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  • System.Threading.Tasks - Limit the number of concurrent Tasks

    - by James
    I have just started to look at the new "System.Threading.Tasks" goodness in .Net 4.0, and would like to know if there is any build in support for limiting the number of concurrent tasks that run at once, or if this should be manually handled. E.G: If I need to call a calculation method 100 times, is there a way to set up 100 Tasks, but have only 5 execute simultaneously? The answer may just be to create 5 tasks, call Task.WaitAny, and create a new Task as each previous one finishes. I just want to make sure I am not missing a trick if there is a better way to do this. Thanks for any help.

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  • Modal View Controller Undesirably Hides Tab Bar

    - by Kevin Sylvestre
    I am working on an application that requires user authentication to access a profile. The profile section is located solely under one tab (and all others tabs do not require authentication). I currently present a authentication view controller modally (and then dismiss on success) when the user selects the profile tab. However, this approach prevents the user from deciding not to register / login (that is, all tabs are hidden once the authentication screen is presented modally). I don't want the user to be able to dismiss the modal view controller, but rather have it modal only for the profile tab. Is this possible? Can I have tabs visible while having a modal view controller? What is the best approach here. Thanks.

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  • ASP MVC Ajax Controller pattern?

    - by Kevin Won
    My MVC app tends to have a lot of ajax calls (via JQuery.get()). It's sort of bugging me that my controller is littered with many tiny methods that get called via ajax. It seems to me to be sort of breaking the MVC pattern a bit--the controller is now being more of a data access component then a URI router. I refactored so that I have my 'true' controller for a page just performing standard routing responses (returing ActionResponse objects). So a call to /home/ will obviously kick up the HomeController class that will respond in the canonical controller fashion by returning a plain-jane View. I then moved my ajax stuff into a new controller class whose name I'm prefacing with 'Ajax'. So, for example, my page might have three different sections of functionality (say shopping cart or user account). I have an ajax controller for each of these (AjaxCartController, AjaxAccountController). There is really nothing different about moving the ajax call stuff into its own class--it's just to keep things cleaner. on client side obviously the JQuery would then use this new controller thusly: //jquery pseudocode call to specific controller that just handles ajax calls $.get('AjaxAccount/Details'.... (1) is there a better pattern in MVC for responding to ajax calls? (2) It seems to me that the MVC model is a bit leaky when it comes to ajax--it's not really 'controlling' stuff. It just happens to be the best and least painful way of handling ajax calls (or am I ignorant)? In other words, the 'Controller' abstraction doesn't seem to play nice with Ajax (at least from a patterns perspective). Is there something I'm missing?

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  • .NET RegEx "Memory Leak" investigation

    - by Kevin Pullin
    I recently looked into some .NET "memory leaks" (i.e. unexpected, lingering GC rooted objects) in a WinForms app. After loading and then closing a huge report, the memory usage did not drop as expected even after a couple of gen2 collections. Assuming that the reporting control was being kept alive by a stray event handler I cracked open WinDbg to see what was happening... Using WinDbg, the !dumpheap -stat command reported a large amount of memory was consumed by string instances. Further refining this down with the !dumpheap -type System.String command I found the culprit, a 90MB string used for the report, at address 03be7930. The last step was to invoke !gcroot 03be7930 to see which object(s) were keeping it alive. My expectations were incorrect - it was not an unhooked event handler hanging onto the reporting control (and report string), but instead it was held on by a System.Text.RegularExpressions.RegexInterpreter instance, which itself is a descendant of a System.Text.RegularExpressions.CachedCodeEntry. Now, the caching of Regexs is (somewhat) common knowledge as this helps to reduce the overhead of having to recompile the Regex each time it is used. But what then does this have to do with keeping my string alive? Based on analysis using Reflector, it turns out that the input string is stored in the RegexInterpreter whenever a Regex method is called. The RegexInterpreter holds onto this string reference until a new string is fed into it by a subsequent Regex method invocation. I'd expect similar behaviour by hanging onto Regex.Match instances and perhaps others. The chain is something like this: Regex.Split, Regex.Match, Regex.Replace, etc Regex.Run RegexScanner.Scan (RegexScanner is the base class, RegexInterpreter is the subclass described above). The offending Regex is only used for reporting, rarely used, and therefore unlikely to be used again to clear out the existing report string. And even if the Regex was used at a later point, it would probably be processing another large report. This is a relatively significant problem and just plain feels dirty. All that said, I found a few options on how to resolve, or at least work around, this scenario. I'll let the community respond first and if no takers come forward I will fill in any gaps in a day or two.

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  • Facebook Canvas Apps, New API

    - by James
    I'm having some trouble with switching to the new JS API for a number of things with creating applications within FB, specifically the "Tab". <!-- function do_perm() { Facebook.showPermissionDialog('publish_stream,email,offline_access', null); } //--> This no longer works for me when called via an onclick command. Also, with the new API and an FBML app. How does this exactly work? The documentation is really poor so I am confused when looking at the old wiki, and the new developer site. Apologies for being pretty vague, but I'm just generally confused with the lack of clear direction with the new API and help would be greatly appreciated. I'm simply just trying to create a call that prompts for the new style user permission dialog, and oncomplete calls another JS function.

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  • How to optimize this MySQL query

    - by James Simpson
    This query was working fine when the database was small, but now that there are millions of rows in the database, I am realizing I should have looked at optimizing this earlier. It is looking at over 600,000 rows and is Using where; Using temporary; Using filesort (which leads to an execution time of 5-10 seconds). It is using an index on the field 'battle_type.' SELECT username, SUM( outcome ) AS wins, COUNT( * ) - SUM( outcome ) AS losses FROM tblBattleHistory WHERE battle_type = '0' && outcome < '2' GROUP BY username ORDER BY wins DESC , losses ASC , username ASC LIMIT 0 , 50

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  • PHP string manipulation, inside the string

    - by James
    I have string: ABCDEFGHIJK And I have two arrays of positions in that string that I want to insert different things to. Array ( [0] => 0 [1] => 5 ) Array ( [0] => 7 [1] => 9 ) Which if I decided to add the # character and the = character, it'd produce: #ABCDE=FG#HI=JK Is there any way I can do this without a complicated set of substr? Also, # and = need to be variables that can be of any length, not just one character.

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  • ffdshow codec can not work with media play 12 in windows 7 ?

    - by James shen
    The reason of this issue is caused by media player 12 (in windows 7 professional) using mircsoft default codec which don't support mp4 decode. The ffdshow codec can not replace microsoft default codec in windows 7 (windows7 does not allow that in default). I find some third party tools can switch media player default codec to ffdshow but this is really inconvenience for our customer. Is there any way I can make a program to switch microsoft default codec to ffdshow codec? Like change some entries in windows registry?

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  • PECL install fails

    - by James
    Hey! I have browsed every Google result, read all the forum posts about this error, but I cannot solve it. When using PECL install for anything, I always end up getting this error: checking whether the C compiler works... configure: error: cannot run C compiled programs. Everything else succeeds up to that point them bam! I'm using CentOS 4.3, PEAR is the latest stable version, GCC is a stable and recent version. Everything is working as it should, but the C compiler always seems to error. I've tried to make tmp have the right privilages for the operation by temporarily enabling it using: mount -o remount,exec,suid /tmp But that doesn't work. I've literally tried everything that has been suggested by to no avail. Any ideas?

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  • How do I call window.openDatabase from a webView hosted in an android application?

    - by Kevin
    I created a native Android app that basically hosts a webView control. That webView is then used to load a page that calls window.openDatabase from JavaScript. I can successfully confirm that the API exists by verifying window.openDatabase. Calling this method returns a null when called in a hosted webView control. Calling the same method in the Android Browser returns an instance of the database. Does anyone know the permessions in the manifest or settings on the webView control that need to be set to access the database? Is this even possible in a native app.

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  • Is there an extension or a way to write an extension for firefox that allows a developer to refresh

    - by Kevin J
    I'm a developer, and I spend much of my day refreshing the webapps I work on. Occasionally, I'll encounter pages where POST data was submitted, and firefox will prompt me to Resend POST data or to Cancel. Now, I know that I can just redirect a page to itself to get rid of this warning, but I still want to keep this warning for our users; I just want to be able to skip it while developing. It's also not just on one page, but at many different points throughout the app, so it's not like I can just do if $debug==true then redirect or something like that. Basically just a minor convenience issue, but when I encounter the message 50-100 times a day, it can get aggravating. What I want to do is essentially have 3 options when refreshing: Resend POST data, cancel, or refresh without resending POST data The third option would be equivalent to clicking "enter" in the address bar (which is what I end up having to do). The problem with clicking enter is that I often have to "hard refresh" using ctrl+shift+r, but if I do this with POST data I have to click cancel, then click enter on the address bar, then do a hard refresh after that. I would instead like to press ctrl+shift+r, then continue hard refreshing the page without the POST data. Does anyone know how to do this? Through an extension or otherwise? It's totally a minor issue, but it's something that constantly bothers me and I actually think it would be quite a useful option. Thanks

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  • CSS Background-Images Loading after HTML Images (Involves Javascript)

    - by Kevin C.
    I threw together a quick little microsite that you can see at http://monterraauction.com. If you don't have a super-fast connection (and nothing's cached), the very last items to load are the background-images that are used for CSS image-text replacement (primarily, that h1#head at the top, with a 7kb background image). Nothing debilitating, but it looks slightly awkward. And I'm asking this question as a matter of curiosity more than anything else ;) Also, please note that this occurs in Firefox, but not Chrome. Now, underneath the h1#head I have a jquery.cycle.lite-powered slideshow in div#photo. In the HTML markup there are a total of 13, heavy image files that make up each of the slides. If I remove all but the first slide, then the problem goes away! So the CSS background-images are loading after...those HTML images are done? But here's what's confusing: I check it out in YSlow...the CSS background-images have a much lower response time than all of the slides in #photo. Right after all the JS files finish loading, in fact. So why aren't they showing up first? I tried $('#photo img:last-child').load(function() { alert('Locked and Loaded!')});, but the background-images pop up a while before the alert does, so I'm assuming it's not waiting until the last slide has loaded (admittedly I'm a bit of JS noob so maybe I'm just making a wrong assumption). I also tried commenting out all the jquery.cycle.lite stuff, so that I knew I didn't have any JS manipulating the DOM elements in #photo, but that wasn't the problem. I tried putting all the JS at the bottom of the document, right before </body>, but that didn't work. Lastly, I tried turning off javascript, and of course the css background-image loads way before the images in #photo, so it's definitely a JS thing (amirite?) I guess the obvious solution here is to mark the slides up as LINKS rather than IMGs, and have Javascript insert those 12 extra slideshow images after the DOM is ready--users without javascript shouldn't need to download the extra images anyways. But again, I'm curious: Why does removing the extra HTML images from within #photo solve the problem? And why are the CSS background-images showing up after the HTML images have loaded, even though YSlow says the css background-images loaded first? Seeing as how it happens in FF but not Chrome, is it simply a browser issue? I appreciate any insight you guys could give me!

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  • Can I draw Qt objects directly to Win32 DC (Device Context)?

    - by Kevin
    I can draw Qt objects to an QImage and then draw the image to HDC or CDC. This may hurt our application's performance. It would be great if I can draw Qt objects directly to Win32 HDC or MFC CDC. I expect that there is a class, say QWin32Image for clear, then I can use it in this way: QWin32Image image(hdc, 100, 100, Format_ARGB32_Premultiplied); QPainter painter(&image); painter.drawText(....); Is it possible for my thought? Or is there a better way to do that?

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  • Structuremap and generic types

    - by James D
    Hi I have a situation which seems a bit different from others I've seen. For clarrification, this isn't the normal question eg; something like IAClass maps to AClass etc - that involves using basically a single concrete classes per interface. This involves having a single generic class, but I want to be able to load ALL possible usages of it. Eg - the main class is of public class MyClass<TDomainObject> : IMyClass<TDomainObject> where TDomainObject : DomainObject So example usages would be IMyClass<Person> p = new MyClass<Person>; IMyClass<Employer> p = new MyClass<Employer>; I.e. for all DomainObjects I would like to be able to load a MyClass< for. So you can see I don't use a specific class for each declaration, they all use the same one. How would I get this loaded into StructureMap?

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  • FTP server output and accents

    - by James P.
    I've written this little test class to connect up to an FTP server. import java.io.BufferedInputStream; import java.io.IOException; import java.io.InputStream; import java.net.MalformedURLException; import java.net.URL; import java.net.URLConnection; public class FTPTest { public static void main(String[] args) { URL url = null; try { url = new URL("ftp://anonymous:[email protected]"); } catch (MalformedURLException e) { e.printStackTrace(); } URLConnection conn = null; try { conn = url.openConnection(); } catch (IOException e) { e.printStackTrace(); } InputStream in = null; try { in = conn.getInputStream(); } catch (IOException e) { e.printStackTrace(); } BufferedInputStream bin = new BufferedInputStream(in); int b; try { while ((b = bin.read()) != -1) { char c = (char) b; System.out.print("" + (char) b); } } catch (IOException e) { e.printStackTrace(); } } } Here's the output: -rw-r--r-- 1 ftp ftp 4700 Apr 30 2007 premier.java -rw-r--r-- 1 ftp ftp 88576 Oct 23 2007 Serie1_1.doc -rw-r--r-- 1 ftp ftp 1401 Nov 21 2006 tp20061121.txt drwxr-xr-x 1 ftp ftp 0 Apr 23 20:04 répertoire Notice the name of the directory at the end of the list. There should be an "é" (e with acute accent) instead of the double character "é". This reminds me of an issue encountered previously with JSF where there was a mix-up between standards. I have little experience with character-encoding though so I'm not sure what's happening. I'm supposing that the server output is in ASCII so how do I adapt the output so it appears correctly in the console?

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  • Marshalling C# com items when using recursion

    - by Kevin
    I am using the SourceSafe COM object (SourceSafeTypeLib) from C# to automate a SourceSafe recursive get (part of a larger build process). The recursive function is shown below. How do I ensure that all the COM objects created in the foreach loop get released correctly? /// <summary> /// Recursively gets files/projects from SourceSafe (this is a recursive function). /// </summary> /// <param name="vssItem">The VSSItem to get</param> private void GetChangedFiles(VSSItem vssItem) { // 'If the object is a file perform the diff, // 'If not, it is a project, so use recursion to go through it if(vssItem.Type == (int)VSSItemType.VSSITEM_FILE) { bool bDifferent = false; //file is different bool bNew = false; //file is new //Surround the diff in a try-catch block. If a file is new(doesn't exist on //the local filesystem) an error will be thrown. Catch this error and record it //as a new file. try { bDifferent = vssItem.get_IsDifferent(vssItem.LocalSpec); } catch { //File doesn't exist bDifferent = true; bNew = true; } //If the File is different(or new), get it and log the message if(bDifferent) { if(bNew) { clsLog.WriteLine("Getting " + vssItem.Spec); } else { clsLog.WriteLine("Replacing " + vssItem.Spec); } string strGetPath = vssItem.LocalSpec; vssItem.Get(ref strGetPath, (int)VSSFlags.VSSFLAG_REPREPLACE); } } else //Item is a project, recurse through its sub items { foreach(VSSItem fileItem in vssItem.get_Items(false)) { GetChangedFiles(fileItem); } } }

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  • Visual Studio 2008 "Publish" option generates some empty folders

    - by Kevin Pang
    When I right click an ASP.NET MVC solution and select the "Publish" option, the final output it generates contains several empty top-level folders. For instance, the "Service References" folder that gets automatically added when you add a service reference to a web app is generated without any files in it. Why are these folders generated at all if there's no content in them? Is there a way to let Visual Studio know to not bother publishing them? This isn't a big deal since it doesn't really affect the app (and before deploying I can always delete the empty folders), but it's a little annoying.

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  • Using hibernate criteria, is there a way to escape special characters?

    - by Kevin Crowell
    For this question, we want to avoid having to write a special query since the query would have to be different across multiple databases. Using only hibernate criteria, we want to be able to escape special characters. This situation is the reason for needing the ability to escape special characters: Assume that we have table 'foo' in the database. Table 'foo' contains only 1 field, called 'name'. The 'name' field can contain characters that may be considered special in a database. Two examples of such a name are 'name_1' and 'name%1'. Both the '_' and '%' are special characters, at least in Oracle. If a user wants to search for one of these examples after they are entered in the database, problems may occur. criterion = Restrictions.ilike("name", searchValue, MatchMode.ANYWHERE); return findByCriteria(null, criterion); In this code, 'searchValue' is the value that the user has given the application to use for its search. If the user wants to search for '%', the user is going to be returned with every 'foo' entry in the database. This is because the '%' character represents the "any number of characters" wildcard for string matching and the SQL code that hibernate produces will look like: select * from foo where name like '%' Is there a way to tell hibernate to escape certain characters, or to create a workaround that is not database type sepecific?

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