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• Parsing plain Win32 PE File (Exe/DLL) in C#.NET

  - by Usman

  Hello, I need to parse plain Win32 DLL/Exe and need to get all imports and exports from it and to show it on console or GUI(say Win Forms). Is it possible to parse Win32 DLL/Exe in C#.NET, read its export table,import table and get managed types from it. As its unmanaged PE(.NET doesn't allows you to convert unmanaged PE files to managed .NET assemblies, only it generates COM managed assemblies). So how to parse export and import tables of PE files and take all methods(signatures from it) in managed form.(e.g if char* as argument, it should display as IntPtr) Regards Usman

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• What kind of knowledge you need to invent a new programming language?

  - by systempuntoout

  I just finished to read "coders at works", a brilliant book by Peter Seibel with 15 interviews to some of the most interesting computer programmers alive today. Well, many of the interviewees have (co)invented\implemented a new programming language. For example: * Joe Armstrong: Inventor of Erlang * L. Peter Deutsch: implementer of Smalltalk-80 * Brendan Eich: Inventor of JavaScript * Dan Ingalls: Smalltalk implementor and designer * Simon Peyton Jones: Coinventor of Haskell * Guy Steele: Coinventor of Scheme Is out of any doubt that their minds have something special and unreachable, and i'm not crazy to think i will ever able to create a new language; i'm just interested in this topic. So, imagine a funny\grotesque scenario where your crazy boss one day will come to your desk to say "i want a new programming language with my name on it..take the time you need and do it", what will you start to study? What kind of knowledge do you need to model, design and implement a brand new programming language?

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• Latent Dirichlet Allocation, pitfalls, tips and programs

  - by Gregg Lind

  I'm experimenting with Latent Dirichlet Allocation for topic disambiguation and assignment, and I'm looking for advice. Which program is the "best", where best is some combination of easiest to use, best prior estimation, fast How do I incorporate my intuitions about topicality. Let's say I think I know that some items in the corpus are really in the same category, like all articles by the same author. Can I add that into the analysis? Any unexpected pitfalls or tips I should know before embarking? I'd prefer is there are R or Python front ends for whatever program, but I expect (and accept) that I'll be dealing with C.

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• STM32 I2C1 Start bit not set on SR1 register

  - by jramirez

  Hi guys, I am trying to program the stm32 to talk to my i2c EEprom, but it seems like everytime I say: I2C_GenerateSTART(I2C1, ENABLE); while( !(I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT)) ); the code hangs here I went through with the debugger and I found that the SR1 bit 0 flag (which is the start bit generated flag) is not set which is why the code hangs. I can see in the oscilloscope that the start bit was generated and this works sometimes. it usually breaks when I tried to do several writes in a row. I checked the HW is everything looks fine I checked the frequency that I am running on the i2c bus it is 100Khz well within the 24lc1025 eeprom. any ideas, thanks

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• C# Object Creation from Datatable

  - by Jonesy

  Hi Folks, Im just getting my head round C#. I've been creating classes and objects so say i created a class called Member: public class Member { public int MemberID; public string FirstName; public string LastName; public string UserName; } and i create a new object of that class by doing this: Member Billy = new Member(); Billy.UserName = "Jonesy"; Billy.FirstName = "Billy"; Billy.LastName = "Jones"; Thats all fine but what if I've queried a database and gotten back 5 members, can I create objects on the fly? Or what is the best way to store these members in memory? I've used VB.Net where I would just add them into a datatable. But I've never really done any object-oriented programming before and thought since I'm learning C sharp nows the best time to learn OOP.. Any help most appreciated! Jonesy

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• Python if statement efficiency

  - by Dennis

  A friend (fellow low skill level recreational python scripter) asked me to look over some code. I noticed that he had 7 separate statements that basically said. if ( a and b and c): do something the statements a,b,c all tested their equality or lack of to set values. As I looked at it I found that because of the nature of the tests, I could re-write the whole logic block into 2 branches that never went more than 3 deep and rarely got past the first level (making the most rare occurrence test out first). if a: if b: if c: else: if c: else: if b: if c: else: if c: To me, logically it seems like it should be faster if you are making less, simpler tests that fail faster and move on. My real questions are 1) When I say if and else, should the if be true, does the else get completely ignored? 2) In theory would if (a and b and c) take as much time as the three separate if statements would?

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• Random value from Flags enum

  - by Chris Porter

  Say I have a function that accepts an enum decorated with the Flags attribute. If the value of the enum is a combination of more than one of the enum elements how can I extract one of those elements at random? I have the following but it seems there must be a better way. [Flags] enum Colours { Blue = 1, Red = 2, Green = 4 } public static void Main() { var options = Colours.Blue | Colours.Red | Colours.Green; var opts = options.ToString().Split(','); var rand = new Random(); var selected = opts[rand.Next(opts.Length)].Trim(); var myEnum = Enum.Parse(typeof(Colours), selected); Console.WriteLine(myEnum); Console.ReadLine(); }

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• LINQ-To-SQL and Many-To-Many Relationship Deletions

  - by Jake

  I have a many-to-many relationship between two tables, let's say Friends and Foods. If a friend likes a food I stick a row into the FriendsFoods table, like this: ID Friend Food 1 'Tom' 'Pizza' FriendsFoods has a Primary Key 'ID', and two non-null foreign keys 'Friend' and 'Food' to the 'Friends' and 'Foods' tables, respectively. Now suppose I have a Friend tom .NET object corresponding to 'Tom', and Tom no longer likes pizza (what is wrong with him?) FriendsFoods ff = tom.FriendsFoods.Where(x => x.Food.Name == 'Pizza').Single(); tom.FriendsFoods.Remove(ff); pizza.FriendsFoods.Remove(ff); If I try to SubmitChanges() on the DataContext, I get an exception because it attempts to insert a null into the Friend and Food columns in the FriendsFoods table. I'm sure I can put together some kind of convoluted logic to track changes to the FriendsFoods table, intercept SubmitChanges() calls, etc to try and get this to work the way I want, but is there a nice, clean way to remove a Many-To-Many relationship with LINQ-To-SQL?

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• Persisting details in Master Detail relation EF4 POCO

  - by Roger Alsing

  Scenario: Entity Framework 4 , POCO templates and Master Detail relation. Lets say I have a master type like this: //partial implementation of master entity partial class Master { public void AddDetail(x,y,z) { var detail = new Detail() { X = x, Y = y, Z = z, }; //add the detail to the master this.Details.Add(detail); } } If I then add a master instance to my context and commit, the details will not be saved: var masterObject = new Master(); masterObject.AddDetail(1,2,3); myContext.MasterSet.AddObject(masterObject); Is there any way to make the details to be persisted by reachabillity when using POCO templates? Or any other way? the Details collection in the Master entity is a FixUpCollection, so it ought to track the changes IMO. So, any ideas how to make this work W/O killing the POCO'ness too much?

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• mySQL date range problem

  - by StealthRT

  Hey all i am in need of a little help with figuring out how to get a range of days for my select query. Here is the code i am trying out: select id, idNumber, theDateStart, theDateEnd from clients WHERE idNumber = '010203' AND theDateStart >= '2010-04-09' AND theDateEnd <= '2010-04-09'; This is what the data in the table looks like: TheDateStart = 2010-04-09 TheDateEnd = 2010-04-11 When testing that code above, it does not populate anything. If i take out the TheEndDate, it populates but with some other tables data as well which it should not do (it should only get one record). I know the problem is within the two date's. I'm not sure how to go about getting a date range for theDateStart and theDateEnd since if someone tries it, say, on 2010-04-10, it still needs to know its within rage of the 2010-04-09 - 2010-04-11. But right now, it does not... Any help would be great! :o) David

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• ActiveXObject issue in javaScript

  - by shan.swf

  hi.. I wrote a javascript function in my html page to execute an .exe file. for this i used ActiveXObject. my function is: //~~~~~~~~~~~~~~~~~~~~~~~~~~~JavaScript~~~~~~~~~~~~~~~~ function openWin(url) { if (!document.all) { alert ("Available only with Internet Explorer."); return; } var ws = new ActiveXObject("WScript.Shell"); ws.Exec(url); } //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ It works fine but there is a alert "An ActiveX control might be unsafe to interact with other parts of the page. Do you want to allow this interaction?" comes up to confirm. If i say YES only it will get loaded. Pls anyone help me on this how to avoid this pop-up coming every time when i reload my html page.

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• Distributing points over a surface within boundries

  - by vise

  I'm interested in a way (algorithm) of distributing a predefined number of points over a 4 sided surface like a square. The main issue is that each point has got to have a minimum and maximum proximity to each other (random between two predefined values). Basically the distance of any two points should not be closer than let's say 2, and a further than 3. My code will be implemented in ruby (the points are locations, the surface is a map), but any ideas or snippets are definitely welcomed as all my ideas include a fair amount of brute force.

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• Handling database failover for Rails applications on FreeBSD

  - by bianster

  I'm working on implementing database (Postgresql) failover for a Rails app that runs with Passenger/FreeBSD. Due to certain constraints regarding the server OS, it's necessary to continue using FreeBSD (as opposed to say, Ubuntu). I'm finding it to be quite a challenge to have failover handled within the Rails application, by way of a customised database adapter due to the fact that this application will be load-balanced between several webservers, and the multiple Rails processes that Passenger spawned in each webserver. I previously looked at setting up Pacemaker/Corosync to manage database server failover on a common IP but unfortunately I wasn't able to get past building the packages on FreeBSD. It does work rather well on Ubuntu 10.04 but I'm not likely to be able to use Ubuntu due to the OS constraints. I'm considering a custom witness daemon that simply pings the primary DB server, and this witness daemon switches all the webservers to the standby DB server when the primary becomes uncontactable (permanently/temporarily), to avoid split-brain. Though I would really like to know if there is a way to get Pacemaker(or something similar) to do the switch on FreeBSD.

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• Algorithm for digit summing?

  - by Joe

  I'm searching for an algorithm for Digit summing. Let me outline the basic principle: Say you have a number: 18268. 1 + 8 + 2 + 6 + 8 = 25 2 + 5 = 7 And 7 is our final number. It's basically adding each number of the whole number until we get down to a single (also known as a 'core') digit. It's often used by numerologists. I'm searching for an algorithm (doesn't have to be language in-specific) for this. I have searched Google for the last hour with terms such as digit sum algorithm and whatnot but got no suitable results. Any help would be great, thanks.

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• Python: slicing a very large binary file

  - by Duncan Tait

  Say I have a binary file of 12GB and I want to slice 8GB out of the middle of it. I know the position indices I want to cut between. How do I do this? Obviously 12GB won't fit into memory, that's fine, but 8GB won't either... Which I thought was fine, but it appears binary doesn't seem to like it if you do it in chunks! I was appending 10MB at a time to a new binary file and there are discontinuities on the edges of each 10MB chunk in the new file. Is there a Pythonic way of doing this easily?

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• Intersection point in silverlight/wpf

  - by Andrei Neagu

  Hello, Given a path like this one : <Path Stretch="Fill" Stroke="#FFD69436" Data="M 0,20 L 22.3,20 L 34,0 L 44.7,20 L 68,20 L 55.8,40 L 68,60 L 44.7,60 L 34,80 L 22.3,60 L 0,60 L 11.16,40 L 0,20 Z"> <Path.Fill> <LinearGradientBrush StartPoint="0,0" EndPoint="0,1"> <LinearGradientBrush.GradientStops> <GradientStop Color="#FFFFFF" Offset="0" /> <GradientStop Color="Orange" Offset="1" /> </LinearGradientBrush.GradientStops> </LinearGradientBrush> </Path.Fill> </Path> How can I get the point that is at the edge of this figure at any angle? Lets say that I want the intersection point between the edge of this figure and a line passing through the center of this figure, at the 30 degrees angle with the OX axe? thanks.

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• referencing an instantiated object in another class in objective C

  - by Paul

  hi, I am working in xcode on an ipod app in objective C, and I have a field (navigationController) in one of my classes (rootViewController). How do I reference the instantiated rootViewController's navigationController from another class? For example, how would I do this if I want to reference the navigationController from the FirstViewController.m class? I seem to only be able to find references for this to reference the application delegate. If I want to reference the application delegate with FirstViewController, I just say: MyAppDelegate *delegate = [[UIApplication sharedApplication] delegate]; [delegate.navigationController pushViewController:childController animated:YES]; how do I do this for the rootViewController class instead of MyAppDelegate?

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• Create Task Report from Mylyn?

  - by luis.espinal

  Hello all - is there a way to create a task/activity report (say a weekly report) off tasks managed with Mylyn? I've been using Rachota TimeTracker which allows me to create reports (in html format) http://rachota.sourceforge.net/en/demo.html I've just started using mylyn (our company uses Embarcadero JBuilder which is is based on Eclipse), but I don't see anywhere in the Eclipse or Embarcadero docs about reporting capabilities. Is it possible? Is it possible to query activities worked on a prior week and report statistics out of it (management like reports, you know;) I'm sure it is, but I haven't been able to google it out. Thanks.

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• Advantages of Thread pooling in embedded systems

  - by Microkernel

  I am looking at the advantages of threadpooling design pattern in Embedded systems. I have listed few advantages, please go through them, comment and please suggest any other possible advantages that I am missing. Scalability in systems like ucos-2 where there is limit on number of threads. Increasing capability of any task when necessary like Garbage collection (say in normal systems if garbage collection is running under one task, its not possible to speed it up, but in threadpooling we can easily speed it up). Can set limit on the max system load. Please suggest if I am missing anything.

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• Architecture of an image hosting site

  - by kamziro

  I'm sure many here are aware of image hosting sites, like imgur, min.us, photobucket etc. Not that I want to develop one, but besides just uploading the file, organising it in some directory somewhere, what architectural considerations are involved in these sites? Especially when there's millions of page views a day (like imgur, I'd imagine) I'm curious about this because it seems that a lot of sites (say, dating websites etc) would be pretty image intensive. Even if it's not for millions of page views, what are some basic architectural requirements of efficient image deliveries online?

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• Throwing exceptions as well as catching exceptions?

  - by Eric S

  I was wondering how Java takes the following scenario public static void main(String[] args) throws IndexOutOfBoundsException, CoordinateException, MissionException, SQLException, ParserConfigurationException { try { doSomething(); } catch (Exception e) { e.printStackTrace(); } } In the above code, I am declaring the main function to throw many different exceptions, but inside the function, I am catching the generic Exception. I am wondering how java takes this internally? I.e., say doSomething() throws an IndexOutOfBounds exception, will the e.printStackTrace() get called in the last catch (Exception e) {...} block? I know if an exception not declared in the throws area of the function gets thrown, the try/catch will handle it, but what about exceptions mentioned in the declaration?

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• Embed a Python persistance layer into a C++ application - good idea?

  - by Rickard

  say I'm about to write an application with a thin GUI layer, a really fat calculation layer (doing computationally heavy calibrations and other long-running stuff) and fairly simple persistance layer. I'm looking at building the GUI + calculation layer in C++ (using Qt for the gui parts). Now - would it be a crazy idea to build the persistance layer in Python, using sqlalchemy, and embed it into the C++ application, letting the layers interface with eachother through lightweigth data transfer objects (written in C++ but accessible from python)? (the other alternative I'm leaning towards would probably be to write the app in Python from the start, using the PyQt wrapper, and then calling into C++ for the computational tasks) Thanks, Rickard

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• Book Recommendation: Web Design

  - by injekt

  I'm looking to get back into advanced Web Design. I'd say I was already fairly advanced but I haven't designed much in a good few years and haven't got any books any more. I was just interested to know if anyone had any good recommendations for Web Design books and resources, I've spent the last couple of days looking around but can't make my mind up. Any contributions are greatly appreciated. PS. I have looked around at other questions on StackOverflow that could be related, but couldn't find any that fitted.

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• How does the linux kernel manage less than 1GB physical memory ?

  - by TheLoneJoker

  I'm learning the linux kernel internals and while reading "Understanding Linux Kernel", quite a few memory related questions struck me. One of them is, how the Linux kernel handles the memory mapping if the physical memory of say only 512 MB is installed on my system. As I read, kernel maps 0(or 16) MB-896MB physical RAM into 0xC0000000 linear address and can directly address it. So, in the above described case where I only have 512 MB: How can the kernel map 896 MB from only 512 MB ? What about user mode processes in this situation? Where are user mode processes in phys RAM? Every article explains only the situation, when you've installed 4 GB of memory and the kernel maps the 1 GB into kernel space and user processes uses the remaining amount of RAM. I would appreciate any help in improving my understanding. Thanks..!

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• Are SOLID principles really solid?

  - by Arseny

  The first pattern stands for this acronym is SRP. Here is a quote. the single responsibility principle states that every object should have a single responsibility, and that responsibility should be entirely encapsulated by the class. That's is simple and clear till we start to code ) Suppose we have a class with well defined SRP. To serialize this class instances we need to add special atrributes to that class. So now the class have other responsibility. Dosen't it violate SRP? Let's see other story. Interface implementation. Then we implement an interface we simply add other responsibility say dispose its resorces or compare its instances or whatever. So my question. Is it possible to keep SRP complete? How can we do it?

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