rebol tutorial - Page 126

Ad-Hoc mode and Cell (how does it work)?

- by Ori Cohen

hello, I am setting up a wireless Ad-Hoc network manually in linux using iwconfig and ifconfig. I have gotten everything working, and I think I understand it all except access point. The part that confused me is this: If I have essid='some_id', channel=11, Mode=Ad-Hoc and appropriate routing/ip on both laptops, why do I need to make sure the Cell is the same? I was under the impression that Ad-Hoc worked independently of the access point. I can easily get around this, I just use iwconfig wlan0 ap 00:00:00:00:00:01 Why is this necessary? I've been unable to find a good tutorial on this. If anyone can clear this up I'd appreciate it. Thanks

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How to include css in a hmvc setup in codeigniter

- by tariq

I have setup the combination Codeigniter + HMVC + Twitter Bootstrap using this tutorial. I have created two modules named app and session. The app module contains the twitter bootstrap sample. When I click on About link, a new login page is displayed which is the session module configured using <?php echo Modules::run('session/session/index'); ?> The problem I am facing is that when I include the twitter bootstrap in both the views, the app module gets realigned and corousal doesnt work. How do I get the CSS to work with the session module ?

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Setting up Subsonic 3.0 on a ASP.NET web application on Visual Studio 2008

- by Rob Paul

I followed the steps on this tutorial video by at subsonic website. Everything seems to be self explanatory but when I copy the .tt files into my Visual Studio nothing happens. I have read other question relating to this problem on this website but they don't seem to fix this problem. I also went into the regedit to find out the generator key for .tt files and it is properly set. This is not a visual studio express or anything but a professional edition also I am trying to build a ASP.net web application and not a MVC application like the demo. Any help will be greatly appreciated. Thank You

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LINQ to SQL repository - caching data

- by creativeincode

I have built my first MVC solution and used the repository pattern for retrieving/inserting/updating my database. I am now in the process of refactoring and I've noticed that a lot of (in fact all) the methods within my repository are hitting the database everytime. This seems overkill and what I'd ideally like is to do is 'cache' the main data object e.g. 'GetAllAdverts' from the database and to then query against this cached object for things like 'FindAdvert(id), AddAdvert(), DeleteAdvert() etc..' I'd also need to consider updating/deleting/adding records to this cache object and the database. What is the best apporoach for something like this? My knowledge of this type of things is minimal and really looking for advice/guidance/tutorial to point me in the right direction. Thanks in advance.

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Rails CSV import, adding to a related table

- by Jack

Hi, I have a csv importing system on my app (used locally only) which parses the csv file line by line and adds the data to the database table. This is based on a tutorial here. require 'csv' def csv_import @parsed_file=CSV::Reader.parse(params[:dump][:file]) n = 0 @parsed_file.each_with_index do |row, i| next if i == 0 #ignore the first row course = Course.new course.title = row[0] course.unit_code = row[1] course.course_type = row[2] course.value = row[3] course.pass_mark = row[4] if course.save n = n+1 GC.start if n%50==0 end flash.now[:message] = "CSV Import Successful, #{n} new courses added to the database." end redirect_to(courses_url) end This is all in the courses controller and works fine. There is a relationship that courses HABTM years and years HABTM courses. In the csv file (effectively in row[5] to row[8]) are the year_id s. Is there a way that I can add this within the method above. I am confused as to how to loop over the 4 items and add them to the courses_years table. Thank you Jack

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Machine learning in OCaml or Haskell?

- by griffin

I'm hoping to use either Haskell or OCaml on a new project because R is too slow. I need to be able to use support vectory machines, ideally separating out each execution to run in parallel. I want to use a functional language and I have the feeling that these two are the best so far as performance and elegance are concerned (I like Clojure, but it wasn't as fast in a short test). I am leaning towards OCaml because there appears to be more support for integration with other languages so it could be a better fit in the long run (e.g. OCaml-R). Does anyone know of a good tutorial for this kind of analysis, or a code example, in either Haskell or OCaml?

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Mac OS X: java.lang.ClassNotFoundException: com.sun.java.browser.plugin2.DOM

- by Thilo

I am trying to use the new LiveConnect features introduced in Java 6 Update 10. Code looks like this (copied from the applet tutorial): Class<?> c = Class.forName("com.sun.java.browser.plugin2.DOM"); Method m = c.getMethod("getDocument", java.applet.Applet.class); Document document = (Document) m.invoke(null, this); But all I am getting is a ClassNotFoundException for the entry-point class. This on the Mac, 10.6, with both Firefox and Safari. Java Plug-in 1.6.0_22 Using JRE version 1.6.0_22-b04-307-10M3261 Java HotSpot(TM) 64-Bit Server VM Is this not implemented on the Mac? Or do I need to configure something? All I need to do is get and set the value of form elements on the page, so I would be fine with an older (pre-6u10) API if that works better.

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How to build a data flow?

- by salvationishere

I am running Visual Studio 2008, the SSIS Tutorial described on: http://msdn.microsoft.com/en-us/library/ms167106.aspx I finished all of the tasks but am getting following errors: Error 1 Validation error. Extract Sample Currency Data: Extract Sample Currency Data: input column "CurrencyAlternateKey" (123) has lineage ID 55 that was not previously used in the Data Flow task. Lesson 1.dtsx 0 0 Error 2 Validation error. Extract Sample Currency Data SSIS.Pipeline: input column "CurrencyAlternateKey" (123) has lineage ID 55 that was not previously used in the Data Flow task. Lesson 1.dtsx 0 0 Can you tell what I need to do to make this build without errors?

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How to migrate existing udp application to raw sockets

- by osgx

Hello Is there a tutorial for migration from plain udp sockets (linux, C99/C++, recv syscall is used) to the raw sockets? According to http://aschauf.landshut.org/fh/linux/udp_vs_raw/ch03s04.html raw socket is much faster than udp. Application is client-server. client is proprietary and must use exactly same procotol as it was with udp server. But server can be a bit faster with raw sockets. What parts of udp I must to implement in server? Is there a "quick migration" libraries?

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"Invalid signature": oAuth provider with Django-piston

- by Martin Eve

Hi, I'm working with django-piston to attempt to create an API that supports oAuth. I started out using the tutorial at: http://blog.carduner.net/2010/01/26/django-piston-and-oauth/ I added a consumer to piston's admin interface with key and secret both set to "abcd" for test purposes. The urls are successfully wired-up and the oAuth provider is called. However, running my get request token tests with tripit (python get_request_token.py "http://127.0.0.1:8000/api" abcd abcd), I receive the following error: Invalid signature. Expected signature base string: GET&http%3A%2F%2F127.0.0.1%3A8000%2Fapi%2Foauth%2Frequest_token%2F&oauth_consumer_key%3Dabcd%26oauth_nonce%3D0c0bdded5b1afb8eddf94f7ccc672658%26oauth_signature_method%3DHMAC-SHA1%26oauth_timestamp%3D1275135410%26oauth_version%3D1.0 The problem seems to lie inside the _check_signature method of Piston's oauth.py, where valid_sig = signature_method.check_signature(oauth_request, consumer, token, signature) is returning false. I can't, however, work out how to get the signature validated. Any ideas? -----Update----- If I remove the test consumer from piston's backend, the response returned is correctly set to "Invalid consumer", so this lookup appears to be working.

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Error in writting a class.

- by Richard

I am running through a tutorial online at http://www.sthurlow.com/python/lesson08/ and I believe I understand how classes work in python, at least to some degree but when I run this code: class Shape: def init(self,x,y): self.x = x self.y = y description = "This shape has not been described yet" author = "Nobody has claimed to make this shape yet" def area(self): return self.x * self.y def perimeter(self): return 2 * self.x + 2 * self.y def describe(self,text): self.description = text def authorName(self,text): self.author = text def scaleSize(self,scale): self.x = self.x * scale self.y = self.y * scale I get this error: Traceback (most recent call last): File "Y:/python/Shape.py", line 1, in -toplevel- class Shape: File "Y:/python/Shape.py", line 17, in Shape self.y = self.y * scale NameError: name 'self' is not defined Any Help would be great Thanks Richard

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Android : Hello, Views > Google Map View Tuorial

- by Tom

Hi, I'm trying to complete the Android MapView tutorial @ www.developer.android.com/resources/tutorials/views/hello-mapview.html I think I've done the entire thing correctly but I'm getting an error message in Eclipse. I'm sure why. The problematic line of code is private ArrayList<OverlayItem> mOverlays = new ArrayList<OverlayItem>(); I'm relatively new to Java but I've gone through the forums of different things and I really have no idea on this one. I've [attached][2] a screen shot of the development environment - hopefully it wont be anything too obvious or hard to fix either! http://lh5.ggpht.com/_sqCs2rXr5hQ/S-CJf4x9ZUI/AAAAAAAAAHI/IR-kTcOnfU8/s144/hellogooglemaps.jpg Cheers Tom :)

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One click login to my google apps solution how can I do it?

- by Ali

Hi guys I'm developing a google apps solution and I'm building on the tutorial application give by google at http://code.google.com/googleapps/marketplace/tutorial_php.html - the thing is that the example given sets up the application such that the user has to enter in manually the email address or username and then it takes the user through an authentication process whereby it asks the user if they wish to allow the application to be given access to the services mentioned in the manifest.xml file. Isn't there a better way to do this I mean like I want that when the user upon logging into his google apps account just has to click in the application link installed and straight on should be able to enter the application. Can't the process of authentication and all be transparent in the backdrop. I need help on this asap. Thanks a bunch!

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php error: unexpected T_OBJECT_OPERATOR.... trying to install magento using ssh commands to dreamhos

- by Jane

I am trying to install magento (e-commerce platform) I am following a tutorial that tells me to run this command using ssh: ./pear mage-setup but i'm getting this error: Parse error: syntax error, unexpected T_OBJECT_OPERATOR in /home/domainname.com/downloader/pearlib/php/System.php on line 400 Line 400 is commented in the code snippit from the system.php file: /* Magento fix for set tmp dir in config.ini */ if (class_exists('Maged_Controller',false)) { /*line 400 */ $magedConfig = Maged_Controller::model('Config',true)->load();** if ($magedConfig->get('use_custom_permissions_mode') == '1' && $mode = $magedConfig->get('mkdir_mode')) { $result = System::mkDir(array('-m' . $mode, $tmpdir)); } else { $result = System::mkDir(array('-p', $tmpdir)); } if (!$result) { return false; } } Can anyone help my demystify this error?

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newb to assembly programming

- by ida

i am on a mac (10.6.3) with snow leopard. i hear that the assembly language i work with has to be valid with the chipset that you use. i am completly new to this i have a basic background in C and Objective-C programming and an almost strong background in php. Ive always wanted to see what assembly is all about. the tutorial ill be looking at is by VTC via (http://www.vtc.com/products/Assembly-Language-Programming-Tutorials.htm). what i want to know is are the tutorials that im about to do compatible with the version of mac that i have? sorry i am completly new to this language although i do recall studying some of it way way back in the day. i do have xcode and what i'm wondering is what kind of document would i open in xcode to work with assembly and does the mac have a built in hex editor (when it comes time to needing it)? thanks

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Communication between java server and matlab client

- by user272587

I'd like to establish a server(Java)/client (Matlab) communication using socket. They can send messages to each other. An example shows how to do this in Java server and Java client, http://java.sun.com/docs/books/tutorial/networking/sockets/clientServer.html. When I try to rewrite the client part in Matlab, I only can get the first message that the Java server sends and display it in the Matlab command window. When I type a message in the Matlab command window, I can't pass it to the Java Server. Jave code: kkSocket = new Socket("localhost", 3434); Matlab equivalent: kkSocket = Socket('localhost', 3434); Java code for client: out = new PrintWriter(kkSocket.getOutputStream(), true); in = new BufferedReader(new InputStreamReader(kkSocket.getInputStream())); What would be a Matlab equivalent for this? Thanks in advance.

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using extends with Java Generics

- by Sandro

Lets say that I have the following code: public class Shelter<A extends Animal, B extends Animal> { List<A> topFloor = new Vector<A>(); List<B> bottomFloor = new Vector<B>(); public A getFirstTopFloorAnimal(){return topFloor.firstElement();} public B getFirstBottomFloorAnimal(){return bottomFloor.firstElement();} //This compiles but when I try to use it, it only returns objects public List<Animal> getAnimals() { Vector a = new Vector(topFloor); a.addAll(bottomFloor); return a; } } Now for somereason the following code compiles. But when I try to use getAnimals() I get a of objects instead of Animal. Any ideas why this is? Does this have to do with the List is NOT a List idea in the Generics tutorial? Thank you.

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Web service can't open named pipe - access denied

- by Patrick

Hi All, I've got a C++ service which provides a named pipe to clients with a NULL SECURITY_ATTRIBUTES as follows: hPipe = CreateNamedPipe( lpszPipename, PIPE_ACCESS_DUPLEX | FILE_FLAG_OVERLAPPED, PIPE_TYPE_BYTE | PIPE_READMODE_BYTE | PIPE_WAIT, PIPE_UNLIMITED_INSTANCES, BUFSIZE, BUFSIZE, 0, NULL); There is a dll which uses this pipe to get services. There is a c# GUI which uses the dll and works fine. There is a .net web site which also uses this dll (the exact same one on the same PC) but always gets permission denied when it tries to open the pipe. Any one know why this might happen and how to fix it? Also does anyone know of a good tutorial on SECURITY_ATTRIBUTES because I haven't understood the msdn info yet. Thanks, Patrick

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Printf is not printing anything to output? C++ SDL

- by Qasim

I am trying to use "printf" in my Visual C++ project however it is not working. Using Lazy Foo's tutorial, I set up SDL in my project, but when I play it, printf doesnt do anything. #include "SDL.h" #include <stdio.h> int main( int argc, char* args[] ) { printf("Testing"); return 0; } The output looks like this: The program '[4664] SDL Testing.exe: Native' has exited with code 0 (0x0). And that's about it. What could be wrong?

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How do I get the current color of a fragment?

- by Mason Wheeler

I'm trying to wrap my head around shaders in GLSL, and I've found some useful resources and tutorials, but I keep running into a wall for something that ought to be fundamental and trivial: how does my fragment shader retrieve the color of the current fragment? You set the final color by saying gl_FragColor = whatever, but apparently that's an output-only value. How do you get the original color of the input so you can perform calculations on it? That's got to be in a variable somewhere, but if anyone out there knows its name, they don't seem to have recorded it in any tutorial or documentation that I've run across so far, and it's driving me up the wall.

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Integrating GWT, Spring and JPA (Eclipse-link) in Weblogic 10

- by MVK

Hi, My application architecture looks like this. GWT in the UI layer - Calls GWT RPC service (servlets) - Looksup Spring Beans - Calls the DAO layer which is implemented in JPA (EclipseLink). I have successfully tested the application with GWT rpc services directly calling the JPA layer. But I am having trouble integrating spring into the mix. (Primary usage of Spring is transaction management). I tried googling, but could not find any good article on the topic. (Most of the articles refers to using Spring MVC within GWT, which is not what I am looking for) Could you please point me to some article/tutorial? Thanks in advance! Manoj

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Java Swing: How to make the JComboxBox drop down list taller?

- by NoozNooz42

How to make the "dropdown" (or "popup", I don't know how it's called) of a JComboBox taller on the screen? By default, when I open my JComboBox I see, say, 7 out of 29 items, then I need to scroll. What should I do so that I can see, say, 15 out of these 32 items? (or if the dropdown is, say, 150 pixels tall, how can I make it 300 pixels tall?) I've read the Sun tutorial on JComboBox and the JavaDoc but I must have overlooked the method(s) to call.

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Getting started with silverlight 3 mvvm

- by bplus

I've just written my first silverlight 3 app. It's written using the code behind in a rater messy way. I want to refactor into mvvm. I'm finding it extremely difficult to find any tutorials on this. So far from what I can gather I'll probably need a mvvm framework. Mvvm-light toolkit sounds like it might be what I want, but I can't find a beginners tutorial. This is actually more frustrating than I thought - do I actually need a framework? Would I maybe be better just trying to do this from scratch with out a framework? How did you get started with silverlight and mvvm? Also I'm using vs2008 so silverlight 4 is a non starter for me. Thanks in advance for any pointers.

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ffmpeg libavcodec.so missing while compile with cygwin

- by nick

I am building ffmpeg for android by following this tutorial now i got android folder inside the ffmpeg2.0.1 folder but there is no libavcodec-55.so file. instead of that i have lib/libavcodec.a how can i get libavcodec.so file? build_android.sh #!/bin/bash NDK=$HOME/Desktop/adt/android-ndk-r9 SYSROOT=$NDK/platforms/android-9/arch-arm/ TOOLCHAIN=$NDK/toolchains/arm-linux-androideabi-4.8/prebuilt/windows-x86_64 function build_one { ./configure \ --prefix=$PREFIX \ --enable-shared \ --disable-static \ --disable-doc \ --disable-ffmpeg \ --disable-ffplay \ --disable-ffprobe \ --disable-ffserver \ --disable-avdevice \ --disable-doc \ --disable-symver \ --cross-prefix=$TOOLCHAIN/bin/arm-linux-androideabi- \ --target-os=linux \ --arch=arm \ --enable-cross-compile \ --sysroot=$SYSROOT \ --extra-cflags="-Os -fpic $ADDI_CFLAGS" \ --extra-ldflags="$ADDI_LDFLAGS" \ $ADDITIONAL_CONFIGURE_FLAG make clean make make install } CPU=arm PREFIX=$(pwd)/android/$CPU ADDI_CFLAGS="-marm" build_one

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