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  • Java: why is declaration not sufficient in interface?

    - by HH
    Big class contains Format-interfcase and Format-class. The Format-class contains the methods and the interface has the values of the fields. I could have the fields in the class Format but the goal is with Interface. So do I just create dummy-vars to get the errors away, design issue or something ELSE? KEY: Declaration VS Initialisation Explain by the terms, why you have to init in interface. What is the logic behind it? To which kind of problems it leads the use of interface? Sample Code having the init-interface-problem import java.util.*; import java.io.*; public class FormatBig { private static class Format implements Format { private static long getSize(File f){return f.length();} private static long getTime(File f){return f.lastModified();} private static boolean isFile(File f){if(f.isFile()){return true;}} private static boolean isBinary(File f){return Match.isBinary(f);} private static char getType(File f){return Match.getTypes(f);} private static String getPath(File f){return getNoErrPath(f);} //Java API: isHidden, --- SYSTEM DEPENDED: toURI, toURL Format(File f) { // PUZZLE 0: would Stack<Object> be easier? size=getSize(f); time=getTime(f); isfile=isFile(f); isBinary=isBinary(f); type=getType(f); path=getPath(f); //PUZZLE 1: how can simplify the assignment? values.push(size); values.push(time); values.push(isfile); values.push(isBinary); values.push(type); values.push(path); } } public static String getNoErrPath(File f) { try{return f.getCanonicalPath(); }catch(Exception e){e.printStackTrace();} } public static final interface Format { //ERR: IT REQUIRES "=" public long size; public long time; public boolean isFile=true; //ERROR goes away if I initialise wit DUMMY public boolean isBinary; public char type; public String path; Stack<Object> values=new Stack<Object>(); } public static void main(String[] args) { Format fm=new Format(new File(".")); for(Object o:values){System.out.println(o);} } }

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  • Batch File - REN command's ErrorLevel returns 0 even on failure

    - by FMFF
    This is related to my earlier question. ren "C:\Temp\%%A" "C:\Temp\%%A" if errorlevel 0 ( "C:\Program Files\7-Zip\cmdline\7za.exe" a -tzip -mx9 "C:\temp\Zip\%%A.zip" "C:\temp\%%A" Move "C:\temp\%%A" "C:\Temp\Archive" ) In the above, the IF evaluates to true always, even if REN command fails. The idea is to check if a file is not locked by any other application, if not then Archive it and move it elsewhere. How best to do this? Thank you.

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  • Panning weirdness on an UserControl

    - by Matías
    Hello, I'm trying to build my own "PictureBox like" control adding some functionalities. For example, I want to be able to pan over a big image by simply clicking and dragging with the mouse. The problem seems to be on my OnMouseMove method. If I use the following code I get the drag speed and precision I want, but of course, when I release the mouse button and try to drag again the image is restored to its original position. using System.Drawing; using System.Windows.Forms; namespace Testing { public partial class ScrollablePictureBox : UserControl { private Image image; private bool centerImage; public Image Image { get { return image; } set { image = value; Invalidate(); } } public bool CenterImage { get { return centerImage; } set { centerImage = value; Invalidate(); } } public ScrollablePictureBox() { InitializeComponent(); SetStyle(ControlStyles.AllPaintingInWmPaint | ControlStyles.OptimizedDoubleBuffer, true); Image = null; AutoScroll = true; AutoScrollMinSize = new Size(0, 0); } private Point clickPosition; private Point scrollPosition; protected override void OnMouseDown(MouseEventArgs e) { base.OnMouseDown(e); clickPosition.X = e.X; clickPosition.Y = e.Y; } protected override void OnMouseMove(MouseEventArgs e) { base.OnMouseMove(e); if (e.Button == MouseButtons.Left) { scrollPosition.X = clickPosition.X - e.X; scrollPosition.Y = clickPosition.Y - e.Y; AutoScrollPosition = scrollPosition; } } protected override void OnPaint(PaintEventArgs e) { base.OnPaint(e); e.Graphics.FillRectangle(new Pen(BackColor).Brush, 0, 0, e.ClipRectangle.Width, e.ClipRectangle.Height); if (Image == null) return; int centeredX = AutoScrollPosition.X; int centeredY = AutoScrollPosition.Y; if (CenterImage) { //Something not relevant } AutoScrollMinSize = new Size(Image.Width, Image.Height); e.Graphics.DrawImage(Image, new RectangleF(centeredX, centeredY, Image.Width, Image.Height)); } } } But if I modify my OnMouseMove method to look like this: protected override void OnMouseMove(MouseEventArgs e) { base.OnMouseMove(e); if (e.Button == MouseButtons.Left) { scrollPosition.X += clickPosition.X - e.X; scrollPosition.Y += clickPosition.Y - e.Y; AutoScrollPosition = scrollPosition; } } ... you will see that the dragging is not smooth as before, and sometimes behaves weird (like with lag or something). What am I doing wrong? I've also tried removing all "base" calls on a desperate movement to solve this issue, haha, but again, it didn't work. Thanks for your time.

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  • GetHashCode on null fields?

    - by Shimmy
    How do I deal with null fields in GetHashCode function? Module Module1 Sub Main() Dim c As New Contact Dim hash = c.GetHashCode End Sub Public Class Contact : Implements IEquatable(Of Contact) Public Name As String Public Address As String Public Overloads Function Equals(ByVal other As Contact) As Boolean _ Implements System.IEquatable(Of Contact).Equals Return Name = other.Name AndAlso Address = other.Address End Function Public Overrides Function Equals(ByVal obj As Object) As Boolean If ReferenceEquals(Me, obj) Then Return True If TypeOf obj Is Contact Then Return Equals(DirectCast(obj, Contact)) Else Return False End If End Function Public Overrides Function GetHashCode() As Integer Return Name.GetHashCode Xor Address.GetHashCode End Function End Class End Module

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  • setting a value through jquery

    - by Hulk
    <script> function edit(elem) { var ele=$(elem).siblings('label#test').html(); var a=document.getElementById('test'); var htm = '<input type="text" name="modal" id="modal" style="width:70%;" value="'+$(elem).siblings('label#test').html();+'"/>'; $dialog.html(htm) .dialog({ autoOpen: true, position: 'center' , title: 'EDIT', draggable: false, width : 300, height : 40, resizable : false, modal : true, buttons: { "Save" : function() { if($('#modal').val() != ''){a.value=$('#modal').val();$dialog.dialog('close');} else {alert('i++'+$('#modal').val()+'++');} } } }); $dialog.dialog('open'); } $(document).ready(function() { var flag=0; $("input:radio[@name=template]").click(function() { var checkedoption = $(this).val(); if (checkedoption == "template3") { if (flag == 0) { var html = '<input type="text" name="val" id="val" />&nbsp;&nbsp;&nbsp;<input type="button" value="Add" id="add"><br>'; $('#useroptions').append(html); flag=1; $('#add').click(function(){ var a = $('#val').val(); if (a == '') { alert('Enter options'); } else { var section= '<tr class="clickable"><td id="userval" BGCOLOR="#FF6699"><label id="test">' + a + '</label>&nbsp;&nbsp;&nbsp; <IMG SRC="/media/img/chunkedit.gif" onclick="javascript:edit(this);" >&nbsp;&nbsp;&nbsp;<IMG SRC="/media/img/close.gif" onclick="javascript:remove(this);" ></td></tr>'; $('#useroptions').append(section); } }); } } }); }); </script> <form> <table> <tr><td> <div id="useroptions"></div> </tr></td> </table> </form> How to set a new value for test in the above code.. Thanks

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  • Sqlite / SQLAlchemy: how to enforce Foreign Keys?

    - by Nick Perkins
    The new version of SQLite has the ability to enforce Foreign Key constraints, but for the sake of backwards-compatibility, you have to turn it on for each database connection separately! sqlite> PRAGMA foreign_keys = ON; I am using SQLAlchemy -- how can I make sure this always gets turned on? What I have tried is this: engine = sqlalchemy.create_engine('sqlite:///:memory:', echo=True) engine.execute('pragma foreign_keys=on') ...but it is not working!...What am I missing?

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  • AS3 Regular Expression Question...

    - by Coltech
    Can someone give me a regular expression that will verify if all the letters in the word "cat" were also in the word "coating" in the proper sequence? So for the word "coating", the RegEx will test true for "cat" but false for "act".

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  • How to make custom join query with Django ?

    - by xRobot
    I have these 2 models: genre = ( ('D', 'Dramatic'), ('T', 'Thriller'), ('L', 'Love'), ) class Book(models.Model): title = models.CharField(max_length=100) genre = models.CharField(max_length=1, choices=genre) class Author(models.Model): user = models.ForeignKey(User, unique=True) born = models.DateTimeField('born') book = models.ForeignKey(Book) I need to retrieve first_name and last_name of all authors of dramatic's books. How can I do this in django ?

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  • EventDispatcher between an as and an fla?

    - by Christopher Richa
    Hi everyone. I am making a fighting game in Flash and while I have everything running, I am missing something: a victory/loss screen. Logically, I know how to do it: if character.hp < 0 { character.dead = true; dispatchevent("death", event) } My problem is that I have no idea as to how to code it. I know I will use two classes and my two .fla files (unless I am wrong). I have two .fla files that are in play here: the Menu.fla file and the Arena.fla file. Menu.fla contains the entire navigation of the game, options, character selection screens, etc. and when it is time for the player to engage in battle, it loads the Arena.fla file, which contains only the backgrounds (depending on the selected stage) and for now is set to a length of one frame only. For Arena.fla, the real action happens in my classes, but logically, I would only need HP.as and Character.as. In Character.as, I have declared the following variable: var isDead:Boolean = false; //is character dead? In HP.as, believe I should have the following: if(currentHp<0) { currentHp = 0; character.isDead = true; //declared as var `character:Object;` EventDispatcher.dispatchEventListener("playerDead", playerDead); } And finally, in Arena.fla, I want to be able to detect the above-mentioned eventlistener and simply move on to a second frame which will display a message in the style of "PLAYER ONE HAS WON" or "PLAYER ONE HAS LOST" with a button that will allow me to go back to the character selection screen. This is the first part in which I am stuck: how do I detect the dispatched event listener in my main .fla file? Secondly, if the player clicks on the "CONTINUE" button, which displays regardless if the player has won or lost, how can my Menu.fla (which loads the Arena.swf) detect this click event, unload the game, and go back to the character selection screen? Thank you in advance for helping me out. I realize this is a lot of text but it's the most descriptive I can be. If you have any questions or need any clarification concerning my question, feel free to speak up. -Christopher

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  • Optimize mysql table ?

    - by fabien-barbier
    Here is my actual table schema (I'm using Mysql) : Table experiment : code(int) sample_1_id sample_2_id ... until ... sample_12_id rna_1_id rna_2_id ... until ... rna_12_id experiment_start How can I optimize both part : sample_n_id and rna_n_id (all are bigint(20) and allow null=true) ? About values : we can have : ex : sample_1_id = 2 , Sample_2_id = 5 , ... Note : values can be updated. Ideas ? Thanks.

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  • ssL HTTPS for windows mobile 6::unable to read transport connection

    - by Santhosh
    Hi am trying Https ssl connection in my C# application...i am getting "Unable to read transport connection" for the line WebResponse response = (HttpWebResponse)request.GetResponse(); I am forcing Certificate to be accepted ServicePointManager.CertificatePolicy = new MyPolicy(); public class MyPolicy : ICertificatePolicy { public bool CheckValidationResult(ServicePoint sp, X509Certificate cert, WebRequest req, int problem) { return true; } } Working fine in WM5 may i plz know the wat is goin wrong?plz thanks in advance

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  • Multiple Headers in asp.net

    - by digiguru
    I'm running code that seems to hit the "AppendHeader" twice in the code. Response.Filter = New DeflateStream(Response.Filter, CompressionMode.Compress, True) Response.AppendHeader("Content-encoding", "deflate") ... Response.AppendHeader("Content-encoding", "deflate") I have tried using the following.... Response.Headers("Content-encoding") = "deflate" But it says This operation requires IIS integrated pipeline mode. How do I check for a headers existence, and overwrite it rather than appending it.

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  • Spring JPA and persistence.xml

    - by bmw0128
    I'm trying to set up a Spring JPA Hibernate simple example WAR for deployment to Glassfish. I see some examples use a persistence.xml file, and other examples do not. Some examples use a dataSource, and some do not. So far my understanding is that a dataSource is not needed if I have: <persistence-unit name="educationPU" transaction-type="JTA"> <provider>org.hibernate.ejb.HibernatePersistence</provider> <class>com.coe.jpa.StudentProfile</class> <properties> <property name="hibernate.connection.driver_class" value="com.mysql.jdbc.Driver" /> <property name="hibernate.connection.url" value="jdbc:mysql://localhost:3306/COE" /> <property name="hibernate.connection.username" value="root" /> <property name="show_sql" value="true" /> <property name="dialect" value="org.hibernate.dialect.MySQLDialect" /> </properties> </persistence-unit> I can deploy fine, but my EntityManager is not getting injected by Spring. My applicationContext.xml: <bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalEntityManagerFactoryBean"> <property name="persistenceUnitName" value="educationPU" /> </bean> <bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager"> <property name="entityManagerFactory" ref="entityManagerFactory" /> </bean> <bean class="org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor" /> <tx:annotation-driven transaction-manager="transactionManager" /> <bean id="StudentProfileDAO" class="com.coe.jpa.StudentProfileDAO"> <property name="entityManagerFactory" ref="entityManagerFactory" /> </bean> <bean id="studentService" class="com.coe.services.StudentService"> </bean> My class with the EntityManager: public class StudentService { private String saveMessage; private String showModal; private String modalHeader; private StudentProfile studentProfile; private String lastName; private String firstName; @PersistenceContext(unitName="educationPU") private EntityManager em; @Transactional public String save() { System.out.println("*** em: " + this.em); //em is null this.studentProfile= new StudentProfile(); this.saveMessage = "saved"; this.showModal = "true"; this.modalHeader= "Information Saved"; return "successs"; } My web.xml: <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> Are there any pieces I am missing to have Spring inject "em" in to StudentService?

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  • Flex Sprite ButtonMode

    - by dta
    I have a sprite on which I have added two textfields side by side, horizontally. I have set the buttonmode of sprite = true. But the mouse cursor changes from regular to clickable only when I hover it on the textfields. In the empty area between the two textfields, the cursor still appears regular/normal. Why could it be?

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  • Qt4: QPrinter / QPainter only prints the first document

    - by hurikhan77
    The problem is that my application only prints the first document fine. The second document is empty, only the page number is printed, the rest of the page is empty. In Qt4, I'm initializing the printer in the main.cpp in the following way: mw->printer = new QPrinter(QPrinter::HighResolution); mw->printer->setPaperSize(QPrinter::A5); mw->printer->setNumCopies(2); mw->printer->setColorMode(QPrinter::GrayScale); QPrintDialog *dialog = new QPrintDialog(mw->printer, mw); dialog->setWindowTitle(QObject::tr("Printer Setup")); if (dialog->exec() == QDialog::Accepted) { mw->printer->setFullPage(TRUE); return a.exec (); } This works fine for printing the first document from the application: qDebug("Printing"); QPainter p; if (!p.begin(printer)) { qDebug("Printing aborted"); return; } Q3PaintDeviceMetrics metrics(p.device()); int dpiy = metrics.logicalDpiY(); int dpix = metrics.logicalDpiX(); int tmargin = (int) ((marginTop / 2.54) * dpiy); int bmargin = (int) ((marginBottom / 2.54) * dpiy); int lmargin = (int) ((marginLeft / 2.54) * dpix); int rmargin = (int) ((marginRight / 2.54) * dpix); QRect body(lmargin, tmargin, metrics.width() - (lmargin + rmargin), metrics.height() - (tmargin + bmargin)); QString document; /* ... app logic to write a richtext document */ Q3SimpleRichText richText(QString("<qt>%1</qt>").arg(document), QFont("Arial", fontSize)); richText.setWidth(&p, body.width()); QRect view(body); int page = 1; do { // draw text richText.draw(&p, body.left(), body.top(), view, colorGroup()); view.moveBy(0, body.height()); p.translate(0, -body.height()); // insert page number p.drawText(view.right() - p.fontMetrics().width(QString::number(page)), view.bottom() + p.fontMetrics().ascent() + 5, QString::number(page)); // exit loop on last page if (view.top () >= richText.height ()) break; printer->newPage(); page++; } while (TRUE); if (!p.end()) qDebug("Print painter yielded failure"); But when this routine runs the second time, it does not print the document. It will just print an empty page but still with the page number on it. This worked fine before with Qt3.

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  • django: Display image in admin interface

    - by Oleg Tarasenko
    Hi, I've defined a model which contains a link an image. Is there a way to display the image in the model items list. (e.g. if I defined an article this way: class Article(models.Model): url = models.CharField(max_length = 200, unique = True, help_text="/lessons/") title = models.CharField(max_length = 500) img = models.CharField(max_length = 100) # Contains path to image def __unicode__(self): return u"%s" %title ) Is there a way to display image together with title?

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  • Hosting Microsoft Office application inside Silverlight 4?

    - by Ivan Zlatanov
    I know that Silverlight 4 has the support for COM interop via the AutomationFactory class. dynamic excel = AutomationFactory.CreateObject( "Excel.Application" ); excel.Visible = true; Easy. But this creates a separate process for the COM object. What I am missing here is if I am actually able to actually host the office document inside my silverlight application - in a ContentPresenter for example? Thanks in advance.

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  • jQuery RadioButton index

    - by Tomas
    Hello How to get checked RadioButton Index using jQuery? I need to read it and save to cookies to load status later using code $('input[name="compression"]')[{Reading from cookies code}].checked = true; 1<input name="compression" type="radio" value="1" checked="checked" /> 2<input name="compression" type="radio" value="2" /> 3<input name="compression" type="radio" value="3" /> Regards Tomas

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