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• Can Windows handle inheritance cross the 32-bit/64-bit boundary?

  - by TheBeardyMan

  Is it possible for a child process to inherit a handle from its parent process if one process is 32-bit and the other is 64-bit? HANDLE is a 64 bit type on Win64 and a 32 bit type on Win32, which suggests that even it were supposed to be possible in all cases, there would be some cases where it would fail: a 64-bit parent process, a 32-bit child process, and a handle that can't be represented in 32 bits. Or is naming the object the only way for a 32-bit process and a 64-bit process to get a handle for the same object?

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• Targetting x86 vs AnyCPU when building for 64 bit window OSes

  - by Mr Roys

  I have an existing C# application written for .NET 2.0 and targetting AnyCPU at the moment. It currently references some third party .NET DLLs which I don't have the source for (and I'm not sure if they were built for x86, x64 or AnyCPU). If I want to run my application specifically on a 64 bit Windows OS, which platform should I target in order for my app to run without errors? My understanding at the moment is to target: x86: If at least one third party .NET dll is built for x86 or use p/Invoke to interface with Win32 DLLs. Application will run in 32 bit mode on both 32 bit and 64 bit OSes. x64: If all third party .NET dlls are already built for x64 or AnyCPU. Application will only run in 64 bit OSes. AnyCPU: If all third party .NET dlls are already built for AnyCPU. Application will run in 32 bit mode on 32 bit OSes and 64 bit on 64 bit OSes. Also, am I right to believe that while targetting AnyCPU will generate no errors when building a application referencing third party x86 .NET DLLs, the application will throw a runtime exception when it tries to load these DLLs when it runs on a 64 bit OS. Hence, as long as one of my third party DLLs is doing p/Invoke or are x86, I can only target x86 for this application?

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• What is the maximum value of an unsigned 64-bit integer in English?

  - by Ben Aston

  What is the maximum value of an unsigned 64-bit integer in English?

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• How to install Canon MP610 printer on Ubuntu 12.04 x64

  - by Arkadius

  I installed Ubuntu 12.04 x64. Orginal Canon drivers are only for 32-bit version. How can I install this printer in 64-bit version ? Arkadius HERE IS SOLUTION I looked for solution some time and finally found it. First I try to do it by adding repository like it is written here: http://www.iheartubuntu.com/2012/02/install-canon-printer-for-ubuntu-linux.html BUT it did NOT work. Printer was installed but every print JOB goes somewhere ( probably to /dev/null :) ) Also installing sudo apt-get install ia32-libs did NOT worked (it was already installed) Finally I found solution. NOTE I did NOT use orginal Canon drivers for 32-bit. I also removed drivers from repository: ppa:michael-gruz/canon I found solution almost at the end of this thread: http://ubuntuforums.org/showthread.php?t=1967725&page=10 Most important hint was found in Response #97 "Do NOT install any PPA" I did as follows: Removed all copies of my printer Removed Canon drivers from repository ppa:michael-gruz/canon sudo apt-get remove cnijfilter* Added new repository and installed CUPS for Canon: sudo apt-add-repository ppa:robbiew/cups-bjnp sudo apt-get update sudo apt-get install cups-bjnp Installed Gutenprint: sudo apt-get install printer-driver-gutenprint Restarted CUPS: sudo restart cups Add myself to group lp: sudo usermod -G lp -a your_user_name Added printer usings steps from link above: Don't install any PPA for the drivers. Click the Cog up in the right-hand corner and select Printers. Turn on the printer and make sure it is connected. When the Printers windows appears, click +Add and wait a few minutes. Your printer should appear within the configuration wizard. Mine did and its an Canon MX330. Click the defaults and continue on. Cups should identify your printer. I saw a few other models in the list. I was able to successfully print a test page afterwards. I hope this will also help someone else. Arkadius .

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• Is it OK to remove appmenu-gtk and install appmenu-gtk:i386?

  - by medigeek

  I wanted to eliminate some skype errors and by installing the appmenu-gtk:i386 package the errors were gone! $ skype /usr/lib/gtk-2.0/2.10.0/menuproxies/libappmenu.so: wrong ELF class: ELFCLASS64 (skype:2841): Gtk-WARNING **: Failed to load type module: /usr/lib/gtk-2.0/2.10.0/menuproxies/libappmenu.so /usr/lib/gtk-2.0/2.10.0/menuproxies/libappmenu.so: wrong ELF class: ELFCLASS64 (skype:2841): Gtk-WARNING **: Failed to load type module: /usr/lib/gtk-2.0/2.10.0/menuproxies/libappmenu.so /usr/lib/gtk-2.0/2.10.0/menuproxies/libappmenu.so: wrong ELF class: ELFCLASS64 (skype:2841): Gtk-WARNING **: Failed to load type module: /usr/lib/gtk-2.0/2.10.0/menuproxies/libappmenu.so /usr/lib/gtk-2.0/2.10.0/menuproxies/libappmenu.so: wrong ELF class: ELFCLASS64 (skype:2841): Gtk-WARNING **: Failed to load type module: /usr/lib/gtk-2.0/2.10.0/menuproxies/libappmenu.so The change was easy: sudo apt-get install appmenu-gtk:i386 I haven't noticed any "weird" outcome (yet). The good thing was that it cleared the skype errors. But I have my doubts. Has anyone tried something similar? Removing appmenu-gtk and installing appmenu-gtk:i386 on a 64-bit system? Could it break any applications? Similar question: Resolving dependencies related to 32 bit libraries on 64 bit

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• 64-bit Cisco VPN client (IPsec) ?

  - by mika

  Cisco VPN client (IPsec) does not support 64bit Windows. Worse, Cisco does not even plan to release a 64-bit version, instead they say that "For x64 (64-bit) Windows support, you must utilize Cisco's next-generation Cisco AnyConnect VPN Client." Cisco VPN Client Introduction Cisco VPN Client FAQ But SSL VPN licences cost extra. For example, most new ASA firewalls come with plenty of IPSec VPN licences but only a few SSL VPN licences. What alternatives do you have for 64-bit Windows? So far, I know two: 32-bit Cisco VPN Client on a virtual machine NCP Secure Entry Client on 64-bit Windows Any other suggestions or experiences? -mika-

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• RHEL 6 x64: running 32 bit applications

  - by user54614

  We develop an application which currently works in 32 bit mode only. It worked fine in RHEL 5 but failed to work in RHEL 6. The reason is RHEL 6 by default is installed with 64 bit libraries only. Moreover, we didn't find a way to choose installation of 32bit runtime environment during or after system installation. Of course, we did find a way to install three rpm packages with 32 bit libraries required for our application to work. But it looks like unpleasant for our customers (we have to install three rpms from the DVD in the command line). So the question is: Is there a convenient way for RHEL 6 customers to install 32 bit libraries it their RHEL 6 system? Say, any user-friendly item in menu or a special command that install the same set of 32 bit system libraries that existed in RHEL 5? What are best practicies in such cases?

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• determine parity of a bit representation of a number in MIPS

  - by Hristo

  Is there some instruction in MIPS that will determine the parity of a certain bit representation? I know to determine whether a "number" has an even parity or an odd parity is to XOR the individual bits of the binary representation together, but that seems computationally-intensive for a set of MIPS instructions... and I need to do this as quick as possible. Also, the number I'm working in is represented in Grey Code... just to throw that in there. So is there some pseudo-instruction in MIPS to determine the parity of a "number" or do I have to do it by hand? If there is no MIPS instruction, which it seems very unlikely to be, any advice on how to do it by hand? Thanks, Hristo follow-up: I found a optimization, but my implementation isn't working. unsigned int v; // 32-bit word v ^= v >> 1; v ^= v >> 2; v = (v & 0x11111111U) * 0x11111111U; return (v >> 28) & 1;

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• Using datetime float representation as primary key

  - by devanalyst

  From my experience I have learn that using an surrogate INT data type column as primary key esp. an IDENTITY key column offers better performance than using GUID or char/varchar data type column as primary key. I try to use IDENTITY key as primary key wherever possible. But recently I came across a schema where the tables were horizontally partitioned and were managed via a Partitioned view. So the tables could not have an IDENTITY column since that would make the Partitioned View non updatable. One work around for this was to create a dummy 'keygenerator' table with an identity column to generate IDs for primary key. But this would mean having a 'keygenerator' table for each of the Partitioned View. My next thought was to use float as a primary key. The reason is the following key algorithm that I devised DECLARE @KEY FLOAT SET @KEY = CONVERT(FLOAT,GETDATE())/100000.0 SET @KEY = @EMP_ID + @KEY Heres how it works. CONVERT(FLOAT,GETDATE()) gives float representation of current datetime since internally all datetime are represented by SQL as a float value. CONVERT(FLOAT,GETDATE())/100000.0 converts the float representation into complete decimal value i.e. all digits are pushed to right side of ".". @KEY = @EMP_ID + @KEY adds the Employee ID which is an integer to this decimal value. The logic is that the Employee ID is guaranteed to be unique across sessions since an employee cannot connect to an application more than once at the same time. And for the same employee each time a key will be generated the current datetime will be unique. In all an unique key across all employee sessions and across time. So for Emp Ids 11 and 12, I have key values like 12.40046693321566357, 11.40046693542361111 But my concern whether float data type as primary key offer benefits compared to choosing GUID or char/varchar as primary keys. Also important thing is because of partitioning the float column is going to be part of a composite key.

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• Scala: Correcting type inference of representation type over if statement

  - by drhagen

  This is a follow-up to two questions on representation types, which are type parameters of a trait designed to represent the type underlying a bounded type member (or something like that). I've had success creating instances of classes, e.g ConcreteGarage, that have instances cars of bounded type members CarType. trait Garage { type CarType <: Car[CarType] def cars: Seq[CarType] def copy(cars: Seq[CarType]): Garage def refuel(car: CarType, fuel: CarType#FuelType): Garage = copy( cars.map { case `car` => car.refuel(fuel) case other => other }) } class ConcreteGarage[C <: Car[C]](val cars: Seq[C]) extends Garage { type CarType = C def copy(cars: Seq[C]) = new ConcreteGarage(cars) } trait Car[C <: Car[C]] { type FuelType <: Fuel def fuel: FuelType def copy(fuel: C#FuelType): C def refuel(fuel: C#FuelType): C = copy(fuel) } class Ferrari(val fuel: Benzin) extends Car[Ferrari] { type FuelType = Benzin def copy(fuel: Benzin) = new Ferrari(fuel) } class Mustang(val fuel: Benzin) extends Car[Mustang] { type FuelType = Benzin def copy(fuel: Benzin) = new Mustang(fuel) } trait Fuel case class Benzin() extends Fuel I can easily create instances of Cars like Ferraris and Mustangs and put them into a ConcreteGarage, as long as it's simple: val newFerrari = new Ferrari(Benzin()) val newMustang = new Mustang(Benzin()) val ferrariGarage = new ConcreteGarage(Seq(newFerrari)) val mustangGarage = new ConcreteGarage(Seq(newMustang)) However, if I merely return one or the other, based on a flag, and try to put the result into a garage, it fails: val likesFord = true val new_car = if (likesFord) newFerrari else newMustang val switchedGarage = new ConcreteGarage(Seq(new_car)) // Fails here The switch alone works fine, it is the call to ConcreteGarage constructor that fails with the rather mystical error: error: inferred type arguments [this.Car[_ >: this.Ferrari with this.Mustang <: this.Car[_ >: this.Ferrari with this.Mustang <: ScalaObject]{def fuel: this.Benzin; type FuelType<: this.Benzin}]{def fuel: this.Benzin; type FuelType<: this.Benzin}] do not conform to class ConcreteGarage's type parameter bounds [C <: this.Car[C]] val switchedGarage = new ConcreteGarage(Seq(new_car)) // Fails here ^ I have tried putting those magic [C <: Car[C]] representation type parameters everywhere, but without success in finding the magic spot.

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• Week in Geek: Official 64-Bit ‘Nightly Builds’ of Mozilla Firefox have been Discontinued

  - by Asian Angel

  Our last edition of WIG for November is filled with news link coverage on topics such as how Microsoft gave Windows 8 Pro to pirates by mistake, Nintendo warns against interrupting the Wii U update, a new trojan is using Google Docs to communicate with its control server, and more. Original wallpaper by hackSkillz, available at deviantART. Why Does 64-Bit Windows Need a Separate “Program Files (x86)” Folder? Why Your Android Phone Isn’t Getting Operating System Updates and What You Can Do About It How To Delete, Move, or Rename Locked Files in Windows

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• Ubuntu 12.04 64 bit doesn't work on a win7 with check point full disk encryption

  - by Victor Rodriguez

  I installed Ubuntu 12.04 64 bit with the Wubi installer on a Windows 7 with Check Point Full Disk Encryption. The Wubi Installer runs without any trouble selecting the compatibility mode with WinXP and as Administrator. The problem is that after the installation is complete and the reboot done, when you restart the system, there's no option to start Ubuntu instead of Windows. I recently installed Ubuntu on other Win7 machines without any problem. But those laptops don't have the Check Point Full Disk Encryption. And when you restart the system you have the option to start in Ubuntu. If somebody has resolved this issue please share...!!! Regards! Víctor

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• Sound driver for motherboard gigabyte ga-g1975x-c (Creative Sound Blaster Live 24-bit) (alsa, ca0106)

  - by Mikl

  My motherboard is gigabyte ga-g1975x-c with integrated audio "Creative Sound Blaster Live 24-bit". I have installed Ubuntu 10.10, and there was no sound at all. Alsa drivers was already installed. Finally after long searching, i have found how to make my sound work. /etc/modprobe.d/alsa-base.conf: options snd-ca0106 subsystem=0x10121102 //i have added this line and restart After restarting my speakers and microfon works fine. Maybe somebody knows different/better subsystem code for my sound card???

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• Oracle Database 11g Release 2 Now Available on 32-bit and x64 Windows

  - by jenny.gelhausen

  Oracle Database 11g Release 2 provides the foundation for IT to successfully deliver more information with higher quality of service, reduce the risk of change within IT, and make more efficient use of their IT budgets. By deploying Oracle Database 11g Release 2 as their data management foundation, organizations can utilize the full power of the world's leading database. Now Oracle Database 11g Release 2 is available for organizations using 32-bit and x64 Windows. Download either on OTN var gaJsHost = (("https:" == document.location.protocol) ? "https://ssl." : "http://www."); document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E")); try { var pageTracker = _gat._getTracker("UA-13185312-1"); pageTracker._trackPageview(); } catch(err) {}

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• Object Oriented programming on 8-bit MCU Case Study

  - by Calvin Grier

  I see that there's a lot of questions related to OO Programming here. I'm actually trying to find a specific resource related to embedded OO approaches for an 8 bit MCU. Several years back (maybe 6) I was looking for material related to Object Oriented programming for resource constrained 8051 microprocessors. I found an article/website with a case history of a design group that used a very small RAM part, and implemented many Object based constructs during their C design and development. I believe it was an 8051. The project was a success, and managed to stay inside the very small ROM/RAM they had available. I'm attempting to find it again, but Google can't locate it. The article was well written, and recommended a "mixed" approach using C methods for inheritance and encapsulation - if I recall correctly. Can anyone help me locate this article?

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• Utility Objects Series Introduction (but mostly a bit of an update)

  - by drsql

  So, I have been away from blogging about technical stuff for a  long time,  (I haven’t blogged at all since my resolutions blog , and even my Simple Talk “commentary” blog hasn’t had an entry since December!)  Most of this has been due to finishing up my database design book , which I will blog about at least one more time after it ships next month, but now it is time to get back to it certainly in a bit more regularly. For SQL Rally, I have two sessions, a precon on Database Design,...(read more)

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• genisoimage and exec bit preservation

  - by user92187

  Maybe I'm just not doing right, but I can't seem to get genisoimage to produce a UDF image and preserve the exec bit. $ genisoimage --version genisoimage 1.1.11 (Linux) $ echo "echo 'Hello world'" > script.sh $ chmod +x script.sh $ ./script.sh Hello world $ genisoimage -input-charset utf-8 -r -udf -volid minimal -o minimal.iso script.sh Total translation table size: 0 Total rockridge attributes bytes: 250 Total directory bytes: 0 Path table size(bytes): 10 Max brk space used 0 420 extents written (0 MB) $ mkdir mount $ sudo mount minimal.iso $PWD/mount -o ro,loop -t udf $ ls -l script.sh mount/script.sh -r--r--r-- 1 root root 19 Sep 21 18:40 mount/script.sh -rwxrwxr-x 1 kip kip 19 Sep 21 18:40 script.sh You'll note in the last command that script.sh was executable at the time it was injected into the image, but does not appear to be inside of the mounted image. Is this a bug in genisoimage, a problem with the way I am mounting the image, or a problem in my usage of genisoimage?

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• is mysql index useful on column 'state' when only doing bit-operations on the column?

  - by Geert-Jan

  I have a lot of domain entities (stored in mysql) which undergo lots of different operations. Each operation is executed from a different program. I need to keep (flow)-state for these entities which I implemented in as a long field 'flowstate' used as a bitset. to query mysql for entities which have undergone a certain operation I do something like: select * from entities where state >> 7 & 1 = 1 Indicating bit 7 (cooresponding to operation 7) has run. (<-- simplified) Anyway, I really didn't pay attention to the performance implications of this setup in the beginning, and I think I'm in a bit of trouble since queries as the above run pretty slow. What I'd like to know: Does an mysql index on 'flowstate' help at all? After all it's not a single value Mysql can quickly find using a binary sort or whatever. If it doesn't, are there any other things I could do to speed things up? . Are there special 'mask-indices' for fields with use-cases as the above? TIA, Geert-jan

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• 12.04 64 bit: Keybord not responding for about 20 seconds at startup/beginning of session

  - by Danilo

  I am running Ubuntu 12.04 64bit. When I get at the login screen and try to type the password for my user, I cannot type anything for about 20 seconds. After that, the keyboard starts responding and everything works fine. Mouse is responding normally as well as all buttons of the login interface (time/calendar, session selection (Unity/Unity 2D), etc.). What could be the reason for this behavior? How can I solve this temporary freeze of the keyboard so that I can type my password immediately without having to wait each time? Thanks for your time. EDIT: I tried auto login, but the problem is still there: the Desktop loads but even there, if I try to type something in the dash or anywhere else, I must wait about 20 seconds before I can actually start typing. Can the issue be related to some keyboard modules that get loaded little bit "too late"?

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• HLSL: Pack 4 values into 32 bit float.

  - by TheBigO

  I can't find any useful information on packing 4 values into a 32 bit float in HLSL. Ideally, what I want to be able to do in HLSL is: float4 values = ... // Some values where each component is between 0 and 1. float packedValues = pack32R(values); float4 values2 = unpack32R(packedValues); I realize that there will be precision limitations, and performance tradeoffs between different precisions in different methods. I'm just wondering what ideas are out there.

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• Utility Objects Series Introduction (but mostly a bit of an update)

  - by drsql

  So, I have been away from blogging about technical stuff for a  long time,  (I haven’t blogged at all since my resolutions blog , and even my Simple Talk “commentary” blog hasn’t had an entry since December!)  Most of this has been due to finishing up my database design book , which I will blog about at least one more time after it ships next month, but now it is time to get back to it certainly in a bit more regularly. For SQL Rally, I have two sessions, a precon on Database Design,...(read more)

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• Can't single boot Ubuntu 13.04 64 bit

  - by stanleyhunk

  I'm new to Ubuntu, I bought an Asus A45VS laptop recently pre-installed with Windows 8, but I have already uninstalled it and wipef the whole HDD. I plan to install Ubuntu 13.04 64 bit on it. I have tried several times to install and uninstall Ubuntu again and again with boot-able USB, but it still fail to boot. All the installation process go fine, after rebooting my laptop, it just stick to the purple screen. Then I boot it with USB again, tried boot-repair, tried make an EFI partition, still the same. I have searched on the web, and all of them was about dual booting with windows 7 or windows 8, I don't wish to do dual booting as I wish to have single OS which is Ubuntu on this laptop. please help, thanks in advance.

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• La Libye coupe ses accès Internet, certains craignent l'indisponibilité des URL réduites de bit.ly

  La Libye coupe ses accès Internet, certains craignent l'indisponibilité des URL réduites de bit.ly On ne rigole plus en Libye. Le pays, soulevé depuis quelques jours par les opposants au régime politique en place, est de plus en plus agité. Face à cela, le pouvoir libyen craint de voir arriver la même issue qu'en Egypte. Aussi, depuis vendredi, le réseau social Facebook n'est plus accessible dans le pays. Mais ce n'est pas tout. Muammar Kadhafi a également demandé une coupure de l'Internet local, et le dirigeant ne s'adresse plus aux médias. Puis, la Toile a été accessible par intermittences : quelques fois, les sites sont lents, d'autres fois, ils sont inaccessibles. Apparemment, une embellie aurait...

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• Ubuntu 12.04 LTS Desktop 64 bit user permissions or apache2 rewrite problem

  - by mtm

  have installed 12.04 Desktop 64 bit, manually installed LAMP, phpmyadmin, php5-dev,PEAR, PECL, apc, ssh, created user to own /var/www/ and transferred 3 sites to /www/. sites are in subfolders, sites - available all configured, and enabled. One site is pure html, two athers - php. Enabled curl, but phpmyadmin started at first, also php sites, than stopped working /show blank pages/ sites said Clean urls cannot be enabled. Html site still working. Where is the problem, and why the php sites stop working? In all apache .conf files Allow Override is set to ALL. php sites have .htaccess files. And this configuration worked with Ubuntu 10.04.

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• Using a Higher Precision (than 8-bit unsigned integer) Buffered Image for Heightmaps in Java

  - by pl12

  I am generating a heightmap for every quad in my quadtree in openCL. The way I was creating the image is as follows: DataBufferInt dataBuffer = (DataBufferInt)img.getRaster().getDataBuffer(); int data[] = dataBuffer.getData(); //img is a bufferedimage inputImageMem = CL.clCreateImage2D( context, CL_MEM_READ_WRITE | CL_MEM_USE_HOST_PTR, new cl_image_format[]{imageFormat}, size, size, size * Sizeof.cl_uint, Pointer.to(data), null); This works ok but the major issue is that as the quads get smaller and smaller the 8-bit format of the buffered image starts to cause intolerable "stepping" issues as seen below: I was wondering if there was an alternate way I could go about doing this? Thanks for the time.

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