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  • iPhone -- initialization partly by NSKeyedUnarchiver and partly by other means

    - by William Jockusch
    I have an object myObj, which is an instance of a class MyClass. Some of its instance variables always have their initial values passed in by the calling code. Other instance variables will be initialized in one of two ways. For an instanceArray of type NSMutableArray, the possibilities are either instanceArray = [[NSMutableArray alloc]init]; or instanceArray = [someKeyedUnarchiver decodeObjectForKey: kInstanceArrayKey]; The calling code should determine which of the above will be used. Any particular design pattern I should prefer?

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  • Need a Security Scenario for asp.net webservice

    - by Karamafrooz
    I have developed a .Net 3.5 windows forms application. I also want to design a website that has a webservice with multiple Webmethods to query the database on the host machine. I want the webservice to be called ONLY through my winapp and my website! And I don't want any other people to be able to call and use my webservice but only some people who have access to the windows application that I have developed. I need a good security scenario for this! I truly appreciate anyone who can help me because this is my first experience of developing a webservice and I really need it to be as secure as I mentioned!

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  • file path of a MenuItem target with cmdOpen action

    - by maranas
    I am trying to acquire the file path of an item within the NSMenuItem object. Using [objectname action] i am able to properly acquire the action (cmdOpen). But [objectname target] returns a null value. According to the documentation in the apple developer website, if the value is null, the action is sent to the first-responder. I want to be able to dynamically access the file path of the target file. Is there a way to do this without changing the program design?

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  • UITextFields losing values after UINavigationController activity

    - by Dan Ray
    This is going to be hard to demonstrate in code, but maybe you can picture it with me. I have a view that contains two UITextFields, "title" and "descr". That same view contains two UIButtons that push another controller onto the navController to get more detail from the user about the object we're assembling and ultimately uploading to my server. It appears that pushing another view on, doing something, and popping it back off results in the two UITextFields keeping their content VISUALLY, but the .text property of those fields becomes NULL. I've confirmed that if I do my two push-pop fields before filling in those UITextFields, I get my data when I upload, and if I do them in the opposite order, I don't. It LOOKS like there's data there, but I get nothing when I NSLog their .text properties. Is this normal? Do I need to just design around this? Or is this as weird as it seems, and I should be looking deeper at causes of this?

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  • Measuring Programmers' Productivity. Bad, good or invasive?

    - by Fraga
    A client needs my company to develop an app that will be able to measure the programmer productivity, by getting information from VS, IE, SSMS, profiler and VMware. For example: Lines, Methods, Classes (Added, Deleted, Modified) How many time spent in certain file, class, method, specific task, etc. How many time in different stages of the development cycle (Design, Coding, Debugging, Compiling, Testing) Real lines of code. Etc They told me they want to implement PSP. Would you resign if a company wants to measure this way? OR Would you install this kind of software for self improvement?

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  • Android back button does not restart activity?

    - by Chris
    My app intiates an activity. On the click of a button, the app opens up the browser with a webpage. When I hit the back button, it comes back to my initial activity screen, but does not resume or restart the activity. When I put all the layout code and activity code in onResume instead of onCreate, the activity gets restarted. My question is whether this is the right way to go about it? Can I use onResume to draw my layout and initiate the activity, or is this poor design? When the browser fires up, does the initial activity forget its layout? Please let me know what you suggest. Thanks Chris

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  • When to use CouchDB vs RDBMS

    - by Andrew Whitehouse
    I am looking at CouchDB, which has a number of appealing features over relational databases including: intuitive REST/HTTP interface easy replication data stored as documents, rather than normalised tables I appreciate that this is not a mature product so should be adopted with caution, but am wondering whether it is actually a viable replacement for an RDBMS (in spite of the intro page saying otherwise - http://couchdb.apache.org/docs/intro.html). Under what circumstances would CouchDB be a better choice of database than an RDBMS (e.g. MySQL), e.g. in terms of scalability, design + development time, reliability and maintenance. Are there still cases where an RDBMS is still clearly the right choice? Is this an either-or choice, or is a hybrid solution more likely to emerge as best practice?

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  • Graphical Programming Language

    - by prosseek
    In control engineering or instrumentation, I see Simulink or LabVIEW(G) is pretty popular. In ESL design, I see that Agilent SystemVue is gaining some popularity. If you see the well established compiler theroy, almost 100% is about the textual language. But how about the graphical language? Is there any noticable research or discussion about the graphical programming language? In terms of Theory about Graphical Language - syntactic/semantic analysis and whatever relevant expressiveness (Actually, I asked a question about it at SO - http://stackoverflow.com/questions/2427496/what-do-you-mean-by-the-expressiveness-in-programming-lanuguage) Possibility of the Graphical language ... Or what do you think about the Graphical Programming Language?

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  • What is the correct way to specify dimensions in DIP from Java code ?

    - by Pavel Lahoda
    Trying to digest docs about design Multiple resolutions (http://d.android.com/guide/practices/screens_support.html#dips-pels) I found that it is possible to set dimensions of my interface elements in XML layouts using DIPs as in following fragment : "android:layout_width="10dip" But all Java interface takes integer as arguments and there is no way to specify dimensions in DIPs. What is the correct way to calculate this ? I figured that I have to use property density of DisplayMetrics class but is this a correct way ? May I relly that formula : pixels * DisplayMetrics.density = dip is always correct ? Will there be API in DIPs for Java ?

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  • Sending message from working non-gui thread to the main window

    - by bartek
    I'm using WinApi. Is SendMessage/PostMessage a good, thread safe method of communicating with the main window? Suppose, the working thread is creating a bitmap, that must be displayed on the screen. The working thread allocates a bitmap, sends a message with a pointer to this bitmap and waits until GUI thread processes it (for example using SendMessage). The working thread shares no data with other threads. Am I running into troubles with such design? Are there any other possibilities that do not introduce thread synchronizing, locking etc. ?

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  • Very long strings as primary keys in a database for caching

    - by Bill Zimmerman
    Hi, I am working on a web app that allows users to create dynamic PDF files based on what they enter into a form (it is not very structured data). The idea is that User 1 enters several words (arbitrary # of words, practically capped of course), for example: A B C D E There is no such string in the database, so I was thinking: Store this string as a primary key in a MySQL database (it could be maybe around 50-100k of text, but usually probably less than 200 words) Generate the PDF file, and create a link to it in the database When the next user requests A B C D E, then I can just serve the file instead of recreating it each time. (simple cache) The PDF is cpu intensive to generate, so I am trying to cache as much as I can... My questions are: Does anyone have any alternative ideas to my approach What will the database performance be like? Is there a better way to design the schema than using the input string as the primary key?

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  • Common programming mistakes for Scala developers to avoid

    - by jelovirt
    In the spirit of Common programming mistakes for Java developers to avoid? Common programming mistakes for JavaScript developers to avoid? Common programming mistakes for .NET developers to avoid? Common programming mistakes for Haskell developers to avoid? Common programming mistakes for Python developers to avoid? Common Programming Mistakes for Ruby Developers to Avoid Common programming mistakes for PHP developers to avoid? what are some common mistakes made by Scala developers, and how can we avoid them? Also, as the biggest group of new Scala developers come from Java, what specific pitfalls they have to be aware of? For example, one often cited problem Java programmers moving to Scala make is use a procedural approach when a functional one would be more suitable in Scala. What other mistakes e.g. in API design newcomers should try to avoid.

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  • android: customized text selector

    - by Yang
    I wanted to design a customized text selector that changed the text color when user clicks the TextView. But got the following error: java.lang.RuntimeException: Unable to start activity ComponentInfo{}: android.view.InflateException: Binary XML file line #55: Error inflating class here is what I have: res/text_selector.xml <selector xmlns:android="http://schemas.android.com/apk/res/android"> <item android:state_enabled="false" android:state_focused="true" android:drawable="@color/black" /> <item android:state_pressed="true" android:drawable="@color/blue" /> <item android:state_focused="true" android:drawable="@color/black" /> </selector> layout/textview.xml <TextView android:id = "@+id/last_page_button" android:text="@string/last_page_button_string" android:gravity="center_horizontal" android:layout_width="wrap_content" android:layout_height="wrap_content" android:background="#ffffff" android:textColor = "@drawable/text_selector" android:layout_weight="1" /> values/color.xml <resources> <color name="white">#ffffffff</color> <color name="black">#ff000000</color> <color name="blue">#ffccddff</color>

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  • Getting config element from ConfigurationElementCollection

    - by Martin
    I have (hopefully) setup ConfigurationElementCollection of my own design with emails as keys. Now what? Hard to find actually on the web. How do I: iterate through it? See if a specific element exists? get a specific element? ...given: YourConfigElement config = ConfigurationManager.GetSection("YourSectionName") as YourConfigElement ; Partial answer Does this work? no, sadly. foreach (X x in config.XCollection.AsQueryable()) ...

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  • razor intellisense not working on VS2010 for microsoft.web.helpers

    - by pomarc
    I have VS2010 Premium,.NET4.0, MVC3 Tools Update. I've nugetted microsoft-web-helpers successfully. I cannot get @razor intellisense to recognize the microsoft.web.helpers classes. They do work correctely at runtime, i.e. @Twitter.profile shows a profile, but at design time the statent is seen as an error and no members are shown after "." I've tried to add <add assembly="System.Web.Helpers, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" /> to the <assemblies> element in web.config, but it didn't help. Any idea? thanks.

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  • Component properties working at designtime but not runtime

    - by delphi-rulez-2010
    I am creating a component that uses a collection and collection items of panels. I can't seem to get the colors to work at runtime, but yet they seem to work just fine at design time. You can download the component source code here: http://www.shaneholmes.net/pasfiles/ There is a Consoles (Tcollection) property, status colors property, and a Edit mode property Each console (TCollectionItem) has a status property when changed, the consoles property is changed based on the components StatusColors property. When the components EditMode property is set to true, you can move the panels around at runtime. Question: Why does the colors only work at designtime and not runtime. thanks

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  • Django, javascript and code reuse problem

    - by dragoon
    Hi, I have some sort of a design problem with my Django AJAX application. I have a template where I initialize js variable from django context variable like so: var test = "{{ test }}"; This variable is than used in a number of js functions that are needed for interface to work properly. So now I'm trying to reuse some content from this page in another page that loads it dynamically on some user interaction using jQuery.load(..), and I don't see any way how I can initialize that variable, so js functions don't work now. Is there any solution for this or may be I'm doing it wrong? Thanks.

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  • T-SQL Re-Assigning Order Numbering

    - by Meltdown
    Say I have a table with a field called "ordernum" that denotes the order of a given set of rows. Now imagine that I delete one of these rows. What type of query would work best for re-assigning the order numbers so that they remain sequential? Here's an example: id group_id name ordernum active --------------------------------------------------- 0_____0______'Name1'___5__true 1_____0______'Name2'___4__true 2_____0______'Name3'___3__true 3_____1______'Name4'___2__true 4_____1______'Name5'__1__true 5_____1______'Name6'__NULL___false Now if I deleted the column with id='4' how would I reset the values in the 'ordernum' field for that specific group? Is this even possible? Or if I added a new row. (The first time the rows are created they are sorted by date, but then the user has the option to set the order himself.) In my table design I have a column 'active' boolean. If 'active' is set to false, then 'ordernum' is set to NULL. Otherwise it should be given an order number.

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  • Learning web development as I go

    - by Matt Luongo
    Hey everybody, I've been seriously preparing to take the entrepreneurship leap. I've got a great partner, and we're going to take on some minor funding, and do the thing. Our product is web-based- I'll deem it YAWA (Yet Another Web Application). Both my partner and I have database and web development experience, and I've had a front-end developer in mind for a while. Except, well- he just bowed out. I know a fair amount about the associated technologies (XHTML, CSS, Javascript and some JQuery) interface-side, but I've never had to deal with real-world scenarios, eg cross-browser design. Am I going to be able to survive without this guy? Is it realistic to believe that I can learn the details as I go?

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  • OnPage Load display one sentence - hide others

    - by Paul
    Hi I have created http://techavid.com/design/test3.html and when you load the page you see there are 3 images. The sun image is focused(in color), while the others are greyed out until clicked. That is how it should be for the images. Under each image you see a sentence 1st: Sun, 2nd: Airplane & 3rd: Nano, but when page loads you see all three sentences. How to make it so when page loads the first sentence underneath the active image (sun) shows only and the others do not show, they only show when clicked (though that works just need to figure out onpage load only show "1st: Sun")? thanks :) paul J.

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  • Sequence Diagram Reverse Engineering Tool?

    - by Wayne
    It's essential for me to find a tool that will reverse engineer sequence diagrams by integrating with the debugger. I suppose using the profiler could work also but less desirable. It's a key requirement that the tool in question will record all threads of execution since the app, TickZoom, is heavily parallelized. We just evaluated a most awesome tool from Sparx called Enterprise Architect which integrates with the debugger. It allows you to set a break point, start recording method traces from that break point. It's a lovely design and GUI. Hope it works for you but it only records a single thread of execution so that makes it unusable for us. I will put in a feature request to Sparx. But hope to find a similar tool that already does this since that's the only feature we need--not all the other amazing features that Sparx Enterprise Architect appears to do rather well.

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  • Python Solitaire

    - by Kevin
    This is more of a thought i had awhile rather than an actual problem to solve, maybe more a discussion, but i was wondering if it would be possible to design the game of solitaire and be abkle to play it in the python GUI or some other form of iterface? I know you can get a deck of cards fairly easily and i know yuo can play simple games like snap and so on but i thought solitaire would be more challenging and fun because there is alot more logic behind it than just laying out the cards randomly. Any ideas? (I would be intrested to hear about or see any solutions if anyone had any links etc..)

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  • How to implement multi relationship in MS SQL?

    - by Ethan
    I’m trying to design a database to use with ASP.net MVC application. Here is the scenario: There are three entities and users can post their comments for each of these different entities. I just wonder how just put one table for Comments and link all other entities to it. Obviously, Comments table needs 3 references (foreign key) to those tables but as you know these foreign keys can’t be null and just one of them can be filled for each row. Is there any better way than implementing three different tables for each entity’s comments? Cheers Ethan

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  • Cannot change the Label text!

    - by BDotA
    I have created a custom control and added a label property to it so at design time we can pick a Label and assign it to that control. so basically I want that if a label is assigned to that control, its text should change as below and also its text should change to bold font, so here is that code: private Label assignedLabel; public Label AssignedLabel { get { return assignedLabel; } set { assignedLabel = value; assignedLabel.Text = @"*" + assignedLabel.Text; assignedLabel.Font = new Font(AssignedLabel.Font, FontStyle.Bold); AssignedLabel.Refresh(); } } the problem is that based on the code above the Font of that assigned label is correctly changing to Bold font, but its Text is not taking affect. why is that happening? how can I fix this issue?

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  • Implementing "Generator" support in a custom language

    - by Roger Alsing
    I've got a bit of fettish for language design and I'm currently playing around with my own hobby language. (http://rogeralsing.com/2010/04/14/playing-with-plastic/) One thing that really makes my mind bleed is "generators" and the "yield" keyword. I know C# uses AST transformation to transform enumerator methods into statemachines. But how does it work in other languages? Is there any way to get generator support in a language w/o AST transformation? e.g. Does languages like Python or Ruby resort to AST transformations to solve this to? (The question is how generators are implemented under the hood in different languages, not how to write a generator in one of them)

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