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  • .NET Expression Trees Tutorial

    - by zoman
    I've been looking for a good tutorial on Expression trees (C#) for a while, but no luck so far. Most of the stuff I've found on the Web was too high level and very basic. Does anyone know some decent tutorial that goes beyond the fundamentals?

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  • GWTAI applet integration in GWT problem

    - by andy
    Hi everybody. I'm working with gwtai to integrate a java applet into my gwt - project. Basic communication from my main application to the applet (such as invoking simple methods that return int or boolean values) works. But the main reason why I need to integrate this applet is, that I need it to connect to another server and receive a answer and pass it to my gwt-application. So there's one basic method in the applet: public String SendAndReceive(String host, int sendPort, int receivePort, String query) that connects to the server, receives an answer and returns this answer as a string. When I now try to invoke this method like this: applet.SendAndReceive("0.0.0.0", 9099, 2000, "show streams;"); I constantly run into following error (full error message at the end): com.google.gwt.core.client.JavaScriptException: (String): Error calling method on NPObject! [plugin exception: java.security.AccessControlException: access denied (java.util.PropertyPermission * read,write)] I couldn't find a solution (for gwtai is a quite uncommon topic), what I found out (and what the Exception let's one assume) is, that there's a security problem - maybe because I'm connecting to another server. I also read something about browser's Single Origin Policy, what would point in the same direction...up to now I have never worked with java applets. So if someone has a solution or a hint I would be very thankful. If more code is helpful I can give. Thanks, Andy the full error message: 21:03:49.864 [ERROR] [follovizergwt] Unable to load module entry point class follovizer.gwt.client.FolloVizerGWT (see associated exception for details) com.google.gwt.core.client.JavaScriptException: (String): Error calling method on NPObject! [plugin exception: java.security.AccessControlException: access denied (java.util.PropertyPermission * read,write)]. at com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascript(BrowserChannelServer.java:195) at com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke(ModuleSpaceOOPHM.java:120) at com.google.gwt.dev.shell.ModuleSpace.invokeNative(ModuleSpace.java:507) at com.google.gwt.dev.shell.ModuleSpace.invokeNativeObject(ModuleSpace.java:264) at com.google.gwt.dev.shell.JavaScriptHost.invokeNativeObject(JavaScriptHost.java:91) at follovizer.gwt.client.AnduINAppletImpl.SendAndReceive(AnduINAppletImpl.java) at follovizer.gwt.client.FolloVizerGWT.createLayout(FolloVizerGWT.java:92) at follovizer.gwt.client.FolloVizerGWT.onModuleLoad(FolloVizerGWT.java:40) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at com.google.gwt.dev.shell.ModuleSpace.onLoad(ModuleSpace.java:369) at com.google.gwt.dev.shell.OophmSessionHandler.loadModule(OophmSessionHandler.java:185) at com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:380) at com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:222) at java.lang.Thread.run(Thread.java:619)

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  • vb.net A first chance exception of type 'System.Runtime.InteropServices.COMException' occurred in ms

    - by prasoon99
    I just installed Visual Basic 2010 Express. I created a simple console application: Module Module1 Sub Main() Dim i As Integer i = 0 End Sub End Module I'm getting the following error SIX times before I get to line "i = 0": A first chance exception of type 'System.Runtime.InteropServices.COMException' occurred in mscorlib.dll Can anyone help? Why is this happening? Is there something wrong with my configuration? -Prasoon

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  • Generate a form from an untyped mvc 2 model or dictionary

    - by user329251
    HI all, I am looking for a way to generate and validate mvc 2 forms using untyped entities. Basically similar how the propertygrid in winforms behaves. In the utmost basic sample for instance have an dictionary and generate a form from that depending on the datatype in the Dictionary ofcourse it should be able to fill the same dictionary in the controller. Any ideas or leads or hints? Best regards, Emile

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  • GNUStep Getting Started

    - by RCIX
    I downloaded GNUStep and installed it, however i am not sure where i can find an IDE. does anyone know what programs serve as a GNUStep IDE/where to get them? Failing that, does anyone know of a tutorial on how to create and compile a basic GNUStep program?

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  • fork() in perl on windows

    - by Darioush
    I'm using fork() on PERL in windows (activeperl) for a basic socket server, but apparently there are problems (it won't accept connections after a few times), is there any workaround? while($client = $bind->accept()) { $client->autoflush(); if(fork()){ $client->close(); } else { $bind->close(); new_client($client); exit(); } } is the portion of the relevant code.

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  • WPF Timeline Control

    - by Sam Tr
    Hi, I am looking for a WPF Timeline User Control. I have checked out Blendables Timeline and Animated Timeline control from IdentityMine, but it is rather basic and buggy. I am looking for a timeline control that is similar to the MIT Similie timeline. http://www.simile-widgets.org/timeline/ What i need to be able to do is add interactive objects to the timeline, for example video, images, etc. Any ideas? Cheers

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  • CATiled Layer Question~

    - by Zee
    Hi guys, Was wondering how to apply the CATiled Layer to a webView rather than a scrollView. Went through a lot of books as well as searches and found absolutely nothing regarding how to successfully apply a CATiled Layer to a webView. The basic functionality is to make the website rendering smoother on a webView. I'd really appreciate if someone could provide their insight regarding this. Thanks, -Zee-

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  • How to arrange models, views, controllers in a Kohana 3 project

    - by Pekka
    I'm looking at how to set up a mid-sized web application with Kohana 3. I have implemented MVC patterns in the past but never worked against a "formalized" MVC framework so I'm still getting my head around the terminology - toying around with basic examples, building views and templates, and so on. I'm progressing fairly well but I want to set up a real-world web project (one of my own that I've been planning for quite some time now) as a learning object. I learn best by example, but example-based documentation is a bit sparse for Kohana 3 right now - they say so themselves on the site. While I'm not worried about getting into the framework soon enough, I'm a bit concerned about arranging a healthily structured code base from the start - i.e. how to split up controllers, how to name them, and how to separate the functionality into the appropriate models. My application could, in its core, be described as a business directory with a main businesses table. Businesses can be listed by category and by street name. Each business has a detail page. Business owners can log in and edit their business's entry. Businesses can post offers into an offers table. I know this is not very detailed, but I don't want to cram too much information into this question. I'll be more than happy to go into more detail if needed. Supposing I have all the basic functionality worked out and in place already - list all businesses, edit business, list businesses by street name, create offer logged in as business, and so on, and I'm just looking for how to fit the functionality into a MVC pattern and into a Kohana application structure that can be easily extended: Do you know real-life, publicly accessible examples of "database-heavy" applications like directories, online communities... with a log-in area built on Kohana 3 where I could take a peek how they do it? Are there conventions or best practices on how to structure an extendable login area for end users in a Kohana project that is not only able to handle a business directory page, but further products on separate pages as well? Do you know application structuring HOWTOs or best practices for Kohana 3 not mentioned in the user guide and the inofficial Wiki? Have you built something similar and could give me some recommendations?

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  • Youtube video processing on iPhone

    - by Chonch
    Hey In my iPhone app, I want to load a video from youtube, perform some basic image processing on it and display it to the user. I am using openCV to do my image processing, and I know I can use it for grabbing all of the frames from the video as well (cvRetrieveFrame). My only problem is that cvRetrieveFrame expects to get its source of type CvCapture* which can be created either by a camera source or by a file name. How can I set a youtube video file as the source for CvCapture*? Thanks,

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  • creating a radiobutton control in vb.net

    - by reffer
    ok this is my code in vb.net behind where i am creating the radiobutton - TD = New HtmlTableCell Dim rdb As New RadioButton() rdb.ID = "rdb_ads_" & DR("ID") TD.Controls.Add(rdb) TR.Cells.Add(TD) It displays the radiobutton, but doesnt select single. i can select all at one time. how do i make it to select only 1 at a time. i know its basic for u guys, but will help me a lot

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  • "Beveled" Shapes in Quartz 2D

    - by Shaggy Frog
    I'm familiar with some of the basics of Quartz 2D drawing, like drawing basic shapes and gradients and so on, but I'm not sure how to draw a shape with a "beveled" look, like this: Essentially we've got a shine on one corner, and maybe some shading in the opposite corner. I think -- I didn't make this image, although I'd like to be able to approximate it. Any ideas? This is on the iPhone, and I'd like to use built-in frameworks and avoid any external libraries if at all possible.

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  • Python: ImportError no module named urllib

    - by Yury Lifshits
    I just rented a VPS from Linode, it has python2.5 and ubuntu 8.04 When I ho to python shell python import urllib I get ImportError: No module named urllib What can be the reason? How can I add this module to python? Isn't it prepackaged with the basic version? Can it be pythonpath problem? How I can test pythonpath?

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  • Failing to install activerecord-jdbcmysql-adapter gem

    - by Phil Sturgeon
    I am trying to follow the basic "Create a blog in 20 minutes" Rails screencast but have hit a stumbling block already. When I try to rake db:migrate I get errors about the gem activerecord-jdbcmysql-adapter not being installed. When I try to install it, I am told it doesn't exist. If I try to simply gem install mysql I get all sorts of madness appearing. I am running this on Mac OS X 10.6.2 and my installation was all done through gem. My basic setup works (Hello world!). Here is the error log: $ rake db:migrate (in /Users/xxxx/Sites/blog) rake aborted! Please install the jdbcmysql adapter: gem install activerecord-jdbcmysql-adapter (no such file to load -- active_record/connection_adapters/jdbcmysql_adapter) (See full trace by running task with --trace) $ sudo gem install activerecord-jdbcmysql-adapter ERROR: could not find gem activerecord-jdbcmysql-adapter locally or in a repository $ sudo gem install mysql Password: Building native extensions. This could take a while... ERROR: Error installing mysql: ERROR: Failed to build gem native extension. /opt/local/bin/ruby extconf.rb checking for mysql_query() in -lmysqlclient... no checking for main() in -lm... yes checking for mysql_query() in -lmysqlclient... no checking for main() in -lz... yes checking for mysql_query() in -lmysqlclient... no checking for main() in -lsocket... no checking for mysql_query() in -lmysqlclient... no checking for main() in -lnsl... no checking for mysql_query() in -lmysqlclient... no checking for main() in -lmygcc... no checking for mysql_query() in -lmysqlclient... no * extconf.rb failed * Could not create Makefile due to some reason, probably lack of necessary libraries and/or headers. Check the mkmf.log file for more details. You may need configuration options. Provided configuration options: --with-opt-dir --without-opt-dir --with-opt-include --without-opt-include=${opt-dir}/include --with-opt-lib --without-opt-lib=${opt-dir}/lib --with-make-prog --without-make-prog --srcdir=. --curdir --ruby=/opt/local/bin/ruby --with-mysql-config --without-mysql-config --with-mysql-dir --without-mysql-dir --with-mysql-include --without-mysql-include=${mysql-dir}/include --with-mysql-lib --without-mysql-lib=${mysql-dir}/lib --with-mysqlclientlib --without-mysqlclientlib --with-mlib --without-mlib --with-mysqlclientlib --without-mysqlclientlib --with-zlib --without-zlib --with-mysqlclientlib --without-mysqlclientlib --with-socketlib --without-socketlib --with-mysqlclientlib --without-mysqlclientlib --with-nsllib --without-nsllib --with-mysqlclientlib --without-mysqlclientlib --with-mygcclib --without-mygcclib --with-mysqlclientlib --without-mysqlclientlib Gem files will remain installed in /opt/local/lib/ruby/gems/1.8/gems/mysql-2.8.1 for inspection. Results logged to /opt/local/lib/ruby/gems/1.8/gems/mysql-2.8.1/ext/mysql_api/gem_make.out

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  • Github post commit trigger build in Hudson with security enabled

    - by Jerry Cheung
    Github has no problem with triggering a build in Hudson with security turned off because the build is a public URL. But I'd like to be able to have logins required on Hudson so that people can't arbitrarily build. I tried looking for a HTTP basic auth method so I can include the credentials in the URL itself, but couldn't find anything like that. Has anyone used Hudson with Github and run into this problem?

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  • Adding multiple vectors in R

    - by Elais
    I have a problem where I have to add thirty-three integer vectors of equal length from a dataset in R. I know the simple solution would be Vector1 + Vector2 + Vector3 +VectorN But I am sure there is a way to code this. Also some vectors have NA in place of integers so I need a way to skip those. I know this may be very basic but I am new to this.

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  • pdf viewer for pyqt4 application?

    - by japs
    Hi all, I'm writing a Python+Qt4 application that would ideally need to pop up a window every once in a while, to display pdf documents and allow very basic operations, namely scrolling through the different pages and printing the document. I've found the reportLab to create pdf files, but nothing about pdf viewers. Does anyone knows anything that might help. i was really hoping for the existence of something like the QWebView widget... thanks in advance to all

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  • Tomcat threads vs Java threads

    - by black666
    When using java threads, one has to take care of the basic problems that come with concurrency through synchronization etc. AFAIK Tomcat also works with threads to handle its workload. Why is it, that I don't have to think about making my code threadsafe when it is running in Tomcat?

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  • Google Ajax search API

    - by jAndy
    Hi Folks, I'm wondering, is it possible to receive google results over their own ajax API in a way like, 100 results per page? Without a visible search field, I'd like to get the results in the background to create a progression for some search phrases. My basic question is, what are the restrictions of the google search api ? Kind Regards --Andy

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  • Worst security hole you've seen?

    - by Si
    Subject says it all, probably a good idea to keep details basic to protect the guilty. FWIW, here's a question about what to do if you find a security hole, and another with some useful answers if a company doesn't (seem to) respond.

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  • Native Windows Application Development Options

    - by Michael Stum
    Long winded title, short question: If one wants to develop for Windows but not have to rely on any external dependency (no runtime, thus ruling out .net), what supported, alive and fully functioning* alternatives are there? Visual Basic 6 is dead, Visual C++ is obvious and Delphi seems to be the prime choice for that, but I wonder if there are any other alternatives? *as in: Being able to use all the Windows Features like putting an icon in the Notification Area, making the Taskbar Icon flash etc.

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