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• IronPython memory leak?

  - by Mike Gates

  Run this: for i in range(1000000000): a = [] It looks like the list objects being created never get marked for garbage collection. From a memory profiler, it looks like the interpreter's stack frame is holding onto all the list objects, so GC can never do anything about it. Is this by design?

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• Python style: if statements vs. boolean evaluation

  - by mkscrg

  One of the ideas of Python's design philosophy is "There should be one ... obvious way to do it." (PEP 20), but that can't always be true. I'm specifically referring to (simple) if statements versus boolean evaluation. Consider the following: if words: self.words = words else: self.words = {} versus self.words = words or {} With such a simple situation, which is preferable, stylistically speaking? With more complicated situations one would choose the if statement for readability, right?

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• SMS + Web app: Providers of SMS "Long codes" for use by U.S. carrier subscribers within U.S.?

  - by fourh

  Q.: How to get a cellular phone SMS "Long code" for use by U.S. carrier subscribers within U.S.? Background: I'm building a web app that receives queries from/sends answers to cell phones. The app design (and business model) expects to communicate with cell devices via SMS, addressing the web app via an SMS "Long code" (VMN or MSISDN). The mobile phone subscribers will be sending/receiving within the U.S. and using U.S. carriers. Long codes are not available within the U.S. cellular services.

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• Open Source - EER Modeling Tool

  - by Nick Fergis

  Is there a good open source or reasonably priced EER modeling tool for MySQL besides MySQL Workbench? I find the MySQL Workbench interface to be clunky. I would like to be able to manage my production schema beginning all design changes in the EER and propogating those out to my schema for created and altered tables. Is anyone use a tool they love to manage their environments in this way? Thanks. - Nick

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• MS Exam 70-536 - How can you constrain the input before you write any code?

  - by Max Gontar

  Hello! In MS Exam 70-536 .Net Foundation, Chapter 3 "Searching, Modifying, and Encoding Text" in Case Scenario 1 related to regex there is a question: How can you constrain the input before you write any code? I thought it's maybe a in-mind design of regex pattern but it will not really constrain the input, will it? I am not so good in psychokinesis yet! Or maybe the is some other way? Thanks for your time!

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• how to place text or image over another one ?

  - by tismon

  Hi, i am trying to place something(text/image) on another image. how can i do this in Action script ? My pain area is to find out the edges of the base image and bend the placing script or image accordingly.. An example for this can be http://www.zazzle.com/cr/design/pt-mug. somebody please help me. regards tismon

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• Web application UI examples

  - by JBeckton

  I am currently prototyping a line of business application for the company I work for. It will be web based written in ASP.Net. I am looking for some web application UI examples to give me some creative ideas to jump start the UI design and layout.

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• Authenticating users in iPhone app

  - by Myron

  I'm developing an HTTP api for our web application. Initially, the primary consumer of the API will be an iPhone app we're developing, but I'm designing this with future uses in mind (such as mobile apps for other platforms). I'm trying to decide on the best way to authenticate users so they can access their accounts from the iPhone. I've got a design that I think works well, but I'm no security expert, so I figured it would be good to ask for feedback here. The design of the user authentication has 3 primary goals: Good user experience: We want to allow users to enter their credentials once, and remain logged in indefinitely, until they explicitly log out. I would have considered OAuth if not for the fact that the experience from an iPhone app is pretty awful, from what I've heard (i.e. it launches the login form in Safari, then tells the user to return to the app when authentication succeeds). No need to store the user creds with the app: I always hate the idea of having the user's password stored in either plain text or symmetrically encrypted anywhere, so I don't want the app to have to store the password to pass it to the API for future API requests. Security: We definitely don't need the intense security of a banking app, but I'd obviously like this to be secure. Overall, the API is REST-inspired (i.e. treating URLs as resources, and using the HTTP methods and status codes semantically). Each request to the API must include two custom HTTP headers: an API Key (unique to each client app) and a unique device ID. The API requires all requests to be made using HTTPS, so that the headers and body are encrypted. My plan is to have an api_sessions table in my database. It has a unique constraint on the API key and unique device ID (so that a device may only be logged into a single user account through a given app) as well as a foreign key to the users table. The API will have a login endpoint, which receives the username/password and, if they match an account, logs the user in, creating an api_sessions record for the given API key and device id. Future API requests will look up the api_session using the API key and device id, and, if a record is found, treat the request as being logged in under the user account referenced by the api_session record. There will also be a logout API endpoint, which deletes the record from the api_sessions table. Does anyone see any obvious security holes in this?

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• Can I get a WPF ListBox to inherit brushes from parent element?

  - by Jay

  My WPF window has its foreground brush set to a brush from a resource dictionary, and I want all text in the window to have this color, so I don't touch the foreground brush in anything else. Textboxes get the color Textblocks get the color Buttons get the color Listboxes do not get the color, and so neither do their contents. Is there any way to get a Listbox to behave like the other controls in this respect? Assuming not, and that this is by design, what is the rationale?

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• Threads in C# [Question]

  - by blez

  Thread1/2: do TotalThreads-- on their exit int TotalThreads = 2; void AsyncFunc() { // run thread for Func() } void Func() { // run Thread1 // run Thread2 while(TotalThreads > 0) { /* do nothing */ } // some code } is that bad design?

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• Free UI tools for Cappuccino?

  - by avp

  Hi, I'm looking for free tools to design the UI for my web app. I'm pretty new to this field, so please point me to acceptable solutions. Basically, I need to fill a "screen" with some controls, that's it. Thanks. EDIT: Well, as soon as nobody answers, maybe somebody can help me with this problem for some framework other than Cappuccino?

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• What are common uses of condition variables in C++?

  - by jasonline

  I'm trying to learn about condition variables. I would like to know what are the common situations where condition variables are used. One example is in a blocking queue, where two threads access the queue - the producer thread pushes an item into the queue, while the consumer thread pops an item from the queue. If the queue is empty, the consumer thread is waiting until a signal is sent by the producer thread. What are other design situations where you need a condition variable to be used?

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• What practical use/benefit does a ternary 'bit' based computer have?

  - by John

  Prototype working ternary device Quantum computing with qbits and so on is one thing, but what exactly do we stand to gain from a CPU which works on a ternary basis, where each 'bit' is ether yes/no/maybe (or true/false/filenotfound)? Is it simply an academic exercise or could it change processor design?

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• Is there a tool to generate MVC code in C#?

  - by Rity

  I was working on a project with a colleague and went out for lunch one day. Given that we only spent a few days doing design and no coding, I was surprised to find out that after lunch, he had over 40 files completed (various classes, interfaces, DTOs, etc). He told me he is just a fast typist but I need to know the real deal. He hasn't been able to sustain that kind of productivity just the initial skeletal code but still, any ideas how he did this?

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• HTML5 vs Flash ... Resources

  - by Barbara

  I'm a novice ...in that i've taken a few courses n poured through bunches of cool flash widgets, components and techniques. now it's time for my own website ... I do graphic design n really want to use some of the ready mades for convenience and economy...r there similar non flash products?

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• By knowing VC++ MFC, how difficult is to learn C#.Net?

  - by AKN

  Right now, I'm more into design & maintenance of MFC based application. I'm seeing good progress and requirement for C#.Net application. With this background knowledge, how easy or difficult is to learn C#.Net? Is there any tutorials available online that helps MFC developers to easily learn C#.Net quickly? Any help on this much appreciated!

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• what if i keep my class members are public?

  - by anish

  In c++ instance variables are private by default,in Python variables are public by default i have two questions regarding the same:- 1: why Python have all the members are public by default? 2: People say you should your member data should be private what if i make my data to be public? what are the disadvantages of this approch? why it is a bad design?

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• Andriod passing objects between activities

  - by Stan

  Say if I have a locationManager(LM) object in activity A, which is my main menu. All the sub-activities need to use LM. In a good design, should I pass LM object to sub-activities? how? Please suggest some good coding pattern. Thanks.

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• Flex Button Size Setting For Implementing Multilanguage

  - by user961496

  I'm creating a flex app with multilanguage support. But there's a problem with the design when I try to implement multilanguage support. For example : In Chinese : ?? In English : Good Morning The button size is not enough when I change the language to English. Although I set the button width with dynamic size, but the button will closing the objects around it Code is here http://pastebin.com/7fDB2VU2

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• Using OOP features with CakePHP?

  - by grokker

  Hi, have you applied OOP features like inheritance and polymorphism etc. while using CakePHP other than inherting the base AppController class, Model class etc. ? How about design patterns?

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• Is the Google I/O 2010 Android app open source?

  - by Erdal

  The Google I/O app was made by Google to help attendees to the conference track which sessions they want to watch and see the entire schedule. I was wondering if it was available as open source since it has some good UI design and usability patterns.

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• Is it possible to have multiple tab-bar controllers in an app?

  - by Sheehan Alam

  I would like to design an app that has a RootView with 4 buttons. Clicking on each button will load another view that has its own tab-bar controller. The tab-bar controller for each of the views is different. If so, how do I go about implementing this?

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• Help me choose between XML or SQL Lite on android

  - by Ngetha

  I have an android app that periodically, say once a week downloads content from a server in XML. The content is used by the app, different Acitivities use different parts of the content. My question is a design one, should I save the data in SQlite or just keep it as an XML file, which one would be faster to read? The app can only use one content piece at a time, which means subsequent XML content downloads replace the old one.

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• web: How can I place an input box in a picture?

  - by Gal Miller

  I want to use a picture as my website design. It's a plain one, like google's. <img src... done... > now, I want to place an input box at the text area of the picture, how to I do that?

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• Crystal Report displaying Group Header multiple times

  - by Ravi Gupta

  Hi I am using Crystal Reports 10 to generate my reports. In one of the reports I see that a group header is getting repeated 2 times in the output document while in the design tab I can that it is present only one time. I am having my query as a "Union All" of 2 data sets. Please advise what could be the cause. Thanks.

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