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  • What should be learned for someone starting in Android Games?

    - by user14544
    I know this might be a little subjective. But I've read the other questions. A lot of answers kept on popping up like to use box2d, libgdx, andEngine, etc. So the real question is, what would be the best to start off with as a beginner. I have some experience with java code, just by reading about in the Oracle Docs. I've gone through Flash and Eclipse. When i mean gone through, i don't mean i have actually created my own game from Flash or Eclipse, but i just learn things here and there. Currently I'm reading Beginning Android for Beginners but I don't have the knowledge to implement my own Ideas into the game tutorials because of lack of experience. I'm looking for a way to learn how to program to create games for Android. While at the same time get experience from programming. I do not want to learn those drag and drop game making applications such as GameMaker.

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  • Unknown file system: grub Rescue

    - by samba
    I deleted the partition which contains the Ubuntu 12.0.4 OS. I have windows one other drive. When I reboot the system, It shows the following. unknown filesystem. grub rescue I read the previous questions about this topic and I tried to install Linux again using usb flash drive but was unable to boot from flash drive. I do not have a DVD ROM... what Shall I do now to boot from windows...? thank you in advance....

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  • Unable to Install ubuntu onto a blank hard drive

    - by user287561
    I just built a pc and I am trying to install Ubuntu 14 onto it. I did the process in which you format the flash drive to be able to have Ubuntu 14 and install directly in BIOS. BIOS is set up to boot from the flash drive. Every time I try to do the install process, it will randomly reboot itself onto the motherboard BIOS menu. This loop constantly occurs and the only way I can use Ubuntu is to put the option of trying but not installing. HELP!

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  • Is there any remote desktop with sound and video capabilities allowing 2 different users work simultaniousely (a local and a remote one)?

    - by psihodelia
    I have a very powerful PC with Intel processor and a small Mac laptop with PowerPC processor. Both computers are with Ubuntu Linux. Mac laptop cannot play flash videos and I cannot install any Intel-CPU program on it (like Skype). So, it means I can install only open source applications on the laptop from Ubuntu repositories. I have two different Ubuntu system users on PC, say ME and SHE (and root as well :) ). If I work as user ME on PC, then user SHE should also be able to access my PC remotely from her laptop and she should see a desktop of user SHE, not my desktop. She also must be able watch videos, flash, and listen sounds. Is it possible with Ubuntu?

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  • Unity GUI not in build, but works fine in editor

    - by Darren
    I have: GUITexture attached to an object A script that has GUIStyles created for the Textfield and Buttons that are created in OnGUI(). This script is attached to the same object in number 1 3 GUIText objects each separate from the above. A script that enables the GUITexture and the script in number 1 and 2 respectively This is how it is supposed to work: When I cross the finish line, number 4 script enables number 1 GUITexture component and number 2 script component. The script component uses one of number 3's GUIText objects to show you your best lap time, and also makes a GUI.Textfield for name entry and 2 GUI.Buttons for "Submit" and "Skip". If you hit "Submit" the script will submit the time. No matter which button you press, The remaining 2 GUIText objects from number 3 will show you the top 10 best times. For some reason, when I run it in editor, everything works 100%, but when I'm in different kinds of builds, the results vary. When I am in a webplayer, The GUITexture and the textfield and buttons appear, but the textfield and buttons are plain and have no evidence of GUIStyles. When I click one of the buttons, the score gets submitted but I do not get the fastest times showing. When I am in a standalone build, the GUITexture shows up, but nothing else does. If I remove the GUIStyle parameter of the GUI.Textfield and GUI.Button, they show up. Why am I getting these variations and how can I fix it? Code below: void Start () { Names.text = ""; Times.text = ""; YourBestTime.text = "Your Best Lap: " + bestTime + "\nEnter your name:"; //StartCoroutine(GetTimes("Test")); } void Update() { if (!ShowButtons && !GettingTimes) { StartCoroutine(GetTimes()); GettingTimes = true; } } IEnumerator GetTimes () { Debug.Log("Getting times"); YourBestTime.text = "Loading Best Lap Times"; WWW times_get = new WWW(GetTimesUrl); yield return times_get; WWW names_get = new WWW(GetNamesUrl); yield return names_get; if(times_get.error != null || names_get.error != null) { print("There was an error retrieiving the data: " + names_get.error + times_get.error); } else { Times.text = times_get.text; Names.text = names_get.text; YourBestTime.text = "Your Best Lap: " + bestTime; } } IEnumerator PostLapTime (string Name, string LapTime) { string hash= MD5.Md5Sum(Name + LapTime + secretKey); string bestTime_url = SubmitTimeUrl + "&Name=" + WWW.EscapeURL(Name) + "&LapTime=" + LapTime + "&hash=" + hash; Debug.Log (bestTime_url); // Post the URL to the site and create a download object to get the result. WWW hs_post = new WWW(bestTime_url); //label = "Submitting..."; yield return hs_post; // Wait until the download is done if (hs_post.error != null) { print("There was an error posting the lap time: " + hs_post.error); //label = "Error: " + hs_post.error; //show = false; } else { Debug.Log("Posted: " + hs_post.text); ShowButtons = false; PostingTime = false; } } void OnGUI() { if (ShowButtons) { //makes text box nameString = GUI.TextField( new Rect((Screen.width/2)-111, (Screen.height/2)-130, 222, 25), nameString, 20, TextboxStyle); if (GUI.Button( new Rect( (Screen.width/2-74.0f), (Screen.height/2)- 90, 64, 32), "Submit", ButtonStyle)) { //SUBMIT TIME if (nameString == "") { nameString = "Player"; } if (!PostingTime) { StartCoroutine(PostLapTime(nameString, bestTime)); PostingTime = true; } } else if (GUI.Button( new Rect( (Screen.width/2+10.0f), (Screen.height/2)- 90, 64, 32), "Skip", ButtonStyle)) { ShowButtons = false; } } } }

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  • USB Hardware vs. Software Write Lock

    - by TreyK
    I'm in the market for a USB flash drive, and remember this cool feature a tiny 32MB flash drive of mine had: a write lock switch. This seemed like it would be an amazing feature to have as a shield against any nastiness happening to the drive on an unfamiliar computer. However, very few drives on the market offer this feature. Instead, it seems that forms of software protection are the more prominent method. This software protection causes me a bit of uneasiness, as it seems like this software wouldn't be nearly as bulletproof as a physical switch. Also, levels of protection seem to vary from product to product. Being able to protect certain folders from reading and/or writing would be nice, but is the security trade-off worth it? Just how effective can this software protection be? Wouldn't a simple format be able to clean any drive with software protection? My drive must also be compatible with Windows XP, Vista, and 7, as well as Linux and Mac. What would be the best way forward for getting a well-sized (~8GB) flash drive with a strong write protection implementation, for little or no more than a regular drive? Thanks.

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  • Issues with creating USB bootable Mountain Lion

    - by Sidd
    I am trying to set up a triple boot Windows 8, Mountain Lion, and Ubuntu. I am stuck though. I have got Windows 8 on a partition, and I am trying to get Mountain Lion on there at this point. I installed a VMware with a Snow Leopard 10.6.2 image on the Windows 8 platform. I used the disk utility in this program in order to get Mountain Lion on there. This is what i did specifically: I got the installesd.dmg. I 'mounted' that file or whatever you call it, and out came something along the lines of "Install Mountain Lion OS x" (something like that - it was like a submenu under the installesd.dmg in the disk utility). I got my PNY 8 gb Attache Flash Drive and went to the Erase tab of disk utility. I erased it using the Mac OS Extended (Journaled) setting and called it "Mac". I went to the Restore tab, dragged "Mac" into destination, and dragged "Install Mountain Lion OS x" to the source. Everything seemed to go well, but it didn't. When trying to boot from the flash drive (and yes, I set the BIOS correctly), it skipped it, and loaded Windows 8 normally as if nothing was plugged in. When I try looking at the flash drive in windows 8, it comes up as a 200 mb capacity drive labeled "EFI" with nothing in it (remember, it was 8gb in the beginning). I downloaded Plop Boot Manager, but it did not recognize a USB being plugged in. Does anyone know how I could fix this?

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  • Linux Mounting Problem

    - by Sam
    I have an Iomega Network Attached Storage device on my Windows network. I am trying to use a clonezilla live USB flash drive to backup my netbook to my Iomega Network Attached Storage device. The clonezilla USB flash drive runs linux. I'm having trouble getting the Network Attached Storage unit to mount using the following command: mount -t cifs -o username="myUsername" //192.168.1.100/backup /home/partimg The response from linux is: [134.730738] CIFS VFS: cifs_mount failed w/return code = -6 retrying with upper case share name [134.788461] CIFS VFS: cifs_mount failed w/return code = -6 mount error(6): No such device or address Refer to the mount.cifs(8) manual page (e.g. man mount.cifs) I also tried adding the following to my username: username="myUsername,domain=workgroup" but that did not change the error. I am able to ping the network attached storage unit from linux on my netbook. I also booted from a Slax Live USB Flash Drive and Slax auto-mounted my network attached storage unit via Samba. Unfortunately, I don't believe that I can run clonezilla from inside the Slax installation. Does anyone have any insight about what is wrong with my mount statement? Or is there something peculiar about Iomega drives which makes this impossible?

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  • How Do I Install Latest Java Plugin on Ubuntu 8.04 LTS with Custom Firefox 3.6.3?

    - by Volomike
    I have Ubuntu 8.04 LTS and will need to remain on that for awhile as I am a programmer and cannot disturb what I'm doing in the middle of a project. As you know, it doesn't want to install the latest Firefox by default and keeps me in the stone age. So, I had to install my own Firefox. I did so and with relative ease I was able to install the Flash plugin using the normal 'ln -s' technique one usually does with /usr/lib/firefox/plugins. Now I need to do a Gotomypc.com task and it requires Java -- moan -- so I need to figure out how to install Java. I downloaded and installed the latest Java plugin in /usr/java, and I do see underneath that layer of folders a plugins folder with a .so file. So, I went to /usr/lib/firefox/plugins and did this: ln -s /usr/java/jre1.6.0_20/plugin/i386/ns7/libjavaplugin_oji.so Then, I also read on the web that one has to create a ~/.mozilla/plugins folder, cd into it, and then run the same ln -s command again. Another site recommended finding one's ~/.mozilla/firefox and renaming it to ~/.mozilla/firefox.old (after you backed up your bookmarks) and then launching firefox again so that it creates ~/.mozilla/firefox and uses the new Java plugin. Well, all these attempts have completely failed and it is incredibly frustrating. I do about:plugins to see my plugins and all I get are the Flash and the default null plugin. I do not see the Java one. Also, they said on my tools menu with Firefox 3.6.3 I would see a Java Console menu and I don't see that either. I found a pluginreg.dat somewhere deep under ~/.mozilla/firefox, but it does not list the Java plugin inside -- only Flash and the null plugin. Please help me install Java. I need to help a client out and need to connect to his PC remotely with gotomypc, which requires Java inside firefox.

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  • Clarification for setting up SSH terminal access on Cisco IOS

    - by Matt Malesky
    I'm attempting to set up SSH on a Cisco 2811 and having some difficulties. The first step to this should be running crypto key generate rsa I seem to be missing this though: better#crypto key generate rsa ^ % Invalid input detected at '^' marker. better# Furthermore, the only available commands I have in the crypto key namespace are lock and unlock, which seem to indicate a locked keypair (for which I don't know the password): better#crypto key ? lock Lock a keypair. unlock Unlock a keypair. better#crypto key unlock ? rsa RSA keys better#crypto key unlock rsa %% Please enter the passphrase: %% Unlocking failed. . better# More or less, I'm asking what exactly this might mean, and if I actually do have certificates already here (used router)? Otherwise, how can I solve this? It's my first time configuring this feature, but I definitely believe it's part of my IOS. Speaking of my IOS, I'm running the image c2800nm-advsecurityk9-mz.124-24.T6.bin I'll also note that I have my hostname and ip domain-name configured. I'll also give you a dir flash: below if it's at all of use: better#dir flash: Directory of flash:/ 2 -rw- 2748 Jul 27 2009 14:03:52 +00:00 sdmconfig-2811.cfg 3 -rw- 931840 Jul 27 2009 14:04:10 +00:00 es.tar 4 -rw- 1505280 Jul 27 2009 14:04:32 +00:00 common.tar 5 -rw- 1038 Jul 27 2009 14:04:46 +00:00 home.shtml 6 -rw- 112640 Jul 27 2009 14:05:00 +00:00 home.tar 7 -rw- 1697952 Jul 27 2009 14:05:26 +00:00 securedesktop-ios-3.1.1.45-k9.pkg 8 -rw- 415956 Jul 27 2009 14:05:46 +00:00 sslclient-win-1.1.4.176.pkg 9 -rw- 38732900 Dec 8 2011 06:28:56 +00:00 c2800nm-advsecurityk9-mz.124-24.T6.bin 64016384 bytes total (20598784 bytes free) better#

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  • Having trouble with a workaround, for booting from a usb stick, using grub and a minimal linux kernel to load usb drivers

    - by s hanley
    I'm trying to boot from a usb stick. I formatted it to fat32, and later to ext2, and installed dsl on it using unetbootin, and later the usb install guide on dsl wiki (http://www.damnsmalllinux.org/wiki/index.php/Install_to_USB_From_within_Linux). The bios doesn't have a setting for booting from usb. Grub doesn't "see" the usb drive when I use the root and find commands, explained in (http://www.damnsmalllinux.org/wiki/index.php/USB_Booting). This happens even when I set boot from floppy at the top of the boot order. However, my usb keyboard is recognised by the bios and by grub. How can it recognise the keyboard but not the usb drive? Also, the usb led does flash even before grub starts up, so surely something must be happening usb-wise? I am now following an ubuntu guide to booting from a USB stick, using a hdd-based, minimal linux kernel to supply the usb drivers. But I'm having difficulty adapting it to other OSes (slax/dsl/aptosid). I believe I have to alter the initrd.gz file to include usb drivers and then copy that file along with vmlinuz to a partition on my hdd. But, what's the grub command for the kernel line supposed to look like? From the ubuntu example it's: title USB FLASH DRIVE root (hd0,6) kernel /boot/usb-boot/vmlinuz file=/cdrom/preseed/ubuntu.seed boot=casper noprompt cdrom-detect/try-usb=true persistent initrd /boot/usb-boot/initrd.lz boot Should mine just be: title USB FLASH DRIVE root (hd0,6) kernel /boot/usb-boot/vmlinuz cdrom-detect/try-usb=true initrd /boot/usb-boot/initrd.lz boot

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  • Windows 8 install from USB freezes

    - by Rafael Almeida
    I'm trying to install Windows 8 from an 8GB Kingston Data Traveler. I'm currently using the Windows 7 USB DVD Download Tool to put the iso into the flash drive. It copies the files, but in the end it says it 'had a problem with bootsect' and could not make the flash drive bootable. This seems to be because my current system is Windows 7 32bits, and the bootsect.exe in the ISO is a 64-bit executable. Then I downloaded the 32-bit bootsect.exe and made the drive bootable by running: bootsect /nt60 E: /mbr Then I restarted and managed to boot via the flash drive, but now everything is very slow. It takes about two minutes for the initial black screen with the Windows logo and the spinner go away, then it goes to a purple-ish blank screen that stays on for about five more minutes and then it finally shows a dialog asking for the installation, date/time and keyboard languages. I input then, click "Install Now" and it takes about three more minutes with a "Setup is starting" screen. After that, the PC apparently reboots, the CPU fan speeds up considerably, and there's no video and nothing more happens even after more than ten minutes. What is happening? I already tried using another USB port and even installing from a Samsung G3 Station 2TB external hard disk, but the same thing happens. The file transfer speed to the Kingston drive was about only 3 megabytes per second.

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  • Moving from 1 Linux Partition to Many over USB Mount

    - by Mistiry
    We have devices which use Compact Flash for storage. They work OK, but we recently got industrial-grade CF cards to start using. One of the major problems we get is corruption on the flash card. As it is now, these flash cards run Debian with everything in a single partition. We want to have multiple partitions on the new industrial CF cards to help avoid some of the corruption problems. I booted up the device, and attached a USB CF reader. I then used fdisk to partition the CF card in the USB reader. How can I move the data to these partitions so that it works? I have a partition for each of these directories: /lib /var /root /boot /tmp /home /etc / swap space I imagine I can't just use rsync - do I need to attach a second CF reader with a copy of the CF card, so that it's not active and in-use - and then copy from the first reader to the second? How will the system know where to find its files? I know I'd have to change fstab, but that resides in /etc, which will be on a separate partition...how will it find the fstab file if it can't find /etc? And what about grub? I'm at a loss, perhaps its just because I'm under the weather, or I'm just missing a piece of logic here... Any help is greatly appreciated, this is somewhat urgent as our existing stock is nearing its end and we don't want to purchase anything but these industrial cards, but need to get it working with partitions.

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  • cookieless sessions with ajax

    - by thezver
    ok, i know you get sick from this subject. me too :( I've been developing a quite "big application" with PHP & kohana framework past 2 years, somewhat-successfully using my framework's authentication mechanism. but within this time, and as the app grown, many concerning state-preservation issues arisen. main problems are that cookie-driven sessions: can't be used for web-service access ( at least it's really not nice to do so.. ) in many cases problematic with mobile access don't allow multiple simultaneous apps on same browser ( can be resolved by hard trickery, but still.. ) requires many configurations and mess to work 100% right, and that's without the --browser issues ( disabled cookies, old browsers bugs & vulnerabilities etc ) many other session flaws stated in this old thread : http://lists.nyphp.org/pipermail/talk/2006-December/020358.html After a really long research, and without any good library/on-hand-solution to feet my needs, i came up with a custom solution to majority of those problems . Basically, i'ts about emulating sessions with ajax calls, with additional security/performance measures: state preserved by interchanging SID(+hash) with client on ajax calls. state data saved in memcache(or equivalent), indexed by SID security achieved by: appending unpredictible hash to SID egenerating hash on each request & validating it validating fingerprint of client on each request ( referrer,os,browser etc) (*)condition: ajax calls are not simultaneous, to prevent race-condition with session token. (hopefully Ext-Direct solves that for me) From the first glance that supposed to be not-less-secure than equivalent cookie-driven implementation, and at the same time it's simple, maintainable, and resolves all the cookies flaws.. But i'm really concerned because i often hear the rule "don't try to implement custom security solutions". I will really appreciate any serious feedback about my method, and any alternatives. also, any tip about how to preserve state on page-refresh without cookies would be great :) but thats small technical prob. Sorry if i overlooked some similar post.. there are billions of them about sessions . Big thanks in advance ( and for reading until here ! ).

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  • How to encrypt Amazon CloudFront signature for private content access using canned policy

    - by Chet
    Has anyone using .net actually worked out how to successfully sign a signature to use with CloudFront private content? After a couple of days of attempts all I can get is Access Denied. I have been working with variations of the following code and also tried using OpenSSL.Net and AWSSDK but that does not have a sign method for RSA-SHA1 yet. The signature (data) looks like this {"Statement":[{"Resource":"http://xxxx.cloudfront.net/xxxx.jpg","Condition":?{"DateLessThan":?{"AWS:EpochTime":1266922799}}}]} This method attempts to sign the signature for use in the canned url. So of the variations have included chanding the padding used in the has and also reversing the byte[] before signing as apprently OpenSSL do it this way. public string Sign(string data) { using (SHA1Managed SHA1 = new SHA1Managed()) { RSACryptoServiceProvider provider = new RSACryptoServiceProvider(); RSACryptoServiceProvider.UseMachineKeyStore = false; // Amazon PEM converted to XML using OpenSslKey provider.FromXmlString("<RSAKeyValue><Modulus>....."); byte[] plainbytes = System.Text.Encoding.UTF8.GetBytes(data); byte[] hash = SHA1.ComputeHash(plainbytes); //Array.Reverse(sig); // I have see some examples that reverse the hash byte[] sig = provider.SignHash(hash, "SHA1"); return Convert.ToBase64String(sig); } } Its useful to note that I have verified the content is setup correctly in S3 and CloudFront by generating a CloudFront canned policy url using my CloudBerry Explorer. How do they do it? Any ideas would be much appreciated. Thanks

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  • What's the recommended implemenation for hashing OLE Variants?

    - by Barry Kelly
    OLE Variants, as used by older versions of Visual Basic and pervasively in COM Automation, can store lots of different types: basic types like integers and floats, more complicated types like strings and arrays, and all the way up to IDispatch implementations and pointers in the form of ByRef variants. Variants are also weakly typed: they convert the value to another type without warning depending on which operator you apply and what the current types are of the values passed to the operator. For example, comparing two variants, one containing the integer 1 and another containing the string "1", for equality will return True. So assuming that I'm working with variants at the underlying data level (e.g. VARIANT in C++ or TVarData in Delphi - i.e. the big union of different possible values), how should I hash variants consistently so that they obey the right rules? Rules: Variants that hash unequally should compare as unequal, both in sorting and direct equality Variants that compare as equal for both sorting and direct equality should hash as equal It's OK if I have to use different sorting and direct comparison rules in order to make the hashing fit. The way I'm currently working is I'm normalizing the variants to strings (if they fit), and treating them as strings, otherwise I'm working with the variant data as if it was an opaque blob, and hashing and comparing its raw bytes. That has some limitations, of course: numbers 1..10 sort as [1, 10, 2, ... 9] etc. This is mildly annoying, but it is consistent and it is very little work. However, I do wonder if there is an accepted practice for this problem.

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  • Algorithm for converting hierarchical flat data (w/ ParentID) into sorted flat list w/ indentation l

    - by eagle
    I have the following structure: MyClass { guid ID guid ParentID string Name } I'd like to create an array which contains the elements in the order they should be displayed in a hierarchy (e.g. according to their "left" values), as well as a hash which maps the guid to the indentation level. For example: ID Name ParentID ------------------------ 1 Cats 2 2 Animal NULL 3 Tiger 1 4 Book NULL 5 Airplane NULL This would essentially produce the following objects: // Array is an array of all the elements sorted by the way you would see them in a fully expanded tree Array[0] = "Airplane" Array[1] = "Animal" Array[2] = "Cats" Array[3] = "Tiger" Array[4] = "Book" // IndentationLevel is a hash of GUIDs to IndentationLevels. IndentationLevel["1"] = 1 IndentationLevel["2"] = 0 IndentationLevel["3"] = 2 IndentationLevel["4"] = 0 IndentationLevel["5"] = 0 For clarity, this is what the hierarchy looks like: Airplane Animal Cats Tiger Book I'd like to iterate through the items the least amount of times possible. I also don't want to create a hierarchical data structure. I'd prefer to use arrays, hashes, stacks, or queues. The two objectives are: Store a hash of the ID to the indentation level. Sort the list that holds all the objects according to their left values. When I get the list of elements, they are in no particular order. Siblings should be ordered by their Name property. Update: This may seem like I haven't tried coming up with a solution myself and simply want others to do the work for me. However, I have tried coming up with three different solutions, and I've gotten stuck on each. One reason might be that I've tried to avoid recursion (maybe wrongly so). I'm not posting the partial solutions I have so far since they are incorrect and may badly influence the solutions of others.

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  • How to Create Deterministic Guids

    - by desigeek
    In our application we are creating Xml files with an attribute that has a Guid value. This value needed to be consistent between file upgrades. So even if everything else in the file changes, the guid value for the attribute should remain the same. One obvious solution was to create a static dictionary with the filename and the Guids to be used for them. Then whenever we generate the file, we look up the dictionary for the filename and use the corresponding guid. But this is not feasible coz we might scale to 100's of files and didnt want to maintain big list of guids. So another approach was to make the Guid the same based on the path of the file. Since our file paths and application directory structure are unique, the Guid should be unique for that path. So each time we run an upgrade, the file gets the same guid based on its path. I found one cool way to generate such 'Deterministic Guids' (Thanks Elton Stoneman). It basically does this: private Guid GetDeterministicGuid(string input) { //use MD5 hash to get a 16-byte hash of the string: MD5CryptoServiceProvider provider = new MD5CryptoServiceProvider(); byte[] inputBytes = Encoding.Default.GetBytes(input); byte[] hashBytes = provider.ComputeHash(inputBytes); //generate a guid from the hash: Guid hashGuid = new Guid(hashBytes); return hashGuid; } So given a string, the Guid will always be the same. Are there any other approaches or recommended ways to doing this? What are the pros or cons of that method?

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  • Rails 3: Parsing XML

    - by gjb
    I have a simple XML document in the following format: <?xml version="1.0" encoding="utf-8"?> <object> <strField>Foo</strField> <intField>1</intField> <dateField>2010-11-03</dateField> <boolField>true</boolField> <nilField></nilField> </object> I would like to parse this into a Hash to be passed to Model.create: {:object => { :strField => 'Foo', :intField => 1, :dateField => Date.today, :boolField => true, :nilField => nil }} Sadly there are no "type" attributes in the XML, so using Hash.from_xml just parses each field as a string. What I am looking for is some sort of field type auto detection. I have also looked at Nokogiri, but that can't output as a Hash. What is the simplest and most efficient way to achieve this? Many thanks.

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  • Traversing from Bookmark Hashtags (#bookmark) in jQuery?

    - by HipHop-opatamus
    I am having trouble traversing from a bookmark has tag in jquery. Specifically, the following HTML: <a id="comment-1"></a> <div class="comment"> <h2 class="title"><a href="#comment-1">1st Post</a></h2> <div class="content"> <p>this is 1st reply to the original post</p> </div> <div class="test">1st post second line</div> </div> I am trying to traverse to where the class = "title", if the page is landed on with a bookmark hashtag in the URL (site.com/test.html#comment-1). The following is my code I'm using for testing: if(window.location.hash) { alert ($(window.location.hash).nextAll().html()); } It executes fine, and returns the appropriate html ( The problem is if I add a selector to it ($(window.location.hash).next('.title').html() ) I get a null result. Why is this so? Is nextAll not the correct Traversing function? (I've also tried next+find to no avail) Thanks!

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  • Parsing files "/etc/default" using java

    - by rmarimon
    I'm trying to parse the configuration files usually found in /etc/default using java and regular expressions. So far this is the code I have iterating over every line on each file: // remove comments from the line int hash = line.indexOf("#"); if (hash >= 0) { line = line.substring(0, hash); } // create the patterns Pattern doubleQuotePattern = Pattern.compile("\\s*([a-zA-Z_][a-zA-Z_0-9]*)\\s*=\\s*\"(.*)\"\\s*"); Pattern singleQuotePattern = Pattern.compile("\\s*([a-zA-Z_][a-zA-Z_0-9]*)\\s*=\\s*\\'(.*)\\'\\s*"); Pattern noQuotePattern = Pattern.compile("\\s*([a-zA-Z_][a-zA-Z_0-9]*)\\s*=(.*)"); // try to match each of the patterns to the line Matcher matcher = doubleQuotePattern.matcher(line); if (matcher.matches()) { System.out.println(matcher.group(1) + " == " + matcher.group(2)); } else { matcher = singleQuotePattern.matcher(line); if (matcher.matches()) { System.out.println(matcher.group(1) + " == " + matcher.group(2)); } else { matcher = noQuotePattern.matcher(line); if (matcher.matches()) { System.out.println(matcher.group(1) + " == " + matcher.group(2)); } } } This works as I expect but I'm pretty sure that I can make this way smaller by using better regular expression but I haven't had any luck. Anyone know of a better way to read these types of files?

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  • Memcache key generation strategy

    - by Maxim Veksler
    Given function f1 which receives n String arguments, would be considered better random key generation strategy for memcache for the scenario described below ? Our Memcache client does internal md5sum hashing on the keys it gets public class MemcacheClient { public Object get(String key) { String md5 = Md5sum.md5(key) // Talk to memcached to get the Serialization... return memcached(md5); } } First option public static String f1(String s1, String s2, String s3, String s4) { String key = s1 + s2 + s3 + s4; return get(key); } Second option /** * Calculate hash from Strings * * @param objects vararg list of String's * * @return calculated md5sum hash */ public static String stringHash(Object... strings) { if(strings == null) throw new NullPointerException("D'oh! Can't calculate hash for null"); MD5 md5sum = new MD5(); // if(prevHash != null) // md5sum.Update(prevHash); for(int i = 0; i < strings.length; i++) { if(strings[i] != null) { md5sum.Update("_" + strings[i] + "_"); // Convert to String... } else { // If object is null, allow minimum entropy by hashing it's position md5sum.Update("_" + i + "_"); } } return md5sum.asHex(); } public static String f1(String s1, String s2, String s3, String s4) { String key = stringHash(s1, s2, s3, s4); return get(key); } Note that the possible problem with the second option is that we are doing second md5sum (in the memcache client) on an already md5sum'ed digest result. Thanks for reading, Maxim.

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  • How can I randomly iterate through a large Range?

    - by void
    I would like to randomly iterate through a range. Each value will be visited only once and all values will eventually be visited. For example: class Array def shuffle ret = dup j = length i = 0 while j > 1 r = i + rand(j) ret[i], ret[r] = ret[r], ret[i] i += 1 j -= 1 end ret end end (0..9).to_a.shuffle.each{|x| f(x)} where f(x) is some function that operates on each value. A Fisher-Yates shuffle is used to efficiently provide random ordering. My problem is that shuffle needs to operate on an array, which is not cool because I am working with astronomically large numbers. Ruby will quickly consume a large amount of RAM trying to create a monstrous array. Imagine replacing (0..9) with (0..99**99). This is also why the following code will not work: tried = {} # store previous attempts bigint = 99**99 bigint.times { x = rand(bigint) redo if tried[x] tried[x] = true f(x) # some function } This code is very naive and quickly runs out of memory as tried obtains more entries. What sort of algorithm can accomplish what I am trying to do? [Edit1]: Why do I want to do this? I'm trying to exhaust the search space of a hash algorithm for a N-length input string looking for partial collisions. Each number I generate is equivalent to a unique input string, entropy and all. Basically, I'm "counting" using a custom alphabet. [Edit2]: This means that f(x) in the above examples is a method that generates a hash and compares it to a constant, target hash for partial collisions. I do not need to store the value of x after I call f(x) so memory should remain constant over time. [Edit3/4/5/6]: Further clarification/fixes.

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  • Java XMLRPC request-String

    - by Philip
    Hi, I'm using Apache XML-RPC 3.1.2 to talk to an online-service. They have something special, they need a hash over the whole XML with a secret key for some kind of security, like this: String hash = md5(xmlRequest + secretKey); String requestURL = "http://foo.bar/?authHash=" + hash; So I need the XML-request like this: <?xml version="1.0"?> <methodCall> <methodName>foo.bar</methodName> <params> <param> <value><struct> <member><name>bla</name> <value><int>1</int></value> </member> <member><name>blubb</name> <value><int>2</int></value> </member> </struct></value> </param> </params> </methodCall> But how do I get this String-representation of the XMLRPC-Request with the lib Apache XML-RPC?

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