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• jqtouch / google maps api v3 issue

  - by Rigo Vides

  Hi everyone, I'm having a hard time triying to make jQtouch and Google Maps api V3 together. I've tried almost everything. It seems that the only source of information is here I checked every single post. I'm starting with jQuery and css... so there's a lot of stuff I don't understand. First of all, I'm using jQtouch framework to build a web app with google maps integration, the problem is that whenever I pan the map, strange flickering occurs. It's like jQtouch and the map are trying to fight for a callback. I'm using the latest revision out there. And have several bugs, regarding transition/animation functionality (since I don't wrap the map and all the element's divs within the #jqt wrapper) and css issues with some styling. Anyone has successfully achieve a functional setup build for this scenario? (google maps api v3 & jqtouch), I think is not necessary to paste you some code (But if you think is necessary please let me know and I'll do it), If you paste me a minimal example with a map (detailing jqtouch version, and modification to the styles/.js files), and some transition back and forth from the map to another div/section/page, you'll get the bounty. Thanks a lot in advance. And please, let me know if this is kind of 'legal' here, I mean, there's too loose information on the official wiki, and like 13 'solutions' but nothing concrete... I'm just triying to help anyone who step on in this problem in the future.

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• Getting the submatrix with maximum sum?

  - by guirgis

  With the help of the Algorithmist and Larry and a modification of Kadane's Algorithm, here is my solution: int dim = matrix.length; //computing the vertical prefix sum for columns int[][] ps = new int[dim][dim]; for (int i = 0; i < dim; i++) { for (int j = 0; j < dim; j++) { if (j == 0) { ps[j][i] = matrix[j][i]; } else { ps[j][i] = matrix[j][i] + ps[j - 1][i]; } } } int maxSoFar = 0; int min , subMatrix; //iterate over the possible combinations applying Kadane's Alg. //int toplefti =0, topleftj=0, bottomrighti=0, bottomrightj=0; for (int i = 0; i < dim; i++) { for (int j = i; j < dim; j++) { min = 0; subMatrix = 0; for (int k = 0; k < dim; k++) { if (i == 0) { subMatrix += ps[j][k]; } else { subMatrix += ps[j][k] - ps[i-1][k]; } if(subMatrix < min){ min = subMatrix; } if((subMatrix - min) > maxSoFar){ maxSoFar = subMatrix - min; } } } } The only problem left is to determine the submatrix elements, i mean the top left and the bottom right corners. I managed to do this in one dimensional case. Any suggestions?

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• Incorporating the Windows 7 onscreen keyboard into a WPF app

  - by mmr

  Windows 7 has a really nice onscreen keyboard program/control for touchscreens. I have a touchscreen app that was originally written for, and will be deployed on, XP. Is it possible to incorporate this keyboard directly into my app, rather than me using a custom control? I can find no programmatic information about it, so any links would be very helpful. Specifically, I'd need: To be able to use the keyboard on an XP machine that will have .NET 3.5 sp1 installed on it. To be able to hide the native keyboard on Windows 7, because I've already incorporated the touchscreen keyboard in my UI and so I don't need another one cluttering up the UI. This native keyboard has two attractive aspects to it. First off, it's automatically localized to the customer's language (though the rest of the app will need modification), and second off, it doesn't seem to suffer from 'touch lag' as the OS tries to figure out whether or not I'm doing a gesture, because I'm clearly typing on a keyboard. The app is WPF based, which should mean easy integration with Windows 7 based controls. EDIT: I'd really like the XP thing, but it's not a requirement. The ability to use the keyboard in Win7, though, seems like it should be possible and even the right way to do it.

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• How to use walker to replace core function

  - by bellesebastien

  I want to modify the way pages are listed in the navigation, particularly the function el_start from wp-includes/classes.php. I've first modified the classes.php directly and it worked fine butnow I want to revert classes.php and move the modification out of wordpress' internal files. I wrote a walker class that I want to use but I don't know how to use it. I want to replace the current call wp_list_pages() to this: $walker_pages = new Walker_Page_CustomTitle; wp_list_pages(array('walker' => $walker_pages, 'title_li' => '', 'depth' => '1')); I've tried using a filter like so: function wp_list_pages_custom() { $walker_pages = new Walker_Page_CustomTitle; wp_list_pages(array('walker' => $walker_pages, 'title_li' => '', 'depth' => '1')); } add_filter('widget_area_primary_aside', 'wp_list_pages_custom'); But with this filter, the site won't load anymore. The tutorial here says I should put this code in header.php but that just puts my page links in the tag. I hope I'm making sense. Thanks.

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• C# sendkeys problem

  - by user203123

  THe code below I copied from MSDN with a bit of modification: [DllImport("user32.dll", CharSet = CharSet.Unicode)] public static extern IntPtr FindWindow(string lpClassName,string lpWindowName); DllImport("User32")] public static extern bool SetForegroundWindow(IntPtr hWnd); int cnt = 0; private void button1_Click(object sender, EventArgs e) { IntPtr calculatorHandle = FindWindow("Notepad", "Untitled - Notepad"); if (calculatorHandle == IntPtr.Zero) { MessageBox.Show("Calculator is not running."); return; } SetForegroundWindow(calculatorHandle); SendKeys.SendWait(cnt.ToString()); SendKeys.SendWait("{ENTER}"); cnt++; SendKeys.Flush(); System.Threading.Thread.Sleep(1000); } The problem is the number sequence in Notepad is not continuously. The first click always results 0 (as expected). but from the second click, the result is unpredictable (but the sequence is still in order, e.g. 3, 4, 5, 10, 14, 15, ....) If I click the button fast enough, I was able to get the result in continuous order (0,1,2,3,4,....) but sometimes it produces more than 2 same numbers (e.g. 0,1,2,3,3,3,4,5,6,6,6,7,8,9,...) Couldn't understand. Plz enlighten me :) Thanks.

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• Modify code to change timestamp timezone in sitemap

  - by Aahan Krish

  Below is the code from a plugin I use for sitemaps. I would like to know if there's a way to "enforce" a different timezone on all date variable and functions in it. If not, how do I modify the code to change the timestamp to reflect a different timezone? Say for example, to America/New_York timezone. Please look for date to quickly get to the appropriate code blocks. Code on Pastebin. <?php /** * @package XML_Sitemaps */ class WPSEO_Sitemaps { ..... /** * Build the root sitemap -- example.com/sitemap_index.xml -- which lists sub-sitemaps * for other content types. * * @todo lastmod for sitemaps? */ function build_root_map() { global $wpdb; $options = get_wpseo_options(); $this->sitemap = '<sitemapindex xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">' . "\n"; $base = $GLOBALS['wp_rewrite']->using_index_permalinks() ? 'index.php/' : ''; // reference post type specific sitemaps foreach ( get_post_types( array( 'public' => true ) ) as $post_type ) { if ( $post_type == 'attachment' ) continue; if ( isset( $options['post_types-' . $post_type . '-not_in_sitemap'] ) && $options['post_types-' . $post_type . '-not_in_sitemap'] ) continue; $count = $wpdb->get_var( $wpdb->prepare( "SELECT COUNT(ID) FROM $wpdb->posts WHERE post_type = %s AND post_status = 'publish' LIMIT 1", $post_type ) ); // don't include post types with no posts if ( !$count ) continue; $n = ( $count > 1000 ) ? (int) ceil( $count / 1000 ) : 1; for ( $i = 0; $i < $n; $i++ ) { $count = ( $n > 1 ) ? $i + 1 : ''; if ( empty( $count ) || $count == $n ) { $date = $this->get_last_modified( $post_type ); } else { $date = $wpdb->get_var( $wpdb->prepare( "SELECT post_modified_gmt FROM $wpdb->posts WHERE post_status = 'publish' AND post_type = %s ORDER BY post_modified_gmt ASC LIMIT 1 OFFSET %d", $post_type, $i * 1000 + 999 ) ); $date = date( 'c', strtotime( $date ) ); } $this->sitemap .= '<sitemap>' . "\n"; $this->sitemap .= '<loc>' . home_url( $base . $post_type . '-sitemap' . $count . '.xml' ) . '</loc>' . "\n"; $this->sitemap .= '<lastmod>' . htmlspecialchars( $date ) . '</lastmod>' . "\n"; $this->sitemap .= '</sitemap>' . "\n"; } } // reference taxonomy specific sitemaps foreach ( get_taxonomies( array( 'public' => true ) ) as $tax ) { if ( in_array( $tax, array( 'link_category', 'nav_menu', 'post_format' ) ) ) continue; if ( isset( $options['taxonomies-' . $tax . '-not_in_sitemap'] ) && $options['taxonomies-' . $tax . '-not_in_sitemap'] ) continue; // don't include taxonomies with no terms if ( !$wpdb->get_var( $wpdb->prepare( "SELECT term_id FROM $wpdb->term_taxonomy WHERE taxonomy = %s AND count != 0 LIMIT 1", $tax ) ) ) continue; // Retrieve the post_types that are registered to this taxonomy and then retrieve last modified date for all of those combined. $taxobj = get_taxonomy( $tax ); $date = $this->get_last_modified( $taxobj->object_type ); $this->sitemap .= '<sitemap>' . "\n"; $this->sitemap .= '<loc>' . home_url( $base . $tax . '-sitemap.xml' ) . '</loc>' . "\n"; $this->sitemap .= '<lastmod>' . htmlspecialchars( $date ) . '</lastmod>' . "\n"; $this->sitemap .= '</sitemap>' . "\n"; } // allow other plugins to add their sitemaps to the index $this->sitemap .= apply_filters( 'wpseo_sitemap_index', '' ); $this->sitemap .= '</sitemapindex>'; } /** * Build a sub-sitemap for a specific post type -- example.com/post_type-sitemap.xml * * @param string $post_type Registered post type's slug */ function build_post_type_map( $post_type ) { $options = get_wpseo_options(); ............ // We grab post_date, post_name, post_author and post_status too so we can throw these objects into get_permalink, which saves a get_post call for each permalink. while ( $total > $offset ) { $join_filter = apply_filters( 'wpseo_posts_join', '', $post_type ); $where_filter = apply_filters( 'wpseo_posts_where', '', $post_type ); // Optimized query per this thread: http://wordpress.org/support/topic/plugin-wordpress-seo-by-yoast-performance-suggestion // Also see http://explainextended.com/2009/10/23/mysql-order-by-limit-performance-late-row-lookups/ $posts = $wpdb->get_results( "SELECT l.ID, post_content, post_name, post_author, post_parent, post_modified_gmt, post_date, post_date_gmt FROM ( SELECT ID FROM $wpdb->posts {$join_filter} WHERE post_status = 'publish' AND post_password = '' AND post_type = '$post_type' {$where_filter} ORDER BY post_modified ASC LIMIT $steps OFFSET $offset ) o JOIN $wpdb->posts l ON l.ID = o.ID ORDER BY l.ID" ); /* $posts = $wpdb->get_results("SELECT ID, post_content, post_name, post_author, post_parent, post_modified_gmt, post_date, post_date_gmt FROM $wpdb->posts {$join_filter} WHERE post_status = 'publish' AND post_password = '' AND post_type = '$post_type' {$where_filter} ORDER BY post_modified ASC LIMIT $steps OFFSET $offset"); */ $offset = $offset + $steps; foreach ( $posts as $p ) { $p->post_type = $post_type; $p->post_status = 'publish'; $p->filter = 'sample'; if ( wpseo_get_value( 'meta-robots-noindex', $p->ID ) && wpseo_get_value( 'sitemap-include', $p->ID ) != 'always' ) continue; if ( wpseo_get_value( 'sitemap-include', $p->ID ) == 'never' ) continue; if ( wpseo_get_value( 'redirect', $p->ID ) && strlen( wpseo_get_value( 'redirect', $p->ID ) ) > 0 ) continue; $url = array(); $url['mod'] = ( isset( $p->post_modified_gmt ) && $p->post_modified_gmt != '0000-00-00 00:00:00' ) ? $p->post_modified_gmt : $p->post_date_gmt; $url['chf'] = 'weekly'; $url['loc'] = get_permalink( $p ); ............. } /** * Build a sub-sitemap for a specific taxonomy -- example.com/tax-sitemap.xml * * @param string $taxonomy Registered taxonomy's slug */ function build_tax_map( $taxonomy ) { $options = get_wpseo_options(); .......... // Grab last modified date $sql = "SELECT MAX(p.post_date) AS lastmod FROM $wpdb->posts AS p INNER JOIN $wpdb->term_relationships AS term_rel ON term_rel.object_id = p.ID INNER JOIN $wpdb->term_taxonomy AS term_tax ON term_tax.term_taxonomy_id = term_rel.term_taxonomy_id AND term_tax.taxonomy = '$c->taxonomy' AND term_tax.term_id = $c->term_id WHERE p.post_status = 'publish' AND p.post_password = ''"; $url['mod'] = $wpdb->get_var( $sql ); $url['chf'] = 'weekly'; $output .= $this->sitemap_url( $url ); } } /** * Build the <url> tag for a given URL. * * @param array $url Array of parts that make up this entry * @return string */ function sitemap_url( $url ) { if ( isset( $url['mod'] ) ) $date = mysql2date( "Y-m-d\TH:i:s+00:00", $url['mod'] ); else $date = date( 'c' ); $output = "\t<url>\n"; $output .= "\t\t<loc>" . $url['loc'] . "</loc>\n"; $output .= "\t\t<lastmod>" . $date . "</lastmod>\n"; $output .= "\t\t<changefreq>" . $url['chf'] . "</changefreq>\n"; $output .= "\t\t<priority>" . str_replace( ',', '.', $url['pri'] ) . "</priority>\n"; if ( isset( $url['images'] ) && count( $url['images'] ) > 0 ) { foreach ( $url['images'] as $img ) { $output .= "\t\t<image:image>\n"; $output .= "\t\t\t<image:loc>" . esc_html( $img['src'] ) . "</image:loc>\n"; if ( isset( $img['title'] ) ) $output .= "\t\t\t<image:title>" . _wp_specialchars( html_entity_decode( $img['title'], ENT_QUOTES, get_bloginfo('charset') ) ) . "</image:title>\n"; if ( isset( $img['alt'] ) ) $output .= "\t\t\t<image:caption>" . _wp_specialchars( html_entity_decode( $img['alt'], ENT_QUOTES, get_bloginfo('charset') ) ) . "</image:caption>\n"; $output .= "\t\t</image:image>\n"; } } $output .= "\t</url>\n"; return $output; } /** * Get the modification date for the last modified post in the post type: * * @param array $post_types Post types to get the last modification date for * @return string */ function get_last_modified( $post_types ) { global $wpdb; if ( !is_array( $post_types ) ) $post_types = array( $post_types ); $result = 0; foreach ( $post_types as $post_type ) { $key = 'lastpostmodified:gmt:' . $post_type; $date = wp_cache_get( $key, 'timeinfo' ); if ( !$date ) { $date = $wpdb->get_var( $wpdb->prepare( "SELECT post_modified_gmt FROM $wpdb->posts WHERE post_status = 'publish' AND post_type = %s ORDER BY post_modified_gmt DESC LIMIT 1", $post_type ) ); if ( $date ) wp_cache_set( $key, $date, 'timeinfo' ); } if ( strtotime( $date ) > $result ) $result = strtotime( $date ); } // Transform to W3C Date format. $result = date( 'c', $result ); return $result; } } global $wpseo_sitemaps; $wpseo_sitemaps = new WPSEO_Sitemaps();

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• ifconfig networking telnet

  - by jhon

  Hi guys, I'm newbie around networking, I have a question: what I want is to telnet a specific IP/server, let us say 192.168.128.1 then, I try $telnet 192.168.128.1 Trying... and that's all.. I never get connected one of my friends made some script that "fixes" it, AFTER running it I was able to connect to the server using $telnet 192.168.128.1 $ user: unfortunately I lost that script, so I'm here requesting your help. Reading my old notes, I remember that the script performed some modification to the entries listed by ifconfig -a, I also have the ifconfig's output (copy & paste) $ ifconfig -a adapter0: flags=5e080863,c0<UP,BROADCAST,NOTRAILERS,RUNNING,SIMPLEX,MULTICAST,GROUPRT,64BIT,CHECKSUM_OFFLOAD(ACTIVE),PSEG,LARGESEND,CHAIN> inet 192.168.128.150 netmask 0xffffff00 broadcast 192.168.128.255 tcp_sendspace 131072 tcp_recvspace 65536 rfc1323 0 adapter1: flags=5e080863,c0<UP,BROADCAST,NOTRAILERS,RUNNING,SIMPLEX,MULTICAST,GROUPRT,64BIT,CHECKSUM_OFFLOAD(ACTIVE),PSEG,LARGESEND,CHAIN> inet 192.168.251.150 netmask 0xffffff00 broadcast 192.168.251.255 tcp_sendspace 131072 tcp_recvspace 65536 rfc1323 0 adapter2: flags=5e080863,c0<UP,BROADCAST,NOTRAILERS,RUNNING,SIMPLEX,MULTICAST,GROUPRT,64BIT,CHECKSUM_OFFLOAD(ACTIVE),PSEG,LARGESEND,CHAIN> inet 192.168.250.150 netmask 0xffffff00 broadcast 192.168.250.255 tcp_sendspace 131072 tcp_recvspace 65536 rfc1323 0 lo0: flags=e08084b<UP,BROADCAST,LOOPBACK,RUNNING,SIMPLEX,MULTICAST,GROUPRT,64BIT> inet 127.0.0.1 netmask 0xff000000 broadcast 127.255.255.255 inet6 ::1/0 tcp_sendspace 131072 tcp_recvspace 131072 rfc1323 1 more than commands, I'm looking for some explanation why does "adding/changing" those entries enables me to connect to the server. I do not see the server ip (i.e 192.168.128.1) listed above. thanks

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• Can I make a "TCP packet modifier" using tun/tap and raw sockets?

  - by benhoyt

  I have a Linux application that talks TCP, and to help with analysis and statistics, I'd like to modify the data in some of the TCP packets that it sends out. I'd prefer to do this without hacking the Linux TCP stack. The idea I have so far is to make a bridge which acts as a "TCP packet modifier". My idea is to connect to the application via a tun/tap device on one side of the bridge, and to the network card via raw sockets on the other side of the bridge. My concern is that when you open a raw socket it still sends packets up to Linux's TCP stack, and so I couldn't modify them and send them on even if I wanted to. Is this correct? A pseudo-C-code sketch of the bridge looks like: tap_fd = open_tap_device("/dev/net/tun"); raw_fd = open_raw_socket(); for (;;) { select(fds = [tap_fd, raw_fd]); if (FD_ISSET(tap_fd, &fds)) { read_packet(tap_fd); modify_packet_if_needed(); write_packet(raw_fd); } if (FD_ISSET(raw_fd, &fds)) { read_packet(raw_fd); modify_packet_if_needed(); write_packet(tap_fd); } } Does this look possible, or are there other better ways of achieving the same thing? (TCP packet bridging and modification.)

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• restart of web dev server every time load ASP.NET MVC application

  - by kjm

  Hi, I continously get this problem (stack trace below) when I start my ASP.NET MVC application and have to restart the web dev server and then it goes away. It appears to be happening on when I make modification in my jquery and then try to restart the application. protected void Application_Start() { InitialiseIocContainer(); RegisterViewEngine(ViewEngines.Engines); RegisterRoutes(RouteTable.Routes); SetupLogging(); } It appears to get caugth on the Application_start in global.asax. I've done lots of search in google but no luck. ITS DRIVING ME BONKERS!!!! can anyone help please Server Error in '/' Application. -------------------------------------------------------------------------------- Loading this assembly would produce a different grant set from other instances. (Exception from HRESULT: 0x80131401) Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.IO.FileLoadException: Loading this assembly would produce a different grant set from other instances. (Exception from HRESULT: 0x80131401) Source Error: Line 30: RegisterRoutes(RouteTable.Routes); Line 31: SetupLogging(); Line 32: } Line 33: Line 34: private void SetupLogging() Source File: C:\UserData\SourceControl\LLNP4\Trunk\Web\Global.asax.cs Line: 32 Stack Trace: [FileLoadException: Loading this assembly would produce a different grant set from other instances. (Exception from HRESULT: 0x80131401)] LLNP4.MvcApplication.Application_Start() in C:\UserData\SourceControl\LLNP4\Trunk\Web\Global.asax.cs:32

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• Implementing Struts 2 Interceptors using Struts 1

  - by Andriy Zakharchuk

  Hello all, I have a legacy application written with Struts 1. The only feature I was asked to add is to protect some actions. Currently any user can do whatever he/she wants. The idea is to allows all user see the data, but block modification operation, i.e. to modify data a user should log in. I know Struts2 has interceptors, so I could attach them to required actions and forward users to log in page when needed. But how can I do similar thing in Struts 1 application? My first idea was to create my own abstract Action class: public class AuthenticatedAction { public ActionForward execute( ActionMapping mapping, ActionForm form, HttpServletRequest theRequest, HttpServletResponse theResponse) { if (!logged) { // forward to log in form } else { doExecute(mapping, form, request, response); } } public abstract ActionForward doExecute( ActionMapping mapping, ActionForm form, HttpServletRequest theRequest, HttpServletResponse theResponse); } Then change all actions that require authentication from extends Action to extends AuthenticatedAction then add login form, login action (which performs authentications and puts this status into the session) and change JSP header tile to display authentication block, e.g., "You are (not logged in)/", Login/Logout. As I guess this should solve the problem. If this doesn't solve the problem, please explain me why. Is there any better (more elegant like interceptors are) way to do this? Thank you in advance.

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• ajax delay load UserControl asp.net

  - by user196202

  regarding ajax delay load of usercontrols (or any controls) on Post at Encosia.com : http://encosia.com/2008/02/05/boost-aspnet-performance-with-deferred-content-loading/ I tried to implement it , but I noticed that it can be done only for simple controls or UserControls that Have simple asp.net controls (or html tags) . But when it involved with advanced dynamic ajax control (like ajaxControlToolkit or Telerik controls) that have javascripts inside them This method of injecting the html code to the .InnerHtml property of div tag (for example) IS NOT WORKING , and I red about it that The browser need to load the script on load and after that it won't iterperate the scripts injectd via .InnerHtml. So I attached here example of delay load project (from encosia.com by dave ward) with my modification (look at DefaultPopup.aspx and beforePopup.aspx and AfterPopup.aspx) Which I modified the RssReader to show listview with popup items (which is implemented via ACT HoverMenuExtender ) So in the regular way the popup items are shown right , but on the delay load which is done by creating virtual page for rendering the html and injecting it to .InnerHtml property – This ISN'T WORKING. So my question is : is there a way to do delay loading for controls which include scripts lik ACT and Telerik and others? And for the ajax templates – if I need to inject advanced control to the page – how I do it with your approach? Thanks very much (I can't attach here files so everyone please ask me by mail ([email protected]) and i'll send it to him. ) Zahi Kramer

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• how to do introspection in R (stat package)

  - by Lebron James

  Hi all, I am somewhat new to R, and i have this piece of code which generates a variable that i don't know the type for. Are there any introspection facility in R which will tell me which type this variable belongs to? The following illustrates the property of this variable: I am working on linear model selection, and the resource I have is lm result from another model. Now I want to retrieve the lm call by the command summary(model)$call so that I don't need to hardcode the model structure. However, since I have to change the dataset, I need to do a bit of modification on the "string", but apparently it is not a simple string. I wonder if there is any command similar to string.replace so that I can manipulate this variable from the variable $call. Thanks > str<-summary(rdnM)$call > str lm(formula = y ~ x1, data = rdndat) > str[1] lm() > str[2] y ~ x1() > str[3] rdndat() > str[3] <- data Warning message: In str[3] <- data : number of items to replace is not a multiple of replacement length > str lm(formula = y ~ x1, data = c(10, 20, 30, 40)) > str<-summary(rdnM)$call > str lm(formula = y ~ x1, data = rdndat) > str[3] <- 'data' > str lm(formula = y ~ x1, data = "data") > str<-summary(rdnM)$call > type str Error: unexpected symbol in "type str" >

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• Pros & Cons of Google App Engine

  - by Rishi

  Pros & Cons of Google App Engine [An Updated List 21st Aug 09] Help me Compile a List of all the Advantages & Disadvantages of Building an Application on the Google App Engine Pros: 1) No Need to buy Servers or Server Space (no maintenance). 2) Makes solving the problem of scaling much easier. Cons: 1) Locked into Google App Engine ?? 2)Developers have read-only access to the filesystem on App Engine. 3)App Engine can only execute code called from an HTTP request (except for scheduled background tasks). 4)Users may upload arbitrary Python modules, but only if they are pure-Python; C and Pyrex modules are not supported. 5)App Engine limits the maximum rows returned from an entity get to 1000 rows per Datastore call. 6)Java applications may only use a subset (The JRE Class White List) of the classes from the JRE standard edition. 7)Java applications cannot create new threads. Known Issues!! http://code.google.com/p/googleappengine/issues/list Hard limits Apps per developer - 10 Time per request - 30 sec Files per app - 3,000 HTTP response size - 10 MB Datastore item size - 1 MB Application code size - 150 MB Pro or Con? App Engine's infrastructure removes many of the system administration and development challenges of building applications to scale to millions of hits. Google handles deploying code to a cluster, monitoring, failover, and launching application instances as necessary. While other services let users install and configure nearly any *NIX compatible software, App Engine requires developers to use Python or Java as the programming language and a limited set of APIs. Current APIs allow storing and retrieving data from a BigTable non-relational database; making HTTP requests; sending e-mail; manipulating images; and caching. Most existing Web applications can't run on App Engine without modification, because they require a relational database.

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• Django Models / SQLAlchemy are bloated! Any truly Pythonic DB models out there?

  - by Luke Stanley

  "Make things as simple as possible, but no simpler." Can we find the solution/s that fix the Python database world? from someAmazingDB import * class Task (model): title = '' isDone = False db.taskList = [] #or db.taskList = expandableTypeCollection(Task) #not sure what this syntax would be db['taskList'].append(Task(title='Beat old sql interfaces',done=False)) db.taskList.append(Task('Illustrate different syntax modes',True)) #at this point it should autosave #we should be able to reload the console and access like: >> from someAmazingDB import * >> print 'Done tasks:' >> for task in db.taskList: >> if task.done: >> print task 'Illustrate different syntax modes' I'm a fan of Python, webPy and Cherry Py, and KISS in general. We're talking automatic Python to SQL type translation or NoSQL. We don't have to totally be SQL compatible! Just a scalable subset or ignore it! Re:model changes, it's ok to ask the developer when they try to change it or have a set of sensible defaults. Here is the challenge: The above code should work with very little modification or thinking required. Why must we put up with compromise when we know better? It's 2010, we should be able to code scalable, simple databases in our sleep. If you think this is important, please upvote!

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• Zend file upload error

  - by jgnasser

  I am attempting to upload a file using Zend Framework 1.8 and I get some errors. Here is the code snippet: The form element: $element = new Zend_Form_Element_File('doc'); $element->setLabel('Upload an image:') ->setDestination('/path/to/my/upload/folder'); $element->addValidator('Count', false, 1); $element->addValidator('Size', false, 102400); $element->addValidator('Extension', false, 'jpg,png,gif,doc,docx,xls,xlsx,txt'); $this->addElement($element); The code for handling the upload: $adapter = new Zend_File_Transfer_Adapter_Http(); if (!$adapter->receive()) { $messages = $adapter->getMessages(); echo implode("\n", $messages); } This works fine and the file is uploaded but I get the error "The file 'doc' was illegal uploaded, possible attack". I managed to get past this problem by not creating a new Zend_File_Transfer_Adapter_Http() but instead using: $adapter = $form->doc->getTransferAdapter(); With this modification, the first error disappears but now I have an error saying I have provided 2 files instead of one (probably its reading the temp) and when I adjust the validator to accept two files I then get the arror saying "The file 'doc' was not found" and the upload now fails completely. Please help

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• NSPredicate case-insensitive matching on to-many relationship

  - by Brian Webster

  I am implementing a search field where the user can type in a string to filter the items displayed in a view. Each object being displayed has a keywords to-many relationship, and I would like to be able to filter the objects based on their keywords. Each keyword object has a name property, so I've set up an NSPredicate to do the filtering that looks like this: NSPredicate* predicate = [NSPredicate predicateWithFormat:@"keywords.name CONTAINS %@", self.searchString]; This works, but the problem is that the search is case-sensitive, so if the keyword has a capital letter but the user types in all lowercase, no matches are found. I've tried the following modification: NSPredicate* predicate = [NSPredicate predicateWithFormat:@"keywords.name CONTAINS[c] %@", self.searchString]; But that doesn't make any difference in the case sensitivity of the matching. Is there a way to do this case-insensitive matching using just a plain predicate? Or will I need to implement some sort of custom accessor on the keyword class, e.g. write a lowercaseName method and match against a lowercased version of the search string instead? Addendum: After further exploration, the workaround of adding a custom accessor works OK for manual use of NSPredicate, but does not work at all when using NSFetchRequest with Core Data, which only works when querying attributes defined in the Core Data model.

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• JScrollPane Scrolls Down with Long Text in JEditorPane

  - by Jim

  Hello, I want to have a JEditorPane inside a JScrollPane. When the user clicks a button, the click listener will create a textEditor, call jscrollpane.setViewPort(textEditor), call textEditor.setText(String) to fill it with editable text, and call jscrollpane.getVerticalScrollBar().setValue(0). In case you're wondering, yes, the setText() must come after the setViewPort() for reasons that aren't on topic. Here is the problem: After the user clicks the button, the JScrollPane's view scrolls all the way to the bottom. I want the scrollbar to be at the top, as per the last line in my click listener. I popped open a debugger, and to my horror, discovered that the jscrollpane's viewport is being forced down to the bottom after the conclusion of the click listener (when pumping filters). It appears that Swing is delaying the population of the editor/jscrollpane until after the conclusion of the clicklistener, but is calling the scrollbar command first. Thus, the undesired behavior. Anyway, I'm wondering if there is a clean solution. It seems that wanting a scrollpane to be scrolled to the top after modification would be a reasonably common requirement, so I'm assuming this is a well-solved problem. Thanks!

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• Opacity CSS not working in IE8

  - by Alistair Christie

  I'm using CSS to indicate the trigger text for a jQuery slide-down section: i.e. when you hover over the trigger text the cursor changes to a pointer and the opacity of the trigger text is reduced to indicate that the text has a click action. This works fine in Firefox and Chrome, but in IE8 the opacity doesn't change. I've tried a variety of CSS settings without any success. For example HTML: <h3 class="slidedownTrigger">This is the trigger text</h3> CSS: .slidedownTrigger {     cursor: pointer;     -ms-filter: “progid:DXImageTransform.Microsoft.Alpha(Opacity=75)”;     filter: alpha(opacity=75);     -khtml-opacity: 0.75;     -moz-opacity: 0.75;     opacity: 0.75; } What's stopping IE changing the opacity? Note: I've tried this on a variety of different elements, swapping round the order of the CSS statements, and just using the IE ones on their own. I've also tried using -ms-filter: "alpha(opacity=75)"; but with no success. I've run out of things to try to get opacity modification working in IE8. Any ideas?

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• calling a stored proc over a dblink

  - by neesh

  I am trying to call a stored procedure over a database link. The code looks something like this: declare symbol_cursor package_name.record_cursor; symbol_record package_name.record_name; begin symbol_cursor := package_name.function_name('argument'); loop fetch symbol_cursor into symbol_record; exit when symbol_cursor%notfound; -- Do something with each record here, e.g.: dbms_output.put_line( symbol_record.field_a ); end loop; CLOSE symbol_cursor; When I run this from the same DB instance and schema where package_name belongs to I am able to run it fine. However, when I run this over a database link, (with the required modification to the stored proc name, etc) I get an oracle error: ORA-24338: statement handle not executed. The modified version of this code over a dblink looks like this: declare symbol_cursor package_name.record_cursor@db_link_name; symbol_record package_name.record_name@db_link_name; begin symbol_cursor := package_name.function_name@db_link_name('argument'); loop fetch symbol_cursor into symbol_record; exit when symbol_cursor%notfound; -- Do something with each record here, e.g.: dbms_output.put_line( symbol_record.field_a ); end loop; CLOSE symbol_cursor;

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• How to propagate .java file change to .class under eclipse, tomcat & stripes

  - by BigBourin

  Hi, i'm new to java and i got some problems. i'm developping a web application using the framework stripes on tomcat 6.0. I'm working with eclipse EE on windows. i successfully managed to get the stripes example application (called Bugzooky) up and running on my tomcat server. I imported the .war file and stripes libs in Eclipse. Here is the stripes archive containing the examples and libs But now i'm trying to change the example source files to learn how does it work. but whatever the modification made to the source files "WebContent/WEB-INF/src/*.java", nothing change! even after restarting the server. i noticed that the classes are compiled into .class files in the "ImportedClasses" folder, and tomcat always use these files, they are never updated, and if i removed one of them, the application just don't start. it look like my source files don't exists! I also tried to build my webapp from scratch, but when i tried to use the features used in the example files (like SecurityFilter.java): import javax.servlet.Filter; import javax.servlet.FilterChain; import javax.servlet.FilterConfig; import ... It ends up with plenty of: the import javax.servlet.Filter cannot be resolved I checked the Librairies and it look like i'm using exactly the same as the example. It's probably something i didn't understood about java but i googled 100 times yesterday, and i can't find the solution (i probably didn't search the right place because i don't really understand my problem). I hope you'll be able to help me.

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• How to quickly generate a new string hash after concatenating 2 strings

  - by philcolbourn

  If my math is right, I can quickly generate a new hash value for the concatenation of two strings if I already have the individual hash values for each string. But only if the hash function is of the form: hash(n) = k * hash(n-1) + c(n), and h(0) = 0. In this case, hash( concat(s1,s2) ) = k**length(s2) * hash(s1) + hash(s2) eg. h1 = makeHash32_SDBM( "abcdef", 6 ); h2 = makeHash32_SDBM( "ghijklmn", 8 ); h12 = makeHash32_SDBM( "abcdefghijklmn", 14 ); hx = mod32_powI( 65599, 8 ) * h1 + h2; h1 = 2534611139 h2 = 2107082500 h12 = 1695963591 hx = 1695963591 Note that h12 = hx so this demonstrates the idea. Now, for the SDBM hash k=65599. Whereas the DJB hash has k=33 (or perhaps 31?) and h(0) = 5381 so to make it work you can set h(0) = 0 instead. But a modification on the DJB hash uses xor instead of + to add each character. http://www.cse.yorku.ca/~oz/hash.html Is there another technique to quickly calculate the hash value of concatenated strings if the hash function uses xor instead of +?

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• Are there some cases where Python threads can safely manipulate shared state?

  - by erikg

  Some discussion in another question has encouraged me to to better understand cases where locking is required in multithreaded Python programs. Per this article on threading in Python, I have several solid, testable examples of pitfalls that can occur when multiple threads access shared state. The example race condition provided on this page involves races between threads reading and manipulating a shared variable stored in a dictionary. I think the case for a race here is very obvious, and fortunately is eminently testable. However, I have been unable to evoke a race condition with atomic operations such as list appends or variable increments. This test exhaustively attempts to demonstrate such a race: from threading import Thread, Lock import operator def contains_all_ints(l, n): l.sort() for i in xrange(0, n): if l[i] != i: return False return True def test(ntests): results = [] threads = [] def lockless_append(i): results.append(i) for i in xrange(0, ntests): threads.append(Thread(target=lockless_append, args=(i,))) threads[i].start() for i in xrange(0, ntests): threads[i].join() if len(results) != ntests or not contains_all_ints(results, ntests): return False else: return True for i in range(0,100): if test(100000): print "OK", i else: print "appending to a list without locks *is* unsafe" exit() I have run the test above without failure (100x 100k multithreaded appends). Can anyone get it to fail? Is there another class of object which can be made to misbehave via atomic, incremental, modification by threads? Do these implicitly 'atomic' semantics apply to other operations in Python? Is this directly related to the GIL?

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• PHP Variable with Array

  - by Crays

  Hi guys, i'm trying to make a "update user's power" page. It is something similar to those you can find in say, invisionfree forums. I need it to generate a list of members with checkbox [done] Add an option for it [done] What i don't know how to do is to update, to say, give all the selected users the selected power. Then i went searching for something and found most of them uses array to do this, but i never found one that actually explains how it works. The example i took (with my own modification) was this: while($row = mysql_fetch_array($result)) { echo '<tr>'.$id[]=$rows['id'].''; echo '<td width="50px" align="center" class="TableFormCell"><input type="checkbox" name="option[]" /></td>'; echo '<td width="170px" align="center" class="TableFormCell">'.$row['uname'].'</td>'; echo '</tr>'; } I'm not sure what exactly $id[]=$rows['id'] does I know after the row, my option[] would become an array of option[1], option[2], option[3] for what power should be given, i've got no problem with that but on how to update the database i'm got no clue... for($i=0;$i<$count;$i++){ $sql1="UPDATE ninos SET power='$power' WHERE id='$option[$i]'"; $result1=mysql_query($sql1); } So Say i have 5 users, Aye, Bee, Cee, Dee, Eee with IDs of 1,2,3,4,5 how can i make it so that my script would run like $sql1="UPDATE ninos SET power = '$power' Where id='1','2','3','4','5'"; Please help, thanks.

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• Flexible design - customizable entity model, UI and workflow

  - by Ngm

  Hi All, I want to achieve the following aspects in the software I am building: 1. Customizable entity model 2. Customizable UI 3. Customizable workflow I have thought about an approach to achieve this, I want you to review this and make suggestions: Entity objects should be plain objects and will hold just data Separate Entity model and DB Schema by using an framework (like NHibernate?). This will allow easy modification of entity objects. Business logic to fetch/modify entities has to be granular enough so that they can be invoked as part of the workflow. Business objects should not hold any state, and hence will contain only static methods The workflow will decide depending upon the "state" of an entity/entities which methods on business object/objects to invoke. The workflow should obtain the results of the processing and then pass on the business objects to the appropriate UI screen. The UI screen has to contain instructions about how to display a given entity/entites. Possibly the UI has to be generated dynamically based on a set of UI instructions. (like XUL) What do you think about this approach? Suggest which existing frameworks (like NHiberante, Window Workflow) fit into this model, so that I will not spend time on coding these frameworks Also suggest is there any asp.net framework that can generate dynamic asp.net ajax pages based on a set of UI instructions (like Mozilla XUL)? I have recently been exploring Apache Ofbiz and was impressed by its ability to customize most areas of the application: UI, workflow, entities. Is there any similar (not necessarily an ERP system) application developed in C#/.Net which offers a similar level of customization? I am looking for examples of applications developed in C# that are highly customizable in terms of UI, Workflow and Entity Model

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• Why an auto_ptr can "seal" a container

  - by icephere

  auto_ptr on wikipedia said that "an auto_ptr containing an STL container may be used to prevent further modification of the container.". It used the following example: auto_ptr<vector<ContainedType> > open_vec(new vector<ContainedType>); open_vec->push_back(5); open_vec->push_back(3); // Transfers control, but now the vector cannot be changed: auto_ptr<const vector<ContainedType> > closed_vec(open_vec); // closed_vec->push_back(8); // Can no longer modify If I uncomment the last line, g++ will report an error as t05.cpp:24: error: passing ‘const std::vector<int, std::allocator<int> >’ as ‘this’ argument of ‘void std::vector<_Tp, _Alloc>::push_back(const _Tp&) [with _Tp = int, _Alloc = std::allocator<int>]’ discards qualifiers I am curious why after transferring the ownership of this vector, it can no longer be modified? Thanks a lot!

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