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  • Why not to use Array of errors instead of Exception Handling !?

    - by Naughty.Coder
    Why not using array of errors instead of throwing errors and check if it's not empty later in the code.... Exception handling is very confusing to me , I can not understand it's purpose ... can anybody enlighten me !? they compare it with die() as better not to stop the execution of the code , why would I stop the execution of code if I don't want to !? ofcourse I do I'm a beginner programmer , it might be confusing to you as well , or because i'm not very experienced in this ugly thing. Please in the context of PHP only.

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  • chomsky hierarchy and programming languages

    - by dader51
    Hi, I'm trying to learn some aspects of the CH ( chomsky hierarchy ) which are related to PL ( programming languages ), and i still have to read the Dragon Book. I've read that most of the PL can be parsed as CFG ( context free grammar ). In term of computational power, it equals the one of a pushdown non deterministic automaton. Am I right ? If it's true, then how could a CFG holds a UG ( unrestricted grammar, which is turing complete ) ? I'm asking because, even if PL are CFG they are actually used to describe TM (turing machines ) and through UG. I think that's because of at least two different levels of computing, the first, which is the parsing of a CFG focuses on the syntax related to the structure ( representation ? ) of the language, while the other focuses on the semantic ( sense, interpretation of the data itself ? ) related to the capabilities of the pl which is turing complete. Again, are these assumptions rights ? thanx a lot.

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  • How do I insert into a unique key into a table?

    - by Ben McCormack
    I want to insert data into a table where I don't know the next unique key that I need. I'm not sure how to format my INSERT query so that the value of the Key field is 1 greater than the maximum value for the key in the table. I know this is a hack, but I'm just running a quick test against a database and need to make sure I always send over a Unique key. Here's the SQL I have so far: INSERT INTO [CMS2000].[dbo].[aDataTypesTest] ([KeyFld] ,[Int1]) VALUES ((SELECT Max([KeyFld]) FROM [dbo].[aDataTypesTest]) + 1 ,1) which errors out with: Msg 1046, Level 15, State 1, Line 5 Subqueries are not allowed in this context. Only scalar expressions are allowed. I'm not able to modify the underlying database table. What do I need to do to ensure a unique insert in my INSERT SQL code?

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  • Using Regex.Replace() to replace text in a string

    - by aspdotnetuser
    Hi, I want to use Regex.Replace() to loop through a string containing words that are separated by '//' to check if any of the words match a string value which has been passed to the method. Here's my code at the moment: public void CheckText(string text) { //Check text entered by user string wordList = "word1//word2//word3 etc..."; string replaceString = "matched"; if (!string.IsNullOrEmpty(wordList)) { return Regex.Replace(text, wordList); //How do I implement this part? } } Please could someone help me with this? Any help/comments will be appreciated! Thanks,

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  • Animation on the iPhone - use image sequence or rotation?

    - by user157733
    I am creating a basic animation for my iPhone app. I have a choice to make between 2 different types of animation. I can use this... NSArray *myImages = [NSArray arrayWithObjects: [UIImage imageNamed:@"myImage1.png"], [UIImage imageNamed:@"myImage2.png"], [UIImage imageNamed:@"myImage3.png"], [UIImage imageNamed:@"myImage4.gif"], nil]; UIImageView *myAnimatedView = [UIImageView alloc]; [myAnimatedView initWithFrame:[self bounds]]; myAnimatedView.animationImages = myImages; myAnimatedView.animationDuration = 0.25; [self addSubview:myAnimatedView]; [myAnimatedView release]; or something like this... [UIView beginAnimations:nil context:NULL]; [UIView setAnimationDuration:1.5]; // other animations goes here myImage.transform = CGAffineTransformMakeRotation(M_PI*0.5); // other animations goes here [UIView commitAnimations]; I have quite a few of these parts to animate so I want to choose an option which uses the least amount of memory and runds the quickest. Any advice would be great, thanks

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  • box stacking in graph theory

    - by mozhdeh
    Please help me find a good solution for this problem. We have n boxes with 3 dimensions. We can orient them and we want to put them on top of another to have a maximun height. We can put a box on top of an other box, if 2 dimensions (width and lenght) are lower than the dimensions of the box below. For exapmle we have 3 dimensions w*D*h, we can show it in to (h*d,d*h,w*d,d*W,h*w,w*h) please help me to solve it in graph theory.

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  • Can't get python.manage.py syncdb to work

    - by Diego
    I just created my first django app, initialized variables DATABASE_ENGINE and DATABASE_NAME in settings.py, but now when I run python manage.py syncdb, I get the following error Can somebody help? Does this have to do with having two python versions installed? I'm a django/python noob, please help. thanks!! my-computer:~/Django-1.1.1 mycomp$ python manage.py syncdb /Library/Frameworks/Python.framework/Versions/2.6/Resources/Python.app/Contents/MacOS/Python: can't open file 'manage.py': [Errno 2] No such file or directory my-computer:~/Django-1.1.1 mycomp$ export PATH=/Users/mycomp/bin:$PATH

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  • Is there a suggested solution structure for ASP.NET MVC Production Apps

    - by Eoin Campbell
    In general, I don't like to keep code (BaseClasses or DataAccess Code) in the App_Code directory of an ASP.NET Site. I'll usually pull this stuff out into a MySite.BusinessLogic & MySite.DataAccess DLL's respectively. I'm wondering should I be doing the same for ASP.NET MVC. Would it be better to Organise the solution something along the lines of MySite.Common - DLL - (Basic Functionality built on .NET System Dlls) MySite.DAL - DLL - (DataAccessLayer & DBML Files) MySite.Models - DLL - (MVC Models e.g. Repository Classes) MySite.Controllers - DLL (MVC Controllers which use Models) MySite - ASP.NET MVC Site. Or am I missing something... presumably, I'll lose some of the nice (Add View, Go To Controller, context menu items that have been added)

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  • Locating binding errors

    - by softengine
    I'm dealing with a large WPF application that is outputting a large number of binding errors. A typical error looks like this: System.Windows.Data Error: 4 : Cannot find source for binding with reference 'RelativeSource FindAncestor, AncestorType='System.Windows.Controls.ItemsControl', AncestorLevel='1''. BindingExpression:Path=HorizontalContentAlignment; DataItem=null; target element is 'MenuItem' (Name=''); target property is 'HorizontalContentAlignment' (type 'HorizontalAlignment') Problem is I don't know where in the app this is coming from. Searching the entire solution for AncestorType={x:Type ItemsControl} doesn't necessary help since I still don't know which result is the culprit. I've tried setting PresentationTraceSources.DataBindingSource.Switch.Level = SourceLevels.All; but the extra information doesn't help locate the problematic bindings. File names and line numbers is really what I need. Is there anyway to get this information?

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  • how to setup the sphinx with netbeans

    - by Pradeep
    i have successfully configured sphinx4 with eclipse. for that these steps i have used. copy my java and config files to SRC folder all the necessary jar files (in the lib). the lib folder added to the root of the project build those jar files (jsapi files too) change the configuration file and give the proper path test the java file but in Netbeans i really dont understand how to do the proper steps. can someone help me. the jar files should be added to "Libraries" rite. then after adding them how to build them. in the netbeans it dont show a SRC folder. so all the java files and configuration files should go to Source Packages folder rite. can someone help me with this. please

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  • "java.lang.ClassNotFoundException: javax.ejb.EJBObject" when running JAR

    - by Bernhard V
    Hi, I'm getting a "java.lang.ClassNotFoundException: javax.ejb.EJBObject" error when I'm running my application as a JAR file. When running it in Eclipse everything is working fine. The application properly access the main class and the main method. But when it tries to load the application context it cannot resolve a reference to an EJB bean. I then get the following error: Error creating bean with name 'bc' defined in class path resource [blabla.xml]: Initialization of bean failed; nested exception is java.lang.NoClassDefFoundError: javax/ejb/EJBObject at org.springframework.beans.factory.support.BeanDefinitionValueResolver .resolveReference(BeanDefinitionValueResolver.java:275) ... Caused by: java.lang.ClassNotFoundException: javax.ejb.EJBObject I've included all runtime-scoped dependencies with Maven in the JAR file. Do you know any further information regarding this error?

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  • How to avoid "source !=null" when using Code Contracts and Linq To Sql?

    - by Florian
    I have the following code using a normal data context which works great: var dc = new myDataContext(); Contract.Assume(dc.Cars!= null); var cars = (from c in dc.Cars where c.Owner = 'Jim' select c).ToList(); However when I convert the filter to an extension method like this: var dc = new myDataContext(); Contract.Assume(dc.Cars!= null); var cars = dc.Cars.WithOwner('Jim'); public static IQueryable<Car> WithOwner(IQueryable<Car> cars, string owner) { Contract.Requires(cars != null); return cars.Where(c => c.Owner = owner); } I get the following warning: warning : CodeContracts: requires unproven: source != null

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  • Why array size in llvm created by llvm's internal tools is not good enough for llvm?

    - by vava
    I'm getting strange error message from the following code: ArrayType * arrayType = ArrayType::get(Type::getInt32Ty(ctx), 0); stack = builder->CreateAlloca(arrayType, ConstantArray::get(arrayType, std::vector<Constant *>())); This code compiles fine but it gives me llvm::Value* getAISize(llvm::LLVMContext&, llvm::Value*): Assertion `Amt-getType() == Type::getInt32Ty(Context) && "Malloc/Allocation array size is not a 32-bit integer!"' failed. during execution. What's interesting, is that I never said of what type array size should be, it was created somewhere inside helper functions. So I naturally see no good reason for assert to be there. But I must be doing something wrong anyway, can you help me spot the problem? Thanks in advance. PS. LLVM, as good as it is, lacking documentation tremendously.

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  • Javascript problems?

    - by jiexi
    I've been staring at the source code of these two download pages for awhile now and i can't seem to find the problem. I have two download pages, one where the javascript is working, one where it isnt. working: http://justupload.it/v/lfd7 not: http://justupload.it/v/ljhv The working one allows me to rotate the image and reveal the comments box by clicking on the comments button. The non-working one does not let me do that stuff. Can anyone help me find the problem or recommend a program to help me do it?

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  • How to silently import a Certificate into a specific Certificate Store?

    - by Adriaan
    I am attempting to import a Certificate into the Current User - Personal store using the command line "importpfx -f [certificate name.p12] -p [password] -t USER -s Personal". It works, but for reasons I don't understand there are now two Personal stores under the Current User, and the imported certificate is in the new Personal store. When I try to connect to the website of [well-known money transfer service], it fails. However, if I manually import the certificate using MMC into the original Personal store, it works. My question is: How can I force IMPORTPFX to import the certificate into the original Personal store, and how can I delete the new Personal store? Context: I need to do a silent import of certificates on 3000+ remote point-of-sale devices, so it needs to be a silent install via PSEXEC (SysInternals).

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  • Problems upgrading MySQL application from Delphi 2006 to 2010

    - by WombaT
    I upgraded my Delphi to 2010 version and I tried to open and run application written in Delphi 2006. The app is using mysql by dbexpress with libmysql.dll and a second driver found somewhere on the Internet. I can't run it on 2010. I'm always getting "missing libmysql.dll library". I tried to get new version of it but it didn't help. Copying this library into almost all system directories didn't help. I'm out of any ideas what to do, how do I connect to database :(

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  • Rails 3 Server Startup problem with fastercsv

    - by Anand
    I have a rails 2.3.5 app getting upgraded to Rails 3. I did every thing I am required to do for upgrading and when I start the rails server using rails server it gives me this Please switch to Ruby 1.9's standard CSV library. It's FasterCSV plus support for Ruby 1.9's m17n encoding engine. I am using ruby-1.9.2-p0 and have fastercsv (1.5.3) gem installed. with the help of puts statements, i was able to track down where the error occurred. i found that the execution stops at this line Bundler.require(:default, Rails.env) if defined?(Bundler) in application.rb file. I tried many things but none worked .. please help..

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  • Subclipse > Accidental Merge Conflict Resolution

    - by DTS
    I'm trying to merge changes from one branch into another using Subclipse. On a particular file in a particular subdirectory, I had a file conflict and edited the conflicts via the context menu option for this. However, when I went to resolve the conflict I apparently chose the wrong option and was left with the original unmerged file in my branch. Since then, I can no longer get this file back into a conflicted state so I can resolve this issue properly. I've tried deleting the file and the directory that contains it, to no avail. Any ideas?

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  • Ejb lookup failing on WAS7.0 with NamingException

    - by Ayush
    Hi, I have an application developed on RAD using WAS 6.0. I migrated the code to WID 7.0. After making some changes in the EJB modules(Had to remove the bnd.xmi file from each ejb module to deploy the application on Application Server)the application is running fine, but the EJB modules give the following error: NamingException has Occured While Getting Local Home javax.naming.NameNotFoundException:nullName ejb/com/igcc not found in context "local:". I am not able to figure out what changes do it need to make to run the application on WID. Any help is appreciated. Thanks, Ayush

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  • Kohana 3: Example of model with validation

    - by Svish
    I find examples and tutorials about models and about validation. And I places that say the validation (or most of it at least) should be in the model, which I agree with. But I can't any examples or tutorials that show how that should be done. Could anyone help me with a simple example on how that could be done? Where would you have the rules in the model? Where would the validation happen? How would the controller know if the validation passed or fail? How would the controller get error messages and things like that? Hope someone can help, cause feel a bit lost here :p

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  • Debugging dynamic sql + dynamic tables in MS SQL Server 2008.

    - by Hamish Grubijan
    Hi, I have a messy stored procedure which uses dynamic sql. I can debug it in runtime by adding print @sql; where @sql; is the string containing the dynamic SQL, right before I call execute (@sql);. Now, the multi-page stored procedure also creates dynamic tables and uses them in a query. I want to print those tables to the console right before I do an execute, so that I know exactly what the query is trying to do. However, the SQL Server 08 does not like that. When I try: print #temp_table; and try to compile the S.P. I get this error: The name "#temp_table" is not permitted in this context. Valid expressions are constants, constant expressions, and (in some contexts) variables. Column names are not permitted. Please help.

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