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  • Any way to anticipate session timeout ?

    - by Tom
    Hi, Is there a way to "catch" the session timeout event, so as to retrieve data from HttpSession before its invalidated ? We're implementing the Filter Interface, and in the doFilter method, the user we stored in the session object at login is null when session times out. Thanks in advance.

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  • before_filter with dynamic information

    - by Lauren
    Hi I am trying to add a filter to a controller that is based on a certain role (using role_requirement) and then on the company_id that each user has. So basically I need something like this: require_role "company" ** This is working fine before_filter :company_required def company_required unless current_user.company_id == Company.find(params[:id]) end end The error I am receiving undefined method `company_id' for nil:NilClass I would appreciate any guidance. Thanks

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  • Giving an Error Object Expected Line 48 Char 1

    - by Leslie Peer
    Giving an Error Object Expected Line 48 Char 1------What did I do wrong??? *Note Line # are for reference only not on Original Web page****** <HTML><HEAD><TITLE></TITLE> <META http-equiv=Content-Type content="text/html; charset=utf-8"> <META content="Leslie Peer" name=author> <META content="Created with Trellian WebPage" name=description> <META content="MSHTML 6.00.6000.16809" name=GENERATOR> <META content=Index name=keywords> <STYLE type=text/css>BODY { COLOR: #000000; BACKGROUND-REPEAT: repeat; FONT-FAMILY: Accent SF, Arial, Arial Black, Arial Narrow, Century Gothic, Comic Sans MS, Courier, Courier New, Georgia, Microsoft Sans Serif, Monotype Corsiva, Symbol, Tahoma, Times New Roman; BACKGROUND-COLOR: #666666 } A { FONT-SIZE: 14px; FONT-FAMILY: Arial Black, Bookman Old Style, DnD4Attack, Lucida Console, MS Serif, MS Outlook, MS Sans Serif, Rockwell Extra Bold, Roman, Star Time JL, Tahoma, Terminal, Times New Roman, Verdana, Wingdings 2, Wingdings 3, Wingdings } A:link { COLOR: #9966cc; TEXT-DECORATION: underline } A:visited { COLOR: #66ff66; TEXT-DECORATION: underline } A:hover { COLOR: #ffff00; TEXT-DECORATION: underline } A:active { COLOR: #ff0033; TEXT-DECORATION: underline } H1 { FONT-SIZE: 25px; COLOR: #9966cc; FONT-FAMILY: Century Gothic } H2 { FONT-SIZE: 20px; COLOR: #ff33cc; FONT-FAMILY: Century Gothic } H3 { FONT-SIZE: 18px; COLOR: #6666cc; FONT-FAMILY: Century Gothic } H4 { FONT-SIZE: 15px; COLOR: #00cc33; FONT-FAMILY: Century Gothic } H5 { FONT-SIZE: 10px; COLOR: #ffff33; FONT-FAMILY: Century Gothic } H6 { FONT-SIZE: 5px; COLOR: #996666; FONT-FAMILY: Century Gothic } </STYLE> line 46-<SCRIPT> line 47- CharNum=6; line 48-var Character=newArray();Character[0]="Larry Lightfoot";Character[1]="Sam Wrightfield";Character[2]="Gavin Hartfild";Character[3]="Gail Quickfoot";Character[4]="Robert Gragorian";Character[5]="Peter Shain"; line 49-var ExChar=newArray();ExChar[0]="Tabor Bloomfield"; line 50-var Class=newArray();Class[0]="MagicUser";Class[1]="Fighter";Class[2]="Fighter";Class[3]="Thief";Class[4]="Cleric";Class[5]="Fighter"; line 51-line 47var ExClass=newArray();ExClass[0]="MagicUser"; line 52-var Level=newArray();Level[0]="2";Level[1]="1";Level[2]="1";Level[3]="2";Level[4]="2";Level[5]="1"; line 53-var ExLevel=newArray();ExLevel[0]="23"; line 54-var Hpts=newArray();Hpts[0]="6";Hpts[1]="14";Hpts[2]="13";Hpts[3]="8";Hpts[4]="12";Hpts[5]="15"; line 55-var ExHpts=newArray();ExHpts[0]="145"; line 56-var Armor=newArray();Armor[0]="Cloak";Armor[1]="Splinted Armor";Armor[2]="Chain Armor";Armor[3]="Leather Armor";Armor[4]="Chain Armor";Armor[5]="Splinted Armor"; line 57-var ExArmor=newArray();ExArmor[0]="Robe of Protection +5"; line 58-var Ac1=newArray();Ac1[0]="0";Ac1[1]="3";Ac1[2]="3";Ac1[3]="4";Ac1[4]="2";Ac1[5]="3"; line 59-var ExAc=newArray();ExAc[0]="5"; line 60-var Armor1b=newArray();Armor1b[0]="Ring of Protection +1";Armor1b[1]="Small Shield";Armor1b[2]="Small Shield";Armor1b[3]="Wooden Shield";Armor1b[4]="Large Shield";Armor1b[5]="Small Shield"; line 61-var ExArmor1b=newArray();ExArmor1b[0]="Ring of Protection +5"; line 62-var Ac2=newArray();Ac2[0]="1";Ac2[1]="1";Ac2[2]="1";Ac2[3]="1";Ac2[4]="1";Ac2[5]="1"; line 63-var ExAc1b=newArray();ExAc1b[0]="5" line 64-var Str=newArray();Str[0]="15";Str[1]="16";Str[2]="14";Str[3]="13";Str[4]="14";Str[5]="13"; line 65-var ExStr=newArray();ExStr[0]=21; line 66-var Int=newArray();Int[0]="17";Int[1]="11";Int[2]="12";Int[3]="13";Int[4]="14";Int[5]="13"; line 67-var ExInt=newArray();ExInt[0]="19"; line 68-var Wis=newArray();Wis[0]="17";Wis[1]="12";Wis[2]="14";Wis[3]="13";Wis[4]="14";Wis[5]="12"; line 69-var ExWis=newArray();ExWis[0]="18"; line 70-var Dex=newArray();Dex[0]="15";Dex[1]="14";Dex[2]="13";Dex[3]="15";Dex[4]="14";Dex[5]="12"; line 71-var ExDex=newArray();ExDex[0]="19"; line 72-var Con=newArray();Con[0]="16";Con[1]="15";Con[2]="16";Con[3]="13";Con[4]="12";Con[5]="10"; line 73-var ExCon=newArray();ExCon[0]="19"; line 74-var Chr=newArray();Chr[0]="16";Chr[1]="14";Chr[2]="13";Chr[3]="12";Chr[4]="14";Chr[5]="13"; line 75-var ExChr=newArray();ExChr[0]="21"; line 76-var Expt=newArray();Expt[0]="45";Expt[1]="21";Expt[2]="16";Expt[3]="18";Expt[4]="22";Expt[5]="34"; line 77-var ExExpt=newArray();ExExpt[0]="245678"; line 78-var ExBp=newArray();ExBp[0]="Unknown";ExBp[1]="Extrademensional Plane World of Amborsia";ExBp[2]="Evil Wizard Banished for Mass Geniocodes"; line 79-</SCRIPT> line 80-</HEAD> line 81-<BODY> Giving an Error Object Expected Line 48 Char 1------What did I do wrong??? *Note Line # are for reference only not on Original Web page******

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  • Delete old map markers and load new ones?

    - by pufAmuf
    I'm trying to delete the old markers and load new ones. Here is the code I have that loads certain markers on page load - no issues here: (function() { var customIcons = { 1: { icon: 'redmarker.png', shadow: 'markershadow.png' }, 2: { icon: 'purplemarker.png', shadow: 'markershadow.png' }, 3: { icon: 'silvermarker.png', shadow: 'markershadow.png' }, 4: { icon: 'goldmarker.png', shadow: 'markershadow.png' } }; window.onload = function(){ var MY_MAPTYPE_ID = 'custom'; var stylez = [ { "stylers": [ { "hue": "#00ccff" }, { "saturation": -100 }, { "lightness": 5 } ] },{ } ]; var latlng = new google.maps.LatLng(10, 10); var options = { zoom: 16, center: latlng, panControl: false, zoomControl: false, scaleControl: true, mapTypeControlOptions: { mapTypeIds: [MY_MAPTYPE_ID,google.maps.MapTypeId.SATELLITE] }, mapTypeId: MY_MAPTYPE_ID }; var map = new google.maps.Map(document.getElementById('map'), options); var styledMapOptions = { name: 'Map' }; var jayzMapType = new google.maps.StyledMapType(stylez, styledMapOptions); map.mapTypes.set(MY_MAPTYPE_ID, jayzMapType); var infoWindow = new google.maps.InfoWindow; // Change this depending on the name of your PHP file downloadUrl("getxml.php", function(data) { var xml = data.responseXML; var markers = xml.documentElement.getElementsByTagName("marker"); for (var i = 0; i < markers.length; i++) { var name = markers[i].getAttribute("id"); var address = markers[i].getAttribute("id"); var type = markers[i].getAttribute("venue_type"); var point = new google.maps.LatLng( parseFloat(markers[i].getAttribute("lat")), parseFloat(markers[i].getAttribute("lng"))); var html = "<b>" + name + "</b> <br/>" + address; var icon = customIcons[type] || {}; var marker = new google.maps.Marker({ map: map, position: point, icon: icon.icon, shadow: icon.shadow }); bindInfoWindow(marker, map, infoWindow, html); } }); //BUTTON SWITCHING //////////////////////////////////////////////////////////// //BUTTON SWITCHING //////////////////////////////////////////////////////////// //BUTTON SWITCHING //////////////////////////////////////////////////////////// //BUTTON SWITCHING //////////////////////////////////////////////////////////// //BUTTON SWITCHING //////////////////////////////////////////////////////////// //BUTTON SWITCHING //////////////////////////////////////////////////////////// //BUTTON SWITCHING //////////////////////////////////////////////////////////// jQuery(document).delegate(".topCanBeActive", "click", function( e ) { e.preventDefault(); jQuery(".topCanBeActive").removeClass("topActive"); jQuery(this).addClass("topActive"); switch( this.id ){ case 'all_activity_button': alert("search"); break; case 'events_button': downloadUrl("getxml2.php", function(data) { var xml = data.responseXML; var markers = xml.documentElement.getElementsByTagName("marker"); for (var i = 0; i < markers.length; i++) { var name = markers[i].getAttribute("id"); var address = markers[i].getAttribute("id"); var type = markers[i].getAttribute("venue_type"); var point = new google.maps.LatLng( parseFloat(markers[i].getAttribute("lat")), parseFloat(markers[i].getAttribute("lng"))); var html = "<b>" + name + "</b> <br/>" + address; var icon = customIcons[type] || {}; var marker = new google.maps.Marker({ map: map, position: point, icon: icon.icon, shadow: icon.shadow }); bindInfoWindow(marker, map, infoWindow, html); } }); break; case 'venues_button': alert("venues"); break; case 'search_button': alert("search"); break; } }); //END //////////////////////////////////////////////////////////// //END //////////////////////////////////////////////////////////// //END //////////////////////////////////////////////////////////// //END //////////////////////////////////////////////////////////// //END //////////////////////////////////////////////////////////// //END //////////////////////////////////////////////////////////// //END //////////////////////////////////////////////////////////// //END //////////////////////////////////////////////////////////// } function bindInfoWindow(marker, map, infoWindow, html) { google.maps.event.addListener(marker, 'click', function() { infoWindow.setContent(html); infoWindow.open(map, marker); }); } function downloadUrl(url, callback) { var request = window.ActiveXObject ? new ActiveXObject('Microsoft.XMLHTTP') : new XMLHttpRequest; request.onreadystatechange = function() { if (request.readyState == 4) { request.onreadystatechange = doNothing; callback(request, request.status); } }; request.open('GET', url, true); request.send(null); } function doNothing() {} })(); Now, I created a button section where if you press one button, a different xml file is loaded. Notice the section with the ////////////////////// However, upon clicking the button, nothing happens. The xml file itself is okay and loads the desired data. I also receive no errors in firebug. Any ideas why this happens? Thanks!

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  • I would like to filter XSL output based on a Radio button selection

    - by Phil Speth
    Here is my example I am trying to filter by year based on user selection: I assume some js or jQuery code would be needed: XML file: <?xml version="1.0" encoding="ISO-8859-1"?> <catalog> <cd> <title>Empire Burlesque3</title> <artist>Bob Dylan</artist> <country>USA</country> <company>Columbia</company> <price>10.90</price> <year>1985</year> </cd> <cd> <title>Hide your heart</title> <artist>Bonnie Tyler</artist> <country>UK</country> <company>CBS Records</company> <price>9.90</price> <year>1988</year> </cd> <cd> <title>Greatest Hits</title> <artist>Dolly Parton</artist> <country>USA</country> <company>RCA</company> <price>9.90</price> <year>1982</year> </cd> <cd> <title>Still got the blues</title> <artist>Gary Moore</artist> <country>UK</country> <company>Virgin records</company> <price>10.20</price> <year>1990</year> </cd> <cd> <title>Eros</title> <artist>Eros Ramazzotti</artist> <country>EU</country> <company>BMG</company> <price>9.90</price> <year>1997</year> </cd> <cd> <title>One night only</title> <artist>Bee Gees</artist> <country>UK</country> <company>Polydor</company> <price>10.90</price> <year>1998</year> </cd> <cd> <title>Sylvias Mother</title> <artist>Dr.Hook</artist> <country>UK</country> <company>CBS</company> <price>8.10</price> <year>1973</year> </cd> <cd> <title>Maggie May</title> <artist>Rod Stewart</artist> <country>UK</country> <company>Pickwick</company> <price>8.50</price> <year>1990</year> </cd> <cd> <title>Romanza</title> <artist>Andrea Bocelli</artist> <country>EU</country> <company>Polydor</company> <price>10.80</price> <year>1996</year> </cd> <cd> <title>When a man loves a woman</title> <artist>Percy Sledge</artist> <country>USA</country> <company>Atlantic</company> <price>8.70</price> <year>1987</year> </cd> <cd> <title>Black angel</title> <artist>Savage Rose</artist> <country>EU</country> <company>Mega</company> <price>10.90</price> <year>1995</year> </cd> <cd> <title>1999 Grammy Nominees</title> <artist>Many</artist> <country>USA</country> <company>Grammy</company> <price>10.20</price> <year>1999</year> </cd> <cd> <title>For the good times</title> <artist>Kenny Rogers</artist> <country>UK</country> <company>Mucik Master</company> <price>8.70</price> <year>1995</year> </cd> <cd> <title>Big Willie style</title> <artist>Will Smith</artist> <country>USA</country> <company>Columbia</company> <price>9.90</price> <year>1997</year> </cd> <cd> <title>Tupelo Honey</title> <artist>Van Morrison</artist> <country>UK</country> <company>Polydor</company> <price>8.20</price> <year>1971</year> </cd> <cd> <title>Soulsville</title> <artist>Jorn Hoel</artist> <country>Norway</country> <company>WEA</company> <price>7.90</price> <year>1996</year> </cd> <cd> <title>The very best of</title> <artist>Cat Stevens</artist> <country>UK</country> <company>Island</company> <price>8.90</price> <year>1990</year> </cd> <cd> <title>Stop</title> <artist>Sam Brown</artist> <country>UK</country> <company>A and M</company> <price>8.90</price> <year>1988</year> </cd> <cd> <title>Bridge of Spies</title> <artist>T`Pau</artist> <country>UK</country> <company>Siren</company> <price>7.90</price> <year>1987</year> </cd> <cd> <title>Private Dancer</title> <artist>Tina Turner</artist> <country>UK</country> <company>Capitol</company> <price>8.90</price> <year>1983</year> </cd> <cd> <title>Midt om natten</title> <artist>Kim Larsen</artist> <country>EU</country> <company>Medley</company> <price>7.80</price> <year>1983</year> </cd> <cd> <title>Pavarotti Gala Concert</title> <artist>Luciano Pavarotti</artist> <country>UK</country> <company>DECCA</company> <price>9.90</price> <year>1991</year> </cd> <cd> <title>The dock of the bay</title> <artist>Otis Redding</artist> <country>USA</country> <company>Atlantic</company> <price>7.90</price> <year>1987</year> </cd> <cd> <title>Picture book</title> <artist>Simply Red</artist> <country>EU</country> <company>Elektra</company> <price>7.20</price> <year>1985</year> </cd> <cd> <title>Red</title> <artist>The Communards</artist> <country>UK</country> <company>London</company> <price>7.80</price> <year>1987</year> </cd> <cd> <title>Unchain my heart</title> <artist>Joe Cocker</artist> <country>USA</country> <company>EMI</company> <price>8.20</price> <year>1987</year> </cd> </catalog> XSL File: <?xml version="1.0" encoding="ISO-8859-1"?> <!-- Edited by XMLSpy® --> <xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"> <xsl:template match="/"> <html> <body> <input type="radio" name="Cost" value="1980" checked="checked" /> 1980 <input type="radio" name="Cost" value="1990" /> 1990 <h2>My CD Collection</h2> <table border="1"> <tr bgcolor="#9acd32"> <th>Title</th> <th>Artist</th> </tr> <xsl:for-each select="catalog/cd"> <xsl:if test="year>1990"> <tr> <td><xsl:value-of select="title"/></td> <td><xsl:value-of select="artist"/></td> <td><xsl:value-of select="year"/></td> </tr> </xsl:if> </xsl:for-each> </table> </body> </html> </xsl:template> </xsl:stylesheet>

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  • No bean named 'springSecurityFilterChain' is defined

    - by michaeljackson4ever
    When configs are loaded, I get the error SEVERE: Exception starting filter springSecurityFilterChain org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'springSecurityFilterChain' is defined My sec-config: <http use-expressions="true" access-denied-page="/error/casfailed.html" entry-point-ref="headerAuthenticationEntryPoint"> <intercept-url pattern="/" access="permitAll"/> <!-- <intercept-url pattern="/index.html" access="permitAll"/> --> <intercept-url pattern="/index.html" access="hasAnyRole('ROLE_USER')"/> <intercept-url pattern="/history.html" access="hasAnyRole('ROLE_USER')"/> <intercept-url pattern="/absence.html" access="hasAnyRole('ROLE_USER')"/> <intercept-url pattern="/search.html" access="hasAnyRole('ROLE_USER')"/> <intercept-url pattern="/employees.html" access="hasAnyRole('ROLE_USER')"/> <intercept-url pattern="/employee.html" access="hasAnyRole('ROLE_USER')"/> <intercept-url pattern="/contract.html" access="hasAnyRole('ROLE_USER')"/> <intercept-url pattern="/myforms.html" access="hasAnyRole('HLO','OPISK')"/> <intercept-url pattern="/vacationmsg.html" access="hasAnyRole('ROLE_USER')"/> <intercept-url pattern="/redirect.jsp" filters="none" /> <intercept-url pattern="/error/**" filters="none" /> <intercept-url pattern="/layout/**" filters="none" /> <intercept-url pattern="/js/**" filters="none" /> <intercept-url pattern="/**" access="isAuthenticated()" /> <!-- session-management invalid-session-url="/absence.html"/ --> <!-- logout logout-success-url="/logout.html"/ --> <custom-filter ref="ssoHeaderAuthenticationFilter" before="CAS_FILTER"/> <!-- CAS_FILTER ??? --> </http> <authentication-manager alias="authenticationManager"> <authentication-provider ref="doNothingAuthenticationProvider"/> </authentication-manager> <beans:bean id="doNothingAuthenticationProvider" class="com.nixu.security.sso.web.DoNothingAuthenticationProvider"/> <beans:bean id="ssoHeaderAuthenticationFilter" class="com.nixu.security.sso.web.HeaderAuthenticationFilter"> <beans:property name="groups"> <beans:map> <beans:entry key="cn=lake,ou=confluence,dc=utu,dc=fi" value="ROLE_ADMIN"/> </beans:map> </beans:property> </beans:bean> <beans:bean id="headerAuthenticationEntryPoint" class="com.nixu.security.sso.web.HeaderAuthenticationEntryPoint"/> And web.xml <context-param> <param-name>contextConfigLocation</param-name> <param-value> /WEB-INF/applicationContext.xml /WEB-INF/sec-config.xml /WEB-INF/idm-config.xml /WEB-INF/ldap-config.xml </param-value> </context-param> <display-name>KeyCard</display-name> <context-param> <param-name>webAppRootKey</param-name> <param-value>KeyCardAppRoot</param-value> </context-param> <context-param> <param-name>log4jConfigLocation</param-name> <param-value>/WEB-INF/log4j.properties</param-value> </context-param> <!-- Reads request input using UTF-8 encoding --> <filter> <filter-name>characterEncodingFilter</filter-name> <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class> <init-param> <param-name>encoding</param-name> <param-value>UTF-8</param-value> </init-param> <init-param> <param-name>forceEncoding</param-name> <param-value>true</param-value> </init-param> </filter> <filter> <filter-name>springSecurityFilterChain</filter-name> <filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class> </filter> <filter-mapping> <filter-name>characterEncodingFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <filter-mapping> <filter-name>springSecurityFilterChain</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> <listener> <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class> </listener> <listener> <!-- this is for session scoped objects --> <listener-class>org.springframework.web.context.request.RequestContextListener</listener-class> </listener> <listener> <listener-class>org.springframework.security.web.session.HttpSessionEventPublisher</listener-class> </listener> <!-- Handles all requests into the application --> <servlet> <servlet-name>KeyCard</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <load-on-startup>1</load-on-startup> </servlet> <servlet> <servlet-name>tiles</servlet-name> <servlet-class>org.apache.tiles.web.startup.TilesServlet</servlet-class> <init-param> <param-name> org.apache.tiles.impl.BasicTilesContainer.DEFINITIONS_CONFIG </param-name> <param-value> /WEB-INF/tilesViewContext.xml </param-value> </init-param> <load-on-startup>2</load-on-startup> </servlet> <servlet-mapping> <servlet-name>KeyCard</servlet-name> <url-pattern>*.html</url-pattern> </servlet-mapping> <session-config> <session-timeout> 120 </session-timeout> </session-config> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> <!-- error-page> <exception-type>java.lang.Exception</exception-type> <location>/WEB-INF/error/error.jsp</location> </error-page --> </web-app> What's wrong?

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  • Errors Code: /var/cache/apt/archives/linux-image-3.8.0-19-generic_3.8.0-19.30~precise1_amd64.deb

    - by user286682
    $ sudo apt-get dist-upgrade Reading package lists... Done Building dependency tree Reading state information... Done Calculating upgrade... Done The following packages will be upgraded: linux-image-3.8.0-19-generic 1 upgraded, 0 newly installed, 0 to remove and 0 not upgraded. 6 not fully installed or removed. Need to get 0 B/47.8 MB of archives. After this operation, 142 MB of additional disk space will be used. Do you want to continue [Y/n]? y (Reading database ... 164064 files and directories currently installed.) Preparing to replace linux-image-3.8.0-19-generic 3.8.0-19.29 (using .../linux-image-3.8.0-19-generic_3.8.0-19.30~precise1_amd64.deb) ... Done. Unpacking replacement linux-image-3.8.0-19-generic ... dpkg: error processing /var/cache/apt/archives/linux-image-3.8.0-19-generic_3.8.0-19.30~precise1_amd64.deb (--unpack): trying to overwrite '/lib/modules/3.8.0-19-generic/kernel/arch/x86/kvm/kvm-intel.ko', which is also in package linux-image-extra-3.8.0-19-generic 3.8.0-19.29 dpkg-deb: error: subprocess paste was killed by signal (Broken pipe) Examining /etc/kernel/postrm.d . run-parts: executing /etc/kernel/postrm.d/initramfs-tools 3.8.0-19-generic /boot/vmlinuz-3.8.0-19-generic run-parts: executing /etc/kernel/postrm.d/zz-update-grub 3.8.0-19-generic /boot/vmlinuz-3.8.0-19-generic Errors were encountered while processing: /var/cache/apt/archives/linux-image-3.8.0-19-generic_3.8.0-19.30~precise1_amd64.deb E: Sub-process /usr/bin/dpkg returned an error code (1) How can I get this update to work?

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  • DPKG errors after upgrade to 12.10

    - by James Wulfe
    So I was doing fine then i upgraded my system to 12.10 and now i cant get my system to update all of its packages properly. no matter what i do, cleaning apt cache, manual install using dpkg, etc, i just cant get them to install. what is happening here and how do i fix this. if i would have thought 12.10 would be this much of a hassle i would have never upgraded..... here is a sampling of the code that returns from "apt-get -f install" Preparing to replace usb-modeswitch-data 20120120-0ubuntu1 (using .../usb-modeswitch-data_20120815-1_all.deb) ... /var/lib/dpkg/info/usb-modeswitch-data.prerm: 4: /var/lib/dpkg/info/usb-modeswitch-data.prerm: dpkg-maintscript-helper: Input/output error dpkg: warning: subprocess old pre-removal script returned error exit status 2 dpkg: trying script from the new package instead ... /var/lib/dpkg/tmp.ci/prerm: 4: /var/lib/dpkg/tmp.ci/prerm: dpkg-maintscript-helper: Input/output error dpkg: error processing /var/cache/apt/archives/usb-modeswitch-data_20120815-1_all.deb (--unpack): subprocess new pre-removal script returned error exit status 2 /var/lib/dpkg/info/usb-modeswitch-data.postinst: 7: /var/lib/dpkg/info/usb-modeswitch-data.postinst: dpkg-maintscript-helper: Input/output error dpkg: error while cleaning up: subprocess installed post-installation script returned error exit status 2 Errors were encountered while processing: /var/cache/apt/archives/network-manager_0.9.6.0-0ubuntu7_i386.deb /var/cache/apt/archives/pcmciautils_018-8_i386.deb /var/cache/apt/archives/unity-common_6.10.0-0ubuntu2_all.deb /var/cache/apt/archives/whoopsie_0.2.7_i386.deb /var/cache/apt/archives/usb-modeswitch_1.2.3+repack0-1ubuntu3_i386.deb /var/cache/apt/archives/usb-modeswitch-data_20120815-1_all.deb E: Sub-process /usr/bin/dpkg returned an error code (1) It is also just these 6 packages only. no other packages have given me this kind of trouble. well i should say as of now. It was just 5, but them i got an update for unity, and now unity-common is added to the trouble makers. which prevents me from further upgrading the actual unity package as this package is a dependancy.....

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  • If you favor "T *var", do you ever write "T*"?

    - by Roger Pate
    Thinking about where we place our asterisks; how do those that prefer to keep the "pointerness" away from the type and with the identifier (int *i) write code when the identifier is missing? void f(int*); // 1 void f(int *); // 2 The former seems much more common, no matter what your preference when with the identifier. Is this a special case? What makes it an exception? However, the first still isn't universal, because I have seen the latter style. Besides consistency along the lines of "there's always a space with the identifier, so we have one without", are there any other reasons to prefer it? What about casts or array and function types? How would you re-write these: (void*)var /*or*/ (void *)var int[3] /*or*/ int [3] // more relevant in C++ than C: Example<int[3]> void(int) /*or*/ void (int) // more relevant in C++ than C: std::function<void(int)> The latter two would rarely, if ever, be used in C, but are seen with C++ templates.

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  • Implementing Camera Zoom in a 2D Engine

    - by Luke
    I'm currently trying to implement camera scaling/zoom in my 2D Engine. Normally I calculate the Sprite's drawing size and position similar to this pseudo code: render() { var x = sprite.x; var y = sprite.y; var sizeX = sprite.width * sprite.scaleX; // width of the sprite on the screen var sizeY = sprite.height * sprite.scaleY; // height of the sprite on the screen } To implement the scaling i changed the code to this: class Camera { var scaleX; var scaleY; var zoom; var finalScaleX; // = scaleX * zoom var finalScaleY; // = scaleY * zoom } render() { var x = sprite.x * Camera.finalScaleX; var y = sprite.y * Camera.finalScaleY; var sizeX = sprite.width * sprite.scaleX * Camera.finalScaleX; var sizeY = sprite.height * sprite.scaleY * Camera.finalScaleY; } The problem is that when the zoom is smaller than 1.0 all sprites are moved toward the top-left corner of the screen. This is expected when looking at the code but i want the camera to zoom on the center of the screen. Any tips on how to do that are welcome. :)

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  • SVN Error 403 Forbidden

    - by Chris
    I can't figure this out. I try to import a new project into a svn repository from Netbeans and get 403 Forbidden. I just setup svn on my serverbox today. I can get to it through a browser just fine, though its empty as I haven't imported my project yet. Apache's path for html files is /var/www I setup the svn repo in /var/svn This is the structure of /var/svn [root@localhost svn]# ls -lR /var/svn /var/svn: total 4 drwxrwxrwx 7 apache apache 4096 2010-03-26 10:18 repo /var/svn/repo: total 36 drwxrwxrwx 2 apache apache 4096 2010-03-26 09:47 conf drwxrwxrwx 3 apache apache 4096 2010-03-26 10:18 dav drwxrwsrwx 6 apache apache 4096 2010-03-26 11:19 db -rwxrwxrwx 1 apache apache 2 2010-03-26 09:47 format drwxrwxrwx 2 apache apache 4096 2010-03-26 09:47 hooks drwxrwxrwx 2 apache apache 4096 2010-03-26 09:47 locks -rwxrwxrwx 1 apache apache 229 2010-03-26 09:47 README.txt -rwxrwxrwx 1 apache apache 15 2010-03-26 09:47 svnauth -rwxrwxrwx 1 apache apache 43 2010-03-26 09:48 svnpass /var/svn/repo/conf: total 12 -rwxrwxrwx 1 apache apache 1080 2010-03-26 09:47 authz -rwxrwxrwx 1 apache apache 309 2010-03-26 09:47 passwd -rwxrwxrwx 1 apache apache 2279 2010-03-26 09:47 svnserve.conf /var/svn/repo/dav: total 4 drwxrwxrwx 2 apache apache 4096 2010-03-26 11:19 activities.d /var/svn/repo/dav/activities.d: total 0 /var/svn/repo/db: total 48 -rwxrwxrwx 1 apache apache 2 2010-03-26 09:47 current -rwxrwxrwx 1 apache apache 22 2010-03-26 09:47 format -rwxrwxrwx 1 apache apache 1920 2010-03-26 09:47 fsfs.conf -rwxrwxrwx 1 apache apache 5 2010-03-26 09:47 fs-type -rwxrwxrwx 1 apache apache 2 2010-03-26 09:47 min-unpacked-rev -rwxrwxrwx 1 apache apache 4096 2010-03-26 09:47 rep-cache.db drwxrwsrwx 3 apache apache 4096 2010-03-26 09:47 revprops drwxrwsrwx 3 apache apache 4096 2010-03-26 09:47 revs drwxrwsrwx 2 apache apache 4096 2010-03-26 11:19 transactions -rwxrwxrwx 1 apache apache 2 2010-03-26 11:19 txn-current -rwxrwxrwx 1 apache apache 0 2010-03-26 09:47 txn-current-lock drwxrwsrwx 2 apache apache 4096 2010-03-26 11:19 txn-protorevs -rwxrwxrwx 1 apache apache 37 2010-03-26 09:47 uuid -rwxrwxrwx 1 apache apache 0 2010-03-26 09:47 write-lock /var/svn/repo/db/revprops: total 4 drwxrwsrwx 2 apache apache 4096 2010-03-26 09:47 0 /var/svn/repo/db/revprops/0: total 4 -rwxrwxrwx 1 apache apache 50 2010-03-26 09:47 0 /var/svn/repo/db/revs: total 4 drwxrwsrwx 2 apache apache 4096 2010-03-26 09:47 0 /var/svn/repo/db/revs/0: total 4 -rwxrwxrwx 1 apache apache 115 2010-03-26 09:47 0 /var/svn/repo/db/transactions: total 0 /var/svn/repo/db/txn-protorevs: total 0 /var/svn/repo/hooks: total 36 -rwxrwxrwx 1 apache apache 1955 2010-03-26 09:47 post-commit.tmpl -rwxrwxrwx 1 apache apache 1638 2010-03-26 09:47 post-lock.tmpl -rwxrwxrwx 1 apache apache 2267 2010-03-26 09:47 post-revprop-change.tmpl -rwxrwxrwx 1 apache apache 1567 2010-03-26 09:47 post-unlock.tmpl -rwxrwxrwx 1 apache apache 3404 2010-03-26 09:47 pre-commit.tmpl -rwxrwxrwx 1 apache apache 2410 2010-03-26 09:47 pre-lock.tmpl -rwxrwxrwx 1 apache apache 2764 2010-03-26 09:47 pre-revprop-change.tmpl -rwxrwxrwx 1 apache apache 2100 2010-03-26 09:47 pre-unlock.tmpl -rwxrwxrwx 1 apache apache 2758 2010-03-26 09:47 start-commit.tmpl /var/svn/repo/locks: total 8 -rwxrwxrwx 1 apache apache 139 2010-03-26 09:47 db.lock -rwxrwxrwx 1 apache apache 139 2010-03-26 09:47 db-logs.lock I've got httpd.conf loading svn.conf which contains: <Location /svn> DAV on DAV svn #SVNParentPath /var/svn SVNPath /var/svn/repo Authtype Basic AuthName "Subversion" AuthUserFile /var/svn/repo/svnpass Require valid-user AuthzSVNAccessFile /var/svn/repo/svnauth </Location> Full error message is: org.tigris.subversion.javahl.ClientException: RA layer request failed Server sent unexpected return value (403 Forbidden) in response to CHECKOUT request for '/svn/!svn/bln/0' Sorry for the incredibly long post, but I thought more info would be better than less. I've been fidgeting with this problem for a long time now.

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  • xml append issue in ie,chrome

    - by 3gwebtrain
    Hi, I am creating a html page, using xml data. in which i am using the following function. It works fine with firefox,opera,safari. but in case of ie7,ie8, and chrome the data what i am getting from xml, is not appending properly. any one help me to solve this issue? in case any special thing need to concentrate on append funcation as well let me know.. $(function(){ var thisPage; var parentPage; $('ul.left-navi li a').each(function(){ $('ul.left-navi li a').removeClass('current'); var pathname = (window.location.pathname.match(/[^\/]+$/)[0]); var currentPage = $(this).attr('href'); var pathArr = new Array(); pathArr = pathname.split("."); var file = pathArr[pathArr.length - 2]; thisPage = file; if(currentPage==pathname){ $(this).addClass("active"); } }) $.get('career-utility.xml',function(myData){ var myXml = $(myData).find(thisPage); parentPage = thisPage; var overviewTitle = myXml.find('overview').attr('title'); var description = myXml.find('discription').text(); var mainsublinkTitle = myXml.find('mainsublink').attr('title'); var thisTitle = myXml.find("intro").attr('title'); var thisIntro = myXml.find("introinfo").text(); $('<h3>'+overviewTitle+'</h3>').appendTo('.overViewInfo'); $('<p>'+description+'</p>').appendTo('.overViewInfo'); var sublinks = myXml.find('mainsublink').children('sublink'); $('#intro h3').append(thisTitle); $('#intro').append(thisIntro); sublinks.each(function(numsub){ var newSubLink = $(this); var sublinkPage = $(this).attr('pageto'); var linkInfo = $(this).text(); $('ul.career-link').append('<li><a href="'+sublinkPage+'">'+linkInfo+'</a></li>'); }) $(myXml).find('listgroup').each(function(index){ var count = index; var listGroup = $(this); var listGroupTitle = $(this).attr('title'); var shortNote = $(this).attr('shortnote'); var subLink = $(this).find('sublist'); var firstList = $(this).find('list'); $('.grouplist').append('<div class="list-group"><h3>'+listGroupTitle+'</h3><ul class="level-one level' + count + '"></ul></div>'); firstList.each(function(listnum) { $(this).wrapInner('<li>') .find('sublistgroup').wrapInner('<ul>').children().unwrap() .find('sublist').wrapInner('<li>').children().unwrap(); $('ul.level'+count).append($(this).children()); }); }); }); }) Thanks for advance..

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  • An Introduction to ASP.NET Web API

    - by Rick Strahl
    Microsoft recently released ASP.NET MVC 4.0 and .NET 4.5 and along with it, the brand spanking new ASP.NET Web API. Web API is an exciting new addition to the ASP.NET stack that provides a new, well-designed HTTP framework for creating REST and AJAX APIs (API is Microsoft’s new jargon for a service, in case you’re wondering). Although Web API ships and installs with ASP.NET MVC 4, you can use Web API functionality in any ASP.NET project, including WebForms, WebPages and MVC or just a Web API by itself. And you can also self-host Web API in your own applications from Console, Desktop or Service applications. If you're interested in a high level overview on what ASP.NET Web API is and how it fits into the ASP.NET stack you can check out my previous post: Where does ASP.NET Web API fit? In the following article, I'll focus on a practical, by example introduction to ASP.NET Web API. All the code discussed in this article is available in GitHub: https://github.com/RickStrahl/AspNetWebApiArticle [republished from my Code Magazine Article and updated for RTM release of ASP.NET Web API] Getting Started To start I’ll create a new empty ASP.NET application to demonstrate that Web API can work with any kind of ASP.NET project. Although you can create a new project based on the ASP.NET MVC/Web API template to quickly get up and running, I’ll take you through the manual setup process, because one common use case is to add Web API functionality to an existing ASP.NET application. This process describes the steps needed to hook up Web API to any ASP.NET 4.0 application. Start by creating an ASP.NET Empty Project. Then create a new folder in the project called Controllers. Add a Web API Controller Class Once you have any kind of ASP.NET project open, you can add a Web API Controller class to it. Web API Controllers are very similar to MVC Controller classes, but they work in any kind of project. Add a new item to this folder by using the Add New Item option in Visual Studio and choose Web API Controller Class, as shown in Figure 1. Figure 1: This is how you create a new Controller Class in Visual Studio   Make sure that the name of the controller class includes Controller at the end of it, which is required in order for Web API routing to find it. Here, the name for the class is AlbumApiController. For this example, I’ll use a Music Album model to demonstrate basic behavior of Web API. The model consists of albums and related songs where an album has properties like Name, Artist and YearReleased and a list of songs with a SongName and SongLength as well as an AlbumId that links it to the album. You can find the code for the model (and the rest of these samples) on Github. To add the file manually, create a new folder called Model, and add a new class Album.cs and copy the code into it. There’s a static AlbumData class with a static CreateSampleAlbumData() method that creates a short list of albums on a static .Current that I’ll use for the examples. Before we look at what goes into the controller class though, let’s hook up routing so we can access this new controller. Hooking up Routing in Global.asax To start, I need to perform the one required configuration task in order for Web API to work: I need to configure routing to the controller. Like MVC, Web API uses routing to provide clean, extension-less URLs to controller methods. Using an extension method to ASP.NET’s static RouteTable class, you can use the MapHttpRoute() (in the System.Web.Http namespace) method to hook-up the routing during Application_Start in global.asax.cs shown in Listing 1.using System; using System.Web.Routing; using System.Web.Http; namespace AspNetWebApi { public class Global : System.Web.HttpApplication { protected void Application_Start(object sender, EventArgs e) { RouteTable.Routes.MapHttpRoute( name: "AlbumVerbs", routeTemplate: "albums/{title}", defaults: new { symbol = RouteParameter.Optional, controller="AlbumApi" } ); } } } This route configures Web API to direct URLs that start with an albums folder to the AlbumApiController class. Routing in ASP.NET is used to create extensionless URLs and allows you to map segments of the URL to specific Route Value parameters. A route parameter, with a name inside curly brackets like {name}, is mapped to parameters on the controller methods. Route parameters can be optional, and there are two special route parameters – controller and action – that determine the controller to call and the method to activate respectively. HTTP Verb Routing Routing in Web API can route requests by HTTP Verb in addition to standard {controller},{action} routing. For the first examples, I use HTTP Verb routing, as shown Listing 1. Notice that the route I’ve defined does not include an {action} route value or action value in the defaults. Rather, Web API can use the HTTP Verb in this route to determine the method to call the controller, and a GET request maps to any method that starts with Get. So methods called Get() or GetAlbums() are matched by a GET request and a POST request maps to a Post() or PostAlbum(). Web API matches a method by name and parameter signature to match a route, query string or POST values. In lieu of the method name, the [HttpGet,HttpPost,HttpPut,HttpDelete, etc] attributes can also be used to designate the accepted verbs explicitly if you don’t want to follow the verb naming conventions. Although HTTP Verb routing is a good practice for REST style resource APIs, it’s not required and you can still use more traditional routes with an explicit {action} route parameter. When {action} is supplied, the HTTP verb routing is ignored. I’ll talk more about alternate routes later. When you’re finished with initial creation of files, your project should look like Figure 2.   Figure 2: The initial project has the new API Controller Album model   Creating a small Album Model Now it’s time to create some controller methods to serve data. For these examples, I’ll use a very simple Album and Songs model to play with, as shown in Listing 2. public class Song { public string AlbumId { get; set; } [Required, StringLength(80)] public string SongName { get; set; } [StringLength(5)] public string SongLength { get; set; } } public class Album { public string Id { get; set; } [Required, StringLength(80)] public string AlbumName { get; set; } [StringLength(80)] public string Artist { get; set; } public int YearReleased { get; set; } public DateTime Entered { get; set; } [StringLength(150)] public string AlbumImageUrl { get; set; } [StringLength(200)] public string AmazonUrl { get; set; } public virtual List<Song> Songs { get; set; } public Album() { Songs = new List<Song>(); Entered = DateTime.Now; // Poor man's unique Id off GUID hash Id = Guid.NewGuid().GetHashCode().ToString("x"); } public void AddSong(string songName, string songLength = null) { this.Songs.Add(new Song() { AlbumId = this.Id, SongName = songName, SongLength = songLength }); } } Once the model has been created, I also added an AlbumData class that generates some static data in memory that is loaded onto a static .Current member. The signature of this class looks like this and that's what I'll access to retrieve the base data:public static class AlbumData { // sample data - static list public static List<Album> Current = CreateSampleAlbumData(); /// <summary> /// Create some sample data /// </summary> /// <returns></returns> public static List<Album> CreateSampleAlbumData() { … }} You can check out the full code for the data generation online. Creating an AlbumApiController Web API shares many concepts of ASP.NET MVC, and the implementation of your API logic is done by implementing a subclass of the System.Web.Http.ApiController class. Each public method in the implemented controller is a potential endpoint for the HTTP API, as long as a matching route can be found to invoke it. The class name you create should end in Controller, which is how Web API matches the controller route value to figure out which class to invoke. Inside the controller you can implement methods that take standard .NET input parameters and return .NET values as results. Web API’s binding tries to match POST data, route values, form values or query string values to your parameters. Because the controller is configured for HTTP Verb based routing (no {action} parameter in the route), any methods that start with Getxxxx() are called by an HTTP GET operation. You can have multiple methods that match each HTTP Verb as long as the parameter signatures are different and can be matched by Web API. In Listing 3, I create an AlbumApiController with two methods to retrieve a list of albums and a single album by its title .public class AlbumApiController : ApiController { public IEnumerable<Album> GetAlbums() { var albums = AlbumData.Current.OrderBy(alb => alb.Artist); return albums; } public Album GetAlbum(string title) { var album = AlbumData.Current .SingleOrDefault(alb => alb.AlbumName.Contains(title)); return album; }} To access the first two requests, you can use the following URLs in your browser: http://localhost/aspnetWebApi/albumshttp://localhost/aspnetWebApi/albums/Dirty%20Deeds Note that you’re not specifying the actions of GetAlbum or GetAlbums in these URLs. Instead Web API’s routing uses HTTP GET verb to route to these methods that start with Getxxx() with the first mapping to the parameterless GetAlbums() method and the latter to the GetAlbum(title) method that receives the title parameter mapped as optional in the route. Content Negotiation When you access any of the URLs above from a browser, you get either an XML or JSON result returned back. The album list result for Chrome 17 and Internet Explorer 9 is shown Figure 3. Figure 3: Web API responses can vary depending on the browser used, demonstrating Content Negotiation in action as these two browsers send different HTTP Accept headers.   Notice that the results are not the same: Chrome returns an XML response and IE9 returns a JSON response. Whoa, what’s going on here? Shouldn’t we see the same result in both browsers? Actually, no. Web API determines what type of content to return based on Accept headers. HTTP clients, like browsers, use Accept headers to specify what kind of content they’d like to see returned. Browsers generally ask for HTML first, followed by a few additional content types. Chrome (and most other major browsers) ask for: Accept: text/html, application/xhtml+xml,application/xml; q=0.9,*/*;q=0.8 IE9 asks for: Accept: text/html, application/xhtml+xml, */* Note that Chrome’s Accept header includes application/xml, which Web API finds in its list of supported media types and returns an XML response. IE9 does not include an Accept header type that works on Web API by default, and so it returns the default format, which is JSON. This is an important and very useful feature that was missing from any previous Microsoft REST tools: Web API automatically switches output formats based on HTTP Accept headers. Nowhere in the server code above do you have to explicitly specify the output format. Rather, Web API determines what format the client is requesting based on the Accept headers and automatically returns the result based on the available formatters. This means that a single method can handle both XML and JSON results.. Using this simple approach makes it very easy to create a single controller method that can return JSON, XML, ATOM or even OData feeds by providing the appropriate Accept header from the client. By default you don’t have to worry about the output format in your code. Note that you can still specify an explicit output format if you choose, either globally by overriding the installed formatters, or individually by returning a lower level HttpResponseMessage instance and setting the formatter explicitly. More on that in a minute. Along the same lines, any content sent to the server via POST/PUT is parsed by Web API based on the HTTP Content-type of the data sent. The same formats allowed for output are also allowed on input. Again, you don’t have to do anything in your code – Web API automatically performs the deserialization from the content. Accessing Web API JSON Data with jQuery A very common scenario for Web API endpoints is to retrieve data for AJAX calls from the Web browser. Because JSON is the default format for Web API, it’s easy to access data from the server using jQuery and its getJSON() method. This example receives the albums array from GetAlbums() and databinds it into the page using knockout.js.$.getJSON("albums/", function (albums) { // make knockout template visible $(".album").show(); // create view object and attach array var view = { albums: albums }; ko.applyBindings(view); }); Figure 4 shows this and the next example’s HTML output. You can check out the complete HTML and script code at http://goo.gl/Ix33C (.html) and http://goo.gl/tETlg (.js). Figu Figure 4: The Album Display sample uses JSON data loaded from Web API.   The result from the getJSON() call is a JavaScript object of the server result, which comes back as a JavaScript array. In the code, I use knockout.js to bind this array into the UI, which as you can see, requires very little code, instead using knockout’s data-bind attributes to bind server data to the UI. Of course, this is just one way to use the data – it’s entirely up to you to decide what to do with the data in your client code. Along the same lines, I can retrieve a single album to display when the user clicks on an album. The response returns the album information and a child array with all the songs. The code to do this is very similar to the last example where we pulled the albums array:$(".albumlink").live("click", function () { var id = $(this).data("id"); // title $.getJSON("albums/" + id, function (album) { ko.applyBindings(album, $("#divAlbumDialog")[0]); $("#divAlbumDialog").show(); }); }); Here the URL looks like this: /albums/Dirty%20Deeds, where the title is the ID captured from the clicked element’s data ID attribute. Explicitly Overriding Output Format When Web API automatically converts output using content negotiation, it does so by matching Accept header media types to the GlobalConfiguration.Configuration.Formatters and the SupportedMediaTypes of each individual formatter. You can add and remove formatters to globally affect what formats are available and it’s easy to create and plug in custom formatters.The example project includes a JSONP formatter that can be plugged in to provide JSONP support for requests that have a callback= querystring parameter. Adding, removing or replacing formatters is a global option you can use to manipulate content. It’s beyond the scope of this introduction to show how it works, but you can review the sample code or check out my blog entry on the subject (http://goo.gl/UAzaR). If automatic processing is not desirable in a particular Controller method, you can override the response output explicitly by returning an HttpResponseMessage instance. HttpResponseMessage is similar to ActionResult in ASP.NET MVC in that it’s a common way to return an abstract result message that contains content. HttpResponseMessage s parsed by the Web API framework using standard interfaces to retrieve the response data, status code, headers and so on[MS2] . Web API turns every response – including those Controller methods that return static results – into HttpResponseMessage instances. Explicitly returning an HttpResponseMessage instance gives you full control over the output and lets you mostly bypass WebAPI’s post-processing of the HTTP response on your behalf. HttpResponseMessage allows you to customize the response in great detail. Web API’s attention to detail in the HTTP spec really shows; many HTTP options are exposed as properties and enumerations with detailed IntelliSense comments. Even if you’re new to building REST-based interfaces, the API guides you in the right direction for returning valid responses and response codes. For example, assume that I always want to return JSON from the GetAlbums() controller method and ignore the default media type content negotiation. To do this, I can adjust the output format and headers as shown in Listing 4.public HttpResponseMessage GetAlbums() { var albums = AlbumData.Current.OrderBy(alb => alb.Artist); // Create a new HttpResponse with Json Formatter explicitly var resp = new HttpResponseMessage(HttpStatusCode.OK); resp.Content = new ObjectContent<IEnumerable<Album>>( albums, new JsonMediaTypeFormatter()); // Get Default Formatter based on Content Negotiation //var resp = Request.CreateResponse<IEnumerable<Album>>(HttpStatusCode.OK, albums); resp.Headers.ConnectionClose = true; resp.Headers.CacheControl = new CacheControlHeaderValue(); resp.Headers.CacheControl.Public = true; return resp; } This example returns the same IEnumerable<Album> value, but it wraps the response into an HttpResponseMessage so you can control the entire HTTP message result including the headers, formatter and status code. In Listing 4, I explicitly specify the formatter using the JsonMediaTypeFormatter to always force the content to JSON.  If you prefer to use the default content negotiation with HttpResponseMessage results, you can create the Response instance using the Request.CreateResponse method:var resp = Request.CreateResponse<IEnumerable<Album>>(HttpStatusCode.OK, albums); This provides you an HttpResponse object that's pre-configured with the default formatter based on Content Negotiation. Once you have an HttpResponse object you can easily control most HTTP aspects on this object. What's sweet here is that there are many more detailed properties on HttpResponse than the core ASP.NET Response object, with most options being explicitly configurable with enumerations that make it easy to pick the right headers and response codes from a list of valid codes. It makes HTTP features available much more discoverable even for non-hardcore REST/HTTP geeks. Non-Serialized Results The output returned doesn’t have to be a serialized value but can also be raw data, like strings, binary data or streams. You can use the HttpResponseMessage.Content object to set a number of common Content classes. Listing 5 shows how to return a binary image using the ByteArrayContent class from a Controller method. [HttpGet] public HttpResponseMessage AlbumArt(string title) { var album = AlbumData.Current.FirstOrDefault(abl => abl.AlbumName.StartsWith(title)); if (album == null) { var resp = Request.CreateResponse<ApiMessageError>( HttpStatusCode.NotFound, new ApiMessageError("Album not found")); return resp; } // kinda silly - we would normally serve this directly // but hey - it's a demo. var http = new WebClient(); var imageData = http.DownloadData(album.AlbumImageUrl); // create response and return var result = new HttpResponseMessage(HttpStatusCode.OK); result.Content = new ByteArrayContent(imageData); result.Content.Headers.ContentType = new MediaTypeHeaderValue("image/jpeg"); return result; } The image retrieval from Amazon is contrived, but it shows how to return binary data using ByteArrayContent. It also demonstrates that you can easily return multiple types of content from a single controller method, which is actually quite common. If an error occurs - such as a resource can’t be found or a validation error – you can return an error response to the client that’s very specific to the error. In GetAlbumArt(), if the album can’t be found, we want to return a 404 Not Found status (and realistically no error, as it’s an image). Note that if you are not using HTTP Verb-based routing or not accessing a method that starts with Get/Post etc., you have to specify one or more HTTP Verb attributes on the method explicitly. Here, I used the [HttpGet] attribute to serve the image. Another option to handle the error could be to return a fixed placeholder image if no album could be matched or the album doesn’t have an image. When returning an error code, you can also return a strongly typed response to the client. For example, you can set the 404 status code and also return a custom error object (ApiMessageError is a class I defined) like this:return Request.CreateResponse<ApiMessageError>( HttpStatusCode.NotFound, new ApiMessageError("Album not found") );   If the album can be found, the image will be returned. The image is downloaded into a byte[] array, and then assigned to the result’s Content property. I created a new ByteArrayContent instance and assigned the image’s bytes and the content type so that it displays properly in the browser. There are other content classes available: StringContent, StreamContent, ByteArrayContent, MultipartContent, and ObjectContent are at your disposal to return just about any kind of content. You can create your own Content classes if you frequently return custom types and handle the default formatter assignments that should be used to send the data out . Although HttpResponseMessage results require more code than returning a plain .NET value from a method, it allows much more control over the actual HTTP processing than automatic processing. It also makes it much easier to test your controller methods as you get a response object that you can check for specific status codes and output messages rather than just a result value. Routing Again Ok, let’s get back to the image example. Using the original routing we have setup using HTTP Verb routing there's no good way to serve the image. In order to return my album art image I’d like to use a URL like this: http://localhost/aspnetWebApi/albums/Dirty%20Deeds/image In order to create a URL like this, I have to create a new Controller because my earlier routes pointed to the AlbumApiController using HTTP Verb routing. HTTP Verb based routing is great for representing a single set of resources such as albums. You can map operations like add, delete, update and read easily using HTTP Verbs. But you cannot mix action based routing into a an HTTP Verb routing controller - you can only map HTTP Verbs and each method has to be unique based on parameter signature. You can't have multiple GET operations to methods with the same signature. So GetImage(string id) and GetAlbum(string title) are in conflict in an HTTP GET routing scenario. In fact, I was unable to make the above Image URL work with any combination of HTTP Verb plus Custom routing using the single Albums controller. There are number of ways around this, but all involve additional controllers.  Personally, I think it’s easier to use explicit Action routing and then add custom routes if you need to simplify your URLs further. So in order to accommodate some of the other examples, I created another controller – AlbumRpcApiController – to handle all requests that are explicitly routed via actions (/albums/rpc/AlbumArt) or are custom routed with explicit routes defined in the HttpConfiguration. I added the AlbumArt() method to this new AlbumRpcApiController class. For the image URL to work with the new AlbumRpcApiController, you need a custom route placed before the default route from Listing 1.RouteTable.Routes.MapHttpRoute( name: "AlbumRpcApiAction", routeTemplate: "albums/rpc/{action}/{title}", defaults: new { title = RouteParameter.Optional, controller = "AlbumRpcApi", action = "GetAblums" } ); Now I can use either of the following URLs to access the image: Custom route: (/albums/rpc/{title}/image)http://localhost/aspnetWebApi/albums/PowerAge/image Action route: (/albums/rpc/action/{title})http://localhost/aspnetWebAPI/albums/rpc/albumart/PowerAge Sending Data to the Server To send data to the server and add a new album, you can use an HTTP POST operation. Since I’m using HTTP Verb-based routing in the original AlbumApiController, I can implement a method called PostAlbum()to accept a new album from the client. Listing 6 shows the Web API code to add a new album.public HttpResponseMessage PostAlbum(Album album) { if (!this.ModelState.IsValid) { // my custom error class var error = new ApiMessageError() { message = "Model is invalid" }; // add errors into our client error model for client foreach (var prop in ModelState.Values) { var modelError = prop.Errors.FirstOrDefault(); if (!string.IsNullOrEmpty(modelError.ErrorMessage)) error.errors.Add(modelError.ErrorMessage); else error.errors.Add(modelError.Exception.Message); } return Request.CreateResponse<ApiMessageError>(HttpStatusCode.Conflict, error); } // update song id which isn't provided foreach (var song in album.Songs) song.AlbumId = album.Id; // see if album exists already var matchedAlbum = AlbumData.Current .SingleOrDefault(alb => alb.Id == album.Id || alb.AlbumName == album.AlbumName); if (matchedAlbum == null) AlbumData.Current.Add(album); else matchedAlbum = album; // return a string to show that the value got here var resp = Request.CreateResponse(HttpStatusCode.OK, string.Empty); resp.Content = new StringContent(album.AlbumName + " " + album.Entered.ToString(), Encoding.UTF8, "text/plain"); return resp; } The PostAlbum() method receives an album parameter, which is automatically deserialized from the POST buffer the client sent. The data passed from the client can be either XML or JSON. Web API automatically figures out what format it needs to deserialize based on the content type and binds the content to the album object. Web API uses model binding to bind the request content to the parameter(s) of controller methods. Like MVC you can check the model by looking at ModelState.IsValid. If it’s not valid, you can run through the ModelState.Values collection and check each binding for errors. Here I collect the error messages into a string array that gets passed back to the client via the result ApiErrorMessage object. When a binding error occurs, you’ll want to return an HTTP error response and it’s best to do that with an HttpResponseMessage result. In Listing 6, I used a custom error class that holds a message and an array of detailed error messages for each binding error. I used this object as the content to return to the client along with my Conflict HTTP Status Code response. If binding succeeds, the example returns a string with the name and date entered to demonstrate that you captured the data. Normally, a method like this should return a Boolean or no response at all (HttpStatusCode.NoConent). The sample uses a simple static list to hold albums, so once you’ve added the album using the Post operation, you can hit the /albums/ URL to see that the new album was added. The client jQuery code to call the POST operation from the client with jQuery is shown in Listing 7. var id = new Date().getTime().toString(); var album = { "Id": id, "AlbumName": "Power Age", "Artist": "AC/DC", "YearReleased": 1977, "Entered": "2002-03-11T18:24:43.5580794-10:00", "AlbumImageUrl": http://ecx.images-amazon.com/images/…, "AmazonUrl": http://www.amazon.com/…, "Songs": [ { "SongName": "Rock 'n Roll Damnation", "SongLength": 3.12}, { "SongName": "Downpayment Blues", "SongLength": 4.22 }, { "SongName": "Riff Raff", "SongLength": 2.42 } ] } $.ajax( { url: "albums/", type: "POST", contentType: "application/json", data: JSON.stringify(album), processData: false, beforeSend: function (xhr) { // not required since JSON is default output xhr.setRequestHeader("Accept", "application/json"); }, success: function (result) { // reload list of albums page.loadAlbums(); }, error: function (xhr, status, p3, p4) { var err = "Error"; if (xhr.responseText && xhr.responseText[0] == "{") err = JSON.parse(xhr.responseText).message; alert(err); } }); The code in Listing 7 creates an album object in JavaScript to match the structure of the .NET Album class. This object is passed to the $.ajax() function to send to the server as POST. The data is turned into JSON and the content type set to application/json so that the server knows what to convert when deserializing in the Album instance. The jQuery code hooks up success and failure events. Success returns the result data, which is a string that’s echoed back with an alert box. If an error occurs, jQuery returns the XHR instance and status code. You can check the XHR to see if a JSON object is embedded and if it is, you can extract it by de-serializing it and accessing the .message property. REST standards suggest that updates to existing resources should use PUT operations. REST standards aside, I’m not a big fan of separating out inserts and updates so I tend to have a single method that handles both. But if you want to follow REST suggestions, you can create a PUT method that handles updates by forwarding the PUT operation to the POST method:public HttpResponseMessage PutAlbum(Album album) { return PostAlbum(album); } To make the corresponding $.ajax() call, all you have to change from Listing 7 is the type: from POST to PUT. Model Binding with UrlEncoded POST Variables In the example in Listing 7 I used JSON objects to post a serialized object to a server method that accepted an strongly typed object with the same structure, which is a common way to send data to the server. However, Web API supports a number of different ways that data can be received by server methods. For example, another common way is to use plain UrlEncoded POST  values to send to the server. Web API supports Model Binding that works similar (but not the same) as MVC's model binding where POST variables are mapped to properties of object parameters of the target method. This is actually quite common for AJAX calls that want to avoid serialization and the potential requirement of a JSON parser on older browsers. For example, using jQUery you might use the $.post() method to send a new album to the server (albeit one without songs) using code like the following:$.post("albums/",{AlbumName: "Dirty Deeds", YearReleased: 1976 … },albumPostCallback); Although the code looks very similar to the client code we used before passing JSON, here the data passed is URL encoded values (AlbumName=Dirty+Deeds&YearReleased=1976 etc.). Web API then takes this POST data and maps each of the POST values to the properties of the Album object in the method's parameter. Although the client code is different the server can both handle the JSON object, or the UrlEncoded POST values. Dynamic Access to POST Data There are also a few options available to dynamically access POST data, if you know what type of data you're dealing with. If you have POST UrlEncoded values, you can dynamically using a FormsDataCollection:[HttpPost] public string PostAlbum(FormDataCollection form) { return string.Format("{0} - released {1}", form.Get("AlbumName"),form.Get("RearReleased")); } The FormDataCollection is a very simple object, that essentially provides the same functionality as Request.Form[] in ASP.NET. Request.Form[] still works if you're running hosted in an ASP.NET application. However as a general rule, while ASP.NET's functionality is always available when running Web API hosted inside of an  ASP.NET application, using the built in classes specific to Web API makes it possible to run Web API applications in a self hosted environment outside of ASP.NET. If your client is sending JSON to your server, and you don't want to map the JSON to a strongly typed object because you only want to retrieve a few simple values, you can also accept a JObject parameter in your API methods:[HttpPost] public string PostAlbum(JObject jsonData) { dynamic json = jsonData; JObject jalbum = json.Album; JObject juser = json.User; string token = json.UserToken; var album = jalbum.ToObject<Album>(); var user = juser.ToObject<User>(); return String.Format("{0} {1} {2}", album.AlbumName, user.Name, token); } There quite a few options available to you to receive data with Web API, which gives you more choices for the right tool for the job. Unfortunately one shortcoming of Web API is that POST data is always mapped to a single parameter. This means you can't pass multiple POST parameters to methods that receive POST data. It's possible to accept multiple parameters, but only one can map to the POST content - the others have to come from the query string or route values. I have a couple of Blog POSTs that explain what works and what doesn't here: Passing multiple POST parameters to Web API Controller Methods Mapping UrlEncoded POST Values in ASP.NET Web API   Handling Delete Operations Finally, to round out the server API code of the album example we've been discussin, here’s the DELETE verb controller method that allows removal of an album by its title:public HttpResponseMessage DeleteAlbum(string title) { var matchedAlbum = AlbumData.Current.Where(alb => alb.AlbumName == title) .SingleOrDefault(); if (matchedAlbum == null) return new HttpResponseMessage(HttpStatusCode.NotFound); AlbumData.Current.Remove(matchedAlbum); return new HttpResponseMessage(HttpStatusCode.NoContent); } To call this action method using jQuery, you can use:$(".removeimage").live("click", function () { var $el = $(this).parent(".album"); var txt = $el.find("a").text(); $.ajax({ url: "albums/" + encodeURIComponent(txt), type: "Delete", success: function (result) { $el.fadeOut().remove(); }, error: jqError }); }   Note the use of the DELETE verb in the $.ajax() call, which routes to DeleteAlbum on the server. DELETE is a non-content operation, so you supply a resource ID (the title) via route value or the querystring. Routing Conflicts In all requests with the exception of the AlbumArt image example shown so far, I used HTTP Verb routing that I set up in Listing 1. HTTP Verb Routing is a recommendation that is in line with typical REST access to HTTP resources. However, it takes quite a bit of effort to create REST-compliant API implementations based only on HTTP Verb routing only. You saw one example that didn’t really fit – the return of an image where I created a custom route albums/{title}/image that required creation of a second controller and a custom route to work. HTTP Verb routing to a controller does not mix with custom or action routing to the same controller because of the limited mapping of HTTP verbs imposed by HTTP Verb routing. To understand some of the problems with verb routing, let’s look at another example. Let’s say you create a GetSortableAlbums() method like this and add it to the original AlbumApiController accessed via HTTP Verb routing:[HttpGet] public IQueryable<Album> SortableAlbums() { var albums = AlbumData.Current; // generally should be done only on actual queryable results (EF etc.) // Done here because we're running with a static list but otherwise might be slow return albums.AsQueryable(); } If you compile this code and try to now access the /albums/ link, you get an error: Multiple Actions were found that match the request. HTTP Verb routing only allows access to one GET operation per parameter/route value match. If more than one method exists with the same parameter signature, it doesn’t work. As I mentioned earlier for the image display, the only solution to get this method to work is to throw it into another controller. Because I already set up the AlbumRpcApiController I can add the method there. First, I should rename the method to SortableAlbums() so I’m not using a Get prefix for the method. This also makes the action parameter look cleaner in the URL - it looks less like a method and more like a noun. I can then create a new route that handles direct-action mapping:RouteTable.Routes.MapHttpRoute( name: "AlbumRpcApiAction", routeTemplate: "albums/rpc/{action}/{title}", defaults: new { title = RouteParameter.Optional, controller = "AlbumRpcApi", action = "GetAblums" } ); As I am explicitly adding a route segment – rpc – into the route template, I can now reference explicit methods in the Web API controller using URLs like this: http://localhost/AspNetWebApi/rpc/SortableAlbums Error Handling I’ve already done some minimal error handling in the examples. For example in Listing 6, I detected some known-error scenarios like model validation failing or a resource not being found and returning an appropriate HttpResponseMessage result. But what happens if your code just blows up or causes an exception? If you have a controller method, like this:[HttpGet] public void ThrowException() { throw new UnauthorizedAccessException("Unauthorized Access Sucka"); } You can call it with this: http://localhost/AspNetWebApi/albums/rpc/ThrowException The default exception handling displays a 500-status response with the serialized exception on the local computer only. When you connect from a remote computer, Web API throws back a 500  HTTP Error with no data returned (IIS then adds its HTML error page). The behavior is configurable in the GlobalConfiguration:GlobalConfiguration .Configuration .IncludeErrorDetailPolicy = IncludeErrorDetailPolicy.Never; If you want more control over your error responses sent from code, you can throw explicit error responses yourself using HttpResponseException. When you throw an HttpResponseException the response parameter is used to generate the output for the Controller action. [HttpGet] public void ThrowError() { var resp = Request.CreateResponse<ApiMessageError>( HttpStatusCode.BadRequest, new ApiMessageError("Your code stinks!")); throw new HttpResponseException(resp); } Throwing an HttpResponseException stops the processing of the controller method and immediately returns the response you passed to the exception. Unlike other Exceptions fired inside of WebAPI, HttpResponseException bypasses the Exception Filters installed and instead just outputs the response you provide. In this case, the serialized ApiMessageError result string is returned in the default serialization format – XML or JSON. You can pass any content to HttpResponseMessage, which includes creating your own exception objects and consistently returning error messages to the client. Here’s a small helper method on the controller that you might use to send exception info back to the client consistently:private void ThrowSafeException(string message, HttpStatusCode statusCode = HttpStatusCode.BadRequest) { var errResponse = Request.CreateResponse<ApiMessageError>(statusCode, new ApiMessageError() { message = message }); throw new HttpResponseException(errResponse); } You can then use it to output any captured errors from code:[HttpGet] public void ThrowErrorSafe() { try { List<string> list = null; list.Add("Rick"); } catch (Exception ex) { ThrowSafeException(ex.Message); } }   Exception Filters Another more global solution is to create an Exception Filter. Filters in Web API provide the ability to pre- and post-process controller method operations. An exception filter looks at all exceptions fired and then optionally creates an HttpResponseMessage result. Listing 8 shows an example of a basic Exception filter implementation.public class UnhandledExceptionFilter : ExceptionFilterAttribute { public override void OnException(HttpActionExecutedContext context) { HttpStatusCode status = HttpStatusCode.InternalServerError; var exType = context.Exception.GetType(); if (exType == typeof(UnauthorizedAccessException)) status = HttpStatusCode.Unauthorized; else if (exType == typeof(ArgumentException)) status = HttpStatusCode.NotFound; var apiError = new ApiMessageError() { message = context.Exception.Message }; // create a new response and attach our ApiError object // which now gets returned on ANY exception result var errorResponse = context.Request.CreateResponse<ApiMessageError>(status, apiError); context.Response = errorResponse; base.OnException(context); } } Exception Filter Attributes can be assigned to an ApiController class like this:[UnhandledExceptionFilter] public class AlbumRpcApiController : ApiController or you can globally assign it to all controllers by adding it to the HTTP Configuration's Filters collection:GlobalConfiguration.Configuration.Filters.Add(new UnhandledExceptionFilter()); The latter is a great way to get global error trapping so that all errors (short of hard IIS errors and explicit HttpResponseException errors) return a valid error response that includes error information in the form of a known-error object. Using a filter like this allows you to throw an exception as you normally would and have your filter create a response in the appropriate output format that the client expects. For example, an AJAX application can on failure expect to see a JSON error result that corresponds to the real error that occurred rather than a 500 error along with HTML error page that IIS throws up. You can even create some custom exceptions so you can differentiate your own exceptions from unhandled system exceptions - you often don't want to display error information from 'unknown' exceptions as they may contain sensitive system information or info that's not generally useful to users of your application/site. This is just one example of how ASP.NET Web API is configurable and extensible. Exception filters are just one example of how you can plug-in into the Web API request flow to modify output. Many more hooks exist and I’ll take a closer look at extensibility in Part 2 of this article in the future. Summary Web API is a big improvement over previous Microsoft REST and AJAX toolkits. The key features to its usefulness are its ease of use with simple controller based logic, familiar MVC-style routing, low configuration impact, extensibility at all levels and tight attention to exposing and making HTTP semantics easily discoverable and easy to use. Although none of the concepts used in Web API are new or radical, Web API combines the best of previous platforms into a single framework that’s highly functional, easy to work with, and extensible to boot. I think that Microsoft has hit a home run with Web API. Related Resources Where does ASP.NET Web API fit? Sample Source Code on GitHub Passing multiple POST parameters to Web API Controller Methods Mapping UrlEncoded POST Values in ASP.NET Web API Creating a JSONP Formatter for ASP.NET Web API Removing the XML Formatter from ASP.NET Web API Applications© Rick Strahl, West Wind Technologies, 2005-2012Posted in Web Api   Tweet !function(d,s,id){var js,fjs=d.getElementsByTagName(s)[0];if(!d.getElementById(id)){js=d.createElement(s);js.id=id;js.src="//platform.twitter.com/widgets.js";fjs.parentNode.insertBefore(js,fjs);}}(document,"script","twitter-wjs"); (function() { var po = document.createElement('script'); po.type = 'text/javascript'; po.async = true; po.src = 'https://apis.google.com/js/plusone.js'; var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(po, s); })();

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  • Dynamic Filtering

    - by Ricardo Peres
    Continuing my previous posts on dynamic LINQ, now it's time for dynamic filtering. For now, I'll focus on string matching. There are three standard operators for string matching, which both NHibernate, Entity Framework and LINQ to SQL recognize: Equals Contains StartsWith EndsWith So, if we want to apply filtering by one of these operators on a string property, we can use this code: public enum MatchType { StartsWith = 0, EndsWith = 1, Contains = 2, Equals = 3 } public static List Filter(IEnumerable enumerable, String propertyName, String filter, MatchType matchType) { return (Filter(enumerable, typeof(T), propertyName, filter, matchType) as List); } public static IList Filter(IEnumerable enumerable, Type elementType, String propertyName, String filter, MatchType matchType) { MethodInfo asQueryableMethod = typeof(Queryable).GetMethods(BindingFlags.Static | BindingFlags.Public).Where(m = (m.Name == "AsQueryable") && (m.ContainsGenericParameters == false)).Single(); IQueryable query = (enumerable is IQueryable) ? (enumerable as IQueryable) : asQueryableMethod.Invoke(null, new Object [] { enumerable }) as IQueryable; MethodInfo whereMethod = typeof(Queryable).GetMethods(BindingFlags.Public | BindingFlags.Static).Where(m = m.Name == "Where").ToArray() [ 0 ].MakeGenericMethod(elementType); MethodInfo matchMethod = typeof(String).GetMethod ( (matchType == MatchType.StartsWith) ? "StartsWith" : (matchType == MatchType.EndsWith) ? "EndsWith" : (matchType == MatchType.Contains) ? "Contains" : "Equals", new Type [] { typeof(String) } ); PropertyInfo displayProperty = elementType.GetProperty(propertyName, BindingFlags.Public | BindingFlags.Instance); MemberExpression member = Expression.MakeMemberAccess(Expression.Parameter(elementType, "n"), displayProperty); MethodCallExpression call = Expression.Call(member, matchMethod, Expression.Constant(filter)); LambdaExpression where = Expression.Lambda(call, member.Expression as ParameterExpression); query = whereMethod.Invoke(null, new Object [] { query, where }) as IQueryable; MethodInfo toListMethod = typeof(Enumerable).GetMethod("ToList", BindingFlags.Static | BindingFlags.Public).MakeGenericMethod(elementType); IList list = toListMethod.Invoke(null, new Object [] { query }) as IList; return (list); } var list = new [] { new { A = "aa" }, new { A = "aabb" }, new { A = "ccaa" }, new { A = "ddaadd" } }; var contains = Filter(list, "A", "aa", MatchType.Contains); var endsWith = Filter(list, "A", "aa", MatchType.EndsWith); var startsWith = Filter(list, "A", "aa", MatchType.StartsWith); var equals = Filter(list, "A", "aa", MatchType.Equals); Perhaps I'll write some more posts on this subject in the near future. SyntaxHighlighter.config.clipboardSwf = 'http://alexgorbatchev.com/pub/sh/2.0.320/scripts/clipboard.swf'; SyntaxHighlighter.brushes.CSharp.aliases = ['c#', 'c-sharp', 'csharp']; SyntaxHighlighter.all();

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  • Ubuntu - why would /var/log/dmesg stop updating after boot? does not show panic/cpu_hung errors which the console shows

    - by Tom G
    So I have an Ubuntu 10.04 install VM on a host. Latest 2.6.38-15-server kernel . /var/log/dmesg displays only the bootup but will stop recording after that. It will not show the trace/cpu_hung errors I am trying to troubleshoot. /var/log/dmesg.0 , dmesg.1 nothing - I did a string search for the text that displays on the console during the crash and NOTHING gets logged anywhere in /var/log/* . I have to call into the provider and ask them to take a screenshot of the console since nothing shows in dmesg. Why would /var/log/dmesg not record kernel panics, or such?

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  • Why are my files in /var/lock and where did they just go?!

    - by Nicky Hajal
    I am hosting a website on Debian 5.0 & Apache2. Today one of my websites was down, Apache said it couldn't find the directory. I located the files and the whole site once in /var/www/site was now /var/lock/site. All the files were present. I was confused, but figured I'd just move it back. mv /var/lock/site /var/www All looked fine... Except that only the directories moved and the files appear to be lost! I am working on restoring from backups but I would really love to know what happened and where my files went (the backups are a few days old). Thanks for your help!

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  • How to change suexec root directory from "/var/www" to "/home"?

    - by Oudin
    Hi I've installed suexec using on ubuntu 12.04: apt-get install apache2 apache2-suexec libapache2-mod-fcgid php5-cgi However when I run the following command: sudo /usr/lib/apache2/suexec -V I get the following info: -D AP_DOC_ROOT="/var/www" -D AP_GID_MIN=100 -D AP_HTTPD_USER="www-data" -D AP_LOG_EXEC="/var/log/apache2/suexec.log" -D AP_SAFE_PATH="/usr/local/bin:/usr/bin:/bin" -D AP_UID_MIN=100 -D AP_USERDIR_SUFFIX="public_html" I'm utilizing "/home/user/public_html" to serve users content on the web not "/var/www" How can I change the root directory to "/home"?

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  • Where can I find a good, tab-less privacy filter for my monitor?

    - by KeyStroke
    Hi, I have an ASUS laptop with a 14" monitor (12" by 7" to be more specific), and I've been looking for a decent privacy filter that I can use with for, yet I couldn't find any. The problem with the filters I've found is that they all use those ugly "tabs" that you have to stick on the sides of your monitor in order to slip the filter in. I'm looking for ones that are like HP privacy filter, where parts of it goes under the frame of the monitor to hold it in place. Too bad HP doesn't sell filters that fit my screen. So, any idea where I can get a good privacy filter? Your help is so much appreciated

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  • Symfony dynamic subdomains

    - by Jamie
    Hi all, I'm trying to match subdomains to a customer id in symfony. i.e. i have customer1.example.com and customer2.example.com Domains are stored in a table. When a user goes to customer1.example.com, I would like to get the subdomain, look up the domain name in the database, once matched, it will then deploy the app config for that customer and then store the customer_Id in a global attribute so i know exactly which customer I'm dealing with througout the whole application. The virtual host will have the relevant wildcard servername. Have you managed to achieve this, and if so, how? If not, any ideas would be a great help! I'm thinking about using a filter to do it. :-)

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  • Validation of user input or ?????????

    - by zaf
    We're letting users search a database from a single text input and I'm having difficulties in filtering some user supplied strings. For example, if the user submits: ????????? lcd SONY (Note the ?'s) I need to cancel the search. I include the base64 encoded version of the above string wrapped up so that its easy run: print(base64_decode("1MfLxc/RwdPHIGxjZCBTT05Z")); I've ignored such inputs before but now (am not sure why) just realised the mysql database query is taking nearly forever to execute so this is now on high priority. Another example to highlight that we are using utf-8 and mb_detect_encoding is not helping much: print(base64_decode("zqDOm8+Fzr3PhM63z4HOuc6/IM+Bzr/Phc+HzyU=")); ????t???? ?????% So: how can I detect/filter these inputs? how is this input being generated?

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  • Drupal filter_form form input

    - by ernie
    This drupal form snippet will give me a textarea with user able to change filter to full html/wysiwyg mode. My Questions: How can I default to to full html mode? function MY_MODULE_admin() { $form = array(); $form['format'] = filter_form($form->format); // MY_MODULE - ** Image 1 ** $form['MY_MODULE_image_1'] = array( '#type' => 'textarea', '#title' => t('Image 1'), '#default_value' => variable_get('setup_image_1', 'image_1.jpg'), '#description' => "Current value =" .variable_get('setup_image_1', 'image_1.jpg'), '#required' => TRUE, );

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  • OpenFileDialog - only display filenames that have no extensions

    - by fraXis
    Hello, I have the following code in my C# program: OpenFileDialog fDialog = new OpenFileDialog(); fDialog.Title = "Open a file"; fDialog.Filter = "NCF files (*.ncf)|*.ncf|All files (*.*)|*.*|No Extensions (*.)|*."; I want to be able to have the user pick from the following: .NCF (files with .NCF extension only) *.* (all files) and files that have no extensions such as: readme (with no .txt) I know *.* will do this, but it also displays the .NCF, .TXT, and all other files in the same directory. I just want to be able to display filenames that have no extensions. Filtering with *. does not do the trick. Is there a way I can do this with C#? Thanks.

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  • Using hash functions with Bloom filters

    - by dangerstat
    Hi, A bloom filter uses a hash function (or many) to generate a value between 0 and m given an input string X. My question is how to you use a hash function to generate a value in this way, for example an MD5 hash is typically represented by a 32 length hex string, how would I use an MD5 hashing algorithm to generate a value between 0 and m where I can specify m? I'm using Java at the moment so an example of to do this with the MessageDigest functionality it offers would be great, though just a generic description of how to do about it would be fine too. Thanks

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