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  • Bit conversion operations in PHP

    - by Goro
    Hello, I find myself in need of performing bit-level conversion on variables in PHP. In more detail, I have a bit stream that is read as an integer by hardware, and I need to do some operations on the bits to make it into what its actually supposed to be (a float). I have to do this a few times for different formats, and the functionality I need is Being able to select and move individual bits in a variable Being able to cast statically one type of variable to the other (ie. int to float) I know php natively supports bitwise AND, OR, etc, and shift operations, but I was wondering if: there may already be a library in php that does this sort of thing I would be better off with delegating the calculations to some other language Thanks,

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  • Masking a bit in C returning unexpected result

    - by Eamorr
    0x7F000000 is 0111 1111 0000 0000 0000 0000 0000 0000 in 32 bit binary. 0x01000058 is 0000 0001 0000 0000 0000 0000 0101 1000. When I AND the two numbers together I expect 0000 0001 0000 0000 0000 0000 0000 0000, but for some reason I get 0. Here is my code: #define MASK_binop 0x80000000 #define MASK_operation 0x7F000000 int instruction=atoi(line); if((MASK_binop & instruction)>0) printf("binop\n"); else if((MASK_operation & instruction)>0) printf("operation\n"); Each of the above comparisons keeps returning zero. Is it something to do with 32/64 bits? I'm using 64-bit compiler.

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  • C++ bit shifting

    - by JB_SO
    Hi, I am new to working with bits & bytes in C++ and I'm looking at some previously developed code and I need some help in understanding what is going on with the code. There is a byte array and populating it with some data and I noticed that the data was being '&' with a 0x0F (Please see code snipped below). I don't really understand what is going on there....if somebody could please explain that, it would be greatly apperciated. Thanks! //Message Definition /* Byte 1: Bit(s) 3:0 = Unused; set to zero Bit(s) 7:4 = Message ID; set to 10 */ /* Byte 2: Bit(s) 3:0 = Unused; set to zero Bit(s) 7:4 = Acknowledge Message ID; set to 11 */ //Implementation BYTE Msg_Arry[2]; int Msg_Id = 10; int AckMsg_Id = 11; Msg_Arry[0] = Msg_Id & 0x0F; //MsgID & Unused Msg_Arry[1] = AckMsg_Id & 0x0F; //AckMsgID & Unused

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  • Pro/con of using Angular directives for complex form validation/ GUI manipulation

    - by tengen
    I am building a new SPA front end to replace an existing enterprise's legacy hodgepodge of systems that are outdated and in need of updating. I am new to angular, and wanted to see if the community could give me some perspective. I'll state my problem, and then ask my question. I have to generate several series of check boxes based on data from a .js include, with data like this: $scope.fieldMappings.investmentObjectiveMap = [ {'id':"CAPITAL PRESERVATION", 'name':"Capital Preservation"}, {'id':"STABLE", 'name':"Moderate"}, {'id':"BALANCED", 'name':"Moderate Growth"}, // etc {'id':"NONE", 'name':"None"} ]; The checkboxes are created using an ng-repeat, like this: <div ng-repeat="investmentObjective in fieldMappings.investmentObjectiveMap"> ... </div> However, I needed the values represented by the checkboxes to map to a different model (not just 2-way-bound to the fieldmappings object). To accomplish this, I created a directive, which accepts a destination array destarray which is eventually mapped to the model. I also know I need to handle some very specific gui controls, such as unchecking "None" if anything else gets checked, or checking "None" if everything else gets unchecked. Also, "None" won't be an option in every group of checkboxes, so the directive needs to be generic enough to accept a validation function that can fiddle with the checked state of the checkbox group's inputs based on what's already clicked, but smart enough not to break if there is no option called "NONE". I started to do that by adding an ng-click which invoked a function in the controller, but in looking around Stack Overflow, I read people saying that its bad to put DOM manipulation code inside your controller - it should go in directives. So do I need another directive? So far: (html): <input my-checkbox-group type="checkbox" fieldobj="investmentObjective" ng-click="validationfunc()" validationfunc="clearOnNone()" destarray="investor.investmentObjective" /> Directive code: .directive("myCheckboxGroup", function () { return { restrict: "A", scope: { destarray: "=", // the source of all the checkbox values fieldobj: "=", // the array the values came from validationfunc: "&" // the function to be called for validation (optional) }, link: function (scope, elem, attrs) { if (scope.destarray.indexOf(scope.fieldobj.id) !== -1) { elem[0].checked = true; } elem.bind('click', function () { var index = scope.destarray.indexOf(scope.fieldobj.id); if (elem[0].checked) { if (index === -1) { scope.destarray.push(scope.fieldobj.id); } } else { if (index !== -1) { scope.destarray.splice(index, 1); } } }); } }; }) .js controller snippet: .controller( 'SuitabilityCtrl', ['$scope', function ( $scope ) { $scope.clearOnNone = function() { // naughty jQuery DOM manipulation code that // looks at checkboxes and checks/unchecks as needed }; The above code is done and works fine, except the naughty jquery code in clearOnNone(), which is why I wrote this question. And here is my question: after ALL this, I think to myself - I could be done already if I just manually handled all this GUI logic and validation junk with jQuery written in my controller. At what point does it become foolish to write these complicated directives that future developers will have to puzzle over more than if I had just written jQuery code that 99% of us would understand with a glance? How do other developers draw the line? I see this all over Stack Overflow. For example, this question seems like it could be answered with a dozen lines of straightforward jQuery, yet he has opted to do it the angular way, with a directive and a partial... it seems like a lot of work for a simple problem. Specifically, I suppose I would like to know: how SHOULD I be writing the code that checks whether "None" has been selected (if it exists as an option in this group of checkboxes), and then check/uncheck the other boxes accordingly? A more complex directive? I can't believe I'm the only developer that is having to implement code that is more complex than needed just to satisfy an opinionated framework.

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  • Can we represent bit fields in JSON/BSON?

    - by zubair
    We have a dozen simulators talking to each other on UDP. The interface definition is managed in a database. The simulators are written using different languages; mostly C++, some in Java and C#. Currently, when systems engineer makes changes in the interface definition database, simulator developers manually update the communication data structures in their code. The data is mostly 2-5 bytes with bit fields for each signal. What I want to do is to generate one file from interface definition database describing byte and bit field definitions and let each developer add it to his simulator code with minimal fuss. I looked at JSON/BSON but couldn't find a way to represent bit fields in it. Thanks Zubair

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  • What's up with this reversing bit order function?

    - by MattyW
    I'm rather ashamed to admit that I don't know as much about bits and bit manipulation as I probably should. I tried to fix that this weekend by writing some 'reverse the order of bits' and 'count the ON bits' functions. I took an example from here but when I implemented it as below, I found I had to be looping while < 29. If I loop while < 32 (as in the example) Then when I try to print the integer (using a printBits function i've written) I seem to be missing the first 3 bits. This makes no sense to me, can someone help me out? int reverse(int n) { int r = 0; int i = 0; for(i = 0; i < 29; i++) { r = (r << 1) + (n & 1); n >>=1; } return r; }

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  • How to install Radeon 3670 HD graphics drivers for Ubuntu 10.04 64 bit with OpenGL 2.0 support?

    - by Daniel
    I've been having trouble with getting graphics drivers to work that support OpenGL 2.0. I've had some luck with the Ubuntu drivers, however these only support OpenGL 1.3. I thought I would document the methods that I have tried both to see if anyone else has ideas, and to save time for people with a similar problem. System details: Ubuntu 10.04 (Lucid) 64 bit Kernel Linux 2.6.32-44-generic GNOME 2.30.2 ATI Mobility Radeon HD 3670 Attempted Methods The methods I have tried are: 1. Installing Proprietary Drivers using the "Hardware Drivers" (Jockey) GUI This GUI offers an "ATI/AMD proprietary FGLRX graphics driver" however any attempts to install it result in a "Sorry, installation of this driver failed" error. The log file is here. There is an Ask Ubuntu question that covers this scenario, and notes that there is a known bug with Jockey. 2. Installing the Proprietary Drivers manually The answer to the question above linked to this wiki page, which gives instructions for installing Catalyst 12.6. This supported hardware list states that the 3670 is not supported in 12.6, and 12.4 must be used. This is somewhat confusing, as AMD's website suggests that the 12.6 driver should be installed for the 3670. There have been user reports that R600 (the GPU inside the 3670 card) doesn't work with 12.6, so I'm sticking with 12.4. I'm following these instructions to install the proprietary drivers on Lucid. I downloaded the 12.4 driver from the AMD website. Building the package worked fine, generating the fglrx, fglrx-dev, fglrx-amdcccle, and fglrx-modaliases deb packages successfully. However, when I try to install these using dpkg it gives me these errors. The make log referenced in the error is here. Ask Ubuntu References What is the correct way to install ATI Catalyst Video Drivers? Cannot install ATI/AMD FGLRX restricted graphic drivers Is my ATI graphics card supported in Ubuntu?

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  • SQL Server and the XML Data Type : Data Manipulation

    The introduction of the xml data type, with its own set of methods for processing xml data, made it possible for SQL Server developers to create columns and variables of the type xml. Deanna Dicken examines the modify() method, which provides for data manipulation of the XML data stored in the xml data type via XML DML statements. Too many SQL Servers to keep up with?Download a free trial of SQL Response to monitor your SQL Servers in just one intuitive interface."The monitoringin SQL Response is excellent." Mike Towery.

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  • Array manipulation in gsettings' set command

    - by Daniel
    Is there an easy way to do array manipulation in gsettings? I am comparing gsettings to OS X's defaults command that offers the defaults domain --array key overwrite-value and defaults domain --array-add key added-value interface for manipulating arrays. As far as I can tell there is only gsettings set domain key "['overwrite-value']" available to gsettings. Not really pretty for when you want to add or remove one entry from an array. I have seen a suggestion that allow me to add to an array, but I would rather use a interface if there is one.

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  • Add and Subtract 128 Bit Integers in C(++)

    - by Billy ONeal
    Hello :) I'm writing a compressor for a long stream of 128 bit numbers. I would like to store the numbers as differences -- storing only the difference between the numbers rather than the numbers themselves because I can pack the differences in fewer bytes because they are smaller. However, for compression then I need to subtract these 128 bit values, and for decompression I need to add these values. Maximum integer size for my compiler is 64 bits wide. Anyone have any ideas for doing this efficiently? Billy3

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  • SWT Windows64 bit

    - by Palani
    I am My application it throws the exception below. Exception in thread "main" java.lang.UnsatisfiedLinkError: Cannot load 32-bit SW T libraries on 64-bit JVM. How to solve this?what is the name of jar file needed?

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  • What advantage to I have if I use 64bit libraries?

    - by RadiantHex
    Hi folks, I see many people go crazy about 64bit libraries, and preferring them in general to the 32bit counter parts. I realise there is a lot of talk that gets lost in translation, and that the 64bit can be often over-valued. The setting is libraries that are called on web application, I'm aware that a new instance of the web app is generated for each hit. Therefore I'm thinking that 64bit is not necessary as the instances in no way surpass 2Gb of RAM usage. Help would be much appreciated! :)

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  • 64bit or 32bit Linux system?

    - by Milan Babuškov
    I have a server that has 4GB of RAM. On it, I have installation of 32bit Slackware Linux 12.1. Of course, it is not using all of 4GB of RAM. I'd soon like to increase the RAM to 8GB, and am looking for a way for the system to use it. The system is used as a database server and is under high load during the day. AFAICT, I have two options: stay with 32bit and rebuild the kernel and lose some performance. Or go with 64bit and reinstall everything. Looking at 64bit versions of Slackware, I could run -current or Slamd64. Now, on to the questions: Should I stay with 32bit or go with 64bit? If I go 64bit, should I use -current or Slamd64? P.S. I hope to get answers from someone actually using any of these configurations in production, not just copy/paste something I could find myself via Google.

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  • Running hardware with only 32bit drivers in 64bit windows

    - by Howard
    Recently we had to upgrade a system to handle added HD IP cameras. This upgrade involved an entirely new computer build with the exception of a rather pricey Geovision DVR (PCI/GV1480 series). Apparently while these cards do support Windows 7, they do not support Windows 7 x64. I'm stuck between a rock and a hard place here trying to figure out how we can remedy this, is there a virtualization solution that will allow devices with driver issues to passthru to the Guest OS? I was thinking XPMode may work for this solution however I am unsure if it runs 32bit or 64bit and if it'll allow driver-issue devices to pass to it. Any help would be greatly appreciated, Best Regards, Howard

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  • List total memusage by 32bit programs and 64bit programs

    - by egon
    How to get the total amount of memory used by 32bit applications and 64bit applications from the command line in Windows. I tried using tasklist /FI "MODULES eq wow64.dll" /FO CSV and then parsing the output and summing. But tasklist just freezes with any command that has something to do with modules (tasklist /m and tasklist /fi "modules eq wow64.dll" freeze). Are there any alternatives? Or some idea why tasklist freezes.

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  • Media Information for Constant and Variable bit rate of Video files

    - by cpx
    What is this Maximum bit rate for a .mp4 format file whose bit rate mode is Constant? Media information displayed for MP4 (Using MediaInfo Tool) ID : 1 Format : AVC Format/Info : Advanced Video Codec Format profile : [email protected] Format settings, CABAC : No Format settings, ReFrames : 1 frame Codec ID : avc1 Codec ID/Info : Advanced Video Coding Bit rate mode : Constant Bit rate : 1 500 Kbps Maximum bit rate : 3 961 Kbps Display aspect ratio : 4:3 Frame rate mode : Constant Frame rate : 29.970 fps Color space : YUV Chroma subsampling : 4:2:0 Bit depth : 8 bits Scan type : Progressive Bits/(Pixel*Frame) : 0.163 In this case where the bit rate mode is set to Variable, is the Bit rate field where the value is displayed as 309 is its average bit rate? Media information displayed for M4V (Using MediaInfo Tool) ID : 1 Format : AVC Format/Info : Advanced Video Codec Format profile : [email protected] Format settings, CABAC : No Format settings, ReFrames : 1 frame Codec ID : avc1 Codec ID/Info : Advanced Video Coding Bit rate mode : Variable Bit rate : 309 Kbps Display aspect ratio : 16:9 Frame rate mode : Variable Frame rate : 23.976 fps Minimum frame rate : 23.810 fps Maximum frame rate : 24.390 fps Color space : YUV Chroma subsampling : 4:2:0 Bit depth : 8 bits Scan type : Progressive Bits/(Pixel*Frame) : 0.229 Writing library : x264 core 120

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  • Windows 7 upgrade licensing

    - by bwerks
    I'm having trouble wading through Microsoft's marketing information. Does anyone know if Windows 7 x86 to Windows 7 x64 is a valid upgrade path? I know you can't actually use the built-in "upgrade" installation path; this is more of a licensing question. Although that may have answered my own question: is this idea even possible? Or do "upgrade" versions of Windows function only when executed from inside the OS, and not when doing fresh installs? Thanks!

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  • Running Java 32bit and 64bit on same computer

    - by Joris Meys
    I ran into a rather puzzling problem, trying to install Vuze 4.2.0.2 on my Windows 7. I have a Java 6 JDK 64bit, but Vuze complains that it can't find a correct 32bit JRE. Yet, as far as I know it shouldn't matter which Java is installed on the computer. (See also these answers). Now I was wondering : if it makes sense running a 32bit and a 64bit Java on the same machine, Whether that is possible, and if so what I should pay attention to in order to make sure that the correct Java is found. Thank you in advance PS : I have my reasons no to use the latest Vuze, so please don't tell me to update Vuze. I know.

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  • where.exe does not find OpenSSL libs when %ProgramFiles% variable is used in the PATH environment variable

    - by Piotr Dobrogost
    I installed both 32bit and 64bit version of OpenSSL libs on Vista x64. The 32bit version was installed in c:\Program Files (x86)\OpenSSL and the 64bit version was installed in c:\Program Files\OpenSSL. Then I added the entry %ProgramFiles%\OpenSSL to the PATH environment variable. %ProgramFiles%\OpenSSL is expanded to c:\Program Files (x86)\OpenSSL for 32bit programs and it's expanded to c:\Program Files\OpenSSL for 64bit programs. The idea is to have 32bit programs use 32bit version of OpenSSL libs and 64bit programs use 64bit version. I wanted to check if this works by running 32bit cmd.exe and issuing where ssleay32.dll and then by running 64bit cmd.exe and issuing the same. However in both cases I get the error INFO: Could not find files for the given pattern(s). What's wrong? This is a follow up to Different PATH environment variable for 32bit and 64bit Windows - is it possible?

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  • 32bit Application Memory Usage on 64bit Windows 7

    - by Brian
    I have an early 2012 Macbook Pro with and Intel I7 processor and 16 gigs RAM running Windows 7 Professional 64bit via Bootcamp. I work in Geographical Information Systems as a programmer so most of the applications I am running are 32bit Applications, but tend to use a lot of resources (i.e. ArcGIS, SQL Server Express, Visual Studio, etc.). I have been noticing that when I have multiple instances of either the same 32bit application or different 32bit applications and they are all working on hefty processing tasks, I am still only topping out at about 30% memory use. I understand 32bit applications are limited to less than 4gb RAM, but I assumed that one instance could use its own 4gb while another instance could use another 4gb to take full advantage of all the memory I have installed. Can anyone explain how this works and how I can get my applications to take advantage of all my memory via running multiple instances?

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  • Different PATH environment variable for 32bit and 64bit Windows - is it possible?

    - by Piotr Dobrogost
    Is it possible to have whole or part of PATH environment variable specific to the type of running process's image (32bit/64bit)? When I run some app from within 64bit cmd.exe I would like to have it pick the 64bit version of OpenSSL library whereas when I run some app from within 32bit cmd.exe I would like to have it pick the 32bit version of OpenSSL library. FOLLOW UP where.exe does not find OpenSSL libs when %ProgramFiles% variable is used in the PATH environment variable

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  • How to make an extremely old app run on 64bit Windows?

    - by Jerry Dodge
    I have a very old application designed for Windows 3.1. I have been able to use this application on Windows 7, however, that was Windows 7 32bit. Now I have since re-installed Windows to 64bit, and this application does not work, saying it's incompatible. I have tried running the application (and its other side-applications) in Windows '95 mode, but still the same message. How can I run this old app on 64bit Windows? For the record, the application is a game called "Sim Tower"

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  • Why is there no 64-bit Linux Firefox build?

    - by Legooolas
    It seems that I have to build my own 64-bit Firefox for Linux, as Mozilla won't support it until Firefox 4. Why is this? It looks to me as though it works fine, although without some of the speed improvements to the Javascript engine which the 32-bit version gets. (Edit: Yes I could run the 32-bit version but I'm trying to keep my system clear of 32-bit cruft and libraries etc, and all the plug-ins worked fine in 3.0.11 64-bit unofficial builds.) Update : No longer relevant as Mozilla provide 64-bit builds, but they don't show them on the download pages of mozilla.org, just on the ftp site as mentioned in one of the answers below.

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