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• Saving core data in a thread, how to ensure its done writing before quitting?

  - by Shizam

  So I'm saving small images to core data which take a really short amount of time to save, like .2 seconds but I'm doing it while the user is flipping through a scroll view so in order to improve responsiveness I'm moving the saving to a thread. This works great, everything gets saved and the app is responsive. However, there is one thing in the core-data + multithreading doco that worries me: "In Cocoa, only the main thread is not-detached. If you need to save on other threads, you must write additional code such that the main thread prevents the application from quitting until all the save operation is complete." Ok, how do you do that? It only needs to last ~ .2 seconds and its rarely going to happen since the chance of the app quitting as something is saving is very low. How do I run something on the main thread that'll prevent the app from quitting AND not block the gui? Thanks

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• Obj C - how to customise the interval between slides with IKSlideShow

  - by doraemon

  I'm very new to Objective-C and Cocoa but I've made a simple app which uses ImageKit to present a slideshow using the IKSlideShow class. However I've got a bit stuck with something I thought would be simple. I want to increase the time photos are displayed on screen when the slideshow is playing, but I can't see how to do it effectively. The IKSlideshowDatasource protocol lets you do stuff when "slideshowDidChangeCurrentIndex" which seems to be the best place to do this - however I've tried putting various delays in here such as: while ( functionShouldPause ) { [[NSRunLoop currentRunLoop] runUntilDate:[NSDate dateWithTimeIntervalSinceNow:20]]; functionShouldPause=NO; } However they prevent the user for manually moving on the slides, or leaving the slideshow. Very grateful for any suggestions. Thanks!

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• Start developing for macosx

  - by Stefano Borini

  hello, I would like to start developing for macosx. I need to create a small native application to help me do some stuff. I never developed in Objective-C, have no idea about cocoa, Xcode, NIB and similar stuff. I don't want to learn by slapping examples together though. This would probably make things done, but I would not learn anything. I'd prefer a guided tutorial (or book) to go from zero to release on the web of the application. Do you have anything to suggest ?

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• Apple Mac Software Development

  - by MattMorgs

  I'm planning on developing an Apple Mac application which will collect hardware information from the host Mac and also installed software info. The hardware and software info will be collected in an encrypted XML file and then posted back to a website. The application should run as a "service" or background process on the Mac and can be configured to collect the data on a frequent basis defined by another encrypted XML config file. I've done plenty of Windows based software development but never on the Mac. Can anybody point me in the direction of any useful info on how to develop on the Mac, collect hardware and software info, export to an XML file, file encryption and packaging a compiled app to run as a service? Is either Objective C, Cocoa or Ruby a possible option? Many thanks for your help in advance!

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• iPhone: Try to send html code to a php script (but fail)

  - by Marc-André Weibezahn

  Hello all, I am trying this for an iPhone app in Xcode: create html code for a website on the fly sending it to a php-script and getting the response with this code: NSError * error = [[[NSError alloc]init]autorelease]; NSURL * phpURL = [NSURL URLWithString: @"http://www.mydomain.com/myscript.php?mywebsite= (...websitestring...) ];NSString * myResponse = [NSString stringWithContentsOfURL:phpURL encoding:NSUTF8StringEncoding error:&error]; It does not work. It should not be a problem of the php code because when I replace the websitestring which contains the html code with "hello" or something, this is accepted. (the script then creates a file "test.html" with the content I sent.) But when I put html code in it, I always get the error: Error Domain=NSCocoaErrorDomain Code=256 "The operation couldn’t be completed. (Cocoa error 256.)" UserInfo=0x322ec10 {} It seems that there are some things to consider when sending code to php? Thanks in advance!

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• from JS to iphone dev - what's the best language to start with?

  - by Enkai

  I am a total beginner and would like to eventually learn to develop for the iphone. I have just done a beginner's CS course where the language we learned was JavaScript. We studied basic concepts like: variables, arrays, loops (for,while,if,if..else..), properties and functions. I'm wondering if I am starting in the right/wrong place by following this book: Learn C on the Mac by Dave Mark? I have read a few chapters and am finding it a bit hard to get my head around the way that C works, for example the way that Strings are printed seems overly complicated as compared to JS. Do you think that JS was the wrong language to start off with and would I be better to go from JS straight to Objective-C rather than to C? I have tried to read up on previous threads on the merits/demerits of learning C first but haven't found any that relate JS to learning C/Obj C/ Cocoa. Any advice appreciated as I am very new to this. Thanks

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• How should I get Xcode to link an iOS project that uses a C++ static library

  - by user1681572

  Using Xcode, I've written a Cocoa Touch static library, mainly in C++. It exposes a C interface for the benefit of Objective-C client code. I have a client iOS app that uses it, and everything works and runs as expected, except that I found I needed to include a minimal .cpp file in the client project to get the link to succeed. Otherwise I get C++-related unresolved symbols, e.g. operator new(unsigned long). The above hack is easy and effective, and so I guess I'm not breaking any laws, but is there a proper way to eliminate my linker errors?

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• Cross platform, Interactive text-based interface with command completion

  - by trojanfoe

  Does anyone know of a C++ library that will provide a text-based interactive interface? I want to create two versions of an application; a console based program that will perform whatever actions are given on the command line or interactively at the console as well as a GUI based program (Mac Cocoa and Windows MFC). Both versions will share a common C++ backend. For the console based program I would like similar history abilities to readline (which I cannot use as this application will be closed source) with command completion (Tab-activated for example). Perhaps there is something like this already available?

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• Object initialization sequence in Objective-C

  - by Alex

  Hello everyone. The Cocoa framework has a convention to always call self = [super init] in the init method of an inherited class, because [super init] may return a new instance. What will happen if I do this? @interface MyClass : NSObject /* or any other class */ { int ivar_; } @end @implementation MyClass - (id)init { ivar_ = 12345; if ((self = [super init])) { NSLog(@"ivar_'s value is %d", ivar_); } return self; } @end In the case when [super init] returns a new instance, what will I see in the console? ivar_'s value is 0? I can't think of a way to check this myself, because I don't know which class may return a new instance from its init method. Also, can't seem to find explicit clarification for this scenario in the docs. Could anyone help me out? Thanks!

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• Sharing Code, Images and Core Data models across iPhone and Mac project

  - by Robert

  Hi, I am maintaining a fairly large mac project and an iphone client for this project. Some code as well as some images and core data models are shared between these two projects. I want to create a shared framework containing this shared components but to my surprise, frameworks like we cocoa developers known them are not supported on the iphone os. Currently I see the following options: a) Include the files in both projects (much tedious work) b) Create a static library for both projects and manually copying the images/core data models c) Create a static lib for iphone and a framework for mac Any suggestions?

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• Starting out with Objective C; need some guidance

  - by alimaxwell

  Hi Everyone, I have started learning Objective C with no prior programming experience from the 'Become an X-Coder' eBook (http://download.cocoalab.com.s3.amazonaws.com/BecomeAnXcoder.pdf). My question is, if I want to be doing iPhone development, am I going in the right direction? Am I learning the wrong language, or should I be learning Cocoa Touch? As I said, I have no prior experience, and just need someone to point me in the right direction. Apoligies if I have put this in the wrong place. Thanks very much for your time.

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• Using MVP, how to create a view from another view, linked with the same model object

  - by Dinaiz

  Background We use the Model-View-Presenter design pattern along with the abstract factory pattern and the "signal/slot" pattern in our application, to fullfill 2 main requirements Enhance testability (very lightweight GUI, every action can be simulated in unit tests) Make the "view" totally independant from the rest, so we can change the actual view implementation, without changing anything else In order to do so our code is divided in 4 layers : Core : which holds the model Presenter : which manages interactions between the view interfaces (see bellow) and the core View Interfaces : they define the signals and slots for a View, but not the implementation Views : the actual implementation of the views When the presenter creates or deals with views, it uses an abstract factory and only knows about the view interfaces. It does the signal/slot binding between views interfaces. It doesn't care about the actual implementation. In the "views" layer, we have a concrete factory which deals with implementations. The signal/slot mechanism is implemented using a custom framework built upon boost::function. Really, what we have is something like that : http://martinfowler.com/eaaDev/PassiveScreen.html Everything works fine. The problem However, there's a problem I don't know how to solve. Let's take for example a very simple drag and drop example. I have two ContainersViews (ContainerView1, ContainerView2). ContainerView1 has an ItemView1. I drag the ItemView1 from ContainerView1 to ContainerView2. ContainerView2 must create an ItemView2, of a different type, but which "points" to the same model object as ItemView1. So the ContainerView2 gets a callback called for the drop action with ItemView1 as a parameter. It calls ContainerPresenterB passing it ItemViewB In this case we are only dealing with views. In MVP-PV, views aren't supposed to know anything about the presenter nor the model, right ? How can I create the ItemView2 from the ItemView1, not knowing which model object is ItemView1 representing ? I thought about adding an "itemId" to every view, this id being the id of the core object the view represents. So in pseudo code, ContainerPresenter2 would do something like itemView2=abstractWidgetFactory.createItemView2(); this.add(itemView2,itemView1.getCoreObjectId()) I don't get too much into details. That just work. The problem I have here is that those itemIds are just like pointers. And pointers can be dangling. Imagine that by mistake, I delete itemView1, and this deletes coreObject1. The itemView2 will have a coreObjectId which represents an invalid coreObject. Isn't there a more elegant and "bulletproof" solution ? Even though I never did ObjectiveC or macOSX programming, I couldn't help but notice that our framework is very similar to Cocoa framework. How do they deal with this kind of problem ? Couldn't find more in-depth information about that on google. If someone could shed some light on this. I hope this question isn't too confusing ...

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• Looking for tips on managing complexity with SCM repositories

  - by Philip Regan

  I am a solo developer in my department and I have a lot of individual projects, all created and managed by me. I started using SVN at ProjectLocker via Versions on the Mac a couple years ago when the variety of projects started getting unwieldy. Scenario 1: Now I have a process that is of reasonable complexity it can be broken up into multiple smaller applications and they all share files. In one phase, there is a single shared file—a constants file—that is shared between a Cocoa app and an iPhone app framework. In the second phase, the iPhone app framework will be used to create individual apps of the same ilk—controller classes and what not will all be the same—but with different content in each. The problem that I am running across is that the file in the first phase is in one repository with the application that started it, and the app framework is in a second, separate repository. Scenario 2: I have another application framework that partially relies on code from an open source project. This is all internal, non-commerical work, but again, the application framework is going to be used to create a variety of unique products and processes. So, now I have an internally managed repository and an externally managed one out of my control. I make little changes to the open source code to meet the needs of my framework when there is an update I download, but I never commit back into the external repository (though, now that I think about it, I don't think I'm committing it to mine either. Oops). The Problem I have all of this set up on my production Mac quite nicely, but duplicating and subsequently maintaining that environment on my laptop has been challenging. For Scenario 1, I've thought of merging these two projects together into the same repository because they are, for all intents and purposes inextricably linked. But, Scenario 2, I think I'm stuck just managing files as best I can. The Question I'm wondering if anyone has any tips on how to manage either of these situations, as well as other complex SCM scenarios when it comes to linking various files from various repositories together. My familiarity with SVN only comes from my work with Versions. It's been great, but I'm a little out of my depth here.

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• powershell: use variable with wildcard with get-aduser

  - by user179037

  powershell newbie here. I am building a simple bit of code to help me find user's by entering letters of user names. How do I get a wildcard to work w/ a variable? this works: $name=read-host -prompt "enter user's first or last initial" $userInput=get-aduser -f {givenname -like 'A*' } cmd /c echo "output: $userInput" this does not: $name=read-host -prompt "enter user's first or last initial" $userInput=get-aduser -f {givenname -like '$name*' } cmd /c echo "output: $userInput" The first bit of code delivers a list of users with "A" in their name. Any suggestions woudl be appreciated. thanks

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• Office 2013 OCT unhandled exception when saving .RSP

  - by user52874

  I'm trying to prepare a deployment of office 2013 pro plus. If I deploy an existing .rsp file that was left behind by the old analyst (typing from the client): PS C: \\deploybox\software\Office2013\setup.exe /adminfile \\deploybox\software\Office2013\SWKS.MSP Things seem to deploy just fine. if I make any changes to the .rsp file by doing (all from the client): PS C: \\deploybox\software\Office2013\setup.exe /admin * Open SWKS.MSP * Make changes * Save under a different name SWKS1.MSP I get the following errorbox: Unhandled Exception: MsiGetSummaryInformation call failed. And if I try to deploy the new SWKS1.MSP, PS C: \\deploybox\software\Office2013\setup.exe /adminfile \\deploybox\software\Office2013\SWKS1.MSP it fails with the message: Path or file specified with /adminfile did not contain any customization patches that apply to this product or platform. If I even open the old known good .rsp file SWKS.MSP, and immediately save it as a new name SWKS1.MSP, making no changes, then the same thing happens. So what stupid newbie mistake am I making here? Thanks!

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• Where can I ask questions that aren't IT questions?

  - by Adam Davis

  Thank you for your confidence in our abilities But have you read this? FAQ We get a lot of interesting technical questions on here, but Server Fault is meant to be first and foremost a resource for system administrators and IT professionals. In other words, Server Fault isn't meant to cater to every computer problem - just those that only exist in or can best be solved in the IT and sysadmin domain Yes, someone here might be able to help you, but you'll find that other forums more focused on your topic can give you a much better answer than a bunch of IT professionals. It's likely that your question will be downvoted, closed, and in some cases marked "offensive." It's not that we hate you, it's just that we like to keep our corn pops separate from our cocoa puffs. In that vein, here are a bunch of other forums where you can get help: (This list contains the top two forums for each category as voted for below.) Programming Stackoverflow Consumer Level Computer Hardware Ars Technica OpenForum Tom's Hardware Forums Computer Software Anandtech Forum Web Design/Hosting/CMS SitePoint Forums Web Hosting Talk Math, Science, Engineering Physics Forums PlanetMath Other/General Ask Metafilter Google Search Mahalo Answers Check out the answers below for even more suggestions! What forums can people go to to ask the questions that are off topic here? Please list only ONE forum per answer so votes can bring the best forums to the top. Return to FAQ Index

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• How to use X11 forwarding with putty

  - by Neuquino

  I have a VM with RHEL 5 without an X server. My host has Windows 7. I need to connect to the VM and redirect the X11 output of the commands to my host. I know that if my host were a GNU/Linux machine it would be as easy as ssh -X . I'm ussing PuTTy to connect by SSH to the VM, I tried enabling X11 forward option in PuTTy config, but nothing happened. Have you ever done this? I'm quite advanced with GNU/Linux, but a newbie with this toy of Winbug$ 7.

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• How to set up a SSH tunnel and/or reverse SSH tunnel?

  - by bossytoe

  I'm located in Shanghai China and am trying to set up an SSH tunnel (or a reverse ssh tunnel?) to my brother's server located in the States. I'm using windows xp and he has a mac. We are both using wireless routers (not sure if this is relevant). He's given me the address and password (for his server, I think), and I've downloaded myentunnel (which he recommended), but am not sure what to do now. I've also downloaded the foxyproxy add-on for mozilla (my preferred browser), and am hoping there is someone out there who can help guide a newbie like me! Thanks in advance.

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• many partitions on a single filegroup?¿ does it make sense?

  - by river0

  Hi, I'm designing a datawarehouse solution and I'm a newbie in disk configuration issues, let me explain you. Our storage is spread over 6 storage enlosures having each of them 5 raid-1 disk arrays, and having 2 LUNS defined per each disk array, which makes a total 48 LUNS (this is following Microsoft fast track recommendations for datawarehouse architectures). I would like to partition my data, on other projects I have worked before, we always followed a 1 partition - 1 filegroup rule. On the microsoft fast track recomendations it is advised to create a filegroup and then for that filegroup a data file per each lun... but I pretend to have a week level partitioning... if I apply that rule I think that I'll get too many files and a complex layout. I'm thinking of just creating just one filegroup (with the 48 lun data files), but still create the partitions since I want to keep soem of the benefits of partitions like partition switching... Is this scenario not recommended? What would you suggest?

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• Is MySQL better than PostgreSQL in something?

  - by Massimiliano Torromeo

  I know the question sounds provocative but it really isn't. I'm lately finding MySQL limiting in a lot of areas and liking PostgreSQL more and more. It scales a lot better and it respects the SQL standards a lot more than MySQL. I'm still a newbie in the PostgreSQL world though and since I'm willing to move away from MySQL for all my future projects, what I want to know is: is there any particular feature of MySQL that it is done better (as in more performant or more user friendly etc..) than in PostgreSQL? I'm wondering what I'm gonna miss from MySQL. I already found that the AUTO_INCREMENT fields in MySQL are more handy than SEQUENCES in PostgreSQL and the deployment in windows was problematic in the past (not a problem anymore. never a problem for me). What else? Thanks.

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• SmartOS Virtualization with one public IP address

  - by matejkramny

  Is it possible? (title of this question) Googling Virtualization with one public IP address yields nothing useful What I have: SmartOS on a dedicated server. Dedicated server has one public IP address. What I want to do: Host multiple guest OS from that server Problem: Access to the guest through the (server that virtualizes the guest)'s IP address. Is this possible at all? Sorry, newbie to all this Research http://www.machine-unix.com/beginning-with-smartos/#comment-7256 Does not solve my problem - the guide sets up an internal IP http://blog.bgentil.fr/smartos-use-global-zone-as-gateway-for-guests.html Ideas Perhaps it is possible to do host-based translation like with nginx proxy?

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• Linux : Forward users mail using exim4 server (newbiw warning)

  - by llazzaro

  Hello, I have a network of linux server, one of them is running exim4 that server could send [email protected]. At exim4 server, I had setup an alias for the users accounts ...for example root : [email protected] But I have other server, if I put the alias email is marked as spam...since they arent using exim4 server. I want to configure the other server to use that exim4 server, in order to dont get the mails mark as spam. Well I know this is really newbie question, but searching at google is difficult since it confuses exim4 server configuration than the client configuration to use exim4 server. Remember, I want root@server1,root@server2,etc mails send via exim4 server!

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• Make PATH variable changes permanent on openSuse

  - by Marlon

  Okay, so I'm trying to do something that should be rather simple but for some reason I can't quite seem to make it work. All I simply want to do is add a path to the PATH environment variable in openSuse. So far, I've edited the following line in /etc/default/su : PATH=/usr/local/bin:/bin:/usr/bin with this line : PATH=/usr/local/bin:/bin:/usr/bin:/usr/local/php/bin:/usr/local/mysql/bin Basically, all I want to do is have access to php and mysqld regardless of how I log in directly from the command prompt without having to type trailing /usr/local/php/bin/ every time. Am I even editing the right file? I'm a bit of a Linux newbie and to achieve something as trivial as this is eluding me. Server gods out there, drop be a crumb, please? :-)

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• setting rpmforge repository for Linux (RHEL)

  - by Ashish

  Hello, I had a Linux centos(5.5) machine, on this i had deployed amavisd (with clamav and spamassassin). Referred these: http://wiki.centos.org/HowTos/Amavisd http://wiki.centos.org/PackageManagement/Yum/Priorities Now I have a linux RHEL machine, details are as follows: (Linux version 2.6.18-164.6.1.el5 ([email protected]) (gcc version 4.1.2 20080704 (Red Hat 4.1.2-46)) x86_64 GNU/Linux Red Hat Enterprise Linux Server release 5.5 (Tikanga)) I want to set up the above mentioned software's on this(RHEL) machine, for that I do (as per the reference link): install yum-priorities but i am unable to install this on my said machine, because the default yum repository provided by RHEL doesn't contain this. How can i deploy the above software's on my RHEL machine, suggest any safe alternate. Please guide since i am a newbie in this matter. thanks in advance Ashish Sharma

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• OpenVPN vs. IPSec - Pros and Cons, what to use?

  - by jens

  interestingly I have not found any good searchresults when searching for "OpenVPN vs IPSec": I need to setup a private LAN over an untrusted network. And as far as I know, both approaces seem to be valid. But I do not know which one is better. I would be very thankfull If you can list the pro's and con's of both approaches and maybe your suggestions and experiences what to use. Update (Regarding the comment/question): In my concrete case the goal is to have any number of Servers (with static IPs) be connected transparently with each other. But a small portion of "dynamic clients like road warriors" (with dynamic IPs) should also be able to connect. The main goal is however having a "transparent secure network" run top of untrusted network. I am quite a newbie so I do not know how to correctly interprete "1:1 Point to Point Connections" = The solution should support Broadcasts and all that stuff so it is a fully functional network... Thank you very much!! Jens

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