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  • Pair programming: How should the pairs be chosen?

    - by Jon Seigel
    This topic has been covered peripherally in bits and pieces in some of the other pair-programming questions, but I want to (a) consolidate this knowledge into a separate question, and, most importantly, (b) go into much more depth on the subject. From the perspective of being an effective manager, how should pairs be arranged for pair programming to maximize both the happiness and productivity of the overall team? Some ideas to get started: Should two people never be paired (because of personalities, for example)? How much overlap in skillsets is needed? How much disconnect in skillsets is too much to overcome? (No two people will overlap 100%, and a disconnect in skills can be very beneficial to both people.) Should everyone pair with everyone else on a fixed/rotating basis? Should certain pairs be arranged to accomplish specific tasks? How important a role does HR play when growing or reorganizing the team?

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  • WM_POWERBROADCAST handler for CMainDlg in ATL app not invoked

    - by psychotik
    I have an ATL app where I want to handle WM_POWERBROADCAST. I have a CMainDlg (CAxDialogImpl) in whose MSG_MAP I defined the handler. BEGIN_MSG_MAP(CMainDlg) ... MESSAGE_HANDLER(WM_POWERBROADCAST, OnPowerChange) ... END_MSG_MAP() However, the handler isn't invoked when I do things that should invoke it, for instance change power settings or put the machine to sleep. Any ideas about what might be going on, and how to fix this? Does CMainDlg not get notified of power events, for some reason?

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  • Objective-C NSMutableDictionary Disappearing

    - by blackmage
    I am having this problem with the NSMutableDictionary where the values are not coming up. Snippets from my code look like this: //Data into the Hash and then into an array yellowPages = [[NSMutableArray alloc] init]; NSMutableDictionary *address1=[[NSMutableDictionary alloc] init]; [address1 setObject:@"213 Pheasant CT" forKey: @"Street"]; [address1 setObject:@"NC" forKey: @"State"]; [address1 setObject:@"Wilmington" forKey: @"City"]; [address1 setObject:@"28403" forKey: @"Zip"]; [address1 setObject:@"Residential" forKey: @"Type"]; [yellowPages addObject:address1]; NSMutableDictionary *address2=[[NSMutableDictionary alloc] init]; [address1 setObject:@"812 Pheasant CT" forKey: @"Street"]; [address1 setObject:@"NC" forKey: @"State"]; [address1 setObject:@"Wilmington" forKey: @"City"]; [address1 setObject:@"28403" forKey: @"Zip"]; [address1 setObject:@"Residential" forKey: @"Type"]; [yellowPages addObject:address2]; //Iterate through array pulling the hash and insert into Location Object for(int i=0; i<locationCount; i++){ NSMutableDictionary *anAddress=[theAddresses getYellowPageAddressByIndex:i]; //Set Data Members Location *addressLocation=[[Location alloc] init]; addressLocation.Street=[anAddress objectForKey:@"Street"]; locations[i]=addressLocation; NSLog(addressLocation.Street); } So the problem is only the second address is printed, the 813 and I can't figure out why. Can anyone offer any help?

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  • .NET Framework installation requirements

    - by Paja
    What are the requirements for all .NET frameworks and their service packs? This is what I need to know for all available frameworks: .NET Framework prerequisites What other .NET Frameworks does it require? For example: .NET Framework 2.0 does not require anything, .NET Framework 2.0 SP1 requires .NET Framework 2.0 installed, but .NET Framework 3.5 SP1 does not require .NET Framework 3.5 installed (or maybe does? dunno) Reboot requirements Does the installation package require reboot after installation? Clean install requirements Does the installation package require clean install? (No pending delete/rename operations) Administrator privileges Does the installation package require administrator privileges to install? (I guess this is "yes" for all of them...) And I need to know all of this for the following packages: .NET Framework 1.1 .NET Framework 1.1 Language Pack .NET Framework 1.1 SP 1 .NET Framework 2.0 .NET Framework 2.0 Language Pack .NET Framework 2.0 SP 1 .NET Framework 2.0 SP 1 Language Pack .NET Framework 2.0 SP 2 .NET Framework 2.0 SP 2 Language Pack .NET Framework 3.5 .NET Framework 3.5 Language Pack .NET Framework 3.5 SP 1 .NET Framework 3.5 SP 1 Language Pack .NET Framework 4.0 Full .NET Framework 4.0 Client Could you please either tell me all of these requirements, or direct me to the appropriate source? Or maybe both? :-)

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  • Managing a difficult manager

    - by griegs
    I have a situation here at work. We are redeveloping our basic architecture across the entire company. Currently we have the following hierarchy; SQL Database <= Stored Procs not allowed. nHibernate Classes to convert nHibernate into our own objects Web Service <= for all external and [internal] calls. Class to take objects from Web Service and back into our own objects and then… Normal nTier application architecture such as Data Transformation Layer, Business layer etc. Within the database, when we are writing a hierarchy of objects to the database, say for example; Order Person Details Address Product Other We need to serialise the object and save it, in its entirety, to an image field in a table. No attempt has been made to store the objects in their own tables so that we can do useful stuff like report on it. This is an architecture that was implemented [way] before I started and as you can probably appreciate, is a complete nightmare not to mention slow as a wet weekend. We’re not even allowed to have stored procs within SQL server because in my boss’s last job they had a hundred or so and he had a problem identifying them all so therefore all stored procs are the devil. Now the same person that developed the above architecture has developed the new one. It came as no surprise that he’s essentially used the same framework only now it’s using DotNet 3.5 with interfaces and generics. We still have to go through web services, still need to serialise (everything), still not allowed to use stored procs etc. In fact, we’re only barely able to bang two rocks together here. He says to us that the framework is open for discussion but when you discuss it, unless you approve of his design, you are told flatly “No”. He simply won’t listen to any other suggestions. Even when you show him demo applications of his proposed architecture v’s yours and he can see the speed difference, he still won’t take that on board. So I guess my question is, and I know others have experienced the same things out there, how do I get through to someone like this? How do you convince someone to ditch Web Services for internal calls and applications? How do you demonstrate, and make it stick, that stored procs are a better way to go than ad-hoc sql statements? This is killing me. I don’t want to repeat the mistakes of the past and I certainly don’t want to write code that I know is going to be slow and cumbersome. Help!

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  • Why don't purely functional languages use reference counting?

    - by Zifre
    In purely functional languages, data is immutable. With reference counting, creating a reference cycle requires changing already created data. It seems like purely functional languages could use reference counting without worrying about the possibility of cycles. Am is right? If so, why don't they? I understand that reference counting is slower than GC in many cases, but at least it reduces pause times. It would be nice to have the option to use reference counting in cases where pause times are bad.

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  • Contributing to a Linux distribution

    - by Big Al
    I'm interested in contributing to a Linux distro, but regarding the various distro's developer communities, I'm having a bit of trouble figuring out which one I'd most like to join. What languages I know: C, C++, Lua, Python, and fairly familiar with Perl (though I wouldn't say I "know" it). In particular, I have very little experience with x86 assembly besides hacking stuff together for performance tweaks, though that will be partially rectified soon. What I'm looking for: A community that provides plenty of opportunities for developers to work on various aspects of the distribution. To be honest I'm most interested in reading and working on the kernel source (in which case the distro doesn't matter), but it's pretty daunting and I figure getting into the Linux community and working with experienced Linux developers might give me a better idea of how to jump into the guts(let me know if this is bogus, or if you have any advice regarding that). So... Which distro has the "best" developer community in terms of organization, people who are fun to work with, and opportunities to contribute? I've read various "Contributing to XXX" pages and mailing lists for distros like Ubuntu, OpenSuse, Fedora, etc. but I'd rather get a more personal testament from an actual developer.

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  • NSCFString Memory Leak

    - by Lakshmie
    Hello, I have been solving a lot of memory leaks but have been unsuccessful in solving this one. There are tons of NSCF memory leaks coming due to [NSCFString substringWithRange:]. I have been checking all the String allocations and have released all of them at appropriate places. The responsible library: Foundation. Has anyone encountered this problem before? Can anyone suggest me as how I should takle this issue? Thanks, Lakshmie

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  • Why is my addSubview: method causing a leak?

    - by Nathan
    Okay, so I have done a ton of research on this and have been pulling my hair out for days trying to figure out why the following code leaks: [UIApplication sharedApplication].networkActivityIndicatorVisible = YES; UIImage *comicImage = [self getCachedImage:[NSString stringWithFormat:@"%@%@%@",@"http://url/",comicNumber,@".png"]]; self.imageView = [[[UIImageView alloc] initWithImage:comicImage] autorelease]; [self.scrollView addSubview:self.imageView]; self.scrollView.contentSize = self.imageView.frame.size; self.imageWidth = [NSString stringWithFormat:@"%f",imageView.frame.size.width]; [UIApplication sharedApplication].networkActivityIndicatorVisible = NO; Both self.imageView and self.scrollView are @propety (nonatomic, retain) and released in my dealloc.. imageView isn't used anywhere else in the code. This code is also run in a thread off of the main thread. If I run this code on my device, it will quickly run out of memory if I continually load this view. However, I've found if I comment out the following line: [UIApplication sharedApplication].networkActivityIndicatorVisible = YES; UIImage *comicImage = [self getCachedImage:[NSString stringWithFormat:@"%@%@%@",@"http://url/",comicNumber,@".png"]]; self.imageView = [[[UIImageView alloc] initWithImage:comicImage] autorelease]; //[self.scrollView addSubview:self.imageView]; self.scrollView.contentSize = self.imageView.frame.size; self.imageWidth = [NSString stringWithFormat:@"%f",imageView.frame.size.width]; [UIApplication sharedApplication].networkActivityIndicatorVisible = NO; Memory usage becomes stable, no matter how many times I load the view. I have gone over everything I can think to see why this is leaking, but as far as I can tell I have all my releases straight. Can anyone see what I am missing?

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  • JRuby Slick CanvasGameContainer using too much heap memory

    - by Jwosty
    I'm using Java's Slick library (great, by the way) just fine from JRuby. To start a game, I use AppGameContainer which works completely fine and as expected, but if I try to use CanvasGameContainer instead (I want a resizable window and Slick uses an old version of LWJGL that doesn't support this directly) it throws this error: Fri Jun 01 10:22:07 MDT 2012 INFO:Slick Build #274 Error: Your application used more stack memory than the safety cap of 2048K. Specify -J-Xss####k to increase it (#### = cap size in KB). Specify -w for full StackOverflowError stack trace I've tried increasing the heap size until my computer can't allocate any more memory, but to no avail. The CanvasGameContainer uses an awt window to display, which is resizable. Any ideas on why this is happening and/or how to fix this?

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  • Exporting tasks to 'C using DPI

    - by Alphaneo
    I have an verilog based test-bench, interfaced to 'C source using DPI. Now using DPI I am planning to write my whole firmware. To do this I need 3 things Register Read Register Write Interrupt handler As I understand, register reads and writes are tasks that I need to export from the RTL test-bench. And Interrupt handler (I implemented by importing a function from 'C). I checked most the cadence documentation and found no useful hints. I have also registered with cadence users community but it seems that I cannot ask question till they approve my registration. Just in case someone is aware of this, would appreciate their help.

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  • Web.Routing for the site root or homepage

    - by Aquinas
    I am doing some work with Web.Routing, using it to have friendly urls and nice Rest like interfaces to a site that is essentially rendered by a single IHttpHandler. There are no webforms, the handler generates all the html/json and writes it as part of process request. This works well for things like /Sites/Accounting for example, but I can't get it to work for the site root, i.e. '/'. I have tried registering a route with an empty string, with 'default.aspx' (which is the empty aspx file I keep in my root folder to play nice with cassini and iis). I set RouteExistingFiles to false explicitly, but whatever I do when hitting the root url it still opens default.axpx, which has no code it inherits from, and contains a simple h1 tag to show that I've hit it. I don't want to change the default file to redirect to a desired route, I just want the equivalent of a 'default' route that is applied when no other routes are found, similar to MVC. For reference, the previous version of the site didn't use Web.Routing, but had a handler referenced in the web.config that was perfectly capable of intercepting requests for the root or default.aspx. Specs: ASP.NET 3.5sp1, C#, no webforms, MVC or openrasta. Plain old IHttpHandlers.

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  • How do you keep a balance between working, training, health and family?

    - by Jim Burger
    One trend I see in the awesome developers I've met, is that they devote inordinate amounts of time to coding at the expense of (usually) their health. Personally, I also find it hard to motivate myself to keep healthy. Every now and again, I meet a fantastic coder who has it clocked; they are up to date with the latest dev news, have time to read about good programming practices, and to finish it off, have happy wives/husbands and families. How do you guys/gals manage it in the short 24 hours a day that we all have?

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  • What sense does asynchronous IO make if the thread is blocked anyway (see example)

    - by codymanix
    Hello, I found an example for async ftp upload on msdn which does the following (snippet): // Asynchronously get the stream for the file contents. request.BeginGetRequestStream( new AsyncCallback (EndGetStreamCallback), state ); // Block the current thread until all operations are complete. waitObject.WaitOne(); The thing what I do not understand here is, which sense does asynchronous IO make if the thread is blocked anyway with an explicit waithandle. I always thought the advantage of asynchronous IO was that the user/programm does not have to wait.

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  • iPhone - UIImage imageScaledToSize Memory Issue

    - by bbullis21
    I have done research and tried several times to release the UIImage memory and have been unsuccessful. I saw one other post on the internet where someone else was having this same issue. Everytime imageScaledToSize is called, the ObjectAlloc continues to climb. In the following code I am pulling a local image from my resource directory and resizing it with some blur. Can someone provide some help on how to release the memory of the UIImages called....scaledImage and labelImage. This is the chunk of code where the iPhone Intruments has shown to have the ObjectAlloc build up. This chunk of code is called several times with an NSTimer. //Get local image from inside resource NSString * fileLocation = [[NSBundle mainBundle] pathForResource:imgMain ofType:@"jpg"]; NSData * imageData = [NSData dataWithContentsOfFile:fileLocation]; UIImage * blurMe = [UIImage imageWithData:imageData]; //Resize and blur image UIImage * scaledImage = [blurMe _imageScaledToSize:CGSizeMake(blurMe.size.width / dblBlurLevel, blurMe.size.width / dblBlurLevel) interpolationQuality:3.0]; UIImage * labelImage = [scaledImage _imageScaledToSize:blurMe.size interpolationQuality:3.0]; imgView.image = labelImage;

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  • Setting ivar in objective-c from child view in the iPhone

    - by Ivan
    Hi there! Maybe a FAQ at this website. I have a TableViewController that holds a form. In that form I have two fields (each in it's own cell): one to select who paid (single selection), and another to select people expense is paid for (multiple selection). Both fields open a new TableViewController included in an UINavigationController. Single select field (Paid By) holds an object Membership Multiple select field (Paid For) holds an object NSMutableArray Both vars are being sent to the new controller identically the same way: mySingleSelectController.crSelectedMember = self.crPaidByMember; myMultipleSelectController.crSelectedMembers = self.crSelectedMembers; From Paid for controller I use didSelectAtIndexPath method to set a mutable array of Memberships for whom is paid: if ([[tableView cellForRowAtIndexPath:indexPath] accessoryType] == UITableViewCellAccessoryCheckmark) { [self.crSelectedMembers removeObject:[self.crGroupMembers objectAtIndex:indexPath.row]]; //... } else { [self.crSelectedMembers addObject:[self.crGroupMembers objectAtIndex:indexPath.row]]; //... } So far everything goes well. An mutable array (crSelectedMembers) is perfectly set from child view. But... I have trouble setting Membership object. From Paid By controller I use didSelectAtIndexPath to set Membership: [self setCrSelectedMember:[crGroupMembers objectAtIndex:indexPath.row]]; By NSlogging crSelectedMember I get the right selected member in self, but in parent view, to which ivar is pointed, nothing is changed. Am I doing something wrong? Cause I CAN call the method of crSelectedMembers, but I can't change the value of crSelectedMember.

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  • Project planning, Note taking tool for developers

    - by iceangel89
    i am looking for a project planning tool that include features like a organizer, todo list, target * deadlines of projects. since i am a developer, it will be good to have a tool that can also do modelling like UML/ERD etc. i am also looking for something that can do note taking. something like a blog with code snipplets - so with syntax highlighting. OneNote etc all does not have code highlighting - the best i can do is use an online syntax highlighter to generate HTML then paste in which is slow. of course its good to have a free/open source tool that has all the features i listed. but its fine to know what paid options are there

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  • How do I solve an AntiForgeryToken exception that occurs after an iisreset in my ASP.Net MVC app?

    - by Colin Newell
    I’m having problems with the AntiForgeryToken in ASP.Net MVC. If I do an iisreset on my web server and a user continues with their session they get bounced to a login page. Not terrible but then the AntiForgery token blows up and the only way to get going again is to blow away the cookie on the browser. With the beta version of version 1 it used to go wrong when reading the cookie back in for me so I used to scrub it before asking for a validation token but that was fixed when it was released. For now I think I’ll roll back to my code that fixed the beta problem but I can’t help but think I’m missing something. Is there a simpler solution, heck should I just drop their helper and create a new one from scratch? I get the feeling that a lot of the problem is the fact that it’s tied so deeply into the old ASP.Net pipeline and is trying to kludge it into doing something it wasn’t really designed to do. I had a look in the source code for the ASP.Net MVC 2 RC and it doesn't look like the code has changed much so while I haven't tried it, I don't think there are any answers there. Here is the relevant part of the stack trace of the exception. Edit: I just realised I didn't mention that this is just trying to insert the token on the GET request. This isn't the validation that occurs when you do a POST kicking off. System.Web.Mvc.HttpAntiForgeryException: A required anti-forgery token was not supplied or was invalid. ---> System.Web.HttpException: Validation of viewstate MAC failed. If this application is hosted by a Web Farm or cluster, ensure that <machineKey> configuration specifies the same validationKey and validation algorithm. AutoGenerate cannot be used in a cluster. ---> System.Web.UI.ViewStateException: Invalid viewstate. Client IP: 127.0.0.1 Port: 4991 User-Agent: scrubbed ViewState: scrubbed Referer: blah Path: /oursite/Account/Login ---> System.Security.Cryptography.CryptographicException: Padding is invalid and cannot be removed. at System.Security.Cryptography.RijndaelManagedTransform.DecryptData(Byte[] inputBuffer, Int32 inputOffset, Int32 inputCount, Byte[]& outputBuffer, Int32 outputOffset, PaddingMode paddingMode, Boolean fLast) at System.Security.Cryptography.RijndaelManagedTransform.TransformFinalBlock(Byte[] inputBuffer, Int32 inputOffset, Int32 inputCount) at System.Security.Cryptography.CryptoStream.FlushFinalBlock() at System.Web.Configuration.MachineKeySection.EncryptOrDecryptData(Boolean fEncrypt, Byte[] buf, Byte[] modifier, Int32 start, Int32 length, IVType ivType, Boolean useValidationSymAlgo) at System.Web.UI.ObjectStateFormatter.Deserialize(String inputString) --- End of inner exception stack trace --- --- End of inner exception stack trace --- at System.Web.UI.ViewStateException.ThrowError(Exception inner, String persistedState, String errorPageMessage, Boolean macValidationError) at System.Web.UI.ViewStateException.ThrowMacValidationError(Exception inner, String persistedState) at System.Web.UI.ObjectStateFormatter.Deserialize(String inputString) at System.Web.UI.ObjectStateFormatter.System.Web.UI.IStateFormatter.Deserialize(String serializedState) at System.Web.Mvc.AntiForgeryDataSerializer.Deserialize(String serializedToken) --- End of inner exception stack trace --- at System.Web.Mvc.AntiForgeryDataSerializer.Deserialize(String serializedToken) at System.Web.Mvc.HtmlHelper.GetAntiForgeryTokenAndSetCookie(String salt, String domain, String path) at System.Web.Mvc.HtmlHelper.AntiForgeryToken(String salt, String domain, String path)

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  • How is dynamic memory allocation handled when extreme reliability is required?

    - by sharptooth
    Looks like dynamic memory allocation without garbage collection is a way to disaster. Dangling pointers there, memory leaks here. Very easy to plant an error that is sometimes hard to find and that has severe consequences. How are these problems addressed when mission-critical programs are written? I mean if I write a program that controls a spaceship like Voyager 1 that has to run for years and leave a smallest leak that leak can accumulate and halt the program sooner or later and when that happens it translates into epic fail. How is dynamic memory allocation handled when a program needs to be extremely reliable?

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  • Prevent Windows Explorer from interfering with Directory operations.

    - by Bruno Martinez
    Sometimes, no "foo" directory is left after running this code: string folder = Path.Combine(Path.GetTempPath(), "foo"); if (!Directory.Exists(folder)) Directory.CreateDirectory(folder); Process.Start(@"c:\windows\explorer.exe", folder); Thread.Sleep(TimeSpan.FromSeconds(5)); Directory.Delete(folder, false); Directory.CreateDirectory(folder); It seems Windows Explorer keeps a reference to the folder, so the last CreateDirectory has nothing to do, but then the original folder is deleted. How can I fix the code?

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  • IPhone custom UITableViewCell Reloading

    - by Steblo
    Hi, currently I'm struggling with this problem: I got a UITableViewController that displays a tableView with different custom cells. One custom cell displays a number (by a label). If you click on this cell, the navigationController moves to a UIPicker where the user can select the number to be displayes. If the user moves back, the cell should display the updated value. Problem: I managed to reload the cells by calling - (void)viewWillAppear:(BOOL)animated { [super viewWillAppear:animated]; [self.tableView reloadData]; } in the UITableViewController. This works only, if I don't use dequeueReusableCellWithIdentifier for the cell (tables won't show updates otherwise). But in this case, memory usage grows and grows... In addition, the program crashes after about 15 movements to pickerView and back - I think because the cell that should be reloaded is already released. How can I update a reusable custom cell every time the view appears ? What is the best solution ? I think retaining cells should not be used ?

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