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• Windows Phone 7 v. Windows 8 Metro &ldquo;Same but Different&rdquo;

  - by ryanabr

  I have been doing development on both the Windows Phone 7 and Windows 8 Metro style applications over the past month and have really been enjoying doing both. What is great is that Silverlight is used for both development platforms. What is frustrating is the "Same but Different" nature of both platforms. Many similar services and ways of doing things are available on both platforms, but the objects, namespaces, and ways of handling certain cases are different. I almost had a heart attack when I thought that XmlDocument had been removed from the new WinRT. I was relived (but a little annoyed)  when I found out that it had shifted from the "System.Xml" namespace to the "Windows.Data.Xml.Dom" namespace. In my opinion this is worse than deprecating and reintroducing it since there isn't the lead time to know that the change is coming, maker changes and adjust. I also think the breaks the compatibility that is advertised between the WinRT and .NET framework from a programming perspective, as the code base will have to be physically different if compiled for one platform versus the other. Which brings up another issue, the need for separate DLLs with for the different platforms that contain the same C# code behind them which seems like the beginning of a code maintenance headache. Historically, I have kept source files "co-located" with the projects that they are compiled into. After doing some research, I think I will end up keeping "common" files that need to be compiled in to DLLs for the different platforms in a seperate location in TFS, not directly included in any one Visual Studio project, but added as links in the project that would get compiled into the windows 7 phone, or Windows 8. This will work fine, except for the case where dependencies don't line up for each platform as described above, but will work fine for base classes that do the raw work at the most basic programming level.

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• How are the conceptual pairs Abstract/Concrete, Generic/Specific, and Complex/Simple related to one another in software architecture?

  - by tjb1982

  (= 2 (+ 1 1)) take the above. The requirement of the '=' predicate is that its arguments be comparable. Any two structures are comparable in this case, and so the contract/requirement is pretty generic. The '+' predicate requires that its arguments be numbers. That's more specific. (socket domain type protocol) the arguments here are much more specific (even though the arguments are still just numbers and the function itself returns a file descriptor, which is itself an int), but the arguments are more abstract, and the implementation is built up from other functions whose abstractions are less abstract, which are themselves built from less and less abstract abstractions. To the point where the requirements are something like move from one location to another, observe whether the switch at that location is on or off, turn the switch on or off, or leave it the same, etc. But are functions also less and less complex the less abstract they are? And is there a relationship between the number and range of arguments of a function and the complexity of its implementation, as you go from more abstract to less abstract, and vice versa? (= 2 (+ 1 1) 2r10) the '=' predicate is more generic than the '+' predicate, and thus could be more complex in its implementation. The '+' predicate's contract is less generic, and so could be less complex in its implementation. Is this even a little correct? What about the 'socket' function? Each of those arguments is a number of some kind. What they represent, though, is something more elaborate. It also returns a number (just like the others do), which is also a representation of something conceptually much more elaborate than a number. To boil it down, I'm asking if there is a relationship between the following dimensions, and why: Abstract/Concrete Complex/Simple Generic/Specific And more specifically, do different configurations of these dimensions have a specific, measurable impact on the number and range of the arguments (i.e., the contract) of a function?

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• syslog facilities

  - by user65971

  Hi, I have an application (in java) running in a windows PC and I want to send logging messages to a syslog server running in a linux box somewhere in the network. The problem I have is, that it is not clear to me what should I use as facility in this case. I.e. can I (/should I) send the logging info as one of LOCAL0-LOCAL7? Or are they not supposed to be used by remote applications? It is not clear to me if they are usable or not. Should I use USER instead? Could anyone help me on this please? Thank you

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• Access to a network server without port forwarding

  - by SdevDavid

  I have a network with the following structure. The server in PC2 is simple socket server TCP in 8080 port. I need to access to PC2 from other external network by socket client. This socket client knows the public IP (85.xxx.xxx.x), the private IP (192.168.0.21) and the port. How I can access PC2 without port forwarding on the router? If possible, I would like to have a reference in any programming language of this case.

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• How should I structure the implementation of turn-based board game rules?

  - by Setzer22

  I'm trying to create a turn-based strategy game on a tilemap. I'm using design by component so far, but I can't find a nice way to fit components into the part I want to ask. I'm struggling with the "game rules" logic. That is, the code that displays the menu, allows the player to select units, and command them, then tells the unit game objects what to do given the player input. The best way I could thing of handling this was using a big state machine, so everything that could be done in a "turn" is handled by this state machine, and the update code of this state machine does different things depending on the state. However, this approach leads to a large amount of code (anything not model-related) going into a big class. Of course I can subdivide this big class into more classes, but it doesn't feel modular and upgradable enough. I'd like to know of better systems to handle this in order to be able to upgrade the game with new rules without having a monstruous if/else chain (or switch / case, for that matter). Any ideas? What specific design pattern other than MVC should I be using?

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• Varnish cache and PHP session; setting header?

  - by StCee

  Varnish by default would not cache page with cookies. I read on some posts that one workaround for PHP pages is to set header('Cache-Control: public, s-maxage=60'); in php pages. But would it makes Varnish cache the page with the session cookie? Session is started on that page, and although there is nothing personal on that page, I would still want the session to persist in case the user would do something private later. So is there a way to cache the page without the session cookie? And still be able to pass session between pages? I can imagine some sort of weird solution with hidden form, but I would prefer if it can be done with VCL configuration or header setting. Thanks a lot!

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• How to efficiently restore Library folder partially deleted on OS X

  - by flow

  I am using OS X Lion, and trying to delete some files I did accidentally (from home directoy): rm -fr Library I realized about this some 15 seconds later and did killall rm Some folders have been deleted, of course, inside "Library". Now the system seems to be ok, but I fear what will happen in case of reboot. I have a Time Machine backup from 5 days ago. I wonder if it would be a good solution, just to copy whole "Library" folder from my home directory from backup and replace this one. Or, what do you think would be the best approach? PS: In order to restore just deleted directories inside "Library", in which order does "rm" start to delete directories, alphabetically?

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• How to build a "traffic AI"?

  - by Lunikon

  A project I am working on right now features a lot of "traffic" in the sense of cars moving along roads, aircraft moving aroun an apron etc. As of now the available paths are precalculated, so nodes are generated automatically for crossings which themselves are interconnected by edges. When a character/agent spawns into the world it starts at some node and finds a path to a target node by means of a simply A* algorithm. The agent follows the path and ultimately reaches its destination. No problem so far. Now I need to enable the agents to avoid collisions and to handle complex traffic situations. Since I'm new to the field of AI I looked up several papers/articles on steering behavior but found them to be too low-level. My problem consists less of the actual collision avoidance (which is rather simple in this case because the agents follow strictly defined paths) but of situations like one agent leaving a dead-end while another one wants to enter exactly the same one. Or two agents meeting at a bottleneck which only allows one agent to pass at a time but both need to pass it (according to the optimal route found before) and they need to find a way to let the other one pass first. So basically the main aspect of the problem would be predicting traffic movement to avoid dead-locks. Difficult to describe, but I guess you get what I mean. Do you have any recommendations for me on where to start looking? Any papers, sample projects or similar things that could get me started? I appreciate your help!

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• Hard drive skipped in boot

  - by Yasin

  Good evening. I just installed Ubuntu 12.04 using a USB, but right after the install, after restarting the machine, I get a message asking me to insert a bootable drive. My boot settings in Bios have the hard drive first, then DVD, then USB stick, and I have two systems installed, Windows 7 and Ubuntu 12.04. I suspected the hard drive got somehow disconnected internally, so I checked but everything was in place. I used the live USB to start Ubuntu, and I could see the hard drive and mount whatever partition I wanted. The one that contains the recently installed Ubuntu, looks the same. (It hasn't been deleted or anything). I'm not sure if this is a hardware problem or a loader(grub) problem, because the hard drive is visible. Only it isn't seen by the BIOS. My only means of internet connection is a USB modem, which doesn't work when I'm using the live USB, so I have can't download anything from the internet, in case someone asks. I also reinstalled Ubuntu 12.04, to no avail. This is my second problem with this laptop, and Ubuntu, and it's not even a week old. I hope this one gets solved. Thank you.

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• Can I install fresh Linux accross partitions (LUKS & LVM) and preserve/use existing home user?

  - by xtian

  With an existing LUKS encrypted logical volume partitioned hard disk dual boot to Windoz and Linux (Fedora 15), is it necessary to "start over" with the LUKS setup when upgrading the system? I recall some note about dividing the Linux installation over different partitions would help to preserve the home data in future update (I can't find this now) Before I try it, is this possible and intended use case for partitioning a Linux installation? # lsblk -fa NAME FSTYPE LABEL MOUNTPOINT sda [80G] +-sda1 [system W95 FAT 32] vfat +-sda2 ext4 /boot +-sda3 [52.4G] crypto_LUKS +-luks-de25ac97-6a32-4b79-a6a0-296a39376b3b (dm-0) LVM2_member +-cryptVG-root (dm-1) [21.5G] ext4 / +-cryptVG-swap (dm-2) [5.4MB] swap [SWAP] +-cryptVG-data (dm-3) [25.6G] ext4 /home

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• How can I redirect HTTPS(S) traffic to anothr gateway?

  - by PsyStyle

  I have a network like 192.168.0.0/15 with the default gateway set to 192.168.0.1. Al the workstations of the network use this gateway for all kind of accesses to the Internet. Now I am testing a new Internet connection with another provider and for this I am using a second gateway on the same subnet with 192.168.0.2 as IP address. I want to redirect only HTTP and HTTPS traffic to this second gateway without touching the address of the default gateway set inside every workstation. How can I accomplish this task? What I have to change inside the first's gateway firewall configuration or routes? I tried with a dnat like DNAT loc:192.168.0.1 loc:192.168.0.2 tcp 80 but nothing worked. I use Shorewall for simplicity in configuration but I can understand even theorical answers which I will try to adapt to my case

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• Make nginx avoid cache if response contains Vary Accept-Language

  - by gioele

  The cache module of nginx version 1.1.19 does not take the Vary header into account. This means that nginx will serve the same request even if the content of one of the fields specified in the Vary header has changed. In my case I only care about the Accept-Language header, all the others have been taken care of. How can I make nginx cache everything except responses that have a Vary header that contains Accept-Language? I suppose I should have something like location / { proxy_cache cache; proxy_cache_valid 10m; proxy_cache_valid 404 1m; if ($some_header ~ "Accept-Language") { # WHAT IS THE HEADER TO USE? set $contains_accept_language # HOW SHOULD THIS VARIABLE BE SET? } proxy_no_cache $contains_accept_language proxy_http_version 1.1; proxy_pass http://localhost:8001; } but I do not know what is the variable name for "the Vary header received from the backend".

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• Error installing SQL Server 2005 Express on AMD Turion?

  - by Angel

  Hello. Is there some compatibility problem between SQL Server 2005 Express and AMD processors? I read something along those lines on various sites, but found nothing 100% definitive. I am trying to install SQL Server 2005 Express on a computer that runs Windows Vista Home Premium, 32-bit edition, and the CPU is "AMD Turion Dual-Core RM-70". I tried both the 32-bit and 64-bit installers, just in case, and the process runs fine until the moment the service attempts to start, where it fails with the same error every time. I'm sorry I can't provide more details or the exact message, it was on a client computer to which I have no access at the moment. I hope someone could shed some light on this. Thank you.

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• Custom prompt doesn't work on Mac Terminal

  - by mareks

  I like to use a custom prompt (current path in blue) on my unix machine: export PS1='\[\e[0;34m\]\w \$\[\e[m\] ' But when I try to use it on Mac's terminal it doesn't work: it fails to detect the end of the prompt and overwrites the prompt when I type commands. This also happens when I'm inputting a long command where it wraps over the same line instead of starting a new line. I don't understand why this is the case since I use bash on both machines. Any suggestions on how to remedy this?

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• How to match responses from a server with their corresponding requests? [closed]

  - by Deele

  There is a server that responds to requests on a socket. The client has functions to emit requests and functions to handle responses from the server. The problem is that the request sending function and the response handling function are two unrelated functions. Given a server response X, how can I know whether it's a response to request X or some other request Y? I would like to make a construct that would ensure that response X is definitely the answer to request X and also to make a function requestX() that returns response X and not some other response Y. This question is mostly about the general programming approach and not about any specific language construct. Preferably, though, the answer would involve Ruby, TCP sockets, and PHP. My code so far: require 'socket' class TheConnection def initialize(config) @config = config end def send(s) toConsole("--> #{s}") @conn.send "#{s}\n", 0 end def connect() # Connect to the server begin @conn = TCPSocket.open(@config['server'], @config['port']) rescue Interrupt rescue Exception => detail toConsole('Exception: ' + detail.message()) print detail.backtrace.join('\n') retry end end def getSpecificAnswer(input) send "GET #{input}" end def handle_server_input(s) case s.strip when /^Hello. (.*)$/i toConsole "[ Server says hello ]" send "Hello to you too! #{$1}" else toConsole(s) end end def main_loop() while true ready = select([@conn, $stdin], nil, nil, nil) next if !ready for s in ready[0] if s == $stdin then return if $stdin.eof s = $stdin.gets send s elsif s == @conn then return if @conn.eof s = @conn.gets handle_server_input(s) end end end end def toConsole(msg) t = Time.new puts t.strftime("[%H:%M:%S]") + ' ' + msg end end @config = Hash[ 'server'=>'test.server.com', 'port'=>'2020' ] $conn = TheConnection.new(@config) $conn.connect() $conn.getSpecificAnswer('itemsX') begin $conn.main_loop() rescue Interrupt rescue Exception => detail $conn.toConsole('Exception: ' + detail.message()) print detail.backtrace.join('\n') retry end

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• Store system passwords with easy and secure access

  - by CodeShining

  I'm having to handle several VPS/services and I always set passwords to be different and random. What kind of storage do you suggest to keep these passwords safe and let me access them easily? These passwords are used for services like databases, webserver user and so on that run customers' services, so it's really important to keep them in a safe place and strong. I'm actually storing them in a google drive spreadsheet file, describing user, password, role, service. Do you know of better solutions? I'd like to keep them on a remote service to make sure I don't have to make backup copies (in case my hdd would fail somehow). I do work on *nix platforms (so windows specific solutions are not a choice here).

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• How can one create a bootable linux usb key that works on Mac (Intel 64 bit CPU) hardware ?

  - by user3621

  Hi, I'm trying to create a bootable usb key with linux (debian) and that can be booted on Macintel hardware. I have read that MAC's EFI can only boot GPT GUID formatted disks. I'm desperately trying to find a good tutorial which explains how to create such a key. Here what I have done so far: create a GUID partition on te key using linux GNU parted create a HFS+ or ext3 partition on the key, with the boot flag on install a linux .iso with unetbootin While all steps were successfull and in some cases I could even boot on a PC, the step of booting on Macintel software failed (on a macbook). I need to precise that I holded the "alt" key while booting the mac and the only visible bootable disk was the hard disk. Thanks for any advice. PS: I have tried with rEFIt as well. In one case I had a "windows" icon but it then failed to boot with a message like "no system found"

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• Mouse pointer size inconsistent

  - by charon00

  Since installing Ubuntu 12.04, I've been having a problem with the mouse pointer size. On the desktop, it is quite a bit larger than it should be (24), though the different cursors (editing text, hyperlink hand, etc) are correct. The size changes to the correct size when the pointer is over some application windows (GVim, Netbeans, Firefox), but then changes back once it is moved out of the window. There was a similar question here, but the Xdefaults solution did not work for me, and I didn't want to try the one requiring editing the icon image. In addition, I've tried changing the cursor theme using sudo update-alternatives --config x-cursor-theme as well as using the dconf-editor, but though I can change the theme, the size issue remains. In case it's relevant, I'm running on a dual-screen setup with monitor sizes of 2560x1600 and 1920x1080, using the NVidia video driver. Is there another way to control pointer size, or a setting that might be messing it up? EDIT: These are the values/options I have for update-alternatives and in dconf-editor. I'm now wondering if Netbeans and Firefox are making the mouse pointer smaller than it should be, but I'm not sure how big 24 should be... update-alternatives: Selection Path Priority Status ------------------------------------------------------------ 0 /usr/share/icons/DMZ-White/cursor.theme 90 auto mode 1 /etc/X11/cursors/core.theme 30 manual mode 2 /etc/X11/cursors/handhelds.theme 20 manual mode 3 /etc/X11/cursors/redglass.theme 20 manual mode 4 /etc/X11/cursors/whiteglass.theme 20 manual mode * 5 /usr/share/icons/DMZ-Black/cursor.theme 30 manual mode 6 /usr/share/icons/DMZ-White/cursor.theme 90 manual mode dconf-editor: I can't post the image since I'm a new user but the cursor-size is set to 24 and the cursor-theme is DMZ-Black.

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• Disk Management

  - by Mars

  I'd like to know what's with all those unnamed drives. I've always thought they are what they say they are (recoveries and what not), why are there so many of them? and why do they all say 100% Free (i.e. they're all empty!). If that's the case, what happened to my recovery? Info: I'm on Dell Inspiron 7520 Windows 8 Single Language (Had Kali installed on SSD a couple of days ago, now I've just deleted that and will install Kali on VM on SSD, that's drive (S:). Screenshot (don't have enough reputation): https://www.dropbox.com/s/y8a1mfkycd5grhq/Screenshot%202014-06-08%2012.06.38.png

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• How to add network printer remotely without knowing the IP?

  - by Steve

  Assume your friend from over 100km away asked you to add a network printer to his computer since you're so tech savvy. How would you add network printer remotely in this case? You would need: 0. Remote connection to your friend's computer 1. Printer IP and brand/model names 2. Respective drivers downloaded either from manufacturer's website or Windows Update driver Question is, how would you find out the IP address of the printer without bothering your friend too much with technical steps? Since your friend isn't as tech savvy as you - they wouldn't know which buttons to press to get IP address.

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• How to persuade C fanatics to work on my C++ open source project?

  - by paperjam

  I am launching an open-source project into a space where a lot of the development is still done Linux-kernel-style, i.e. C-language with a low-level mindset. There are multiple benefits to C++ in our space but I fear those used to working in C will be scared off. How can I make the case for the benefits of C++? Specifically, the following C++ attributes are very valuable: concept of objects and reference-counting pointers - really don't want to have to malloc(sizeof(X)) or memcpy() structs templates for specialising whole bodies of code with specific performance optimizations and for avoiding duplication of code. template metaprogramming related to the above syntactic sweetness available (e.g. operator overloading, to be used in very small doses) STL Boost libraries Many of the knee-jerk negative reactions to C++ are illfounded. Performance does not suffer: modern compilers can flatten dozens of call stack levels and avoid bloat through wide use of template specializations. Granted, when using metaprogramming and building multiple specializations of a large call tree, compile time is slower but there are ways to mitigate this. How can I sell C++?

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• how to proxy sql queries (INSERT, UPDATE e.t.c.)

  - by XakRu

  I have installed cluster MYSQL (galley with mariadb) As an application server installed Apache. on a server with Apache installed haproxy which proxies requests from php in this case installed for zabbix server cluster. But faced with deadlocks, now I want to proxy requests WRITE, INSERT, UPDATE to the second server. SELECT queries to the second and third server. I would be happy to see your suggestions. Please do not write: use mysql - proxy. I want to see what program it may to proxy SQL requests. scheme: http://www.gliffy.com/pubdoc/4474830/L.png

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• How to setup Microsoft Remote Desktop?

  - by jsoldi

  I'm trying to establish a connection between this app and my Win 8.1 Pro PC, but every guide I've found so far skip steps such as what to put under PC name or under Gateway. Also, should the User name be my email or something else? I've also no idea how to find or add a user in the step 6 of this guide because the only location listed is my PC and I don't even know what am I supposed to search for. I'm not even sure whether I have to add a user or this is an step I can skip. A comprehensive guide for people without experience in networking would be highly appreciated. Both my android tablet and PC are connected to the internet through a home router, in case this matters.

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• connected ethernet without disabling wireless, now I have *two* LAN ip's?

  - by peter karasev

  Ok I'm on ubuntu 11.04, not too knowledgeable about network stuff. Usually people ask things like "wired works but wireless does not!". In m y case, I'm just curious about what it means to have both of them seemingly connected. In 'ipconfig' in shell I see that I have 192.168.1.2 for the wireless AND 192.168.1.3 for the ethernet. What does this mean for applications, does one of the two get precedence? It seems like my pages load slightly faster, so perhaps the ethernet is being used, but I could be imagining the speedup...

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• iPhone and Mac Twitter App Not Parsing HTML in Feeds

  - by otakrosak

  I've come across this problem where my tweets on the iPhone and Mac Twitter app are not parsing the HTML properly. In any browser, the HTML is parsed fine. It only happens to the apostrophe character (') and on the iPhone and Mac Twitter app. Also, I'm using the dlvr.it service to push my Drupal blog posts to my Twitter feed. My initial guess was that it was the RSS generated by Drupal, but if that were the case, then the feed displayed on the browser would be affected too. Any ideas anyone? Any help would be very much appreciated. P.S: I apologize beforehand if this question already exists. I did search for it but based on what I queried, nothing came up.

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