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  • Python2 or Python3?

    - by Michael
    I'm just starting to learn Python, but just to use my time more efficiently, would you recommend to read Python2 or start directly from Python3? I'm about "Dive into Python". Is it similar to start reading PHP4 or PHP5? I'm trying to understand whether it's worth spending time on Python2 literature.

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  • Speed boost to adjacency matrix

    - by samoz
    I currently have an algorithm that operates on an adjacency matrix of size n by m. In my algorithm, I need to zero out entire rows or columns at a time. My implementation is currently O(m) or O(n) depending on if it's a column or row. Is there any way to zero out a column or row in O(1) time?

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  • Optimum configuration of McAfee for Servers

    - by Wayne Arthurton
    Our corporate standard is McAfee Enterprise, unfortunately this is non-negotiable. On two types of servers I'm responsible for, SQL & Web, we have noticed major performance issues with the corporate standard setup. Max scan time 45sec One policy for all processes Scan ALL files on write, read and open for backup Heuristics: Find unknown programs, trojans and macros Detect unwanted programs Exclude: EVT, LDF, LOG, MDF, VMD, , windows file protection) This of course still causes major slowdowns. IIS .NET recompiles are slow especially with SharePoint, SQL backups and restores, SQL Analysis Services, Integration Services and temp data from them as well. I have looked from time to time, for some best practices on setting up McAfee of SQL & SQL Analysis Service, SQL Integration Service, Visual Studio, Sharepoint, and .NET web servers in general. How do people setup McAfee enterprise on their corporate serves keeping security intact, but affecting performance as minimally as possible? Has anyone run across white papers on these setups? Obviously some are case by case, but there must be some best practices out there somewhere.

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  • Flex PureMVC: Mediator not registering

    - by LazerWonder
    A component is created at runtime and a mediator is created and registered. All is well. In a separate view, another instance of that component is created. The mediator is created but onRegister() isn't called the 2nd time. I don't know if this is normal... but if it is, how do I get it to call onRegister() the second time? Thanks. :)

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  • No audio input deviced are installed

    - by Meowbits
    If I go to Sound Recording Devices and it says "No audio devices are installed" If I click to set up a microphone I get an error "Wizard could not launch, No audio input device found, make sure your audio hardware is working properly and check your audio configuration in the Audio Devices and Sound Themes control panel. Where can I get an audio input device? I just want something so I can actually use the microphone on my headset. This is ridiculous. I have tried to look for any file but I simply cannot find a way to add an audio input device... I really do not want to format my computer just for this problem but I am starting to feel like that is the only option I have. I have the latest chipsets

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  • AVAudioPlayer crash after playing from an AVAudioRecord

    - by munchine
    I've got a button the user tap to start recording and tap again to stop. When it stop I want the recorded voice 'echo' back so the user can hear what was recorded. This works fine the first time. If I hit the button for the third time, it starts a new recording and when I hit stop it crashes with EXC_BAD_ACCESS. - (IBAction) readToMeTapped { if(recording) { recording = NO; [readToMeButton setTitle:@"Stop Recording" forState: UIControlStateNormal ]; NSMutableDictionary *recordSetting = [[NSDictionary alloc] initWithObjectsAndKeys: [NSNumber numberWithFloat: 44100.0], AVSampleRateKey, [NSNumber numberWithInt: kAudioFormatAppleLossless], AVFormatIDKey, [NSNumber numberWithInt: 1], AVNumberOfChannelsKey, [NSNumber numberWithInt: AVAudioQualityMax], AVEncoderAudioQualityKey, nil]; // Create a new dated file NSDate *now = [NSDate dateWithTimeIntervalSinceNow:0]; NSString *caldate = [now description]; recordedTmpFile = [NSURL fileURLWithPath:[[NSString stringWithFormat:@"%@/%@.caf", DOCUMENTS_FOLDER, caldate] retain]]; error = nil; recorder = [[ AVAudioRecorder alloc] initWithURL:recordedTmpFile settings:recordSetting error:&error]; if(!recorder){ NSLog(@"recorder: %@ %d %@", [error domain], [error code], [[error userInfo] description]); UIAlertView *alert = [[UIAlertView alloc] initWithTitle: @"Warning" message: [error localizedDescription] delegate: nil cancelButtonTitle:@"OK" otherButtonTitles:nil]; [alert show]; [alert release]; return; } NSLog(@"Using File called: %@",recordedTmpFile); //Setup the recorder to use this file and record to it. [recorder setDelegate:self]; [recorder prepareToRecord]; [recorder recordForDuration:(NSTimeInterval) 5]; //recording for a limited time } else { // it crashes the second time it gets here! recording = YES; NSLog(@"Recording YES Using File called: %@",recordedTmpFile); [readToMeButton setTitle:@"Start Recording" forState:UIControlStateNormal ]; [recorder stop]; //Stop the recorder. //playback recording AVAudioPlayer * newPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:recordedTmpFile error:&error]; [recordedTmpFile release]; self.aPlayer = newPlayer; [newPlayer release]; [aPlayer setDelegate:self]; [aPlayer prepareToPlay]; [aPlayer play]; } } - (void)audioRecorderDidFinishRecording:(AVAudioRecorder *)sender successfully:(BOOL)flag { NSLog (@"audioRecorderDidFinishRecording:successfully:"); [recorder release]; recorder = nil; } Checking the debugger, it flags the error here @synthesize aPlayer, recorder; This is the part I don't understand. I thought it may have something to do with releasing memory but I've been careful. Have I missed something?

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  • Apache virtual host for drupal test site

    - by bsreekanth
    Hello, I am a programmer, trying to launch my first website.. through different helpful posts in sf and others, I setup an account with Linode and set up a slice (Debian, Apache, ..etc). I have a Drupal site under development, and like to have a test site in the Linode server as well. Now, I like to have a site setup with the following requirement. What is the best way to setup and protect the test site along with the actual (production) site?. Is virtual host is the answer? To protect the test site, is .htaccess authentication sufficient to prevent access from public and robots? I also modifying the theme, database contents etc, so having two sites under one drupal installation may not be good idea . what do u suggest? thanks in advance. bsreekanth.

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  • Diverting sound output of MCE to SPDIF

    - by Saxtus
    I have an ASUS SupremeFX II audio card (which in fact is an onboard audio riser slot) with the default drivers that are pre-installed by Windows 7 x64 for this card. I am able to manually switch between analog output and SPDIF output by the means of control panel (or external utilities like STADS), a change that affects all applications. The problem is that by doing that every time I am about to launch Windows Media Center, except that it's not that elegant, also makes all other Windows application's sounds to pass through SPDIF too, bypassing analog output completely, blending with what I am watching at Windows Media Center. Is there a way to make SPDIF as the default playback device for Windows Media Center? I know other programs that have a setting like that (foobar2000 for example) working like charm, allowing me to even have different outputs working at the same time (tested with my current card successfully). But when comes to Windows Media Center... it just use what the default playback device is all the time. The only setting that I know of, is under: Settings General Windows Media Center Setup Set Up Your Speakers and what it does is to just change the default playback device for entire system. Please help!

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  • I am under DDoS. What can I do?

    - by Falcon Momot
    This is a Canonical Question about DoS and DDoS mitigation. I found a massive traffic spike on a website that I host today; I am getting thousands of connections a second and I see I'm using all 100Mbps of my available bandwidth. Nobody can access my site because all the requests time out, and I can't even log into the server because SSH times out too! This has happened a couple times before, and each time it's lasted a couple hours and gone away on its own. Occasionally, my website has another distinct but related problem: my server's load average (which is usually around .25) rockets up to 20 or more and nobody can access my site just the same as the other case. It also goes away after a few hours. Restarting my server doesn't help; what can I do to make my site accessible again, and what is happening? Relatedly, I found once that for a day or two, every time I started my service, it got a connection from a particular IP address and then crashed. As soon as I started it up again, this happened again and it crashed again. How is that similar, and what can I do about it?

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  • OOP vs PP for algorithms

    - by Ilian
    Which paradigm is better for design and analysis of algorithms? Which is faster? Because I have a subject called Design and Analysis of Algorithms in university and have a time limit for programs. Is OOP slower than Procedure programming? Or the time difference is not big?

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  • How to setup a webserver in common lisp?

    - by Serpico
    Several months ago, I was inspired by the magnificent book ANSI Common Lisp written by Paul Graham, and the statement that Lisp could be used as a secret weapon in your web development, published by the same author on his blog. Wow, that is amazing. That is something that I have been looking for long time. The author really developed a successful web applcation and sold it to Yahoo. With those encouraging images, I determined to spend some time (1 year or 2 year, who knows) on learning Common Lisp. Maybe someday I will development my web application and turn into a great Lisp expert. In fact, this is the second time for me to get to study Lisp. The first time was a couple of years ago when I was fascinated by the famous book SICP but found later Scheme was so unbelievably immature for real life application. After reading some chapters of ANSI Common Lisp, I was pretty sure that is a great book full of detailed exploration of Common Lisp. Then I began to set up a web server in Common Lisp. After all, this should be the best way if you want to learn something. Demonstrations are always better than definations. As suggested by the book Practical Common Lisp (by the way, this is also a great book), I chose to install AllegroServe on some Common Lisp implementation. Then, from somewhere else, I learned that Hunchentoot seems to be better than AllegroServe. (I don't remember where and whom this word is from. So don't argue with me.) Ironically, you know what, I never could installed the two packages on any Common Lisp implementation. More annoyingly, I even don't know why. The machine always spit up a lot of jargon and lead me into a chaos. I've tried searching the internet and have not found anything. Could anybody who has successfully installed these packages in Linux tell me how you did it? Have you run into any trouble? How did you figured out what is wrong and fixed it? The more detailed, the more helpful.

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  • Primary zone will not transfer to secondary zone

    - by Matt Beckman
    Using DNS on Windows Server 2008, there is a constant struggle with adding primary and secondary zones. I will add a primary zone to NS1 for a new domain, edit it as needed, and when it's ready add the secondary zone to NS2. However, MOST of the time, the secondary zone remains in an error state, and will never acquire the primary zone data. I have gone back to domains a few weeks after adding them to find out that Windows never propagated the change. Annoying. Anyway, I recently updated SP1 to SP2 thinking this would help, but it hasn't. I added two new domains today, and spent an hour after the secondary zone would just not sync. During that time, the only error in the logs I had seen was for one of them where DNS complained about not being authoritative. In order to eventually resolve the issue, I ended up deleting the primary zone, creating a new primary zone, and hitting "Apply" after each and every field change. For example, after modifying the serial number from "1" to a date appropriate "2010093001", I hit apply, and then the Primary Server (apply), Responsible Person (apply), and finally Name Servers (apply). After I did this, the secondary zone didn't waste any time getting the data. Ideas?

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  • Defeating the RAID5 write hole with ZFS (but not RAID-Z) [closed]

    - by Michael Shick
    I'm setting up a long-term storage system for keeping personal backups and archives. I plan to have RAID5 starting with a relatively small array and adding devices over time to expand storage. I may also want to convert to RAID6 down the road when the array gets large. Linux md is a perfect fit for this use case since it allows both of the changes I want on a live array and performance isn't at all important. Low cost is also great. Now, I also want to defend against file corruption, so it looked like a RAID-Z1 would be a good fit, but evidently I would only be able to add additional RAID5 (RAID-Z1) sets at a time rather than individual drives. I want to be able to add drives one at a time, and I don't want to have to give up another device for parity with every expansion. So at this point, it looks like I'll be using a plain ZFS filesystem on top of an md RAID5 array. That brings me to my primary question: Will ZFS be able to correct or at least detect corruption resulting from the RAID5 write hole? Additionally, any other caveats or advice for such a set up is welcome. I'll probably be using Debian, but I'll definitely be using Linux since I'm familiar with it, so that means only as new a version of ZFS as is available for Linux (via ZFS-FUSE or so).

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  • Backup software for incremental swapped-out drives?

    - by user13743
    We're using Acronis Home 11 to backup our main Windows machine at the office. We have a set of portable hard drives that we swap out each week, for redundancy. We have incremental sets ( a new diff of the entire series each night) building on each drive. However, from time to time, Acronis gets confused and sometimes makes a new full backup. This eats up a lot of drive on the disks. Also, I have to trick the Acronis script each time I swap out a drive and point it to the new incremental backup set. Finally, if a drive gets full, there's no way to partition the backup set on a drive. I found this out the hard way, and now one drive is full with one backup set. So now on the other drive, I have three folders of backup sets. When one starts to get full, I delete the oldest one and start a new set. That way one single drive never gets filled up with one single backup set. I'm looking for a backup software that can backup Windows in incremental sets, and doesn't get tripped up with swapped out drives. Is there a better solution?

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  • cfengine3 file_copy only on source side change

    - by megamic
    I am using the 'digest' copy method for all file copy promises, because of the way we package and deploy software, I cant rely on mtime for the criteria for updating files. For various reasons, I am not employing the client-server approach with a central configuration server: rather we package and deploy our entire configuration module to each server, so from cf-engine's perspective, the source and target are local on the server it is running. The problem I am having with this approach is that the source will always update the target when they differ - which is what I want most of the time, usually because the source has been updated. However, like many other cfengine users, we are running an operational environment, where occasionally emergency fixes have to be applied immediately - meaning we don't have time to rebuild and redeploy a configuration module, and the fix will often be applied by deploying a tarball with specific changes. Of course this is problematic if cf-engine comes along 5 mintues later and reverts the changes. What we would like is to be able to make small, incremental changes to our servers, without them being reverted, until the next deployment cycle at which time the new source files would be copied. We do not consider random file corruption or mistaken changes to involve enough risk to warrant having cfengine constantly revert deployments to their source copy - the ability to deploy emergency fixes and have them stay that way until the next deployment would be of much greater value and utility. So, after all that, my question is this: is cf-engine capable of detecting whether it was the source or target that changed when the files differ, and if so, is their a way to use the 'digest' copy method but only if the source side changed? I am very open to other ideas and approaches as-well, as I am still quite new to this whole configuration management thing.

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  • How to group a serial of objects according to timestamp

    - by Benny
    I have a serial of object defined as: public class Foo { public DateTime Time {get;set;} } now I want to group objects(IEnumerable<Foo>) according to the time, e.g. I want to group them according to hour or day or month. for example (group into hour): group 1(13:00-14:00) : foo1, foo2, foo3 group 2(14:00-15:00): foo4, foo5 How to write LINQ? hope I made myself clear.

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  • How we should load the MFMailViewController in cocos2d ?

    - by srikanth rongali
    I am writing an app in using cocos2d. This method I have written for the selector goToFirstScreen: . The view is in landscape mode. I need to send an email. So, I need to launch the MFMailComposeViewController. I need it in portrait mode. But, the control is not entering in to viewDidLoad of the mailMe class. The problem is in goToScreen: method. But, I do not get where I am wrong ? -(void)goToFirstScreen:(id)sender { NSLog(@"goToFirstScreen: "); CCScene *Scene = [CCScene node]; CCLayer *Layer = [mailME node]; [Scene addChild:Layer]; [[CCDirector sharedDirector] setAnimationInterval:1.0/60]; [[CCDirector sharedDirector] pushScene: Scene]; } This is my mailMe class to launch mail controller #import <UIKit/UIKit.h> #import <MessageUI/MessageUI.h> #import <MessageUI/MFMailComposeViewController.h> #import "cocos2d.h" @interface mailME : CCLayer <MFMailComposeViewControllerDelegate> { UIViewController *mailComposer; } -(void)displayComposerSheet; -(void)launchMailAppOnDevice; @end #import "mailME.h" @implementation mailME -(void)viewDidLoad { NSLog(@"Enetrd in to mail"); Class mailClass = (NSClassFromString(@"MFMailComposeViewController")); if (mailClass != nil) { if ([mailClass canSendMail]) { [self displayComposerSheet]; } else { [self launchMailAppOnDevice]; } } else { [self launchMailAppOnDevice]; } } -(void)displayComposerSheet { CCDirector *director = [CCDirector sharedDirector]; [director pause]; [director stopAnimation]; [director.openGLView setUserInteractionEnabled:NO]; mailComposer = [[UIViewController alloc] init]; [mailComposer setView:[[CCDirector sharedDirector]openGLView]]; [mailComposer setModalTransitionStyle:UIModalTransitionStyleCoverVertical]; MFMailComposeViewController *picker = [[MFMailComposeViewController alloc] init]; picker.mailComposeDelegate = self; [picker setSubject:@"Hello!"]; NSArray *toRecipients = [NSArray arrayWithObject:@"[email protected]"]; [picker setToRecipients:toRecipients]; NSString *emailBody = @"It is not working!"; [picker setMessageBody:emailBody isHTML:YES]; [mailComposer presentModalViewController:picker animated:NO]; [picker release]; } - (void)mailComposeController:(MFMailComposeViewController*)controller didFinishWithResult:(MFMailComposeResult)result error:(NSError*)error { switch (result) { case MFMailComposeResultCancelled: break; case MFMailComposeResultSaved: break; case MFMailComposeResultSent: break; case MFMailComposeResultFailed: break; default: break; } [mailComposer dismissModalViewControllerAnimated:NO]; [[UIApplication sharedApplication] setStatusBarOrientation:CCDeviceOrientationLandscapeLeft animated:NO]; CCDirector *director = [CCDirector sharedDirector]; [director.openGLView setUserInteractionEnabled:YES]; [director startAnimation]; [director resume]; [mailComposer.view.superview removeFromSuperview]; } -(void)launchMailAppOnDevice { NSString *recipients = @"mailto:[email protected]?&subject=Hello!"; NSString *body = @"&body=It is not working"; NSString *email = [NSString stringWithFormat:@"%@%@", recipients, body]; email = [email stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]; [[UIApplication sharedApplication] openURL:[NSURL URLWithString:email]]; } - (void)dealloc { [super dealloc]; } @end

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  • Mysql - Summary Tables

    - by jwzk
    Which method do you suggest and why? Creating a summary table and . . . 1) Updating the table as the action occurs in real time. 2) Running group by queries every 15 minutes to update the summary table. 3) Something else? The data must be near real time, it can't wait an hour, a day, etc.

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  • What is the fastest way to resize a large partition?

    - by Jook
    Due to a new HDD-Configuration I am currently handling larger backup/resize tasks with partitions between around 900MB, wich are 70-90% full. some background: First thing I've noticed was, that the Acronis-WesternDigital TrueImage was extremly slow while running it under Windows 7, even though on high priority. To create a normal backup for 650gb of data (900gb partition), it would have taken 3 days! The same task done with the boot-cd version of this acronis version took about 2 hours (SATA3 copy from one disk to another, both around 110MB/s). Now, after I have done all my backups, I've wanted to remove some obsolete partitions and resize the leftovers to full hdd size. Of course, usually this takes quite some time - in this case for this 900gb partition, to extend it to 931 (30gb+ from front, 1gb+ from end), it will take around 6 hours (using gparted)! Had I new that erlier, I would have just restored the image. But no - first it showed a reasonable time of 1:45h and 0 of 1 operations, but after finishing 1:45h it started again, only this time with 4h to go, still 0 of 1 operations, but now it was copying instead of moving. Question: However, why has it to be this slow to resize a partition? I am asking for a good explanaition. This has bugged me, since I started partitioning - why does it require to copy all the data around, can't it just stay in place?!

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  • Warning: fsockopen() [function.fsockopen]: unable to connect to

    - by mohanraj
    Domain name: textbox check box .com submit Warning: fsockopen() [function.fsockopen]: unable to connect to whois.crsnic.net:43 (A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond. ) in C:\xampp\htdocs\check domain.php on line 35 Fatal error: Maximum execution time of 60 seconds exceeded in C:\xampp\htdocs\check domain.php on line 35

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  • VNC authentication failure

    - by cf16
    I try to connect to my vncserver running on CentOs from home computer, behind firewall. I have installed Win7 and Ubuntu both on this machine. I have an error: VNC conenction failed: vncserver too many security failures even when loging with right credentials (I reset passwd on CentOs) I get: authentication failure. I observe that I have to wait a whole day to be able to relogin at all. Is it something regarding that I try as root? I think important is also that I have to login to remote Centos through port 6050 - none else port works for me. Do I have to do something with other ports? I see that vncserver is listening on 5901, 5902 if another added - and I consider connection is established because from time to time (long time) the passwd prompt appears,... right? I have created additional user1, password for him to CentOS and to VNC, also user2. I do: service vncserver start and two servers starts, one :1, and second on :2. When I try to connect to vncserverIP:1 I get what described above, but when I try connect to vncserverIP:2 it says that the trial was unsuccessful. please help, what to do? additionally: how to disable this lockout for a testing purposes?

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  • C# TabPage.Controls.Add too long

    - by Toto
    Hi, At run time, I add one control to a tabpage and I notice that it takes 0.5 sec to do it. It's rather long and I would like to reduce this time. I tried Suspend/ResumeLayout but for only one action it's no relevant and do not improved anythng. Any ideas ? Thx

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  • Get cookie expiration

    - by Ashish Rajan
    Is it possible to read cookie expiration time with php ? When I print_r($_COOKIE) it outputs: Array ( [PHPSESSID] => 0afef6bac83a7db8abd9f87b76838d7f [userId] => 1232 [userEmail] => [email protected] [firstName] => user [lastName] => user ) So I think $_COOKIE don't have the expiration time, is it possible with some other function?

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  • Clear content of UIScrollView

    - by Joy
    I have an iPhone application that uses a timer and every time it creates some UILabel and places it onto the UISrollview. What i want is to clear the scroll view every time before it puts UILabel onto the ScrollView. So guys please help me to clear the contents of the UIScrollView. I'm just not been able to do that. Looking for your reply

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  • How can I set a Windows user environment variable that takes effect for the current session?

    - by Graham Powell
    I am trying to set a Windows user environment variable and then launch an application via either batch file or a script. However, the environment variable is not set to the appropriate value until after the user logs off and logs back on. (I think a more accurate description would be that the new value is not available to the app until after the next logon.) Is there any way to set a variable in the user's environment so that it's immediately available? I'm doing this because this program's functionality can be controlled by environment variables, and users will need different functionality at different times. Because of license constraints I need to set this dynamically, if possible. Thanks, Graham

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