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  • Add rss xmlns namespace definition to a php simplexml document?

    - by talkingnews
    I'm trying to create an itunes-valid podcast feed using php5's simplexml: <?php $xml_string = <<<XML <?xml version="1.0" encoding="UTF-8"?> <channel> </channel> XML; $xml_generator = new SimpleXMLElement($xml_string); $tnsoundfile = $xml_generator->addChild('title', 'Main Title'); $tnsoundfile->addChild('itunes:author', "Author", ' '); $tnsoundfile->addChild('category', 'Audio Podcasts'); $tnsoundfile = $xml_generator->addChild('item'); $tnsoundfile->addChild('title', 'The track title'); $enclosure = $tnsoundfile->addChild('enclosure'); $enclosure->addAttribute('url', 'http://test.com'); $enclosure->addAttribute('length', 'filelength'); $enclosure->addAttribute('type', 'audio/mpeg'); $tnsoundfile->addChild('itunes:author', "Author", ' '); header("Content-Type: text/xml"); echo $xml_generator->asXML(); ?> It doesn't validate, because I've got to put the line: <rss xmlns:itunes="http://www.itunes.com/dtds/podcast-1.0.dtd" version="2.0"> as per http://www.apple.com/itunes/podcasts/specs.html. So the output SHOULD be: <?xml version="1.0" encoding="UTF-8"?> <rss xmlns:itunes="http://www.itunes.com/dtds/podcast-1.0.dtd" version="2.0"> <channel> etc. I've been over and over the manual and forums, just can't get it right. If I put, near the footer: header("Content-Type: text/xml"); echo '<rss xmlns:itunes="http://www.itunes.com/dtds/podcast-1.0.dtd" version="2.0">'; echo $xml_generator->asXML(); ?> Then it sort of looks right in firefox and it doesn't complain about undefined namespaces anymore, but feedvalidator complains that line 1, column 77: XML parsing error: :1:77: xml declaration not at start of external entity [help] because the document now starts: <rss xmlns:itunes="http://www.itunes.com/dtds/podcast-1.0.dtd" version="2.0"><?xml version="1.0" encoding="UTF-8"?> and not <?xml version="1.0" encoding="UTF-8"?><rss xmlns:itunes="http://www.itunes.com/dtds/podcast-1.0.dtd" version="2.0"> Thank you in advance.

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  • Rails choking on the content of this request because of protect_from_forgery

    - by randombits
    I'm trying to simply test my RESTful API with cURL. Using the following invocation: curl -d "name=jimmy" -H "Content-Type: application/x-www-form-urlencoded" http://127.0.0.1:3000/people.xml -i Rails is dying though: ActionController::InvalidAuthenticityToken (ActionController::InvalidAuthenticityToken): :8:in `synchronize' Looks like it's running this through a protect_from_forgery filter. I thought protect_from_forgery is excluded for non-HTML HTTP POST/PUT/DELETE type requests? This is clearly targeting the XML format. If I pass actual XML content, it works. But my users will be submitting POST data as URL encoded parameters. I know all the various ways I can disable protect_from_forgery but what's the proper way of handling this? I want to leave it on so that when I do have HTML based forms and handle format.html, I don't forget to re-enable it for then. I want users to be able to make HTTP POST requests to my XML-based API though and not get bombarded with this.

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  • App engine datastore - query on Enum fields.

    - by Gopi
    I am using GAE(Java) with JDO for persistence. I have an entity with a Enum field which is marked as @Persistent and gets saved correctly into the datastore (As observed from the Datastore viewer in Development Console). But when I query these entities putting a filter based on the Enum value, it is always returning me all the entities whatever value I specify for the enum field. I know GAE java supports enums being persisted just like basic datatypes. But does it also allow retrieving/querying based on them? Google search could not point me to any such example code. Details: I have printed the Query just before being executed. So in two cases the query looks like - SELECT FROM com.xxx.yyy.User WHERE role == super ORDER BY key desc RANGE 0,50 SELECT FROM com.xxx.yyy.User WHERE role == admin ORDER BY key desc RANGE 0,50 Both above queries return me all the User entities from datastore in spite of datastore viewer showing some Users are of type 'admin' and some are of type 'super'.

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  • Tomcat IIS 7 Integration gives 503 errors on all requests.

    - by Yvan JANSSENS
    Hi, After many attempts to install Tomcat on IIS 7, I finally managed to get it working. At least I think so :-S. I finally got the 500 errors away, by setting the correct permissions. The only thing that doesn't work is ... serving stuff: neither regular stuff (like ASP, HTML files, or directory browsing) or Tomcat things work. Here are my configs: Worker.properties # The workers that your plugins should create and work with # worker.list=worker1 #------ DEFAULT ajp13 WORKER DEFINITION ------------------------------ #--------------------------------------------------------------------- # Defining a worker named ajp13 and of type ajp13 # Note that the name and the type do not have to match. # worker.worker1.port=8009 worker.worker1.host=127.0.0.1 worker.worker1.type=ajp13 URIWorkerMap.properties /|/*=worker1 # Exclude the subdirectory static: !/static|/*=worker1 # Exclude some suffixes: !*.html=worker1 !*.asp=worker1 Server.xml <?xml version='1.0' encoding='utf-8'?> <!-- Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file distributed with this work for additional information regarding copyright ownership. The ASF licenses this file to You under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. --> <!-- Note: A "Server" is not itself a "Container", so you may not define subcomponents such as "Valves" at this level. Documentation at /docs/config/server.html --> <Server port="8005" shutdown="SHUTDOWN"> <!--APR library loader. Documentation at /docs/apr.html --> <Listener className="org.apache.catalina.core.AprLifecycleListener" SSLEngine="on" /> <!--Initialize Jasper prior to webapps are loaded. Documentation at /docs/jasper-howto.html --> <Listener className="org.apache.catalina.core.JasperListener" /> <!-- Prevent memory leaks due to use of particular java/javax APIs--> <Listener className="org.apache.catalina.core.JreMemoryLeakPreventionListener" /> <!-- JMX Support for the Tomcat server. Documentation at /docs/non-existent.html --> <Listener className="org.apache.catalina.mbeans.ServerLifecycleListener" /> <Listener className="org.apache.catalina.mbeans.GlobalResourcesLifecycleListener" /> <!-- Global JNDI resources Documentation at /docs/jndi-resources-howto.html --> <GlobalNamingResources> <!-- Editable user database that can also be used by UserDatabaseRealm to authenticate users --> <Resource name="UserDatabase" auth="Container" type="org.apache.catalina.UserDatabase" description="User database that can be updated and saved" factory="org.apache.catalina.users.MemoryUserDatabaseFactory" pathname="conf/tomcat-users.xml" /> </GlobalNamingResources> <!-- A "Service" is a collection of one or more "Connectors" that share a single "Container" Note: A "Service" is not itself a "Container", so you may not define subcomponents such as "Valves" at this level. Documentation at /docs/config/service.html --> <Service name="Catalina"> <!--The connectors can use a shared executor, you can define one or more named thread pools--> <!-- <Executor name="tomcatThreadPool" namePrefix="catalina-exec-" maxThreads="150" minSpareThreads="4"/> --> <!-- A "Connector" represents an endpoint by which requests are received and responses are returned. Documentation at : Java HTTP Connector: /docs/config/http.html (blocking & non-blocking) Java AJP Connector: /docs/config/ajp.html APR (HTTP/AJP) Connector: /docs/apr.html Define a non-SSL HTTP/1.1 Connector on port 8080 --> <Connector port="8080" protocol="HTTP/1.1" connectionTimeout="20000" redirectPort="8443" /> <!-- A "Connector" using the shared thread pool--> <!-- <Connector executor="tomcatThreadPool" port="8080" protocol="HTTP/1.1" connectionTimeout="20000" redirectPort="8443" /> --> <!-- Define a SSL HTTP/1.1 Connector on port 8443 This connector uses the JSSE configuration, when using APR, the connector should be using the OpenSSL style configuration described in the APR documentation --> <!-- <Connector port="8443" protocol="HTTP/1.1" SSLEnabled="true" maxThreads="150" scheme="https" secure="true" clientAuth="false" sslProtocol="TLS" /> --> <!-- Define an AJP 1.3 Connector on port 8009 --> <Connector port="8009" protocol="AJP/1.3" redirectPort="8443" /> <!-- An Engine represents the entry point (within Catalina) that processes every request. The Engine implementation for Tomcat stand alone analyzes the HTTP headers included with the request, and passes them on to the appropriate Host (virtual host). Documentation at /docs/config/engine.html --> <!-- You should set jvmRoute to support load-balancing via AJP ie : <Engine name="Catalina" defaultHost="localhost" jvmRoute="jvm1"> --> <Engine name="Catalina" defaultHost="localhost"> <!--For clustering, please take a look at documentation at: /docs/cluster-howto.html (simple how to) /docs/config/cluster.html (reference documentation) --> <!-- <Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster"/> --> <!-- The request dumper valve dumps useful debugging information about the request and response data received and sent by Tomcat. Documentation at: /docs/config/valve.html --> <!-- <Valve className="org.apache.catalina.valves.RequestDumperValve"/> --> <!-- This Realm uses the UserDatabase configured in the global JNDI resources under the key "UserDatabase". Any edits that are performed against this UserDatabase are immediately available for use by the Realm. --> <Realm className="org.apache.catalina.realm.UserDatabaseRealm" resourceName="UserDatabase"/> <!-- Define the default virtual host Note: XML Schema validation will not work with Xerces 2.2. --> <Host name="localhost" appBase="webapps" unpackWARs="true" autoDeploy="true" xmlValidation="false" xmlNamespaceAware="false"> <!-- SingleSignOn valve, share authentication between web applications Documentation at: /docs/config/valve.html --> <!-- <Valve className="org.apache.catalina.authenticator.SingleSignOn" /> --> <!-- Access log processes all example. Documentation at: /docs/config/valve.html --> <!-- <Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs" prefix="localhost_access_log." suffix=".txt" pattern="common" resolveHosts="false"/> --> </Host> </Engine> </Service> </Server> http://localhost:8080 is working, I can view the apps and configure them there... I'm quite new to IIS 7, I used to work with IIS 6. Thanks in advance, Yvan

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  • java - useBean in jsp and getAttribute in jsp but NULL

    - by ravi parekh
    user is null in servlet. Pls let me if doing mistake. i m trying to get all html element in bean rateCode.jsp **<%@page import="com.hermes.data.RateCode_" %>** <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <html> <head> <title>Rate Code</title> </head> <body> **<jsp:useBean id="user" class="com.hermes.data.RateCode_" scope="session" > <jsp:setProperty name="user" property="*"/></jsp:useBean>** <form id="f_rateCode" action="/ratePromoCodes" method="post" > <table align="center" border="1" cellspacing="0"> <tr> <td colspan="2" align="center" class="header">Rate Code Administrations</td> </tr> <tr> <td align="right" style="border-style: solid;">Rate Code:</td> <td align="left" style="border-style: solid;"> <input type="text" id="code" name="code" value="${user.code}" size="10" maxlength="32" style="width: 100px"/> </td> </tr> <tr> <td align="right" style="border-style: solid;">Rate Description:</td> <td align="left" style="border-style: solid;"> <input type="text" id="description" name="description" value="<%=user.getDescription()%>" maxlength="128" size="40"></td> </tr> <tr><td><input type="submit" value="ok" /></td> </tr> </table> </form> Servlet - ratePromoCodes protected void doPost(HttpServletRequest req, HttpServletResponse resp) { RateCode rc = (RateCode) req.getAttribute("user"); Enumeration an = req.getAttributeNames(); Enumeration pn = req.getParameterNames(); Object o = null; while (an.hasMoreElements()) { o = an.nextElement(); System.out.println(o); } while (pn.hasMoreElements()) { o = pn.nextElement(); System.out.println(o); } } RateCode.java (javaBean) public class RateCode_ { private String code ; private String description; public String getCode() { return code; } public void setCode(String code) { this.code = code; } public String getDescription() { return description; } public void setDescription(String description) { this.description = description; } }

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  • InvalidCastException in DataGridView

    - by Max Yaffe
    (Using VS 2010 Beta 2 - .Net 4.0 B2 Rel) I have a class, MyTable, derived from BindingList where S is a struct. S is made up of several other structs, for example: public class MyTable<S>:BindingList<S> where S: struct { ... } public struct MyStruct { public MyReal r1; public MyReal r2; public MyReal R1 {get{...} set{...}} public MyReal R2 {get{...} set{...}} ... } public struct MyReal { private Double d; private void InitFromString(string) {this.d = ...;} public MyReal(Double d) { this.d = d;} public MyReal(string val) { this.d = default(Double); InitFromString(val);} public override string ToString() { return this.real.ToString();} public static explicit operator MyReal(string s) { return new MyReal(s);} public static implicit operator String(MyReal r) { return r.ToString();} ... } OK, I use the MyTable as a binding source for a DataGridView. I can load the data grid easily using InitFromString on individual fields in MyStruct. The problem comes when I try to edit a value in a cell of the DataGridView. Going to the first row, first column, I change the value of the existing number. It gives an exception blizzard, the first line of which says: System.FormatException: Invalid cast from 'System.String' to 'MyReal' I've looked at the casting discussions and reference books but don't see any obvious problems. Any ideas?

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  • Fields of class, are they stored in the stack or heap?

    - by Mirek
    I saw a question yesterday which raised (for me) another question. Please look at the following code: public class Class1 { int A; //as I uderstand, int is value type and therefore lives in the stack } class Class2 { Run() { Class1 instance1 = new Class1(); instance1.A = 10; //it points to value type, but isnt this reference (on heap)? } } Or while creating the instance of Class1, its field types are created on the heap as well? But then I do not understand when it would really be on the stack as almost always you need to create an instance of object in order to use it fields.

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  • about httpd.conf

    - by nightingale2k1
    Hi I'm starting to learn symfony for php framework and I got problem with httpd.conf configuration. First, I have xampplite installed on my windows c:\xampplite\ and then I created a symfony project (as described on getting started guide) c:\xampplite\htdocs\symfonytest\ Everything works fine when I tried to access http://localhost/symfonytest/web/ (all icons and text are displayed pretty well) Now I got to configure the httpd.conf and I type like this: <VirtualHost 127.0.0.1/symfonytest> DocumentRoot "c:\xampplite\htdocs\symfonytest\web" DirectoryIndex index.php <Directory "c:\xampplite\htdocs\symfonytest\web"> AllowOverride All Allow from All </Directory> Alias /sf c:\xampplite\htdocs\symfonytest\web\sf <Directory "c:\xampplite\htdocs\symfonytest\web\sf"> AllowOverride All Allow from All </Directory> But it has no effect at all ... when I type http://127.0.0.1/symfonytest/ it still displayed directory list of my c:\xampplite\htdocs\symfonytest\ How to solve this httpd.conf problem? Thank you !!!

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  • How to read a CLOB column in Oracle using OleDb ?

    - by T.Falise
    Hi, I have created a table on an Oracle 10g database with this structure : create table myTable ( id number(32,0) primary key, myData clob ) I can insert rows in the table without any problem, but when I try to read data from the table using OleDb connection, I get an exception. Here is the code I use : using (OleDbConnection dbConnection = new OleDbConnection("ConnectionString")) { dbConnection.Open(); OleDbCommand dbCommand = dbConnection.CreateCommand(); dbCommand.CommandText = "SELECT * FROM myTable WHERE id=?"; dbCommand.Parameters.AddWithValue("ID", id); OleDbDataReader dbReader = dbCommand.ExecuteReader(); } The exception details seems to point on an unsupported data type : System.Data.OleDb.OleDbException: Unspecified error Oracle error occurred, but error message could not be retrieved from Oracle. Data type is not supported. Does anyone know how I can read this data using the OleDb connection ? PS : The driver used in this case is the Microsoft one.

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  • setting a value through jquery

    - by Hulk
    <script> function edit(elem) { var ele=$(elem).siblings('label#test').html(); var a=document.getElementById('test'); var htm = '<input type="text" name="modal" id="modal" style="width:70%;" value="'+$(elem).siblings('label#test').html();+'"/>'; $dialog.html(htm) .dialog({ autoOpen: true, position: 'center' , title: 'EDIT', draggable: false, width : 300, height : 40, resizable : false, modal : true, buttons: { "Save" : function() { if($('#modal').val() != ''){a.value=$('#modal').val();$dialog.dialog('close');} else {alert('i++'+$('#modal').val()+'++');} } } }); $dialog.dialog('open'); } $(document).ready(function() { var flag=0; $("input:radio[@name=template]").click(function() { var checkedoption = $(this).val(); if (checkedoption == "template3") { if (flag == 0) { var html = '<input type="text" name="val" id="val" />&nbsp;&nbsp;&nbsp;<input type="button" value="Add" id="add"><br>'; $('#useroptions').append(html); flag=1; $('#add').click(function(){ var a = $('#val').val(); if (a == '') { alert('Enter options'); } else { var section= '<tr class="clickable"><td id="userval" BGCOLOR="#FF6699"><label id="test">' + a + '</label>&nbsp;&nbsp;&nbsp; <IMG SRC="/media/img/chunkedit.gif" onclick="javascript:edit(this);" >&nbsp;&nbsp;&nbsp;<IMG SRC="/media/img/close.gif" onclick="javascript:remove(this);" ></td></tr>'; $('#useroptions').append(section); } }); } } }); }); </script> <form> <table> <tr><td> <div id="useroptions"></div> </tr></td> </table> </form> How to set a new value for test in the above code.. Thanks

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  • MacPorts on Snow Leopard: Python install seems to succeed but doesn't install a non-system Python

    - by thebossman
    I've installed Python via MacPorts. According to this question, the files in /opt/local/bin should run the "correct" Python version. However, all those files are symlinks to: /opt/local/Library/Frameworks/Python.framework/Versions/2.6/bin/ Running them directly from that folder (using no symlinks) runs an Apple build of Python! Python 2.6.6 (r266:84292, Jan 6 2011, 13:25:25) [GCC 4.2.1 (Apple Inc. build 5664)] on darwin Type "help", "copyright", "credits" or "license" for more information. >>> For comparison, running /usr/bin/python shows a slightly different version: Python 2.6.1 (r261:67515, Jun 24 2010, 21:47:49) [GCC 4.2.1 (Apple Inc. build 5646)] on darwin Type "help", "copyright", "credits" or "license" for more information. >>> They're both Apple builds! How do I install the correct version?

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  • Binding IsReadOnly using IValueConverter

    - by mastur cheef
    Maybe I'm misunderstanding how to use an IValueConverter or data binding (which is likely), but I am currently trying to set the IsReadOnly property of a DataGridTextColumn depending on the value of a string. Here is the XAML: <DataGridTextColumn Binding="{Binding Path=GroupDescription}" Header="Name" IsReadOnly="{Binding Current, Converter={StaticResource currentConverter}}"/> And here is my converter: public class CurrentConverter : IValueConverter { public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) { string s = value as string; if (s == "Current") { return false; } else { return true; } } public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) { throw new NotSupportedException(); } } Currently, the column is always editable, the converter seems to do nothing. Does anyone have some thoughts as to why this is happening?

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  • Embedded Javascript in Master Page or Pages That Use Master Page throw "Object Expected Error"

    - by Philter
    I'm semi-new to writing ASP.Net applications using master pages and I've run into an issue I've spent some time on but can't seem to solve. My situation is that I have a master page with a structure that looks like this: <head runat="server"> <title>Test Site</title> <link rel="Stylesheet" type="text/css" href="Default.css" /> <script type="text/javascript" language="javascript" src="js/Default.js" /> <meta http-equiv="Expires" content="0"/> <meta http-equiv="Cache-Control" content="no-cache"/> <meta http-equiv="Pragma" content="no-cache"/> <asp:ContentPlaceHolder ID="cphHead" runat="server"> </asp:ContentPlaceHolder> </head> <body> <form id="form1" runat="server"> <div id="divHeader"> <asp:ContentPlaceHolder ID="cphPageTitle" runat="server"></asp:ContentPlaceHolder> </div> <div id="divMainContent"> <asp:ContentPlaceHolder ID="cphMainContent" runat="server"></asp:ContentPlaceHolder> </div> </div> </form> </body> I then have a page that uses this master page that contains the following: <asp:Content ContentPlaceHolderID="cphHead" runat="server"> <script type="text/javascript" language="javascript" > function test() { alert("Hello World"); } </script> </asp:Content> <asp:Content ContentPlaceHolderID="cphMainContent" runat="server"> <fieldset> <img alt="Select As Of Date" src="Images/Calendar.png" id="aAsOfDate" class="clickable" runat="server" onclick="test();" /> <asp:Button runat="server" CssClass="buttonStyle" ID="btnSubmit" Text="Submit" OnClick="btnSubmit_Clicked"/> </fieldset> </asp:Content> When I run this page and click on the image I get an "Object Expected" error. However, if I place the test function into my Default.js external file it will function perfectly. I can't seem to figure out why this is happening. Any ideas?

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  • bad request error 400 while using python requests.post function

    - by Toussah
    I'm trying to make a simple post request via the requests library of Python and I get a bad request error (400) while my url is supposedly correct since I can use it to perform a get. I'm very new in REST requests, I read many tutorials and documentation but I guess there are still things I don't get so my error could be basic. Maybe a lack of understanding on the type of url I'm supposed to send via POST. Here my code : import requests v_username = "username" v_password = "password" v_headers = {'content-type':'application/rdf+xml'} url = 'https://my.url' params = {'param': 'val_param'} payload = {'data': 'my_data'} r = requests.post(url, params = params, auth=(v_username, v_password), data=payload, headers=v_headers, verify=False) print r I used the example of the requests documentation.

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  • How to use Scala interpreter options with SBT?

    - by John Threepwood
    When using the Scala interpreter, one could start it with an option like: C:\Users\John>scala -unchecked Welcome to Scala version 2.9.2 (Java HotSpot(TM) Client VM, Java 1.6.0_32). Type in expressions to have them evaluated. Type :help for more information. scala> When using sbt, how can one start the Scala interpreter with options ? The following try will not work: C:\Users\John\Test Scala Project 1>sbt [...] [info] Loading global plugins from C:\Users\John\.sbt\plugins [info] Set current project to default-8d4ecc (in build file:/C:/Users/John/Tes t%20Scala%20Project%201/) > console -unchecked [error] Expected end of input. [error] console -unchecked [error] ^ With Google & Co I could not figure out how to do this from within the sbt shell. Does anyone know ?

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  • How to represent different entities that have identical behavior?

    - by Dominik
    I have several different entities in my domain model (animal species, let's say), which have a few properties each. The entities are readonly (they do not change state during the application lifetime) and they have identical behavior (the differ only by the values of properties). How to implement such entities in code? Unsuccessful attempts: Enums I tried an enum like this: enum Animals { Frog, Duck, Otter, Fish } And other pieces of code would switch on the enum. However, this leads to ugly switching code, scattering the logic around and problems with comboboxes. There's no pretty way to list all possible Animals. Serialization works great though. Subclasses I also thought about where each animal type is a subclass of a common base abstract class. The implementation of Swim() is the same for all Animals, though, so it makes little sense and serializability is a big issue now. Since we represent an animal type (species, if you will), there should be one instance of the subclass per application, which is hard and weird to maintain when we use serialization. public abstract class AnimalBase { string Name { get; set; } // user-readable double Weight { get; set; } Habitat Habitat { get; set; } public void Swim(); { /* swim implementation; the same for all animals but depends uses the value of Weight */ } } public class Otter: AnimalBase{ public Otter() { Name = "Otter"; Weight = 10; Habitat = "North America"; } } // ... and so on Just plain awful. Static fields This blog post gave me and idea for a solution where each option is a statically defined field inside the type, like this: public class Animal { public static readonly Animal Otter = new Animal { Name="Otter", Weight = 10, Habitat = "North America"} // the rest of the animals... public string Name { get; set; } // user-readable public double Weight { get; set; } public Habitat Habitat { get; set; } public void Swim(); } That would be great: you can use it like enums (AnimalType = Animal.Otter), you can easily add a static list of all defined animals, you have a sensible place where to implement Swim(). Immutability can be achieved by making property setters protected. There is a major problem, though: it breaks serializability. A serialized Animal would have to save all its properties and upon deserialization it would create a new instance of Animal, which is something I'd like to avoid. Is there an easy way to make the third attempt work? Any more suggestions for implementing such a model?

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  • How to spot empty parking spaces?

    - by mithila
    I want to do a final year B.Sc project on parking space detection. Can anybody give me some link related to it? Any text-book, tutorial or anything? What would be prerequisite for this project? What type of skills(programming/math) are needed? What are the initial steps to do? What type of readings(algorithms of image processing) are needed? Detail added in comments: i'm going to use camera, not infrared. i would like to use still images, or one camera which captures images from a parking lot. i think reak-time processing will be tough, at this moment i just need to start the project. so still images will work fine. but later it may b a real-time project

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  • What's the difference between !col and col=false in MySQL?

    - by Mask
    The two statements have totally different performance: mysql> explain select * from jobs where createIndexed=false; +----+-------------+-------+------+----------------------+----------------------+---------+-------+------+-------+ | id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra | +----+-------------+-------+------+----------------------+----------------------+---------+-------+------+-------+ | 1 | SIMPLE | jobs | ref | i_jobs_createIndexed | i_jobs_createIndexed | 1 | const | 1 | | +----+-------------+-------+------+----------------------+----------------------+---------+-------+------+-------+ 1 row in set (0.01 sec) mysql> explain select * from jobs where !createIndexed; +----+-------------+-------+------+---------------+------+---------+------+-------+-------------+ | id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra | +----+-------------+-------+------+---------------+------+---------+------+-------+-------------+ | 1 | SIMPLE | jobs | ALL | NULL | NULL | NULL | NULL | 17996 | Using where | +----+-------------+-------+------+---------------+------+---------+------+-------+-------------+ Column definition and related index for aiding analysis: createIndexed tinyint(1) NOT NULL DEFAULT 0, create index i_jobs_createIndexed on jobs(createIndexed);

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  • Very unusual and weird problem with gVim 7.2

    - by Fabian
    After installing gVim and running gvim from the run window, if I were to type :cd followed by a tab, I will get \AppData, \Application Data, etc. Which basically means I'm at my $HOME directory (C:\Users\Fabian). The weird thing is I do not have a \Application Data folder there. But if I were to run gvim.exe from its installation folder, and I type :cd followed by tab, I would get \autoload, \colors, etc. which means I'm at the installation folder. And if I were to pin gvim.exe on to taskbar, upon launch and typing :cd then tab, I will get \Dictionaries and upon hitting tab again I get a beep. I think for the last scenario, I'm at some Adobe folder. Anybody knows how to fix this weird issue? I'd like to pin it to taskbar and upon launch, start in the $HOME directory (C:\Users\Fabian).

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  • (C#) Get index of current foreach iteration

    - by Graphain
    Hi, Is there some rare language construct I haven't encountered (like the few I've learned recently, some on Stack Overflow) in C# to get a value representing the current iteration of a foreach loop? For instance, I currently do something like this depending on the circumstances: int i=0; foreach (Object o in collection) { ... i++; } Answers: @bryansh: I am setting the class of an element in a view page based on the position in the list. I guess I could add a method that gets the CSSClass for the Objects I am iterating through but that almost feels like a violation of the interface of that class. @Brad Wilson: I really like that - I've often thought about something like that when using the ternary operator but never really given it enough thought. As a bit of food for thought it would be nice if you could do something similar to somehow add (generically to all IEnumerable objects) a handle on the enumerator to increment the value that an extension method returns i.e. inject a method into the IEnumerable interface that returns an iterationindex. Of course this would be blatant hacks and witchcraft... Cool though... @crucible: Awesome I totally forgot to check the LINQ methods. Hmm appears to be a terrible library implementation though. I don't see why people are downvoting you though. You'd expect the method to either use some sort of HashTable of indices or even another SQL call, not an O(N) iteration... (@Jonathan Holland yes you are right, expecting SQL was wrong) @Joseph Daigle: The difficulty is that I assume the foreach casting/retrieval is optimised more than my own code would be. @Jonathan Holland: Ah, cheers for explaining how it works and ha at firing someone for using it.

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  • jquery loop to create elements

    - by Andy Simpson
    Dear all, I have had no luck with this task so far so grateful for any help. I have an html form, in which there is a small select menu (1-10) ie <select> <option value = '1'>1</option> <option value = '2'>2</option> ... <option value = '10'>10</option> </select> depending on what value is selected i would like jquery to create (or remove) that number of input text boxes (with different names and id's). eg if 2 was selected these inputs would be created: <input type = 'text' name = 'name1' id = 'id1' /> <input type = 'text' name = 'name2' id = 'id2' /> i look forward to your no doubt simple and elegant solutions! andy

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  • How to rotate an SSE/AVX vector

    - by user1584773
    I need to perform a rotate operation with as little clock cycle as possible. In the first case let's assume __m128i as source and dest type source: || A0 || A1 || A2 || A3 || dest : || A1 || A2 || A3 || A0 || dest = (__m128i)_mm_shuffle_epi32((__m128i)source, _MM_SHUFFLE(0,3,2,1)); Now I want to do the same whit AVX intrinsics So let's assume this time __m256i as source and dest type source: || A0 || A1 || A2 || A3 || A4 || A5 || A6 || A7 || dest : || A1 || A2 || A3 || A4 || A5 || A6 || A7 || A0 || The Avx intrinsics is missing most of the corresponding SSE integer operations. Maybe there is some way go get the desider output working with the floating point version. I've tryed with: dest = (__m256i)_mm256_shuffle_ps((__m256)source, (__m256)source, _MM_SHUFFLE(0,3,2,1)); but what I get is: || A0 || A2 || A3 || A4 || A5 || A6 || A7 || A1 || Any Idea on how to solve this in an efficient way? (without mixing SSE and AVX operation and without "manually" inverting A0 and A1 Thanks in advance!

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  • Generic structure for performing string conversion when data binding.

    - by Rohan West
    Hi there, a little while ago i was reading an article about a series of class that were created that handled the conversion of strings into a generic type. Below is a mock class structure. Basically if you set the StringValue it will perform some conversion into type T public class MyClass<T> { public string StringValue {get;set;} public T Value {get;set;} } I cannot remember the article that i was reading, or the name of the class i was reading about. Is this already implemented in the framework? Or shall i create my own?

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  • Using ed to manipulate files matched by find

    - by TheOsp
    Following the bash-hackers wiki's recommendation, I want to edit files using ed. In particular I want to do the following with ed instead of sed: find . -type f -exec sed -i -e 's/a/b/g' {} \; I see that ed doesn't have opt like sed's -e, so as far as I know, pipes and io redirections are the only way to work with it non-interactively. So, using ed from a bash script to do the same as the above sed command would look like: ed file_name <<<$'g/a/s//b/g\nw' Or echo $'g/a/s//b/g\nw' | ed file_name But as far as I know it is impossible to involve pipes or io redirections within find's -exec. Do I miss something? or is the only way to overcome this is to use loops? for file in $(find . -type f -print); do ed $file <<<$'g/a/s//b/g\nw'; done;

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  • Can't use FAXCOMEXLib in VS 2010 anymore?

    - by Sam
    I'm just in the process of moving from Visual Studio 2008 to Visual Studio 2010. One of my projects use the Microsoft Fax Service Extended COM Type Library. After converting the project to VS 2010 I get the following compiler error: C:\Windows\Microsoft.NET\Framework\v4.0.30319\Microsoft.Common.Targets(1558,9): error MSB3648: The Keycontainer-path "VS_KEY_812A0248FF872DEC" ist invalid. KeyContainer must point to an existing file. C:\Windows\Microsoft.NET\Framework\v4.0.30319\Microsoft.Common.Targets(1558,9): warning MSB3283: Wrapperassembly for type library "FAXCOMEXLib" not found. I tried to remove FAXCOMEXLib from the project and adding it again, but it did not help. I got a similar problem with other COM references. How do I resolve this?

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