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• What are the Options for Storing Hierarchical Data in a Relational Database?

  - by orangepips

  Good Overviews One more Nested Intervals vs. Adjacency List comparison: the best comparison of Adjacency List, Materialized Path, Nested Set and Nested Interval I've found. Models for hierarchical data: slides with good explanations of tradeoffs and example usage Representing hierarchies in MySQL: very good overview of Nested Set in particular Hierarchical data in RDBMSs: most comprehensive and well organized set of links I've seen, but not much in the way on explanation Options Ones I am aware of and general features: Adjacency List: Columns: ID, ParentID Easy to implement. Cheap node moves, inserts, and deletes. Expensive to find level (can store as a computed column), ancestry & descendants (Bridge Hierarchy combined with level column can solve), path (Lineage Column can solve). Use Common Table Expressions in those databases that support them to traverse. Nested Set (a.k.a Modified Preorder Tree Traversal) First described by Joe Celko - covered in depth in his book Trees and Hierarchies in SQL for Smarties Columns: Left, Right Cheap level, ancestry, descendants Compared to Adjacency List, moves, inserts, deletes more expensive. Requires a specific sort order (e.g. created). So sorting all descendants in a different order requires additional work. Nested Intervals Combination of Nested Sets and Materialized Path where left/right columns are floating point decimals instead of integers and encode the path information. Bridge Table (a.k.a. Closure Table: some good ideas about how to use triggers for maintaining this approach) Columns: ancestor, descendant Stands apart from table it describes. Can include some nodes in more than one hierarchy. Cheap ancestry and descendants (albeit not in what order) For complete knowledge of a hierarchy needs to be combined with another option. Flat Table A modification of the Adjacency List that adds a Level and Rank (e.g. ordering) column to each record. Expensive move and delete Cheap ancestry and descendants Good Use: threaded discussion - forums / blog comments Lineage Column (a.k.a. Materialized Path, Path Enumeration) Column: lineage (e.g. /parent/child/grandchild/etc...) Limit to how deep the hierarchy can be. Descendants cheap (e.g. LEFT(lineage, #) = '/enumerated/path') Ancestry tricky (database specific queries) Database Specific Notes MySQL Use session variables for Adjacency List Oracle Use CONNECT BY to traverse Adjacency Lists PostgreSQL ltree datatype for Materialized Path SQL Server General summary 2008 offers HierarchyId data type appears to help with Lineage Column approach and expand the depth that can be represented.

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• Need help with tweaking a Dropdown with three options, user selects one - a hidden div appears with correct fields

  - by Jack

  Hello Again, I posted a question on here and got an answer within minutes I'm hoping the wizards on here can help me again. Okay so I'm using a script I found online to try and add this function to a shopping cart form. Here's the setup. I have a payment method dropdown with Visa, Mastercard and Bank Withdrawal as the options. For the credit cards I have one hidden div with a certain set of fields, and for the bank I have another hidden div. Each of the divs have named ID's - #payCredit and #payBank The css for both have margin: 0px and display: none; Here's a peice of javascript I used successfuly on a shipping address checkbox `function toggleLayer( whichLayer ) { var elem, vis; if( document.getElementById ) // this is the way the standards work elem = document.getElementById( whichLayer ); else if( document.all ) // this is the way old msie versions work elem = document.all[whichLayer]; else if( document.layers ) // this is the way nn4 works elem = document.layers[whichLayer]; vis = elem.style; // if the style.display value is blank we try to figure it out here if(vis.display==''&&elem.offsetWidth!=undefined&&elem.offsetHeight!=undefined) vis.display = (elem.offsetWidth!=0&&elem.offsetHeight!=0)?'block':'none'; vis.display = (vis.display==''||vis.display=='block')?'none':'block'; }` I was hoping I could change it slightly to meet my needs. Here's the dropdown <label>Payment Method:</label> <select name="payment" id="payment" class="dropdown3" style="width:8em"> <option selected="selected">Select</option> <option value="Visa" onclick="javascript:toggleLayer('payCredit');">Visa</option> <option value="MasterCard" onclick="javascript:toggleLayer('payCredit');">Mastercard</option> <option value="Direct" onclick="javascript:toggleLayer('payBank');">Direct Withdraw</option> </select></li> The current result is that it kinda works. I can open the dropdown and select Visa and it appears, if I select Visa again it disappears, if I select Visa and then select bank, both appear. You can see what i'm working on here - http://test.sharevetcare.com/bestfriends/cart3.html

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• Setting up apache to view https pages

  - by zac

  I am trying to set up a site using vmware workstation, ubuntu 11.10, and apache2. The site works fine but now the https pages are not showing up. For example if I try to go to https://www.mysite.com/checkout I just see the message Not Found The requested URL /checkout/ was not found on this server. I dont really know what I am doing and have tried a lot of things to get the ssl certificates in there right. A few things I have in there, in my httpd.conf I just have : ServerName localhost In my ports.conf I have : NameVirtualHost *:80 Listen 80 <IfModule mod_ssl.c> # If you add NameVirtualHost *:443 here, you will also have to change # the VirtualHost statement in /etc/apache2/sites-available/default-ssl # to <VirtualHost *:443> # Server Name Indication for SSL named virtual hosts is currently not # supported by MSIE on Windows XP. Listen 443 http </IfModule> <IfModule mod_gnutls.c> Listen 443 http </IfModule> In the /etc/apache2/sites-available/default-ssl : <IfModule mod_ssl.c> <VirtualHost _default_:443> ServerAdmin webmaster@localhost DocumentRoot /var/www <Directory /> Options FollowSymLinks AllowOverride None </Directory> <Directory /var/www/> Options Indexes FollowSymLinks MultiViews AllowOverride None Order allow,deny allow from all </Directory> .... truncated in the sites-available/default I have : <VirtualHost *:80> ServerAdmin webmaster@localhost DocumentRoot /var/www #DocumentRoot /home/magento/site/ <Directory /> Options FollowSymLinks AllowOverride None </Directory> <Directory /var/www/> #<Directory /home/magento/site/> Options Indexes FollowSymLinks MultiViews AllowOverride None Order allow,deny allow from all </Directory> ScriptAlias /cgi-bin/ /usr/lib/cgi-bin/ <Directory "/usr/lib/cgi-bin"> AllowOverride None Options +ExecCGI -MultiViews +SymLinksIfOwnerMatch Order allow,deny Allow from all </Directory> ErrorLog ${APACHE_LOG_DIR}/error.log # Possible values include: debug, info, notice, warn, error, crit, # alert, emerg. LogLevel warn CustomLog ${APACHE_LOG_DIR}/access.log combined Alias /doc/ "/usr/share/doc/" <Directory "/usr/share/doc/"> Options Indexes MultiViews FollowSymLinks AllowOverride None Order deny,allow Deny from all Allow from 127.0.0.0/255.0.0.0 ::1/128 </Directory> </VirtualHost> <virtualhost *:443> SSLEngine on SSLCertificateFile /etc/apache2/ssl/server.crt SSLCertificateKeyFile /etc/apache2/ssl/server.key ServerAdmin webmaster@localhost <Directory /> Options FollowSymLinks AllowOverride None </Directory> <Directory /var/www/> #<Directory /home/magento/site/> Options Indexes FollowSymLinks MultiViews AllowOverride None Order allow,deny allow from all </Directory> </virtualhost> I also have in sites-availabe a file setup for my site url, www.mysite.com so in /etc/apache2/sites-available/mysite.com <VirtualHost *:80> ServerName mysite.com DocumentRoot /home/magento/mysite.com <Directory /> Options FollowSymLinks AllowOverride All </Directory> <Directory /home/magento/mysite.com/ > Options Indexes FollowSymLinks MultiViews AllowOverride All Order allow,deny allow from all </Directory> ErrorLog /home/magento/logs/apache.log # Possible values include: debug, info, notice, warn, error, crit, # alert, emerg. LogLevel warn </VirtualHost> <VirtualHost *:443> ServerName mysite.com DocumentRoot /home/magento/mysite.com <Directory /> Options FollowSymLinks AllowOverride All </Directory> <Directory /home/magento/mysite.com/ > Options Indexes FollowSymLinks MultiViews AllowOverride All Order allow,deny allow from all </Directory> ErrorLog /home/magento/logs/apache.log # Possible values include: debug, info, notice, warn, error, crit, # alert, emerg. LogLevel warn </VirtualHost> Thanks for any help getting this setup! As is probably obvious from this post I am pretty lost at this point.

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• How to right-justify icon in a JLabel?

  - by geoffreyzheng

  For a JLabel with icon, if you setHorizontalTextPosition(SwingConstants.LEADING), the icon is painted right after text, no matter how wide the label is. This is particularly bad for a list, as the icons would be all over the place depending on how long the text is for each item. I traced the code and it seems to be that in SwingUtilities#layoutCompoundLabelImpl, text width is simply set to SwingUtilities2.stringWidth(c, fm, text), and icon x is set to follow text without considering label width. Here is the simplest case: import java.awt.*; import javax.swing.*; public class TestJLabelIcon { public static void main(String args[]) { EventQueue.invokeLater(new Runnable() { public void run() { JLabel c = new JLabel("abc"); c.setHorizontalTextPosition(SwingConstants.LEADING); c.setHorizontalAlignment(SwingConstants.LEADING); c.setIcon(UIManager.getIcon("FileChooser.detailsViewIcon")); c.setBorder(BorderFactory.createLineBorder(Color.RED)); JFrame frame = new JFrame(); frame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE ); frame.getContentPane().add(c); frame.pack(); frame.setLocationRelativeTo(null); frame.setVisible(true); } }); } } You can see that label always fills the frame but icon stays put. You'll get the mirror problem if you set both arguments to TRAILING. I know I can override the UI, or use a JPanel, etc. I just wonder if I'm missing something simple in JLabel. If not, it seems like a Java bug. FYI this is jdk1.6.0_06 on Windows XP.

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• Fully-loaded UIViewController losing all it's data after adding to scroll view

  - by clozach

  Summary I'm repurposing Apple's Page Control project. In loadScrollViewWithPage:, the view controllers that I'm adding to the scroll view appear on screen without their initialized values, as if displayed directly from the nib. Specifics Here's the code that appears to be working when I step through it: CBFullScreenViewController *controller = [viewControllers objectAtIndex:page]; if ((NSNull *)controller == [NSNull null]) { controller = [[CBFullScreenViewController alloc] init]; // Populate the view from the corresponding CBImage object CBImage *imageObject = [imageArray objectAtIndex:page]; BOOL bookmarked = [imageObject.bookmarked boolValue]; controller.bookmarkButton.highlighted = bookmarked; NSString *subtitle = imageObject.subtitle; controller.closedSubtitleLabel.text = subtitle; // <-- snip...more initialization --> // controller.delegate = self; [viewControllers replaceObjectAtIndex:page withObject:controller]; [controller release]; } // add the controller's view to the scroll view if (nil == controller.view.superview) { CGRect frame = scrollView.frame; frame.origin.x = frame.size.width * page; frame.origin.y = 0; controller.view.frame = frame; [scrollView addSubview:controller.view];//<< controller and subviews } // all have non-null, seemingly // valid values at this point Here's the init method in CBFullScreenViewController: - (id)init { if ((self = [super initWithNibName:@"CBFullScreenViewController" bundle:nil])) { self.cover = [[UIImageView alloc] init]; self.homeButton = [[UIButton alloc] init]; self.tabView = [[UIButton alloc] init]; self.closedSubtitleLabel = [[UILabel alloc] init]; self.openSubtitleLabel = [[UILabel alloc] init]; // <-- snip...more initialization --> // } return self; } While troubleshooting this for the last 2 hours has helped me track down some unrelated memory leaks, I can't for the life of me figure out what's happening to the values I'm putting into my view! Oh, it's probably worth mentioning that I've got @synthesize for each of my outlets, and they're all hooked up in IB. Screenshot here.

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• Problem with Flash...help

  - by aarontb

  Hey Guys...need help. Working on a project and get this error on the Output Log TypeError: Error #1009: Cannot access a property or method of a null object reference. at FlashSite_fla::MainTimeline/frame16() Here's every frame that is on, begins, or crosses frame 16 Layer Name: Top Menu (4 Button named Home_btn, Works_btn, Tech_btn, Contact_btn) Code attached to frame: stop(); Home_btn.addEventListener(MouseEvent.CLICK, home); function home(event:MouseEvent):void { gotoAndStop(16); } Works_btn.addEventListener(MouseEvent.CLICK, works); function works(event:MouseEvent):void { gotoAndStop(17); } Tech_btn.addEventListener(MouseEvent.CLICK, tech); function tech(event:MouseEvent):void { gotoAndStop(18); } Contacts_btn.addEventListener(MouseEvent.CLICK, contact); function contact(event:MouseEvent):void { gotoAndStop(19); } Layer Name: Investment Opp (button named Invest_btn) Code attached to frame: Invest_btn.addEventListener(MouseEvent.CLICK, invest); function invest(event:MouseEvent):void { var link:URLRequest = new URLRequest('#'); navigateToURL(link); } Layer Name: MfgOpp (Button named Mfg_btn) Code attached to frame: Mfg_btn.addEventListener(MouseEvent.CLICK, mfg); function mfg(event:MouseEvent):void { var link:URLRequest = new URLRequest('#'); navigateToURL(link); } Layer Name: MarketResearch (button name Own_btn) Code attached to frame: Own_btn.addEventListener(MouseEvent.CLICK, own); function own(event:MouseEvent):void { var link:URLRequest = new URLRequest('#'); navigateToURL(link); } Layer Name: ActionScript Code attached to frame: import flash.events.MouseEvent; What am I doing wrong?!?!

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• iPhone: TableView inside UIScrollview, show vaccillating scrollbars around

  - by karim

  Hi, I have added some table and other vies in a scrollview. scrolling in tables are working fine. But in the parent scrollview, when scrolling, a vacillating vertical scrollbars are shown, sometimes it even come to the middle of the screen. sometime show at the left side of the screen. and not limited to the vertical scrollbar region. When I set tje showsVerticalScrollIndicator = NO, it is not shown. But do you know why the scrollbar is moving around. DashboardView is a subclass of UIScrollView. dashboard=[[DashboardView alloc] initWithFrame:fullScreenRect]; dashboard.contentSize = CGSizeMake(320,700); // must do! dashboard.showsVerticalScrollIndicator = YES; dashboard.bounces = YES; self.view = dashboard; @implementation DashboardView (id)initWithFrame:(CGRect)frame { if (self = [super initWithFrame:frame]) { // Initialization code } return self; } (void)drawRect:(CGRect)rect { // Drawing code } (void) layoutSubviews{ NSArray *views = self.subviews; [UIView beginAnimations:@"CollapseExpand" context:nil]; [UIView setAnimationDuration:0.5]; [UIView setAnimationBeginsFromCurrentState:YES]; [UIView setAnimationCurve:UIViewAnimationCurveEaseIn]; UIView *view = [views objectAtIndex: 0]; CGRect rect = view.frame; for (int i = 1; i < [views count]; i++ ) { view = [views objectAtIndex:i]; view.frame = CGRectMake(rect.origin.x, rect.origin.y + rect.size.height, view.frame.size.width, view.frame.size.height); rect = view.frame; } [UIView commitAnimations]; }

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• Scrolling screen upward to expose TextView above keyboard

  - by Matt Winters

  I think I'm missing something obvious and would appreciate an answer. I have a view with a 2-section grouped tableView, each section having one row and a textView, the heights of the rows 335 and 140. This allows for a box with nicely rounded corners to type text into when the keyboard appears (140 height section) and when the keyboard is dismissed, a nice box to read more text (notes); most of the time, use is without the keyboard. I also added a toolbar at the bottom of the screen to scroll up above the keyboard. A button on the toolbar dismisses the keyboard. This last part works fine with the keyboard going up and down using a notification and the following code in a keyboardWillShow method: [UIView beginAnimations:@"showKeyboardAnimation" context:nil]; [UIView setAnimationDuration:0.50]; self.view.frame = CGRectMake(self.view.frame.origin.x, self.view.frame.origin.y, self.view.frame.size.width, self.view.frame.size.height - 216); [UIView commitAnimations]; But with the above code, the 2 sections of the tableView remain unscrolled, only the toolbar and the keyboard move. With the following code (found both in previous posts), both the toolbar and the tableView sections move. [UIView beginAnimations:nil context:NULL]; [UIView setAnimationDuration:0.50]; CGRect rect = self.view.frame; rect.origin.y -= 216; self.view.frame = rect; [UIView commitAnimations]; Now I know that I have to tweak the numbers to get the everything as I want it but my first question is what is substantively different between the 2 sets of code that the sections move in the 2nd but not in the 1st? The toolbar also moves with the 2nd code. The second question is, am I going to be able to scroll the smaller height section from off the screen to above the keyboard while at the same time moving the toolbar up just 216? Thanks

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• How to build a sequence in the method calls of a fluent interface

  - by silverfighter

  Hi I would like to build a fluent interface for creating am object some sort of factory or builder. I understand that I have to "return this" in order to make the methods chainable. public class CarBuilder { public CarBuilder() { car = new Car(); } private Car car; public CarBuilder AddEngine(IEngineBuilder engine) { car.Engine = engine.Engine(); return this; } public CarBuilder AddWheels(IWheelsBuilder wheels) { car.Wheels = wheels.Wheels(); return this; } public CarBuilder AddFrame(IFrameBuilder frame) { car.Frame = frame.Frame(); return this; } public Car BuildCar() { return car; } } with this I could build a car like that: Car c = builder.AddFrame(fBuilder).AddWheels(wBuilder).AddEngine(eBuilder).BuildCar(); But what I need is a special sequence or workflow: I can only build the wheels on top of the frame and when the wheels exist then I'll be able to build up the engine. So instead of offering every method of the car builder I want to be able to add only the frame to the builder and then only the wheels to the frame and then the engine on top of that... And how would it be or what would be a good implementation if the EngineBuilder itself has a fluent api like eBuilder.Cylinders(12).WithPistons().... Would it be possible to have something like this Car c = builder.AddFrame(fBuilder).AddWheels(wBuilder).AddEngine(x=>x.WithCylinders(12).WithPistons()).BuildCar(); So in sum how to structure the flow of the fluent interface and how to nest fluent Interfaces?

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• sizer.replace() paints "over" old sizercontent

  - by elbenfreund

  hi. I am rather new to wx/python so please excuse if this is stupid or ill described. I am substituting a nested sizer with a new one as shown in the snippet below. after some tinkering everything seems to work out but the re-drawing of the parent-sizer. the content of the old nested sizer remains and gets "painted" over with the new sizer content despite my sizer.Layout() system setup: - python 2.5.5.2 and 2.6.4 - wxpython 2.8 -- coding: utf8 -- import wx class Frame(wx.Frame): def init(self): wx.Frame.init(self, None, wx.ID_ANY, title='test') class Test(wx.App): def OnInit(self): frame = Frame() self.panel = wx.Panel(frame) self.panel.SetBackgroundColour('red') self.sizer = wx.BoxSizer(wx.VERTICAL) button = wx.Button(self.panel, wx.ID_ANY, 'TEST') self.hsizer = wx.BoxSizer(wx.HORIZONTAL) self.hsizer.Add(wx.StaticText(self.panel, wx.ID_ANY, 'nacknack')) self.sizer.Add(button) self.Bind(wx.EVT_BUTTON, self.on_test_button, button) self.text = wx.StaticText(self.panel, wx.ID_ANY, 'FOOO') self.sizer.Add(self.text) self.sizer.Add(self.hsizer) self.panel.SetSizer(self.sizer) frame.Show() return True def on_test_button(self, evt): tmpsizer = wx.BoxSizer(wx.VERTICAL) tmpsizer.Add(self.makesizer()) tmpitem = tmpsizer.GetChildren()[0] self.sizer.Replace(2, tmpitem) self.sizer.Layout() def makesizer(self): testsizer = wx.BoxSizer(wx.HORIZONTAL) testsizer.Add(wx.StaticText(self.panel, wx.ID_ANY, 'testsizer')) return testsizer if __name__ == '__main__': app = Test() app.MainLoop()

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• How to place images on top of each other in java

  - by Haxed

  Hi, I have a background image of a road, which I have displayed on a JFrame using an ImageIcon. I want to put a car on top of that background image at a certain (x,y) location. I tried using another ImageIcon and the background does not appear when I run the program , however the car does. import javax.swing.ImageIcon; import javax.swing.JFrame; import javax.swing.JLabel; public class Gui extends JFrame { private ImageIcon northcar = new ImageIcon("src/north.gif"); private ImageIcon usIcon = new ImageIcon("src/trafficLight.jpg"); public Gui() { add(new JLabel(usIcon)); // background image does not appear after the i added the northcar label add(new JLabel(northcar)); // this picture can be seen } public static void main(String[] args) { Gui frame = new Gui(); frame.setTitle("TestImageIcon"); frame.setLocationRelativeTo(null); // Center the frame frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setBounds(0, 0, 650, 650); frame.setVisible(true); } } I heard about using a canvas but have no clue. Any ideas ? Many Thanks

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• How to print a page when a JButton is pressed in java swing using PrinterJob?

  - by Prayag Upd

  I tried the following code AWT but at runtime shows multiple print dialogs repeatedly.... package printerjob; import java.awt.BasicStroke; import java.awt.Frame; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.event.WindowAdapter; import java.awt.print.PageFormat; import java.awt.print.Printable; import java.awt.print.PrinterException; import java.awt.print.PrinterJob; /** * * @author pragX */ public class FramePrinterJob extends Frame implements Printable{ public void start(){ add(button); } @Override public void paint(Graphics graphics){ PrinterJob printerJob=PrinterJob.getPrinterJob(); printerJob.setPrintable(this); if(printerJob.printDialog()){ try{ printerJob.print(); }catch(PrinterException printerException){ //printerException.printStackTrace(); System.out.println("Error Printing." + printerException); } } } public int print(Graphics graphics, PageFormat pageFormat, int pageIndex) throws PrinterException { //throw new UnsupportedOperationException("Not supported yet."); if(pageIndex>=1){ return Printable.NO_SUCH_PAGE; } graphics.translate((int) pageFormat.getImageableX(), (int)pageFormat.getImageableY()); Graphics2D graphics2D=(Graphics2D)graphics; graphics2D.setStroke(new BasicStroke(4f)); graphics2D.drawLine(20, 20, 20, 120); graphics2D.drawLine(40, 20, 40, 120); graphics2D.drawLine(20, 70, 40, 70); graphics2D.drawLine(60, 70, 60, 120); graphics2D.drawLine(60, 40, 60, 45); return Printable.PAGE_EXISTS; } public static void main(String args[]){ Frame frame=new FramePrinterJob(); frame.addWindowListener(new WindowAdapter() { public void windowClosing(){System.exit(0);}}); frame.setSize(300,400); frame.setVisible(true); } }

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• Jtable live updating problem

  - by Fishinastorm

  Hi all, I'm trying to display a jtable in a pop up Jframe and am running into some problems. What i'am trying to do is as follows: catch a button action event in the main frame and display a pop up frame with a jtable populated with some data. The problem i have is that the jtable is populated with metadata i receive from a website and if i'm receiving many records, then the jtable is not displayed until all the records(metadata) is received from the website. I would like to change it such that as soon as the button event is detected in the main frame, I display the pop up frame along with the jtable and insert/update rows "as and when i receive the data from the website". In another words, i want to display the table and have the records appearing one at a time rather than displaying the jtable only after i receive all records.Below is how i'm trying to do it (but in vain :( ): ......... //add the table to the popup frame when application is started, but don't display the frame `until button action is //detected` extraInfoFrame.add(tblMetadata); extraInfoFrame.setVisible(false); //handle code for button press; display the popup private void butMetadataActionPerformed(java.awt.event.ActionEvent evt) { extraInfoFrame.pack(); extraInfoFrame.toFront(); //frame.setSize(350, 250); extraInfoFrame.setVisible(true); //retrieve rows data for the table for(int i=0;i<len;i++){ Object[] data=new Object[4];data=getMetadata(); //get model and insert row ((javax.swing.table.DefaultTableModel)tblMetadata.getModel()).insertRow(i,data); //tried something to notify the view abt change in table data ((javax.swing.table.DefaultTableModel)tblMetadata.getModel()).fireTableRowsInserted(0, 0); tblMetadata.revalidate(); tblMetadata.repaint(); } } Have been racking my head to try and figure something out. A sample example would be greatly appreciated.

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• Create JTable in a JPanel and add row

  - by DK64

  On my program I've dinamically created a JFrame that contains a JPanel called jp. jp also contains a JTable that I would like to fill with some rows. case KeyEvent.VK_R: JFrame frame = new JFrame("Snake v2.0 - Rankings"); JPanel jp = new JPanel(); jp.setPreferredSize(new Dimension(300,300)); JTable table = new JTable(); JScrollPane tableContainer = new JScrollPane(table); jp.add(tableContainer, BorderLayout.CENTER); DefaultTableModel tm = (DefaultTableModel) table.getModel(); tm.addRow(new Object[] {"#","Player","Score","Date"}); frame.setDefaultCloseOperation(JFrame.HIDE_ON_CLOSE); frame.setLocationRelativeTo(null); frame.setResizable(false); frame.getContentPane().add(jp); frame.pack(); frame.setVisible(true); break; This is my code. When I press R on the keyboard, the JFrame with that JPanel inside appears but the table doesnt (picture). What could I do?

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• Am I doing AS3 reference cleanup correctly?

  - by Ólafur Waage

  In one frame of my fla file (let's call it frame 2), I load a few xml files, then send that data into a class that is initialized in that frame, this class creates a few timers and listeners. Then when this class is done doing it's work. I call a dispatchEvent and move to frame 3. This frame does some things as well, it's initialized and creates a few event listeners and timers. When it's done, I move to frame 2 again. This is supposed to repeat as often as I need so I need to clean up the references correctly and I'm wondering if I'm doing it correctly. For sprites I do this. world.removeChild(Background); // world is the parent stage Background = null; For instances of other classes I do this. Players[i].cleanUp(world); // do any cleanup within the instanced class world.removeChild(PlayersSelect[i]); For event listeners I do this. if(Background != null) { Background.removeEventListener(MouseEvent.CLICK, deSelectPlayer); } For timers I do this. if(Timeout != null) { Timeout.stop(); Timeout.removeEventListener(TimerEvent.TIMER, queueHandler); Timeout.removeEventListener(TimerEvent.TIMER_COMPLETE, queueCompleted); Timeout = null; } And for library images I do this if(_libImage!= null) { s.removeChild(Images._libImage); // s is the stage _libImage= null; } And for the class itself in the main timeline, I do this Frame2.removeEventListener("Done", IAmDone); Frame2.cleanUp(); // the cleanup() does all the stuff above Frame2= null; Even if I do all this, when I get to frame 2 for the 2nd time, it runs for 1-2 seconds and then I get a lot of null reference errors because the cleanup function is called prematurely. Am I doing the cleanup correctly? What can cause events to fire prematurely?

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• How to make BoxLayout vertical but children flow top-aligned?

  - by user291701

  I'm trying to get get a vertical, top-aligned layout to work. This is what I have: JPanel pane = new JPanel(); pane.setLayout(new BoxLayout(pane, BoxLayout.Y_AXIS)); MyImagePanel panelImage = new MyImagePanel(); panelImage.setSize(400, 400); pane.add(new JComboBox()); pane.add(panelImage); pane.add(new JButton("1")); pane.add(new JButton("2")); pane.add(new JButton("3")); JFrame frame = new JFrame("Title"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setSize(800, 600); frame.add(pane); frame.pack(); frame.setVisible(true); All the controls appear, but it looks like padding is being applied at run time between their tops and bottoms so they're somewhat vertically centered. This is what I'm going for: ----------------------------------------------------- | ComboBox | | ------------ | | | | | Image | | | | | ------------ | | Button 1 | Any additional space fills the right | ------------ | | Button 2 | | ------------ | | Button 3 | | ------------ | | | | Any additional space fills the bottom | | | ----------------------------------------------------- How do I get BoxLayout to do that? Thanks ------------------------- Update ------------------------- Was able to use this: Box vertical = Box.createVerticalBox(); frame.add(vertical, BorderLayout.NORTH); vertical.add(new JComboBox()); vertical.add(new JButton("1")); ... to get what I wanted.

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• Setup for games animation: How do I know JFrame is finished setting itself up?

  - by Jokkel

  I'm using javax.swing.JFrame to draw game animations using double buffer strategy. First, I set up the frame. JFrame frame = new JFrame(); frame.setVisible(true); Now, I draw an object (let it be a circle, doesn't matter) like this. frame.createBufferStrategy(2); bufferStrategy = frame.getBufferStrategy(); Graphics g = bufferStrategy.getDrawGraphics(); circle.draw(g); bufferStrategy.show(); The problem is that the frame is not always fully set-up when the drawing takes place. Seems like JFrame needs up to three steps in resizing itself, until it reaches it's final size. That makes the drawing slide out of frame or hinders it to appear completely from time to time. I already managed to delay things using SwingUtilities.invokeLater(). While this improved the result, there are still times when the drawing slides away / looks prematurely draw. Any idea / strategy? Thanks in advance. EDIT: Ok thanks so far. I didn't mention that I write a little Pong game in the first place. Sorry for the confusion What I actually looked for was the right setup for accelerated game animations done in Java. While reading through the suggestions I found my question answered (though indirectly) here and this example made things clear for me. A resume for this might be that for animating game graphics in Java, the first step is to get rid of the GUI logic overhead.

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• AS3 colorTransform over multiple frames?

  - by user359519

  (Flash Professional, AS3) I'm working on a custom avatar system where you can select various festures and colors. For example, I have 10 hairstyles, and a colorPicker to change the color. mc_myAvatar has 10 frames. Each frame has a movieclip of a different hairstyle (HairStyle1, HairStyle2, etc.) Here's my code: var hairColor:ColorTransform; hairColor = mc_myAvatar.hair.colorLayer.transform.colorTransform; hairColor.color = 0xCCCC00; mc_myAvatar.hair.colorLayer.transform.colorTransform = hairColor; This correctly changes the initial color. I have a "nextHair" button to advance mc_myAvatar.hair to the next frame. When I click the button, I get an error message saying that I have a null object reference. I added a trace, and mc_myAvatar.hair.colorLayer is null on frame 2. Why??? I've clearly named HairStyle2 as "colorLayer" in frame 2. I think the problem is related to me using the same name for different classes/movieclips, but I don't know how to fix the problem... I added a square movieclip below my hairStyle movieclips, named the square "colorLevel", and deleted the name from my hairStyle clips. When I click the next button, the square correctly maintains the color from frame to frame. However, having a square doesn't do me much good. :( I tried converting the hairStyle layer to a mask. Doing this, however, results in yet another "null object" error - mc_myAvatar.hair.colorLayer is null after frame 1. I even tried "spanning" my colorLevel across all frames (no keyframes), thinking that this would give me just one movieclip to work with. No luck. Same error! What's going on, here? Why am I getting these null objects, when they are clearly defined in my movieclip? I'm also open to suggestions on a better way to do multiple frames and colors.

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• Popovercontroller doesn't display full

  - by user2959234

  I have an UIPopovercontroller in with an content that generate from an viewcontroller. popOverController = [[UIPopoverController alloc]initWithPopUp:emLightPopUp]; popOverController.delegate = self; // Get device position. CGRect position = {parentButton.frame.origin,emLightPopUp.popUpView.frame.size}; CGSize popUpViewFrameSize = emLightPopUp.popUpView.frame.size; Link screenshot: http://i.stack.imgur.com/AxqoG.png The issue is that when I change the position of select devices (touched button) upwards, the displayed popup will be resized like the screenshot. I already try to set content size inside the subclass of uipopover but it still doesn't work: self.popoverContentSize = emLightPopUp.popUpView.frame.size; EDIT: I solved this problems by calculate the position that display the popup and scroll the scrollview inside into an upper position. Check out this code: -(void)moveDeviceOutMiddleScreen:(id)deviceButton { UIButton* button = (UIButton*)deviceButton; CGFloat yPositionRange = button.frame.origin.y - self.floorZoomScrollView.contentOffset.y; int middle_top_y = 70; int middle_bottom_y = 166; if (yPositionRange > middle_top_y && yPositionRange < middle_bottom_y) { CGRect newRect = CGRectMake(self.floorZoomScrollView.contentOffset.x, self.floorZoomScrollView.contentOffset.y +yPositionRange*0.6, self.floorZoomScrollView.frame.size.width, self.floorZoomScrollView.frame.size.height); [self.floorZoomScrollView scrollRectToVisible:newRect animated:NO]; } } Thanks for your responses.

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• Use DivX settings to encode to mp4 with ffmpeg

  - by sjngm

  I'm used to use VirtualDub to encode a video to AVI container with DivX-codec (and MP3 for audio). Now I'm planning to use ffmpeg to encode videos to MP4 container with h264-codec. What I've figured out is that I need to use libx264 and one of those presets to make anything work. However, I'm amazed about the video bitrate ffmpeg uses for encoding. What I currently have is this little batch file: @ECHO OFF SETLOCAL SET IN=source.avs SET FFMPEG_PATH=C:\Program Files (x86)\ffmpeg SET PRESET=-fpre "%FFMPEG_PATH%\presets\libx264-lossless_slow.ffpreset" SET AUDIO=-acodec libmp3lame -ab 128000 SET VIDEO=-vcodec libx264 -vb 1978000 "%FFMPEG_PATH%\ffmpeg.exe" -i %IN% %AUDIO% %VIDEO% %PRESET% test.mp4 ENDLOCAL With this I tell ffmpeg to use 1978k as the bitrate, but ffmpeg uses 15000k+! I tried other presets, but they don't use my specified bitrate. Here are the presets I have: libx264-baseline.ffpreset libx264-ipod320.ffpreset libx264-ipod640.ffpreset libx264-lossless_fast.ffpreset libx264-lossless_max.ffpreset libx264-lossless_medium.ffpreset libx264-lossless_slow.ffpreset libx264-lossless_slower.ffpreset libx264-lossless_ultrafast.ffpreset ffmpeg version: FFmpeg git-N-29181-ga304071 libavutil 50. 40. 1 / 50. 40. 1 libavcodec 52.120. 0 / 52.120. 0 libavformat 52.108. 0 / 52.108. 0 libavdevice 52. 4. 0 / 52. 4. 0 libavfilter 1. 79. 0 / 1. 79. 0 libswscale 0. 13. 0 / 0. 13. 0 Note that I don't use the latest version as it has problems with spaces in filenames. Here's what seems to be the full parameter list DivX 6.9.2 uses: -bvnn 1978000 -vbv 218691200,100663296,100663296 -dir "C:\Users\sjngm\AppData\Roaming\DivX\DivX Codec" -w -b 1 -use_presets=1 -preset=10 -windowed_fullsearch=2 -thread_delay=1 What command line parameters would that be for ffmpeg? EDIT: Going with slhck's suggestion I tried a new 32-bit version. I have no idea if that is 0.9 or newer, I can't find that info. ffmpeg version N-36890-g67f5650 libavutil 51. 34.100 / 51. 34.100 libavcodec 53. 56.105 / 53. 56.105 libavformat 53. 30.100 / 53. 30.100 libavdevice 53. 4.100 / 53. 4.100 libavfilter 2. 59.100 / 2. 59.100 libswscale 2. 1.100 / 2. 1.100 libswresample 0. 6.100 / 0. 6.100 libpostproc 51. 2.100 / 51. 2.100 I reworked my batch file to look like this (interestingly enough I can't find parameter -vprofile in the documentation): @ECHO OFF SETLOCAL SET IN=VTS_01_1.avs SET FFMPEG_PATH=C:\Program Files (x86)\ffmpeg SET PRESET=-vprofile high -preset veryslow SET AUDIO=-acodec libmp3lame -ab 128000 SET VIDEO=-vcodec libx264 -vb 1978000 "%FFMPEG_PATH%\ffmpeg.exe" -i %IN% %AUDIO% %PRESET% %VIDEO% test.mp4 ENDLOCAL I see that it now uses the bitrate properly (thanks to LongNeckbeard for pointing out that the lossless-stuff ignores the bitrate!). Just in case you wonder how I came up with the 1978000, I'm using this formula which I found valid for DivX-files (I'm guessing the bitrate won't change that much for h264): width * height * 25 * 0.22 / 1000 I'm not sure if the 0.22 correlates with the CRF somehow. Overall I forgot to say the I will use a two-pass scenario, which is why I don't use the CRF here. I will try to read more about this. Currently I'm just trying to get something running that shows me that I'm doing something right (ffmpeg isn't the easiest tool to understand ;)). C:\Program Files (x86)\ffmpeg\ffmpeg.exe" -i VTS_01_1.avs -acodec libmp3lame -ab 128000 -vcodec libx264 -vb 1978000 -vprofile high -preset veryslow test.mp4 The output is now: ffmpeg version N-36890-g67f5650 Copyright (c) 2000-2012 the FFmpeg developers built on Jan 16 2012 21:57:13 with gcc 4.6.2 configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-runtime-cpudetect --enable-avisynth --enable-bzlib --enable-frei0r --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-libopenjpeg --enable-librtmp --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib libavutil 51. 34.100 / 51. 34.100 libavcodec 53. 56.105 / 53. 56.105 libavformat 53. 30.100 / 53. 30.100 libavdevice 53. 4.100 / 53. 4.100 libavfilter 2. 59.100 / 2. 59.100 libswscale 2. 1.100 / 2. 1.100 libswresample 0. 6.100 / 0. 6.100 libpostproc 51. 2.100 / 51. 2.100 Input #0, avs, from 'VTS_01_1.avs': Duration: 00:58:46.12, start: 0.000000, bitrate: 0 kb/s Stream #0:0: Video: rawvideo (YV12 / 0x32315659), yuv420p, 576x448, 77414 kb/s, 25 tbr, 25 tbn, 25 tbc Stream #0:1: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 48000 Hz, 2 channels, s16, 1536 kb/s File 'test.mp4' already exists. Overwrite ? [y/N] y w:576 h:448 pixfmt:yuv420p tb:1/1000000 sar:0/1 sws_param: [libx264 @ 05A2C400] using cpu capabilities: MMX2 SSE2Fast FastShuffle SSEMisalign LZCNT [libx264 @ 05A2C400] profile High, level 3.1 [libx264 @ 05A2C400] 264 - core 120 r2120 0c7dab9 - H.264/MPEG-4 AVC codec - Copyleft 2003-2011 - http://www.videolan.org/x264.html - options: cabac=1 ref=16 deblock=1:0:0 analyse=0x3:0x133 me=umh subme=10 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=24 chroma_me=1 trellis=2 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=3 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=8 b_pyramid=2 b_adapt=2 b_bias=0 direct=3 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=60 rc=abr mbtree=1 bitrate=1978 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00 Output #0, mp4, to 'test.mp4': Metadata: encoder : Lavf53.30.100 Stream #0:0: Video: h264 (![0][0][0] / 0x0021), yuv420p, 576x448, q=-1--1, 1978 kb/s, 25 tbn, 25 tbc Stream #0:1: Audio: mp3 (i[0][0][0] / 0x0069), 48000 Hz, 2 channels, s16, 128 kb/s Stream mapping: Stream #0:0 -> #0:0 (rawvideo -> libx264) Stream #0:1 -> #0:1 (pcm_s16le -> libmp3lame) Press [q] to stop, [?] for help frame= 0 fps= 0 q=0.0 size= 0kB time=00:00:00.00 bitrate= 0.0kbits/s frame= 0 fps= 0 q=0.0 size= 0kB time=00:00:00.00 bitrate= 0.0kbits/s frame= 0 fps= 0 q=0.0 size= 0kB time=00:00:00.00 bitrate= 0.0kbits/s frame= 3 fps= 1 q=22.0 size= 39kB time=00:00:00.04 bitrate=8063.8kbits/ frame= 8 fps= 2 q=22.0 size= 82kB time=00:00:00.24 bitrate=2801.3kbits/ frame= 13 fps= 3 q=23.0 size= 120kB time=00:00:00.44 bitrate=2229.5kbits/ frame= 16 fps= 4 q=23.0 size= 147kB time=00:00:00.56 bitrate=2156.7kbits/ frame= 20 fps= 4 q=22.0 size= 175kB time=00:00:00.72 bitrate=1987.4kbits/ : video:4387kB audio:273kB global headers:0kB muxing overhead 0.260038% [libx264 @ 05A2C400] frame I:2 Avg QP:19.53 size: 29850 [libx264 @ 05A2C400] frame P:76 Avg QP:22.24 size: 19541 [libx264 @ 05A2C400] frame B:359 Avg QP:25.93 size: 8210 [libx264 @ 05A2C400] consecutive B-frames: 0.5% 0.5% 0.0% 8.2% 17.2% 52.2% 16.0% 5.5% 0.0% [libx264 @ 05A2C400] mb I I16..4: 5.4% 75.3% 19.3% [libx264 @ 05A2C400] mb P I16..4: 1.3% 16.5% 2.2% P16..4: 36.3% 28.6% 12.7% 1.8% 0.2% skip: 0.4% [libx264 @ 05A2C400] mb B I16..4: 0.4% 3.8% 0.3% B16..8: 40.0% 18.4% 4.7% direct:18.5% skip:13.9% L0:45.4% L1:38.1% BI:16.5% [libx264 @ 05A2C400] final ratefactor: 20.35 [libx264 @ 05A2C400] 8x8 transform intra:83.1% inter:68.5% [libx264 @ 05A2C400] direct mvs spatial:99.2% temporal:0.8% [libx264 @ 05A2C400] coded y,uvDC,uvAC intra: 64.9% 83.4% 49.2% inter: 49.0% 50.4% 4.4% [libx264 @ 05A2C400] i16 v,h,dc,p: 25% 22% 27% 26% [libx264 @ 05A2C400] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 10% 7% 23% 9% 10% 10% 10%10% 13% [libx264 @ 05A2C400] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 12% 11% 13% 9% 12% 11% 10% 9% 12% [libx264 @ 05A2C400] i8c dc,h,v,p: 42% 28% 16% 14% [libx264 @ 05A2C400] Weighted P-Frames: Y:18.4% UV:7.9% [libx264 @ 05A2C400] ref P L0: 29.1% 11.3% 15.7% 7.3% 6.9% 4.9% 5.1% 3.4%3.9% 2.7% 2.8% 1.8% 1.7% 1.2% 1.4% 0.9% [libx264 @ 05A2C400] ref B L0: 68.8% 11.4% 5.5% 2.9% 2.3% 1.9% 1.5% 1.1%1.1% 1.0% 0.9% 0.7% 0.5% 0.3% 0.1% [libx264 @ 05A2C400] ref B L1: 91.9% 8.1% [libx264 @ 05A2C400] kb/s:2055.88 As far as I'm concerned it doesn't look that bad to me.

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• How to open new view (call an activity) from options menu defined in XML? (android)

  - by Portablejim

  I cant seem to open a new view from an options menu item. The program keeps crashing as it applies the intent and listener to the item. I am just beginning, so please be nice. The current view is mnfsms, and the view I am trying to open is mnfsms_settings. I am developing for 1.5. Could someone please help me get the menu working. The menu (called options_menu.xml): <menu xmlns:android="http://schemas.android.com/apk/res/android"> <item android:id="@+id/settings_button" android:title="Settings" android:icon="@android:drawable/ic_menu_preferences" /> <item android:id="@+id/about_button" android:title="About" android:icon="@android:drawable/ic_menu_myplaces" /> </menu> The main view (called mnfsms.java): package com.example.mnfsms; import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.view.Menu; import android.view.MenuInflater; import android.view.MenuItem; public class mnfsms extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); /* OnClickListener myocl = new View.OnClickListener() { public void onClick(View v){ Intent myi = new Intent(mnfsms.this, mnfsms_settings.class); startActivity(myi); } };*/ } public boolean onCreateOptionsMenu(Menu menu) { MenuInflater inflater = getMenuInflater(); inflater.inflate(R.menu.options_menu, menu); MenuItem mi_settings = (MenuItem)findViewById(R.id.settings_button); mi_settings.setIntent(new Intent(this, mnfsms_settings.class)); return true; } } The manifest: <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.mnfsms" android:versionCode="1" android:versionName="1.0"> <application android:icon="@drawable/icon" android:label="@string/app_name"> <activity android:name=".mnfsms" android:label="@string/main_window_name"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> <activity android:name=".mnfsms_settings" android:label="string/main_window_name"> </activity> </application> <uses-sdk android:minSdkVersion="3" /> </manifest> The stacktrace: 01-06 15:07:58.045: ERROR/AndroidRuntime(2123): Uncaught handler: thread main exiting due to uncaught exception 01-06 15:07:58.055: ERROR/AndroidRuntime(2123): java.lang.NullPointerException 01-06 15:07:58.055: ERROR/AndroidRuntime(2123): at com.example.mnfsms.mnfsms.onCreateOptionsMenu(mnfsms.java:30) 01-06 15:07:58.055: ERROR/AndroidRuntime(2123): at android.app.Activity.onCreatePanelMenu(Activity.java:2038) 01-06 15:07:58.055: ERROR/AndroidRuntime(2123): at com.android.internal.policy.impl.PhoneWindow.preparePanel(PhoneWindow.java:421) 01-06 15:07:58.055: ERROR/AndroidRuntime(2123): at com.android.internal.policy.impl.PhoneWindow.onKeyDownPanel(PhoneWindow.java:664) 01-06 15:07:58.055: ERROR/AndroidRuntime(2123): at com.android.internal.policy.impl.PhoneWindow.onKeyDown(PhoneWindow.java:1278) 01-06 15:07:58.055: ERROR/AndroidRuntime(2123): at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchKeyEvent(PhoneWindow.java:1735) 01-06 15:07:58.055: ERROR/AndroidRuntime(2123): at android.view.ViewRoot.deliverKeyEventToViewHierarchy(ViewRoot.java:2188) 01-06 15:07:58.055: ERROR/AndroidRuntime(2123): at android.view.ViewRoot.handleFinishedEvent(ViewRoot.java:2158) 01-06 15:07:58.055: ERROR/AndroidRuntime(2123): at android.view.ViewRoot.handleMessage(ViewRoot.java:1490) 01-06 15:07:58.055: ERROR/AndroidRuntime(2123): at android.os.Handler.dispatchMessage(Handler.java:99) 01-06 15:07:58.055: ERROR/AndroidRuntime(2123): at android.os.Looper.loop(Looper.java:123) 01-06 15:07:58.055: ERROR/AndroidRuntime(2123): at android.app.ActivityThread.main(ActivityThread.java:3948) 01-06 15:07:58.055: ERROR/AndroidRuntime(2123): at java.lang.reflect.Method.invokeNative(Native Method) 01-06 15:07:58.055: ERROR/AndroidRuntime(2123): at java.lang.reflect.Method.invoke(Method.java:521) 01-06 15:07:58.055: ERROR/AndroidRuntime(2123): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:782) 01-06 15:07:58.055: ERROR/AndroidRuntime(2123): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:540) 01-06 15:07:58.055: ERROR/AndroidRuntime(2123): at dalvik.system.NativeStart.main(Native Method)

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• Fail to analyze core dump with GDB when main.elf is dynamically linked (uses shared libs)

  - by dscTobi

  Hi all. I'm trying to analyze core dump, but i get following result: GNU gdb 6.6.0.20070423-cvs Copyright (C) 2006 Free Software Foundation, Inc. GDB is free software, covered by the GNU General Public License, and you are welcome to change it and/or distribute copies of it under certain conditions. Type "show copying" to see the conditions. There is absolutely no warranty for GDB. Type "show warranty" for details. This GDB was configured as "--host=mipsel-linux --target=mipsel-linux-uclibc". (gdb) file main.elf Reading symbols from /home/tobi/main.elf...Reading symbols from /home/tobi/main.dbg...done. done. (gdb) core-file /srv/tobi/core warning: .dynamic section for "/lib/libpthread.so.0" is not at the expected address (wrong library or version mismatch?) Error while mapping shared library sections: /lib/libdl.so.0: No such file or directory. Error while mapping shared library sections: /lib/librt.so.0: No such file or directory. Error while mapping shared library sections: /lib/libm.so.0: No such file or directory. Error while mapping shared library sections: /lib/libstdc++.so.6: No such file or directory. Error while mapping shared library sections: /lib/libc.so.0: No such file or directory. warning: .dynamic section for "/lib/libgcc_s.so.1" is not at the expected address (wrong library or version mismatch?) Error while mapping shared library sections: /lib/ld-uClibc.so.0: No such file or directory. Reading symbols from /lib/libpthread.so.0...done. Loaded symbols for /lib/libpthread.so.0 Symbol file not found for /lib/libdl.so.0 Symbol file not found for /lib/librt.so.0 Symbol file not found for /lib/libm.so.0 Symbol file not found for /lib/libstdc++.so.6 Symbol file not found for /lib/libc.so.0 Reading symbols from /lib/libgcc_s.so.1...done. Loaded symbols for /lib/libgcc_s.so.1 Symbol file not found for /lib/ld-uClibc.so.0 warning: Unable to find dynamic linker breakpoint function. GDB will be unable to debug shared library initializers and track explicitly loaded dynamic code. Core was generated by 'root/main.elf'. Program terminated with signal 11, Segmentation fault. #0 0x0046006c in NullPtr (parse_p=0x2ac9dc80, result_sym_p=0x13e3d6c "") at folder/my1.c:1624 1624 *ptr += 13; (gdb) bt #0 0x0046006c in NullPtr (parse_p=0x2ac9dc80, result_sym_p=0x13e3d6c "") at folder/my1.c:1624 #1 0x0047a31c in fn1 (line_ptr=0x2ac9dd18 "ccore_null_pointer", target_ptr=0x13e3d6c "", result_ptr=0x2ac9dd14) at folder/my2.c:980 #2 0x0047b9d0 in fn2 (macro_ptr=0x0, rtn_exp_ptr=0x0) at folder/my3.c:1483 /... some functions .../ #8 0x2aab7f9c in __nptl_setxid () from /lib/libpthread.so.0 Backtrace stopped: frame did not save the PC (gdb) thread apply all bt Thread 159 (process 1093): #0 0x2aac15dc in _Unwind_GetCFA () from /lib/libpthread.so.0 #1 0x2afdfde8 in ?? () warning: GDB cant find the start of the function at 0x2afdfde8. GDB is unable to find the start of the function at 0x2afdfde8 and thus cant determine the size of that functions stack frame. This means that GDB may be unable to access that stack frame, or the frames below it. This problem is most likely caused by an invalid program counter or stack pointer. However, if you think GDB should simply search farther back from 0x2afdfde8 for code which looks like the beginning of a function, you can increase the range of the search using the set heuristic-fence-post command. Backtrace stopped: previous frame inner to this frame (corrupt stack?) Thread 158 (process 1051): #0 0x2aac17bc in pthread_mutexattr_getprioceiling () from /lib/libpthread.so.0 #1 0x2aac17a0 in pthread_mutexattr_getprioceiling () from /lib/libpthread.so.0 Backtrace stopped: previous frame identical to this frame (corrupt stack?) Thread 157 (process 1057): #0 0x2aabf908 in ?? () from /lib/libpthread.so.0 #1 0x00000000 in ?? () Thread 156 (process 1090): #0 0x2aac17bc in pthread_mutexattr_getprioceiling () from /lib/libpthread.so.0 #1 0x2aac17a0 in pthread_mutexattr_getprioceiling () from /lib/libpthread.so.0 Backtrace stopped: previous frame identical to this frame (corrupt stack?) Thread 155 (process 1219): #0 0x2aabf908 in ?? () from /lib/libpthread.so.0 #1 0x00000000 in ?? () Thread 154 (process 1218): #0 0x2aabfb44 in connect () from /lib/libpthread.so.0 #1 0x00000000 in ?? () Thread 153 (process 1096): #0 0x2abc92b4 in ?? () warning: GDB cant find the start of the function at 0x2abc92b4. #1 0x2abc92b4 in ?? () warning: GDB cant find the start of the function at 0x2abc92b4. Backtrace stopped: previous frame identical to this frame (corrupt stack?) Thread 152 (process 1170): #0 0x2aabfb44 in connect () from /lib/libpthread.so.0 #1 0x00000000 in ?? () If i make main.elf statically linked everything is OK and i can see bt of all threads. Any ideas?

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• KVM work with bridge network problems

  - by isware

  I try to configure bridge network for KVM(refer to http://www.linux-kvm.org/page/Networking), and it worked for Guest OS, but I have two problems with my Fedora host OS: 1?I can not access internet on host 2?The bridge configuration lost after reboot, I need to execute "service network restart" again to bring it up I checked here(http://serverfault.com/questions/168119/kvm-network-bridge-with-public-static-ip-for-both-host-and-guests) for the first problem, it seems not working for me. Any advice is appreciated! ifconfig -a eth0 Link encap:Ethernet HWaddr 48:5B:39:ED:EB:5A inet6 addr: fe80::4a5b:39ff:feed:eb5a/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:231340 errors:0 dropped:0 overruns:0 frame:0 TX packets:413424 errors:0 dropped:0 overruns:0 carrier:1 collisions:0 txqueuelen:1000 RX bytes:15335606 (14.6 MiB) TX bytes:114755796 (109.4 MiB) Interrupt:44 lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:119307 errors:0 dropped:0 overruns:0 frame:0 TX packets:119307 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:57151264 (54.5 MiB) TX bytes:57151264 (54.5 MiB) sit0 Link encap:IPv6-in-IPv4 NOARP MTU:1480 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:0 (0.0 b) TX bytes:0 (0.0 b) sw0 Link encap:Ethernet HWaddr 48:5B:39:ED:EB:5A inet addr:192.168.1.133 Bcast:255.255.255.255 Mask:255.255.255.0 inet6 addr: fe80::4a5b:39ff:feed:eb5a/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:229584 errors:0 dropped:0 overruns:0 frame:0 TX packets:401232 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:11047463 (10.5 MiB) TX bytes:113891533 (108.6 MiB) tap0 Link encap:Ethernet HWaddr F2:86:1A:48:E2:55 inet6 addr: fe80::f086:1aff:fe48:e255/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:232 errors:0 dropped:0 overruns:0 frame:0 TX packets:2744 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:500 RX bytes:24842 (24.2 KiB) TX bytes:243899 (238.1 KiB) virbr0 Link encap:Ethernet HWaddr 9A:7C:09:6B:85:65 inet addr:192.168.122.1 Bcast:192.168.122.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:46 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:0 (0.0 b) TX bytes:5513 (5.3 KiB)

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• how to grep ip from ifconfig output

  - by Registered User

  Following is my ifconfig output eth0 Link encap:Ethernet UP BROADCAST MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B) Interrupt:28 Base address:0x2000 eth1 Link encap:Ethernet inet addr:192.168.1.2 Bcast:192.168.1.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:36497 errors:0 dropped:0 overruns:0 frame:14515 TX packets:44884 errors:1352 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:20781745 (20.7 MB) TX bytes:17776225 (17.7 MB) Interrupt:17 Base address:0xc000 lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:12 errors:0 dropped:0 overruns:0 frame:0 TX packets:12 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:720 (720.0 B) TX bytes:720 (720.0 B) virbr0 Link encap:Ethernet inet addr:192.168.122.1 Bcast:192.168.122.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:24 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:0 (0.0 B) TX bytes:4416 (4.4 KB) vmnet1 Link encap:Ethernet inet addr:192.168.185.1 Bcast:192.168.185.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:24 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B) vmnet8 Link encap:Ethernet inet addr:192.168.207.1 Bcast:192.168.207.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:25 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B) I want to do some thing grep that I see the IP corresponding to each LAN card? Is that possible? How can it be achieved?

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• avconv gets killed if mkv has subtitles

  - by Lukas Knuth

  What I'm trying to do is to take a movie (in an Matroska container), convert all audio tracks to AC3 and don't touch anything else. I'm using this line: avconv -i infile.mkv -map 0 -vcodec copy -scodec copy -acodec ac3 -ab 256k outfile.mkv This works fine, except when there are subtitles embedded. Then, after some time processing with no progress, avconv just "dies" (output shortened, these seem to be the interesting parts): [matroska,webm @ 0xf867a0] max_analyze_duration reached [matroska,webm @ 0xf867a0] Estimating duration from bitrate, this may be inaccurate ... Incompatible sample format 's16' for codec 'ac3', auto-selecting format 'flt' ... Stream #0.0(eng): Video: H264 / 0x34363248, yuv420p, 1280x536 [PAR 1:1 DAR 160:67], q=2-31, 1k tbn, 1k tbc (default) Stream #0.1(ger): Audio: ac3, 48000 Hz, 5.1, flt, 256 kb/s (default) Stream #0.2(eng): Audio: ac3, 48000 Hz, 5.1, flt, 256 kb/s Stream #0.3(ger): Subtitle: dvdsub (default) (forced) Metadata: title : forced Stream #0.4(ger): Subtitle: dvdsub Metadata: title : complete Stream mapping: Stream #0:0 -> #0:0 (copy) Stream #0:1 -> #0:1 (dca -> ac3) Stream #0:2 -> #0:2 (dca -> ac3) Stream #0:3 -> #0:3 (copy) Stream #0:4 -> #0:4 (copy) Input stream #0:2 frame changed from rate:48000 fmt:s16 ch:6 to rate:48000 fmt:flt ch:6 Input stream #0:1 frame changed from rate:48000 fmt:s16 ch:6 to rate:48000 fmt:flt ch:6 frame= 2606 fps=1303 q=-1.0 size= 3kB time=107.36 bitrate= 0.2kbits/s ... frame=96141 fps=813 q=-1.0 size= 2195806kB time=2807.04 bitrate=6408.2kbits/s frame=96251 fps=810 q=-1.0 size= 2195806kB time=2807.04 bitrate=6408.2kbits/s ... frame=97015 fps=397 q=-1.0 size= 2195806kB time=2807.04 bitrate=6408.2kbits/s Getötet ["Killed", in English] I have no idea why this happens, as there is no error-output. I'd like to just copy the subtitles over, not touch them at all. If that won't work, they can be completely dropped.

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