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  • Update Package Manager failed, E:type "ain"

    - by Robert
    The Update Manager failed and gave me this error: E:Type 'ain' is not known on line 3 in source list /etc/apt/sources.list.d/scopes-packagers-ppa-precise.list What should I do? This message came up when I followed the editor's instructions: $cat /etc/apt/sources.list.d/scopes-packagers-ppa-precise.list deb http://ppa.launchpad.net/scopes-packagers/ppa/ubuntu precise main deb-src http://ppa.launchpad.net/scopes-packagers/ppa/ubuntu precise main ain$

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  • C++11 Tidbits: Decltype (Part 2, trailing return type)

    - by Paolo Carlini
    Following on from last tidbit showing how the decltype operator essentially queries the type of an expression, the second part of this overview discusses how decltype can be syntactically combined with auto (itself the subject of the March 2010 tidbit). This combination can be used to specify trailing return types, also known informally as "late specified return types". Leaving aside the technical jargon, a simple example from section 8.3.5 of the C++11 standard usefully introduces this month's topic. Let's consider a template function like: template <class T, class U> ??? foo(T t, U u) { return t + u; } The question is: what should replace the question marks? The problem is that we are dealing with a template, thus we don't know at the outset the types of T and U. Even if they were restricted to be arithmetic builtin types, non-trivial rules in C++ relate the type of the sum to the types of T and U. In the past - in the GNU C++ runtime library too - programmers used to address these situations by way of rather ugly tricks involving __typeof__ which now, with decltype, could be rewritten as: template <class T, class U> decltype((*(T*)0) + (*(U*)0)) foo(T t, U u) { return t + u; } Of course the latter is guaranteed to work only for builtin arithmetic types, eg, '0' must make sense. In short: it's a hack. On the other hand, in C++11 you can use auto: template <class T, class U> auto foo(T t, U u) -> decltype(t + u) { return t + u; } This is much better. It's generic and a construct fully supported by the language. Finally, let's see a real-life example directly taken from the C++11 runtime library as implemented in GCC: template<typename _IteratorL, typename _IteratorR> inline auto operator-(const reverse_iterator<_IteratorL>& __x, const reverse_iterator<_IteratorR>& __y) -> decltype(__y.base() - __x.base()) { return __y.base() - __x.base(); } By now it should appear be completely straightforward. The availability of trailing return types in C++11 allowed fixing a real bug in the C++98 implementation of this operator (and many similar ones). In GCC, C++98 mode, this operator is: template<typename _IteratorL, typename _IteratorR> inline typename reverse_iterator<_IteratorL>::difference_type operator-(const reverse_iterator<_IteratorL>& __x, const reverse_iterator<_IteratorR>& __y) { return __y.base() - __x.base(); } This was guaranteed to work well with heterogeneous reverse_iterator types only if difference_type was the same for both types.

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  • System won't boot unless I type "exit" at initramfs prompt

    - by Ozzah
    I installed MDADM for my RAID, and ever since that when I boot up the system just sits at the purple screen forever. After pulling my hair out for a week, I finally discovered - purely by accident - that it's sitting at an initramfs prompt in the background and I have to blindly type "exit" and then Ubuntu resumes normal boot. How do I fix this? I am unable to reboot my machine if I'm not sitting in front of it because it will never boot!

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  • Lot of "file not found" when using sudo find / -type s

    - by Andrea Moro
    In the attempt to understand why I keep getting the following error error: 'Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2)' while using the command sudo find / -type s the terminal prompted something like this find: ‘/proc/31348/task/31348/fd/5’: No such file or directory find: ‘/proc/31348/task/31348/fdinfo/5’: No such file or directory find: ‘/proc/31348/fd/5’: No such file or directory find: ‘/proc/31348/fdinfo/5’: No such file or directory What does this mean?

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  • What is this type of sound effect called?

    - by Fibericon
    There is a sound typically associated with a bright flash of light, which starts with a lower whirring noise, then breaks into a higher pitched sound. What is that type of sound called? I'm not sure how to begin searching for that, so a typical name for it would be very helpful. It's something similar to what occurs at 0:41 in this youtube video (here's a link to a few seconds beforehand), where Naruto 6 tails transforms into Kyuubei in Naruto Generations.

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  • An Overview of the SQL Server xml Data Type

    XML is, it seems, everywhere. SQL Server has ever-improving functionality that helps us peek into, shred, store, manipulate and otherwise utilize XML. This article covers XML variables, XML columns, typed vs. untyped XML, and the xml data type methods.

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  • Wrong CSS mime type with Roundcube 0.5 beta and nginx

    - by Julien Vehent
    I'm running into a CSS problem. This is a setup based on Debian Squeeze (nginx/0.7.67, php5/cgi) on which I installed the latest Roundcube 0.5 beta. PHP is properly processed, login works fine but the CSS files are not loaded and Firefox is throwing the following errors: Error: The stylesheet https://webmail.example.net:10443/roundcube/skins/default/common.css?s=1290600165 was not loaded because its MIME type, "text/html", is not "text/css". Source File: https://webmail.example.net:10443/roundcube/?_task=login Line: 0 Error: The stylesheet https://webmail.example.net:10443/roundcube/skins/default/mail.css?s=1290156319 was not loaded because its MIME type, "text/html", is not "text/css". Source File: https://webmail.example.net:10443/roundcube/?_task=login Line: 0 As far as I understand, nginx doesn't see the .css extension (because ofthe ?s= argument) and thus set the mime type with the default value, being text/html. Should I fix this in nginx (and how ?) or is it roundcube's related ? Edit: It seems that it's nginx related. The content-type isn't set for any other type than text/html. I had to include manually the following declarations to force CSS and JS content-types. That's ugly, and I never had the problem before... any idea ? location ~ \.css { add_header Content-Type text/css; } location ~ \.js { add_header Content-Type application/x-javascript; }

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  • Wrong CSS mime type with Roundcube 0.5 beta and nginx

    - by Julien Vehent
    I'm running into a CSS problem. This is a setup based on Debian Squeeze (nginx/0.7.67, php5/cgi) on which I installed the latest Roundcube 0.5 beta. PHP is properly processed, login works fine but the CSS files are not loaded and Firefox is throwing the following errors: Error: The stylesheet https://webmail.example.net:10443/roundcube/skins/default/common.css?s=1290600165 was not loaded because its MIME type, "text/html", is not "text/css". Source File: https://webmail.example.net:10443/roundcube/?_task=login Line: 0 Error: The stylesheet https://webmail.example.net:10443/roundcube/skins/default/mail.css?s=1290156319 was not loaded because its MIME type, "text/html", is not "text/css". Source File: https://webmail.example.net:10443/roundcube/?_task=login Line: 0 As far as I understand, nginx doesn't see the .css extension (because ofthe ?s= argument) and thus set the mime type with the default value, being text/html. Should I fix this in nginx (and how ?) or is it roundcube's related ? Edit: It seems that it's nginx related. The content-type isn't set for any other type than text/html. I had to include manually the following declarations to force CSS and JS content-types. That's ugly, and I never had the problem before... any idea ? location ~ \.css { add_header Content-Type text/css; } location ~ \.js { add_header Content-Type application/x-javascript; }

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  • Calling Save on a Configuration obj with a custom sectiongroup of type NameValueSectionHandler

    - by Allen
    I've got aConfiguration object that I can easily read and write settings from and call Save(ConfigurationSaveMode.Minimal, true) on and that typically works just fine. However, I now have a config file that has a custom sectionGroup defined of type System.Configuration.NameValueSectionHandler (I didn't write that part and I can't change it). Now when I call the Save method, it throws a TypeLoadException Message: Type System.Configuration.NameValueSectionHandler does not inherit from System.Configuration.ConfigurationSectionGroup. Callstack: at System.Configuration.TypeUtil.VerifyAssignableType (Type baseType, Type type, Boolean throwOnError) at System.Configuration.TypeUtil.GetConstructorWithReflectionPermission (Type type, Type baseType, Boolean throwOnError) at System.Configuration.MgmtConfigurationRecord.CreateSectionGroupFactory (FactoryRecord factoryRecord) at System.Configuration.MgmtConfigurationRecord.EnsureSectionGroupFactory (FactoryRecord factoryRecord) at System.Configuration.MgmtConfigurationRecord.GetSectionGroup (String configKey) at System.Configuration.ConfigurationSectionGroupCollection.Get (String name) at System.Configuration.ConfigurationSectionGroupCollection. <GetEnumerator>d__0.MoveNext() at System.Configuration.Configuration.ForceGroupsRecursive (ConfigurationSectionGroup group) at System.Configuration.Configuration.SaveAsImpl (String filename, ConfigurationSaveMode saveMode, Boolean forceSaveAll) at System.Configuration.Configuration.Save (ConfigurationSaveMode saveMode, Boolean forceSaveAll) at MyCompany.MyProduct.blah.blah.Save () in C:\\projects\\blah\\blah\\blah.cs:line blah For reference, the configuration goes like so <configuration> <configSections> ... normal sections here that work just fine, followed by ... <sectionGroup name="threadSettings" type="System.Configuration.NameValueSectionHandler"> <section name="T1" type="System.Configuration.DictionarySectionHandler"/> <section name="T2" type="System.Configuration.DictionarySectionHandler"/> <section name="T3" type="System.Configuration.DictionarySectionHandler"/> </sectionGroup> </configSections> <applicationSettings /> <threadSettings> <T1> <add key="key-here" value="value-here"/> </T1> ... T2 and T3 here as well, thats not interesting ... </threadSettings> </configuration> If I remove the actual sections and the definition for the custom section groups, I am able to read / write settings just fine and even call Save just fine. Obviously the custom section groups could be setup a little nicer but I can't fix that so I'm wondering: Is it possible to get the Configuration object to save if it has custom sectionGroups of the NameValueSectionHandler type

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  • Using NHibernate to map a nChar column to an enumerated type

    - by Morrislgn
    Hello Folks, I am trying to map a table frp, a SQL Server 2005 DB to a class which contains an enum: public class MyClass{ private YesNoOptional addressSetting; public YesNoOptional AddressSetting{ {get; set;} } } public enum YesNoOptional { Yes, No, Optional } This will dictate that one of three values is inserted into the corresponding column - 'Y', 'N', 'O'. This column is of type nchar(1). My mapping file is like so (addressSetting is the property which is causing the problem): <class name="IncidentDefinition" table="IR_INCIDENT_DEF" lazy="false" > <id name="Guid" column="INT_GUID" > <generator class="guid"></generator> </id> <property name="Reference" column="INT_REF" ></property> <property name="Description" column="INT_DESCRIPTION" ></property> <property name="AddressSetting" column="INT_ADDRESS_REQ" ></property> <property name="Active" column="INT_ACTIVE" type="YesNo"></property> <property name="PinDocId" column="INT_PIN_DOC_ID"></property> </class> Using the config above I get the following error: NHibernate.ADOException: could not initialize a collection: System.FormatException: Input string was not in a correct format.. If I try to map the enum using a custom type like so: <property name="AddressSetting" column="INT_ADDRESS_REQ" type="ML.Types.YesNoOptional, ML.Types" ></property> Error: System.FormatException: Input string was not in a correct format. Next, if I try using a specific type like so: <property name="AddressSetting" column="INT_ADDRESS_REQ" type="String" ></property> This error is generated: NHibernate.PropertyAccessException: The type System.String can not be assigned to a property of type System.ArgumentException: Object of type 'System.String' cannot be converted to type 'ML.Types.YesNoOptional'.. As a last resort I tried to specify the type as a char like so: <property name="AddressSetting" column="INT_ADDRESS_REQ" type="Char" ></property> This works a bit better, as it in it doesnt throw an error, however instead of returning the character from the table and mapping it to the enumerated type the ASCII value of the character is returned instead - so Y is represented by 89! I am hoping someone can explain what I am doing wrong and\or how why this is happening please? Thanks Morris

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  • What's the C strategy to "imitate" a C++ template ?

    - by Andrei Ciobanu
    After reading some examples on stackoverflow, and following some of the answers for my previous questions (1), I've eventually come with a "strategy" for this. I've come to this: 1) Have a declare section in the .h file. Here I will define the data-structure, and the accesing interface. Eg.: /** * LIST DECLARATION. (DOUBLE LINKED LIST) */ #define NM_TEMPLATE_DECLARE_LIST(type) \ typedef struct nm_list_elem_##type##_s { \ type data; \ struct nm_list_elem_##type##_s *next; \ struct nm_list_elem_##type##_s *prev; \ } nm_list_elem_##type ; \ typedef struct nm_list_##type##_s { \ unsigned int size; \ nm_list_elem_##type *head; \ nm_list_elem_##type *tail; \ int (*cmp)(const type e1, const type e2); \ } nm_list_##type ; \ \ nm_list_##type *nm_list_new_##type##_(int (*cmp)(const type e1, \ const type e2)); \ \ (...other functions ...) 2) Wrap the functions in the interface inside MACROS: /** * LIST INTERFACE */ #define nm_list(type) \ nm_list_##type #define nm_list_elem(type) \ nm_list_elem_##type #define nm_list_new(type,cmp) \ nm_list_new_##type##_(cmp) #define nm_list_delete(type, list, dst) \ nm_list_delete_##type##_(list, dst) #define nm_list_ins_next(type,list, elem, data) \ nm_list_ins_next_##type##_(list, elem, data) (...others...) 3) Implement the functions: /** * LIST FUNCTION DEFINITIONS */ #define NM_TEMPLATE_DEFINE_LIST(type) \ nm_list_##type *nm_list_new_##type##_(int (*cmp)(const type e1, \ const type e2)) \ {\ nm_list_##type *list = NULL; \ list = nm_alloc(sizeof(*list)); \ list->size = 0; \ list->head = NULL; \ list->tail = NULL; \ list->cmp = cmp; \ }\ void nm_list_delete_##type##_(nm_list_##type *list, \ void (*destructor)(nm_list_elem_##type elem)) \ { \ type data; \ while(nm_list_size(list)){ \ data = nm_list_rem_##type(list, tail); \ if(destructor){ \ destructor(data); \ } \ } \ nm_free(list); \ } \ (...others...) In order to use those constructs, I have to create two files (let's call them templates.c and templates.h) . In templates.h I will have to NM_TEMPLATE_DECLARE_LIST(int), NM_TEMPLATE_DECLARE_LIST(double) , while in templates.c I will need to NM_TEMPLATE_DEFINE_LIST(int) , NM_TEMPLATE_DEFINE_LIST(double) , in order to have the code behind a list of ints, doubles and so on, generated. By following this strategy I will have to keep all my "template" declarations in two files, and in the same time, I will need to include templates.h whenever I need the data structures. It's a very "centralized" solution. Do you know other strategy in order to "imitate" (at some point) templates in C++ ? Do you know a way to improve this strategy, in order to keep things in more decentralized manner, so that I won't need the two files: templates.c and templates.h ?

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  • Problem with initializing a type with WinsdorContainer

    - by the_drow
    public ApplicationView(string[] args) { InitializeComponent(); string configFilePath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "log4net.config"); FileInfo configFileInfo = new FileInfo(configFilePath); XmlConfigurator.ConfigureAndWatch(configFileInfo); IConfigurationSource configSource = ConfigurationManager.GetSection("ActiveRecord") as IConfigurationSource; Assembly assembly = Assembly.Load("Danel.Nursing.Model"); ActiveRecordStarter.Initialize(assembly, configSource); WindsorContainer windsorContainer = ApplicationUtils.GetWindsorContainer(); windsorContainer.Kernel.AddComponentInstance<ApplicationView>(this); windsorContainer.Kernel.AddComponent(typeof(ApplicationController).Name, typeof(ApplicationController)); controller = windsorContainer.Resolve<ApplicationController>(); // exception is thrown here OnApplicationLoad(args); } The stack trace is this: Castle.MicroKernel.ComponentActivator.ComponentActivatorException was unhandled Message="ComponentActivator: could not instantiate Danel.Nursing.Scheduling.Actions.DataServices.NurseAbsenceDataService" Source="Castle.MicroKernel" StackTrace: at Castle.MicroKernel.ComponentActivator.DefaultComponentActivator.CreateInstance(CreationContext context, Object[] arguments, Type[] signature) at Castle.MicroKernel.ComponentActivator.DefaultComponentActivator.Instantiate(CreationContext context) at Castle.MicroKernel.ComponentActivator.DefaultComponentActivator.InternalCreate(CreationContext context) at Castle.MicroKernel.ComponentActivator.AbstractComponentActivator.Create(CreationContext context) at Castle.MicroKernel.Lifestyle.AbstractLifestyleManager.Resolve(CreationContext context) at Castle.MicroKernel.Lifestyle.SingletonLifestyleManager.Resolve(CreationContext context) at Castle.MicroKernel.Handlers.DefaultHandler.Resolve(CreationContext context) at Castle.MicroKernel.Resolvers.DefaultDependencyResolver.ResolveServiceDependency(CreationContext context, ComponentModel model, DependencyModel dependency) at Castle.MicroKernel.Resolvers.DefaultDependencyResolver.Resolve(CreationContext context, ISubDependencyResolver parentResolver, ComponentModel model, DependencyModel dependency) at Castle.MicroKernel.ComponentActivator.DefaultComponentActivator.CreateConstructorArguments(ConstructorCandidate constructor, CreationContext context, Type[]& signature) at Castle.MicroKernel.ComponentActivator.DefaultComponentActivator.Instantiate(CreationContext context) at Castle.MicroKernel.ComponentActivator.DefaultComponentActivator.InternalCreate(CreationContext context) at Castle.MicroKernel.ComponentActivator.AbstractComponentActivator.Create(CreationContext context) at Castle.MicroKernel.Lifestyle.AbstractLifestyleManager.Resolve(CreationContext context) at Castle.MicroKernel.Lifestyle.SingletonLifestyleManager.Resolve(CreationContext context) at Castle.MicroKernel.Handlers.DefaultHandler.Resolve(CreationContext context) at Castle.MicroKernel.Resolvers.DefaultDependencyResolver.ResolveServiceDependency(CreationContext context, ComponentModel model, DependencyModel dependency) at Castle.MicroKernel.Resolvers.DefaultDependencyResolver.Resolve(CreationContext context, ISubDependencyResolver parentResolver, ComponentModel model, DependencyModel dependency) at Castle.MicroKernel.ComponentActivator.DefaultComponentActivator.CreateConstructorArguments(ConstructorCandidate constructor, CreationContext context, Type[]& signature) at Castle.MicroKernel.ComponentActivator.DefaultComponentActivator.Instantiate(CreationContext context) at Castle.MicroKernel.ComponentActivator.DefaultComponentActivator.InternalCreate(CreationContext context) at Castle.MicroKernel.ComponentActivator.AbstractComponentActivator.Create(CreationContext context) at Castle.MicroKernel.Lifestyle.AbstractLifestyleManager.Resolve(CreationContext context) at Castle.MicroKernel.Lifestyle.SingletonLifestyleManager.Resolve(CreationContext context) at Castle.MicroKernel.Handlers.DefaultHandler.Resolve(CreationContext context) at Castle.MicroKernel.Resolvers.DefaultDependencyResolver.ResolveServiceDependency(CreationContext context, ComponentModel model, DependencyModel dependency) at Castle.MicroKernel.Resolvers.DefaultDependencyResolver.Resolve(CreationContext context, ISubDependencyResolver parentResolver, ComponentModel model, DependencyModel dependency) at Castle.MicroKernel.ComponentActivator.DefaultComponentActivator.CreateConstructorArguments(ConstructorCandidate constructor, CreationContext context, Type[]& signature) at Castle.MicroKernel.ComponentActivator.DefaultComponentActivator.Instantiate(CreationContext context) at Castle.MicroKernel.ComponentActivator.DefaultComponentActivator.InternalCreate(CreationContext context) at Castle.MicroKernel.ComponentActivator.AbstractComponentActivator.Create(CreationContext context) at Castle.MicroKernel.Lifestyle.AbstractLifestyleManager.Resolve(CreationContext context) at Castle.MicroKernel.Lifestyle.SingletonLifestyleManager.Resolve(CreationContext context) at Castle.MicroKernel.Handlers.DefaultHandler.Resolve(CreationContext context) at Castle.MicroKernel.DefaultKernel.ResolveComponent(IHandler handler, Type service, IDictionary additionalArguments) at Castle.MicroKernel.DefaultKernel.ResolveComponent(IHandler handler, Type service) at Castle.MicroKernel.DefaultKernel.get_Item(Type service) at Castle.Windsor.WindsorContainer.Resolve(Type service) at Castle.Windsor.WindsorContainer.ResolveT at Danel.Nursing.Scheduling.ApplicationView..ctor(String[] args) in E:\Agile\Scheduling\Danel.Nursing.Scheduling\ApplicationView.cs:line 65 at Danel.Nursing.Scheduling.Program.Main(String[] args) in E:\Agile\Scheduling\Danel.Nursing.Scheduling\Program.cs:line 24 at System.AppDomain._nExecuteAssembly(Assembly assembly, String[] args) at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args) at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly() at System.Threading.ThreadHelper.ThreadStart_Context(Object state) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state) at System.Threading.ThreadHelper.ThreadStart() InnerException: System.ArgumentNullException Message="Value cannot be null.\r\nParameter name: types" Source="mscorlib" ParamName="types" StackTrace: at System.Type.GetConstructor(BindingFlags bindingAttr, Binder binder, Type[] types, ParameterModifier[] modifiers) at Castle.MicroKernel.ComponentActivator.DefaultComponentActivator.FastCreateInstance(Type implType, Object[] arguments, Type[] signature) at Castle.MicroKernel.ComponentActivator.DefaultComponentActivator.CreateInstance(CreationContext context, Object[] arguments, Type[] signature) InnerException: It actually says that the type that I'm trying to initialize does not exist, I think. This is the concreate type that it complains about: namespace Danel.Nursing.Scheduling.Actions.DataServices { using System; using Helpers; using Rhino.Commons; using Danel.Nursing.Model; using NHibernate.Expressions; using System.Collections.Generic; using DateUtil = Danel.Nursing.Scheduling.Actions.Helpers.DateUtil; using Danel.Nursing.Scheduling.Actions.DataServices.Interfaces; public class NurseAbsenceDataService : AbstractDataService<NurseAbsence>, INurseAbsenceDataService { NurseAbsenceDataService(IRepository<NurseAbsence> repository) : base(repository) { } //... } } The AbstractDataService only holds the IRepository for now. Anyone got an idea why the exception is thrown?

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  • Change the content type of a pop up window.

    - by Oscar Reyes
    This question brought a new one: I have a html page and I need it to change the content type when the user press "save" button so the browser prompt to save the file to disk I've been doing this in the server side to offer "excel" versions of the page ( which is basically a html table ) <c:if test="${page.asExcelAction}"> <% response.setContentType("application/vnd.ms-excel"); %> What I'm trying to do now is to do the same, but in the client side with javacript but I can't manage to do it so. This is what I've got so far: <html> <head> <script> function saveAs(){ var sMarkup = document.getElementById('content').innerHTML; //var oNewDoc = document.open('application/vnd.ms-excel'); var oNewDoc = document.open('text/html'); oNewDoc.write( sMarkup ); oNewDoc.close(); } </script> </head> <body> <div id='content'> <table> <tr> <td>Stack</td> <td>Overflow</td> </tr> </table> </div> <input type="button" value="Save as" onClick="saveAs()"/> </body> </html>

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  • Why is Delphi unable to infer the type for a parameter TEnumerable<T>?

    - by deepc
    Consider the following declaration of a generic utility class in Delphi 2010: TEnumerableUtils = class public class function InferenceTest<T>(Param: T): T; class function Count<T>(Enumerable: TEnumerable<T>): Integer; overload; class function Count<T>(Enumerable: TEnumerable<T>; Filter: TPredicate<T>): Integer; overload; end; Somehow the compiler type inference seems to have problems here: var I: Integer; L: TList<Integer>; begin TEnumerableUtils.InferenceTest(I); // no problem here TEnumerableUtils.Count(L); // does not compile: E2250 There is no overloaded version of 'Count' that can be called with these arguments TEnumerableUtils.Count<Integer>(L); // compiles fine end; The first call works as expected and T is correctly inferred as Integer. The second call does not work, unless I also add <Integer -- then it works, as can be seen in the third call. Am I doing something wrong or is the type inference in Delphi just not supporting this (I don't think it is a problem in Java which is why expected it to work in Delphi, too).

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  • How to store an interger value of 4 bytes in a memory of chunk which is malloced as type char

    - by Adi
    Dear all, Hello Guys!! This is my first post in the forum . I am really looking forward to having good fun in this site. My question is : int mem_size = 10; char *start_ptr; if((start_ptr= malloc(mem_size*1024*1024*sizeof(char)))==NULL) {return -1;} I have allocated a chunk of memory of type char and size is say 10 MB (i.e mem_size = 10 ); Now I want to store the size information in the header of the memory chunk, To make myself more clear Lets Say : start_ptr = 0xaf868004 (This is the value I got from my execution, it changes every time) Now I want to put the size information in the start of this pointer.. i.e *start_ptr = mem_size*1024*1024; But I am not able to put this information in the start_ptr. I think the reason is because my ptr is of type char which only takes one byte but I am trying to store int which takes 4 bytes, is the problem . I am not sure how to fix this problem.. I would greatly appreciate your suggestions. Cheers!! Aditya

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  • Is it advisable to have an interface as the return type?

    - by wb
    I have a set of classes with the same functions but with different logic. However, each class function can return a number of objects. It is safe to set the return type as the interface? Each class (all using the same interface) is doing this with different business logic. protected IMessage validateReturnType; <-- This is in an abstract class public bool IsValid() <-- This is in an abstract class { return (validateReturnType.GetType() == typeof(Success)); } public IMessage Validate() { if (name.Length < 5) { validateReturnType = new Error("Name must be 5 characters or greater."); } else { validateReturnType = new Success("Name is valid."); } return validateReturnType; } Are there any pitfalls with unit testing the return type of an function? Also, is it considered bad design to have functions needing to be run in order for them to succeed? In this example, Validate() would have to be run before IsValid() or else IsValid() would always return false. Thank you.

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  • How to Implement Project Type "Copy", "Move", "Rename", and "Delete"

    - by Geertjan
    You've followed the NetBeans Project Type Tutorial and now you'd like to let the user copy, move, rename, and delete the projects conforming to your project type. When they right-click a project, they should see the relevant menu items and those menu items should provide dialogs for user interaction, followed by event handling code to deal with the current operation. Right now, at the end of the tutorial, the "Copy" and "Delete" menu items are present but disabled, while the "Move" and "Rename" menu items are absent: The NetBeans Project API provides a built-in mechanism out of the box that you can leverage for project-level "Copy", "Move", "Rename", and "Delete" actions. All the functionality is there for you to use, while all that you need to do is a bit of enablement and configuration, which is described below. To get started, read the following from the NetBeans Project API: http://bits.netbeans.org/dev/javadoc/org-netbeans-modules-projectapi/org/netbeans/spi/project/ActionProvider.html http://bits.netbeans.org/dev/javadoc/org-netbeans-modules-projectapi/org/netbeans/spi/project/CopyOperationImplementation.html http://bits.netbeans.org/dev/javadoc/org-netbeans-modules-projectapi/org/netbeans/spi/project/MoveOrRenameOperationImplementation.html http://bits.netbeans.org/dev/javadoc/org-netbeans-modules-projectapi/org/netbeans/spi/project/DeleteOperationImplementation.html Now, let's do some work. For each of the menu items we're interested in, we need to do the following: Provide enablement and invocation handling in an ActionProvider implementation. Provide appropriate OperationImplementation classes. Add the new classes to the Project Lookup. Make the Actions visible on the Project Node. Run the application and verify the Actions work as you'd like. Here we go: Create an ActionProvider. Here you specify the Actions that should be supported, the conditions under which they should be enabled, and what should happen when they're invoked, using lots of default code that lets you reuse the functionality provided by the NetBeans Project API: class CustomerActionProvider implements ActionProvider { @Override public String[] getSupportedActions() { return new String[]{ ActionProvider.COMMAND_RENAME, ActionProvider.COMMAND_MOVE, ActionProvider.COMMAND_COPY, ActionProvider.COMMAND_DELETE }; } @Override public void invokeAction(String string, Lookup lkp) throws IllegalArgumentException { if (string.equalsIgnoreCase(ActionProvider.COMMAND_RENAME)) { DefaultProjectOperations.performDefaultRenameOperation( CustomerProject.this, ""); } if (string.equalsIgnoreCase(ActionProvider.COMMAND_MOVE)) { DefaultProjectOperations.performDefaultMoveOperation( CustomerProject.this); } if (string.equalsIgnoreCase(ActionProvider.COMMAND_COPY)) { DefaultProjectOperations.performDefaultCopyOperation( CustomerProject.this); } if (string.equalsIgnoreCase(ActionProvider.COMMAND_DELETE)) { DefaultProjectOperations.performDefaultDeleteOperation( CustomerProject.this); } } @Override public boolean isActionEnabled(String command, Lookup lookup) throws IllegalArgumentException { if ((command.equals(ActionProvider.COMMAND_RENAME))) { return true; } else if ((command.equals(ActionProvider.COMMAND_MOVE))) { return true; } else if ((command.equals(ActionProvider.COMMAND_COPY))) { return true; } else if ((command.equals(ActionProvider.COMMAND_DELETE))) { return true; } return false; } } Importantly, to round off this step, add "new CustomerActionProvider()" to the "getLookup" method of the project. If you were to run the application right now, all the Actions we're interested in would be enabled (if they are visible, as described in step 4 below) but when you invoke any of them you'd get an error message because each of the DefaultProjectOperations above looks in the Lookup of the Project for the presence of an implementation of a class for handling the operation. That's what we're going to do in the next step. Provide Implementations of Project Operations. For each of our operations, the NetBeans Project API lets you implement classes to handle the operation. The dialogs for interacting with the project are provided by the NetBeans project system, but what happens with the folders and files during the operation can be influenced via the operations. Below are the simplest possible implementations, i.e., here we assume we want nothing special to happen. Each of the below needs to be in the Lookup of the Project in order for the operation invocation to succeed. private final class CustomerProjectMoveOrRenameOperation implements MoveOrRenameOperationImplementation { @Override public List<FileObject> getMetadataFiles() { return new ArrayList<FileObject>(); } @Override public List<FileObject> getDataFiles() { return new ArrayList<FileObject>(); } @Override public void notifyRenaming() throws IOException { } @Override public void notifyRenamed(String nueName) throws IOException { } @Override public void notifyMoving() throws IOException { } @Override public void notifyMoved(Project original, File originalPath, String nueName) throws IOException { } } private final class CustomerProjectCopyOperation implements CopyOperationImplementation { @Override public List<FileObject> getMetadataFiles() { return new ArrayList<FileObject>(); } @Override public List<FileObject> getDataFiles() { return new ArrayList<FileObject>(); } @Override public void notifyCopying() throws IOException { } @Override public void notifyCopied(Project prjct, File file, String string) throws IOException { } } private final class CustomerProjectDeleteOperation implements DeleteOperationImplementation { @Override public List<FileObject> getMetadataFiles() { return new ArrayList<FileObject>(); } @Override public List<FileObject> getDataFiles() { return new ArrayList<FileObject>(); } @Override public void notifyDeleting() throws IOException { } @Override public void notifyDeleted() throws IOException { } } Also make sure to put the above methods into the Project Lookup. Check the Lookup of the Project. The "getLookup()" method of the project should now include the classes you created above, as shown in bold below: @Override public Lookup getLookup() { if (lkp == null) { lkp = Lookups.fixed(new Object[]{ this, new Info(), new CustomerProjectLogicalView(this), new CustomerCustomizerProvider(this), new CustomerActionProvider(), new CustomerProjectMoveOrRenameOperation(), new CustomerProjectCopyOperation(), new CustomerProjectDeleteOperation(), new ReportsSubprojectProvider(this), }); } return lkp; } Make Actions Visible on the Project Node. The NetBeans Project API gives you a number of CommonProjectActions, including for the actions we're dealing with. Make sure the items in bold below are in the "getActions" method of the project node: @Override public Action[] getActions(boolean arg0) { return new Action[]{ CommonProjectActions.newFileAction(), CommonProjectActions.copyProjectAction(), CommonProjectActions.moveProjectAction(), CommonProjectActions.renameProjectAction(), CommonProjectActions.deleteProjectAction(), CommonProjectActions.customizeProjectAction(), CommonProjectActions.closeProjectAction() }; } Run the Application. When you run the application, you should see this: Let's now try out the various actions: Copy. When you invoke the Copy action, you'll see the dialog below. Provide a new project name and location and then the copy action is performed when the Copy button is clicked below: The message you see above, in red, might not be relevant to your project type. When you right-click the application and choose Branding, you can find the string in the Resource Bundles tab, as shown below: However, note that the message will be shown in red, no matter what the text is, hence you can really only put something like a warning message there. If you have no text at all, it will also look odd.If the project has subprojects, the copy operation will not automatically copy the subprojects. Take a look here and here for similar more complex scenarios. Move. When you invoke the Move action, the dialog below is shown: Rename. The Rename Project dialog below is shown when you invoke the Rename action: I tried it and both the display name and the folder on disk are changed. Delete. When you invoke the Delete action, you'll see this dialog: The checkbox is not checkable, in the default scenario, and when the dialog above is confirmed, the project is simply closed, i.e., the node hierarchy is removed from the application. However, if you truly want to let the user delete the project on disk, pass the Project to the DeleteOperationImplementation and then add the children of the Project you want to delete to the getDataFiles method: private final class CustomerProjectDeleteOperation implements DeleteOperationImplementation { private final CustomerProject project; private CustomerProjectDeleteOperation(CustomerProject project) { this.project = project; } @Override public List<FileObject> getDataFiles() { List<FileObject> files = new ArrayList<FileObject>(); FileObject[] projectChildren = project.getProjectDirectory().getChildren(); for (FileObject fileObject : projectChildren) { addFile(project.getProjectDirectory(), fileObject.getNameExt(), files); } return files; } private void addFile(FileObject projectDirectory, String fileName, List<FileObject> result) { FileObject file = projectDirectory.getFileObject(fileName); if (file != null) { result.add(file); } } @Override public List<FileObject> getMetadataFiles() { return new ArrayList<FileObject>(); } @Override public void notifyDeleting() throws IOException { } @Override public void notifyDeleted() throws IOException { } } Now the user will be able to check the checkbox, causing the method above to be called in the DeleteOperationImplementation: Hope this answers some questions or at least gets the discussion started. Before asking questions about this topic, please take the steps above and only then attempt to apply them to your own scenario. Useful implementations to look at: http://kickjava.com/src/org/netbeans/modules/j2ee/clientproject/AppClientProjectOperations.java.htm https://kenai.com/projects/nbandroid/sources/mercurial/content/project/src/org/netbeans/modules/android/project/AndroidProjectOperations.java

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  • Asset Pipeline acting up

    - by Abram
    Ok, so my asset pipeline has suddenly started acting up on my development machine. JS functions that previously worked are now throwing "not a function" errors.. I know I must be doing something wrong. A minute ago the datatables jquery function was working, then it was throwing an error, then it was working, and now it's not working or throwing an error. Here is my application.js //= require jquery //= require jquery-ui //= require jquery_ujs //= require_self //= require_tree . //= require dataTables/jquery.dataTables //= require dataTables/jquery.dataTables.bootstrap //= require bootstrap //= require bootstrap-tooltip //= require bootstrap-popover //= require bootstrap-tab //= require bootstrap-modal //= require bootstrap-alert //= require bootstrap-dropdown //= require jquery.ui.addresspicker //= require raty //= require jquery.alphanumeric //= require jquery.formrestrict //= require select2 //= require chosen/chosen.jquery //= require highcharts //= require jquery.lazyload Here is some of my layout header: <%= stylesheet_link_tag "application", media: "all" %> <%= yield(:scripthead) %> <%= javascript_include_tag "application" %> <%= csrf_meta_tags %> <%= yield(:head) %> Above I am using the yield to load up online scripts from google as they're only needed on some pages, and generally slow down the site if included in the application layout. I tried removing the yield but things were still broken, even after clearing the browser cache and running rake assets:clean (just to be on the safe side). Here's what shows up between CSS and metatags (for a page with nothin in the yield scripthead): <script src="/assets/jquery.js?body=1" type="text/javascript"></script> <script src="/assets/jquery-ui.js?body=1" type="text/javascript"></script> <script src="/assets/jquery_ujs.js?body=1" type="text/javascript"></script> <script src="/assets/application.js?body=1" type="text/javascript"></script> <script src="/assets/aidmodels.js?body=1" type="text/javascript"></script> <script src="/assets/audio.js?body=1" type="text/javascript"></script> <script src="/assets/bootstrap-alert.js?body=1" type="text/javascript"></script> <script src="/assets/bootstrap-dropdown.js?body=1" type="text/javascript"></script> <script src="/assets/bootstrap-modal.js?body=1" type="text/javascript"></script> <script src="/assets/bootstrap-popover.js?body=1" type="text/javascript"></script> <script src="/assets/bootstrap-tab.js?body=1" type="text/javascript"></script> <script src="/assets/bootstrap-tooltip.js?body=1" type="text/javascript"></script> <script src="/assets/branches.js?body=1" type="text/javascript"></script> <script src="/assets/charts.js?body=1" type="text/javascript"></script> <script src="/assets/chosen/backup_chosen.jquery.js?body=1" type="text/javascript"></script> <script src="/assets/chosen/chosen.jquery.js?body=1" type="text/javascript"></script> <script src="/assets/consumers.js?body=1" type="text/javascript"></script> <script src="/assets/dispensers.js?body=1" type="text/javascript"></script> <script src="/assets/favorites.js?body=1" type="text/javascript"></script> <script src="/assets/features.js?body=1" type="text/javascript"></script> <script src="/assets/generic_styles.js?body=1" type="text/javascript"></script> <script src="/assets/gmaps4rails/gmaps4rails.base.js?body=1" type="text/javascript"></script> <script src="/assets/gmaps4rails/gmaps4rails.bing.js?body=1" type="text/javascript"></script> <script src="/assets/gmaps4rails/gmaps4rails.googlemaps.js?body=1" type="text/javascript"></script> <script src="/assets/gmaps4rails/gmaps4rails.mapquest.js?body=1" type="text/javascript"></script> <script src="/assets/gmaps4rails/gmaps4rails.openlayers.js?body=1" type="text/javascript"></script> <script src="/assets/highcharts.js?body=1" type="text/javascript"></script> <script src="/assets/jquery-ui-1.8.18.custom.min.js?body=1" type="text/javascript"></script> <script src="/assets/jquery.alphanumeric.js?body=1" type="text/javascript"></script> <script src="/assets/jquery.formrestrict.js?body=1" type="text/javascript"></script> <script src="/assets/jquery.lazyload.js?body=1" type="text/javascript"></script> <script src="/assets/jquery.ui.addresspicker.js?body=1" type="text/javascript"></script> <script src="/assets/likes.js?body=1" type="text/javascript"></script> <script src="/assets/messages.js?body=1" type="text/javascript"></script> <script src="/assets/overalls.js?body=1" type="text/javascript"></script> <script src="/assets/pages.js?body=1" type="text/javascript"></script> <script src="/assets/questions.js?body=1" type="text/javascript"></script> <script src="/assets/raty.js?body=1" type="text/javascript"></script> <script src="/assets/reviews.js?body=1" type="text/javascript"></script> <script src="/assets/sessions.js?body=1" type="text/javascript"></script> <script src="/assets/styles.js?body=1" type="text/javascript"></script> <script src="/assets/tickets.js?body=1" type="text/javascript"></script> <script src="/assets/universities.js?body=1" type="text/javascript"></script> <script src="/assets/users.js?body=1" type="text/javascript"></script> <script src="/assets/dataTables/jquery.dataTables.js?body=1" type="text/javascript"></script> <script src="/assets/dataTables/jquery.dataTables.bootstrap.js?body=1" type="text/javascript"></script> <script src="/assets/bootstrap-transition.js?body=1" type="text/javascript"></script> <script src="/assets/bootstrap-affix.js?body=1" type="text/javascript"></script> <script src="/assets/bootstrap-button.js?body=1" type="text/javascript"></script> <script src="/assets/bootstrap-carousel.js?body=1" type="text/javascript"></script> <script src="/assets/bootstrap-collapse.js?body=1" type="text/javascript"></script> <script src="/assets/bootstrap-scrollspy.js?body=1" type="text/javascript"></script> <script src="/assets/bootstrap-typeahead.js?body=1" type="text/javascript"></script> <script src="/assets/bootstrap.js?body=1" type="text/javascript"></script> <script src="/assets/select2.js?body=1" type="text/javascript"></script> From application.rb: config.assets.initialize_on_precompile = false # Enable the asset pipeline config.assets.enabled = true config.action_controller.assets_dir = "#{File.dirname(File.dirname(__FILE__))}/public" # Version of your assets, change this if you want to expire all your assets config.assets.version = '1.0' I'm sorry, I'm not sure what else to include to help with this puzzle, but any advise would be appreciated. I was having no problems before I started trying to upload to heroku and now everything's gone haywire. EDIT: In the console at the moment I'm seeing Uncaught TypeError: Cannot read property 'Constructor' of undefined bootstrap-popover.js:33 Uncaught ReferenceError: google is not defined jquery.ui.addresspicker.js:25 Uncaught TypeError: Object [object Object] has no method 'popover' overall:476

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  • Does Chrome always adds an XLS extension on a vnd.ms-excel mime type?

    - by Claudio
    It seems that a simple download of a PHP generated CSV file (with a vnd.ms-excel mime type for the sake of opening it with (Open)Office readly upon the "Save as..." dialog, when present) always gets the unwanted .xls extension when the UA is Google Chrome. The file would then be named as myfile.csv.xls. Firefox behaves correctly. I wonder if it is a bug, a feature or a misunderstanding of some references. Thank you.

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  • How detect the file type (MIME) without considering the file extension?

    - by stuzzo
    I find a similar post http://stackoverflow.com/questions/58510/using-net-how-can-you-find-the-mime-type-of-a-file-based-on-the-file-signature and it is the same result I want, I tried to use it but I received always application/octet-stream instead of video/x-flv or video/x-msvideo. I think I miss something, have you any suggest for me? Should I add some kind of information on my workspace?

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