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  • Writing generic code when your target is a C compiler

    - by enobayram
    I need to write some algorithms for a PIC micro controller. AFAIK, the official tools support either assembler or a subset of C. My goal is to write the algorithms in a generic and reusable way without losing any runtime or memory performance. And if possible, I would like to do this without increasing the development time much and compromising the readability and maintainability much either. What I mean by generic and reusable is that I don't want to commit to types, array sizes, number of bits in a bit field etc. All these specifications, IMHO, point to C++ templates, but there's no compiler for it for my target. C macro metaprogramming is another option, but, again my opinion, that greatly reduces readability and increases development time. I believe what I'm looking for is a decent C++ to C translator, but I'd like to hear anything else that satisfies the above requirements. Maybe a translator from another high-level language to C that produces very efficient code, maybe something else. Please note that I have nothing against C, I just wish templates were available in it.

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  • Video codec that can be read on clean installs of either Windows, OS X and Ubuntu

    - by fmercille
    I have to make a video that will need to be watched on different operating systems. Is there a "universal" video codec that can be played on Windows, OS X and Linux without requiring additional plugins or player other than those that comes on a default clean install of each of those systems? Compression is not an issue, I'm merely looking for compatibility (e.g. for audio, I would use WAV as a universal codec). Note : I must assume that the video will be distributed in countries where software patents are enforced, and therefore can't rely on the user to install non-free codecs on Linux. Thanks.

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  • iptables, allow access from certain MAC addresses

    - by user788171
    Presently, I limit which clients can access my server by using IP addresses via iptables, only approved IP addresses can connect. However, the problem with this is if a client is on a laptop and goes to a different location, they can no longer connect because the IP has changed. For a variety of reasons, iptables authentication is the only option I have. Is there a way to restrict access by device instead of ip address. For instance, only allow certain MAC address to connect to port 5000. Is it possible to do this via iptables? Note, the computers are not on the same network, they could be connecting from anywhere in the world.

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  • Who should have full visibility of all (non-data) requirements information?

    - by ebyrob
    I work at a smallish mid-size company where requirements are sometimes nothing more than an email or brief meeting with a subject matter manager requiring some new feature. Should a programmer working on a feature reasonably expect to have access to such "request emails" and other requirements information? Is it more appropriate for a "program manager" (PGM) to rewrite all requirements before sharing with programmers? The company is not technology-centric and has between 50 and 250 employees. (fewer than 10 programmers in sum) Our project management "software" consists of a "TODO.txt" checked into source control in "/doc/". Note: This is nothing to do with "sensitive data access". Unless a particular subject matter manager's style of email correspondence is top secret. Given the suggested duplicate, perhaps this could be a turf war, as the PGM would like to specify HOW. Whereas WHY is absent and WHAT is muddled by the time it gets through to the programmer(s)... Basically. Should specification be transparent to programmers? Perhaps a history of requirements might exist. Shouldn't a programmer be able to see that history of reqs if/when they can tell something is hinky in the spec? This isn't a question about organizing requirements. It is a question about WHO should have full VISIBILITY of requirements. I'd propose it should be ALL STAKEHOLDERS. Please point out where I'm wrong here.

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  • Digitizing notes?

    - by Nimmy Lebby
    I want to digitize my note taking. I was looking into using tablets or something of that sort but I feel that it would be too much of a challenge to type instead of actually writing my notes during meetings. That got me thinking into looking into something like LiveScribe. It looks neat but I don't know how it would work in the real world. How does OCR work with something like smart pens? How is the desktop applications? Any experience? Does anyone have an alternative suggestions? Positives and negatives? Any advice would be helpful.

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  • If an old Exchange server is not part of a domain, does that imply that it can be safely removed without affecting mailflow?

    - by Bigbio2002
    We are doing some cleanup, and there is an old Exchange VM hanging around that we want to get rid of. We do not have the local admin credentials, but we can ascertain that it is not part of the current domain. Seeing as the new production Exchange server is working fine, is it safe to power off and remove the old server? *I should probably note that this is not an Edge Transport server. There was an upgrade to Exchange 2013 at some point in the past, and there is only one functioning Exchange server now.

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  • Is there a pressure sensitive stylus for windows 8 power capacitative screen devices?

    - by JohnnyM
    I own a Dell XPS 12 Duo (filp-screen ultrabook with 10-point cap. screen) with Windows 8. Note: The ultrabook has Bluetooth 4.0. I would really love to have a preassure sensitive stylus that I could use to draw on the capacitative screen, when in tablet mode. So far I couldn't find any that would be compatible with Windows 8, maybe you guys could help. Must have: works with capacitative screen windows 8 compatible pressure sensitive Important: thin tip Nice to have: palm rejection tilt sensitive extra buttons (lots of them) TIA

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  • Redirecting 2 or more domains to same hosting server

    - by mtk
    I have domains A.com, A.co.in and A.in Purchased from site X. I have a hosting space/account purchased from site Y, which has provided me with 2 DNS entries that is to be replaced in the account at the site from where I purchase the domains. I have successfully changed the DNS entries of A.com to these 2 DNS entries and I am able to see my index.html page when I hit A.com. Problem On similar lines, I have changed the DNS entries to the same entries for A.co.in and A.in, but on hitting those sites in browser gives me no response and browser specific page of 'Site not found' is been seen. Please let me know, how to set this, so that when I hit any of the domain, the web-site is rendered from the hosting server? What am I doing wrong here? Note It has been more than 3 days after changing the DNS entries, so I don't think so this is a problem of DNS propagation, which I heard from some people. Please provide some detail explanation, as I am very very new to this. This is my first hosting ;) -Thanks

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  • Games without a(n explicit) game loop

    - by Davy8
    Most game development happens with a main game loop. Are there any good articles/blog posts/discussions about games without a game loop? I imagine they'd mostly be web games, but I'd be interested in hearing otherwise. (As a side note, I think it's really interesting that the concept is almost exclusively used in gaming as far as I'm aware, perhaps that may be another question.) Edit: I realize there's probably a redraw loop somewhere. I guess what I really mean is a loop that is hidden to you. Frames are something you as the developer are not concerned with as you're working on a higher level of abstraction. E.g. someLootItem.moveTo(inventory, someAnimatationType) and that will move from the loot box to your inventory using the specified animation type without the game developer having to worry about the implementation details of that animation. Maybe that's how "real" games end up working, but from reading most tutorials they seem to imply a much more granular level of control is used, but that might just be an artifact of being a tutorial.

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  • How do I setup Apache with FastCGI and Ruby?

    - by sdellysse
    I've been reading alot of forum posts, tutorials, etc., about setting up apache under linux with fastcgi. I'm trying to run fcgi for some of my ruby development (not rails), but I figure it should apply to any language. Please note that I already have apache, fastcgi, ruby-fcgi, and the like already installed on my web box. Conceptually, I'm having a hard time with it. Does apache spawn the specified fcgi processes as needed? Do I start them along side apache? Basically, I'm trying to get to a point where I am able to ask the proper questions, so apologies if the title is misleading.

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  • Why is an Ext4 disk check so much faster than NTFS?

    - by Brendan Long
    I had a situation today where I restarted my computer and it said I needed to check the disk for consistancy. About 10 minutes later (at "1%" complete), I gave up and decided to let it run when I go home. For comparison, my home computer uses Ext4 for all of the partitions, and the disk checks (which run around once week) only take a couple seconds. I remember reading that having fast disk checks was a priority, but I don't know how they could do that. So, how does Ext4 do disk checks so fast? Is there some huge breakthrough in doing this after NTFS came out (~10 years ago)? Note: The NTFS disk is ~300 GB and the Ext4 disk is ~500 GB. Both are about half full.

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  • Abbreviations override in comments and quoted text

    - by dotancohen
    I have the following handy abbreviation in VIM: iab for for<Space>(<Space>{{<Esc>kA<Left><Left><Left><Left><C-R>=Eatchar('\s')<CR> This nicely replaces for with the following text: for ( ) { } However, I would like this abbreviation to work only in code, not in comments or in single- or double- quoted strings. How might this constraint be accomplished? Note that I usually code in PHP, but often enough I find myself in other C-style languages (C, Java, occasional C#, etc.). Preventing the abbreviation from working in Python would be a nice bonus though I don't mind manually turning it off in Python if that is not an option. Thanks!

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  • Quick Fix for GlassFish/MySQL NoPasswordCredential Found

    - by MarkH
    Just the other day, I stood up a GlassFish 3.1.2 server in preparation for a new web app we've developed. Since we're using MySQL as the back-end database, I configured it for MySQL (driver) and created the requisite JDBC resource and supporting connection pool. Pinging the finished pool returned a success, and all was well. Until we fired up the app, that is -- in this case, after a weekend. Funny how things seem to break when you leave them alone for a couple of days. :-) Strangely, the error indicated "No PasswordCredential found". Time to re-check that pool. All the usual properties and values were there (URL, driverClass, serverName, databaseName, portNumber, user, password) and were populated correctly. Yes, the password field, too. And it had pinged successfully. So why the problem? A bit of searching online produced enough relevant material to offer promise. I didn't take notes as I was investigating the cause (note to self), but here were the general steps I took to resolve the issue: First, per some guidance I had found, I tried resetting the password value to nothing (using () for a value). Of course, this didn't fix anything; the database account requires a password. And when I tried to put the value back, GlassFish politely refused. Hmm. I'd seen that some folks created a new pool to replace the "broken" one, and while that did work for them, it seemed to simply side-step the issue. So I deleted the password property - which GlassFish allowed me to do - and restarted the domain. Once I was back in, I re-added the password property and its value, saved it, and pinged...success! But now to the app for the litmus test. The web app worked, and everything and everyone was now happy. Not bad for a Monday.  :-D Hope this helps, Mark

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  • Komodo Edit - How to disable the 'Linter' for a language?

    - by TM.
    I've been using Komodo Edit to work on a Django project. It works great except for one little annoyance: When I am editing Django template files, Komodo likes to put red squiggly lines underneath the first HTML tag that follows a Django tag, because it thinks it is an invalid HTML doc (although it isn't, it just has Django template tags/filters in it). Note that this red squiggly line is called a "Linter error" in the docs that I can find. Is there some way to turn off this red squiggly for only a specific type of language? It's nice to have when working on Python code but it's annoying to have a red squiggly on every single one of my Django templates.

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  • Why can't I install Ubuntu 10.04 on a system that already has Ubuntu 8.04?

    - by Android Eve
    Ubuntu 10.04 is beautiful. I love it. I am dying to install it on my PC, alongside the existing Ubuntu 8.04 (from which I write this message right now). But... it won't let me! When I reach the partitioning stage (manual!) Ubuntu 10.04 sees my two HDDs as one RAID volume. It doesn't see all the partitions I already have in place in /dev/sda and /dev/sdb. Even Windows 7 doesn't behave like this... (yes, I actually managed to install Windows 7 64-bit in dual-boot configuration with Ubuntu 8.04 on this same system). Note: GParted on Ubuntu 10.04 (live CD) sees the partition intended for Ubuntu 10.04 (/dev/sda4) perfectly, but is unable to format it. Any idea how to solve this problem?

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  • Recursive Unrar with Deletion as it progresses

    - by Jharwood
    Basically, i have a set of directories that are constantly being filled with .rar's, and i need to be able to extract them in place with automatic deletion of the left over .(rar|rXX) files. How would i go about this? Note: I can't delete all of them once done, they have to be deleted as the script completes one rar set. Example Directory Structure: / /folder1/ /file1.rar /file1.r00 /file1.r01 /folder2/ /sub.folder1/ /file2.part001.rar (contains a directory "file2") /file2.part002.rar /file2.part003.rar /sub.folder2/ /file3.rar /file3.r00 /file3.r01 Expected Result: / /folder1/ /file1.ext /folder2/ /sub.folder1/ /file2/ /file2.ext /sub.folder2/ /file3.ext

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  • some keys don't appear in xev

    - by sazary
    i can't change my screen brightness by pressing brightness keys on the keyboard, but they change through /sys/class/backlight/acpi_video0/brightness. so i started to diagnose the issue, ran xev and trying to see what happens when i press Fn+F5 or Fn+F6 which are brightness controls, and xev didn't show anything. i must note that it notifies my when i press volume controls, for example. are F5 and F6 keys working? yes, but not when i press them with Fn key. do i have any entry in xmodmap for brightness? yes: keycode 232 = XF86MonBrightnessDown NoSymbol XF86MonBrightnessDown keycode 233 = XF86MonBrightnessUp NoSymbol XF86MonBrightnessUp what's happening? and what should i do to correct it? i'm using vaio s series laptop with kubuntu precise on it. thanx ;)

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  • Exploring other windows 8 machine's root

    - by moswald
    (Note, this is without a domain.) I used to be able to type start \\other_machine\c$ in PowerShell and explorer would pop up with a login dialog. Then I'd type other_machine\moswald and my password (the account is a local admin, of course) and I'm in. Now both machines have Windows 8 installed, and this no longer works (the dialog re-prompts with an "Access is denied" displayed). I've verified (through whoami) that the user is named other_machine\moswald, and I'm positive I'm typing the correct password. So what gives? (edited to include specific result)

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  • VM: Windows 7 host, Linux guest, VT-d?

    - by chx
    I am sick of the driver issues of Linux. So I am planning to switch to Windows 7 as a host and virtualize my Linux into it. My laptop has integrated Intel graphics and supports VT-d. For speed reasons I would like to assign that card to Linux. Now, Parallels could do it but this page says Note: If you have only one PCIe video adapter, its name will be grayed out in the PCI Devices list and you will not be able to allocate it to your virtual machines. I would be perfectly fine with a headless Windows 7 (I can remotely admin from other computers or just the Linux guest) -- is there any VM software that doesn't have this restriction?

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  • VMware9 fails to launch Virtual OS. Ubuntu 12.10 64bit (Unable to change virtual machine power state: Pipe connection has been broken.)

    - by pst007x
    Another issue I need help with. I use VMware for work on Ubuntu 12.04. However for some reasons my VMware Workstation software generates the following error: Unable to change virtual machine power state: Failed to power on '/home/pst007x/vmware/Windows 7 x64/Windows 7 x64.vmx'. Transport (VMDB) error -14: Pipe connection has been broken. Product: VMware® Workstation Version: 9.0.0 build-812388 Host OS Version: 3.5.0-18-generic Ubuntu 12.10 64bit Kernel Linux 3.5.0-18-generic I have seen patches, but nothing works, and the patches are not maintained, broken links. PLEASE NOTE: I know that this has been asked, but there was no answer given that resolves this issue. Unfortunately I have changed all my office and personal PC's to Ubuntu, and use Win7 in a vm, however since 12.10, vm now fails to launch. For me this is a catastrophe, and makes Ubuntu useless for me to use! I am in a desperate situation here, is there is anyone that can offer any help I would be truly appreciative. I have looked on the VMware forums and the only solution is offered for Fedora, but the people posting there are not clear about what the solution is! thanks PLEASE DO NOT CLOSE THIS QUESTION! I have tried everywhere to find a solution, but I have come up blank... Patches referenced to in other posts do not work in this version of VMware...

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  • USB HD Freezes Windows Explorer

    - by nfplee
    I recently purchased a "Seagate STBX1000200 1TB Expansion 2.5 inch External Hard Drive". It has been working without problems until recently. When i plug the device into a USB port the device is recognised as it appears in the device manager but when i go to Windows Explorer and try to open it (or right click on it) it hangs/freezes windows explorer. Please note i am using Windows 7 Professional. I have already tried various things without success after searching for people with similar problems. I did read that it could be a problem with how the computer assigns a drive letter. But whrn i go to disk management (when running as an administrator) it hangs and displays the following message: Connecting to virtual disk service I'd appreciate it if anyone could offer some advice. Thanks

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  • C++ function templates, function name confusion. This is funny [migrated]

    - by nashmaniac
    Alright so heres the program and works absolutely right #include <iostream> using namespace std; template <typename T> void Swap(T &a , T &b); int main(){ int i = 10; int j = 20; cout<<"i, j = " << i <<" , " <<j<<endl; Swap(i,j); cout<<"i, j = " << i <<" , " <<j<<endl; } template <typename T> void Swap(T &a , T &b){ T temp; temp = a ; a = b; b= temp; } but when I change the function's name from Swap to swap it generates an error saying error: call of overloaded 'swap(int&, int&)' is ambiguous| note: candidates are: void swap(T&, T&) [with T = int]| ||=== Build finished: 1 errors, 0 warnings ===| what happened is it a rule to start functions using templates to start with a capital letter ?

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  • unexpected behaviour of Ctrl-a x and Ctrl-a X in screen?! regions, locking

    - by gojira
    According to the screen manual (version 4.0.2.) C-a x C-a C-x (lockscreen) Lock this terminal. C-a X (remove) Kill the current region. But what actually happens when I use it (Screen version 4.00.03 (FAU) 23-Oct-06): C-a X locks the terminal and asks me for the password. When I enter the correct passwword, I am back in screen but the region is killed (wtf) C-a x does nothing apparently Please note the differences between x (lowercase) and X (uppercase). Why is there a mixup between the functionalities of C-a X and C-a x? How can I fix this? I am on CentOS release 5 (Final).

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  • I want to make an item on a Windows 7 Jump List run as administrator

    - by ProfKaos
    Only occasionally I have to open a Visual Studio project with a VS instance running under admin. This is a little inconvenient because I can't use the short-cut for that project in the VS Jump List. How can I modify the Jump List entry to force VS to open that project running as admin? Please note that I'm not trying to avoid providing admin auth to do this. I'm just trying to avoid having to run VS as admin, and then having to open the project from within VS once it opens.

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  • Unable to make sound play in headset

    - by user50849
    Top right, I click the sound icon, select sound settings, and connect my USB-headset. I can them see the headset being detected as it pops up in the menu. I click it, and expect the currently played audio to get sent to the headset instead. My problem is that it does not. The audio keeps playing through the built-in speakers. More info: The icon for my built-in card in the sound settings is a circuit with a note symbol on top. The symbol for the headset is just black background with a "No" symbol on it. Might mean it doesn't work somehow. I installed pavucontrol, and notice that no second sound card shows up in there. When connecting, the syslog says Jun 20 09:38:46 yuna kernel: [40144.553431] usb 2-1.2: new full-speed USB device number 11 using ehci_hcd Jun 20 09:38:46 yuna kernel: [40144.650609] input: C-Media USB Headphone Set as /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.2/2-1.2:1.3/input/input20 Jun 20 09:38:46 yuna kernel: [40144.650895] generic-usb 0003:0D8C:000C.000B: input,hidraw0: USB HID v1.00 Device [C-Media USB Headphone Set ] on usb-0000:00:1d.0-1.2/input3 Jun 20 09:38:46 yuna mtp-probe: checking bus 2, device 11: "/sys/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.2" Jun 20 09:38:46 yuna mtp-probe: bus: 2, device: 11 was not an MTP device

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