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• Question about varrying top margin when using custom Fonts on the iPhone.

  - by user170030

  I am using FontLabel to display varying lengths of texts in a custom font. I size the FontLabel using the following : CGSize size = [myString sizeWithFont:[UIFont systemFontOfSize:[[[UIApplication sharedApplication] delegate] getFontSize]] constrainedToSize:CGSizeMake(290, 4000) lineBreakMode:UILineBreakModeWordWrap]; For some reason, this always presents a Fontlabel where the text starts at a different space from the top. Sometimes the text begins at the correct location. Other times, it appears either too high or too low. Would appreciate some help in how to solve this issue.

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• Using locks inside a loop

  - by Xaqron

  // Member Variable private readonly object _syncLock = new object(); // Now inside a static method foreach (var lazyObject in plugins) { if ((string)lazyObject.Metadata["key"] = "something") { lock (_syncLock) { if (!lazyObject.IsValueCreated) lazyObject.value.DoSomething(); } return lazyObject.value; } } Here I need synchronized access per loop. There are many threads iterating this loop and based on the key they are looking for, a lazy instance is created and returned. lazyObject should not be created more that one time. Although Lazy class is for doing so and despite of the used lock, under high threading I have more than one instance created (I track this with a Interlocked.Increment on a volatile shared int and log it somewhere). The problem is I don't have access to definition of Lazy and MEF defines how the Lazy class create objects. My questions: 1) Why the lock doesn't work ? 2) Should I use an array of locks instead of one lock for performance improvement ?

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• Faster way to compare two sets of points in N-dimensional space?

  - by Amit

  List1 contains a high number (~7^10) of N-dimensional points (N <=10), List2 contains the same or fewer number of N-dimensional points (N <=10). My task is this: I want to check which point in List2 is closest (euclidean distance) to a point in List1 for every point in List1 and subsequently perform some operation on it. I have been doing it the simple- the nested loop way when I didn't have more than 50 points in List1, but with 7^10 points, this obviously takes up a lot of time. What is the fastest way to do this? Any concepts from Computational Geometry might help?

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• Microphone input

  - by George

  I'm trying to build a gadget that detects pistol shots using Android. It's a part of a training aid for pistol shooters that tells how the shots are distributed in time and I use a HTC Tattoo for testing. I use the MediaRecorder and its getMaxAmplitude method to get the highest amplitude during the last 1/100 s but it does not work as expected; speech gives me values from getMaxAmplitude in the range from 0 to about 25000 while the pistol shots (or shouting!) only reaches about 15000. With a sampling frequency of 8kHz there should be some samples with considerably high level. Anyone who knows how these things work? Are there filters that are applied before registering the max amplitude. If so, is it hardware or software? Thanks, /George

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• How can I implement lazy loading on a page with 500+ images?

  - by Fedor

  I basically have a booking engine unit results page which must show 40 units and per each unit there's 1 large image of the first thumbnail and an X number of accompanying thumbnail images. I've been using the jquery lazy load plugin, but it's not thorough enough ( I'm invoking it on DOM Ready ), plus it doesn't really work in IE ( 50% of the clients use IE so it's a big issue ). What I think I really need to do is not really spit out the image but a fake element such as a span, and possibly modify my code such that if the user views the span, render it into an image element. <span src="/images/foo.gif"> The booking engine relies on JS so I think I might be forced to just rely on ajaxifying all the thumbnails and have event handlers on window scroll, etc in order for the page to be "usable" and load at an average time ( 2-3 seconds instead of 5-30s on high speed DSL/Cable ). I'd appreciate any examples or ideas.

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• Creating an Application to Save Arbitrary Application State

  - by ashes999

  See this SuperUser question. To summarize, VM software lets you save state of arbitrary applications (by saving the whole VM image). Would it be possible to write some software for Windows that allows you to save and reload arbitrary application state? If so (and presumably so), what would it entail? I would be looking to implement this, if possible, in a high-level language like C#. I presume if I used something else, I would need to dump memory registers (or maybe dump the entire application memory block) to a file somewhere and load it back somewhere to refresh state. So how do I build this thing?

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• How to get REALLY fast python over a simple loop

  - by totallymike

  I'm working on a spoj problem, INTEST. The goal is to specify the number of test cases (n) and a divisor (k), then feed your program n numbers. The program will accept each number on a newline of stdin and after receiving the nth number, will tell you how many were divisible by k. The only challenge in this problem is getting your code to be FAST because it k can be anything up to 10^7 and the test cases can be as high as 10^9. I'm trying to write it in python and having trouble speeding it up. Any ideas? import sys first_in = raw_input() thing = first_in.split() n = int(thing[0]) k = int(thing[1]) total = 0 i = 0 for line in sys.stdin: t = int(line) if t % k == 0: total += 1 print total

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• Where should I define Enums?

  - by Ciel

  Hi: I'm setting up a new app, with a Repository layer/assembly, a Services layer/assembly, and a UI assembly. So I end up with namespaces such as: App.UI App.Biz.Services App.Data.Repositories And then I have enums for the args that are used by all 3 layers. Only place that makes sense is to put them in the Cross cutting assembly. (define them in Data layer too low, as UI should have no direct ref to them, defined in Services, too high for Repository layer, which shouldn't be referencing upwards). But...which namespace in Common? Namespaces should mostly be used to define concerns, rather than Type... I've always used something like: namespace App.Common.Enums {...} but it's always felt a bit of a hack that works for me, but not well in a large org where everybody is generating Enums, and if we put them all in Enums folder it's going to make the code folder harder to understand later. Any suggestions?

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• cross domain gwt ?

  - by jlo

  is there a way to run gwt on a proxy loaded web page ? ex) using proxy script on myexamplesite.com that loads finance.google.com, and running GWT on the newly loaded page. I've been doing the above before I found about GWT, using LAMP stack + Jquery (UI), which quickly turned out to be crap and inefficient. All this trouble to bypass browser's default Single Origin Policy. So, right now, is it possible to overcome this problem with GWT ? Is it possible to some how, run javascript on a html page from finance.google.com loaded into myexamplesite.com's frame with GWT or other solution? I am not looking to do JSON or RSS related topics. What I need is high lighted in bold. Is GWT + Gears what I should be using ? Thank you.

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• Switching from C++ (with a lot of STL use) to C for interpreter building

  - by wndsr

  I'm switching from C++ to C because I'm rebuilding my toy interpreter. I was used to vectors for dynamic allocation of objects like tokens or instructions of my programs, stacks and mainly strings with all their aspects. Now, in C I'm not going to have all these anymore. I know that I will have to use a lot of memory management, too. I'm completely new to C, I only know the high-level easy-life data structures from the STL, how can I get started with strings and dynamic memory allocation?

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• MVC framework for huge JEE application

  - by chaKa

  Which MVC-framework is the best option (performance/ease of development) for a web application, that will have + 2 million visits per week. Basically the site is a search engine,but also there will be large amounts of xml parsing, and high db traffic. We are using Java, over Jboss 4.2.3x, with PG as DB, and Solr for the searches. We were thinking on code JSPs with taglibs, and Servlets, but we were feeling like there would be a better alternative, which don't know yet, as we are starting on the Java Web applications world. Any opinions, and shares of your experience will be appreciated! Thanks in advance!

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• Mysql Master Slave Replication on Large Database table (how to sync initial data)

  - by Brian Lovett

  We have a production server and a dev server. We have found that backups are nearly impossible on the production server because of the query volume we experience. So, we're looking at setting up replication with our dev server being the slave. This is ideal because we can afford to lock the tables on that server and additionally it will be nice to have up to date data for the developers. Now, the issues. The production server can't really be taken down or locked at this point, at least not easily. We have a high query volume and fairly large 30+ GB innodb tables. Both servers are running all innodb and are also both on mysql 5.1. What can we do to sync the data initially to get replication started? I've tried a few options, but so far, none have worked.

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• Declaring variables for limited scope at the head of the for loop

  - by Helper Method

  In Java, you sometimes do something like this: for (int a = 1, b = 2; b < high;) { if (b % 2 == 0) { result += b; } int tmp = b; b = a + b; a = tmp; } Here, I used a for loop instead of a while loop to limit the scope of a and b. But how can I achieve this in JavaFX? The for loop doesn't seem to offer this possibility. Do I have to use a while loop?

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• How to write a tool, inverting colors in Windows?

  - by vlood

  I read a topic in this site about it, but decided to post another one as I want to write such a tool, but I don't have much experience in C# & .NET, so it could take me too much time just digging the Net, while someone can just direct me to the right library or classes to be used. So, straight to the point. I want to write a tool that, when activated, inverts absolutely all items on the screen and lets you work that way without torturing your eyes with bright light colors. Does anyone have an idea of the needed .NET libraries or third-party frameworks, to implement this? Any help will be greatly appreciated! P.S. Changing to "High Contrast" theme in Windows is not the solution I seek, so please, don't mention it!

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• Jquery Slider PNG black borders IE8

  - by Thomas

  Greetings, I'm having a lot of trouble with the IE8 buy of getting black borders when using a JQUERY slider, with PNG transparent images. Using a slightly modified version of the Nivio slider. I have searched high and low for fixes and blocks of code but so far none have worked. What happens is that as soon as the img cycles it gets the black border and looks like shit (only in IE8). Does anyone know a working fix for this? Or do we just have to ban IE from all computers?

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• Save application preferences... registry/file?

  - by spender

  Where is the best place to store application preferences? In particular, I'd like to save preferences for a media player such as volume levels and the like. Two candidates spring to mind... file and registry. Which would be more appropriate? As a follow up to this, I'm also wondering if there are any APIs that aid in creating application specific settings. Unless someone advises me that this is wrong, I'd like to save stuff either in HKCU... or HKLM/Software/MyCompanyName/MyAppName/Key for the registry, or in %APPDATA\MyCompanyName\MyAppName\someTypeOfSettingsFile. As these seem to be commonly used for such settings, I'd assume that .Net makes it easy to store settings in these locations. Is there a simple high level API that can .Net offer me to read and write settings to these common locations?

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• Layering of CSS with z-index

  - by Matt Hintzke

  I have a created a 3 circle venn diagram using pure CSS3 and each circle has a :hover event attached to it. I also have an image of an arrow which is pointing to the center of the venn diagram. I want the arrow to visually appear to be on top of the circles, so I put the z-index higher on the arrow than the circles. The problem now, is that the :hover event does not trigger on half of the venn diagram now because the arrow image is on top, which causes the hover to be on top of the arrow rather than the circle that I want it to be over. So is it possible to make an element have a high z-index visually but not programmatically?

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• Browser App - RAD UI Development - Is it possible?

  - by Randy Minder

  I've been away from building browser applications for a long time. I'm now interested in creating one for a hobby of mine. I dread having to deal with HTML, JavaScript etc. to build a high quality browser based user interface. I've got the full suite of Telerik controls. Is it possible to build a polished, somewhat feature rich browser UI while being sheltered from the archaic environment of HTML and JavaScript? I'd love to be able to simply drag-drop components, much like building a Win UI and have the exact HTML, JavaScript code created for me. Thanks!

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• to avoid page refresh during button click event in asp.net

  - by ush

  public partial class _Default : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { if (!IsPostBack) // If page loads for first time { Session["update"] = Server.UrlEncode(System.DateTime.Now.ToString()); // Assign the Session["update"] with unique value //=============== Page load code ========================= //============== End of Page load code =================== } } protected void Button1_Click(object sender, EventArgs e) { if (Session["update"].ToString() == ViewState["update"].ToString()) // If page not Refreshed { //=============== On click event code ========================= Label1.Text = TextBox1.Text; //lblDisplayAddedName.Text = txtName.Text; //=============== End of On click event code ================== // After the event/ method, again update the session Session["update"] = Server.UrlEncode(System.DateTime.Now.ToString()); } else // If Page Refreshed { // Do nothing } } protected override void OnPreRender(EventArgs e) { ViewState["update"] = Session["update"]; } } this is not working for high resolution gradient background

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• Creating a blocked user intercepter in Grails

  - by UltraVi01

  I am working on a social site where users can block other users. Throughout the site --dozens of places, user information is displayed. For example, user comments, reply forms, online user list.. etc etc.. The problem is that given the high number of places user info is displayed, it's becoming very difficult to check each time if that user is blocked. For example: <g:each var="comment" in="${comments}"> <g:if test="!${loggedInUser.blockedUsers.find { it == comment.user}"> show comment </g:if> </g:each> Does Grails provide any functionality that would facilitate creating some kind of filter or intercepter where I could simply exclude blocked users when iterating lists, etc? If not, what would you suggest I do?

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• Does thread pool size keep growing for scheduledthreadpoolexecutor?

  - by Sourajit Basak

  Imagine a situation where tasks are being added to scheduledthreadpoolexecutor. Each of these tasks will keep on running at different periodic intervals. Although all such tasks will not be running at the same time because each is set at different intervals, there may be a situation where a high number of threads are competing for execution. Is there any restriction on total number of threads ? It seems there is a restriction on the total number of idle threads. And does this concept of idle thread imply that long running tasks (thread) may be destroyed and recreated when needed ?

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• Unsafe, super-fast cross-process memory buffer?

  - by John

  Cross-process memory buffers always have some overhead, and my understanding is this is quite high. But what if you're implementing a cross-process render-buffer, this isn't critically important in the same way as other data so are there techniques we can use to get 'raw' access to a chunk of memory from multiple processes, with no safety nets apart from it not crashing? Or do modern operating systems simply not work with unabstracted memory in a way to make this possible? I'm working in C++ but the question applies to Win XP/Vista/7, MacOSX 10.5+ (& Linux less importantly).

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• SQL Analysis Services - Dimension attributes with a "many" cardinality

  - by MonkeyBrother

  I am creating a cube with the following tables: Customer CustomerID, Name Customer Rep CustomerID, RepID Rep RepID, Name The important thing here is that there is a many to many relationship between Reps and Customers. I want to be able to ask the question "How much sales for customers working with rep 'A'?" In the data source view i set up the relationships between both customerid columns and both repid columns. I set up the rep attribute in the dimension builder and when I try to build the cube I get this error: Errors in the high-level relationship engine. the 'Rep' table that is required for a join cannot be reached based on the relationships in the data source view.

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• Blob ID matching over multiple frames in C++ (image analysis)

  - by pollux

  Dear reader, I'm working on a blob matching and tracking library in C++. Currently I'm using openCV to detect blobs and try to match blobs in a new frame by checking the position, velocity and size of the blob. This works quite okay and I'm receiving a high blob match rate (95% or higher). Sometimes blobs fall out of the image or new blobs appear. Now I need to give matched blobs the same ID as they had before. I'm wondering if there are typical or commonly used techniques for doing this. Or even some keywords I can use to google on. Thanks

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• Normal Priority Builds Will Not Build in TFS 2010

  - by 37Stars

  I have two build processes setup in TFS 2010. One build starts when any developer checks code into TFS. The second build runs every night at 12:30am. I can see the builds have a priority of Normal in the queue. However no queued build ever is run until I change the priority to high. They will sit in the queue forever until the priority is changed. It appears there is a normal priority build in the queue that is stuck. However I cannot find it. I can select , , and and not see anything but these builds queued up. I can run them all and the next day I have queued builds again. I say this because I see the Build Service is configured for port 9192, which leads me to believe there is or was another Build Service on port 9191. Any idea how to resolve this issue? Thanks

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