file structure - Page 750

Animate sprite/texture position with VBO

- by Dono

I'm currently worlking on a renderer for my projects and I want animate a sprite on screen. I've got a spritesheet but I don't know what is the the best way to update the texture coordinates for each vertex. Update vertices then update vertex buffer. (Heavy ?) Send to the shader my texture coordinates (It is possible ?) Don't use VBO ? By the way, I've got this structure : Object class with Geometry (Faces + Vertex + Buffer) and Material (Shader + other stuff ) properties, it is a good structure ? Thanks!

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Reusing elements in StandardStyles.xaml

- by nmarun

In one of my previous blogs (second point) , I mentioned not to modify the StandardStyles.xaml, but instead to create your own resource dictionary. I also mentioned how to declare your custom styles dictionary in the App.xaml file. If you want to reference or build upon from an existing style in the StandardStyles.xaml file, do the following: 1. Remove the entry for StandardStyles.xaml in the App.xaml file 2. Add your custom resource dictionary in the App.xaml file 1:  2: <...(read more)

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ffmpeg options: -acodec libfaac -ab 192k produce 150kbit files?

- by piedro

Hello! When I use ffmpeg to convert an audiofile with the option -acodec libfaac -ab 192k and use ffmpeg -i on that file afterwards to get the audio file information, it tells me bitrate: 152 kb/s Why ist this? Do I miss something here? If I want to convert a file with a bitrate of 192kb it should give me 192 kbit after the conversion, shouldn't it? Or: How do I get the 192 kbit rate then?

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Fresh install of nginx causes browser to download index.html instead of opening it

- by 010110110101

When I view this in Chrome, http://localhost:90 the file is downloaded instead of displayed in Chrome. This question has been asked a lot of times on SO, but about index.php files. My problem is a plain jane HTML file, not a PHP file. That hasn't been asked yet. I was hoping the solution would be similar, but I haven't been able to figure it out. Here's my example.com.conf: server { server_name localhost; listen 90; root /var/www/example.com/html index index.html location / { try_file $uri $uri/ =404; } } My index.html file contains only two words, no markup Hello World I think it's the mime.types. The mime.types file has the entry for html in it. This is a fresh nginx install. nginx -t reports "test is successful"

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How to merge several detached signatures from different people into one?

- by Petr Pudlák

A group of people wants to publish a file and they all want to digitally sign the file as different recipients of the file will have different chains of trust. For simplicity, it's desired that there is only one detached signature file with all the signatures, so that the recipients don't need to check them one by one: foo.tar.gz foo.tar.gz.sig However, for security reasons, every person needs to perform the signing on their computer, it's not possible to create the combined signature by having multiple private keys on one computer and performing the operation with one command. Is it possible with GPG to somehow merge detached signatures of a file from multiple participants?

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while(true) and loop-breaking - anti-pattern?

- by KeithS

Consider the following code: public void doSomething(int input) { while(true) { TransformInSomeWay(input); if(ProcessingComplete(input)) break; DoSomethingElseTo(input); } } Assume that this process involves a finite but input-dependent number of steps; the loop is designed to terminate on its own as a result of the algorithm, and is not designed to run indefinitely (until cancelled by an outside event). Because the test to see if the loop should end is in the middle of a logical set of steps, the while loop itself currently doesn't check anything meaningful; the check is instead performed at the "proper" place within the conceptual algorithm. I was told that this is bad code, because it is more bug-prone due to the ending condition not being checked by the loop structure. It's more difficult to figure out how you'd exit the loop, and could invite bugs as the breaking condition might be bypassed or omitted accidentally given future changes. Now, the code could be structured as follows: public void doSomething(int input) { TransformInSomeWay(input); while(!ProcessingComplete(input)) { DoSomethingElseTo(input); TransformInSomeWay(input); } } However, this duplicates a call to a method in code, violating DRY; if TransformInSomeWay were later replaced with some other method, both calls would have to be found and changed (and the fact that there are two may be less obvious in a more complex piece of code). You could also write it like: public void doSomething(int input) { var complete = false; while(!complete) { TransformInSomeWay(input); complete = ProcessingComplete(input); if(!complete) { DoSomethingElseTo(input); } } } ... but you now have a variable whose only purpose is to shift the condition-checking to the loop structure, and also has to be checked multiple times to provide the same behavior as the original logic. For my part, I say that given the algorithm this code implements in the real world, the original code is the most readable. If you were going through it yourself, this is the way you'd think about it, and so it would be intuitive to people familiar with the algorithm. So, which is "better"? is it better to give the responsibility of condition checking to the while loop by structuring the logic around the loop? Or is it better to structure the logic in a "natural" way as indicated by requirements or a conceptual description of the algorithm, even though that may mean bypassing the loop's built-in capabilities?

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Autosaving on emacs or xemacs files (preferably on loss of focus)

- by Spencer

Ideally I want to replicate with emacs functionality from TextMate, whereby on loss of focus i.e. I click away from the buffer, my file saves. If this isn't possible, I want to customize emacs so that it will autosave the file for every character I write. When I say this I don't mean I want to autosave to the ~ backup files. I want to save the file I am currently working on. I am working on a Fedora VM. Note I am not looking for a backup or autosave. I want the file I am actually in to save, so that if I loaded the html file I am editing in a web browser it would reflect my new changes without me having to explicitly change it.

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Is there a way I can choose what individual files to download within a .torrent?

- by Valamas

Is there a way to get the list of files under the files tab without the download starting? Sometimes I am after a single file within a torrent, however, to see the list, I need to start downloading. I then select the only file I want to download, but the other files which started to download and were stopped still will appear on the completed side even if 1k/600k of that file has downloaded. You can imagine the mess and confusion this can cause. So, is there a way I can instruct my BitTorrent/uTorrent program to just grab the file list? Solution: You must download the .torrent file. This contains the list of files. If you download using a magnet link, you do not get the list of files until the torrent starts.

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Watch syntax help

- by Jason

In my Systems Programming class, there are weekly programming experiments, and I'm having trouble with the current one. The objective is to write a C program that slowly writes a string of text to a file, metered by usleep() in a 100 count for loop. The goal of the experiment is to observe the file size buffer in action via the watch command. However, I can't get it to work using watch -d ./output What syntax do I need for the watch command to see the changes made to the file size?

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Overview of XSLT

- by kaleidoscope

XSLT (Extensible Stylesheet Language Transformations) is a declarative- XMLbased language used for the transformation of XML documents into other XML documents. Using XSLT , the original document does not changed; rather, a new document is created based on the content of an existing one. XSLT is developed by the World Wide Web Consortium (W3C). Using XSLT we can transform source xml file into another xml file, word file or Excel file. XSLT Functions : - There are the following built - in XSLT functions : Name Description current() Returns the current node document() Used to access the nodes in an external XML document element-available() Tests whether the element specified is supported by the XSLT processor format-number() Converts a number into a string function-available() Tests whether the function specified is supported by the XSLT processor generate-id() Returns a string value that uniquely identifies a specified node key() Returns a node-set using the index specified by an <xsl:key> element system-property() Returns the value of the system properties unparsed-entity-uri() Returns the URI of an unparsed entity For more information – http://www.w3schools.com/xsl/default.asp Technorati Tags: Ritesh, Overview of XSLT

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Missing error handling in Streaming-AJAX-Proxy Log

- by Michael Freidgeim

We are using AjaxProxy(FROM http://www.codeproject.com/KB/ajax/ajaxproxy.aspx) on our web site, but started to notice errors accessing log.txt file. I found that the file is created by Log class and doesn't have ability to switch it off and error handling. I've added reading file name from configuration and try/catch block public static class Log { private static StreamWriter logStream; private static object lockObject = new object (); public static void WriteLine(string msg) { string logFileName = ConfigurationExtensions.GetAppSetting("AjaxStreamingProxy.LogFile" ,""); if (logFileName.IsNullOrEmpty()) return; try { if (logStream == null ) { lock (lockObject) { if (logStream == null ) { logStream = File.AppendText(Path .Combine(AppDomain.CurrentDomain.BaseDirectory, logFileName)); } } } logStream.WriteLine(msg); } catch (Exception exc) { string ignoredMsg = String .Format("The error occured while logging {0}, but processing will continue.\n {1} ", exc); LoggerHelper.LogEvent(ignoredMsg, MyCategorySource, TraceEventType .Warning, true); } }

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Dom U Installation on Ubuntu 11.10

- by sridutt

I am trying to add a DomU Operating system on Ubuntu 11.10. I have successfully installed Xen. Verified with xm info virsh-version which returns: Compiled against library: libvir 0.9.2 Using library: libvir 0.9.2 Using API: Xen 3.0.1 Running hypervisor: Xen 4.1. Now when I tried to install Dom0 it said: unable to connect to 'localhost:8000': , in VMM. So, I followed this bug link. I could now start adding DomU. When adding DomU, in last stage, it gives the following error: Unable to complete install: 'POST operation failed: xend_post: error from xen daemon: (xend.err "Error creating domain: device model '/usr/lib/xen/bin/qemu-dm' not found")' Traceback (most recent call last): File "/usr/share/virt-manager/virtManager/asyncjob.py", line 44, in cb_wrapper callback(asyncjob, *args, **kwargs) File "/usr/share/virt-manager/virtManager/create.py", line 1899, in do_install guest.start_install(False, meter=meter) File "/usr/lib/pymodules/python2.7/virtinst/Guest.py", line 1223, in start_install noboot) File "/usr/lib/pymodules/python2.7/virtinst/Guest.py", line 1291, in _create_guest dom = self.conn.createLinux(start_xml or final_xml, 0) File "/usr/lib/python2.7/dist-packages/libvirt.py", line 1686, in createLinux if ret is None:raise libvirtError('virDomainCreateLinux() failed', conn=self) libvirtError: POST operation failed: xend_post: error from xen daemon: (xend.err "Error creating domain: device model '/usr/lib/xen/bin/qemu-dm' not found") I tried following this bug link that said, the bug is solved in the below package. When I run ./configure in this, I am getting an error: checking for LIBXML... no checking libxml2 xml2-config >= 2.6.0 ... configure: error: Could not find libxml2 anywhere (see config.log for details). What is the problem?

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Conflicts with MS Office temporary files when using Offline Folders on Vista

- by Tambet

We are using Offline Folders feature of Windows Vista to make files on network shares available when out of office. Mostly it is working, but every time I do a sync I get a lot of such errors: D500E7B8.tmp - A file was deleted on this computer and changed on the server while this computer was offline. There are hundreds of them. I always select all of them and choose resolution "Delete from both locations". But what is causing this and how can I avoid it? I suspect the reason is that we are using Debian and Samba (3.4.7) on our file server. I've been looking for some Samba options that would cure this, but with no success. I learned that probably the cause is, that both Word and Excel are using specific pattern to change files - they never change the original file, but instead always write a new temporary file and rename it to original file, when you click Save. This is documented here: http://support.microsoft.com/kb/211632/?FR=1.

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Invoking JavaScript from Java

- by Geertjan

Here's an Action class defined in Java. The Action class executes a script via the JavaFX WebEngine: @NbBundle.Messages("CTL_AddBananasAction=Add Banana") private class AddBananasAction extends AbstractAction { public AddBananasAction() { super(Bundle.CTL_AddBananasAction()); } @Override public void actionPerformed(ActionEvent e) { Platform.runLater(new Runnable() { @Override public void run() { webengine.executeScript("addBanana(' " + newBanana + " ') "); } }); } }How does the 'executescript' call know where to find the JavaScript file? Well, earlier in the code, the WebEngine loaded an HTML file, where the JavaScript file was registered: WebView view = new WebView(); view.setMinSize(widthDouble, heightDouble); view.setPrefSize(widthDouble, heightDouble); webengine = view.getEngine(); URL url = getClass().getResource("home.html"); webengine.load(url.toExternalForm()); Finally, here's a skeleton 'addBanana' method, which is invoked via the Action class shown above: function addBanana(user){ statustext.text(user); } By the way, if you have your JavaScript and CSS embedded within your HTML file, the code navigator combines all three into the same window, which is kind of cool:

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Are HTTP requests cached? [closed]

- by nischayn22

Many HTTP requests are sent repeatedly by browsers on almost every page load, such as requesting the jQuery .js file etc. Since these are already used on too many sites doesn't modern browsers keep a cache for this? I am thinking of a system where the browser has a cached copy of the .js file used very very frequently. On a new request for the .js file, it sends the server a request for a hash of the .js file (provided the server can reply to that) and compares the returned hash with the cached copy's hash... rest is intuitive.

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How do I do a B43 Legacy install on Ubuntu 11.10?

- by Gozzy

I recently installed ubuntu onto an extra hard drive and everything booted correctly. However, my Linksys wireless card is not working. I went though all the forums and walk throughs and I know that I need to install the b43 legacy firmware to get the card to work. When I try to install the files, I keep getting the message in Terminal saying "No such file or directory" for every file i need to run. It's Ubuntu 11.10 on a dell optiplex gx280. Also, the "pool" file that is supposed to be on the file system is not there

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Request of some opinions about a vertical menu style and some suggestions for the site style [on hold]

- by AndreaNobili

I am developing a simple mainly static website using WordPress (because maybe in the future I will add some dynamic content) for a company. The new site have to follow the structure of the old site that requires the presence of a vertical main menu in the left column that contains the link to all the statics pages in the site. This is the old site structure: http://www.saranistri.com/ Now I have installed a new WordPress test site (this is only a test site): http://onofri.org/example/ As you can see in the left columns I have put two main menu vetical widgets that implements a possible choise for the maun menù (the top menù upon the header must be eliminated in the final implementation) I want to know some opinions about: 1) Which of the two version is better? Do you have some additional ideas about the CSS style of this vertical menu? 2) What could I do to give a more professional look to this site? (I know that I have to insert a logo into the header) Tnx Andrea

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Replace Certificate using Plesk 11

- by Lambda Dusk

I am not an admin, but a programmer. But how it is, if you're the only guy who knows about computers, everyone shoves those tasks to you. A certificate of a domain recently expired. The domains are managed using Plesk 11, on a Linux system, Apache2.2. I was given a new certificate from the host, and it is one single .pem file. However, Plesk asks me for a .crt file, a private key and some CA file. I have neither, only this single .pem file the host claims to be the certificate. Since I myself never did anything with SSL certificates, I would really appreciate if anyone can tell me what to do with this file and how to properly add a new one so the old one can be removed.

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Need instructions on how to create wpa_supplicant.conf and add fast_reauth=0 to it

- by nutty about natty

Like many other natty users on a university/academic network, I'm experiencing annoying frequent disconnects/hangs/delays. See, for instance here. I would like to learn how to add fast_reauth=0 to the wpa_supplicant.conf file. This file, it seems, does not exit by default, and needs to be manually created first: README You will need to make a configuration file, e.g. /etc/wpa_supplicant.conf, with network configuration for the networks you are going to use. Further, I installed wpa_gui which probably needs to be launched with parameters, else it's pretty blank... What I'm hoping for is this: That creating a wpa_supplicant.conf file with fast_reauth=0 in it, saving it to the relevant path, will work and make my uni wireless (more or even completely) stable. I read mixed reviews about wicd (as an alternative to the network manager). Also note that on my basic wlan at home (with bog-standard wpa encryption) the connection is stable. Thanks!

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How to enable logging for Google Chrome in Ubuntu 12.04?

- by skytreader

I'm trying to capture the logs for a certain bug I'm having with Google Chrome. However, I can't find/enable logs for GC. According to this Chromium project page, I just need to add the flags --enable-logging --v=1 and a chrome_debug.log file will appear in my user data directory. However, after running GC (and closing through the 'X' title bar button) there is no chrome_debug.log file in the specified directory. I even tried running as root as it may have something to do with write permissions but GC refuses to start as root. Another thing, GC also prints messages when invoked from command line. I tried capturing this and redirecting them to a file via $ google-chrome > today.log but the messages are still printed in the command line and the file I specify gets created but remains empty. Note that I can't just copy-paste the messages printed on terminal after my bug occurs as the bug freezes up my whole system that, when it occurs, my only option is to turn off my computer straight via the power button. I've seen a few similar bugs already posted but I find that they don't exactly describe my situation so I'd really like to get some logs for this. So how do I enable logging or, at least, get those terminal messages in a file?

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Browser Item Caching and URLs

- by Damon

Ultimately you want the browser to cache things like Flash components, Silverlight XAP files, and images to avoid users having to download them each time they hit a page. But during development it's very useful to NOT have things cached so you are always looking at the most up-to-date file. You can always turn off caching on your browser, but if you use your browser for daily browsing then its not the greatest option. To avoid caching we would always just slap a randomly generated GUID to the back of the URL of any items we didn't want to cache (e.g. http://someserver.com/images/image.png?15f073f5-45fc-47b2-993b-fbaa781b926d). It worked well, but you had to remember to remove the random GUID when it went to production. However, on a GimmalSoft project we recently implemented someone showed me a better way that didn't need to be removed from production code - just slap the last modified date of the file on the end of the URL (or something generated from the modification date). This was kind of genius approach because it gives you the best of both world. If you modify the file, the browser goes out and gets the newest version. If you don't modify the file, it has the cached copy. Very helpful! The only down side is that you do have to read the modification date from the file, which does technically take some time.

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Browser Item Caching and URLs

- by Damon Armstrong

Ultimately you want the browser to cache things like Flash components, Silverlight XAP files, and images to avoid users having to download them each time they hit a page. But during development it’s very useful to NOT have things cached so you are always looking at the most up-to-date file. You can always turn off caching on your browser, but if you use your browser for daily browsing then its not the greatest option. To avoid caching we would always just slap a randomly generated GUID to the back of the URL of any items we didn’t want to cache (e.g. http://someserver.com/images/image.png?15f073f5-45fc-47b2-993b-fbaa781b926d). It worked well, but you had to remember to remove the random GUID when it went to production. However, on a GimmalSoft project we recently implemented someone showed me a better way that didn’t need to be removed from production code – just slap the last modified date of the file on the end of the URL (or something generated from the modification date). This was kind of genius approach because it gives you the best of both world. If you modify the file, the browser goes out and gets the newest version. If you don’t modify the file, it has the cached copy. Very helpful! The only down side is that you do have to read the modification date from the file, which does technically take some time.

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Disable "Ubuntu 14.04" and "Files" from auto sorting alphabetically and THEN<(Disable the then.) automatically going to that location

- by Doodski Man

I looked about in Ubuntu 14.04 and I could not find a option to disable a feature that made extra work for me. After renaming something "Files" then reorganizes alphanumerically and then automatically moves the prompt/cursor/highlighting to the new file name at the new alphanumerical location. It's much easier and practical if the working cursor remains in the same area where the file was found that needed name changes or needed name spelling corrections. Windows 7 does what I ask about and it's a huge improvement over that auto sort and then go to the new file location. A example to consider is a file is in the "A" area and then you rename it to a "Z" and you are then taken to the "Z" stuff and need to scroll hundreds of lines back to the "A" section. It's annoying. Thanks for reading and taking the time.

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rsync assigns deny permission

- by user773478

Currently a script is used to copy files using rsync (version 2.6.9 protocol version 29) from Linux/Unix servers to W2K3 server using very basic command such as "rsync -v source_server::share_name/file_name /cygdrive///file_name" The script further makes copy of this downloaded file for other purposes. This is part of a larger middleware that is being moved to new hardware on W2K8R2 Second part of making copy of the file does not work using more recent rsync client version 3.0.7 protocol version 30 (shows up as cwRsync in add/remove programs) Reason being rsync assigns special permissions to file that includes deny. The user (service account) which downloads the file is in local admin group. The file can be copied elsewhere using rsync. It can be deleted. But cannot be opened or copied locally by same user as deny permission supersedes.

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NFS mount of /var/www to OS X

- by ploughguy

I have spent 2 hours trying to create an NFS mount from my Ubuntu 10.04 LTS server to my OS X desktop system. Objective: three way file compare between the code base on the Mac, the development system on the local Linux test system, and the hosted website. The hosted service uses cpanel so I can mount a webdisk - easy as pie - took 10 seconds. The local Ubuntu box, on the other hand - nothing but pain and frustration. Here is what I have tried: In File Browser, navigate to /var/www/site and right-click. Select share this folder. Enter sharename wwwsite and a comment. Click button "Create Share". Message says - you can only share file systems you own. There is a message on how to fix this, but the killer is that this is sharing by SMB. It will change the LFs to CR-LFs which will affect the file comparison. So forget this option. In a terminal window, run shares-admin (I have not been able to convince it to give me the "Shared Folders" option in the System Administration window - Maybe it is somewhere else in the menu, but I cannot find it) define an NFS export. Enter the path /var/www/site, select NFS enter the ip address of the iMac and save. On the mac, try to mount the file system using the usual methods - finder, command line "mount" command - not found. Nothing. Tried restarting the linux box in case there is a daemon that needs restarting - nothing. So I have run out of stuff to do. I have tried searching the documentation - it is pretty basic. The man page documentation is as opaque as ever. Please, oh please, will someone help me to get this @38&@^# thing to work! Thanks for reading this far... PG.

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