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  • Learning to read GCC assembler output

    - by porgarmingduod
    I'm considering picking up some very rudimentary understanding of assembly. My current goal is simple: VERY BASIC understanding of GCC assembler output when compiling C/C++ with the -S switch. Just enough to do simple things such as looking at a single function and verifying whether GCC optimizes away things I expect to disappear. Does anyone have/know of a truly concise introduction to assembly, relevant to GCC and specifically for the purpose of reading, and a list of the most important instructions anyone casually reading assembly should know?

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  • Hidden limitations of Google App Engine?

    - by Kyle Cronin
    I've been looking into writing a web app that will run on Google App Engine, but before I commit myself to the platform I'd like to know what, if any, limitations there are. I'm aware of the basic CPU/bandwidth restrictions that Google places on the free service, but I'm wondering more about development restrictions like how BigTable compares to a standard relational database and what Python libraries aren't available on the GAE platform (and what alternatives Google provides). Basically I'm looking for any hidden roadblocks before I commit to the platform. Thanks for your help!

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  • Catch all DOM events on a page (without Firebug et. al.)

    - by Morten Bergfall
    How would I go about creating a cross-browser script, that would intercept all events firing on a page/browser window/DOM-tree (regardless of browser)? What I'm hoping to accomplish is basically to get a better understanding of the different handling of events in different browsers; I know the basic theory, but need to see to believe...

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  • Lisp: Determine if a list contains a predicate

    - by justkt
    As part of a homework assignment in Lisp, I am to use apply or funcall on any predicates I find. My question (uncovered in the coursework) is: how do I know when I've found a predicate in my list of arguments? I've done some basic google searching and come up with nothing so far. We're allowed to use Lisp references for the assignment - even a pointer to a good online resource (and perhaps a specific page within one) would be great!

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  • Use my own authentication in tomcat

    - by mabuzer
    how can I force tomcat to use my own implementation of Authenticator, and not the existing one like [FORM, BASIC, DIGEST,, etc]. I know if I added my authentication class name in org.apache.catalina.startup.Authenticators.properties it would work,,, any help please... I need an alternative for this...

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  • Control characters as delimiters

    - by Gio Borje
    I have a nodejs TCP server and a client. Basic network communication happens. Client sends "data + STX_CHARACTER + data + ETX_CHARACTER" (just an example). How do I split the string using the STX Control Character as a delimiter or how do I reference the character at all in Javascript.

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  • Getting the Position of an Android phone by using GPS

    - by poeschlorn
    Hey, it's me again, I've got another question regarding to basic Android programming: How can I access the GPS for getting the current Position of the mobile phone the app is running on? How long can this take to retrieve the information? In this case the GPS might be disabled, how can I enable/disable it again. Which permissions must be granted in the andorid manifest? Greetings and thanks for ur answers, poeschlorn

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  • how to write a script that logs into an application and checks a page

    - by josh
    Is it possible to write a script that will login to an application using uname/pwd? the username/password are not passed in through POST (they dont come in the URL) Basic steps I am looking for are: Visit url enter uname/pwd click a button click a link get the raw html to make sure it does not have 500 error Is that possible to do in any language? Please point me to some examples as well

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  • Does a hidden UIViewController consume any resources (iPhone)?

    - by MrDatabase
    My simple iPhone game has two basic "screens": home screen (UIViewController subclass) game screen (UIWindow w/ EAGLLayer where all the OpenGL drawing happens) Currently when the user taps "Play" on the homescreen the UIViewController is just hidden and the game screen is revealed. When the game is over the homescreen UIViewController is unhidden. Does the hidden UIViewController consume any resources when it's hidden?

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  • Java: Cannot listen to port, BindException

    - by bguiz
    Hi, I am developing an application in Netbeans, and it is using JavaDB. I can connect to it and execute queries without issues, but for some reason, the "Output - JavaDB Database Process" pane within Netbeans keeps displaying Security manager installed using the Basic server security policy. Could not listen on port 1527 on host localhost: java.net.BindException: Address already in use How do I find out what process is already using, or bound to, that port number?

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  • .Net Remote Log Querying

    - by jlafay
    I have a Win Service that I'm working on that consists of the service, WF Service (using WorkflowServiceHost), a Workflow (WorkflowApplication) that queries/processes data from a SQL Server DB, and a Comm Marshall class that handles data flow between the service and the WF. The WF does a lot of heavy data processing and the original app (early VB6) logged all the processing and displayed the results on the screen of the host machine. Critical events will be committed to eventlog because I strongly believe that should be common practice because admins naturally will look there and because it already has support for remote viewing. The workflow will also need to write logging events as it processes and iterates according to our business logic. Such as: records queried, records returned, processed records, etc. The data is very critical and we need to log actions as they occur. The logs are currently kept as text files on disk and I think that is ok. Ideally I would like to record log events in XML so it's easier to query and because it is less costly than a DB, especially since our DB servers do a lot of heavy processing anyways. Since we are replacing essentially a VB6 application with a robust windows service (taking advantage of WF 4.0), it has been requested that a remote client also be created. It receives callbacks from the service after subscribing to it and being added to a collection of subscribers. Basic statistics and summaries are updated client side after receiving basic monitoring data of what is going on with the service. We would like to also provide a way to provide details when we need to examine what is going on further because this is a long running data processing service and issues need to be addressed immediately. What is the best way to implement some type of query from the client that is sent to the service and returned to the client? Would it be efficient to implement another method to expose on the service and then have that pass that off to some querying class/object to examine the XML files by whichever specification and then return it to the client? That's the main concern. I don't want the service to processing to bottleneck much while this occurs. It seems that WF already auto-magically threads well for the most part but I want to make sure this is the right way to go about it. Any suggestions/recommendations on how to architect and implement a small log querying framework for a remote service would be awesome.

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  • How do I create a ListBox In Ext-GWT ?

    - by Salvin Francis
    Plain and Simple, I want to use a Listbox in my project, The demo here: http://www.extjs.com/examples shows no answer, In fact, I really hate it when companies show-off their 'complex' widgets in this manner and fail to show the most basic of all widgets. For example, I discovered class SimpleComboBox over the net till then I assumed that we required a class to contain list store, etc...

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  • Small Command line scripter (like Autocad commands) one line editor

    - by Objectsberg
    Basically I don't know from where to start, I need to add a line script for my application that is not so complicated, just to execute pre-defined commands, for instance: command New Invoice -- create new invoice command customer profile -- open customer form where cust id = CustID command run End-Of-Day - run the end of day process command scr 1020 -- open form id = 1020 How can I start? I have no problem of recommending any third party components (parsers,evaluators,etc..). whats missing is the basic structure no details, just a theory for implementation. Thanks, Objectberg

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  • drupal (CMS) or codeigniter (MVC) for creating a new web application?

    - by ajsie
    im going to create a new web application that is very customized. it will contain images, that are fully searchable - in a very, very customized way. when you click on the pictures you can add comments and so on. it requires users to be registered, but the registration/login process will be highly customized too. at the moment im using CodeIgniter for this. But i've read a lot of posts about CMS like Drupal and it sounds like i could let it handle basic stuff, maybe design and other front end work. i have no experience with CMS, in fact, i just started to use a MVC framework like CI and was impressed of how much easier it gets to start developing. so i wonder, if i'm going to create this kind of application, could i use drupal and then add the usual stuff, as i was going to do with CodeIgniter, like controllers, views, models, config files, my own libraries and so on? how does it work on a system like Drupal. how do you code PHP with it as with any MVC framework. it sounds like it has a lot of modules, i just wonder, if i can use it as a MVC framework but have the benefit of having all these basic stuff and design ready to use? cause then it sounds like the best "library" to provide for a web application from scratch. or is it difficult to create a customized app with it? i guess it has modules like images and users, but then how could i customize these so that every image has tags on it and country information, or have every user subscribing to changes to an image, that email will be sent to users and so on? cause i guess its easy to install a module. the question is, how do i customize it. maybe i don't need all that table columns. maybe i want to add/remove business logic. what are the pros and cons with using Drupal for this? is it even the right way to go? can you make a Stackoverflow with Drupal? Facebook? Twitter? Youtube? assuming that you know php of course. share your thoughts cause im totally new on creating a web application! thanks

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  • Why do we need to use ConvertBack in IValue Converter

    - by Subhen
    Hi, I am not sure Why we need to use I ConvertBack method in IValueConverter. In the Convert method itself we do the conversion and return the updated value to be bound in our control. So in which Scenario we should use Convertback. I know this question is very basic but just wanted to make the fundamentals clear. Thanks a lot for your help and suggestions. Thanks, Subhen

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  • What is an overloaded operator in c++?

    - by Jeff
    I realize this is a basic question but I have searched online, been to cplusplus.com, read through my book, and I can't seem to grasp the concept of overloaded operators. A specific example from cplusplus.com is: // vectors: overloading operators example #include <iostream> using namespace std; class CVector { public: int x,y; CVector () {}; CVector (int,int); CVector operator + (CVector); }; CVector::CVector (int a, int b) { x = a; y = b; } CVector CVector::operator+ (CVector param) { CVector temp; temp.x = x + param.x; temp.y = y + param.y; return (temp); } int main () { CVector a (3,1); CVector b (1,2); CVector c; c = a + b; cout << c.x << "," << c.y; return 0; } from http://www.cplusplus.com/doc/tutorial/classes2/ but reading through it I'm still not understanding them at all. I just need a basic example of the point of the overloaded operator (which I assume is the "CVector CVector::operator+ (CVector param)"). There's also this example from wikipedia: Time operator+(const Time& lhs, const Time& rhs) { Time temp = lhs; temp.seconds += rhs.seconds; if (temp.seconds >= 60) { temp.seconds -= 60; temp.minutes++; } temp.minutes += rhs.minutes; if (temp.minutes >= 60) { temp.minutes -= 60; temp.hours++; } temp.hours += rhs.hours; return temp; } from "http://en.wikipedia.org/wiki/Operator_overloading" The current assignment I'm working on I need to overload a ++ and a -- operator. Thanks in advance for the information and sorry about the somewhat vague question, unfortunately I'm just not sure on it at all.

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  • What's the best way to mix Ruby and other languages? (Especially C++)

    - by Andy
    Hi, I'm learning Ruby, and I'm starting to play with building extensions in C. I have Programming Ruby The Pragmatic Programmers' Guide and so I can follow that for the basic nuts and bolts. What I was wondering is if there already existed some nifty frameworks/whatever to help interoperability between Ruby and other languages, with C++ being the most important for me. I've tried googling, but the results focus on language comparisons, rather than language interoperability. TIA, Andy

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  • xcode compile console application - c programming

    - by Alan
    Is it possible to use Xcode using iPhone 3.1.3 SDK to compile a standard C program that will work on the iphone? I'm trying to use xcode to compile a basic 'hello world' but to no avail. Do I need to obtain an additional application template or am I just missing something?

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