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• Inheritance using prototype / "new"

  - by mikkol

  Hi I'm new in Javascript OO and want to know more about about inheritance. Hope you can provide some advice! I see this great post: How to "properly" create a custom object in JavaScript? which talks about how a class is inherited as I see in other websites, ex.: function man(x) { this.x = x; this.y = 2; } man.prototype.name = "man"; man.prototype.two = function() { this.y = "two"; } function shawn() { man.apply(this, arguments); }; shawn.prototype = new man; The above post claims that in order not to call "man"'s constructor while inheriting, one can use a helper like this instead: function subclassOf(base) { _subclassOf.prototype= base.prototype; return new _subclassOf(); } function _subclassOf() {}; shawn.prototype = subclassOf(man); While I understand its intention, I don't see why we can't call shawn.prototype = man.prototype; I see it works exactly the same. Or is there something I'm missing? Thanks in advance!

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• Correct OOP design without getters?

  - by kane77

  I recently read that getters/setters are evil and I have to say it makes sense, yet when I started learning OOP one of the first things I learned was "Encapsulate your fields" so I learned to create class give it some fields, create getters, setters for them and create constructor where I initialize these fields. And every time some other class needs to manipulate this object (or for instance display it) I pass it the object and it manipulate it using getters/setters. I can see problems with this approach. But how to do it right? For instance displaying/rendering object that is "data" class - let's say Person, that has name and date of birth. Should the class have method for displaying the object where some Renderer would be passed as an argument? Wouldn't that violate principle that class should have only one purpose (in this case store state) so it should not care about presentation of this object. Can you suggest some good resources where best practices in OOP design are presented? I'm planning to start a project in my spare time and I want it to be my learning project in correct OOP design..

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• Asp.net Webdeployment Project override applicationSettings

  - by citronas

  I got a web deyploment project for a web application project in vs 2008. While building the web deployment project, I want to replace properties in the web.config. My settings are autogenrated by the deisgner. <applicationSettings> <NAMESPACE.Properties.Settings> <setting name="Testenvironment" serializeAs="String"> <value>True</value> </setting> </NAMESPACE.Properties.Settings> </applicationSettings> In the config file which contains the settings for the specific server looks like the following: <?xml version="1.0"?> <applicationSettings> <NAMESPACE.Properties.Settings> <setting name="Testenvironment" serializeAs="String"> <value>False</value> </setting> </NAMESPACE.Properties.Settings> </applicationSettings> Sadly, this does not work. I get an error "The format of a configSource file must be an element containing the name of the section" that highlights the second line (2nd example code). How must the Tag be named in order to make evertything work? Edit: Deleting the "applicationSetting"-Tags does not work either.

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• Strange error coming from ActiveRecord (probably)

  - by artemave

  My development environment: Ubuntu 9 Ruby 1.9.1/1.8.7 (rvm) Rails 2.3.5 Mysql 5.0 Apache Passenger Below is the part of the program flow to represent the issue. Request comes: #action def create begin @report = Report.new(params[:report]) ... rescue LocationNotFound => e ... end end Report constructor: class Report attr_accessor :locations def initialize(params = {}) @locations = params[:locations] ? fetch_locations(params[:locations]) : [] end ... end fetch_locations: def fetch_locations(loc_names) Rails.logger.debug "LOC_NAMES: " + loc_names.inspect ls = Location.find(:all, :conditions => [ # line 57 "locations.name in (#{loc_names.map{'?'}.join(',')})", *loc_names ], :include => [:sample_summaries, :samples]) # loc_names will never be empty ... end Location model: class Location < ActiveRecord::Base has_many :sample_summaries has_many :samples, :through => :sample_summaries ... end Now, the first time (after passenger restart) this runs fine and does the job. Most of the consequent times I get the error: Mar-11 11:01:00 #15098 DEBUG: LOC_NAMES: ["Moscow, RF", "London, UK"] Mar-11 11:01:00 #15098 DEBUG: Location Load (0.0ms) SELECT * FROM `locations` WHERE (locations.name in ('Moscow, RF','London, UK')) Mar-11 11:01:00 #15098 DEBUG: SampleSummary Load (0.0ms) SELECT `sample_summaries`.* FROM `sample_summaries` WHERE (`sample_summaries`.location_id IN (1,3)) Mar-11 11:01:00 #15098 DEBUG: SampleSummary Columns (0.0ms) SHOW FIELDS FROM `sample_summaries` Mar-11 11:01:00 #15098 FATAL: NoMethodError (You have a nil object when you didn't expect it! You might have expected an instance of Array. The error occurred while evaluating nil.include?): app/models/report.rb:57:in `fetch_locations' app/models/report.rb:9:in `initialize' app/controllers/report_controller.rb:11:in `new' app/controllers/report_controller.rb:11:in `create' Looks quite random to me. Any ideas? P.S. I also tried to wrap the query in uncached block, but that didn't change anything. EDIT Here is what SampleSummary model looks like: class SampleSummary < ActiveRecord::Base has_many :samples belongs_to :location ... #validations default_scope :include => :samples, :order => 'rss_ts desc' ... end

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• Problem Binding a ObservableCollection to a ListBox in WPF/MVVM

  - by alexqs

  I'm working in some code , using wpf and starting to use mvvm. So far i have no problem, when i have one element and I have to show the values of it in the screen (binding of the specific name of the property). But now, i have to work with a property list , not knowing the names of it. So I created a class, named GClass, that only have two propierties, name and value. I created the ObservableCollection, and fill for now with direct values, and asign the view (lstview) datacontext with the object i have created. But I cant see any result, it always shows a blank listbox. Can someone tell me if see why is happening ? Code of c# VDt = new ObservableCollection<GClass>(); var vhDt = message.SelectSingleElement(typeof (Vh)) as Vehiculo; if(vhDt != null) { VDt.Add(new GClass() {Name = "Numero: ", Value = ""}); VDt.Add(new GClass() {Name = "Marca: ", Value = ""}); VDt.Add(new GClass() {Name = "Conductor: ", Value = ""}); lstview.DataContext = this; _regionManager.RegisterViewWithRegionInIndex(RegionNames.MainRegion, lstview, 0); Code of the view <ListBox Margin="5,5,5,25" ItemsSource="{Binding VDt}"> <ListBox.Template> <ControlTemplate> <ListViewItem Content="{Binding Name}"></ListViewItem> <ListViewItem Content="{Binding Value}"></ListViewItem> </ControlTemplate> </ListBox.Template> </ListBox> I have research here, but i cant see, what I'm doing wrong. I will apreciate if someone help me.

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• Why can't c# use inline anonymous lambdas or delegates?

  - by Samuel Meacham

  I hope I worded the title of my question appropriately. In c# I can use lambdas (as delegates), or the older delegate syntax to do this: Func<string> fnHello = () => "hello"; Console.WriteLine(fnHello()); Func<string> fnHello2 = delegate() { return "hello 2"; }; Console.WriteLine(fnHello2()); So why can't I "inline" the lambda or the delegate body, and avoid capturing it in a named variable (making it anonymous)? // Inline anonymous lambda not allowed Console.WriteLine( (() => "hello inline lambda")() ); // Inline anonymous delegate not allowed Console.WriteLine( (delegate() { return "hello inline delegate"; })() ); An example that works in javascript (just for comparison) is: alert( (function(){ return "hello inline anonymous function from javascript"; })() ); Which produces the expected alert box. UPDATE: It seems you can have an inline anonymous lambda in C#, if you cast appropriately, but the amount of ()'s starts to make it unruly. // Inline anonymous lambda with appropriate cast IS allowed Console.WriteLine( ((Func<string>)(() => "hello inline anonymous lambda"))() ); Perhaps the compiler can't infer the sig of the anonymous delegate to know which Console.WriteLine() you're trying to call? Does anyone know why this specific cast is required?

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• Django 1.4.1 error loading MySQLdb module when attempting 'python manage.py shell'

  - by Paul

  I am trying to set up MySQL, and can't seem to be able to enter the Django manage.py shell interpreter. Getting the output below: rrdhcp-10-32-44-126:django pavelfage$ python manage.py shell Traceback (most recent call last): File "manage.py", line 10, in <module> execute_from_command_line(sys.argv) File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/django/core/management/__init__.py", line 443, in execute_from_command_line utility.execute() File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/django/core/management/__init__.py", line 382, in execute self.fetch_command(subcommand).run_from_argv(self.argv) File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/django/core/management/base.py", line 196, in run_from_argv self.execute(*args, **options.__dict__) File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/django/core/management/base.py", line 232, in execute output = self.handle(*args, **options) File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/django/core/management/base.py", line 371, in handle return self.handle_noargs(**options) File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/django/core/management/commands/shell.py", line 45, in handle_noargs from django.db.models.loading import get_models File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/django/db/__init__.py", line 40, in <module> backend = load_backend(connection.settings_dict['ENGINE']) File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/django/db/__init__.py", line 34, in __getattr__ return getattr(connections[DEFAULT_DB_ALIAS], item) File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/django/db/utils.py", line 92, in __getitem__ backend = load_backend(db['ENGINE']) File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/django/db/utils.py", line 24, in load_backend return import_module('.base', backend_name) File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/django/utils/importlib.py", line 35, in import_module __import__(name) File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/django/db/backends/mysql/base.py", line 16, in <module> raise ImproperlyConfigured("Error loading MySQLdb module: %s" % e) django.core.exceptions.ImproperlyConfigured: Error loading MySQLdb module: No module named _mysql Any suggestions really appreciated.

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• Select the Initial Text in a Silverlight TextBox

  - by Dan Auclair

  I am trying to figure out the best way to select all the text in a TextBox the first time the control is loaded. I am using the MVVM pattern, so I am using two-way binding for the Text property of the TextBox to a string on my ViewModel. I am using this TextBox to "rename" something that already has a name, so I would like to select the old name when the control loads so it can easily be deleted and renamed. The initial text (old name) is populated by setting it in my ViewModel, and it is then reflected in the TextBox after the data binding completes. What I would really like to do is something like this: <TextBox x:Name="NameTextBox" Text="{Binding NameViewModelProperty, Mode=TwoWay}" SelectedText="{Binding NameViewModelProperty, Mode=OneTime}" /> Basically just use the entire text as the SelectedText with OneTime binding. However, that does not work since the SelectedText is not a DependencyProperty. I am not completely against adding the selection code in the code-behind of my view, but my problem in that case is determining when the initial text binding has completed. The TextBox always starts empty, so it can not be done in the constructor. The TextChanged event only seems to fire when a user enters new text, not when the text is changed from the initial binding of the ViewModel. Any ideas are greatly appreciated!

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• WCF, ASMX Basic HTTP binding and IIS

  - by Brennan Mann

  Hello, I have been doing a lot of work with WCF "self" hosted applications. I recently was requested to write a web service where the calling client was a Linux based program named "WGET". I would like to use WCF instead of a traditional ASMX web service. The web service is returning a standard XML response. I am not sure of the underlining details between the two technologies but I know WCF is the proper route. I created a WCF service to be hosted in IIS ( using basicHttpBinding). 1.) Did classic ASMX web services ( standard HTTP POST/GET) use SOAP to return responses? I created an class from XSD for the web service response. What is really going on behind the scenes? Is there just special XML HTTP headers that know how to handle to response? Is the response not wrapped in SOAP? The traditional ASMX web service worked perfectly with the class I generated using the .Net "XSD" program. 2.) I want to use WCF for this service. Will using basicHttpBinding work? As I have read, that is the correct binding to use for ASMX clients. Does this use SOAP, standard HTTP headers, or something else? 3.) This is a dumb question because I have not done a lot of web service programming. I noticed on the ASMX default landing page there were examples for responses and code to invoke the functionality. When I create the same service using WCF, I had to create a client application to perform these tasks. Is there a way to expose the WCF endpoint like a classic ASMX service or is the WSDL the only route? As always, I really appreciate the feedback. Thanks, Brennan

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• json-framework: EXC_BAD_ACCESS on stringWithObject

  - by Vegar

  UPDATE: I found that the reason for the previous error was an error in the documentation. The method should be named proxyForJson, not jsonProxyObject... But I'm still stuck, though. I now get an EXC_BAD_ACCESS error inside stringWithObject some where. Any clues? UPDATE 2: My proxyForJson implementation is a cut-n-paste from then documentation: - (id)proxyForJson { return [NSDictionary dictionaryWithObjectsAndKeys: Navn, @"Navn", Adresse, @"Adresse", Alder, @"Alder", nil]; } Trying to make json serialization work for my custom objective-c class. As I understand the documentation, json-framework can serialize custom objects, if they implement the jsonProxyObject method. So I have this class: @interface MyObject : NSObject { NSString *Name; NSString *Addresse; NSInteger Age; } @property (nonatomic, retain) NSString *Name; @property (nonatomic, retain) NSString *Addresse; @property (nonatomic, assign) NSInteger Age; - (id)jsonProxyObject; @end And I try to serialize an array with some instances in it: [json stringWithObject:list error:&error]; But all I get is he following error: "JSON serialisation not supported for MyObject" I guess the jsonWriter can't find my jsonProxyObject method for some reason, buy why? Regards.

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• Mark duplicates in MySql with php (without deleting)

  - by Adam

  So, I'm having some problems with a MySQL query (see other question), and decided to try a different approach. I have a database table with some duplicate rows, which I actually might need for future reference, so I don't want to remove. What I'm looking for is a way to display the data without those duplicates, but without removing them. I can't use a simple select query (as described in the other question). So what I need to do is write a code that does the following: 1. Go through my db Table. 2. Spot duplicates in the "ip" column. 3. Mark the first instance of each duplicate with "0" (in a column named "duplicate") and the rest with "1". This way I can later SELECT only the rows WHERE duplicate=0. NOTE: If your solution is related to the SELECT query, please read this other question first - there's a reason I'm not just using GROUP BY / DISTINCT. Thanks in advance.

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• Problem with non blocking fifo in bash

  - by timdel

  Hi! I'm running a few Team Fortress 2 servers and I want to write a little management script. Basically the TF2 servers are a fg process which provides a server console, so I can start the server, type status and get an answer from it: ***@purple:~/tf2$ ./start_server_testing Auto detecting CPU Using AMD Optimised binary. Server will auto-restart if there is a crash. Console initialized. [bla bla bla] Connection to Steam servers successful. VAC secure mode is activated. status hostname: Team Fortress version : 1.0.6.1/15 3883 secure udp/ip : ***.***.133.31:27600 map : ctf_2fort at: 0 x, 0 y, 0 z players : 0 (2 max) # userid name uniqueid connected ping loss state adr Great, now I want to create a script which sends the command sm_reloadadmins to all my servers. The best way I found to do this is using a fifo named pipe. Now what I want to do is having this pipe readonly and non blocking to the server process, so I can write into the pipe and the server executes it, but still I want to write via console one the server, so if I switch back to the fg process of the server and I type status I want an answer printed. I tried this (assuming serverfifo is mkfifo serverfifo): ./start_server_testing < serverfifo Not working, the server won't start until something is written to the pipe. ./start_server_testing <> serverfifo Thats actually working pretty good, I can see the console output of the server and I can write to the fifo and the server executes the commands, but I can't write via console to the server anymore. Also, if I write 'exit' to the pipe (which should end the server) and I'm running it in a screen the screen window is getting killed for some reason (wtf why?). I only need the server to read the fifo without blocking AND all my keyboard input on the server itself should be send to the server AND all server ouput should be written to the console. Is that possible? If yes, how?

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• Convert text files to excel files using python

  - by Rahim Jaafar

  I am working on INFORMIX 4GL programs. That programs produce output text files.This is an example of the output: Lot No|Purchaser name|Billing|Payment|Deposit|Balance| J1006|JAUHARI BIN HAMIDI|5285.05|4923.25|0.00|361.80| J1007|LEE, CHIA-JUI AKA LEE, ANDREW J. R.|5366.15|5313.70|0.00|52.45| J1008|NAZRIN ANEEZA BINTI NAZARUDDIN|5669.55|5365.30|0.00|304.25| J1009|YAZID LUTFI BIN AHMAD LUTFI|3180.05|3022.30|0.00|157.75| This text files can manually convert to excel files.But, I wanna ask, is there any script that I can use to convert .txt files to .xls files ? Hi all,now I'm already can convert text files to excell file by python using script that was given from user named Rami Helmy.A big thanks for him.But now,That script will produce more than one excell files depends on the number of '|' from the text files.Beside that,That script also can only convert one text files.I a going to convert all text files without state the name of text files.Therefore,I am looking such a way on how to this script going to: output only one excell file convert all .txt files from the directory that was given from user. output excell's file name are automaticly copied from the file name of text files. I am new in python,hopefully someone can help me to solve my problems.Thank You.. done all the task,but there was something that I'm confused.. that output excell files contains an "square" symbol like this: then, how can I ensure that there is no square symbol like that after I convert from text files to excell? thank you...

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• Bind to a method in WPF?

  - by Cameron MacFarland

  How do you bind to an objects method in this scenario in WPF? public class RootObject { public string Name { get; } public ObservableCollection<ChildObject> GetChildren() {...} } public class ChildObject { public string Name { get; } } XAML: <TreeView ItemsSource="some list of RootObjects"> <TreeView.Resources> <HierarchicalDataTemplate DataType="{x:Type data:RootObject}" ItemsSource="???"> <TextBlock Text="{Binding Path=Name}" /> </HierarchicalDataTemplate> <HierarchicalDataTemplate DataType="{x:Type data:ChildObject}"> <TextBlock Text="{Binding Path=Name}" /> </HierarchicalDataTemplate> </TreeView.Resources> </TreeView> Here I want to bind to the GetChildren method on each RootObject of the tree. EDIT Binding to an ObjectDataProvider doesn't seem to work because I'm binding to a list of items, and the ObjectDataProvider needs either a static method, or it creates it's own instance and uses that. For example, using Matt's answer I get: System.Windows.Data Error: 33 : ObjectDataProvider cannot create object; Type='RootObject'; Error='Wrong parameters for constructor.' System.Windows.Data Error: 34 : ObjectDataProvider: Failure trying to invoke method on type; Method='GetChildren'; Type='RootObject'; Error='The specified member cannot be invoked on target.' TargetException:'System.Reflection.TargetException: Non-static method requires a target.

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• Problems with zend-tool reporting that providers are not valid

  - by Mario

  I have recently setup XAMPP 1.7.3 and ZendFramework 1.10.4 on a new computer and many of the commands that I normally use now fail. Here are the steps I used to setup and test ZF. First I added the ZF library folder (C:\xampp\php\ZendFramework-1.10.4\library) to the include path in php.ini. Then I added the ZF bin folder (C:\xampp\php\ZendFramework-1.10.4\bin) to my Path system variable. To test that everything is configured correctly I ran the command "zf show version" from the command line. The result is "Zend Framework Version: 1.9.6". Immediately something appears to be wrong. The file that is downloaded is "ZendFramework-1.10.4.zip" and the reported version is 1.9.6. I have re-downloaded the latest version (1.10.4) and removed old copy. Still the incorrect version number problem persisted. Having done some research there is a bug in the ZF knowledgebase that version 1.10.3 reports a wrong version number. So that may explain the version number problem. Moving forward I tried to run some zf-tool commands and certain commands reports that the action or provider is not valid. Example: C:\xampp\htdocs>zf create project test Creating project at C:/xampp/htdocs/test C:\xampp\htdocs>cd test C:\xampp\htdocs\test>zf create controller Test Creating a controller at C:\xampp\htdocs\test/application/controllers/TestController.php ... Updating project profile 'C:\xampp\htdocs\test/.zfproject.xml' C:\xampp\htdocs\test>zf create action test Test Creating an action named test inside controller at C:\xampp\htdocs\test/application/controllers/TestController.php ... Updating project profile 'C:\xampp\htdocs\test/.zfproject.xml' C:\xampp\htdocs\test>zf enable layout An Error Has Occurred Action 'enable' is not a valid action. ... C:\xampp\htdocs\test>zf create form Test An Error Has Occurred Provider 'form' is not a valid provider. ... Can any one provide insight into these errors and how to correct them?

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• Problems with ltk (common lisp)

  - by Silvanus

  I installed ltk to Steel Bank Common Lisp with asdf-install, but I can't even start using it V_V. The code below is the simplest example in the documentation, and is copied almost verbatim. asdf:operate 'asdf:load-op :ltk) (defun hello-1() (with-ltk () (let ((b (make-instance 'button :master nil :text "Press Me" :command (lambda () (format t "Hello World!~&"))))) (pack b)))) (hello-1) This is the error message I get from sbcl: ; in: LAMBDA NIL ; (PACK B) ; ; caught STYLE-WARNING: ; undefined function: PACK ; (WITH-LTK NIL ; (LET ((B (MAKE-INSTANCE 'BUTTON :MASTER NIL :TEXT "Press Me" :COMMAND #))) ; (PACK B))) ; ; caught STYLE-WARNING: ; undefined function: WITH-LTK ; ; compilation unit finished ; Undefined functions: ; PACK WITH-LTK ; caught 2 STYLE-WARNING conditions debugger invoked on a SIMPLE-ERROR in thread #: There is no class named BUTTON. Type HELP for debugger help, or (SB-EXT:QUIT) to exit from SBCL. restarts (invokable by number or by possibly-abbreviated name): 0: [ABORT] Exit debugger, returning to top level. (SB-PCL::FIND-CLASS-FROM-CELL BUTTON NIL T)

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• Using jQuery, setting Draggable on an element prevents blur from firing when you click the draggable

  - by Danno

  Using jQuery, when you set a blur event on a text box and set another element as draggable, when you click the draggable element, the blur event does not fire in FireFox. IE is a little better, you get the blur event but you don't get the click event on the draggable element. If you don't specify the cancel: "" in the draggable constructor, you will get the blur event to fire, but then the element you want to drag is not draggable. jQuery v1.3.2 jQuery UI v1.7.2 The console.log lines are for FireFox's FireBug plugin. <HTML> <HEAD> <TITLE>Blur/Click Workbench</TITLE> <script src="js/jquery.js" type="text/javascript" ></script> <script src="js/ui/ui.core.js" type="text/javascript"></script> <script src="js/ui/ui.draggable.js" type="text/javascript"></script> <script type="text/javascript"> function blurring() { console.log('1 - blurring - ' + $( this ).attr('id')); } function clicking() { console.log('2 - clicking - ' + $( this ).attr('id')); } $(document).ready(function() { $( ".draggableTool" ).draggable( { cancel: "" } ); $( '.property' ).blur( blurring ); $( '#labelContainer' ).click( clicking ); }); </script> </HEAD> <BODY> <input type='text' class='property' id='tb1' /> <br /> <input type='text' class='property' id='tb2' /> <br /> <label class='draggableTool' id='labelContainer' style='height:20px;position:absolute;'> <textarea id='taLabel' style='height:100%;background-color:white;border:1px solid grey;'>Label</textarea> </label> </BODY> </HTML>

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• Scapy Installed, when i use it as module Its full of errors ???

  - by Rami Jarrar

  I installed scapy 2.xx (after get some missed modules to make it install),, then i'm trying to use it as module in my python programs,, but i cant it give me alot of errors, I download and installed some missed modules and finally i'm depressed, because this error, after hard work i got this Traceback (most recent call last): File "<pyshell#0>", line 1, in <module> from scapy.all import * File "C:\Python26\scapy\all.py", line 43, in <module> from crypto.cert import * File "C:\Python26\scapy\crypto\cert.py", line 15, in <module> from Crypto.PublicKey import * File "C:\Python26\lib\Crypto\PublicKey\RSA.py", line 34, in <module> from Crypto import Random File "C:\Python26\lib\Crypto\Random\__init__.py", line 29, in <module> import _UserFriendlyRNG File "C:\Python26\lib\Crypto\Random\_UserFriendlyRNG.py", line 36, in <module> from Crypto.Random.Fortuna import FortunaAccumulator File "C:\Python26\lib\Crypto\Random\Fortuna\FortunaAccumulator.py", line 36, in <module> import FortunaGenerator File "C:\Python26\lib\Crypto\Random\Fortuna\FortunaGenerator.py", line 32, in <module> from Crypto.Util import Counter File "C:\Python26\lib\Crypto\Util\Counter.py", line 27, in <module> import _counter ImportError: No module named _counter by do the following code: from scapy.all import * p=sr1(IP(dst=ip_dst)/ICMP()) if p: p.show() so what should i do,, is there a solution for this ???

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• Is it possible to handle User Defined Exception using JAX WS Dispatch API ?

  - by snowflake

  Hello, I'm performing dynamic webservices call using following code snippet: JAXBContext jc = getJAXBContext(requestClass, responseClass, jaxbContextExtraClasses); Dispatch<Object> dispatch = service.createDispatch(portQName, jc, Service.Mode.PAYLOAD); Object requestValue = getRequestValue(requestClass, pOrderedParameters); JAXBElement<?> request = new JAXBElement(new QName(serviceQNameStr, pOperationName), requestValue.getClass(), null, requestValue); Object tmpResponse = dispatch.invoke(request); Invocation works perfectly, except if I add a user defined exception on the service (a basic UserException extends java.lang.Exception). First I get: javax.xml.bind.UnmarshalException: unexpected element (uri:"http://schemas.xmlsoap.org/soap/envelope/", local:"Fault"). Expected elements are <{http://my.namespace/}myMethod,<{http://my.namespace/}myResponse Then I added the UserException_Exception JAX-WS generated type to my JAXB Context, and then get: Caused by: com.sun.xml.bind.v2.runtime.IllegalAnnotationsException: 1 counts of IllegalAnnotationExceptions java.lang.StackTraceElement does not have a no-arg default constructor. this problem is related to the following location: at java.lang.StackTraceElement at public java.lang.StackTraceElement[] java.lang.Throwable.getStackTrace() at java.lang.Throwable at java.lang.Exception Only solution available I found are: dispatch directly a Soap message and handle Soap fault directly (this is the way Jboss JAX-WS implementation performs a standard JAX-WS call using services interfaces). This is not an available solution for me, I want to use a high level implementation (the more I get close to Soap message the less dynamic my code can be) usage of JAXBRIContext.ANNOTATION_READER, which is implementation specific and not an available solution for me, in order to annotate annotates java.lang.Exception as @XmlTransient The service with a user defined exception performs well using the JAX-WS generated standard client stubs and using a tool such Soap UI. Problem occurs in deserialization of the message when I have no user defined exception artifact in the JAXB context, and during invocation when I add those non JAXB compatible artifacts in the JAXB context. I'm usign Jboss WS webservice stack within Jboss 4.2.3.GA Any elegant solution to this problem is welcomed !

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• How do I securely authenticate the calling assembly of a WCF service method?

  - by Tim

  The current situation is as follows: We have an production .net 3.5 WCF service, used by several applications throughout the organization, over wsHttpBinding or netTcpBinding. User authentication is being done on the Transport level, using Windows integrated security. This service has a method Foo(string parameter), which can only be called by members of given AD groups. The string parameter is obligatory. A new client application has come into play (.net 3.5, C# console app), which eliminates the necessity of the string parameter. However, only calls from this particular application should be allowed to omit the string parameter. The identity of the caller of the client application should still be known by the server because the AD group limitation still applies (ruling out impersonation on the client side). I found a way to pass on the "evidence" of the calling (strong-named) assembly in the message headers, but this method is clearly not secure because the "evidence" can easily be spoofed. Also, CAS (code access security) seems like a possible solution, but I can't seem to figure out how to make use of CAS in this particular scenario. Does anyone have a suggestion on how to solve this issue? Edit: I found another thread on this subject; apparently the conclusion there is that it is simply impossible to implement in a secure fashion.

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• What's the strangest corner case you've seen in C# or .NET?

  - by Jon Skeet

  I collect a few corner cases and brain teasers and would always like to hear more. The page only really covers C# language bits and bobs, but I also find core .NET things interesting too. For example, here's one which isn't on the page, but which I find incredible: string x = new string(new char[0]); string y = new string(new char[0]); Console.WriteLine(object.ReferenceEquals(x, y)); I'd expect that to print False - after all, "new" (with a reference type) always creates a new object, doesn't it? The specs for both C# and the CLI indicate that it should. Well, not in this particular case. It prints True, and has done on every version of the framework I've tested it with. (I haven't tried it on Mono, admittedly...) Just to be clear, this is only an example of the kind of thing I'm looking for - I wasn't particularly looking for discussion/explanation of this oddity. (It's not the same as normal string interning; in particular, string interning doesn't normally happen when a constructor is called.) I was really asking for similar odd behaviour. Any other gems lurking out there?

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• Simulate Windows Service with ASP.NET

  - by Bayonian

  Hi, I have small web app that generate PDF files as a report. I'm trying to delete those generated PDF files after 10 sec that they are generated. What I want to do is to read a folder with PDF files every 10 sec, and delete all the PDF files inside that folder. I read this post of Easy Background Tasks in ASP.NET. The following code is the VB version. Protected Sub Application_Start(ByVal sender As Object, ByVal e As EventArgs) AddTask("DoStuff", 10) End Sub Private Sub AddTask(ByVal name As String, ByVal seconds As Integer) OnCacheRemove = New CacheItemRemovedCallback(CacheItemRemoved) HttpRuntime.Cache.Insert(name, seconds, Nothing, DateTime.Now.AddSeconds(seconds), Cache.NoSlidingExpiration, CacheItemPriority.NotRemovable, _ OnCacheRemove) End Sub Public Sub CacheItemRemoved(ByVal k As String, ByVal v As Object, ByVal r As CacheItemRemovedReason) ' do stuff here if it matches our taskname, like WebRequest DeletePDFilesInFoler() ' re-add our task so it recurs AddTask(k, Convert.ToInt32(v)) End Sub But I got this error Delegate 'System.Web.Caching.CacheItemRemovedCallback' requires an 'AddressOf' expression or lambda expression as the only argument to its constructor. If this code works, where I should put it. Right, now I'm putting it in the master page. How to get this error out? Thank you

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• Zend Framework: How to start PHPUnit testing Forms?

  - by Andrew

  I am having trouble getting my filters/validators to work correctly on my form, so I want to create a Unit test to verify that the data I am submitting to my form is being filtered and validated correctly. I started by auto-generating a PHPUnit test in Zend Studio, which gives me this: <?php require_once 'PHPUnit/Framework/TestCase.php'; /** * Form_Event test case. */ class Form_EventTest extends PHPUnit_Framework_TestCase { /** * @var Form_Event */ private $Form_Event; /** * Prepares the environment before running a test. */ protected function setUp () { parent::setUp(); // TODO Auto-generated Form_EventTest::setUp() $this->Form_Event = new Form_Event(/* parameters */); } /** * Cleans up the environment after running a test. */ protected function tearDown () { // TODO Auto-generated Form_EventTest::tearDown() $this->Form_Event = null; parent::tearDown(); } /** * Constructs the test case. */ public function __construct () { // TODO Auto-generated constructor } /** * Tests Form_Event->init() */ public function testInit () { // TODO Auto-generated Form_EventTest->testInit() $this->markTestIncomplete( "init test not implemented"); $this->Form_Event->init(/* parameters */); } /** * Tests Form_Event->getFormattedMessages() */ public function testGetFormattedMessages () { // TODO Auto-generated Form_EventTest->testGetFormattedMessages() $this->markTestIncomplete( "getFormattedMessages test not implemented"); $this->Form_Event->getFormattedMessages(/* parameters */); } } so then I open up terminal, navigate to the directory, and try to run the test: $ cd my_app/tests/unit/application/forms $ phpunit EventTest.php Fatal error: Class 'Form_Event' not found in .../tests/unit/application/forms/EventTest.php on line 19 So then I add a require_once at the top to include my Form class and try it again. Now it says it can't find another class. I include that one and try it again. Then it says it can't find another class, and another class, and so on. I have all of these dependencies on all these other Zend_Form classes. What should I do? How should I go about testing my Form to make sure my Validators and Filters are being attached correctly, and that it's doing what I expect it to do. Or am I thinking about this the wrong way?

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• Load external script dynamic, and access it, so I can trigger its domready function

  - by Didier

  I am trying to load the Zopim chat client. Normally it is included with a document write action. This causes it to be loaded before the domReady function is triggered, as it needs this to start itself. I want to load it later, and this works by using prototype (framework determined by Magento) to create a new script element and attaching it to the head. The script is loaded perfectly, but the domReady doesn't fire, so the script is never started. The script is a nameless class, by this I mean that all its functions are encapsulated in {} UPDATE: Sorry, I got it wrong, it is as self invoking function, the same syntax as the first answer suggest. (function C(){ })(); This function call when run sets up listening events for the domReady event under various browsers and then waits. When the domready event fires, it calls a function (that is within the self-invoked function) that starts everything. What I need, is a way to access this function somehow. END UPDATE Within that is a function named C. How can I call this function directly? Or put another way, how can I start an external javascript file that depends on domready going off, when that event doesn't happen? Can I load an external javascript file into a variable, so I can name the class? Can I access the nameless class {} somehow maybe via the script tag? Is there a way to alter the external file/javascript so I can have it look for another event, one that I can trigger? About the only solution I can think of at the moment is to create a iframe and load the script in that.

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• git branch naming best practices

  - by skiphoppy

  I've been using a local git repository interacting with my group's CVS repository for several months, now. I've made an almost neurotic number of branches, most of which have thankfully merged back into my trunk. But naming is starting to become an issue. If I have a task easily named with a simple label, but I accomplish it in three stages which each include their own branch and merge situation, then I can repeat the branch name each time, but that makes the history a little confusing. If I get more specific in the names, with a separate description for each stage, then the branch names start to get long and unwieldy. I did learn looking through old threads here that I could start naming branches with a / in the name, i.e., topic/task, or something like that. I may start doing that and seeing if it helps keep things better organized. What are some best practices for naming git branches? Edit: Nobody has actually suggested any naming conventions. I do delete branches when I'm done with them. I just happen to have several around due to management constantly adjusting my priorities. :) As an example of why I might need more than one branch on a task, suppose I need to commit the first discrete milestone in the task to the group's CVS repository. At that point, due to my imperfect interaction with CVS, I would perform that commit and then kill that branch. (I've seen too much weirdness interacting with CVS if I try to continue to use the same branch at that point.)

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