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  • Simple integer encryption

    - by tloflin
    Is there a simple algorithm to encrypt integers? That is, a function E(i,k) that accepts an n-bit integer and a key (of any type) and produces another, unrelated n-bit integer that, when fed into a second function D(i,k) (along with the key) produces the original integer? Obviously there are some simple reversible operations you can perform, but they all seem to produce clearly related outputs (e.g. consecutive inputs lead to consecutive outputs). Also, of course, there are cryptographically strong standard algorithms, but they don't produce small enough outputs (e.g. 32-bit). I know any 32-bit cryptography can be brute-forced, but I'm not looking for something cryptographically strong, just something that looks random. Theoretically speaking it should be possible; after all, I could just create a dictionary by randomly pairing every integer. But I was hoping for something a little less memory-intensive.

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  • Integrate Lucene or any other search product with SQL server 2005

    - by HBACHARYA
    Hi, I need to use full text search with SQL server 2005 and I have explored its inbuilt search approach (SQL server full text indexing) but it seems less powerful. I have also looked features of Lucene. Now my questions: Is is possible to integrate lucene and SQL server in anyway? 1. Can my T-Sql queries use Lucene index for returning results? (May be uses CLR based function internally) 2. How to update Lucene index while data in the tables are getting updated 3. What can be overall architecutre? 4. Are there any commercial products avaliable which provides this kind of support? Thanks, HB

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  • how to handle large dataset like sproutcore

    - by Nik
    Hello all, I really don't have any substantial code to show here, actually, that's kinda why I am writing: I looked at the SproutCore demo, especially the Collection demo, on http://demo.sproutcore.com/sample_controls/, and am amazed by its loading 200,000 records to the page so easily. I tried using Rails to provide 200,000 records and in a completely blank HTML page with <% @projects.each do |p| % <%= p.title % <% end % that freezes the browser for seconds on my m1530 laptop with 4gb ram and t7700 256gb ssd. Yet the sproutcore demo does not freeze and takes less than 3 seconds to load. What do you think the one technique they are using to enable this is? Thanks!

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  • Two methods with different signatures, jquery is not calling correct method

    - by Lee
    There are two methods GetUserAssignedSystems() and GetUserAssignedSystems(string Id) These methods act very differently from each other. The problem is, when I want to call GetUserAssignedSystems(string Id), the parameter-less method is called. Here are the methods: [WebMethod] [ScriptMethod] public IEnumerable GetUserAssignedSystems(string cacId) { return Data.UserManager.GetUserAssingedSystems(cacId); } [WebMethod] [ScriptMethod] public IEnumerable GetUserAssignedSystems() { //do something else } Here is the jquery making the call: CallMfttService("ServiceLayer/UserManager.asmx/GetUserAssignedSystems", "{'cacId':'" + $('#EditUserCacId').val() + "'}", function(result) { for (var userSystem in result.d) { $('input[UserSystemID=' + result.d[userSystem] + ']').attr('checked', 'true'); } }); Any ideas why this method is being ignored?

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  • How to aviod sapcing from the first div of each row

    - by sandeep
    I have DIVs which comes side by side of each other & but there only fourth DIV comes in the first row & other are shifted too the next row. I want each row first div take no space from left side but is not happened. Here is my code http://jsfiddle.net/25pwG/ I know i can do it with giving class manual to the new row DIV but i didn't want that. i want this with less css & i didn't want to change my markup NOTE: i want capability till IE8. Thanks in advance :)

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  • Database migration

    - by graham.reeds
    We are migrating a client's own database schema to our own (both SQL-Server). Most of the mappings from their schema to ours have been indentified and rules been agreed on if the columns don't exactly align (default values etc.) Previously, depending on who was assigned the task, this has been done either with a mixture of sql scripts or one-off vb apps. I was thinking there must be a application (commercial or otherwise) where you can assign these mappings/rules and have it stream the data across. Surely the setting up and configuration of this tool would be less than the creation of ad-hoc scripts... Is there an app? Apart from the obvious 'be careful' any tips to mitigate the stress of a non-DBA porting one schema to another?

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  • IDisposable, does it really matter

    - by adrianm
    Coming from C/C++ a long time ago I still have a habit of ensuring that all resources are cleaned up correctly. I always ensure Dispose is called on IDisposable classes and implement Dispose patterns in my classes containing disposable objects. However, in my environment I'm more or less the only one doing this. Others just don't understand what I'm doing and think my code is more difficult to understand. They just create database connections, open streams etc without calling Close or Dispose. Sometimes they set a local or member variable to "Nothing" at the end of a method (guess their background). My problem is that their code works just as well as mine. Code that over time creates thousands of database connection objects just works. So, ignoring any arguments about code correctness, following guidelines etc, does IDiposable really matter? Has anyone actually ran out of resources from not Disposing objects?

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  • What would be my best MySQL Synchronization method?

    - by Kerry
    We're moving a social media service to be on separate data centers with global load balancing, as our other hosting provider's entire data center went down. Twice. This means that both websites need to be synchronized in some sense -- I'm less worried about the code of the pages, that's easy enough to sync, but they need to have the same database data. From my research on SO, it seems MySQL Replication is a good option, but the MySQL manual, for scaling out, says that its best when there are far more reads then there are writes/updates: http://dev.mysql.com/doc/refman/5.0/en/replication-solutions-scaleout.html In our case, it's about equal. We're getting around 200-300 thousand requests a day right now, and we can grow rapidly. Every request is both a read and write request. What would be the best method or tool to handle this?

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  • 2D Game: Fast(est) way to find x closest entities for another entity - huge amount of entities, high

    - by Pygmy
    I'm working on a 2D game that has a huge amount of dynamic entities. For fun's sake, let's call them soldiers, and let's say there are 50000 of them (which I just randomly thought up, it might be much more or much less :)). All these soldiers are moving every frame according to rules - think boids / flocking / steering behaviour. For each soldier, to update it's movement I need the X soldiers that are closest to the one I'm processing. What would be the best spatial hierarchy to store them to facilitate calculations like this without too much overhead ? (All entities are updated/moved every frame, so it has to handle dynamic entities very well)

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  • How do I get Xcode and TextMate to calibrate syntax highlighting colours the same way?

    - by Grant Heaslip
    This is a mostly insignificant problem, but it's been bugging me for a while and I figured someone on here might be as ridiculously OCD as I am (this is a programmer community after all). Basically, the problem is that TextMate doesn't seem to calibrate syntax highlighting colours, while Xcode does. What this means in practice is that, while I've faithfully recreated my TextMate theme in Xcode, the syntax highlighting in Xcode seems noticeably less vivid that it does in TextMate. If I use DigitalColor Meter to check the actual colours in Xcode, they don't match the values I entered, while in TextMate they do. Any ideas what's going on here? Thanks!

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  • C#. Struct design. Why 16 byte is recommended size?

    - by maxima120
    I read Cwalina book (recommendations on development and design of .NET apps). He says that good designed struct has to be less than 16 bytes in size (for performance purpose). My questions is - why exactly is this? And (more important) can I have larger struct with same efficiency if I run my .NET 3.5 (soon to be .NET 4.0) 64-bit application on i7 under Win7 x64 (is this limitation CPU / OS based)? Just to stress again - I need as efficient struct as it is possible. I try to keep it in stack all the time, the application is heavily multi-threaded and runs on sub-millisecond intervals, the current size of the struct is 64 byte.

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  • Find gap between start and end dates for multiple data ranges with overlaps

    - by sqlint
    Need to find gap between start and end dates more than 20 days for multiple data ranges with overlaps. One Id has multiple start dates and end dates. Following Id 1 has two gaps less that 20 day. It should be considered as one range from 10/01/2012 to 10/30/2014 without any gap. 1 10/01/2012 02/01/2013 1 01/01/2013 01/31/2013 1 02/10/2013 03/31/2013 1 04/15/2013 10/30/2014 Id 2 has a gap more than 20 days between end date 01/30/2013 and start date 05/01/2013. It has to be captured. 2 01/01/2013 01/30/2013 2 05/01/2013 06/30/2014 2 07/01/2013 02/01/2014 Id 3 should be considered as one range from 01/01/2012 to 06/01/2014 without any gap. The gap between end date 02/28/2013 and start date 07/01/2013 should be ignored because range from 01/01/2012 to 01/01/2014 cavers a gap. 3 01/01/2012 01/01/2014 3 01/01/2013 02/28/2013 3 07/01/2013 06/01/2014 The cursor can do it but it works extremely slow and not acceptable. SQL fiddle http://sqlfiddle.com/#!3/27e3f/2/0

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  • how to get a sub list from a list in ocaml

    - by romerun
    Hi, I'm looking at the List document. It seems the library does not provide a sublist function. I'm trying to get list of elements from i to j. Now I have to write it as: let rec sublist list i j = if i j then [] else (List.nth list i) :: (sublist list (i+1) j) which is quite concise but I'm questioning the efficiency of List.nth, because if it's O(n), I would rather have to write it in a less concise way. I'm wondering why didn't they provide List.sublist func, if List.nth is not O(1), because it's such a quite common operation..

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  • Linked List Inserting in sorted format

    - by user2738718
    package practise; public class Node { public int data; public Node next; public Node (int data, Node next) { this.data = data; this.next = next; } public int size (Node list) { int count = 0; while(list != null){ list = list.next; count++; } return count; } public static Node insert(Node head, int value) { Node T; if (head == null || head.data <= value) { T = new Node(value,head); return T; } else { head.next = insert(head.next, value); return head; } } } This work fine for all data values less than the first or the head. anything greater than than doesn't get added to the list.please explain in simple terms thanks.

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  • How to read system information in C++ on Windows and Linux?

    - by f4
    I need to read system information like CPU/RAM/disks usage in C++. Maybe swap, network and process too but that's less important. It has probably been done thousand of times before so I first tried to search for a library. Someone here suggested SIGAR, which seems to fit my needs but it has a GPL license and it is for inclusion in a proprietary product. So it's not an option here. I feel like it's something not that easy to implement, as it'll need testing on several platforms. So a library would be welcome. If you don't know of any library, could you point me in the right direction for both platforms?

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  • extension file "curl" is must be loaded

    - by Sharvan
    Using XAMPP 1.6.7 I installed the community version of Magento. But there seems to be a problem. I am getting the error message 'extension file "curl" is must be loaded'. In another computer, everything seems fine. (the other computer) intel(R) Pentium(R) Dual CPU, E2140 @ 1.60Hz, 1.60 GHz. 504 MB of RAM and XP professional 2002 sp2 My computer is less powerful (Inet Pentium 4 1.6 GHz. with sp2.) Please help me, thanks.

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  • Unsafe, super-fast cross-process memory buffer?

    - by John
    Cross-process memory buffers always have some overhead, and my understanding is this is quite high. But what if you're implementing a cross-process render-buffer, this isn't critically important in the same way as other data so are there techniques we can use to get 'raw' access to a chunk of memory from multiple processes, with no safety nets apart from it not crashing? Or do modern operating systems simply not work with unabstracted memory in a way to make this possible? I'm working in C++ but the question applies to Win XP/Vista/7, MacOSX 10.5+ (& Linux less importantly).

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  • Is It Worth Using Bitwise Operators In Methods?

    - by user1626141
    I am very new to Java (and programming in general, my previous experience is with ActionScript 2.0 and some simple JavaScript), and I am working my way slowly and methodically through Java: A Beginner's Guide by Herbert Schildt. It is an incredible book. For one thing, I finally understand more-or-less what bitwise operators (which I first encountered in ActionScript 2.0) do, and that they are more efficient than other methods for certain sums. My question is, is it more efficient to use a method that uses, say, a shift right, to perform all your divisions/2 (or divisions/even) for you in a large program with many calculations (in this case, a sprawling RPG), or is it more efficient to simply use standard mathematical operations because the compiler will optimise it all for you? Or, am I asking the wrong question entirely?

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  • Fortran - String with unknown characters into substrings

    - by Masoud
    I am trying to put an input string into sub-string arrays. The number of data in the input file are less than 10 but unknown. The number of spaces between each data is also unclear. Example: Asd B Cwqe21 Ddsw Eww I am quite novice to Fortran, so I do not know which format I should use. My problem is that I do not know the number of data (here I assumed that there are 5), so how can I make the code work? I tried the following which did not work: CHARACTER (LEN=100), DIMENSION(10) :: string READ (1,*) (string,I=1,10) It seems that the error I got was because there was no 6th string to read and put into string(6). I tried using the "Index" to find the space, but since I do not know how many spaces are in the string, it did not help me.

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  • What is the best way to do multiple listviews in android?

    - by Nicos
    Hi all, i am writing a software that i have to drill down on content a lot. For example when the program starts a listview is displayed. When user clicks on an item, then a second listview must be displayed. For example: Select Continent Select Country Select State Select City Select Address What is the best way to do this (less memory, faster, easier to code etc)? To create multiple listviews with multiple adapters? Or 1 listview with multiple Adapters? Lists are loaded from an external XML File. So far i am creating a new adapter and setting it to the listview. How do i create a second listview and after clicking on 1st listview displaying the second one, with animation. Any examples? Extend my class to ListActivity or Activity? Best regards and thanks for helping, Nicos

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  • C# Comparison shorthand

    - by TheAdamGaskins
    I have this code: if (y == a && y == b && y == c && y == d ...) { ... } Is there some form of shorthand so that I can rewrite it as something like this? if(y == (a && b && c && d ...)) { ... } The functionality should be exactly the same. I'm just looking for something that looks less confusing. EDIT Sorry for not clarifying, all the variables are integers. I'm looking for a shorter way to ensure that a, b, c, d, ... all equal y.

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  • C# Inconsistent Accessibility (Multiple Classes)

    - by MattP
    I am getting an Inconsistent Accessibility problem where I have one class that contains a List of another class namespace NS { public class Foo { public Foo() { this.bar = new List<Bar>(); } private List<Bar> bar; } public class Bar { public Bar() { } } } The error is property type NS.Bar is less accessible than property NS.Foo.Bar The structure to the application is each Foo consists of a Dynamic Array (List) of Bar. It's not ecommerce but the best example would be an eCommerce Store-Categories-Products in terms of how the data will be accessed.

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  • How do you add < or > to a summary tag in Visual studio?

    - by Tony
    How do you add < (less than) or (greater than) to a summary comment in visual studio? I am in Visual Studio 2008. I have a generic method: public bool IsMemberProtected<T>(Expression<Func<T, object>> expression) Would love to have a summary tag of something like this /// <summary> /// Determines whether a member is protected. /// /// Usage: IsMemberProtected<ExampleType>(x => x.Member) /// </summary> But when I do that, the tooltip for the property no longer works when a developer hovers over the method in code to view the summary tag. Thoughts?

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  • How to write a program that mimics Fiddler by using tcpdump or from scratch?

    - by ????
    When Fiddler is not on Mac OS X or Ubuntu, and if we don't install/use Wireshark or any other more heavy duty tools, what is a way to use tcpdump so that 1) It can print out GET /foo/bar HTTP/1.1 [request content in RAW text] [response content in RAW text] POST /foo/... HTTP/1.1 this should be able to be done by tcpdump or by using tcpdump in a short shell script or Ruby / Python / Perl script. 2) Actually, it can be neat if a script can output HTML, with GET /foo/bar HTTP/1.1 POST /foo/... HTTP/1.1 on the page, for any browser to display, and then when clicked on any of those lines, it will expand to show the RAW content like (1) above does. Click again and it will hide the details. The expansion UI can be done using jQuery or any JS library. The script may be short... possibly less than 20 lines? Does anybody know how to do it either for (1) or (2)?

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  • How can we protect ourselves from other third parties installing DLLs with the same names as some of

    - by Integer Poet
    Our product includes several DLLs built from open source into files with default names as delivered by the open source developers. We're careful to install the files in our own directories and we carefully manage the search path (only for our processes) to keep the loader happy. Another developer -- a towering intellect -- decided it would be easier to install their own build of some of the same open source into C:\WINDOWS under the same default DLL filenames. Consequently, when we launch a process which depends on these open source DLLs, the system searches C:\WINDOWS before our directories and finds the DLLs installed by the other developer. And they are, of course, incompatible. Ideas which have occurred to me so far: rename all our DLLs to avoid the default names, which would only make it less likely we would encounter collisions load all our DLLs by full path so the loader captures their names into RAM and doesn't search anywhere else the next time they are requested For various reasons, neither of these options is palatable at the moment. What else can we do to defend ourselves against the towering intellects of the world?

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