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• How to determine if an event is already subscribed

  - by Ram

  Hi, In my .NET application I am subscribing to events from another class. The subscription is conditional. I am subscribing to events when the control is visible and de-subscribing it when it become invisible. However in some conditions I do not want to de-subscribe the event even if the control is not visible as I want the result of an operation which is happening on background thread . Is there any way through which I can determine if a that class has already subscribed to that event. I know we can do it in the class which will raise that event by checking event with null but I don not know how to do it in a class which will subscribe to that event.

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• USB flash drive serial number specification

  - by clyfe

  I retrieve a USB flash drive serial number by means of ioctl HDIO_GET_IDENTITY as described here. Yet, for some flash drives there is no serial (for example my SanDisk Cruzer). Why some drives don not return a serial number? a) HDIO_GET_IDENTITY not implemented in driver ? b) They just don't have one ? c) Other ? (what?) Is there a specification (like IEEE) that describes where and how the serial number is stored inside the flash drive?

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• Specific 'boot file' definition

  - by Jazz

  Hey, I have been given a general explanation of how a computer boots up. However a very loose definition to the term 'boot file' was given. Could someone explain 'boot file' to me in a very simple but concise manner? I have read about the POST, the clearing of registers, BIOS in the CMOS, etc. What I understand is that the boot file is different to the boot program. the boot program gets the system ready to accept an OS while the boot file contains some of the parameters by which the system will operate. The boot program is stored on ROM and the boot file isnt? cheers, jazz

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• Attach Console to Service

  - by MemphiZ

  I currently have a WCF Service Library which will be started through a Console Application acting as ServiceHost. The ServiceHost starts the service and then waits with Console.ReadLine() for the "quit" command. If i do "Console.WriteLine();" in the service this will be printed to the ServiceHosts Console of course. The Service prints some information when the clients connect for example. Is it possible to have the ServiceHost converted to a real Windows Service (to start up when the machine boots without console window) and attach or detach a command prompt (cmd.exe) or another Console Application to it when needed? For example if I want so see which clients connect from now on? Thanks in advance!

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• Can't type after "ruby script/server" in InstantRails

  - by mathee

  I'm a newb to RoR. I'm using the book "Agile Web Development with Rails" to get started on Windows 7. In the command window, I run the following. >rails demo >cd demo >ruby script/server At this point, it boots the Mongrel server: => Booting Mongrel => Rails 2.3.5 application starting on http://0.0.0.0:3000 => Call with -d to detach => Ctrl-C to shutdown server The book goes on to tell me to run ruby script/generate controller Say but, I cannot Ctrl-C -- or type anything for that matter -- after booting the Mongrel server. Am I supposed to create the new controller in another instance of the InstantRails command window? Right now, the only way I can stop the server is closing the window in which I started the server! Please let me know if you need any other details. tia.

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• C++ : Lack of Standardization at the Binary Level

  - by Nawaz

  Why ISO/ANSI didn't standardize C++ at the binary level? There are many portability issues with C++, which is only because of lack of it's standardization at the binary level. Don Box writes, (quoting from his book Essential COM, chapter COM As A Better C++) C++ and Portability Once the decision is made to distribute a C++ class as a DLL, one is faced with one of the fundamental weaknesses of C++, that is, lack of standardization at the binary level. Although the ISO/ANSI C++ Draft Working Paper attempts to codify which programs will compile and what the semantic effects of running them will be, it makes no attempt to standardize the binary runtime model of C++. The first time this problem will become evident is when a client tries to link against the FastString DLL's import library from a C++ developement environment other than the one used to build the FastString DLL. Are there more benefits Or loss of this lack of binary standardization?

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• Error in releasing gem

  - by akhil

  Guys i am using jeweler to create a gem . I have successfully written my code and pushed it to github and my git status is clean . Now when i want to release my gem i did 'rake release' it is creating my gem .... but its is not releasing to rubyforge . and i end up in the following error Committing trisulrp.gemspec Pushing master to origin Tagging v1.2.2 Pushing v1.2.2 to origin Generated: trisulrp.gemspec trisulrp.gemspec is valid. WARNING: no rubyforge_project specified Successfully built RubyGem Name: trisulrp Version: 1.2.2 File: trisulrp-1.2.2.gem rake aborted! Permission denied - (./trisulrp-1.2.2.gem, ./pkg/trisulrp-1.2.2.gem) I don kno where am goin wrong .......

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• Distinguish UI change to variable from code-behind change

  - by Jay

  Like the title says I am trying to architecture into my application a way to distinguish the source of a variable change, either from UI or code-behind. My problem is that I need to trigger some action after a property changed its value, but I only need to do this when the change comes from the UI because otherwise I don-t want to perform that action. I am having some trouble because, for example when a checkbox(two way binding), changes state, my binded property gets updated and then I use the checked and uncheked events to trigger that action.The problem is that when I change the property in codebehind it also triggers those events and I do not want that. Right now, i am using a flag that enables, or not, the actions at the event handlers but I do not feel that this is a good idea. Any sugestions or ideas? I am considering using only one-way binding and control everything my self, using commands.

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• What makes you want to learn Common Lisp? What do you want from it?

  - by JasonFruit

  I'm working on a toolkit (sort of a live-CD Lisp-in-a-Box) for people new to Common Lisp, and I want to make sure it is broadly satisfying. What is attractive to you about Lisp? What do/did/would you need to get you started and keep you interested? What I have so far: SBCL 10.22, Emacs 22.3, SLIME, and LTK bundled together and configured on a Linux live-CD that boots entirely to RAM. I've now released the result of this; it is available at the Thnake website.

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• dynamic programming: speeding up this function

  - by aristotaly

  i have this program //h is our N static int g=0; int fun(int h){ if(h<=0){ g++; return g; } return g+fun(h-1)+fun(h-4); } is it possible to speed it up using dynamic programming i fugured out this function runs in O(2^n) it means that i suppose to reduce this time but the trouble is that i don get the idea of dinamic programming even a leading hint or a useful link to a resource will do it is a work assingment i do not ask for the solution :) just asking for the right direction

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• Preferred Method Of Application Purchase

  - by Chuck

  This is more of a "programmers" question, but felt that it was technical enough to belong on Stack Overflow instead. I'm launching an application soon that will follow the shareware model of purchase. I've thought about implementing this in a few ways: Limited access to the application until they purchase Full access to the application but expires after 30 day, requiring them to purchase to retain utility. Full access to the application indefinitely, but with a 10-15 second pop-up box on start-up asking them to register -- like mIRC does (or used to do). The method of authentication will be web-based. I'll provide them with an authentication key and they'll put it in the application. Whenever the application boots up, it'll check my web service and determine whether the application is genuine or not. This isn't my question. My question is: Is there a preferred method of implementation? I'd like to piss off the users as little as possible, but I'd also like to get paid for my work.

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• Extract some data from a lot of xml files

  - by LifeH2O

  I have cricket player profiles saved in the form of .xml files in a folder. each file has these tags in it <playerid>547</playerid> <majorteam>England</majorteam> <playername>Don</playername> the playerid is same as in .xml (each file is of different size,1kb to 5kb). These are about 500 files. What i need is to extract the playername, majorteam, and playerid from all these files to a list. I will convert that list to XML later. If you know how can i do it directly to XML i will be very thankful.

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• How to marshal structs with unknown length string fields in C#

  - by Ofir

  Hi all, I get an array of bytes, I need to unmarshal it to C# struct. I know the type of the struct, it has some strings fields. The strings in the byte array appears as so: two first bytes are the length of the string, then the string itself. I don;t know the length of the strings. I do know that its Unicode! [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)] public class User { int Id;//should be 1 String UserName;//should be OFIR String FullName;//should be OFIR } the byte array looks like so: 00,00,01,00, 00,00,08,00, 4F,00,46,00,49,00,52,00, 00,00,08,00, 4F,00,46,00,49,00,52,00, I also found this link with same problem unsolved: loading binary data into a structure Thank you all, Ofir

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• Communication between layers in an application

  - by Petar Minchev

  Hi guys! Let's assume we have the following method in the business layer. What's the best practice to tell the UI layer that something went wrong and give also the error message? Should the method return an empty String when it was OK, otherwise the error message, or should it throw another exception in the catch code wrapping the caught exception? If we choose the second variant then the UI should have another try,catch which is too much try,catch maybe. Here is a pseudocode for the first variant. public String updateSomething() { try { //Begin transaction here dataLayer.do1(); dataLayer.do2(); dataLayer.doN(); } catch(Exception exc) { //Rollback transaction code here return exc.message; } return ""; } Is this a good practice or should I throw another exception in the catch(then the method will be void)?

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• F# books question

  - by Michiel Borkent

  I am now reading Foundations of F# by Robert Pickering and parallelly the book in progress 'Real World Functional Programming' by Tomas Petricek. My question is, what is the added value I would get from buying and reading the following books: 1) Expert F# by Don Syme and others 2) F# for Scientists by John Harrop Are those books still up to date with the current CTP version. What are things to keep notice of with respect to the recent changes in the language? Will there be reprinted updated versions? Also I want to learn more about datamining techniques with F# as a tool for this. What are good books to read next on this topic?

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• PHP scandir strange behaviour

  - by kmunky

  ok, so what i'm trying to do is to scan the "previous" folder. $scanned = scandir(".."); foreach($scanned as $file){ if(is_file($file)){ print $file."<br />"; } } even though in my ".." directory i have 20+ files i get just three rows index.jpg index.php template.dtd i noticed that if i don;t use that is_file if clause it returns all file names; but i really need that if clause.

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• generate images with labels from a database

  - by Duncan Benoit

  hi there I need to have some images into my database, and the thing is that i need that images to have certain file names, dimensions and text on it. I know how to generate some images using the opencv lib, but this means that i need to install the lib and do just that job(which sounds as reinventing the wheel). Do you think is worth to do that or maybe you have a better idea? ps: the images are for testing stage of a software application, so i don;t need anything fancy or artistic.

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• Parameterise Service start option in WiX installer

  - by Jamiec

  I have a ServiceInstall component in a WiX installer where I have a requirement to either start auto or demand depending on parameters passed into the MSI. So the Xml element in question is <ServiceInstall Vital="yes" Name="My Windows Service" Type="ownProcess" Account="[SERVICEUSERDOMAIN]\[SERVICEUSERNAME]" DisplayName="My Service" Password="[SERVICEUSERPASSWORD]" Start="demand" Interactive="no" Description="Something interesting here" Id="Service" ErrorControl="ignore"></ServiceInstall> WiX will not allow using a PArameter for the Start attribute, so Im stuck with completely suplicating the component with a condition, eg/ <Component Id="ServiceDemand" Guid="{E204A71D-B0EB-4af0-96DB-9823605050C7}" > <Condition>SERVICESTART="demand"</Condition> ... and completely duplicating the whole component, with a different setting for Start and a different Condition. Anyone know of a more elegant solution? One where I don;t have to maintain 2 COmponents whjich do exactly the same thing except the Attribute for Start?

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• Trying to start a service on boot on Android

  - by Alex

  I've been trying to start a service when a device boots up on android, but I cannot get it to work. I've looked a number of links online but none of the code is working. Am I forgetting something? This is my code. Manifest <receiver android:name=".StartServiceAtBootReceiver" android:enabled="true" android:exported="false" android:label="StartServiceAtBootReceiver"> <intent-filter> <action android:name="android.intent.action._BOOT_COMPLETED"/> </intent-filter> </receiver> <service android:enabled="true" android:name="com.test.RunService"/> Receiver OnReceive public void onReceive(Context context, Intent intent) { if("android.intent.action.BOOT_COMPLETED".equals(intent.getAction())) { Intent serviceLauncher = new Intent(context, RunService.class); context.startService(serviceLauncher); Log.v("TEST", "Service loaded at start"); } } Thanks,

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• Oracle PL/SQL: Dump query result into file

  - by CC

  Hi. I'm working on a pl sql stored procedure. What I need is to do a select, use a cursor and for every record build a string using values. At the end I need to write this into a file. I try to use dbms_output.put_line("toto") but the buffer size is to small because I have about 14 millions lines. I call my procedure from a unix ksh. I'm thinking at something like using "spool on" (on the ksh side) to dump the result of my procedure, but I don' know how to do it (if this is possible) Anyone has any idea? Thank alot. C.C.

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• Is it possible to use AutoMapper to wrap methods?

  - by Woj

  I have two classes: public class TestClass1 { public int TestInt { get; set; } public void TestMethod() { // Do something } } public class TestClass2 { public int TestInt { get; set; } public void TestMethod() { // Do something } } I want to create interface that I can use for both classes. The easiest solution is to implement the interface on TestClass1 and TestClass2 but I don;t have access to the implementation of these classes (external dll). I was wondering if I can create new interface and use AutoMapper to map TestClass1 and TestClass2 to ITestInterface: public interface ITestInterface { int TestInt { get; set; } void TestMethod(); }

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• Can not search my company howto blog site anylonger... i can only search my mysites and users...

  - by Worldunix

  I have a Howto company Blog site that i post to for my clients to access for help. For some reason it has stopped letting anyone search on it. I can search for Mysites or users. But when you drop down the tab to search: This Site: "blog site name" you get the following reply: No results matching your search were found. Check your spelling. Are the words in your query spelled correctly? Try using synonyms. Maybe what you're looking for uses slightly different words. Make your search more general. Try more general terms in place of specific ones. Try your search in a different scope. Different scopes can have different results. I have tried the following command: from the Index server net stop osearch net start osearch iisreset /noforce But still not able to search a local blog site I can only search for users and Sites. please help Don

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• Starting socket server in ruby on rails on cloud environments (heroku)

  - by ElTren

  Hi, I'm using heroku, and I can push a Ruby on Rails app just fine, I'm trying to convert this to a Socket server, basically I would need to bind to an open port, in this case, I know Heroku only does 80 22 and 443. Is it possible to bind to port 80 on those environments? Also, how would I setup the entry point for this socket server, all I know is that when script/server it boots up the app. Do I have to put the function call there? How can a socket server start instead of the rails app on top of whatever webserver heroku has.

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• How do I know if a boost thread is done ?

  - by jules

  I am using boost::thread to process messages in a queue. When a first message comes I start a message processing thread. When a second message comes I check if the message processing thread is done. if it is done I start a new one if it is not done I don nothing. How do I know if the thread is done ? I tried with joinable() but it is not working, as when the thread is done, it is still joinable. I also tried to interrupt the process at once, and add an interruption point at the end of my thread, but it did not work. Thanks

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• Accessing children of loaded swf in Flex Image component

  - by pfunc

  I am loading an external swf into an component. It loads everything fine and I can see buttons working in the swf, but I can't seem to figure out how to add children to this swf from the core mxml file. I have tried tracing out all the children of the image component but can't find where or how to do this. This is the image component: <Image id="image" mask="{ maskCanvas }" source="{ _source }" mouseDown="image.startDrag()" visible="{ _source != null &amp;&amp; image.percentLoaded == 100 }" showEffect="{ fadeInEffect }" complete="imageComplete()" doubleClickEnabled="true" doubleClick="onDoubleClick()" /> And in my AS, I am trying to do something like this: myComponent.image.addChild("myMC"); But i either don;t see the clip or there I get an error about not being able to add the child to a ui component.

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