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• Can somebody explain this Objective C method declaration syntax

  - by Doug R

  I'm working through an iPhone development book* without really knowing Objective C. For the most part I'm able to follow what's going on, but there are a few method declarations like the one below that I'm having a bit of trouble parsing. For example: - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger) section { return [self.controllers count]; //controllers is an instance variable of type NSArray in this class } It looks this is a method called numberOfRowsInSection, and it returns an NSInteger, and takes an NSInteger as a parameter which is locally called 'section'. But I don't understand all the references to tableView, or why this takes a parameter when it is not used within the method. Can somebody clarify this? Thanks. *p. 258, Beginning iPhone 3 Development, by Mark and LaMarche, published by Apress

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• Linux: file recovery (Urgent) [closed]

  - by Ashine

  Hi Firends, I desperately need some help regarding problem I am facing now. While creating a softlink for a very important file I gave the reverse command by mistake. Instead of giving it "ln target linkname" I have given it 'ln linkname target'. This has resulted in references pointing to target files are now pointing to links and the actual refernces to target files are lost. How can I recover the files back. "/home/user/data1" was original file location. "/home/user/db2" was the desired softlink for this data. I haveto give "ln data1 db2" but I have given 'ln db2 data1'. This has resulted in 'data1' being now pointing towards 'db2' and the actual data in 'data1' can not be retrieved. Some one please help. Thanks in advance.

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• ExecutionEngineException thrown when loading native dll in c#

  - by Axarydax

  Hi there. I have a 32-bit .net application that uses a native 32-bit DLL via DllImport(). The native DLL is our internal file analysis library, and I need to use it as porting it to C# would be a problem if people update it (other software uses it). The problem is that when I try to execute any method in the native DLL I get a System.ExecutionEngineException thrown. In fact, I've reduced the managed application to a simple tester that just calls a native method, but it still fails. I am on 64-bit Windows 7, but that should not matter as I'm compiling everything as 32-bit binaries. What is also interesting, when I look at the native DLL in the Dependency Walker, it shows that it can't find msvcr90.dll - but when I open any other of our native DLLs in the Dependency Walker, it can find their referenced msvcr90.dll just fine. Can there by some wrongness in the compilation of native DLL that messss up its DLL references?

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• ExecutionEngineException thrown when loading native dll

  - by Axarydax

  I have a 32-bit .net application that uses a native 32-bit DLL via DllImport(). The native DLL is our internal file analysis library, and I need to use it as porting it to C# would be a problem if people update it (other software uses it). The problem is that when I try to execute any method in the native DLL I get a System.ExecutionEngineException thrown. In fact, I've reduced the managed application to a simple tester that just calls a native method, but it still fails. I am on 64-bit Windows 7, but that should not matter as I'm compiling everything as 32-bit binaries. What is also interesting, when I look at the native DLL in the Dependency Walker, it shows that it can't find msvcr90.dll - but when I open any other of our native DLLs in the Dependency Walker, it can find their referenced msvcr90.dll just fine. Can there by some wrongness in the compilation of native DLL that messes up its DLL references?

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• Linked Server related

  - by rmdussa

  I have two instances of SQL Server: Server1 (SQL Server 2008) Server2 (SQL Server 2005) I am executing a stored procedure from Server1 which references tables on Server2. It is working fine in my test environment: Server1 runs Vista SP2, SQL Server 2008; Server2 runs Windows XP SP2, SQL Server 2005. However, it is not working in the production environment: Server1 runs Vista SP1, SQL Server 2008; Server2 runs Windows XP SP2, SQL Server 2005. The error message I receive is: OLE DB provider "SQLNCLI10" for linked server "Server2" returned message "No transaction is active.". Msg 7391, Level 16, State 2, Line 21 The operation could not be performed because OLE DB provider "SQLNCLI10" for linked server "Server2" was unable to begin a distributed transaction.

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• A tool or framework extension or code snippet for logging the internal state of objects?

  - by George Mauer

  When spiking on how something works or when my unit test behave in an unpredictable manner I usually have to drop into debug mode. 99% of my time in debug mode is spent checking the values of fields on objects to verify its state. I already have log4net set up, it would seem that if I could easily add a line of code to log out the state of objects I could remove most of my need to start up the bulky debugger. The problem is of course that to expose object state implicitly you need to manually override each object's ToString() method. What I would like to be able to do is the ability to do logger.LogState(someObject) and have logged out the object state including at least a formatted list of all the private variables, references (to some arbitrary depth), and collections. Does anyone know a tool/framework/code snippet that can be used to generate a string of the internal state of any object? I could of course write one myself but its a non-trivial problem and I'd prefer something someone has put some thought into.

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• Refferenced by projects .net 4.0 assemblies have no IL. How? and What for?

  - by er-v

  There is something I don't understand. Today I desided to find out what is inside Sistem.Web.dll version 4.0.0.0 So I decided to find the place where this assembly located. and opened this assembly with reflector - all methods were empty - and then with ilDasm from 7.0 SDK. This what I saw After some research I've found fullfeatured assemblies in gac. Actualy here C:\Windows\assembly\NativeImages_v4.0.30319_32\System.Web\82087f17d3b3f9c493e7261d608a6af4 They are much larger in size. So why does references goes not to the gac, but to the C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETFramework\v4.0\ Why don't they have IL inside? How does it works? Mabe I don't understand something.

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• Is there an easy way to get a list of all successful captures from a regex pre-5.10?

  - by Chas. Owens

  I know the right way to do this if I have Perl 5.10 is to use named captures and values %+, but in Perl 5.8.9 and how can I get a list of successful captures? I have come up with two methods that are both just terrible: #you need to list each possible match my @captures = grep { defined } ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12, $13, $14, $15, $16); and #ew, I turned on symbolic references { no strict 'refs'; my @captures = map { defined $+[$_] ? $$_ : () } 1 .. $#+; } There is a third option I have found involving (?{}), but it requires global variables (because the closure happens at compile time) and takes the regex from reasonably clear to ungodly mess. The only alternative I have found is to capture the whole match and then use another set of regexes to get the values I want (actually I build the first regex out of the other regexes because there is no good reason to duplicate the logic).

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• using MEF with NHibernate and windsor

  - by Fran

  I have an ASP.net MVC application that is using NHibernate under the covers for data access. I'm using the Windsor container to handle injecting ISession references into each controller. This works great, but now I'm looking to expand my application with a pluggable architecture so that I can have a core product and specific add-ons. I found a great article on doing this with MEF. My question is how to make the Windsor container and MEF container, life/work together so that I can achieve this. There was an article (http://codebetter.com/blogs/glenn.block/archive/2009/10/31/should-i-use-mef-with-an-ioc-container.aspx) by Glenn Block that talked about this exact issue. Then end then said that the next article would show you how to do this, but there's no part 2. Has anyone created an application like this using asp.net mvc, mef, nhibernate, castle windsor?

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• Visual Studio add-in to quickly test a code snippet

  - by Matti Virkkunen

  One thing I really love about languages such as Python is that if you have a piece of code you'd like to try out, you can just open the interactive shell and do it in seconds. Is there a Visual Studio add-in that does the same for C#? Basically what I'm looking for is something that opens up a window or tab with a text editor (preferably with code completion, because VS does it so nicely) and a button that runs the code and displays the output. Extra points for convenience features such as displaying complex output in a user-friendly way (think Firebug's console.log), automatically referencing all the assemblies the current project references, etc. I tried googling for a while, but either I fail at coming up with good keywords, or no-one has made an add-in like this. If there really is none, I'm considering making one myself.

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• AdMob SDK for iPad?

  - by pix0r

  Trying to get my Universal app released and I rely on AdMob ads for revenue in this particular app. I'm having an issue getting AdMob support working, though I keep finding references to people actually running AdMob on their iPad Simulators. Terminating app due to uncaught exception 'AdMobInvalidLibaryVersionException', reason: 'This version of AdMob SDK is incompatible with the iPhone 3.2 SDK or above. Make sure your Active SDK is set to 3.1.X . If you need to build with 3.2, use the 3.2 preview library.' I have not been able to find this "3.2 preview library" anywhere. Any ideas?

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• VS2010 MVC and Entity Framework Model in Separate Project

  - by mdm

  Hi, I am trying to use an Entity Framework Model (in separate project) into an asp.net 4 MVC project (VS2010, C#) If I create the EF inside the MVC project I have no problems. I think I am missing some step. things done: 1. added reference to the EF class project 2. added connection string in MVC web.config 3. added reference to System.Data.Entity in both web.config and project references Now i can use the model only if I copy the .edmx file to the Models folder, but in this way the EF project is not external anymore. What am I missing? Thank you in advance.

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• What is the underlying reason for not being able to put arrays of pointers in unsafe structs in C#?

  - by cons

  If one could put an array of pointers to child structs inside unsafe structs in C# like one could in C, constructing complex data structures without the overhead of having one object per node would be a lot easier and less of a time sink, as well as syntactically cleaner and much more readable. Is there a deep architectural reason why fixed arrays inside unsafe structs are only allowed to be composed of "value types" and not pointers? I assume only having explicitly named pointers inside structs must be a deliberate decision to weaken the language, but I can't find any documentation about why this is so, or the reasoning for not allowing pointer arrays inside structs, since I would assume the garbage collector shouldn't care what is going on in structs marked as unsafe. Digital Mars' D handles structs and pointers elegantly in comparison, and I'm missing not being able to rapidly develop succinct data structures; by making references abstract in C# a lot of power seems to have been removed from the language, even though pointers are still there at least in a marketing sense. Maybe I'm wrong to expect languages to become more powerful at representing complex data structures efficiently over time.

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• Insert record in Linq to Sql

  - by Anders Svensson

  Is this the easiest way to insert a record with Linq to Sql when there's a many-to-many relationship, or is there a better/cleaner way? I wasn't sure why things weren't working at first, but when I added a second SubmitChanges() it worked. Why was this necessary? Would be grateful if someone could clarify this a bit! private void InsertNew() { UserPageDBDataContext context = new UserPageDBDataContext(); User user = new User(); ManyToMany.Model.Page page = new ManyToMany.Model.Page(); user.Name = "Madde Andersson"; page.Url = "anderscom/references"; context.Users.InsertOnSubmit(user); context.Pages.InsertOnSubmit(page); context.SubmitChanges(); UserPage userPage = new UserPage(); userPage.UserID = user.UserID; userPage.PageID = page.PageID; user.UserPages.Add(userPage); context.SubmitChanges(); }

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• How do I create a foreign key in SQL Server?

  - by mmattax

  I have never "hand coded" creation code for SQL Server and foreign key deceleration is seemingly different from SQL Server and Postgres...here is my sql so far: drop table exams; drop table question_bank; drop table anwser_bank; create table exams ( exam_id uniqueidentifier primary key, exam_name varchar(50), ); create table question_bank ( question_id uniqueidentifier primary key, question_exam_id uniqueidentifier not null, question_text varchar(1024) not null, question_point_value decimal, constraint question_exam_id foreign key references exams(exam_id) ); create table anwser_bank ( anwser_id uniqueidentifier primary key, anwser_question_id uniqueidentifier, anwser_text varchar(1024), anwser_is_correct bit ); when I run the query I get this error: Msg 8139, Level 16, State 0, Line 9 Number of referencing columns in foreign key differs from number of referenced columns, table 'question_bank'. Can you spot the error? thanks.

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• Change namespace/filesystem folder names in Visual Studio

  - by Rosarch

  I'm trying to change a namespace in Visual Studio. My folder structure looks something like this: GameAlpha/ GameAlpha.sln GameAlphaRelease/ GameAlphaTest/ GameAlphaLevelEditor/ These include namespaces like GameAlphaRelease. I want to change all this to GameBetaRelease. Before this process, it built fine. First, I changed the solution and project files from Alpha to Beta. Then, I did a "find-replace-all" on the namespace. Finally, I went through the properties of each project and changed the "Assembly Name" and "Default Namespace" to the appropriate Beta title. However, now the solution does not build. The error is: GameAlpha.accessor: The reference to 'GameAlpha.exe' was not found in the list of this projects references. (Project: GameBetaTest) What am I doing wrong? If I remove project GameBetaTest, the solution builds just fine. Also, what is the preferable way to change the names of the folders in the file system?

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• Why is there so much "magic" in Perl?

  - by eugene y

  I'm looking through perlop and perlsub pages of the Perl manual. There are many references about "magic" and "magical" here (just search any of them for the "magic"). I wonder why is Perl so rich in them. Some examples: print ++($foo = 'zz') # prints 'aaa' printf "%d: %s", $! = 1, $! # prints '1: Operation not permitted' use warnings; my $i; print $i++ # no warning for uninitialized value while (my $line = <FH>) { ... } # $line is actually tested for definedness

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• Source control products that support linked/shared files?

  - by Ian Boyd

  We're interested in moving from a source control system that supports the concept of shared or linked files. A shared file means: a file modified in one project, is automatically updated changed in every other project that uses that same file. It does this without a developer having to request it, reverse-integrate it, ask for it, or even want it. We're trying to see if any other commonly used source-control systems can meet our needs, and include linked or shared files. My limited research shows that: Team Foundation Server doesn't support sharing files Subversion doesn't support sharing files (including Externals) CVS doesn't support sharing files (including Modules) Anything else? (besides our current source control product, obviously) References Subversion and shared files across repositories/projects? How to share files between CVS projects? Will TFS ever support shared files for projects under source control?

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• Eclipse execute a file in jar

  - by hara

  Hi I'm developing an Eclipse product. In my plugin i have added an executable file (.exe) which i need to execute. When i launch the product from the eclipse, the file is referenced using the path of the executable on my file system and all went ok. When i export the product the plugin is packaged in a jar file which contains the executable file too. When it references the file the path is something like : $path_to_the_plugin_jar!/$path_to_exe_file_inside_the_jar Using this path to launch a new Process Thrown an exception. How can i refer to a file inside a jar?How could i execute the file? Can i extract the file when i export the product with eclipse? thanks

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• Migrating VseWss project to WspBuilder

  - by Khurram Aziz

  I have a VseWss project that I want to migrate to WspBuilder. The project has many features (Content Types, Fields, Lists, Event Listeners, Workflows, ASPX files, their code behind etc) and the project references couple of other assemblies as well. And it does the SafeControls entries and deploys the assemblies into GAC etc Important aspect is; the WSP that gets created from the VseWss is deployed to the production server and while migrating I want to preserve all of these things so that when I create the WSP from WspBuilder things are transparent for the Sharepoint Administrators. Please guide me how to proceed...any online tutorial or related stuff that talks about migrating a real world VseWss project (with 10-20 different types of features)

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• How to create multiple tables with the same schema using SQLite jdbc

  - by Space_C0wb0y

  I want to split a large table horizontally, and I would like to make sure that all three of them have the same schema. Currently I am using this piece of code to create the tables: statement .executeUpdate("CREATE TABLE AnnotationsMolecularFunction (Id INTEGER PRIMARY KEY ASC AUTOINCREMENT, " + "ProteinId NOT NULL, " + "GOId NOT NULL, " + "UNIQUE (ProteinId, GOId)" + "FOREIGN KEY(ProteinId) REFERENCES Protein(Id))"); There is one such statement for each table. This is bad, because if I decide to change the schema later (which will most certainly happen), I will have to change it three times, which begs for errors, so I would like a way to make sure that the other tables have the same schema without explicitly writing it again. I can use: statement .executeUpdate("CREATE TABLE AnnotationsBiologicalProcess AS SELECT * FROM AnnotationsMolecularFunction"); to create the other tables with the same columns, but the constraints are not aplied. I could of course just generate the same query-string three times with different table-names in Java, but I would like to know if there is an SQL-way of achieving this.

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• Replacing string literal values in Visual Studio project templates

  - by Daniel A. White

  I notice when I create a project template from an existing project in my solution, it does a semi-string replace to update references. However, it does not replace string literals. It does update my web.config file, but not code files. The project template: namespace MyTemplateProject { class MyClass { public string GetStringValue() { return "MyProjectTemplate"; } } } The generated code when used as a template: namespace MyActualNewProject { class MyClass { public string GetStringValue() { return "MyProjectTemplate"; } } } How can I instruct the template maker to replace "MyProjectTemplate" wih "MyActualNewProject"?

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• How far does Dependency Injection reach?

  - by Baddie

  My web app solution consists of 3 projects: Web App (ASP.NET MVC) Business Logic Layer (Class Library) Database Layer (Entity Framework) I want to use Ninject to manage the lifetime of the DataContext generated by the Entity Framework in the Database Layer. The Business Logic layer consists of classes which reference repositories (located in the database layer) and my ASP.NET MVC app references the business logic layer's service classes to run code. Each repository creates an instance of the MyDataContext object from the Entity Framework Repository public class MyRepository { private MyDataContext db; public MyRepository { this.db = new MyDataContext(); } // methods } Business Logic Classes public class BizLogicClass { private MyRepository repos; public MyRepository { this.repos = new MyRepository(); } // do stuff with the repos } Will Ninject handle the lifetime of MyDataContext despite the lengthy dependency chain from the Web App to the Data Layer?

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• Deadlock error in INSERT statement

  - by Gnanam

  We've got a web-based application. There is a time-bound database operation (INSERTs and UPDATEs) in the application which takes more time to complete, hence this particular flow has been changed into Java Thread so it will not wait (block) for the complete database operation to be completed. My problem is, if more than 1 user come across this particular flow, I'm facing the following error thrown by PostgreSQL: org.postgresql.util.PSQLException: ERROR: deadlock detected Detail: Process 13560 waits for ShareLock on transaction 3147316424; blocked by process 13566. Process 13566 waits for ShareLock on transaction 3147316408; blocked by process 13560. Above error is consistently thrown in INSERT statements. Additional Information: 1) I have PRIMARY KEY defined in this table. 2) There are FOREIGN KEY references in this table. 3) Separate database connection is passed to each Java Thread. Technologies Web Server: Tomcat v6.0.10 Java v1.6.0 Servlet Database: PostgreSQL v8.2.3 Connection Management: pgpool II

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• How does jQuery stores data with .data()?

  - by TK

  I am a little confused how jQuery stores data with .data() functions. Is this something called expando? Or is this using HTML5 Web Storage although I think this is very unlikely? The documentation says: The .data() method allows us to attach data of any type to DOM elements in a way that is safe from circular references and therefore from memory leaks. As I read about expando, it seems to have a rick of memory leak. Unfortunately my skills are not enough to read and understand jQuery code itself, but I want to know how jQuery stores such data by using data(). http://api.jquery.com/data/

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