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• When should I use static methods in a class and what are the benefits?

  - by NAVEED

  I have concept of static variables but what are the benefits of static methods in a class. I have worked on some projects but I did not make a method static. Whenever I need to call a method of a class, I create an object of that class and call the desired method. Static variable in a method holds it's value even when method is executed but accessible only in its containing method but what is the best definition of static method? Is calling the static method without creating object of that class is the only benefit of static method? What is the accessible range for static method? What is the syntax to create and calling static method in php? Thanks

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• Grails deploy on Tomcat6

  - by Jack

  Hello, while trying to deploy a Grails application into tomcat6 I ran into some problems: I used the grails war command to build up a war, then copied it to var/lib/tomcat6/webapps and tried to restart the container. I had to change default Tomcat policy to skip security exceptions, since I couldn't access environment variable (like grails.env), then tried again but it gives me an exception related to instantiating something, but it's not clear where should I try to fix the error, according to tomcat6 logs the problem is: SEVERE: Exception sending context initialized event to listener instance of class org.codehaus.groovy.grails.web.context.GrailsC$ org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'pluginManager' defined in ServletContext$ at java.lang.Thread.run(Thread.java:619) Caused by: org.codehaus.groovy.grails.exceptions.NewInstanceCreationException: Could not create a new instance of class [Hiberna$ ... 1 more Caused by: java.lang.NoClassDefFoundError: org.hibernate.cfg.Environment It seems like it's unable to load org.hibernate.cfg.Environment class. I checked the applicationContext.xml and it refers to grails.xml to search for plugins, in this last file I actually have HibernateGrailsPlugin. Where should I look to find if the plugin is present?

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• using Applescript to retrieve movie file duration via Finder properties

  - by Matt

  When using Get Info on movie files in the Finder, I've noticed that many movie files have an accessible "Duration" property under the More Info tab. Is there an easy way to access this data using Applescript? I've tried lines like "set theTime to (duration of aFile)", but it doesn't seem to be as simple as that. Ideally I'd like to access the movie duration via the Finder properties without having to actually open the file in QuickTime. Is this possible? Edit: I seem to have figured this out... you need to use the "System Events" application, specifically the Movie File Suite of commands (and, importantly, you need to set the movie variable as a string, rather than an alias): set theMovie to (choose file with prompt "Select a movie file:") as string tell application "System Events" set theName to name of movie file theMovie set theDuration to (duration of contents of movie file theMovie) / (time scale of contents of movie file theMovie) end tell

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• Function that copies into byte vector reverses values

  - by xeross

  Hey, I've written a function to copy any variable type into a byte vector, however whenever I insert something it gets inserted in reverse. Here's the code. template <class Type> void Packet::copyToByte(Type input, vector<uint8_t>&output) { copy((uint8_t*) &input, ((uint8_t*) &input) + sizeof(Type), back_inserter(output)); } Now whenever I add for example a uint16_t with the value 0x2f1f it gets inserted as 1f 2f instead of the expected 2f 1f. What am I doing wrong here ? Regards, Xeross

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• php foreach visible on page

  - by Hintswen

  In my PHP code I have this: $filename = 'data.xml'; $xml = file_get_contents($filename); $data = simplexml_load_string($xml); $variable = ""; foreach ($data->file_info as $record) { $id1 = $record['id1']; $id2 = $record['id2']; } And it works perfectly fine on the web server, but when trying to view it locally (using xampp) I get the following output at the top of my pgae: file_info as $record) { $id1 = $record['id1']; $id2 = $record['id2']; } (followed by another 100 or so lines of PHP) Not sure if it would make a difference, the web server it works on is running linux, and I am trying to view it on windows using xampp)

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• What's the right way to use idlestartup on python 2.6.5?

  - by user210481

  Idlestartup is analogous to pythonstartup variable, but for IDLE, instead of command line. But it seems not to work properly. I'm using python 2.6.5 on Windows. I have the following script assigned to it: from pprint import pprint import sys newPath = 'C:\\Python26\test') sys.path.append(newPath) print "initial config loaded" Both variables Idlestartup and pythonstartup are assigned to the same file (script above). When running IDLE, pprint and sys are NOT available, the final message is NOT printed, but newPath was added to sys.path. Running the command line, pprint and sys are available, the final message is printed and newPath was added to sys.path. Is it a bug? Am I doing something wrong? Thanks

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• IN R counting hierarchical data

  - by Alison

  I have a list of counties in each state that received nonattainment status in years 1995-2005. I want to know how many counties in each state each year that received this status. If my data is formatted like this, State1 Country1 YR1 Yr2 Yr3 Yr4... State1 Country2 YR1 Yr2 Yr3 Yr4 State2 County1 Yr1 Yr2..... Each year variable could have a 1 or a zero, since a county may gain or loose this status in a time period. I need to count each year how many counties in each state have nonattainment status (YRx=1), but can't think of how to do it.

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• In Ruby, how can I initialize instance variables in new objects of core classes created from literal

  - by Ollie Saunders

  class Object attr_reader :foo def initialize @foo = 'bar' end end Object.new.foo # => 'bar' ''.foo # => nil //.foo # => nil [].foo # => nil I want them all to return 'bar' Am aware that you can do this already: class Object def foo 'bar' end end But I specifically want to initialize a state variable. Also note that this doesn't work. class String alias_method :old_init, :initialize def initialize(*args) super old_init(*args) end end class Object attr_reader :foo def initialize @foo = 'bar' super end end ''.foo # => nil Nor does this: class String attr_reader :foo def initialize @foo = 'bar' end end ''.instance_variables # => [] I'm beginning to think that this isn't actually possible.

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• Linq like or other construction

  - by Yauhen Kavalenka

  I have DB oracle in my solution. I want to have some results in this query. Query example: select * from doctor where doctor.name like '%IVANOV_A%'; But if i do it at LINQ i cannot get any result. from p in repository.Doctor.Where(x => x.Name.ToLower().Containsname)) select p; Where 'name' is variable of string parameter. Web layout request next string: "Ivanov a" or "A Ivanov" But i suggest for user choose you pattetn for query. How i can to get "patient by name" if name consist of "First name" and "Last name" but user doesn't know your doctor's full name?

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• Deep Null checking, is there a better way?

  - by Mattias Konradsson

  We've all been there, we have some deep property like cake.frosting.berries.loader that we need to check if it's null so there's no exception. The way to do is is to use a short-circuiting if statement if (cake != null && cake.frosting != null && cake.frosting.berries != null) ... This strikes me however as not very elegant, there should perhaps be an easier way to check the entire chain and see if it comes up against a null variable/property. So is it possible using some extension method or would it be a language feature, or is it just a bad idea?

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• C# - Convert Implict Type to ObservableCollection

  - by user70192

  Hello, I have a LINQ statement that returns an implicit type. I need to get this type to be an ObservableCollection in my Silverlight 3 application. The ObservableCollection constructor in Silverlight 3 only provides an empty constructor. Because of this, I cannot directly convert my results to an ObservableCollection. Here is my code: ObservableCollection<MyTasks> visibleTasks = e.Result; var filteredResults = from visibleTask in visibleTasks select visibleTask; filteredResults = filteredResults.Where(p => p.DueDate == DateTime.Today); visibleTasks = filteredResults.ToList(); // This throws a compile time error How can I go from an implicitly typed variable to an observable collection? Thank you

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• Cookie: ASP.NET SessionId Issue

  - by LB

  I have a load generator that appends a ASP.NET_SessionId to the Cookie when making a Soap test call from Machine A to Machine B. Cookie: ASP.NET_SessionId=gf0ouay24sdneiuicpiggn45; However, when I'm running the soap test hitting my local server it doesn't have an ASP.NET_Session variable in the cookie. Why is this happening? UPDATE: I'm getting this issue now on the server: Forms authentication failed for the request. Reason: The ticket supplied was invalid. I've followed this: http://msmvps.com/blogs/omar/archive/2006/08/20/108307.aspx But to no avail.

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• Can I assign the value like this?

  - by kumar

  Exactly I ned to do something like this is this possible? <% var Controller = null; if (Model.ID== "ABC") { Controller = "Name"; } else { Controller = "Detail"; } %> <% using (Html.BeginForm("edit", Controller, FormMethod.Post, new { @id="exc-" + Model.SID})) {%> <%= Html.Summary(true)%> is this possible? if i do I am getting exception... ERROR: Cannot assign to an implicitly-typed local variable

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• Two Tables Serving as one Model in Rails

  - by matsko

  Is is possible in rails to setup on model which is dependant on a join from two tables? This would mean that for the the model record to be found/updated/destroyed there would need to be both records in both database tables linked together in a join. The model would just be all the columns of both tables wrapped together which may then be used for the forms and so on. This way when the model gets created/updated it is just one form variable hash that gets applied to the model? Is this possible in Rails 2 or 3?

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• Issues using ivy

  - by Almas

  Hi, I am new bie to ivy. I am using packager resolver and that packager resolver resolves the zip file, unzip it, extracts the jar file from it in temp build file, but it stays temporarily and only the jar file which i specified as a module name gets copied to destination rest of all are ignored. Is there a way i can get all the jar files? I use preseverBuildDirectories but is there a better way to do it? Also is it possible for me to publish an artifact to svn using normal ivy? I got error while i was trying to use ivy 2.1.0 on XP using ant 1.8.0 java.illegalArguementException saying authorization failed. Is there a way i can work through ivy:publish? Is there a way i can use ivy variable in packager.xml? Thanks in advance, Almas

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• JSON Search and remove in php?

  - by moogeek

  Hello! I have a session variable $_SESSION["animals"] containing a deep json object with values: $_SESSION["animals"]='{ "0":{"kind":"mammal","name":"Pussy the Cat","weight":"12kg","age":"5"}, "1":{"kind":"mammal","name":"Roxy the Dog","weight":"25kg","age":"8"}, "2":{"kind":"fish","name":"Piranha the Fish","weight":"1kg","age":"1"}, "3":{"kind":"bird","name":"Einstein the Parrot","weight":"0.5kg","age":"4"}, }'; For example, I want to find the line with "Piranha the Fish" and then remove it (and json_encode it again as it was). How to do this? I guess i need to search in json_decode($_SESSION["animals"],true) resulting array and find the parent key to remove but i'm stucked anyways.

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• Troubleshoot MySQL query

  - by Victor

  I need help with this code, it doesent insert the values to my database. Probably a simple problem but it's late here in Sweden so i would appriciate if someone could have a look at this and tell me what's wrong: include "../../inc/mysql_config.php"; $to = mysql_real_escape_string($_POST['to']); $message = mysql_real_escape_string($_POST['message']); mysql_query("INSERT INTO messages (to, message) VALUES ('".$to."', '".$message."')"); Every variable have an value, double checked that and the mysql_config.php is working.

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• Is there an easy way to convert C# classes to PHP?

  - by John

  I am used to writing C# Windows application. However I have some free hosted PHP web space that I would like to make use of. I have a basic understanding of PHP but have never used it's object oriented capabilities. Is there an easy way to convert C# classes to PHP classes or is it just not possible to write a fully object oriented application in PHP? Update: There are no reliance on the .NET framework beyond the basics. The main aim would be to restructure the class properties, variable enums, etc. The PHP will be hosted on a Linux server.

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• Naming convention in Objective C /C , start with "_"?

  - by Tattat

  Something I see ppl define the variable like this: b2World *_world; b2Body *_body; CCSprite *_ball; instead of b2World *world; b2Body *body; CCSprite *ball; I familiar with the second one, but not the first one. So, I checked the Wikipedia about naming convention: Names beginning with double underscore or an underscore and a capital letter are reserved for implementation (compiler, standard library) and should not be used (e.g. __reserved or _Reserved). So, is that any special meaning which is start with "_"? The wiki page.

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• conditional operator in C question

  - by Seephor

  I just have a quick question about the conditional operator. Still a budding programmer here. I am given x = 1, y = 2, and z = 3. I want to know, why after this statement: y += x-- ? z++ : --z; That y is 5. The values after the statement are x = 0, y = 5, and z = 4. I know the way the conditional operator works is that it is formatted like this: variable = condition ? value if true : value if false. For the condition, y += x-- , how does y become 5? I can only see 2 (2 += 0) and 3 (2 += 1)(then x-- becomes zero) as possibilities. Any help is much appreciated. :)

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• pointer to member function question

  - by Steve

  Hello, I'm trying to replicate a template I've used before with a member function, and it isn't going very well. The basic form of the function is template<class T> T Convert( HRESULT (*Foo)(T*)) { T temp; Foo(&temp); //Throw if HRESULT is a failure return temp; } HRESULT Converter(UINT* val) { *val = 1; return S_OK; } int _tmain(int argc, _TCHAR* argv[]) { std::cout << Convert<UINT>(Converter) << std::endl; return 0; } For the life of me, I can't get this to work with a member variable. I've read up on their syntax, and I can't seem to figure out how to make it work with templates. The class would be something similar to class TestClass { HRESULT Converter(UINT* val) { *val = 1; return S_OK; } }

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• Integer variables at WIX

  - by Hila

  I would like to install a feature according to the brand. So in my brand.wxi I defined: <?define brand.FeatureLevel = 1 ?> And in my wxs I wrote: <Feature Id="FF" Title="FF" Level="$(var.brand.FeatureLevel)"> <ComponentRef Id="..." /> <ComponentRef Id="..." /> </Feature> This definition works fine (wheather I've placed 0 or 1 as FeatureLevel). My only problem is a warning I get at compilation time: The 'Level' attribute is invalid - The value '$(var.brand.FeatureLevel)' is invalid according to its datatype 'http://www.w3.org/2001/XMLSchema:integer' - The string '$(var.brand.FeatureLevel)' is not a valid Integer value. Is there a way to fix this warning? Can I define integer variable? I couldn't find a way...

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• Read tab delimited text file into MySQL table with PHP

  - by Simon S

  I am trying to read in a series of tab delimited text files into existing MySQL tables. The code I have is quite simple: $lines = file("import/file_to_import.txt"); foreach ($lines as $line_num => $line) { if($line_num > 1) { $arr = explode("\t", $line); $sql = sprintf("INSERT INTO my_table VALUES('%s', '%s', '%s', %s, %s);", trim((string)$arr[0]), trim((string)$arr[1]), trim((string)$arr[2]), trim((string)$arr[3]), trim((string)$arr[4])); mysql_query($sql, $database) or die(mysql_error()); } } But no matter what I do (hence the casting before each variable in the sprintf statement) I get the "You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 1" error. I echo out the code, paste it into a MySQL editor and it runs fine, it just won't execute from the PHP script. What am I doing wrong?? Si

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• how to set(get) cookie value in ext.net

  - by user591587

  scene: when I click item in ext:ComboBox and want to set the item selected value to cookie variable. Finally, after I click ext:Button, the ext:Label get cookie value and display it. But I get a error :Ext.Ajax Communication Failure , any help will be appreciated. aspx: <ext:ComboBox ID="ComboBox1" runat="server" StoreID="Store1" Width="100" Editable="false" DisplayField="name" ValueField="value" Mode="Local" TriggerAction="All`enter code here`" EmptyText="Select a locale..."> ..... aspx.cs protected void lngIndexChanged(object sender, DirectEventArgs e) { //Sets the cookie that is to be used by Global.asax HttpCookie cookie = new HttpCookie("CultureInfo"); cookie.Value = ComboBox1.SelectedItem.Value ; Response.Cookies.Add(cookie); Label1.Text = cookie.Value; //Set the culture and reload for immediate effect. //Future effects are handled by Global.asax Thread.CurrentThread.CurrentCulture = new CultureInfo(ComboBox1.SelectedItem.Value); Thread.CurrentThread.CurrentUICulture = new CultureInfo(ComboBox1.SelectedItem.Value); }

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• C functions invoked as threads - Linux userland program

  - by Einar

  I'm writing a linux daemon in C which gets values from an ADC by SPI interface (ioctl). The SPI (spidev - userland) seems to be a bit unstable and freezes the daemon at random times. I need to have some better control of the calls to the functions getting the values, and I was thinking of making it as a thread which I could wait for to finish and get the return value and if it times out assume that it froze and kill it without this new thread taking down the daemon itself. Also I could do other things like resetting the ADC before restarting. Is this possible? Pseudo example of what I want to achieve: (function int get_adc_value(int adc_channel, float *value) ) pid = thread( get_adc_value(1,&value); //makes thread wait_until_finish(pid, timeout); //waits until function finishes/timesout if(timeout) kill pid, start over //if thread do not return in given time, kill it (it is frozen) else if return value sane, continue //if successful, handle return variable value and continue Thanks for any input on the matter, examples highly appreciated!

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