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• How does memory management in Java and C# differ?

  - by David Johnstone

  I was reading through 2010 CWE/SANS Top 25 Most Dangerous Programming Errors and one of the entries is for Buffer Copy without Checking Size of Input. It suggests using a language with features to prevent or mitigate this problem, and says: For example, many languages that perform their own memory management, such as Java and Perl, are not subject to buffer overflows. Other languages, such as Ada and C#, typically provide overflow protection, but the protection can be disabled by the programmer. I was not aware that Java and C# differed in any meaningful way with regard to memory management. How is it that Java is not subject to buffer overflows, while C# only protects against overflows? And how is it possible to disable this protection in C#?

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• Critiquing my first Python script

  - by tipu

  A little bit of background: I'm building an inverted index for a search engine. I was originally using PHP, but because of the amount of times I needed to write to disk, I wanted to make a threaded indexer. There's a problem with that because PHP is not thread safe. I then tried Java, but I ended up with at least 20 try catch blocks because of the JSON data structure I was using and working with files. The code was just too big and ugly. Then I figured I should pick up some Python because it's flexible like PHP but also thread safe. Though I'm open to all criticism, what I'd like to learn is the shortcuts that the Python language/library provides that I skipped over. This is a PHP-afide Python script because all I really did was translate the PHP script line by line to what I thought was it's Python equivalent. Thanks. http://pastebin.com/xrg7rf9w

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• Can I partition the C# System.Threading.ThreadPool?

  - by Drew Shafer

  I love ThreadPool. It makes my life better. However, my love may have quietly turned into an abusive relationship that I need to escape from, so I need some advice from my SO brothers (and presumably sisters, although I haven't seen any actual evidence of that yet). My basic problem is that I have several different libraries that are all using the threadpool in an uncoordinated way, and running out of threads is a possibility. I was hoping there was some way I could partition the ThreadPool up so I could give a certain class 1 thread, another 20 threads, another 5 threads, and so on. I know I could write my own ThreadPool implementation. I don't want to do that, because I'm lazy. So, is there a simple solution already out there? Currently I'm constrained to using the 3.5 CLR. I know a lot of this stuff becomes easier in 4.0.

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• How would you communicate with aliens as a computer scientist?

  - by Pyrolistical

  Let's say aliens arrive on Earth and instead of just sending mathematicians and linguistic experts governments around the work decide to send an expert of major field. After a quick round of sorting you are paired up with an alien computer scientist. Given you don't understand each others language how would you using computer science to start the ground work of communication? eg. We know binary is universal, but not the way we write it. The symbols are not universal nor is the the direction we write it (MSB vs LSB and left vs right) Assume aliens are "similar" to us physically it won't impede visual communication.

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• How to prevent a modal UIImagePickerController from rotating?

  - by coneybeare

  I have an app that fully support rotation. I am modally adding a UIImagePickerController for which there is no support for UIInterfaceOrientationLandscape and I cannot get the controller to stay in portrait. In other words, I need to disable rotation for the UIImagePickerController so it stays in portrait, without removing rotation for the rest of my app. this seems basic, but I can't seem to locate it. How can I prevent this rotation? UPDATE As suggested, I tried subclassing with the following code: @interface UAImagePickerController : UIImagePickerController { } @end @implementation UAImagePickerController - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation { return UIDeviceOrientationIsPortrait(toInterfaceOrientation); } @end The line is not being hit at all with a breakpoint… i think there must be something funky about the UIImagePickerView

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• UINavigationController (drawRect:)

  - by ludo

  Hi, I created an application with a TabBarController, 4 TabBarItems and every TabBarItem have is own NavigationController file (everything created in IB). I'm using the drawRect function to design my navigationBar: @implementation UINavigationBar (customImage) -(void)drawRect:(CGRect)rect { UIImage *image = [UIImage imageNamed:@"MyImage.png"]; [image drawInRect:CGRectMake(0,0, self.frame.size.width,self.frame.size.height)]; } @end The problem is that the NavigationBar change for every ViewController inside my app, what I want is only draw the NavigationBar for one TabBarItem only and use the default navigationBar for other controller. How to do that? Thanks,

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• "Expected specifier-quantifier-list before b2Body" error in XCode

  - by Zeophlite

  I'm trying to derive class from CCSprite to store the sprites reference to its corresponding b2Body, but I've get the following errors (comments in Code) BoxSprite.h #import <Foundation/Foundation.h> #import "Box2D.h" #import "cocos2d.h" @interface BoxSprite : CCSprite { b2Body* bod; // Expected specifier-quantifier-list before b2Body } @property (nonatomic, retain) b2Body* bod; // Expected specifier-quantifier-list before b2Body @end // Property 'bod' with 'retain' attribute must be of object type BoxSprite.m #import "BoxSprite.h" @implementation BoxSprite @synthesize bod; // No declaration of property 'bod' found in the interface - (void) dealloc { [bod release]; // 'bod' undeclared [super dealloc]; } @end I was hoping to create the sprite and assign the body with: BoxSprite *sprite = [BoxSprite spriteWithBatchNode:batch rect:CGRectMake(32 * idx,32 * idy,32,32)]; ... sprite->bod = body; // Instance variable 'bod' is declared protected Then access the b2Body by: if ([node isKindOfClass:[BoxSprite class]]) { BoxSprite *spr = (BoxSprite*)node; b2Body *body = spr->bod; // Instance variable 'bod' is declared protected ... }

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• iPhone development time...

  - by Tisch

  I have been asked to develop a relatively simple iPhone application. However, it would be my first application. I am a fairly competent programmer and can turn my skills to a new language fairly quickly... what my question is, is... How long has it taken some of you guys to make your first iPhone application and what was your experience like? Also, if you can say this sort of information, how much did you charge for it?! Thanks in advance. Kindest Regards Tom

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• WCF Service Library Reference in a Web Form (asp.net)

  - by Abu Hamzah

  i am not sure if this is the correct way of doing but i read that you not suppose to have a WCF Service Library reference in your web form project rather you add endpoints to your web.config, is that true? here is what i have done: 1) create a WCF service library project 2) create a simple service called "MyService.svc" WebForm: 1) Create a web project 2) create a WCF Service and in it i have this code <%@ ServiceHost Language="C#" Service="WCFJQuery.ContactBLL.Implementation.ContactUs" Factory="System.ServiceModel.Activation.WebScriptServiceHostFactory" %> 3) right click on the web proejct and "Add Reference" and add teh MyService.dll reference from WCF service library project. is this something how you suppose to do?

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• GDI fast scroll

  - by genesys

  Hi! I use GDI to create some custom textwidget. I draw directly to the screen, unbuffered. now i'd like to implement some fast scrolling, that simply pixelshifts the respective part of the framebuffer (and only redraws the newly visible lines). I noticed that for example the rich text controls does it like this. If i use some GDI drawing functions to directly draw to the framebuffer, over a rich text control, and then scroll the rich text, it will also scroll my drawing along with the text. so i assume the rich text simply pixelshifts it's part of the framebuffer. I'd like to do the same, but don't know how to do so. Can someone help? (independant of programming language)) thanks!

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• What container is easiest for combining JPEGS and MP3s as video?

  - by Ole Jak

  So I have N (for example, 1000) JPEG frames and 10*N ( for example, 100) seconds of MP3 sound. I need some container for joining them into one video file (at 10 frames/second) (popular containers like FLV or AVI or MOV are better). So what I need is an algorithm or code example of combining my data into some popular format. The code example should be in some language like C#, Java, ActionScript or PHP. The algorithm should be theoretically implementable with ActionScript or PHP. Can any one, please help me with that?

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• Overview of PHP shorthand

  - by James Simpson

  I've been programming in PHP for years now, but I've never learned how to use any shorthand. I come across it from time to time in code and have a hard time reading it, so I'd like to learn the different shorthand that exists for the language sot hat I can read it and start saving time/lines by using it, but I can't seem to find a comprehensive overview of all of the shorthand. A Google search pretty much exclusively shows the shorthand for if/else statements, but I know there must be more than just that. By shorthand, I am talking about stuff like: ($var) ? true : false;

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• Protect Plesk login page from search engine eyes

  - by Iman Samizadeh

  Hi Folks, I was wondering if would it be possible to protect the "https://www.DOMAIN.com:8443" URL from search engines listing perhaps using the htaccess to redirect the 8443 port from "DOMAIN" to elsewhere? This is the VZPP Plesk - Login Login to Plesk. Please enter your login information. Username. Password. Interface Language. User Default, ENGLISH (United States), GERMAN (Germany) ... https://www.DOMAIN.com:8443/ - Many Thanks.

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• Phantom updates due to decimal precision on calculated properties

  - by Jamie Ide

  This article describes my problem. I have several properties that are calculated. These are typed as decimal(9,2) in SQL Server and decimal in my C# classes. An example of the problem is: Object is loaded with a property value of 14.9 A calculation is performed and the property value is changed to 14.90393 When the session is flushed, NHibernate issues an update because the property is dirty Since the database field is decimal (9,2) the stored value doesn't change Basically a phantom update is issued every time this object is loaded. I don't want to truncate the calculations in my business objects because that tightly couples them to the database and I don't want to lose the precision in other calculations. I tried setting scale and precision or CustomType("Decimal(9,2)") in the mapping file but this appears to only affect schema generation. My only reasonable option appears to be creating an IUserType implementation to handle this. Is there a better solution?

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• How to get reference to SqlConnection (or Connection string) in Castle ActiveRecord?

  - by VoimiX

  how can I get reference to current SqlConnection or Sqlconnection in config? I found http://svn.castleproject.org:8080/svn/castle/trunk/ActiveRecord/Castle.ActiveRecord.Tests/DifferentDatabaseScopeTestCase.cs and code private string GetSqlConnection() { IConfigurationSource config = GetConfigSource(); IConfiguration db2 = config.GetConfiguration(typeof(ActiveRecordBase)); string conn = string.Empty; foreach (IConfiguration child in db2.Children) { if (child.Name == "connection.connection_string") { conn = child.Value; } } return conn; } But I cant understand where I can find "GetConfigSource" implementation? Is this standart Castle helper function or not? I use these namespaces using Castle.ActiveRecord; using NHibernate.Criterion; using NHibernate; using Castle.Core.Configuration; using Castle.ActiveRecord.Framework;

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• XCode project complains about missing files if a linked framework contains private headers

  - by darklight

  My Problem is this: My framework contains public and private headers - the public headers import private headers in the framework My app that links against this framework imports public headers Now when I compile it, XCode complains about missing files (the private headers that are indirectly imported via the frameworks public headers). I read somewhere on stackoverflow that I should do this: "In the public header file use @class to include other interfaces and use #import in the implementation file (.m)." I find this solution pretty unsatisfying - you have to use it for circular dependencies, too. Is there any better way to keep my headers private?

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• How to pass email from one form to another page's form with javascript

  - by zac

  I am trying to have an email signup form on one page populate the email block on another page by passing it through the url and pulling it out with document.write. The first form is something like: <form action="/sign-up"> <input type="text" name="passEmail"><input type="submit"></form> And the recieving form is like : <form name="theForm"> <input type='text' name='email'></form> And I am trying a script like this <SCRIPT LANGUAGE="javascript"> var locate = window.location document.theForm.email.value = locate var text = document.theForm.email.value function delineate(str) { theEmail = str.indexOf("=") + 1; return(str.substring(theEmail)); } document.write(delineate(text)); </SCRIPT> Instead of pulling the email after the = in the url it is pulling the entire url. Can someone help me accomplish this?

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• create a list of threads in C

  - by Hristo

  My implementation (in C) isn't working... the first node is always NULL so I can't free the memory. I'm doing: thread_node_t *thread_list_head = NULL; // done in the beginning of the program ... // later on in the program thread_node_t *thread = (thread_node_t*) malloc(sizeof(thread_node_t)); pthread_create(&(thread->thread), NULL, client_thread, &csFD); thread->next = thread_list_head; thread_list_head = thread; So when I try to free this memory, thread_list_head is NULL. while (thread_list_head != NULL) { thread_node_t *temp = thread_list_head; thread_list_head = thread_list_head->next; free(temp); temp = NULL; } Any advice on how to fix this or just a new way to create this list that would work better? Thanks, Hristo

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• Run Exchange Management Shell cmdlets from Visual Basic/C#/.NET app

  - by nowarninglabel

  Goal: Provide a web service using Visual Basic or C# or .NET that interacts with the Exchange Management Shell, sending it commands to run cmdlets, and return the results as XML. (Note that we could use any lanaguage to write the service, but since it is a Windows Box and we have Visual Studio 2008, it seemed like easiest solution would be just use it to create a VB/.NET web service. Indeed, it was quite easy to do so, just point and click.) Problem: How to run an Exchange Management Shell cmdlet from the web service, e.g, Get-DistributionGroupMember "Live Presidents" Seems that we should be able to create a PowerShell script that runs the cmdlet, and be able to call that from the command line, and thus just call it from within the program. Does this sound correct? If so how would I go about this? Thanks. Answer can be language agnostic, but Visual Basic would probably be best since that is what I loaded the test web service up in.

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• Target .Net Framework 4 in t4 templates

  - by HeavyWave

  We have a template that goes like this <#@ template language="C#v3.5" #> <#@ assembly name="System.dll" #> <#@ assembly name="System.Core.dll" #> <#@ assembly name="System.Data.Linq.dll" #> It compiles and runs on .Net 3.5, but after we have switched to .Net 4 the template has stopped working, so I've tried using answer from here, but I get errors like this Error 99 Compiling transformation: Metadata file 'System.Data.Linq.dll' could not be found How do I correctly modify the template to run on .Net Framework 4?

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• Recommendations for 'C' Project architecture guidelines?

  - by SiegeX

  Now that I got my head wrapped around the 'C' language to a point where I feel proficient enough to write clean code, I'd like to focus my attention on project architecture guidelines. I'm looking for a good resource that coves the following topics: How to create an interface that promotes code maintainability and is extensible for future upgrades. Library creation guidelines. Example, when should I consider using static vs dynamic libraries. How to properly design an ABI to cope with either one. Header files: what to partition out and when. Examples on when to use 1:1 vs 1:many .h to .c Anything you feel I missed but is important when attempting to architect a new C project. Ideally, I'd like to see some example projects ranging from small to large and see how the architecture changes depending on project size, function or customer. What resource(s) would you recommend for such topics?

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• Passing var from php to javascript

  - by marc-andre menard

  I try to do something pretty strait... getting php value to javascript here is the page here is the code.. <script language="javascript"> <?php $imagepath = $_REQUEST["path"]; ?> var whatisthepath = <?php $imagepath; ?> alert (whatisthepath); </script> ALWAYS getting UNDEFINE.... why ?

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• How to get accuracy memory usage on iphone device.

  - by Favo Yang

  I want to output accuracy memory usage on iphone device, the method I used was taking from, http://landonf.bikemonkey.org/code/iphone/Determining%5FAvailable%5FMemory.20081203.html natural_t mem_used = (vm_stat.active_count + vm_stat.inactive_count + vm_stat.wire_count) * pagesize; natural_t mem_free = vm_stat.free_count * pagesize; natural_t mem_total = mem_used + mem_free; The issue is that the total value is always changed after testing on device! used: 60200.0KB free: 2740.0KB total: 62940.0KB used: 53156.0KB free: 2524.0KB total: 55680.0KB used: 52500.0KB free: 2544.0KB total: 55044.0KB Have a look for the function implementation, it already sum active, inactive, wire and free pages, is there anything I missing here?

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• Trying to recognize _NSFaultingMutableSet as member of NSSet

  - by Will

  I'm trying to recognize the result of a generic query to a managed object as an NSSet. Currently the class returned is a member of _NSFaultingMutableSet, which is clearly related, but fails the isMemberOf:[NSSet class] and isKindOf:[NSSet class] calls. Given that Cocoa doesn't do a direct implementation of NSSet, it's not surprising that I've got some air in the pipes, but I'm wondering if I'm messing something obvious up or this requires a higher grade of kung-fu than I possess. Code follows: SEL selector = NSSelectorFromString(someString); if(![self respondsToSelector:selector]){ NSLog(@"Error processing item"); return; } id items = [self performSelector:selector]; Class itemsClass = [items class]; if ( [itemsClass isKindOfClass:[NSSet class]]) { // do something }

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• Using Interfaces in action signature

  - by Dmitry Borovsky

  Hello, I want to use interface in Action signature. So I've tried make own ModelBinder by deriving DefaultModelBinder: public class InterfaceBinder<T> : DefaultModelBinder where T: new() { protected override object CreateModel(ControllerContext controllerContext, ModelBindingContext bindingContext, Type modelType) { return base.CreateModel(controllerContext, bindingContext, typeof(T)); } } public interface IFoo { string Data { get; set; } } public class Foo: IFoo /*other interfaces*/ { /* a lot of */ public string Data { get; set; } } public class MegaController: Controller { public ActionResult Process( [ModelBinder(typeof(InterfaceBinder))]IFoo foo){/bla-bla-bla/} } But it doesn't work. Does anybody have idea how release this behaviour? And yes, I know that I can make my own implementation of IModelBinder, but I'm looking for easier way.

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