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  • Behavior of virtual function in C++

    - by Summer_More_More_Tea
    Hi everyone: I have a question, here are two class below: class Base{ public: virtual void toString(); // generic implementation } class Derive : public Base{ public: ( virtual ) void toString(); // specific implementation } The question is: If I wanna subclass of class Derive perform polymophism using a pointer of type Base, is keyword virtual in the bracket necessary? If the answer is no, what's the difference between member function toString of class Derive with and without virtual?

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  • Real-time equalizer for all audio on computer

    - by greye
    Is it possible to capture all the sound from a computer and have it pass through a equalizer before reaching the speakers? How can you program a band pass filter on it? EDIT: I'm trying to get this on Windows (with Python? heh) but if there is a generic, cross-platform approach that would be great.

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  • Quering computed fields in GORM

    - by Tihom
    I am trying to query the following HQL using GORM: MailMessage.executeQuery("toId, count(toId) from (SELECT toId, threadId FROM MailMessage as m WHERE receiveStatus = '$u' GROUP BY threadId, toId) as x group by x.toId") The problem is that count(toId) is a computed field doesn't exist in MailMessage and that I am using a subquery. I get the following error: java.lang.IllegalArgumentException: node to traverse cannot be null! Ideally, I would like to use a generic executeQuery which will return data of anytype. Is there such a thing?

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  • php OOP, full sample

    - by lolalola
    Hi, On this site I found a lot of cool examples of PHP OOP. Maybe you know where to find complete examples? Guest books, registration forms, blog... When I look at the full model is much easier to understand OOP PHP. As different classes interacting with each other, exchange data How to use the generic class for sending data to the database Thanks

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  • Neat way of calling InvokeRequired and Invoke

    - by ho
    I seem to remember seeing some neat way of calling InvokeRequired and Invoke to avoid repeating too much code in every event handler but I can't remember what that was. So does anyone know a neat way of writing that code? Preferably for VB.Net 2005.

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  • Generics and anonymous type

    - by nettguy
    I understood,normally generics is for compile time safe and allow us to keep strongly typed collection.Then how do generic allow us to store anonymous types like List<object> TestList = new List<object>(); TestList.Add(new { id = 7, Name = "JonSkeet" }); TestList.Add(new { id = 11, Name = "Marc Gravell" }); TestList.Add(new { id = 31, Name = "Jason" });

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  • Ember-App-Kit: How to execute code only in release mode?

    - by Dominik Schmidt
    I have created an error handler as described here: http://emberjs.com/guides/understanding-ember/debugging/#toc_implement-a-code-ember-onerror-code-hook-to-log-all-errors-in-production But this code is not only executed in production mode but also in normal debug builds which floods my server logs. I know that Ember.debug() calls and alike are being filtered out for production builds, but I couldn't find out where/how that is implemented and if that same mechanism could be used to make my code only fire in production code.

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  • GWT.setUncaughtExceptionHandler()

    - by moorsu
    Has anyone successfully use the above statement to catch the exception before it goes to the browser as an alert?. I did set an exception handler in the first line of my entry point. But it does not catch the exception as expected. public void onModuleLoad(){ GWT.setUncaughtExceptionHandler(new MyExceptionHandler()); ... .... }

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  • MSI Parameter Inspection

    - by Ben Breen
    With a windows MSI file, is there a way to grab all the possible installation parameters in .NET code? I need to make a generic user interface to configure multiple MSI files not known until run-time – then install them together in one go.

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  • installing a package with xml based configuration in python

    - by saminny
    Hi, I am planning to write a generic python module for installing a package. This script should retrieve the module from a remote machine or locally and install it on a given host and user. However, there needs to be changes made to the package files based on the host, user and given environment. My approach is to use XML to describe changes to be made to package files based on environment. It will first extract the package to the user directory and then using an xml configuration file, it should replace the file values in the package directory. The xml would look something like this: <package version="1.3.3"> <environment type="prod"> <file dir="d1/d2" name="f1"> <var id="RECV_HOST" value="santo"> <var id="RECV_PORT" value="RECV_PORT_SERVICE" type="service"> <var id="JEPL_SERVICE_NAME" value="val_omgact"> </file> <var dir="d4/d3/s2" name="f2"> <var id="PRECISION" value="true"> <var id="SEND_STATUS_CODE" value="323"> <var id="JEPL_SERVICE_NAME" value="val_omgact"> </file> </environment> <environment type="qa"> <file dir="d1/d2" name="f1"> <var id="RECV_HOST" value="test"> <var id="RECV_PORT" value="1444"> <var id="JEPL_SERVICE_NAME" value="val_tsdd"> </file> <file dir="d4/d3/s2" name="f2"> <var id="PRECISION" value="false"> <var id="SEND_STATUS_CODE" value="323"> <var id="JEPL_SERVICE_NAME" value="val_dsd"> </file> </environment> </package> What are your thoughts on this approach? Is there an existing python module, package or script that I could use for this purpose since this seems fairly generic and can be used for any installation. Thanks! Sam

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  • extract all urls from a string

    - by codemonkey12
    I have a string of text that contains html, and I need to extract each url (most likely in img or a tags) to create a generic list of string objects. Is there an easy way to do this or will I have to resort to regular expressions? If I have to resort to regular expressions, would you mind helping me out with that as well? :)

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  • Display image at point using jQuery

    - by Chris
    I have an image with a click event handler that captures the location where you clicked. $("#image").click(function(e) { var x = e.pageX - $(this).offset().left; var y = e.pageY - $(this).offset().top; }); I want it so that when the image is clicked an image appears at that location on top of the image. How do I do this?

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  • Force deletion of slot in boost::signals2

    - by villintehaspam
    Hi! I have found that boost::signals2 uses sort of a lazy deletion of connected slots, which makes it difficult to use connections as something that manages lifetimes of objects. I am looking for a way to force slots to be deleted directly when disconnected. Any ideas on how to work around the problem by designing my code differently are also appreciated! This is my scenario: I have a Command class responsible for doing something that takes time asynchronously, looking something like this (simplified): class ActualWorker { public: boost::signals2<void ()> OnWorkComplete; }; class Command : boost::enable_shared_from_this<Command> { public: ... void Execute() { m_WorkerConnection = m_MyWorker.OnWorkDone.connect(boost::bind(&Command::Handle_OnWorkComplete, shared_from_this()); // launch asynchronous work here and return } boost::signals2<void ()> OnComplete; private: void Handle_OnWorkComplete() { // get a shared_ptr to ourselves to make sure that we live through // this function but don't keep ourselves alive if an exception occurs. shared_ptr<Command> me = shared_from_this(); // Disconnect from the signal, ideally deleting the slot object m_WorkerConnection.disconnect(); OnComplete(); // the shared_ptr now goes out of scope, ideally deleting this } ActualWorker m_MyWorker; boost::signals2::connection m_WorkerConnection; }; The class is invoked about like this: ... boost::shared_ptr<Command> cmd(new Command); cmd->OnComplete.connect( foo ); cmd->Execute(); // now go do something else, forget all about the cmd variable etcetera. the Command class keeps itself alive by getting a shared_ptr to itself which is bound to the ActualWorker signal using boost::bind. When the worker completes, the handler in Command is invoked. Now, since I would like the Command object to be destroyed, I disconnect from the signal as can be seen in the code above. The problem is that the actual slot object is not deleted when disconnected, it is only marked as invalid and then deleted at a later time. This in turn appears to depend on the signal to fire again, which it doesn't do in my case, leading to the slot never expiring. The boost::bind object thus never goes out of scope, holding a shared_ptr to my object that will never get deleted. I can work around this by binding using the this pointer instead of a shared_ptr and then keeping my object alive using a member shared_ptr which I then release in the handler function, but it kind of makes the design feel a bit overcomplicated. Is there a way to force signals2 to delete the slot when disconnecting? Or is there something else I could do to simplify the design? Any comments are appreciated!

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  • Detemining a database's OS with a SQL query?

    - by KaizenSoze
    I'm writing a tool to gather customer configuration information. One of the questions I want to answer, what OS is the customer database running on. I haven't found a generic way to find the OS with SQL and I can't create stored procedures on the customer's database. If there is a way, it's probably vendor specific. Suggestions? Thanks in advance.

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  • Unlock device, display a text, then lock again

    - by Waza_Be
    For the need of my application, I need to display a message on the screen even if the lockscreen is enabled, then wait 3 seconds, than I have to lock again the phone as I don't want it to make unwanted phone calls in your pockets. First part is easy: if (PreferenceManager.getDefaultSharedPreferences( getBaseContext()).getBoolean("wake", false)) { KeyguardManager kgm = (KeyguardManager) getSystemService(Context.KEYGUARD_SERVICE); boolean isKeyguardUp = kgm.inKeyguardRestrictedInputMode(); WakeLocker.acquire(ProtoBenService.this); Intent myIntent = new Intent(ProtoBenService.this,LockActivity.class); myIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); if (isKeyguardUp) { ProtoBenService.this.startActivity(myIntent); } else Toast.makeText(ProtoBenService.this.getBaseContext(), intention, Toast.LENGTH_LONG).show(); WakeLocker.release(); } With this class: public abstract class WakeLocker { private static PowerManager.WakeLock wakeLock; public static void acquire(Context ctx) { if (wakeLock != null) wakeLock.release(); PowerManager pm = (PowerManager) ctx.getSystemService(Context.POWER_SERVICE); wakeLock = pm.newWakeLock(PowerManager.FULL_WAKE_LOCK | PowerManager.ACQUIRE_CAUSES_WAKEUP | PowerManager.ON_AFTER_RELEASE, "CobeIm"); wakeLock.acquire(); } public static void release() { if (wakeLock != null) wakeLock.release(); wakeLock = null; } } And the Activity: public class LockActivity extends Activity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); Window window = getWindow(); window.addFlags(WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD); window.addFlags(WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON); window.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON); TextView tv = new TextView(this); tv.setText("This is working!"); tv.setTextSize(45); setContentView(tv); Runnable mRunnable; Handler mHandler = new Handler(); mRunnable = new Runnable() { @Override public void run() { LockActivity.this.finish(); } }; mHandler.postDelayed(mRunnable, 3 * 1000); } } So, this is nice, the phone can display my text! The only problem comes when I want to lock again the phone, it seems that locking the phone is protected by the system... Programmatically turning off the screen and locking the phone how to lock the android programatically I think that my users won't understand the Device Admin and won't be able to activate it. Is there any workaround to lock the screen without the Device Admin stuff?

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  • Is it abuse to put application/business logic inside of jQuery plugins?

    - by RenderIn
    Is it appropriate to create jQuery plugins which are specific to a single page? I've been creating generic plugins that are not tied to any context and contain no business logic, but some people I've talked to suggest that almost all javascript, including business logic and logic specific to a single page, should be inside of jQuery plugins. Is it appropriate to have a validateformXYZ plugin which validates a specific HTML form? I'm buying into jQuery 100% but am not sure if this is a misuse or not.

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  • Javascript Iterator Class

    - by Alsciende
    Do you know a js library that implements a generic Iterator class for collections (be it Arrays or some abstract Enumerable) with a full set of features, like the Google Common or the Apache Commons?

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  • rewrite all requests from one folder to a parent folder htaccess

    - by Neo
    This one has me stumped, I need to re-write all requests to the javascript folder (js) to a special library handler system. e.g. rewrite http://localhost/admin/js/bar.js --> http://localhost/_lib/=admin/js/bar.js Any ideas? I have tried the following which creates an error RewriteCond %{REQUEST_URI} ^(.*)$ RewriteRule ^(.*)$ /%1/_lib/$1 [NC] (36)File name to long: cannot map GET /admin/js/bar.js to file

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  • How to access the map returned by IParameterValues::getParameterValues()?

    - by Hua
    I declared a command and a commandParameter for this command. I specified the "values" of this commandParameter as a class implemented by myself. The implementation of this class is below, public class ParameterValues implements IParameterValues { @Override public Map<String, Double> getParameterValues() { // TODO Auto-generated method stub Map<String, Double> values = new HashMap<String, Double>(2); values.put("testParam", 1.1239); values.put("AnotherTest", 4.1239); return values; } } The implementation of the handler of this command is blow, public class testHandler extends AbstractHandler implements IHandler { private static String PARAMETER_ID = "my.parameter1"; @Override public Object execute(ExecutionEvent event) throws ExecutionException { String value = event.getParameter(PARAMETER_ID); MessageDialog.openInformation(HandlerUtil.getActiveShell(event), "Test", "Parameter ID: " + PARAMETER_ID + "\nValue: " + value); return null; } } Now, I contribute the command to a menu, <menuContribution locationURI="menu:org.eclipse.ui.main.menu"> <menu id="my.edit" label="Edit"> <command commandId="myCommand.test" label="Test1"> <parameter name="my.parameter1" value="testParam"> </parameter> </command> Since I specified a "values" class for the commandParater, I expect when the menu is clicked, this code line "String value = event.getParameter(PARAMETER_ID);" in the handler class returns 1.1239 instead of "testParam". But, I still see that code line returns "testParam". What's the problem? How could I access the map returned by getParameterValues()? By the way, following menu declaration still works even I don't define "ppp" in the map. <menuContribution locationURI="menu:org.eclipse.ui.main.menu"> <menu id="my.edit" label="Edit"> <command commandId="myCommand.test" label="Test1"> <parameter name="my.parameter1" value="ppp"> </parameter> </command> Thanks!

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  • Getting the URL of a model in Lift

    - by scompt.com
    I'm coming at Lift from a Django point of view, so in Django parlence, I'm trying to find the Lift equivalent of reverse. In generic terms, I have an instance of a model and I would like to get the URL that that model can be accessed at according to the SiteMap. I've tried extending Loc, but that doesn't seem to have brought me further towards my goal. I'm using the most recent 1.1 milestone (M8?).

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