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  • Confusing If Statement?

    - by NetSide
    I always use If statement (In C#) as (1. Alternative); if (IsSuccessed == true) { // } I know that there is no need to write "== true" as (2. Alternative)); if (IsSuccessed) { // } But, I use it because it is more readable and cause no performance issue. Of course, this is my choice and I know many software developers prefer first alternative. What is the best usage, and Why?

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  • One log4j.xml - many scripts

    - by psed
    One of my utility jar files is used by different nix scripts, located in different categories. Problem: unable to initialize log4j framework (unable to find log4j.xml). Solution, that allows to configure logger correctly while launching jar classes by different scripts - usage of env vars and force configuring using DOMConfigurtor.configure(pathToConfXml) method. is it possible to avoid path hardcoding and configure logger inside of a script? Appreciate all your help. Thanks.

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  • Facebook application development resources

    - by Michael
    What is the most efficient way to start learning develop Facebook applications? Any web resource or book that you would recommend to start from? Any MUST READ or Bibles available for this? There are plenty of them in Amazon, but which one really worth to spend time? What kind of development technologies are used in this? Is PHP/MySQL/JS enough to jump in? Thanks

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  • Should I use AJAX or get every data beforehand

    - by rix501
    I have a web app where I need to change a drop down list dynamically depending on another drop down list. I have two options: Get all the data beforehand with PHP and "manage" it later with Javascript. Or get the data the user wants through AJAX. The thing is, that the page loads with all the data by default and the user can later select a sub category to narrow the drop downs. Which of the two options are better (faster, less resource intensive)?

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  • MVC can't find my Areas page

    - by Steven
    I created an Area in my application named Admin. It's pretty basic, looks like this: Areas Admin Controllers CompaniesController.cs Models Views Companies Index.aspx AdminAreaRegistration.cs When I try to view my Index page by going to /Admin/Companies, I get a "The resource cannot be found" message. I find it weird that I don't get any sort of error message. I'm not sure what's going on here, has anyone come across this?

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  • Calendar add() vs roll() when do we use it?

    - by Pentium10
    I know add() adds the specified (signed) amount of time to the given time field, based on the calendar's rules. And roll() adds the specified (signed) single unit of time on the given time field without changing larger fields. I can't think of an everyday usage of roll() I would do everything by add(). Can you help me out with examples when do we use roll() and when add()?

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  • Java threads for the beginner

    - by Boba
    I've been trying to explain Java threading to a colleague who has never been exposed to multi-threaded applications, but apparently I'm not a very good teacher. Can anyone recommend a good online or offline resource that can explain threading in a simple, step-by-step manner? I know it's a complex topic, but surely there exists an article, book, or other explanation that can result in an "Aha! I get it, finally!" moment.

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  • Editline with non-blocking input.

    - by Sasun Hambardzumyan
    I use editline library in my program, for user commands input in shell. But becides shell, program have a gui interface, so I need to run editline's readline() function in separate thread, because it blocks until Enter pressed. Is there a way to use readline() function without blocking, so I could avoid separate thread usage?

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  • Sample code for Anymote in C++ version?

    - by summerdog
    Does anyone can tell me where to find the resource just like the following link ? (But I hope this is for C++ !!) https://code.google.com/p/googletv-android-samples/source/browse/#git%2FAnymoteLibrary%2Fsrc%2Fcom%2Fexample%2Fgoogle%2Ftv%2Fanymotelibrary%2Fclient There is a dynamic library : http://code.google.com/p/google-tv-chrome-extensions/source/browse/AnymoteExample/?r=2048c59701bab6386f7ea8011e4ca342fb1f133a#AnymoteExample%2Fplugins%2Fgtvremote_AnymoteExample.plugin%2FContents%2FMacOS Unfortunately, the arch of this library is i386. I want to build this project for the other platform. Orz Thanks.

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  • mysql_query() returns returns true, but mysql_num_rows() and mysql_fetch_array() give "not a valid r

    - by zlance4012
    Here is the code in question: -----From index.php----- require_once('includes/DbConnector.php'); // Create an object (instance) of the DbConnector $connector = new DbConnector(); // Execute the query to retrieve articles $query1 = "SELECT id, title FROM articles ORDER BY id DESC LIMIT 0,5"; $result = $connector-query($query1); echo "vardump1:"; var_dump($result); echo "\n"; /(!line 17!)/ echo "Number of rows in the result of the query:".mysql_num_rows($result)."\n"; // Get an array containing the results. // Loop for each item in that array while ($row = $connector-fetchArray($result)){ echo ' '; echo $row['title']; echo ' '; -----end index.php----- -----included DbConnector.php----- $settings = SystemComponent::getSettings(); // Get the main settings from the array we just loaded $host = $settings['dbhost']; $db = $settings['dbname']; $user = $settings['dbusername']; $pass = $settings['dbpassword']; // Connect to the database $this-link = mysql_connect($host, $user, $pass); mysql_select_db($db); register_shutdown_function(array(&$this, 'close')); } //end constructor //* Function: query, Purpose: Execute a database query * function query($query) { echo "Query Statement: ".$query."\n"; $this-theQuery = $query; return mysql_query($query, $this-link) or die(mysql_error()); } //* Function: fetchArray, Purpose: Get array of query results * function fetchArray($result) { echo "<|"; var_dump($result); echo "| \n"; /(!line 50!)/$res= mysql_fetch_array($result) or die(mysql_error()); echo $res['id']."-".$res['title']."-".$res['imagelink']."-".$res['text']; return $res; } -----end DbConnector.php----- -----Output----- Query Statement: SELECT id, title FROM articles ORDER BY id DESC LIMIT 0,5 vardump1:bool(true) PHP Error Message Warning: mysql_num_rows(): supplied argument is not a valid MySQL result resource in /path to/index.php on line 17 Number of rows in the result of the query: <|bool(true) | PHP Error Message Warning: mysql_fetch_array(): supplied argument is not a valid MySQL result resource in /path to/DbConnector.php on line 50

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  • Windows Game Loop 50% CPU on Dual Core

    - by Dave18
    The game loop alone is using 50% of CPU Usage, I haven't done any rendering work yet. What i'm doing here? while(true) { if(PeekMessage(&msg,NULL,0,0,PM_REMOVE)) { if(msg.message == WM_QUIT || msg.message == WM_CLOSE || msg.message == WM_DESTROY) break; TranslateMessage(&msg); DispatchMessage(&msg); } else { //Run game code, break out of loop when the game is over } }

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  • Performance analysis for java application

    - by user1827614
    I want to do a performance measurement of my application and would like to be able to configure the stats for specific module like (enable for specific module and disable for some) and I want to measure things like memory usage, threads, average band width etc.. Can any one suggest something please, I am new to this. I think Visual VM is good but it doesnot support configuring for different modules. Does Perf4j or Admin4j work here? any one has used these before?

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  • How to achieve a specific fraction(say 80%) of the cpus and balanced over them

    - by swellfr
    Hi, I was wondering if it would be possible to run app not at 100% of the cpu but at a specific amount of the cpus. I see different usage of this , we can better balance concurrent application ( we may want to have balance app 50% to have fair apps/agent/... ) i was also wondering if the power consumption would not be better if the cpus doesnt run at full throttle but at some lower level( say 80% ) What are your thoughts Thx examples are welcomed :)

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  • postfix with mailman

    - by Thufir
    What should happen is that [email protected] should be delivered to that users inbox on localhost, user@localhost. Thunderbird works fine at reading user@localhost. I'm just using a small portion of postfix-dovecot with Ubuntu mailman. How can I get postfix to recognize the FQDN and deliver them to a localhost inbox? root@dur:~# root@dur:~# tail /var/log/mail.err;tail /var/log/mailman/subscribe;postconf -n Aug 27 18:59:16 dur dovecot: lda(root): Error: chdir(/root) failed: Permission denied Aug 27 18:59:16 dur dovecot: lda(root): Error: user root: Initialization failed: Initializing mail storage from mail_location setting failed: stat(/root/Maildir) failed: Permission denied (euid=65534(nobody) egid=65534(nogroup) missing +x perm: /root, dir owned by 0:0 mode=0700) Aug 27 18:59:16 dur dovecot: lda(root): Fatal: Invalid user settings. Refer to server log for more information. Aug 27 20:09:16 dur postfix/trivial-rewrite[15896]: error: open database /etc/postfix/transport.db: No such file or directory Aug 27 21:19:17 dur postfix/trivial-rewrite[16569]: error: open database /etc/postfix/transport.db: No such file or directory Aug 27 22:27:00 dur postfix[17042]: fatal: usage: postfix [-c config_dir] [-Dv] command Aug 27 22:29:19 dur postfix/trivial-rewrite[17062]: error: open database /etc/postfix/transport.db: No such file or directory Aug 27 22:59:07 dur postfix/postfix-script[17459]: error: unknown command: 'restart' Aug 27 22:59:07 dur postfix/postfix-script[17460]: fatal: usage: postfix start (or stop, reload, abort, flush, check, status, set-permissions, upgrade-configuration) Aug 27 23:39:17 dur postfix/trivial-rewrite[17794]: error: open database /etc/postfix/transport.db: No such file or directory Aug 27 21:39:03 2012 (16734) cola: pending "[email protected]" <[email protected]> 127.0.0.1 Aug 27 21:40:37 2012 (16749) cola: pending "[email protected]" <[email protected]> 127.0.0.1 Aug 27 22:45:31 2012 (17288) gmane.mail.mailman.user.1: pending [email protected] 127.0.0.1 Aug 27 22:45:46 2012 (17293) gmane.mail.mailman.user.1: pending [email protected] 127.0.0.1 Aug 27 23:02:01 2012 (17588) test3: pending [email protected] 127.0.0.1 Aug 27 23:05:41 2012 (17652) test4: pending [email protected] 127.0.0.1 Aug 27 23:56:20 2012 (17985) test5: pending [email protected] 127.0.0.1 alias_database = hash:/etc/aliases alias_maps = hash:/etc/aliases, hash:/var/lib/mailman/data/aliases append_dot_mydomain = no biff = no broken_sasl_auth_clients = yes config_directory = /etc/postfix default_transport = smtp home_mailbox = Maildir/ inet_interfaces = loopback-only mailbox_command = /usr/lib/dovecot/deliver -c /etc/dovecot/conf.d/01-mail-stack-delivery.conf -m "${EXTENSION}" mailbox_size_limit = 0 mailman_destination_recipient_limit = 1 mydestination = dur, dur.bounceme.net, localhost.bounceme.net, localhost myhostname = dur.bounceme.net mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 readme_directory = no recipient_delimiter = + relay_domains = lists.dur.bounceme.net relay_transport = relay relayhost = smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache smtp_use_tls = yes smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu) smtpd_recipient_restrictions = reject_unknown_sender_domain, reject_unknown_recipient_domain, reject_unauth_pipelining, permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination smtpd_sasl_auth_enable = yes smtpd_sasl_authenticated_header = yes smtpd_sasl_local_domain = $myhostname smtpd_sasl_path = private/dovecot-auth smtpd_sasl_security_options = noanonymous smtpd_sasl_type = dovecot smtpd_tls_auth_only = yes smtpd_tls_cert_file = /etc/ssl/certs/ssl-mail.pem smtpd_tls_key_file = /etc/ssl/private/ssl-mail.key smtpd_tls_mandatory_ciphers = medium smtpd_tls_mandatory_protocols = SSLv3, TLSv1 smtpd_tls_received_header = yes smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache smtpd_use_tls = yes tls_random_source = dev:/dev/urandom transport_maps = hash:/etc/postfix/transport root@dur:~# there's definitely a transport problem: root@dur:~# root@dur:~# root@dur:~# grep transport /var/log/mail.log | tail Aug 27 22:29:19 dur postfix/trivial-rewrite[17062]: warning: hash:/etc/postfix/transport lookup error for "[email protected]" Aug 27 22:29:19 dur postfix/trivial-rewrite[17062]: warning: transport_maps lookup failure Aug 27 23:39:17 dur postfix/trivial-rewrite[17794]: error: open database /etc/postfix/transport.db: No such file or directory Aug 27 23:39:17 dur postfix/trivial-rewrite[17794]: warning: hash:/etc/postfix/transport is unavailable. open database /etc/postfix/transport.db: No such file or directory Aug 27 23:39:17 dur postfix/trivial-rewrite[17794]: warning: hash:/etc/postfix/transport lookup error for "*" Aug 27 23:39:17 dur postfix/trivial-rewrite[17794]: warning: hash:/etc/postfix/transport is unavailable. open database /etc/postfix/transport.db: No such file or directory Aug 27 23:39:17 dur postfix/trivial-rewrite[17794]: warning: hash:/etc/postfix/transport lookup error for "*" Aug 27 23:39:17 dur postfix/trivial-rewrite[17794]: warning: hash:/etc/postfix/transport is unavailable. open database /etc/postfix/transport.db: No such file or directory Aug 27 23:39:17 dur postfix/trivial-rewrite[17794]: warning: hash:/etc/postfix/transport lookup error for "[email protected]" Aug 27 23:39:17 dur postfix/trivial-rewrite[17794]: warning: transport_maps lookup failure root@dur:~# trying to add the transport file: EDIT root@dur:~# root@dur:~# touch /etc/postfix/transport root@dur:~# ll /etc/postfix/transport -rw-r--r-- 1 root root 0 Aug 28 00:16 /etc/postfix/transport root@dur:~# root@dur:~# cd /etc/postfix/ root@dur:/etc/postfix# root@dur:/etc/postfix# postmap transport root@dur:/etc/postfix# root@dur:/etc/postfix# cat transport

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  • Is there really a need for encryption to have true wireless security? [closed]

    - by Cawas
    I welcome better key-wording here, both on tags and title. I'm trying to conceive a free, open and secure network environment that would work anywhere, from big enterprises to small home networks of just 1 machine. I think since wireless Access Points are the most, if not only, true weak point of a Local Area Network (let's not consider every other security aspect of having internet) there would be basically two points to consider here: Having an open AP for anyone to use the internet through Leaving the whole LAN also open for guests to be able to easily read (only) files on it, and even a place to drop files on Considering these two aspects, once everything is done properly... What's the most secure option between having that, or having just an encrypted password-protected wifi? Of course "both" would seem "more secure". But it shouldn't actually be anything substantial. That's the question, but I think it may need more elaborating on. If you don't think so, please feel free to skip the next (long) part. Elaborating more on the two aspects ... I've always had the feeling using any kind of the so called "wireless security" methods is actually a bad design. I'm talking mostly about encrypting and pass-phrasing (which are actually two different concepts), since I won't even consider hiding SSID and mac filtering. I understand it's a natural way of thinking. With cable networking nobody can access the network unless they have access to the physical cable, so you're "secure" in the physical way. In a way, encrypting is for wireless what building walls is for the cables. And giving pass-phrases would be adding a door with a key. But the cabling without encryption is also insecure. If someone plugin all the data is right there. So, while I can see the use for encrypting data, I don't think it's a security measure in wireless networks. It's wasting resources for too little gain. I believe we should encrypt only sensitive data regardless of wires. That's already done with HTTPS, so I don't really need to encrypt my torrents, for instance. They're torrents, they are meant to be freely shared! As for using passwords, they should be added to the users, always. Not to wifi. For securing files, truly, best solution is backup. Sure all that doesn't happen that often, but I won't consider the most situations where people just don't care. I think there are enough situations where we actually use passwords on our OS users, so let's go with that in mind. I keep promoting the Fonera concept as an instance. It opens up a free wifi port, if you choose so, and anyone can connect to the internet through that, without having any access to your LAN. It also uses a QoS which will never let your bandwidth drop from that public usage. That's security, and it's open. But it's lacking the second aspect. I'll probably be bashed for promoting the non-usage of WPA 2 with AES or whatever, but I wanted to know from more experienced (super) users out there: what do you think?

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  • Squid w/ SquidGuard fails w/ "Too few redirector processes are running"

    - by DKNUCKLES
    I'm trying to implement a Squid proxy in a quick and easy fashion and I'm receiving some errors I have been unable to resolve. The box is a pre-made appliance, however it seems to fail on launch.The following is the cache.log file when I attempt to launch the squid service. 2012/11/18 22:14:29| Starting Squid Cache version 3.0.STABLE20-20091201 for i686 -pc-linux-gnu... 2012/11/18 22:14:29| Process ID 12647 2012/11/18 22:14:29| With 1024 file descriptors available 2012/11/18 22:14:29| Performing DNS Tests... 2012/11/18 22:14:29| Successful DNS name lookup tests... 2012/11/18 22:14:29| DNS Socket created at 0.0.0.0, port 40513, FD 8 2012/11/18 22:14:29| Adding nameserver 192.168.0.78 from /etc/resolv.conf 2012/11/18 22:14:29| Adding nameserver 8.8.8.8 from /etc/resolv.conf 2012/11/18 22:14:29| helperOpenServers: Starting 5/5 'bin' processes 2012/11/18 22:14:29| ipcCreate: /opt/squidguard/bin: (13) Permission denied 2012/11/18 22:14:29| ipcCreate: /opt/squidguard/bin: (13) Permission denied 2012/11/18 22:14:29| ipcCreate: /opt/squidguard/bin: (13) Permission denied 2012/11/18 22:14:29| ipcCreate: /opt/squidguard/bin: (13) Permission denied 2012/11/18 22:14:29| ipcCreate: /opt/squidguard/bin: (13) Permission denied 2012/11/18 22:14:29| helperOpenServers: Starting 5/5 'squid-auth.pl' processes 2012/11/18 22:14:29| User-Agent logging is disabled. 2012/11/18 22:14:29| Referer logging is disabled. 2012/11/18 22:14:29| Unlinkd pipe opened on FD 23 2012/11/18 22:14:29| Swap maxSize 10240000 + 8192 KB, estimated 788322 objects 2012/11/18 22:14:29| Target number of buckets: 39416 2012/11/18 22:14:29| Using 65536 Store buckets 2012/11/18 22:14:29| Max Mem size: 8192 KB 2012/11/18 22:14:29| Max Swap size: 10240000 KB 2012/11/18 22:14:29| Version 1 of swap file with LFS support detected... 2012/11/18 22:14:29| Rebuilding storage in /opt/squid3/var/cache (DIRTY) 2012/11/18 22:14:29| Using Least Load store dir selection 2012/11/18 22:14:29| Set Current Directory to /opt/squid3/var/cache 2012/11/18 22:14:29| Loaded Icons. 2012/11/18 22:14:29| Accepting HTTP connections at 10.0.0.6, port 3128, FD 25. 2012/11/18 22:14:29| Accepting ICP messages at 0.0.0.0, port 3130, FD 26. 2012/11/18 22:14:29| HTCP Disabled. 2012/11/18 22:14:29| Ready to serve requests. 2012/11/18 22:14:29| Done reading /opt/squid3/var/cache swaplog (0 entries) 2012/11/18 22:14:29| Finished rebuilding storage from disk. 2012/11/18 22:14:29| 0 Entries scanned 2012/11/18 22:14:29| 0 Invalid entries. 2012/11/18 22:14:29| 0 With invalid flags. 2012/11/18 22:14:29| 0 Objects loaded. 2012/11/18 22:14:29| 0 Objects expired. 2012/11/18 22:14:29| 0 Objects cancelled. 2012/11/18 22:14:29| 0 Duplicate URLs purged. 2012/11/18 22:14:29| 0 Swapfile clashes avoided. 2012/11/18 22:14:29| Took 0.02 seconds ( 0.00 objects/sec). 2012/11/18 22:14:29| Beginning Validation Procedure 2012/11/18 22:14:29| WARNING: redirector #1 (FD 9) exited 2012/11/18 22:14:29| WARNING: redirector #2 (FD 10) exited 2012/11/18 22:14:29| WARNING: redirector #3 (FD 11) exited 2012/11/18 22:14:29| WARNING: redirector #4 (FD 12) exited 2012/11/18 22:14:29| Too few redirector processes are running FATAL: The redirector helpers are crashing too rapidly, need help! Squid Cache (Version 3.0.STABLE20-20091201): Terminated abnormally. CPU Usage: 0.112 seconds = 0.032 user + 0.080 sys Maximum Resident Size: 0 KB Page faults with physical i/o: 0 Memory usage for squid via mallinfo(): total space in arena: 2944 KB Ordinary blocks: 2857 KB 6 blks Small blocks: 0 KB 0 blks Holding blocks: 1772 KB 8 blks Free Small blocks: 0 KB Free Ordinary blocks: 86 KB Total in use: 4629 KB 157% Total free: 86 KB 3% The "permission denied" area is where I have been focusing my attention with no luck. The following is what I've tried. Chmod'ing the /opt/squidguard/bin folder to 777 Changing the user that squidguard runs under to root / nobody / www-data / squid3 Tried changing ownership of the /opt/squidguard/bin folder to all names listed above after assigning that user to run with squid. Any help with this would be greatly appreciated.

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