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  • C++ Array of pointers: delete or delete []?

    - by Jasper
    Cosider the following code: class Foo { Monster* monsters[6]; Foo() { for (int i = 0; i < 6; i++) { monsters[i] = new Monster(); } } virtual ~Foo(); } What is the correct destructor? this: Foo::~Foo() { delete [] monsters; } or this: Foo::~Foo() { for (int i = 0; i < 6; i++) { delete monsters[i]; } } I currently have the uppermost constructor and everything is working okey, but of course I cannot see if it happens to be leaking... Personally, I think the second version is much more logical considering what I am doing. Anyway, what is the "proper" way to do this?

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  • Eliminating false dependencies

    - by Klaus
    Hi all, I have a quite general question regarding false dependencies. As the name implies, those or no real dependencies and can be elimianated. I am aware of techniqes called register renaming that eliminate such dependencies at a hardware level. Of course I could eliminate those already at a "higher" level when writing assembler code that avoids false dependencies. But now I am wondering if also the compiler provides support to keep the number of false dependencies low or does it more rely on the hardware to eliminate those? Thanks

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  • How to create a changelog?

    - by Jasper Kennis
    I'm building a site that shows changes in deals that we have in our db. For example, if a deals status changes from pending to win, I want to show it, and if the value goes up or down, I want to show it, that kind of thing. Also, if you open the overview page, I want it to show the history of changes. So I need some kind of change logging, to be able to look in the past. How do I do this? It is a rails project, but I think that's irrelevant.

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  • dynamic inheritance without touching classes

    - by Jasper
    I feel like the answer to this question is really simple, but I really am having trouble finding it. So here goes: Suppose you have the following classes: class Base; class Child : public Base; class Displayer { public: Displayer(Base* element); Displayer(Child* element); } Additionally, I have a Base* object which might point to either an instance of the class Base or an instance of the class Child. Now I want to create a Displayer based on the element pointed to by object, however, I want to pick the right version of the constructor. As I currently have it, this would accomplish just that (I am being a bit fuzzy with my C++ here, but I think this the clearest way) object->createDisplayer(); virtual void Base::createDisplayer() { new Displayer(this); } virtual void Child::createDisplayer() { new Displayer(this); } This works, however, there is a problem with this: Base and Child are part of the application system, while Displayer is part of the GUI system. I want to build the GUI system independently of the Application system, so that it is easy to replace the GUI. This means that Base and Child should not know about Displayer. However, I do not know how I can achieve this without letting the Application classes know about the GUI. Am I missing something very obvious or am I trying something that is not possible?

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  • android resources in apk

    - by klaus-vlad
    HI Here's a thing I don't understand and hopefully someone will point to me. In my android development project under the folder res there are all the resources my application uses. The size is 3.11 mb and contains 1013 files . On the other hand in the apk there is the folder res with all the resources ass well , but this has a size of only 760 kb and contains only 332 files . Now does this means that not all the resources are packed ? If this is the case what happens when a needed resources is referenced ?

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  • calling a function from a set of overloads depending on the dynamic type of an object

    - by Jasper
    I feel like the answer to this question is really simple, but I really am having trouble finding it. So here goes: Suppose you have the following classes: class Base; class Child : public Base; class Displayer { public: Displayer(Base* element); Displayer(Child* element); } Additionally, I have a Base* object which might point to either an instance of the class Base or an instance of the class Child. Now I want to create a Displayer based on the element pointed to by object, however, I want to pick the right version of the constructor. As I currently have it, this would accomplish just that (I am being a bit fuzzy with my C++ here, but I think this the clearest way) object->createDisplayer(); virtual void Base::createDisplayer() { new Displayer(this); } virtual void Child::createDisplayer() { new Displayer(this); } This works, however, there is a problem with this: Base and Child are part of the application system, while Displayer is part of the GUI system. I want to build the GUI system independently of the Application system, so that it is easy to replace the GUI. This means that Base and Child should not know about Displayer. However, I do not know how I can achieve this without letting the Application classes know about the GUI. Am I missing something very obvious or am I trying something that is not possible?

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  • SQL query, select from 2 tables random

    - by klaus
    Hello all i have a problem that i just CANT get to work like i what it.. i want to show news and reviews (2 tables) and i want to have random output and not the same output here is my query i really hope some one can explain me what i do wrong SELECT anmeldelser.billed_sti , anmeldelser.overskrift , anmeldelser.indhold , anmeldelser.id , anmeldelser.godkendt FROM anmeldelser LIMIT 0,6 UNION ALL SELECT nyheder.id , nyheder.billed_sti , nyheder.overskrift , nyheder.indhold , nyheder.godkendt FROM nyheder ORDER BY rand() LIMIT 0,6

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  • application resources after update

    - by klaus-vlad
    Hi, I have a curiosity about application updates . What happens after such a process with the resources supposing that the update needs different resources than the ones the old version used ? Are they overwritten ?( like overwrite string.xml) or the old resources are deleted and replaced with the new ones ?

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  • UTC date and time

    - by klaus-vlad
    Hi, How can I obtain the current UTC time and date using a gps location changed lsitener ? public void onLocationChanged(Location lastLocation) { lastLocation.getTime() }

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  • C++ shared objects

    - by Klaus
    Hello, I have got four classes A, B, C and D. Class A has a member b of class B. Class B has a member c of class C. A has a member D* dpointer; This hierarchy has to be preserved (in fact this is a GUI with app, window, panel as A, B and C). Now B and C must use a method from *dpointer. Is there something more elegant than giving dpointer as a member of B and C ? Is it bad ?

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  • Set the volume of an android application

    - by klaus-johan
    Hi, In order for the user to control the volume , my android application has a menu consisting of a slider that provides int values from 0 to 10 , when dragged. After I obtain a value , I must set the volume to the corresponding value chosen by the user , and well , this is the part that I don't know to implement and I 'd like to find about it.

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  • Works on emulator but not on device

    - by Klaus
    Hello Community, I have an inner handler class that calls the method sendMessage. sendMessige is outside the handler class, but inside the conatining Android java class. On the emulator (AVD 2.2) it works fine, but on my Android 2.2 device the method sendMessage is not called at all. Inner handler class: private Handler handler2 = new Handler() { public void handleMessage(Message msg) { if (GeoSetting.equals("s") && (inNumber.equals(definedNumber))) **SendService.this.sendMessage(definedNumber, DisplayLoc)**; if (GeoSetting.equals("a")) **SendService.this.sendMessage(inNumber, DisplayLoc)**; stopService(new Intent(getApplicationContext(), GeoService.class)); }; The method that should be called: private void sendMessage(String sendNumber, String sendText){ Toast.makeText(getApplicationContext(), "done!!!", Toast.LENGTH_LONG).show(); SmsManager sms = SmsManager.getDefault(); try { sms.sendTextMessage(sendNumber, null, sendText, null, null); if (Message == true) {Toast.makeText(getApplicationContext(), "Sending SMS to "+sendNumber+": "+sendText, Toast.LENGTH_LONG).show();} } catch (Exception exeption){ Toast.makeText(getApplicationContext(), "Something is wrong, could not send SMS!", Toast.LENGTH_LONG).show(); } Toast.makeText(getApplicationContext(), "method called!", Toast.LENGTH_LONG).show(); } Does anybody have an idea why sendMessage is not called on the real device? Thank you for the help!

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  • PHP - How to retrieve session in php

    - by Klaus Jasper
    I created a table that contains id - names - jobs and page that shows the names only and beside each name there is button Job and session that contains the id. this is my code $query = mysql_query("SELECT * FROM table"); while($fetch = mysql_fetch_array("$query")){ $name = $fetch['names']; $id = $fetch['id']; echo '</br>'; echo $name; $_SESSION['name'] = $id; echo "<button>Job</button>"; } I want when the user click on button Job redirect to a page that contains the job of that session. so how can I do it?

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  • access resources of an apk

    - by klaus-vlad
    Hi I'm thinking at putting a .txt file in res/drawable or in res/layout to have it in the apk when the application is packed, and then after install to open and read from it to perform some tasks . Can this be done ? If yes please let me know how can I access the file ,as I don't know it's path .

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  • GAE JCache NumberFormatException, will I need to write Java to avoid?

    - by Jasper
    This code below produces a NumberFormatException in this line: val cache = cf.createCache(Collections.emptyMap()) Do you see any errors? Will I need to write a Java version to avoid this, or is there a Scala way? ... import java.util.Collections import net.sf.jsr107cache._ object QueryGenerator extends ServerResource { private val log = Logger.getLogger(classOf[QueryGenerator].getName) } class QueryGenerator extends ServerResource { def getCounter(cache:Cache):long = { if (cache.containsKey("counter")) { cache.get("counter").asInstanceOf[long] } else { 0l } } @Get("html") def getHtml(): Representation = { val cf = CacheManager.getInstance().getCacheFactory() val cache = cf.createCache(Collections.emptyMap()) val counter = getCounter(cache) cache.put("counter", counter + 1) val q = QueueFactory.getQueue("query-generator") q.add(TaskOptions.Builder.url("/tasks/query-generator").method(Method.GET).countdownMillis(1000L)) QueryGenerator.log.warning(counter.toString) new StringRepresentation("QueryGenerator started!", MediaType.TEXT_HTML) } } Thanks!

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  • C++ shared objets

    - by Klaus
    Hello, I have got four classes A, B, C and D. Class A has a member b of class B. Class B has a member c of class C. A has a member D* dpointer; This hierarchy has to be preserved (in fact this is a GUI with app, window, panel as A, B and C). Now B and C must use a method from *dpointer. Is there something more elegant than giving dpointer as a member of B and C ?

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  • Accessing methods of an object put inside a class

    - by Klaus
    Hello, A class A possesses an instance c of a class C. Another class B has to modify c through C::setBlah(); method. Is it bad to create an accessor C getC(); in A and then use A.getC().setBlah() ? Or should I create a method A::setBlah(); that would call C::setBlah(); ? Isn't it annoying if there are several methods like that ?

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  • $(selector).text() equivalent in c# (Revised)

    - by Ian Jasper Bardoquillo
    Hi, I am trying check if the inner html of the element is empty but I wanted to do the validation on the server side, I'm treating the html as a string. Here is my code public string HasContent(string htmlString){ // this is the expected value of the htmlString // <span class="spanArea"> // <STYLE>.ExternalClass234B6D3CB6ED46EEB13945B1427AA47{;}</STYLE> // </span> // From this jquery code--------------> // if($('.spanArea').text().length>0){ // // } // <------------------ // I wanted to convert the jquery statement above into c# code. /// c# code goes here return htmlSTring; } using this line $('.spanArea').text() // what is the equivalent of this line in c# I will know if the .spanArea does really have something to display in the ui or not. I wanted to do the checking on the server side. No need to worry about how to I managed to access the DOM I have already taken cared of it. Consider the htmlString as the Html string. My question is if there is any equivalent for this jquery line in C#? Thanks in advance! :)

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  • JavaOne Afterglow by Simon Ritter

    - by JuergenKress
    Last week was the eighteenth JavaOne conference and I thought it would be a good idea to write up my thoughts about how things went. Firstly thanks to Yoshio Terada for the photos, I didn't bother bringing a camera with me so it's good to have some pictures to add to the words. Things kicked off full-throttle on Sunday.  We had the Java Champions and JUG leaders breakfast, which was a great way to meet up with a lot of familiar faces and start talking all things Java.  At midday the show really started with the Strategy and Technical Keynotes.  This was always going to be tougher job than some years because there was no big shiny ball to reveal to the audience.  With the Java EE 7 spec being finalised a few months ago and Java SE 8, Java ME 8 and JDK8 not due until the start of next year there was not going to be any big announcement.  I thought both keynotes worked really well each focusing on the things most important to Java developers: Strategy One of the things that is becoming more and more prominent in many companies marketing is the Internet of Things (IoT).  We've moved from the conventional desktop/laptop environment to much more mobile connected computing with smart phones and tablets.  The next wave of the internet is not just billions of people connected, but 10s or 100s of billions of devices connected to the network, all generating data and providing much more precise control of almost any process you can imagine.  This ties into the ideas of Big Data and Cloud Computing, but implementation is certainly not without its challenges.  As Peter Utzschneider explained it's about three Vs: Volume, Velocity and Value.  All these devices will create huge volumes of data at very high speed; to avoid being overloaded these devices will need some sort of processing capabilities that can filter the useful data from the redundant.  The raw data then needs to be turned into useful information that has value.  To make this happen will require applications on devices, at gateways and on the back-end servers, all very tightly integrated.  This is where Java plays a pivotal role, write once, run everywhere becomes essential, having nine million developers fluent in the language makes it the defacto lingua franca of IoT.  There will be lots more information on how this will become a reality, so watch this space. Technical How do we make the IoT a reality, technically?  Using the game of chess Mark Reinhold, with the help of people like John Ceccarelli, Jasper Potts and Richard Bair, showed what you could do.  Using Java EE on the back end, Java SE and JavaFX on the desktop and Java ME Embedded and JavaFX on devices they showed a complete end-to-end demo. This was really impressive, using 3D features from JavaFX 8 (that's included with JDK8) to make a 3D animated Duke chess board.  Jasper also unveiled the "DukePad" a home made tablet using a Raspberry Pi, touch screen and accelerometer. Although the Raspberry Pi doesn't have earth shattering CPU performance (about the same level as a mid 1990s Pentium), it does have really quite good GPU performance so the GUI works really well.  The plans are all open sourced and available here.  One small, but very significant announcement was that Java SE will now be included with the NOOB and Raspbian Linux distros provided by the Raspberry Pi foundation (these can be found here).  No more hassle having to download and install the JDK after you've flashed your SD card OS image.  The finale was the Raspberry Pi powered chess playing robot.  Really very, very cool.  I talked to Jasper about this and he told me each of the chess pieces had been 3D printed and then he had to use acetone to give them a glossy finish (not sure what his wife thought of him spending hours in the kitchen in a gas mask!)  The way the robot arm worked was very impressive as it did not have any positioning data (like a potentiometer connected to each motor), but relied purely on carefully calibrated timings to get the arm to the right place.  Having done things like this myself in the past I know how easy it is to find a small error gets magnified into very big mistakes. Here's some pictures from the keynote: The "Dukepad" architecture Nice clear perspex case so you can see the innards. The very nice 3D chess set.  Maya's obviously a great tool. Read the full article here. WebLogic Partner Community For regular information become a member in the WebLogic Partner Community please visit: http://www.oracle.com/partners/goto/wls-emea ( OPN account required). If you need support with your account please contact the Oracle Partner Business Center. Blog Twitter LinkedIn Mix Forum Wiki Technorati Tags: Simon Ritter,Java One,OOW,Oracle OpenWorld,WebLogic,WebLogic Community,Oracle,OPN,Jürgen Kress

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  • Error running java -jar command

    - by dmantamp
    Hi all, I created a jar file using the following ANT script <manifestclasspath property="jar.classpath" jarfile="${bin.dir}/${jar.app.name}" maxparentlevels="0"> <classpath refid="main.class.path" /> </manifestclasspath> <target name="jar"> <mkdir dir="${build.dir}/lib/isp"/> <mkdir dir="${build.dir}/lib/jasper"/> <copy todir="${build.dir}/lib/jasper"> <fileset dir="${lib.jasper.dir}"> <include name="**/*.jar" /> </fileset> </copy> <copy todir="${build.dir}/lib/isp"> <fileset dir="${lib.isp.dir}"> <include name="**/*.jar" /> </fileset> </copy> <jar jarfile="${bin.dir}/${jar.app.name}" index="true" basedir="${classes.dir}" excludes="lib/mytest.jar " > <manifest> <attribute name="Main-Class" value="${main.class}" /> <attribute name="Class-Path" value="${jar.classpath}" /> </manifest> </jar> </target> The resulting jar file has the following MANIFEST.MF entry. Main-Class: dm.jb.Main Class-Path: lib/isp/OfficeLnFs_2.2.jar lib/isp/RXTXcomm.jar lib/isp/ba rbecue-1.0.6d.jar lib/isp/commons-logging-1.1.jar lib/isp/forms-1.0.5 .jar lib/isp/gnujaxp.jar lib/isp/helpUI.jar lib/isp/inspInstaller.jar lib/isp/itext-2.0.1.jar lib/isp/itext-2.0.2.jar lib/isp/jcalendar-1. 3.2.jar lib/isp/jcl.jar lib/isp/jcommon-1.0.10.jar lib/isp/jcommon-1. 0.9.jar lib/isp/jdnc-0_7-all.jar lib/isp/jdnc-runner.jar lib/isp/jdom .jar lib/isp/jfreechart-1.0.6.jar lib/isp/jlfgr-1_0.jar lib/isp/junit .jar lib/isp/log4j-1.2.9.jar lib/isp/looks-1.3.2.jar lib/isp/msbase.j ar lib/isp/mssqlserver.jar lib/isp/msutil.jar lib/isp/mysql-connector When I try to run the command java -jar mytest.jar, it fails and throws error saying dm.jb.Main not found. But I could run the class by specifying the classpath java -classpath dm.jb.Main Please help me DM

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  • Where is the displaytag of scheduled reporting?

    - by Nathan Feger
    So I have been making some reports and using displaytag to output these reports in html, csv, excel, pdf, etc. They are paginated, and take a simple object graph... and output excellent results everytime, with very little code. However, I need to use displaytag or its equivalent outside of a jsp. So that a user can schedule a report to run, and that report is stored in a db, or emailed for later viewing. I have looked at jasper-based reporting solutions, but making a jasper jrxml file is just a nightmare. I know there are gui tools to help, but I'm content with the simple output of displaytable, so I'm happy to give up that control for ease of implementation. Really, if I could take the display:table config out of the jsp I would, so please keep that in mind when proposing a solution. btw, java solutions would be my cup of tea.

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  • How to configure iReports to use grails domain class ?

    - by fabien-barbier
    I'm using JasperGrails plugins (http://www.grails.org/Jasper+Plugin) to generate reports. When I configure iReports dataSource with Database JDBC connection everything works well. But how to configure iReports with grails and Jasper plugin ? I try to configure my dataSource by selecting "JavaBeans set data source", but I have this error message : ClassNotFoundError ! (I try to add my domain in classpath by pointing to my IDEA project folder, but I have always same message). What is the best way to configure iReports with grails/groovy ?

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