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• Virtual camera/direct show filter for network stream

  - by Jeje

  Hi guys, i'm working with Flash Live Encoder. It's using camera for streaming video. Support forum say's that i can create custom direct show filter and stream data that i need. I cann't understand how direct show filter will display in the source list of the live encoder. I've tryed to use some commercial virtual camera and it work's fine, but it cann't use source from network stream. Summary. I have a several network streams. I think that i must to create virtual camera for each one. But if i find examples with direct show filter on C#, i cann't find for virtual camera.

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• Spring - disable bind exceptions (for a particular property)

  - by Walter White

  Hi all, In a web application I'm working on using Spring 2.5.6.SEC01, I essentially have an Integer field that takes a number to determine which page to scroll to. The requirements changed, and we no longer want to display an error message, but simply ignore the user's input if they enter an invalid number, say "adfadf". I was reading that you can do that via: TypeMismatch.property=Some New Error Message However, after having tried that, we are still getting the original error message: java.lang.Integer.TypeMismatch=... I only want to disable this message for that given property. How can I do that? I still want binding to occur automatically, I just don't want to hear about it now. Walter

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• How doe we name test methods where we are checking for more than one condition?

  - by Sandbox

  I follow the technique specified in Roy Osherove's The Art Of Unit Testing book while naming test methods - MethodName_Scenario_Expectation. It suits perfectly well for my 'unit' tests. But,for tests that I write in 'controller' or 'coordinator' class, there isn't necessarily a method which I want to test. For these tests, I generate multiple conditions which make up one scenario and then I verify the expectation. For example, I may set some properties on different instances, generate an event and then verify that my expectations from controller/coordinator is being met. Now, my controller handles events using a private event handler. Here my scenario is that, I set some properties, say 3 condition1,condition2 and condition3 Also, my scenario includes an event is raised I don't have a method name as my event handler is private. How do I name such a test method?

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• google search as an rss feed

  - by Jonathan

  Hi guys, Is there a way to have treat google serach results as an rss feed? For example say I worked for stackoverflow and wanted to montior how if the results from the following search url: http://www.google.com/search?hl=en&q=stackoverflow changes from day today. It would be cool if I could append &output=rss to the url and get back a feed like with google news. But that does not seem to be supported. Anyone have ideas? (Note I am programing with Ruby and Rails, if that matters) Thanks! Jonathan

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• Create jQuery Slider Range With One Handle Not Using Min/Max

  - by David Savage

  Hey all, Is there any possible way to create a slider that will create a range similar to what is done with one handle using min/max, only instead of min/max, starting the range from say 50 (on a scale from 1-100)? I realize this will most likely require modification of the slider or creating a plugin, just wondering if anyone has done this already or knows how to go about it. I.e. something like this: http://jqueryui.com/demos/slider/rangemin.html Only, instead of the range going from the min, going off of where the handle is, and allowing the user to slide either left or right of that fixed starting point to create the range. Any help is appreciated, and I'd be glad to clarify what I need if that doesn't make sense! :)

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• what's the story with the android XML namespace?

  - by Peter vdL

  When you first use a name from the android XML namespace, you have to say where to find it, with an attribute in XML like this: <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" However, that URL is a 404 - nothing found there. The android: namespace is actually included under the locally-installed SDK. So what's going on here? Why do I need to include a dead URL? Why doesn't the build system pick it up from the SDK like all the other libraries? Thanks, just looking for the back story on this. Peter

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• C++ defines for a 'better' Release mode build in VS

  - by darid

  I currently use the following preprocessor defines, and various optimization settings: WIN32_LEAN_AND_MEAN VC_EXTRALEAN NOMINMAX _CRT_SECURE_NO_WARNINGS _SCL_SECURE_NO_WARNINGS _SECURE_SCL=0 _HAS_ITERATOR_DEBUGGING=0 My question is what other things do fellow SOers use, add, define, in order to get a Release Mode build from VS C++ (2008,2010) to be as performant as possible? btw, I've tried PGO etc, it does help a bit but nothing that comes to parity, also I'm not using streams, the C++ i'm talking about its more like C but making use of templates and STL algorithms. As it stands now very simple code segments flop when compared to what GCC produces on say an equivalent x86 machine running linux (2.6+ kernel) using 02. Side-Note: I believe a lot of the issues relate directly to the STL version (Dinkum) provided by MS. Could people please elaborate on experiences using STLPort etc with VS C++.

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• Ordering the calling of asynchronous methods in c#

  - by Peter Kelly

  Hi, Say I have 4 classes ControllerClass MethodClass1 MethodClass2 MethodClass3 and each MethodClass has an asynchronous method DoStuff() and each has a CompletedEvent. The ControllerClass is responsible for invoking the 3 asynchronous methods on the 3 MethodClasses in a particular order. So ControllerClass invokes MethodClass1.DoStuff() and subscribes to MethodClass1.CompletedEvent. When that event is fired, ControllerClass invokes MethodClass2.DoStuff() and subscribes to MethodClass2.CompletedEvent. When that event is fired, the ControllerClass invokes MethodClass3.DoStuff() Is there a best practice for a situation like this? Is this bad design? I believe it is because I am finding it hard to unit test (a sure sign) It is not easy to change the order I have an uneasy, code-smell feeling about it What are the alternatives in a situation like this?

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• Pushing a variable onto a vector, value at that point in vector changes when the variable does.

  - by David Andrews

  I have a programming problem =) std::vector<char*> Names; if(MyPacket.ID == 3) {Names.push_back(MyPacket.Buffer);} I push the recieved buffer onto a vector like so, but when the buffer changes so does the value of the variable at that point in the vector. So say I sent and pushed a buffer containing 'Simon' onto the vector that would be fine so at point [0] on the vector would be the word Simon. but then when I recieve a new buffer it overwrites position [0] even though the packets ID is different, a breakpoint within the if statement is not reached with this new buffer. I really hope i'm explaining this well enough, I tried asking a friends advice and he pointed me towards this site. Any help appreciated David Andrews

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• Can I use the CSS :visited pseudo class on 'wildcard' links?

  - by rabidpebble

  Let's say I have a site with multiple links as follows: www.example.com/product/1 www.example.com/product/2 www.example.com/product/3 I also append tracking info to links from time to time so that I can see how my site is being used, e.g, if somebody visits the products page from the product browser I would set a ref parameter: www.example.com/product/1&ref=pb www.example.com/product/2&ref=pb www.example.com/product/3&ref=pb The problem with this is that if the user visits a link of the first type and then views a link of the second type then the :visited pseudo class doesn't seem to apply because the browser only seems to match on exact URLs. Is there any way to have "wildcards" apply to links in this sense, so that when the user sees either the first type or the second type of link that it is highlighted? Note: I cannot change this "ref" architecture; it is inherited.

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• Get country location of an IP with native PHP

  - by Mint

  Read on before you say this is a duplicate, it's not. (as far as I could see) I want to get the county code in php from the client. Yes I know you can do this using external sites or with the likes of "geoip_record_by_name" but I don't want to be dependent on an external site, and I can't install "pear" for php as im using shard Dreamhost hosting. I thought I could just do something like this: $output = shell_exec('whois '.$ip.' -H | grep country | awk \'{print $2}\''); echo "<pre>$output</pre>"; But dreamhost seems to have an old version of whois (4.7.5), so I get this error on allot of IPs: Unknown AS number or IP network. Please upgrade this program. So unless someone knows how to get a binary of a newer version of whois onto dreamhost im stuck. Or is there another way I could get the country code from the client who is loading the page?

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• shared_ptr requires complete type; cannot use it with lua_State*

  - by topright

  Hello! I'm writing a C++/OOP wrapper for Lua. My code is: class LuaState { boost::shared_ptr<lua_State> L; LuaState(): L( luaL_newstate(), LuaState::CustomDeleter ) { } } The problem is lua_State is incomplete type and shared_ptr constructor requires complete type. And I need safe pointer sharing. (Funny thing boost docs say most functions do not require complete type, but constructor requires, so there is no way of using it. http://www.boost.org/doc/libs/1_42_0/libs/smart_ptr/smart_ptr.htm) Can can I solve this? Thank you.

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• Voting software with remote units - architectural questions

  - by David Neale

  I'm looking at designing some software that registers live votes (let's say A,B,C or D). The vote needs to be picked up and processed by a .NET engine. The remote voting units should be as small as possible. What form of data transmission should be used for the voting? The data is obviously very simple but there is a need to make sure each unit can only vote once per question. How would the data be received by the computer running the software?

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• DataView Vs DataTable.Select()

  - by Aseem Gautam

  Considering the code below: Dataview someView = new DataView(sometable) someView.RowFilter = someFilter; if(someView.count > 0) { …. } Quite a number of articles which say Datatable.Select() is better than using DataViews, but these are prior to VS2008. Solved: The Mystery of DataView's Poor Performance with Large Recordsets Array of DataRecord vs. DataView: A Dramatic Difference in Performance So in a situation where I just want a subset of datarows based on some filter criteria(single query) and what is better DataView or DataTable.Select()?

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• How does operating system software maintains time clocks?

  - by Neeraj

  Hi everyone, This may sound a bit less relevant but I couldn't think of a better place to ask this question. Now consider this situation, you install an OS on your system, set the timezone and time, do some stuff and turn it off. (Note that there is no power going in to the computer). Now next time (say after some hours or days) you turn it on again, and you see the updated time. How is this possible even when my computer is not connected to the internet and was consuming no power during the period it was down.(Is there some kind of hardware hack?) please clarify!

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• Can I add custom methods/attributes to built-in Python types?

  - by sfjedi

  For example—say I want to add a helloWorld() method to Python's dict type. Can I do this? JavaScript has a prototype object that behaves this way. Maybe it's bad design and I should subclass the dict object, but then it only works on the subclasses and I want it to work on any and all future dictionaries. Here's how it would go down in JavaScript: String.prototype.hello = function() { alert("Hello, " + this + "!"); } "Jed".hello() //alerts "Hello, Jed!" Here's a useful link with more examples— http://www.javascriptkit.com/javatutors/proto3.shtml

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• Is it possible to change where things are in Chrome's Developer Tools Script panel?

  - by T.J. Crowder

  When debugging browser-based apps using Google Chrome's Developer Tools, is there a way to change the locations of the various panes? Specifically in the Scripts panel (though I suppose it's a general question). E.g., the Watch Expressions, the Call Stack, the code pane, etc.? The defaults are okay (console at bottom, code pane upper left, a column of Watch Expressions, Call Stack, Scope Vars, etc. in the upper right), but I'd rather swap things around a bit if it's possible. There doesn't seem to be anything to grab (other than for sizing) and I haven't found a way in my searching so far, but there are (still) some things about Chrome's options that aren't ... well-advertised in the UI, shall we say :-), especially around developer tools.

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• Bitmap files added in .rc not listed in resource.h

  - by ame

  I added a large number of bitmap files to my MFC project in resource view (Visual Studio). However, the resource.h file does not list any of these files. I would want them to be listed with exactly the same name as they are added in .rc bitmap list (say the name is xxx) I want it listed as #define IDB_xxx If I try to click on the bitmap in the .rc list and import it, it gets listed as IDB_BITMAP1. Owing to the large number of files it is not feasible for me to manually rename them for use in my code.

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• Instant Messenger: How does gtalk/yahoo messenger populate the contact list?

  - by Owen

  Hi All, We are currently working on a small IM project which pretty much works like gtalk and yahoo messenger. We came across a problem that puzzled us how gtalk/ym populate their contact lists. Given that the user has let's say more or less 500 contacts, both IMs seem to readily load the contacts pretty fast and already sorted. Here are my questions(referring to either): Does it cache its contacts, like saving it in a file somewhere upon exit so that upon log-in it readily extracts the contacts and displays it in its contact list? Does it always request for the VCARDS upon log in? OR they have a VCARD push or whatever that simply updates the contacts' profiles (like that of their status [presence push - available, busy, etc...] )?

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• using extends with Java Generics

  - by Sandro

  Lets say that I have the following code: public class Shelter<A extends Animal, B extends Animal> { List<A> topFloor = new Vector<A>(); List<B> bottomFloor = new Vector<B>(); public A getFirstTopFloorAnimal(){return topFloor.firstElement();} public B getFirstBottomFloorAnimal(){return bottomFloor.firstElement();} //This compiles but when I try to use it, it only returns objects public List<Animal> getAnimals() { Vector a = new Vector(topFloor); a.addAll(bottomFloor); return a; } } Now for somereason the following code compiles. But when I try to use getAnimals() I get a of objects instead of Animal. Any ideas why this is? Does this have to do with the List is NOT a List idea in the Generics tutorial? Thank you.

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• perl hashes - comparing keys and values

  - by Aaron Moodie

  I've been reading over the perl doc, but I can't quite get my head around hashes. I'm trying to find if a hash key exists, and if so, compare is't value. The thing that is confusing me is that my searches say that you find if a key exists by if (exists $files{$key}) , but that $files{$key} also gives the value? the code i'm working on is: foreach my $item(@new_contents) { next if !-f "$directory/$item"; my $date_modified = (stat("$directory/$item"))[9]; if (exists $files{$item}) { if ($files{$item} != $date_modified { $files{$item} = $date_modified; print "$item has been modified\n"; } } else { $files{$item} = $date_modified; print "$item has been added\n"; } }

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• Erlang Mnesia Equivalent of SQL Select FROM WHERE Field IN (value1, value2, value3, ...)

  - by ErJab

  I have an mnesia table with fields say f1, f2, f3. Now if I were to select all the rows with the field value as V1, I would use mnesia:select and match specifications or a simple mnesia:match_object. Now I need to select all the rows which have V1, V2, V3 ... or Vn (a list of arbitrary length) as the value for field f1. In SQL I would do something like SELECT * FROM tablename WHERE f3 IN (V1, V2, V3, ... , Vn) How do I do this in mnesia?

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• Android: Deciding between SurfaceView and OpenGL (GLSurfaceView)

  - by Rich

  Is there a way to decide up front based on the expected complexity of a game/app in the planning phase whether to use regular Canvas drawing in a SurfaceView or to go with OpenGL? I've been playing around with a Canvas and only need 2D movement, and on a fairly new phone I'm getting pretty decent performance with a bunch of primitive objects and a few bitmaps running around the screen on a solid background. Is it fair to say that if I'm going to be drawing background images and increasing the number of objects being moved and drawn on top of them that I should go straight to OpenGL?

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• How to Prove that using subselect queries in SQL is killing performance of server

  - by adopilot

  One of my jobs it to maintain our database, usually we have troubles with lack of performance while getting reports and working whit that base. When I start looking at queries which our ERP sending to database I see a lot of totally needlessly subselect queries inside main queries. As I am not member of developers which is creator of program we using, they do not like much when I criticize they code and job. Let say they do not taking my review as serious statements. So I asking you few questions about subselect in SQL Does subselect is taking a lot of more time then left outer joins? Does exists any blog, article or anything where I subselect is recommended not to use ? How I can prove that if we avoid subselesct in query that query is going to be faster ? Our database server is MSSQL2005

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• Crystal Reports Legends

  - by AWinters

  Is there a way to force a Bar Chart legend in Crystal Report 11.5 to display its objects in a particular order? For Example, say I am reporting on the consumption of "Bananas" and "Apples" by State. The Bar Chart should display the percentage of people who eat these fruits by county (Percent Bar Chart). The "Apples" percentage always displays on top of the bar chart and the "Bananas" on the bottom. The legend for this graph also displays the "Apple" color first, then the "Banana" color. However, if the "Banana" percentage is 0% the legend displays the "Banana" color first on the legend. This creates a inconsistent report (with plenty of complaints). I would like the "Banana" color to always display second in the legend. Hope I didn't confuse anyone and any ideas would be helpful.

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