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  • WPF Image change source when button is disabled

    - by Taylor
    Hi, I'm trying to show a different image when the button is disabled. Should be easy with triggers, right?! For some reason, I have not been able to get the images to switch. I've tried setting triggers on both the image and button. What is wrong with what I have below? How can I change the image source when the button is enabled/disabled? Thanks! <Button x:Name="rleft" Command="{Binding Path=Operation}" CommandParameter="{x:Static vm:Ops.OpA}"> <Button.Content> <StackPanel> <Image Width="24" Height="24" RenderOptions.BitmapScalingMode="NearestNeighbor" SnapsToDevicePixels="True" Source="/MyAssembly;component/images/enabled.png"> <Image.Style> <Style> <Style.Triggers> <DataTrigger Binding="{Binding ElementName=rleft, Path=Button.IsEnabled}" Value="False"> <Setter Property="Image.Source" Value="/MyAssembly;component/images/disabled.png" /> </DataTrigger> </Style.Triggers> </Style> </Image.Style> </Image> </StackPanel> </Button.Content> </Button>

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  • intelligent path truncation/ellipsis for display

    - by peterchen
    I am looking for an existign path truncation algorithm (similar to what the Win32 static control does with SS_PATHELLIPSIS) for a set of paths that should focus on the distinct elements. For example, if my paths are like this: Unit with X/Test 3V/ Unit with X/Test 4V/ Unit with X/Test 5V/ Unit without X/Test 3V/ Unit without X/Test 6V/ Unit without X/2nd Test 6V/ When not enough display space is available, they should be truncated to something like this: ...with X/...3V/ ...with X/...4V/ ...with X/...5V/ ...without X/...3V/ ...without X/...6V/ ...without X/2nd ...6V/ (Assuming that an ellipsis generally is shorter than three letters). This is just an example of a rather simple, ideal case (e.g. they'd all end up at different lengths now, and I wouldn't know how to create a good suggestion when a path "Thingie/Long Test/" is added to the pool). There is no given structure of the path elements, they are assigned by the user, but often items will have similar segments. It should work for proportional fonts, so the algorithm should take a measure function (and not call it to heavily) or generate a suggestion list. Data-wise, a typical use case would contain 2..4 path segments anf 20 elements per segment. I am looking for previous attempts into that direction, and if that's solvable wiht sensible amount of code or dependencies.

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  • How can i use complextype class or multi type class is it generic collection?

    - by programmerist
    i need a complex returning type. i have 4 class returning types COMPLEXTYPE must include Company, Muayene, Radyoloji, Satis because i must return data switch case situation how can i do? Maybe i need generic collections How can i do that? public class GenoTipController { public COMPLEXTYPE Generate(DataModelType modeltype) { _Company company = null; _Muayene muayene = null; _Radyoloji radyoloji = null; _Satis satis = null; switch (modeltype) { case DataModelType.Radyoloji: radyoloji = new Radyoloji(); return radyoloji; break; case DataModelType.Satis: satis = new Satis(); return satis; break; case DataModelType.Muayene: muayene = new Muayene(); return muayene; break; case DataModelType.Company: company = new Company(); return company; break; default: break; } } } public class CompanyView { public static List GetPersonel() { GenoTipController controller = new GenoTipController(); _Company company = controller.Generate(DataModelType.Company); return company.GetPersonel(); } } public enum DataModelType { Radyoloji, Satis, Muayene, Company }

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  • ClassNotFoundException when connecting to Mysql with JDBC

    - by Jacob Lyles
    I'm getting the following error when I try to run a simple Java JDBC program at the command line: Exception in thread "main" java.lang.NoClassDefFoundError: LoadDriver/java Caused by: java.lang.ClassNotFoundException: LoadDriver.java at java.net.URLClassLoader$1.run(URLClassLoader.java:200) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:188) at java.lang.ClassLoader.loadClass(ClassLoader.java:315) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:330) at java.lang.ClassLoader.loadClass(ClassLoader.java:250) at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:398) Here's the simple Java program, copied right out of the JDBC docs: import java.sql.Connection; import java.sql.DriverManager; import java.sql.SQLException; // Notice, do not import com.mysql.jdbc.* // or you will have problems! public class LoadDriver { public static void main(String[] args) { try { // The newInstance() call is a work around for some // broken Java implementations Class.forName("com.mysql.jdbc.Driver").newInstance(); } catch (Exception ex) { throw ex; // handle the error } } } Problem is, I'm bloody sure my bash shell $ClASSPATH variable is pointed at the correct .jar file. To be sure, I copied the JDBC .jar to the same directory as my program and ran it as follows: java -classpath ./mysql-connector-java-5.1.12-bin.jar LoadDriver.java I still get the same error. I'm running under Mac OSX, if it matters.

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  • Basic example of placing two component on one JPanel container?

    - by Bernard
    Here is my code to add to component (JTextArea and JList) to a panel and put it on the frame. Can I divide half/half by BorderLayout? If yes why mine looks messy one stays up one down? What is the other alternative? Regards, Bernard import java.awt.*; import javax.swing.BorderFactory; import javax.swing.border.Border; import javax.swing.JList; import javax.swing.JScrollPane; import javax.swing.JPanel; import javax.swing.JFrame; import javax.swing.JTextArea; public class SimpleBorder { public static void main(String[] args) { JFrame frame = new JFrame(); frame.setSize(500,500); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); Border etched = (Border) BorderFactory.createEtchedBorder(); String[] items = {"A", "B", "C", "D"}; JList list = new JList(items); JTextArea text = new JTextArea(10, 40); JScrollPane scrol = new JScrollPane(text); JScrollPane scrol2 = new JScrollPane(list); JPanel panel= new JPanel(); panel.add(scrol2,BorderLayout.WEST); panel.add(scrol, BorderLayout.EAST); panel.setBorder(etched); frame.add(panel); frame.setVisible(true); } }

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  • executing stored procedure from Spring-Hibernate using Annotations

    - by HanuAthena
    I'm trying to execute a simple stored procedure with Spring/Hibernate using Annotations. Here are my code snippets: DAO class: public class UserDAO extends HibernateDaoSupport { public List selectUsers(final String eid){ return (List) getHibernateTemplate().execute(new HibernateCallback() { public Object doInHibernate(Session session) throws HibernateException, SQLException { Query q = session.getNamedQuery("SP_APPL_USER"); System.out.println(q); q.setString("eid", eid); return q.list(); } }); } } my entity class: @Entity @Table(name = "APPL_USER") @Inheritance(strategy = InheritanceType.SINGLE_TABLE) @DiscriminatorFormula(value = "SUBSCRIBER_IND") @DiscriminatorValue("N") @NamedQuery(name = "req.all", query = "select n from Requestor n") @org.hibernate.annotations.NamedNativeQuery(name = "SP_APPL_USER", query = "call SP_APPL_USER(?, :eid)", callable = true, readOnly = true, resultClass = Requestor.class) public class Requestor { @Id @Column(name = "EMPL_ID") public String getEmpid() { return empid; } public void setEmpid(String empid) { this.empid = empid; } @Column(name = "EMPL_FRST_NM") public String getFirstname() { return firstname; } ... } public class Test { public static void main(String[] args) { ApplicationContext ctx = new ClassPathXmlApplicationContext( "applicationContext.xml"); APFUser user = (APFUser)ctx.getBean("apfUser"); List selectUsers = user.getUserDAO().selectUsers("EMP456"); System.out.println(selectUsers); } } and the stored procedure: create or replace PROCEDURE SP_APPL_USER (p_cursor out sys_refcursor, eid in varchar2) as empId varchar2(8); fname varchar2(50); lname varchar2(50); begin empId := null; fname := null; lname := null; open p_cursor for select l.EMPL_ID, l.EMPL_FRST_NM, l.EMPL_LST_NM into empId, fname, lname from APPL_USER l where l.EMPL_ID = eid; end; If i enter invalid EID, its returning empty list which is OK. But when record is there, following exception is thrown: Exception in thread "main" org.springframework.jdbc.BadSqlGrammarException: Hibernate operation: could not execute query; bad SQL grammar [call SP_APPL_USER(?, ?)]; nested exception is java.sql.SQLException: Invalid column name Do I need to modify the entity(Requestor.class) ? How will the REFCURSOR be converted to the List? The stored procedure is expected to return more than one record.

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  • How to call a new thread from button click

    - by Lynnooi
    Hi, I'm trying to call a thread on a button click (btn_more) but i cant get it right. The thread is to get some data and update the images. The problem i have is if i only update 4 or 5 images then it works fine. But if i load more than 5 images i will get a force close. At times when the internet is slow I will face the same problem too. Can please help me to solve this problem or provide me some guidance? Here is the error i got from LogCat: 04-19 18:51:44.907: ERROR/AndroidRuntime(1034): Uncaught handler: thread main exiting due to uncaught exception 04-19 18:51:44.927: ERROR/AndroidRuntime(1034): java.lang.NullPointerException 04-19 18:51:44.927: ERROR/AndroidRuntime(1034): at mobile9.android.gallery.GalleryWallpapers.setWallpaperThumb(GalleryWallpapers.java:383) 04-19 18:51:44.927: ERROR/AndroidRuntime(1034): at mobile9.android.gallery.GalleryWallpapers.access$4(GalleryWallpapers.java:320) 04-19 18:51:44.927: ERROR/AndroidRuntime(1034): at mobile9.android.gallery.GalleryWallpapers$1.handleMessage(GalleryWallpapers.java:266) 04-19 18:51:44.927: ERROR/AndroidRuntime(1034): at android.os.Handler.dispatchMessage(Handler.java:99) 04-19 18:51:44.927: ERROR/AndroidRuntime(1034): at android.os.Looper.loop(Looper.java:123) 04-19 18:51:44.927: ERROR/AndroidRuntime(1034): at android.app.ActivityThread.main(ActivityThread.java:4310) 04-19 18:51:44.927: ERROR/AndroidRuntime(1034): at java.lang.reflect.Method.invokeNative(Native Method) 04-19 18:51:44.927: ERROR/AndroidRuntime(1034): at java.lang.reflect.Method.invoke(Method.java:521) 04-19 18:51:44.927: ERROR/AndroidRuntime(1034): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860) 04-19 18:51:44.927: ERROR/AndroidRuntime(1034): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618) 04-19 18:51:44.927: ERROR/AndroidRuntime(1034): at dalvik.system.NativeStart.main(Native Method) My Code: public class GalleryWallpapers extends Activity implements Runnable { public static String MODEL = android.os.Build.MODEL ; private static final String rootURL = "http://www.uploadhub.com/mobile9/gallery/c/"; private int wallpapers_count = 0; private int ringtones_count = 0; private int index = 0; private int folder_id; private int page; private int page_counter = 1; private String family; private String keyword; private String xmlURL = ""; private String thread_op = "xml"; private ImageButton btn_back; private ImageButton btn_home; private ImageButton btn_filter; private ImageButton btn_search; private TextView btn_more; private ProgressDialog pd; GalleryExampleHandler myExampleHandler = new GalleryExampleHandler(); Context context = GalleryWallpapers.this.getBaseContext(); Drawable image; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); MODEL = "HTC Legend"; // **needs to be remove after testing** try { MODEL = URLEncoder.encode(MODEL,"UTF-8"); } catch (UnsupportedEncodingException e) { // TODO Auto-generated catch block e.printStackTrace(); } requestWindowFeature(Window.FEATURE_NO_TITLE); setContentView(R.layout.gallerywallpapers); Bundle b = this.getIntent().getExtras(); family = b.getString("fm").trim(); folder_id = Integer.parseInt(b.getString("fi")); keyword = b.getString("kw").trim(); page = Integer.parseInt(b.getString("page").trim()); WindowManager w = getWindowManager(); Display d = w.getDefaultDisplay(); final int width = d.getWidth(); final int height = d.getHeight(); xmlURL = rootURL + "wallpapers/1/?output=rss&afm=wallpapers&mdl=" + MODEL + "&awd=" + width + "&aht=" + height; if (folder_id > 0) { xmlURL = xmlURL + "&fi=" + folder_id; } pd = ProgressDialog.show(GalleryWallpapers.this, "", "Loading...", true, false); Thread thread = new Thread(GalleryWallpapers.this); thread.start(); btn_more = (TextView) findViewById(R.id.btn_more); btn_more.setOnClickListener(new View.OnClickListener() { public void onClick(View view) { myExampleHandler.filenames.clear(); myExampleHandler.authors.clear(); myExampleHandler.duration.clear(); myExampleHandler.fileid.clear(); btn_more.setBackgroundResource(R.drawable.btn_more_click); page = page + 1; thread_op = "xml"; xmlURL = rootURL + "wallpapers/1/?output=rss&afm=wallpapers&mdl=" + MODEL + "&awd=" + width + "&aht=" + height; xmlURL = xmlURL + "&pg2=" + page; index = 0; pd = ProgressDialog.show(GalleryWallpapers.this, "", "Loading...", true, false); Thread thread = new Thread(GalleryWallpapers.this); thread.start(); } }); } public void run() { if(thread_op.equalsIgnoreCase("xml")){ readXML(); } else if(thread_op.equalsIgnoreCase("getImg")){ getWallpaperThumb(); } handler.sendEmptyMessage(0); } private Handler handler = new Handler() { @Override public void handleMessage(Message msg) { int count = 0; if (!myExampleHandler.filenames.isEmpty()){ count = myExampleHandler.filenames.size(); } count = 6; if(thread_op.equalsIgnoreCase("xml")){ pd.dismiss(); thread_op = "getImg"; btn_more.setBackgroundResource(R.drawable.btn_more); } else if(thread_op.equalsIgnoreCase("getImg")){ setWallpaperThumb(); index++; if (index < count){ Thread thread = new Thread(GalleryWallpapers.this); thread.start(); } } } }; private void readXML(){ if (xmlURL.length() != 0) { try { /* Create a URL we want to load some xml-data from. */ URL url = new URL(xmlURL); /* Get a SAXParser from the SAXPArserFactory. */ SAXParserFactory spf = SAXParserFactory.newInstance(); SAXParser sp = spf.newSAXParser(); /* Get the XMLReader of the SAXParser we created. */ XMLReader xr = sp.getXMLReader(); /* * Create a new ContentHandler and apply it to the * XML-Reader */ xr.setContentHandler(myExampleHandler); /* Parse the xml-data from our URL. */ xr.parse(new InputSource(url.openStream())); /* Parsing has finished. */ /* * Our ExampleHandler now provides the parsed data to * us. */ ParsedExampleDataSet parsedExampleDataSet = myExampleHandler .getParsedData(); } catch (Exception e) { //showDialog(DIALOG_SEND_LOG); } } } private void getWallpaperThumb(){ int i = this.index; if (!myExampleHandler.filenames.elementAt(i).toString().equalsIgnoreCase("")){ image = ImageOperations(context, myExampleHandler.thumbs.elementAt(i).toString(), "image.jpg"); } } private void setWallpaperThumb(){ int i = this.index; if (myExampleHandler.filenames.elementAt(i).toString() != null) { String file_info = myExampleHandler.filenames.elementAt(i).toString(); String author = "\nby " + myExampleHandler.authors.elementAt(i).toString(); final String folder = myExampleHandler.folder_id.elementAt(folder_id).toString(); final String fid = myExampleHandler.fileid.elementAt(i).toString(); ImageView imgView = new ImageView(context); TextView tv_filename = null; TextView tv_author = null; switch (i + 1) { case 1: imgView = (ImageView) findViewById(R.id.image1); tv_filename = (TextView) findViewById(R.id.filename1); tv_author = (TextView) findViewById(R.id.author1); break; case 2: imgView = (ImageView) findViewById(R.id.image2); tv_filename = (TextView) findViewById(R.id.filename2); tv_author = (TextView) findViewById(R.id.author2); break; case 3: imgView = (ImageView) findViewById(R.id.image3); tv_filename = (TextView) findViewById(R.id.filename3); tv_author = (TextView) findViewById(R.id.author3); break; case 4: . . . . . case 10: imgView = (ImageView) findViewById(R.id.image10); tv_filename = (TextView) findViewById(R.id.filename10); tv_author = (TextView) findViewById(R.id.author10); break; } if (image.getIntrinsicHeight() > 0) { imgView.setImageDrawable(image); } else { imgView.setImageResource(R.drawable.default_wallpaper); } tv_filename.setText(file_info); tv_author.setText(author); imgView.setOnClickListener(new View.OnClickListener() { public void onClick(View view) { // Perform action on click } }); } } private Drawable ImageOperations(Context ctx, String url, String saveFilename) { try { InputStream is = (InputStream) this.fetch(url); Drawable d = Drawable.createFromStream(is, "src"); return d; } catch (MalformedURLException e) { e.printStackTrace(); return null; } catch (IOException e) { e.printStackTrace(); return null; } } }

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  • Setting up DrJava to work through Friedman / Felleisen "A Little Java"

    - by JDelage
    All, I'm going through the Friedman & Felleisen book "A Little Java, A Few Patterns". I'm trying to type the examples in DrJava, but I'm getting some errors. I'm a beginner, so I might be making rookie mistakes. Here is what I have set-up: public class ALittleJava { //ABSTRACT CLASS POINT abstract class Point { abstract int distanceToO(); } class CartesianPt extends Point { int x; int y; int distanceToO(){ return((int)Math.sqrt(x*x+y*y)); } CartesianPt(int _x, int _y) { x=_x; y=_y; } } class ManhattanPt extends Point { int x; int y; int distanceToO(){ return(x+y); } ManhattanPt(int _x, int _y){ x=_x; y=_y; } } } And on the main's side: public class Main{ public static void main (String [] args){ Point y = new ManhattanPt(2,8); System.out.println(y.distanceToO()); } } The compiler cannot find the symbols Point and ManhattanPt in the program. If I precede each by ALittleJava., I get another error in the main, i.e., an enclosing instance that contains ALittleJava.ManhattanPt is required I've tried to find ressources on the 'net, but the book must have a pretty confidential following and I couldn't find much. Thank you all. JDelage

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  • Empty data problem - data layer or DAL?

    - by luckyluke
    I designing the new App now and giving the following question a lot of thought. I consume a lot of data from the warehouse, and the entities have a lot of dictionary based values (currency, country, tax-whatever data) - dimensions. I cannot be assured though that there won't be nulls. So I am thinking: create an empty value in each of teh dictionaries with special keyID - ie. -1 do the ETL (ssis) do the correct stuff and insert -1 where it needs to let the DAL know that -1 is special (Static const whatever thing) don't care in the code to check for nullness of dictionary entries because THEY will always have a value But maybe I should be thinking: import data AS IS let the DAL do the thinking using empty record Pattern still don't care in the code because business layer will have what it needs from DAL. I think is more of a approach thing but maybe i am missing something important here... What do You think? Am i clear? Please don't confuse it with empty record problem. I do use emptyCustomer think all the time and other defaults too.

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  • Problem Linking Boost Filesystem Library in Microsoft Visual C++

    - by Scott
    Hello. I am having trouble getting my project to link to the Boost (version 1.37.0) Filesystem lib file in Microsoft Visual C++ 2008 Express Edition. The Filesystem library is not a header-only library. I have been following the Getting Started on Windows guide posted on the official boost web page. Here are the steps I have taken: I used bjam to build the complete set of lib files using: bjam --build-dir="C:\Program Files\boost\build-boost" --toolset=msvc --build-type=complete I copied the /libs directory (located in C:\Program Files\boost\build-boost\boost\bin.v2) to C:\Program Files\boost\boost_1_37_0\libs. In Visual C++, under Project Properties Additional Library Directories I added these paths: C:\Program Files\boost\boost_1_37_0\libs C:\Program Files\boost\boost_1_37_0\libs\filesystem\build\msvc-9.0express\debug\link-static\threading-multi I added the second one out of desperation. It is the exact directory where libboost_system-vc90-mt-gd-1_37.lib resides. In Configuration Properties C/C++ General Additional Include Directories I added the following path: C:\Program Files\boost\boost_1_37_0 Then, to put the icing on the cake, under Tools Options VC++ Directories Library files, I added the same directories mentioned in step 3. Despite all this, when I build my project I get the following error: fatal error LNK1104: cannot open file 'libboost_system-vc90-mt-gd-1_37.lib' Additionally, here is the code that I am attempting to compile as well as a screen shot of the aformentioned directory where the (assumedly correct) lib file resides: #include "boost/filesystem.hpp" // includes all needed Boost.Filesystem declarations #include <iostream> // for std::cout using boost::filesystem; // for ease of tutorial presentation; // a namespace alias is preferred practice in real code using namespace std; int main() { cout << "Hello, world!" << endl; return 0; } Can anyone help me out? Let me know if you need to know anything else. As always, thanks in advance.

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  • Opengl Triangle instead of square

    - by Dave
    Im trying to create a spinning square inside of xcode using opengl but instead for some reason I have a spinning triangle? I'm doing this inside of sio2 but I dont think this is the problem. Here is the triangle: http://img220.imageshack.us/img220/7051/snapzproxscreensnapz001.png Here is my code: void templateRender( void ) { const GLfloat squareVertices[] ={ 100.0f, -100.0f, 100.0f, -100.0f, -100.0f, 100.0f, 100.0f, 100.0f, }; const unsigned char squareColors[] = { 255, 255, 0, 255, 0, 255, 255, 255, 0, 0, 0, 0, 255, 0, 255, 255, }; glMatrixMode( GL_MODELVIEW ); glLoadIdentity(); glClear( GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT ); // Your rendering code here... sio2WindowEnter2D( sio2->_SIO2window, 0.0f, 1.0f ); { glVertexPointer( 2, GL_FLOAT, 0, squareVertices ); glEnableClientState(GL_VERTEX_ARRAY); //set up the color array glColorPointer( 4, GL_UNSIGNED_BYTE, 0, squareColors ); glEnableClientState( GL_COLOR_ARRAY ); glTranslatef( sio2->_SIO2window->scl->x * 0.5f, sio2->_SIO2window->scl->y * 0.5f, 0.0f ); static float rotz = 0.0f; glRotatef( rotz, 0.0f, 0.0f, 1.0f ); rotz += 90.0f * sio2->_SIO2window->d_time; glDrawArrays(GL_TRIANGLE_STRIP, 0, 4); } sio2WindowLeave2D(); }

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  • PHP/Java Bridge - Access Java objects in PHP

    - by Omer Hassan
    I have a Red5 application which defines some public Java methods. When I start the server, an object of the application class gets created. I am trying to call the public methods of the application class from PHP using the existing instance of the Java application class. So here's my Java application: public class App extends org.red5.server.adapter.ApplicationAdapter { public boolean appStart(IScope app) { // This method gets called when the application starts // and an object of this App class is created. return true; } // This is the method I would like to call from PHP. public void f() { } } From PHP, I would like to get access to the App object that is created and call the method f() on it. I have tried playing around with this thing called "context". So in the Java method App.appStart(), I did this: // Save a reference to this App object to be retrieved later in PHP. new PhpScriptContextFactory().getContext().put("x", this); And in PHP, I tried to access the saved object like this: require_once("http://localhost:5080/JavaBridge/java/Java.inc"); var_dump(java_is_null(java_context()->get("x"))); Unfortunately, the java_is_null() function in PHP returns true. I also tried saving the App object in a static variable of App class but when I access that variable in PHP, its value is null.

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  • Find max integer size that a floating point type can handle without loss of precision

    - by Checkers
    Double has range more than a 64-bit integer, but its precision is less dues to its representation (since double is 64-bit as well, it can't fit more actual values). So, when representing larger integers, you start to lose precision in the integer part. #include <boost/cstdint.hpp> #include <limits> template<typename T, typename TFloat> void maxint_to_double() { T i = std::numeric_limits<T>::max(); TFloat d = i; std::cout << std::fixed << i << std::endl << d << std::endl; } int main() { maxint_to_double<int, double>(); maxint_to_double<boost::intmax_t, double>(); maxint_to_double<int, float>(); return 0; } This prints: 2147483647 2147483647.000000 9223372036854775807 9223372036854775800.000000 2147483647 2147483648.000000 Note how max int can fit into a double without loss of precision and boost::intmax_t (64-bit in this case) cannot. float can't even hold an int. Now, the question: is there a way in C++ to check if the entire range of a given integer type can fit into a loating point type without loss of precision? Preferably, it would be a compile-time check that can be used in a static assertion, and would not involve enumerating the constants the compiler should know or can compute.

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  • How to determine which inheriting class is using an abstract class' methods.

    - by Kin
    In my console application have an abstract Factory class "Listener" which contains code for listening and accepting connections, and spawning client classes. This class is inherited by two more classes (WorldListener, and MasterListener) that contain more protocol specific overrides and functions. I also have a helper class (ConsoleWrapper) which encapsulates and extends System.Console, containing methods for writing to console info on what is happening to instances of the WorldListener and MasterListener. I need a way to determine in the abstract ListenerClass which Inheriting class is calling its methods. Any help with this problem would be greatly appreciated! I am stumped :X Simplified example of what I am trying to do. abstract class Listener { public void DoSomething() { if(inheriting class == WorldListener) ConsoleWrapper.WorldWrite("Did something!"); if(inheriting class == MasterListener) ConsoleWrapper.MasterWrite("Did something!"); } } public static ConsoleWrapper { public void WorldWrite(string input) { System.Console.WriteLine("[World] {0}", input); } } public class WorldListener : Listener { public void DoSomethingSpecific() { ConsoleWrapper.WorldWrite("I did something specific!"); } } public void Main() { new WorldListener(); new MasterListener(); } Expected output [World] Did something! [World] I did something specific! [Master] Did something! [World] I did something specific!

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  • java.net.SocketException: Software caused connection abort: recv failed; Causes and cures?

    - by IVR Avenger
    Hi, all. I've got an application running on Apache Tomcat 5.5 on a Win2k3 VM. The application serves up XML to be consumed by some telephony appliances as part of our IVR infrastructure. The application, in turn, receives its information from a handful of SOAP services. This morning, the SOAP services were timing out intermittently, causing all sorts of Exceptions. Once these stopped, I noticed that our application was still performing very slowly, in that it took it a long time to render and deliver pages. This sluggishness was noticed both on the appliances that consume the Tomcat output, and from a simple test of requesting some static documents from my web browser. Restarting Tomcat immediately resolved the issue. Cracking open the localhost log, I see a ton of these errors, right up until I restarted Tomcat: WARNING: Exception thrown whilst processing POSTed parameters java.net.SocketException: Software caused connection abort: recv failed After a big of Googling, my working theory is that the SOAP issue caused my users to get errors, which caused them to make more requests, which put an increased load on the application. This caused it to run out of available sockets to handle incoming requests. So, here's my quandary: 1. Is this a valid hypothesis, or am I just in over my head with HTTP and Tomcat? 2. If this is a valid hypothesis, is there a way to increase the size of the "socket queue", so that this doesn't happen in the future? Thanks! IVR Avenger

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  • Possible to Inspect Innards of Core C# Functionality

    - by Nick Babcock
    I was struck today, with the inclination to compare the innards of Buffer.BlockCopy and Array.CopyTo. I am curious to see if Array.CopyTo called Buffer.BlockCopy behind the scenes. There is no practical purpose behind this, I just want to further my understanding of the C# language and how it is implemented. Don't jump the gun and accuse me of micro-optimization, but you can accuse me of being curious! When I ran ILasm on mscorlib.dll I received this for Array.CopyTo .method public hidebysig newslot virtual final instance void CopyTo(class System.Array 'array', int32 index) cil managed { // Code size 0 (0x0) } // end of method Array::CopyTo and this for Buffer.BlockCopy .method public hidebysig static void BlockCopy(class System.Array src, int32 srcOffset, class System.Array dst, int32 dstOffset, int32 count) cil managed internalcall { .custom instance void System.Security.SecuritySafeCriticalAttribute::.ctor() = ( 01 00 00 00 ) } // end of method Buffer::BlockCopy Which, frankly, baffles me. I've never run ILasm on a dll/exe I didn't create. Does this mean that I won't be able to see how these functions are implemented? Searching around only revealed a stackoverflow question, which Marc Gravell said [Buffer.BlockCopy] is basically a wrapper over a raw mem-copy While insightful, it doesn't answer my question if Array.CopyTo calls Buffer.BlockCopy. I'm specifically interested in if I'm able to see how these two functions are implemented, and if I had future questions about the internals of C#, if it is possible for me to investigate it. Or am I out of luck?

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  • System.Dynamic bug?

    - by ControlFlow
    While I playing with the C# 4.0 dynamic, I found strange things happening with the code like this: using System.Dynamic; sealed class Foo : DynamicObject { public override bool TryInvoke( InvokeBinder binder, object[] args, out object result) { result = new object(); return true; } static void Main() { dynamic foo = new Foo(); var t1 = foo(0); var t2 = foo(0); var t3 = foo(0); var t4 = foo(0); var t5 = foo(0); } } Ok, it works but... take a look at IntelliTrace window: So every invokation (and other operations too on dynamic object) causes throwing and catching strange exceptions twice! I understand, that sometimes exceptions mechanism may be used for optimizations, for example first call to dynamic may be performed to some stub delegate, that simply throws exception - this may be like a signal to dynamic binder to resolve an correct member and re-point delegate. Next call to the same delegate will be performed without any checks. But... behavior of the code above looks very strange. Maybe throwing and catching exceptions twice per any operation on DynamicObject - is a bug?

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  • Run time error: what's wrong?

    - by javacode
    I am getting run time error import javax.mail.*; import javax.mail.internet.*; import java.util.*; public class SendMail { public static void main(String [] args)throws MessagingException { SendMail sm=new SendMail(); sm.postMail(new String[]{"[email protected]"},"hi","hello","[email protected]"); } public void postMail( String recipients[ ], String subject, String message , String from) throws MessagingException { boolean debug = false; //Set the host smtp address Properties props = new Properties(); props.put("mail.smtp.host", "webmail.emailmyname.com"); // create some properties and get the default Session Session session = Session.getDefaultInstance(props, null); session.setDebug(debug); // create a message Message msg = new MimeMessage(session); // set the from and to address InternetAddress addressFrom = new InternetAddress(from); msg.setFrom(addressFrom); InternetAddress[] addressTo = new InternetAddress[recipients.length]; for (int i = 0; i < recipients.length; i++) { addressTo[i] = new InternetAddress(recipients[i]); } msg.setRecipients(Message.RecipientType.TO, addressTo); // Optional : You can also set your custom headers in the Email if you Want msg.addHeader("MyHeaderName", "myHeaderValue"); // Setting the Subject and Content Type msg.setSubject(subject); msg.setContent(message, "text/plain"); Transport.send(msg); } } Error Exception in thread "main" java.lang.NoClassDefFoundError: SendMail Caused by: java.lang.ClassNotFoundException: SendMail at java.net.URLClassLoader$1.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) Could not find the main class: SendMail. Program will exit.

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  • Problems with Acitivity LifeCycle with VideoView playback.

    - by Alex Volovoy
    Hi all i've ran into another problems with VideoView. Then video is playing, and i put device asleep, using hard button, onPause is called. But it followed by 03-17 11:26:33.779: WARN/ActivityManager(884): Activity pause timeout for HistoryRecord{4359f620 com.package/com.package.VideoViewActivity} And then i have onStart/onResume again and Video starts playing. I've try to move code around onStart/onStop - doesn't seems to make difference. sample code : public class VideoViewActivity extends Activity { private String path = ""; private VideoView mVideoView; private static final String MEDIA_URL = "media_url"; @Override public void onCreate(Bundle icicle) { super.onCreate(icicle); setContentView(R.layout.videoview); mVideoView = (VideoView)findViewById(R.id.surface_view); path = getIntent().getStringExtra(MEDIA_URL); } @Override public void onResume() { super.onResume(); mVideoView.setVideoPath(path); mVideoView.setMediaController(new MediaController(this)); mVideoView.requestFocus(); mVideoView.start(); } @Override public void onPause() { super.onPause(); mVideoView.stopPlayback(); mVideoView.setMediaController(null); } }

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  • How to disable auto-generated WCF configuration

    - by user351025
    Every time my program runs vs adds the default configuration to my app.config file. At that run it works fine, but at the next run it actually tries to read the config. The problem is that the default configuration has errors, it adds the attribute "Address", but attritbutes are not allowed to have capitals so it throws an exception. This means I have to remove the bad section every run! I've tried to configure the .config but it gives errors. Here is the code that I use to host the server: private static System.Threading.AutoResetEvent stopFlag = new System.Threading.AutoResetEvent(false); ServiceHost host = new ServiceHost(typeof(Service), new Uri("http://localhost:8000")); host.AddServiceEndpoint(typeof(IService), new BasicHttpBinding(), "ChessServer"); host.Open(); stopFlag.WaitOne(); host.Close(); Here is the client code that calls the server: ChannelFactory<IChessServer> scf; scf = new ChannelFactory<IService> (new BasicHttpBinding(), "http://localhost:8000"); IService service = scf.CreateChannel(); Thanks for any help.

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  • get cells odf a JTable

    - by tuxou
    hi how to display a row of a jtable in a from of JTextField when click on the row, ( I need this to edit the data base from the JTable ) My table model static class TableDataModel extends AbstractTableModel { private List nomColonnes; private List tableau; public TableDataModel(List nomColonnes, List tableau){ this.nomColonnes = nomColonnes; majDonnees(tableau); } public void majDonnees(List nouvellesDonnees){ this.tableau = nouvellesDonnees; fireTableDataChanged(); } public int getRowCount(){ return tableau.size(); } public int getColumnCount(){ return nomColonnes.size(); } public Object getValueAt(int row, int col){ return ((ArrayList)( tableau.get(row))).get(col); } public String getColumnName(int col){ return nomColonnes.get(col).toString(); } public Class getColumnClass(int c) { return getValueAt(0,c).getClass(); } public boolean isCellEditable(int row, int col){ return true; } public void setValueAt(Object value, int row, int col) { ((List)tableau.get(row)).set(col,value); fireTableCellUpdated(row, col); //i suppose i should update the database here } }

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  • Unable to upload large files on FTP using Apache commons-net-3.1

    - by Nitin
    I am trying to upload the one large file ( more than 8 MB) using storeFile(remote, local) method of FTPClient but it results false.It get uploaded with some extra bytes.Following is the code with Output: public class Main { public static void main(String[] args) { FTPClient client = new FTPClient(); FileInputStream fis = null; try { client.connect("208.106.181.143"); client.setFileTransferMode(client.BINARY_FILE_TYPE); client.login("abc", "java"); int reply = client.getReplyCode(); System.out.println("Received Reply from FTP Connection:" + reply); if(FTPReply.isPositiveCompletion(reply)){ System.out.println("Connected Success"); } client.changeWorkingDirectory("/"+"Everbest"+"/"); client.makeDirectory("ETPSupplyChain5.3-EvbstSP3"); client.changeWorkingDirectory("/"+"Everbest"+"/"+"ETPSupplyChain5.3-EvbstSP3"+"/"); FTPFile[] names = client.listFiles(); String filename = "E:\\Nitin\\D-Drive\\Installer.rar"; fis = new FileInputStream(filename); boolean result = client.storeFile("Installer.rar", fis); int replyAfterupload = client.getReplyCode(); System.out.println("Received Reply from FTP Connection replyAfterupload:" + replyAfterupload); System.out.println("result:"+result); for (FTPFile name : names) { System.out.println("Name = " + name); } client.logout(); fis.close(); client.disconnect(); } catch (SocketException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } o/p: Received Reply from FTP Connection:230 Connected Success 32 /Everbest/ETPSupplyChain5.3-EvbstSP3 Received Reply from FTP Connection replyAfterupload:150 result:false

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  • SWT: problems with clicking button after using setEnabled() on Linux

    - by Laimoncijus
    Hi, I have a strange case with SWT and Button after using setEnabled() - seems if I disable and enable button at least once - I cannot properly click with mouse on it anymore... Already minify code to very basic: import org.eclipse.swt.SWT; import org.eclipse.swt.events.SelectionEvent; import org.eclipse.swt.events.SelectionListener; import org.eclipse.swt.layout.GridLayout; import org.eclipse.swt.widgets.Button; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Shell; public class TestButton { public TestButton() { Display display = new Display(); Shell shell = new Shell(display); GridLayout mainLayout = new GridLayout(); shell.setLayout(mainLayout); shell.setSize(100, 100); Button testButton = new Button(shell, SWT.PUSH); testButton.addSelectionListener(new TestClickListener()); testButton.setText("Click me!"); //testButton.setEnabled(false); //testButton.setEnabled(true); shell.open(); while (!shell.isDisposed()) { if (!display.readAndDispatch()) display.sleep(); } display.dispose(); } class TestClickListener implements SelectionListener { @Override public void widgetDefaultSelected(SelectionEvent e) { } @Override public void widgetSelected(SelectionEvent e) { System.out.println("Click!"); } } public static void main(String[] args) { new TestButton(); } } When I keep these 2 lines commented out - I can properly click on a button and always get "Click!" logged, but if I uncomment them - then I can't click on button properly with mouse anymore - button visually seems to be clicked, but nothing is logged... Am I doing something wrong here? Or maybe it's some kind of bug on Linux platform? Because on Mac running the same code I never experienced such problems... Thanks for any hint! P.S. Running code on Ubuntu 9.10, Gnome + Compiz, Sun Java 1.6.0.16

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  • Draw Rectangle with XNA

    - by mazzzzz
    Hey guys, I was working on game, and wanted to highlight a spot on the screen when something happens, I created a class to do this for me, and found a bit of code to draw the rectangle static private Texture2D CreateRectangle(int width, int height, Color colori) { Texture2D rectangleTexture = new Texture2D(game.GraphicsDevice, width, height, 1, TextureUsage.None, SurfaceFormat.Color);// create the rectangle texture, ,but it will have no color! lets fix that Color[] color = new Color[width * height];//set the color to the amount of pixels in the textures for (int i = 0; i < color.Length; i++)//loop through all the colors setting them to whatever values we want { color[i] = colori; } rectangleTexture.SetData(color);//set the color data on the texture return rectangleTexture;//return the texture } Problem is that the code above is called every update, (60 times a second), and it was not written with optimization in mind, I have no clue how else to write a code to do this though. It needs to be extremely fast (the code above freezes the game, which has only skeleton code right now).. Any suggestions. Note: Any new code would be great (WireFrame/Fill are both fine). I would like to be able to specify color. Something to point in the right direction would be great, Thanks, Max

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  • How to Manage project in this scenario

    - by vijay.shad
    Hi All, I am working on a web application which has got good amount of static or pre-login pages. These pages can have some simple forms as well where we would like to capture the visitor's details. Post login, I have got my main application. I am confused about the development and deployment architecture of my application. Post login part of my application has a release cycle of 1-2 months while pre-login pages are to be updated on a weekly basis. It is difficult to make a release of pre-login pages as the overall war also contains post-login application & which sometimes is not release ready. Currently, I have got both these parts bundled in the single war project. Please help me by letting me know the best practices whereby I can achieve following: Manage the releases of these two parts independently. I am using Maven. So is there a way I can share the resources, such as CSS, images etc between these two parts. Header and footer of my application is going to be same on pre-login & post-login pages. I was thinking of deploying these apps as two war files in my tomcat container. But then how will I manage the common resources like Css, images etc. Rgds Vijay

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