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• Why not System.Void?

  - by Stewart

  I have no practical reason for knowing this answer, but I'm curious anyway... In C#, trying to use System.Void will produce a compilation error: error CS0673: System.Void cannot be used from C# -- use typeof(void) to get the void type object As I understood it, void is simply an alias of System.Void. So, I don't understand why 'System.Void' can't be used directly as you might with 'string' for 'System.String' for example. I would love to read an explanation for this! Incidentally, System.Void can be successfully used with the Mono compiler, instead of Microsoft's .Net, and there it appears equivalent to using the void keyword. This must therefore be a compiler-enforced restriction rather than a CLR restriction, right?

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• Why is Wine not installable on my system?

  - by RawX

  So I upgraded on a fresh install to Ubuntu 12.10, not beta, and I've tried installing wine many many times now many different ways but the jist of it is this: This error could be caused by required additional software packages which are missing or not installable. Furthermore there could be a conflict between software packages which are not allowed to be installed at the same time. The following packages have unmet dependencies: wine: Any ideas? It won't let me install the dependencies either it says it needs another set of dependencies to install them -_- im on asus kj50 64bit os dual boot with windows 7 sudo apt-get install wine1.5 Reading package lists... Done Building dependency tree Reading state information... Done Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation: The following packages have unmet dependencies: wine1.5 : Depends: wine1.5-i386 (= 1.5.15-0ubuntu1) but it is not installable Recommends: gnome-exe-thumbnailer but it is not going to be installed or kde-runtime but it is not going to be installed Recommends: ttf-droid Recommends: ttf-mscorefonts-installer but it is not going to be installed Recommends: ttf-umefont but it is not going to be installed Recommends: ttf-unfonts-core but it is not going to be installed Recommends: winbind but it is not going to be installed Recommends: winetricks but it is not going to be installed E: Unable to correct problems, you have held broken packages.

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• How to pass objects to functions in C++?

  - by Rakesh K

  I am new to C++ programming, but I have experience in Java. I need guidance on how to pass objects to functions in C++. Do I need to pass pointers, references, or non-pointer and non-reference values? I remember in Java there are no such issues since we pass just the variable that holds reference to the objects. It would be great if you could also explain where to use each of those options.

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• RIM's New Mobile Voice System 5.0 Brings VoWi-Fi, UC to BlackBerry

  MVS 5 also achieves enhanced integration with the PBX for fixed/mobile convergence.

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• M5 Launches Smart Business Phone System

  Aimed first and foremost at sales and service operations, the new hosted PBX product automatically links phone activities to business applications.

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• RPG Equipped Item System

  - by Jimmt

  I'm making a 2d rpg with libgdx and java. I have an Inventory class with an Array of Items, and now I want to be able to equip items onto the player. Would it be more managable to do have every item have an "equipped" boolean flag have an "equipped" array in the player class have individual equipped fields in player class, e.g. private Item equippedWeapon; private Item equippedArmor; public void equipWeapon(Item weapon){ equippedWeapon = weapon; } Or just another way completely? Thanks.

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• Core Data - Limiting number of saved objects

  - by m_arc

  Hi! Is there way to limit the number of saved objects in coredata like stack, where the last objects are automatically deleted?

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• System doesn't boot due to a "[drm: drm_crtc_helper_set_config] * error * "

  - by Albin

  I have a problem with the new Ubuntu 12.10. It finished installing correctly, but when I restart my computer an error message appears: [15.854296] [drm: drm_crtc_helper_set_config] * error * failed to set mode on [CRTC: 10] * checking battery state [17.814209] [drm: drm_crtc_helper_set_config] * error * failed to set mode on [CRTC: 10] and that screen does not advance. I also tried booting from the recovery mode and it starts, but it's too slow loading windows and also shows me a window with an error message: Sorry Ubuntu 12.10 has experienced an internal error More Details: Executable path /usr/bin/xorg I have used Ubuntu since the 2008 version and never had this problem. I hope you can help me. Computer Specs: compaq sr2015la AMD sempron 2Gb. RAM 80Gb Hard Drive Translated from the original Spanish

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• Adding icon to the system tray (notification area)

  - by Moma Antero

  Hello, I have a small audio recording application programmed with GTK/GDK. (see picture). And I would like to add a tray-icon for it so users can control the application window and recording from it. Adding a tray icon: I have planned to use the GtkStatusIcon class for this task. Ref: http://library.gnome.org/devel/gtk/2.11/GtkStatusIcon.html Is GtkStatusIcon the recommended solution that also works in Ubuntu's Unity and in the GNOME 3.0 desktop? I already googled a bit and found a good example on GtkStatusIcon. Could I also use Libindicator for this task? Ref: https://launchpad.net/libindicator

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• Django admin, filter objects by ManyToMany reference

  - by Nick Z

  Hello! There's photologue application, simple photo gallery for django, implementing Photo and Gallery objects. Gallery object has ManyToMany field, which references Photo objects. I need to be able to get list of all Photos for a given Gallery. Is it possible to add Gallery filter to Photo's admin page? If it's possible, how to do it best?

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• Ubuntu 14.04 Fatal Exception

  - by user286534

  I use Ubuntu 14.04, 64-bit. I installed Virtualbox and was testing another Linux OS (Deepin). My system froze and I could not get to a TTY session to reboot. I had to do a hard restart and when Ubuntu restarted I got various error codes one of which was "kernel panic - fatal exception in interrupt" Booting to Advance mode and attempting repairs did not work (fsck, grub repair, etc) I reinstalled Ubuntu and chose the option to keep my files intact. I can now access my system but many programs I have installed do not work. My question is; I have a Deja-Dup backup (but only of my Home directory), is it better to restore my backup files or do I have to reinstall all of my programs? The weird thing is, the programs I verified using the Software Center to see if they were installed are checked as installed, but won't appear in Dash.

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• Is a 1:* write:read thread system safe?

  - by Di-0xide

  Theoretically, thread-safe code should fix race conditions. Race conditions, as I understand it, occur because two threads attempt to write to the same location at the same time. However, what about a threading model in which a single thread is designed to write to a location, and several slave/worker threads simply read from the location? Assuming the value/timing at which they read the data isn't relevant/doesn't hinder the worker thread's outcome, wouldn't this be considered 'thread safe', or am I missing something in my logic?

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• Cannot upgrade system because of this error

  - by user292375

  Setting up mongodb-org-server (2.6.1) ... * Starting database mongod [fail] invoke-rc.d: initscript mongod, action "start" failed. dpkg: error processing mongodb-org-server (--configure): subprocess installed post-installation script returned error exit status 1 No apport report written because MaxReports is reached already dpkg: dependency problems prevent configuration of mongodb-org: mongodb-org depends on mongodb-org-server; however: Package mongodb-org-server is not configured yet. dpkg: error processing mongodb-org (--configure): dependency problems - leaving unconfigured No apport report written because MaxReports is reached already Errors were encountered while processing: mongodb-org-server mongodb-org E: Sub-process /usr/bin/dpkg returned an error code (1)

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• Add objects to NSMutableArray

  - by iorf

  I'm trying to add objects to NSMutableArray (categoriasArray), but its not done by the iterator: @synthesize categoriasArray; for (int i = 0; i < [categories count]; i++) { categoria *cat = [[categoria alloc] initWithDictionary:[categories objectAtIndex:i]]; [self.categoriasArray addObject:cat]; cat=nil; } After the for iterator, categoriasArray has 0 objects. Many thanks

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• Implementing cache system in Java Web Application

  - by TGM

  I worked with JPA (Eclipselink implementation) and Hibernate. As I understand these two have great caching systems. I am interested in caching in a Web application and in order to better understand the process I'm trying to implement something on my own. Sadly, I cannot find any in depth documentation about this subject. I'm interested in things like high scalability, sharing memory on different machines and other important theoretical matters. Is there any tutorial or open project I could check out? Thank you! *LE: * I want to cache DB information in POJOs just like JPA or Eclipselink

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• Is System.Windows.Media.RenderCapability the wrong source to detect the current render-mode

  - by happyclicker

  I use System.Windows.Media.RenderCapability.Tier to show the current render mode within a diagnostics panel of my app. If I force the app to change the render-mode through the following code HwndSource hwndSource = PresentationSource.FromVisual(visual) as System.Windows.Interop.HwndSource; HwndTarget hwndTarget = hwndSource.CompositionTarget; hwndTarget.RenderMode = renderMode; neither System.Windows.Media.RenderCapability.TierChanged fires, nor has the System.Windows.Media.RenderCapability.Tier property changed. However the changes are applied to the app. If I look with Perforator, the render mode has been changed to the desired mode. Although I’ve found at many locations that System.Windows.Media.RenderCapability.Tier can be used to detect the current render state (also msdn, see this), it seems, System.Windows.Media.RenderCapability only gives information about the capabilities and not about the current mode. That makes also sense if I look at the name of the class. Is there another source to know how an actual wpf-content is rendered or am I doing something wrong?

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• How to build this encryption system that allows multiple users/objects.

  - by Patrick

  Hello! I am trying to figure out how to create an optimal solution for my project. I made this simple picture in Photoshop to try to illustrate the problem and how i want it (if possible). Illustrative image Ill also try to explain it based on the picture. First off we have a couple of objects to the left, these objects all get encrypted with their own encryption key (EKey on the picture) and then stored in the database. On the other side we have different users placed into roles (one user can be in a lot of roles) and the roles are associated with different objects. So one person only has access the to the objects that the role provides. So for instance Role A might have access to Object A and B. Role B have access only to Object C and Role C have access to all objects. Nothing strange in that, right? Different roles have different objects that they can access. Now to the problem part. Each user has to login with his/her username/password and then he/she gets access to the objects that his/her roles provide. All the objects are encrypted so she needs to get a decryption key somehow. I don't want to store the encryption key as a text string on the server. It should be, if possible, decrypted using the users password (along with the role) or similar. That way you have to be a user on the server in order to decrypt an object an to work with it. I was thinking about making a public/private key encryption system, but i am kinda stuck on how to give the different users the decryption key to the objects. Since i need to be able to move users to and from roles, add new users, add new roles and create/delete objects. There will be one administrator that then adds some data to allow the users in that role to get the decryption key to decrypt the object. Nothing is static and i am trying to get a picture of how this can be built or if there is a far better solution. The only criteria are: -Encrypted objects. -Decryption key should not be stored as text. -Different users have access to different objects. -Does NOT have to have roles.

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• How Content Management System is Useful

  Internet has open doors for small, medium as well as big business ventures to promote them online. The work of website development does not stop at mere web designing, but it has to be used best to i... [Author: Alan Smith - Computers and Internet - May 14, 2010]

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• Linux: Configure Xorg X11 Window System

  <b>nixCraft:</b> "My xorg.conf file is missing as I deleted accidentally for some reason. Now, Xorg try to probe my hardware on every startup. How do I configure Xorg under Debian or any Linux distro / operating systems?"

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• Secrets of Creating a Digital Marketing System For a Financial Management Firm

  A Financial Management firm can create a strong web presence by designing and developing a business website on the internet. However, this step alone is not a digital marketing plan. Just putting up a Financial Management firm website on the internet is similar to establishing a physical business like a shop or an office, and then just sitting back and waiting for the customers to flow in. More than likely, it will not happen and your website will resemble a billboard in the desert.

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• Implementing prototypes OR instantiating class objects

  - by intuited

  I'm wondering how to implement prototypal inheritance in Python. It seems like the way to do this would be to either use a metaclass to cause instantiations to actually be classes, rather than objects, or use some magical powers to transform an existing object into a class. The second method would seem to be more flexible, in that it could be applied to existing objects of varied types, while the first would likely be more convenient for typical use cases. Insights on the practicality of these two approaches, as well as alternative suggestions, are hereby requested.

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• What's the best way to store custom objects in relational database?

  - by user342610

  I have my objects with their properties. Objects could change their structure: properties may be added/removed/changed. Objects could be absolutely dropped. So object's metadata (description, classes, call them like you want :) )could be changed. The database should store objects schemas and instances of these objects. What's the best way to organise a relational database structure to store data mentioned above? Currently I see only two ways: 1) Store objects schemas in a few tables: schema general data,schema properties, possible properties types. Store instances in their tables: instance general data, a few tables - per each type from possible properties types table to store instance properties data. And so on. 2) store objects schemas like in p1 but store instances like XML files in one table: one table for general instance info and one table with instance XML. please, don't ask why/for what I need this. Just need to store custom objects and DB should work fast :)

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• How do you create a nested LINQ Grouping / Lookups for a Collection of Objects

  - by Jeff Windsor

  Given a list of objects with a date and decimal, I would like to index these objects by the year, month, dayofweek and hour of the date. In .NET 2.0, I would have created this graph using a set of nested dictionaries and a list as the leaf node. I am interested in how this could be done with LINQ.

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• the new distro ubuntu 12.10 has 2 system Bugs, reinstall the iso also exist [closed]

  - by sunpoison

  Possible Duplicate: How do I report a bug? discovered 2 bugs:: 1)cannot restart the computer when you click the top right icon power key "restart", it will stay on the splash image "ubuntu...",i wait for about 7 minutes and more, it also cannot restart, so, i have to uninstall the battery of the laptop...... 2)when i first update to the 12.10,not run for few hours, the "input method icon" on the top state bar is suddenly hide, when i use the shortcuts to switch the input method with "ctrl +space" it doesn' work at all, i restart the laptop, it can change the input method, but the state icon "a small keyboard icon is escape, i goto the "i bus" settings, but when i how to adjust it, the icon still can't display on the top bar (now i reinstall it use the iso file, this bug is fixed, but it cannot restart like the former one) it must has some problems of the "i bus" input method

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• Linux System Information Decoded

  <b>Linux Magazine:</b> "Linux systems include two native commands that tell you almost everything you need to know: dmidecode and biosdecode."

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