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• How much of the "Objective-C" I'm learning is universal Objective-C, and not Apple's frameworks?

  - by Chris Cooper

  This question is related to one of my others about C: What can you do in C without “std” includes? Are they part of “C,” or just libraries? I've become curious lately as to what is really contained the the core Objective-C language, and what parts of the Objective-C I've done for iPhone/OS X development is specific to Apple platforms. I know that things like syntax are the same, but for instance, is NSObject and its torrent of NS-subclasses actually part of "standard" Objective-C? Could I use them in, say, Windows? What parts are universal for the most part, and what parts would I only find on an Apple platform? If you want, giving an example of Objective-C used elsewhere as an example of what is more "universal" would help me as well. Thanks! =)

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• What does !! (double exclamation point) mean?

  - by molecules

  In the code below, from a blog post by Alias, I noticed the use of the double exclamation point !!. I was wondering what it meant and where I could go in the future to find explanations for Perl syntax like this. (Yes, I already searched for '!!' at perlsyn). package Foo; use vars qw{$DEBUG}; BEGIN { $DEBUG = 0 unless defined $DEBUG; } use constant DEBUG => !! $DEBUG; sub foo { debug('In sub foo') if DEBUG; ... } UPDATE Thanks for all of your answers. Here is something else I just found that is related The List Squash Operator x!!

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• Wrangling Control of HTTP Headers in ASP.NET

  - by Andrew Burgess

  I'm working with ASP.NET MVC3, and I'm trying to get absolute control over my headers because a client application that I'm working with expects a very specific content type. What I'm finding when using Fiddler to examine the HTTP traffic is that the text encoding is being returned as part of the header. For example, the client is expecting application/appname in the Content-Type header, but the server is returning application/appname; charset=utf-8. I think the client is using a strict comparison for checking the type, so I want to be able to specify exactly what is emitted in the headers. Right now I have a custom ActionResult in which I clear the headers and then specify only the content type, but the encoding still seems to be added on. How can I remove the encoding from the Content-Type header?

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• Why does my NSWindow only receive mouseOver events the first time?

  - by DanieL

  I have an application where a borderless window is shown and hidden, using orderOut and orderFront. When it is visible, I want the it to become the key window when the mouse moves over it. So far I've done this: In awakeFromNib I have set its first responder to itself. In the window's constructor I set accepts mouse events to YES. In the mouseMoved method, I use makeKeyAndOrderToFront. My problem is, that this only works the first time I move the mouse over the window. After that, it doesn't receive any mouseOver events. I've tried checking the firstResponder but as far as I can tell it never changes from the window. Any ideas what I can do to get this working?

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• iphlpapi / ifdef.h

  - by Mike D

  I'm trying to use iphlpapi (GetAdapterInfo) and am having trouble compiling the code. I have iphlpapi.h from SDK 7 and have added the appropriate path to the include files in visual studio. I get the following error... c:\program files\microsoft sdks\windows\v7.0\include\ifdef.h(154) : error C2146: syntax error : missing ';' before identifier 'NET_IFTYPE' The lines in ifdef where this occurs are shown below. typedef NET_LUID IF_LUID, *PIF_LUID; typedef ULONG NET_IFINDEX, *PNET_IFINDEX; // Interface Index (ifIndex) typedef UINT16 NET_IFTYPE, *PNET_IFTYPE; // Interface Type (IANA ifType)

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• MySQL LOAD DATA LOCAL INFILE example in python?

  - by David Perron

  I am looking for a syntax definition, example, sample code, wiki, etc. for executing a LOAD DATA LOCAL INFILE command from python. I believe I can use mysqlimport as well if that is available, so any feedback (and code snippet) on which is the better route, is welcome. A Google search is not turning up much in the way of current info The goal in either case is the same: Automate loading hundreds of files with a known naming convention & date structure, into a single MySQL table. David

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• Idiots guide to app engine and memcache

  - by Gareth Simpson

  I am struggling to find a good tutorial or best practices document for the use of memcache in app engine. I'm pretty happy with it on the level presented in the docs. Get an object by ID, checking memcache first, but I'm unclear on things like: If you cache a query, is there an accepted method for ensuring that the cache is cleared/updated when an object stored in that query is updated. What are the effects of using ReferenceProperties ? If a cache a Foo object with a Bar reference. Is my foo.bar in memcache too and in need of clearing down if it gets updated from some other part of my application. I don't expect answers to this here (unless you are feeling particularly generous!), but pointers to things I could read would be very gratefully received.

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• Sharepoint Foundation 2010 development environment installation problems

  - by Robert Koritnik

  I'm having problems installing development machine for Sharepoint (Foundation) 2010. This is what I did so far on the same machine: Installed a clean Windows 7 x64 with 4GB of RAM without being part of any domain. Just a simple standalone machine. Enabled IIS related features as described here except IIS6 related ones (two of them) Installed SQL Server 2008 R2 Development Edition (DB Engine and Writer being enabled but not SQL Agent) Installed Visual Studio 2010 Premium Started installing Sharepoint Foundation 2010 with first extracting files, changing config to enable Windows 7 installation and then installed it as Server Farm (then Complete) to avoid installing SQL Express. Created a separate SPF_CONFIG local user with Logon on as a service right. Opened SPF Management Shell and run New-SPConfigurationDatabase so I am able to use a non-domain username (SPF_CONFIG that I created in the previous step) But all I get is this: The outcome after this error is: Database Sharepoint2010Config is created User SPF_CONFIG is added to SQL Server and attached to this newly created database as dbowner Checking SQL server security logins this user has following rights: dbcreator securityadmin public

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• Iterate through a DataTable to find elements in a List object?

  - by Darth Continent

  As I iterate through a DataTable object, I need to check each of its DataRow objects against the items in a generic string List. I found a blog post using the List's Find method along with a delegate, but whereas that example has a separate class (Person), I'm attempting something like the following using an instance of the string object: // My definition of the List object. List<string> lstAccountNumbers = new List<string>(); ... // I populate the List via its Add method. ... foreach (DataRow drCurrentRow in dtMyDataTable.Rows) { if (lstAccounts.Find(delegate(string sAccountNumber) { return sAccountNumber == drCurrentRow["AccountNumber"]; }) { Found_DoSomething(); } else { NotFound_DoSomethingElse(); } } However, with this syntax I'm receiving "Cannot implicitly convert type 'string' to 'bool'" for the if block. Could someone please clarify what I'm doing wrong and how best to accomplish what I'm trying to do?

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• How to find all Classes implemeting IDisposable?

  - by apoorv020

  I am working on a large project, and one of my tasks is to remove possible memory leaks. In my code, I have noticed several IDisposable items not being disposed of, and have fixed that. However, that leads me to a more basic question, how do I find all classes used in my project that implement IDisposable? (Not custom created classes by normal Library classes). I have already found one less-than-obvious class that implements IDisposable ( DataTable implements MarshalByValueComponent, which inherits IDisposable). Right now, I am manually checking any suspected classes by using MSDN, but isn't there some way through which I can automate this process?

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• Replace newline from MySQL TEXT field to parse w/ JSON

  - by dr3w

  Hi, "replace newline" seems to be a question asked here and there like hundred times already. But however, i haven't found any working solution for myself yet. I have a textarea that i use to save data into DB. Then using AJAX I want to get data from the DB in the backend that is in TEXT field and to pass it to frontend using JSON. But pasing JSON returns an error, as new lines from DB are not valid JSON syntax, I guess i should use \n instead... But how do i replace newlinew from DB with \n? I've tried this $t = str_replace('<br />', '\n', nl2br($t)); and this $t = preg_replace("/\r\n|\n\r|\r|\n/", "\n", $t); and using CHAR(13) and CHAR(10), and still I get an error the new line in textarea is equivalent to, i guess $t = 'text with a newline'; it gives the same error. And in notepad i clearly see that it is crlf

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• WCF Web Service chnage wsdl name and targetNamespace

  - by Graham

  All, I'm a little new to WCF over IIS but have done some ASMX web services before. My WCF service is up and running but the helper page generated by the web service for me has the default names, i.e. the page that says: You have created a service. To test this service, you will need to create a client and use it to call the service. You can do this using the svcutil.exe tool from the command line with the following syntax: svcutil.exe http://localhost:53456/ServicesHost.svc?wsdl In a standard ASMX site I would use method/class attributes to give the web service a name and a namespace. When I click on the link the WSDL has: <wsdl:definitions name="SearchServices" targetNamespace="http://tempuri.org/" i.e. not the WCF Service Contract Name and Namespace from my Interface. I assume the MEX is using some kind of default settings but I'd like to change them to be the correct names. How can I do this?

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• Django and mod_python config

  - by Peter

  My Django project is placed in /www/host1/htdocs/my/project, www and my are links to other actual folders. Apache has mod_python enabled. I have a .htaccess in project folder: SetHandler python-program PythonHandler django.core.handlers.modpython SetEnv DJANGO_SETTINGS_MODULE project.settings PythonDebug On PythonOption django.root /my/project PythonPath "['/www/host1/htdocs/my/project'] + sys.path" I suppose my site should be accessible from http://host1/my/project, but I see the following error: ImportError: Could not import settings 'project.settings' (Is it on sys.path? Does it have syntax errors?): No module named project.settings Can somebody give any suggestions?

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• optional local variables in rails partial templates: how do I get out of the (defined? foo) mess?

  - by brahn

  I've been a bad kid and used the following syntax in my partial templates to set default values for local variables if a value wasn't explicitly defined in the :locals hash when rendering the partial -- <% foo = default_value unless (defined? foo) %> This seemed to work fine until recently, when (for no reason I could discern) non-passed variables started behaving as if they had been defined to nil (rather than undefined). As has been pointed by various helpful people on SO, http://api.rubyonrails.org/classes/ActionView/Base.html says not to use defined? foo and instead to use local_assigns.has_key? :foo I'm trying to amend my ways, but that means changing a lot of templates. Can/should I just charge ahead and make this change in all the templates? Is there any trickiness I need to watch for? How diligently do I need to test each one?

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• Using C# and VB.NET in one solution

  - by Younes

  I'm busy on a small project to convert an Access2003 db to .NET. I am trying to integrate my functionality in an excisting project that is being used for Administration of some kind. The code in this project is vb.net. I started by setting up my Data Access Layer, which seems to work fine. I can make new web pages that acces the data I need. However when i start to use class files to set up my Business Logic Layer i can't build my project when using C# instead of VB. I Dislike VB and like to program in C# as i know the syntax alot better etc. Is it possible to program using C# knowing that VB.NET was the language chosen to buold the entire project on? If not, what will be the smartest way to integrate my module into the project using my favorite programming language? (Make a project and reference to the dll?)

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• How to check for duplicate files?

  - by miorel

  I have an external hard drive on which I have backed up files several times. Some files were modified between backups, others were not. Some may have been renamed. Now I'm running out of space, and I'd like to clean up duplicate files. My idea was to md5sum every file on the drive, then look for duplicates, and diff the relevant files (just in case, haha). Is this the best way to do this? What are some other methods of checking for duplicate files?

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• bash script problem, find , mv tilde files created by gedit

  - by Ke

  Hi, im using linux with gedit which has the wonderful habit of creating a temp file with a tilde at the end for every file I edit. im trying to move all of these files at once to a different folder using the following: find . -iname “*.php~” -exec mv {} /mydir \; However, its now giving me syntax errors, as if it were searching through each file and trying to move the piece of text. I just want to move all of the files ending in .php~ to another directory. Any idea how I do that? Cheers Ke

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• How to download the Enthought Tool Suite python script?

  - by user1539217

  I have Python downloaded already, but want to contribute code to the Enthought Tool Suite (ETS). According to this site (http://code.enthought.com/source/): it says to download the following python script: https://raw.github.com/enthought/ets/master/ets.py I put the ets.py into the python script, save as...and in the Python Shell, I typed in "import ets" However, nothing happens. Also, the site says to run the following commands: $ mkdir ets $ cd ets # and copy ets.py here $ python ets.py clone Typing those lines in Python Shell gives me the message: "SyntaxError: invalid syntax" As you can see, I'm new to Python, and I don't know what I'm doing. How do I download the ETS script and run the commands??

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• How do i enable transactions

  - by acidzombie24

  I have a similar question of how to check if you are in a transaction. Instead of checking how do i allow nested transactions? I am using Microsoft SQL File Database with ADO.NET. I seen examples using tsql and examples starting transactions using begin and using transaction names. When calling connection.BeginTransaction i call another function pass in the same connection and it calls BeginTransaction again which gives me the exception SqlConnection does not support parallel transactions. It appears many microsoft variants allow this but i cant figure out how to do it with my .mdf file. How do i allow nested transactions with a Microsoft SQL File Database using C# and ADO.NET?

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• Typescript + requirejs: How to handle circular dependencies?

  - by Aymeric Gaurat-Apelli

  I am in the process of porting my JS+requirejs code to typescript+requirejs. One scenario I haven't found how to handle is circular dependencies. Require.js returns undefined on modules that are also dependent on the current and to solve this problem you can do: MyClass.js define(["Modules/dataModel"], function(dataModel){ return function(){ dataModel = require("Modules/dataModel"); ... } }); Now in typescript, I have: MyClass.ts import dataModel = require("Modules/dataModel"); class MyClass { dataModel: any; constructor(){ this.dataModel = require("Modules/dataModel"); // <- this kind of works but I lose typechecking ... } } How to call require a second time and yet keep the type checking benefits of typescript? dataModel is a module { ... }

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• database design question

  - by Leonardo

  Hi all, I am building a database as a simple exercise, it could be hosted on any database server, so I am trying to keep things as much standard as possible. Basically what I would like to do is a 'code' table that get referenced by other entities. I explain: xcode id code r role p property code r admin r staff p title .... then I would like to have some view like: role (select * from code where xcode='r') r admin r staff property (select * from code where xcode='p') p title then, suppose we have an entity myentity id - 1 role - admin (foreign key to role) title - title (foreign key to property) Obviously I cannot create foreign key to a view, but this is to tell the idea I have in mind. How can I reflect such behaviour using whenever possible, standard sql syntax, then as a second option, database additional features like trigger ecc... ? Because if I tell that role and title in myentity are foreign key to 'code', instead of the views, nothing would stop me to insert a role in title field. thanks Leonardo

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• asp.net form validation. Server-side or client-side

  - by Jeroen

  Here's (i think) an interesting question. With AJAX more and more common i feel more and more like doing all form validation server-side. Picture a registration form pre-AJAX. You have all your validation client-side using the common asp validation controls and validation summery...except...checking username availability, check emailadress availability, captcha and what not. So you end up with 2 kinds of validation and so presenting the user with 2 different UI's at 2 different moments. 2 words come to my mind. Ugly. Inconsistent. So here's the question. Why not do all the validation server-side (using AJAX or not). (I'm not using JQuery yet, should i?)

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• python: iif or (x ? a : b)

  - by Albert

  If Python would support the (x ? a : b) syntax from C/C++, I would write: print paid ? ("paid: " + str(paid) + " €") : "not paid" I really don't want to have an if-check and two independent prints here (because that is only an example above, in my code, it looks much more complicated and would really be stupid to have almost the same code twice). However, Python does not support this operator or any similar operator (afaik). What is the easiest/cleanest/most common way to do this? I have searched a bit and seen someone defining an iif(cond,iftrue,iffalse) function, inspired from Visual Basic. I wondered if I really have to add that code and if/why there is no such basic function in the standard library.

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• LIKE operator with $variable

  - by skarama

  This is my first question here and I hope it is simple enough to get a quick answer! Basically, I have the following code: $variable = curPageURL(); $query = 'SELECT * FROM `tablename` WHERE `columnname` LIKE '$variable' ; If I echo the $variable, it prints the current page's url( which is a javascript on my page) Ultimately, what I want, is to be able to make a search for which the search-term is the current page's url, with wildcards before and after. I am not sure if this is possible at all, or if I simply have a syntax error, because I get no errors, simply no result! I tried : $query = 'SELECT * FROM `tablename` WHERE `columnname` LIKE '"echo $variable" ' ; But again, I'm probably missing or using a misplaced ' " ; etc. Please tell me what I'm doing wrong!

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• Convert perl one-liner into a script

  - by Stefan Lasiewski

  I find alot of perl one-liners online. Sometimes I want to convert these one-liners into a script, because otherwise I'll forget the syntax of the one-liner. For example, I'm using the following command (from nagios.com): tail -f /var/log/nagios/nagios.log | perl -pe 's/(\d+)/localtime/e' I'd to replace it with something like this: tail -f /var/log/nagios/nagios.log | ~/bin/nagiostime.pl However, I can't figure out the best way to quickly throw this stuff into a script. Does anyone have a quick way to throw these one-liners into a Bash or Perl script?

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