Google App Engine

  - by Hortinstein

  I am currently in the planning stages of a game for google app engine, but cannot wrap my head around how I am going to handle AI. I intend to have persistant NPCs that will move about the map, but short of writing a program that generates the same XML requests I use to control player actions, than run it on another server I am stuck on how to do it. I have looked at the Task Queue feature, but due to long running processes not being an option on the App engine, I am a little stuck. I intend to run multiple server instances with 200+ persistant NPC entities that I will need to update. Most action is slowly roaming around based on player movements/concentrations, and attacking close range players...(you can probably guess the type of game im developing)

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• Recursive function causing a stack overflow

  - by dbyrne

  I am trying to write a simple sieve function to calculate prime numbers in clojure. I've seen this question about writing an efficient sieve function, but I am not to that point yet. Right now I am just trying to write a very simple (and slow) sieve. Here is what I have come up with: (defn sieve [potentials primes] (if-let [p (first potentials)] (recur (filter #(not= (mod % p) 0) potentials) (conj primes p)) primes)) For small ranges it works fine, but causes a stack overflow for large ranges: user=> (sieve (range 2 30) []) [2 3 5 7 11 13 17 19 23 29] user=> (sieve (range 2 15000) []) java.lang.StackOverflowError (NO_SOURCE_FILE:0) I thought that by using recur this would be a non-stack-consuming looping construct? What am I missing?

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• Connection Strings between Web Application and SQL Server

  - by Raven Dreamer

  Greetings. I'm writing a web application that is supposed to connect to a SQL Server database; the connection is formed from the following database string: <add key="DatabaseConnectionString" value="server=DEVPC1\SQLEXPRESS;uid=USERID;pwd=PASSWORD;database=DATABASE"/> However, whenever I try and run the web application, I get a connection error, specifically: An error occurred attempting this login: Login failed for user 'USERID'. Any suggestions on how to go about debugging this? I'm not really familiar with SQL, so any suggestions would be greatly appreciated.

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• Is there a limit on the number of mutex objects that can be created in a Windows process?

  - by young-phillip

  I'm writing a c# application that can create a series of request messages. Each message could have a response, that needs to be waited on by a consumer. Where the number of outstanding request messages is constrained, I have used the windows EVENT to solve this problem. However, I know there is a limit on how many EVENT objects can be created in a single process, and in this instance, its possible I might exceed that limit. Does anyone know if there is a similar limit on creation of mutex objects or semaphores? I know this can be solved by some sort of pool of shared resources, that are grabbed by consumers when they need to wait, but it would be more convenient if each request message could have its own sync object.

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• Does anyone change the Visual Studio default bracing style in C# - Is there a standard?

  - by El Ronnoco

  I find the default bracing style a bit wasteful on line count eg... function foo() { if (...) { ... } else { ... } } would, if I was writing in JavaScript for example be written like... function foo() { if (...) { ... } else { ... } } ...which I understand may also not be to peoples' tastes. But the question(s) is/are do you turn off the VS formatting style and use your own rules? What is the opinion of this in the industry when many people are working on the same code-base? Is it better just to stick to the default just for simplicity/uniformity?

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• Passing user context to from impersonated thread to outproc COM object

  - by Thumbeti

  Hi, I am writing a CPP program on windows 2k3 where i want to achieve the following thing. Pass the user context from the impersonated thread to a outproc COM component. Steps what i m trying in details are: 1) Start an execution of exe with user USR1 2) Impersonate the current thread with USR2 3) Initiate a API on outproc COM object. And this COM object should run with USR2 What is happening: on 3rd step, COM object is getting started with USR1 only. Can anybody help me in passing the user context to COM object. Thanks in advance, Thumbeti

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• How to import a macro file (previously exported as .bas file) to Microsoft Word using command line?

  - by Nam Gi VU

  I'm writing a command-line program that has a step in which I need to replace text in a Word file. The replacing task is accomplished using Word macro. What I need to do now is to call this macro from command-line. At the moment we can do this by using the -mMacroName parameter of 'winword.exe', i.e. \winword.exe -mMacroName. But this need the macro to be already available as a global macro. Since I need to run the program on another computer, I need to import the above replacing macro programatically... and I don't know how to do this. Please help.

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• How To Keep Size Of JTextArea constant?

  - by Supereme

  Hi! I'm using an object of JTextArea in my application which deals with sending sms. I've used a DocumentFilter so as to allow only 160 characters to be typed in the textarea but now, I want the size of the textarea to be constant. it goes on increasing if I keep writing on the same line without pressing 'enter' key or even when I keep on pressing only 'enter' key. I tried once using 'scrollbar' too but the problem remains same. Suggest me something over this.

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• jquery background image rotating script doesn't work

  - by Catfish

  I'm writing this script to rotate a background Image every 3 seconds but it doesn't work at all and i'm stumped as to why not. $(document).ready(function() { var inc = 0; var bgImages = new Array(); bgImages.push("../Images/backgroundDog-small.jpg"); bgImages.push("../Images/backgroundDog1-small.jpg"); bgImages.push("../Images/backgroundDog2-small.jpg"); bgImages.push("../Images/backgroundDog3-small.jpg"); setInterval(change, 3000); function change() { //if we're not at the end of the array if (inc < (bgImages.length)) { var image = bgImages[inc]; $('body').css('backgroundImage', image); console.log(image); inc++; //reset the counter inc and go through the array again } else { inc = 0; } } });

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• Multithreading in PHP

  - by Jack

  I am working on windows. I am building a twitter application which periodically checks for new tweets as well as allows users to update their status. I have written separate PHP files for reading (reader.php) and writing tweets (writer.php). The only problem is how do I periodically read the tweets. There are a few ways which I can think of - 1) Use a time-based job scheduler (like Cron) to periodically run the reader.php. How do I do this? 2) Use multithreading to run both reader and writer.php and use a timer function in reader.php Suggestions?

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