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• emulator crashes

  - by Dave

  I am setting up an Android environment for the first time on Eclipse. I have many years of Eclipse experience, but new to Android. This is being done on an Apple Mac Mini, running MacOSX 10.6.3. I am using the latest Eclipse Classic, version 3.5.2. I am trying to get the tiny hello world program running. When I run it, I get the following in the console window of Eclipse: [2010-06-12 13:48:08 - HelloAndroid] Automatic Target Mode: launching new emulator with compatible AVD 'Android2.2AVD' [2010-06-12 13:48:08 - HelloAndroid] Launching a new emulator with Virtual Device 'Android2.2AVD' [2010-06-12 13:48:11 - HelloAndroid] New emulator found: emulator-5554 [2010-06-12 13:48:11 - HelloAndroid] Waiting for HOME ('android.process.acore') to be launched... [2010-06-12 13:48:12 - Emulator] 2010-06-12 13:48:12.783 emulator[50495:903] Warning once: This application, or a library it uses, is using NSQuickDrawView, which has been deprecated. Apps should cease use of QuickDraw and move to Quartz. [2010-06-12 13:48:19 - HelloAndroid] emulator-5554 disconnected! Cancelling 'com.example.helloandroid.HelloAndroid activity launch'! The emulator crashes with the following info. I have followed all the instructions for running the hello world sample. Anyone have any ideas? Process: emulator [50398] Path: /Users/jeremy/android-sdk-mac_86/tools/emulator Identifier: emulator Version: ??? (???) Code Type: X86 (Native) Parent Process: eclipse [50388] Date/Time: 2010-06-12 13:28:38.595 -0400 OS Version: Mac OS X 10.6.3 (10D573) Report Version: 6 Interval Since Last Report: 363037 sec Crashes Since Last Report: 9 Per-App Crashes Since Last Report: 7 Exception Type: EXC_BAD_ACCESS (SIGSEGV) Exception Codes: KERN_INVALID_ADDRESS at 0x00000000007fd000 Crashed Thread: 4 Thread 0: Dispatch queue: com.apple.main-thread 0 emulator 0x000eed4e helper_set_cp15 + 30 Thread 1: 0 libSystem.B.dylib 0x9020bbd2 __workq_kernreturn + 10 1 libSystem.B.dylib 0x9020c168 _pthread_wqthread + 941 2 libSystem.B.dylib 0x9020bd86 start_wqthread + 30 Thread 2: Dispatch queue: com.apple.libdispatch-manager 0 libSystem.B.dylib 0x9020cb42 kevent + 10 1 libSystem.B.dylib 0x9020d25c _dispatch_mgr_invoke + 215 2 libSystem.B.dylib 0x9020c719 _dispatch_queue_invoke + 163 3 libSystem.B.dylib 0x9020c4be _dispatch_worker_thread2 + 240 4 libSystem.B.dylib 0x9020bf41 _pthread_wqthread + 390 5 libSystem.B.dylib 0x9020bd86 start_wqthread + 30 Thread 3: 0 libSystem.B.dylib 0x901e635a semaphore_timedwait_signal_trap + 10 1 libSystem.B.dylib 0x90213ea1 _pthread_cond_wait + 1066 2 libSystem.B.dylib 0x90242a28 pthread_cond_timedwait_relative_np + 47 3 com.apple.audio.CoreAudio 0x9056f965 CAGuard::WaitFor(unsigned long long) + 219 4 com.apple.audio.CoreAudio 0x90572997 CAGuard::WaitUntil(unsigned long long) + 289 5 com.apple.audio.CoreAudio 0x90570294 HP_IOThread::WorkLoop() + 1892 6 com.apple.audio.CoreAudio 0x9056fb2b HP_IOThread::ThreadEntry(HP_IOThread*) + 17 7 com.apple.audio.CoreAudio 0x9056fa42 CAPThread::Entry(CAPThread*) + 140 8 libSystem.B.dylib 0x90213a19 _pthread_start + 345 9 libSystem.B.dylib 0x9021389e thread_start + 34 Thread 4 Crashed: 0 emulator 0x00040380 audioInDeviceIOProc + 96 Thread 4 crashed with X86 Thread State (32-bit): eax: 0x00000000 ebx: 0x007fd000 ecx: 0x000001fe edx: 0x0198f3f0 edi: 0x00000200 esi: 0x01119850 ebp: 0x01119800 esp: 0xb020fad0 ss: 0x0000001f efl: 0x00010212 eip: 0x00040380 cs: 0x00000017 ds: 0x0000001f es: 0x0000001f fs: 0x0000001f gs: 0x00000037 cr2: 0x007fd000

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• Android - How to scan Access Points and select strongest signal?

  - by Donal Rafferty

  I am currently trying to write a class in Android that will Scan for access points, calculate which access point has the best signal and then connect to that access point. So the application will be able to scan on the move and attach to new access points on the go. I have the scanning and calculation of the best signal working. But when it comes to attaching to the best access point I am having trouble. It appears that enableNetwork(netid, othersTrueFalse) is the only method for attaching to an Access point but this causes problems as from my Scan Results I am not able to get the id of the access point with the strongest signal. This is my code: public void doWifiScan(){ scanTask = new TimerTask() { public void run() { handler.post(new Runnable() { public void run() { sResults = wifiManager.scan(getBaseContext()); if(sResults!=null) Log.d("TIMER", "sResults count" + sResults.size()); ScanResult scan = wifiManager.calculateBestAP(sResults); wifiManager.addNewAccessPoint(scan); } }); }}; t.schedule(scanTask, 3000, 30000); } public ScanResult calculateBestAP(List<ScanResult> sResults){ ScanResult bestSignal = null; for (ScanResult result : sResults) { if (bestSignal == null || WifiManager.compareSignalLevel(bestSignal.level, result.level) < 0) bestSignal = result; } String message = String.format("%s networks found. %s is the strongest. %s is the bsid", sResults.size(), bestSignal.SSID, bestSignal.BSSID); Log.d("sResult", message); return bestSignal; } public void addNewAccessPoint(ScanResult scanResult){ WifiConfiguration wc = new WifiConfiguration(); wc.SSID = '\"' + scanResult.SSID + '\"'; //wc.preSharedKey = "\"password\""; wc.hiddenSSID = true; wc.status = WifiConfiguration.Status.ENABLED; wc.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.TKIP); wc.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.CCMP); wc.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.WPA_PSK); wc.allowedPairwiseCiphers.set(WifiConfiguration.PairwiseCipher.TKIP); wc.allowedPairwiseCiphers.set(WifiConfiguration.PairwiseCipher.CCMP); wc.allowedProtocols.set(WifiConfiguration.Protocol.RSN); int res = mainWifi.addNetwork(wc); Log.d("WifiPreference", "add Network returned " + res ); boolean b = mainWifi.enableNetwork(res, false); Log.d("WifiPreference", "enableNetwork returned " + b ); } When I try to use addNewAccessPoint(ScanResult scanResult) it just adds another AP to the list in the settings application with the same name as the one with the best signal, so I end up with loads of duplicates and not actually attaching to them. Can anyone point me in the direction of a better solution?

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• EntityManagerFactory error on Websphere

  - by neverland

  I have a very weird problem. Have an application using Hibernate and spring.I have an entitymanger defined which uses a JNDI lookup .It looks something like this <bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean"> <property name="dataSource" ref="dataSource" /> <property name="persistenceUnitName" value="ConfigAPPPersist" /> <property name="jpaVendorAdapter"> <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter"> <property name="showSql" value="true" /> <property name="generateDdl" value="false" /> <property name="databasePlatform" value="org.hibernate.dialect.Oracle9Dialect" /> </bean> </property> </bean> <bean id="dataSource" class="org.springframework.jdbc.datasource.WebSphereDataSourceAdapter"> <property name="targetDataSource"> <bean class="org.springframework.jndi.JndiObjectFactoryBean"> <property name="jndiName" value="jdbc/pmp" /> </bean> </property> </bean> This application runs fine in DEV. But when we move to higher envs the team that deploys this application does it successfully initially but after a few restarts of the application the entitymanager starts giving this problem Caused by: javax.persistence.PersistenceException: [PersistenceUnit: ConfigAPPPersist] Unable to build EntityManagerFactory at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:677) at org.hibernate.ejb.HibernatePersistence.createContainerEntityManagerFactory(HibernatePersistence.java:132) at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory(LocalContainerEntityManagerFactoryBean.java:224) at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet(AbstractEntityManagerFactoryBean.java:291) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1368) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1334) ... 32 more Caused by: org.hibernate.MappingException: **property mapping has wrong number of columns**: com.***.***.jpa.marketing.entity.MarketBrands.$performasure_j2eeInfo type: object Now you would say this is pretty obvious the entity MarketBrands is incorrect. But its not it maps to the table just fine. And the same code works on DEV. Also the jndi cannot be incorrect since it deploys and works fine initially but throws uo this error after a restart. This is weird and not very logical. But if someone has faced this or has any idea on what might be causing this Please!! help The persistence.xml for the persitence unit has very little <?xml version="1.0" encoding="UTF-8"?> <persistence xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd" version="1.0"> <persistence-unit name="ConfigAPPPersist"> <!-- commented code --> </persistence-unit> </persistence>

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• App.config in WCF Library and its Windows Service Host

  - by inutan

  Hello there, I have two Services called TemplateService, TemplateReportService (both defined in one WCF Service Library) to be exposed to the client application. And, I am trying to host these services under Windows Service. Can anyone please guide me if App.config in Windows Service will be same as the one in WCF Library? Here is my app.config in WCF Library: <?xml version="1.0" encoding="utf-8" ?> <configuration> <system.web> <compilation debug="true" /> </system.web> <system.serviceModel> <services> <service behaviorConfiguration="ReportingComponentLibrary.TemplateServiceBehavior" name="ReportingComponentLibrary.TemplateService"> <endpoint address="" binding="wsHttpBinding" contract="ReportingComponentLibrary.ITemplateService" > <identity> <dns value="localhost" /> </identity> </endpoint> <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange" ></endpoint> <host> <baseAddresses> <add baseAddress="http://localhost:8080/ReportingComponentLibrary/TemplateService/" /> </baseAddresses> </host> </service> <service behaviorConfiguration="ReportingComponentLibrary.TemplateServiceBehavior" name="ReportingComponentLibrary.TemplateReportService"> <endpoint address="" binding="wsHttpBinding" contract="ReportingComponentLibrary.ITemplateReportService" > <identity> <dns value="localhost" /> </identity> </endpoint> <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange" /> <host> <baseAddresses> <add baseAddress="http://localhost:8080/ReportingComponentLibrary/TemplateReportService/" /> </baseAddresses> </host> </service> </services> <behaviors> <serviceBehaviors> <behavior name="ReportingComponentLibrary.TemplateServiceBehavior"> <serviceMetadata httpGetEnabled="True"/> <serviceDebug includeExceptionDetailInFaults="True" /> </behavior> </serviceBehaviors> </behaviors> </system.serviceModel> </configuration> So, the App.config in my Windows Service(Where I am hosting above two services) will be same as above or there are only some particular sections that I need to move. Please guide. Thank you!

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• How to make Flash 'play well with others'?

  - by Sensei James

  What up fam. So this isn't a question asking about memory management schemes; for those of you who may not know, the Flash Virtual Machine relies on garbage collection by using reference counting and mark and sweep (for good coverage of these topics, check out Grant Skinner's article and presentation). And yes, Flash also provides the "delete" operator, which can (unfortunately only) be used to remove the properties of dynamic objects. What I want to know is how to make it so that Flash programs don't continue to consume CPU and memory while running in the background (save loading content or communicating remotely, for example). The motivation for this question comes in part from Apple's ban on cross compiled applications (in its SDK 4) on the grounds that they do not behave as predicted with the multitasking feature central to iPhone OS 4. My intention is not only to make Flash programs that will 'pass muster' as far as multitasking in iPhone OS 4, but also to simply make better (behaving) Flash programs. Put another way, how might a Flash application mimic the multitasking feature of iPhone OS 4? Does the Flash API provide the means for a developer to put their applications to 'sleep' while other programs run, and then to 'awaken' them just as quickly? In our own program, we might do something as crude as detecting when the user has been idle (no mouse motion or key press) for (say) four seconds: var idle_id:uint = setInterval(4000, pause_program); var current_movie_clip:MovieClip; var current_frame:uint; ... // on Mouse move or key press... clearInterval(idle_id); idle_id = setInterval(4000, pause_program); ... function pause_program():void { current_movie_clip = event.target as MovieClip; current_frame = current_movie_clip.currentFrame; MovieClip(root).gotoAndStop("program_pause_screen"); } (on the program pause screen) resume_button.addEventListener(MouseEvent.CLICK, resume_program); function resume_program(event:MouseEvent) { current_movie_clip.gotoAndPlay(current_frame); } If that's the right idea, what's the best way to detect that an application should be shelved? And, more importantly, is it possible for Flash Player to detect that some of its running programs are idle, and to similarly shelve them until the user performs an action to resume them? (Please feel free to answer as much or as little of the many questions I've posed.)

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• How to run an application as root without asking for an admin password?

  - by kvaruni

  I am writing a program in Objective-C (XCode 3.2, on Snow Leopard) that is capable of either selectively blocking certain sites for a duration or only allow certain sites (and thus block all others) for a duration. The reasoning behind this program is rather simple. I tend to get distracted when I have full internet access, but I do need internet access during my working hours to get to a number of work-related websites. Clearly, this is not a permanent block, but only helps me to focus whenever I find myself wandering a bit too much. At the moment, I am using a Unix script that is called via AppleScript to obtain Administrator permissions. It then activates a number of ipfw rules and clears those after a specific duration to restore full internet access. Simple and effective, but since I am running as a standard user, it gets cumbersome to enter my administrator password each and every time I want to go "offline". Furthermore, this is a great opportunity to learn to work with XCode and Objective-C. At the moment, everything works as expected, minus the actual blocking. I can add a number of sites in a list, specify whether or not I want to block or allow these websites and I can "start" the blocking by specifying a time until which I want to stay "offline". However, I find it hard to obtain clear information on how I can run a privileged Unix command from Objective-C. Ideally, I would like to be able to store information with respect to the Administrator account into the Keychain to use these later on, so that I can simply move into "offline" mode with the convenience of clicking a button. Even more ideally, there might be some class in Objective-C with which I can block access to some/all websites for this particular user without needing to rely on privileged Unix commands. A third possibility is in starting this program with root permissions and the reducing the permissions until I need them, but since this is a GUI application that is nested in the menu bar of OS X, the results are rather awkward and getting it to run each and every time with root permission is no easy task. Anyone who can offer me some pointers or advice? Please, no security-warnings, I am fully aware that what I want to do is a potential security threat.

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• java, swing, Gridlayout problem

  - by josh

  I have a panel with GridLayout But when I'm trying to run the program, only the first button out of 100 is shown. Futhermore, the rest appear only when I move the cursor over them. What's wrong with it? Here's the whole class(Life.CELLS=10 and CellButton is a class which extends JButton) public class MainLayout extends JFrame { public MainLayout() { setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setSize(650, 750); setLayout(new FlowLayout()); //setResizable(false); final JPanel gridPanel = new JPanel(new GridLayout(Life.CELLS, Life.CELLS)); for (int i=0; i<Life.CELLS; i++) { for (int j=0; j<Life.CELLS; j++) { CellButton jb = new CellButton(i, j); jb.setPreferredSize(new Dimension(jb.getIcon().getIconHeight(), jb.getIcon().getIconWidth())); buttons[i][j] = jb; grid[i][j] = false; gridPanel.add(jb); } } add(gridPanel); } } This is code of CellButton package classes; import javax.swing.JButton; import javax.swing.ImageIcon; import javax.swing.JFrame; public class CellButton extends JButton { private int x; private int y; boolean alive; ImageIcon icon; boolean next; // icons for grids final ImageIcon dead = new ImageIcon(JFrame.class.getResource("/images/image1.gif")); final ImageIcon live = new ImageIcon(JFrame.class.getResource("/images/image2.gif")); public CellButton(int X, int Y) { super(); x = X; y = Y; alive = false; icon = dead; setIcon(icon); } public int getX() { return x; } public int getY() { return y; } public boolean isAlive() { return alive; } public void relive() { alive = true; icon = live; setIcon(icon); } public void die() { alive = false; icon = dead; setIcon(icon); } public void setNext(boolean n) { next = n; } public boolean getNext() { return next; } public ImageIcon getIcon() { return icon; } }

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• Prototype JS swallows errors in dom:loaded, and ajax callbacks?

  - by WishCow

  I can't figure out why prototype suppressess the error messages in the dom:loaded event, and in AJAX handlers. Given the following piece of HTML: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>Conforming XHTML 1.1 Template</title> <script type="text/javascript" src="prototype.js"></script> <script type="text/javascript"> document.observe('dom:loaded', function() { console.log('domready'); console.log(idontexist); }); </script> </head> <body> </body> </html> The domready event fires, I see the log in the console, but there is no indication of any errors whatsoever. If you move the console.log(idontexist); line out of the handler, you get the idontexist is not defined error in the console. I find it a little weird, that in other event handlers, like 'click', you get the error message, it seems that it's only the dom:loaded that has this problem. The same goes for AJAX handlers: new Ajax.Request('/', { method: 'get', onComplete: function(r) { console.log('xhr complete'); alert(youwontseeme); } }); You won't see any errors. This is with prototype.js 1.6.1, and I can't find any indication of this behavior in the docs, nor a way to enable error reporting in these handlers. I have tried stepping through the code with FireBug's debugger, and it seems to jump to a function on line 53 named K, when it encounters the missing variable in the dom:loaded handler: K: function(x) { return x } But how? Why? When? I can't see any try/catch block there, how does the program flow end up there? I know that I can make the errors visible by packing my dom:ready handler(s) in try/catch blocks, but that's not a very comfortable option. Same goes for registering a global onException handler for the AJAX calls. Why does it even suppress the errors? Did someone encounter this before?

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• JavaScript Image zoom with CSS3 Transforms, How to calculate Origin? (with example)

  - by Sunday Ironfoot

  I'm trying to implement an image zoom effect, a bit like how the zoom works with Google Maps, but with a grid of fix position images. I've uploaded an example of what I have so far here: http://www.dominicpettifer.co.uk/Files/MosaicZoom.html (uses CSS3 transforms so only works with Firefox, Opera, Chrome or Safari) Use your mouse wheel to zoom in/out. The HTML source is basically an outer div with an inner-div, and that inner-div contains 16 images arranged using absolute position. It's going to be a Photo Mosaic basically. I've got the zoom bit working using CSS3 transforms: $(this).find('div').css('-moz-transform', 'scale(' + scale + ')'); ...however, I'm relying on the mouse X/Y position on the outer div to zoom in on where the mouse cursor is, similar to how Google Maps functions. The problem is that if you zoom right in on an image, move the cursor to the bottom/left corner and zoom again, instead of zooming to the bottom/left corner of the image, it zooms to the bottom/left of the entire mosaic. This has the effect of appearing to jump about the mosaic as you zoom in closer while moving the mouse around, even slightly. That's basically the problem, I want the zoom to work exactly like Google Maps where it zooms exactly to where your mouse cursor position is, but I can't get my head around the Maths to calculate the transform-origin: X/Y values correctly. Please help, been stuck on this for 3 days now. Here is the full code listing for the mouse wheel event: var scale = 1; $("#mosaicContainer").mousewheel(function(e, delta) { if (delta > 0) { scale += 1; } else { scale -= 1; } scale = scale < 1 ? 1 : (scale > 40 ? 40 : scale); var x = e.pageX - $(this).offset().left; var y = e.pageY - $(this).offset().top; $(this).find('div').css('-moz-transform', 'scale(' + scale + ')') .css('-moz-transform-origin', x + 'px ' + y + 'px'); return false; });

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• WPF ComboBox in Grid Issue

  - by Nathan

  I am trying to put a series of comboboxes in a grid and then I bind them to a list. For some reason unknown to me when I click the open button on the combobox nothing happens. If I move a comobobox outside the grid it opens just fine. Can someone please tell me what I am doing wrong here. It has to be something stupid because I've used comoboxes before just fine. Here is my xaml: <Grid> <Grid.RowDefinitions> <RowDefinition Height="*" /> <RowDefinition Height="*" /> </Grid.RowDefinitions> <GroupBox Header="Download Critera" Margin="70,30" Name="groupBox1" Grid.RowSpan="2"> <Grid Height="Auto" Name="grid1" Width="Auto" Margin="0" IsHitTestVisible="False"> <Grid.RowDefinitions> <RowDefinition /> <RowDefinition /> <RowDefinition /> <RowDefinition /> <RowDefinition /> <RowDefinition /> <RowDefinition /> <RowDefinition /> </Grid.RowDefinitions> <Grid.ColumnDefinitions> <ColumnDefinition Width="*" /> <ColumnDefinition Width="*" /> </Grid.ColumnDefinitions> <TextBlock Grid.Row="1" Margin="10,5,5,5" Name="textBlock1" Text="A:" Foreground="Black" VerticalAlignment="Center" FontSize="14" FontWeight="Bold" /> <TextBlock Grid.Row="2" Margin="10,5,5,5" Name="textBlock2" Text="B:" Foreground="Black" VerticalAlignment="Center" FontWeight="Bold" /> <TextBlock Grid.Row="3" Margin="10,5,5,5" Name="textBlock3" Text="C:" Foreground="Black" VerticalAlignment="Center" FontWeight="Bold" /> <TextBlock Grid.Row="4" Margin="10,5,5,5" Name="textBlock4" Foreground="Black" Text="D:" VerticalAlignment="Center" FontWeight="Bold" /> <TextBlock Grid.Row="5" Margin="10,5,5,5" Name="textBlock5" Text="E:" Foreground="Black" TextAlignment="Left" VerticalAlignment="Center" FontWeight="Bold" /> <ComboBox x:Name="cb1" Grid.Column="1" Grid.Row="1" Margin="5" MaxDropDownHeight="100" ItemsSource="{Binding Projects}"/> <ComboBox x:Name="cb2" Grid.Column="1" Grid.Row="2" Margin="5" MaxDropDownHeight="100" ItemsSource="{Binding Projects}"/> <ComboBox x:Name="cb3" Grid.Column="1" Grid.Row="3" Margin="5" MaxDropDownHeight="100" ItemsSource="{Binding Projects}"/> <ComboBox x:Name="cb4" Grid.Column="1" Grid.Row="4" Margin="5" MaxDropDownHeight="100" ItemsSource="{Binding Projects}"/> <ComboBox x:Name="cb5" Grid.Column="1" Grid.Row="5" Margin="5" MaxDropDownHeight="100" ItemsSource="{Binding Projects}"/> </Grid> </GroupBox> </Grid>

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• Tracking upstream svn changes with git-svn and github?

  - by Joseph Turian

  How do I track upstream SVN changes using git-svn and github? I used git-svn to convert an SVN repo to git on github: $ git svn clone -s http://svn.osqa.net/svnroot/osqa/ osqa $ cd osqa $ git remote add origin [email protected]:turian/osqa.git $ git push origin master I then made a few changes in my git repo, committed, and pushed to github. Now, I am on a new machine. I want to take upstream SVN changes, merge them with my github repo, and push them to my github repo. This documentation says: "If you ever lose your local copy, just run the import again with the same settings, and you’ll get another working directory with all the necessary SVN metainfo." So I did the following. But none of the commands work as desired. How do I track upstream SVN changes using git-svn and github? What am I doing wrong? $ git svn clone -s http://svn.osqa.net/svnroot/osqa/ osqa $ cd osqa $ git remote add origin [email protected]:turian/osqa.git $ git push origin master To [email protected]:turian/osqa.git ! [rejected] master -> master (non-fast forward) error: failed to push some refs to '[email protected]:turian/osqa.git' $ git pull remote: Counting objects: 21, done. remote: Compressing objects: 100% (17/17), done. remote: Total 17 (delta 7), reused 9 (delta 0) Unpacking objects: 100% (17/17), done. From [email protected]:turian/osqa * [new branch] master -> origin/master From [email protected]:turian/osqa * [new tag] master -> master You asked me to pull without telling me which branch you want to merge with, and 'branch.master.merge' in your configuration file does not tell me either. Please name which branch you want to merge on the command line and try again (e.g. 'git pull <repository> <refspec>'). See git-pull(1) for details on the refspec. ... $ /usr//lib/git-core/git-svn rebase warning: refname 'master' is ambiguous. First, rewinding head to replay your work on top of it... Applying: Added forum/management/commands/dumpsettings.py error: Ref refs/heads/master is at 6acd747f95aef6d9bce37f86798a32c14e04b82e but expected a7109d94d813b20c230a029ecd67801e6067a452 fatal: Cannot lock the ref 'refs/heads/master'. Could not move back to refs/heads/master rebase refs/remotes/trunk: command returned error: 1

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• Display the form again ?

  - by noralain

  Hi all, I want to ask about the form in javascript .. I want to do a game that the user enter the correct word, then alert message will apeared for correct word.. When the user do the first word correctly, the program will display another word (to be corrected) .. but the problem which i faced that i can't make the form display again to continue play the game .. i used : var d = document.getElementById("form1"); d.style.visibility = "visible"; but it doesn't work !! This is my code: <title>Word Decoder</title> <script type="text/javascript"> function checkWord(word, score){ var ok = words[score].valueOf(); var ok1 = document.getElementById("wordid"); if(ok1.value == ok){ score ++; alert("Correct, your score is: " + score); var d = document.getElementById("form1"); d.style.visibility = "visible"; return false; } else { alert("Wrong Spelling"); return false; } } </script> </head> <body> <script type="text/javascript"> var words = new Array ("apple", "orange", "banana", "manago", "table"); var reWords = new Array ("alpep", "ergano", "aaabnn", "goamna", "lbeat"); var count = 0; var score = 0; "</br>"; </script> <form id="form1"> <br> <dir id="displayForm" style="position: relative; visibility: visible; display: block"> <h3><b> <script> document.write(reWords[score]);</script> </b></h3> <br> Enter the correct word: <input type="text" value="" id="wordid"/> <input type="submit" value="Check Answer ??" onclick="return checkWord(wordid, score);" /> </dir> </form> </body> Can help me to solve the problem? Again: I want the game will display a scrambled word and the user must unscrambled the word to move to the other word. The problem is i can't display the form again to make the user unscrambled the second, third ..etc words..

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• iPhone scrollView won't scroll after keyboard is closed

  - by Rob

  I was trying to implement a way to have the UITextField move up when the keyboard opened so that the user could see what they were typing but after implementing the code - it locks my scroll. The view will scroll when the user first gets to that view but after inputting text and closing the keyboard it locks the view. I suspect that it is a problem somewhere in this code: - (void) viewWillAppear:(BOOL)animated { [super viewWillAppear:animated]; NSLog(@"Registering for keyboard events"); // Register for the events [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector (keyboardDidShow:) name: UIKeyboardDidShowNotification object:nil]; [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector (keyboardDidHide:) name: UIKeyboardDidHideNotification object:nil]; // Setup content size scrollView.contentSize = CGSizeMake(SCROLLVIEW_CONTENT_WIDTH, SCROLLVIEW_CONTENT_HEIGHT); //Initially the keyboard is hidden keyboardVisible = NO; } -(void) viewWillDisappear:(BOOL)animated { NSLog (@"Unregister for keyboard events"); [[NSNotificationCenter defaultCenter] removeObserver:self]; } //**-------------------------------** - (void) keyboardDidShow: (NSNotification *)notif { NSLog(@"Keyboard is visible"); // If keyboard is visible, return if (keyboardVisible) { NSLog(@"Keyboard is already visible. Ignore notification."); return; } // Get the size of the keyboard. NSDictionary* info = [notif userInfo]; NSValue* aValue = [info objectForKey:UIKeyboardBoundsUserInfoKey]; CGSize keyboardSize = [aValue CGRectValue].size; // Save the current location so we can restore // when keyboard is dismissed offset = scrollView.contentOffset; // Resize the scroll view to make room for the keyboard CGRect viewFrame = scrollView.frame; viewFrame.size.height -= keyboardSize.height; scrollView.frame = viewFrame; CGRect textFieldRect = [activeField frame]; textFieldRect.origin.y += 10; [scrollView scrollRectToVisible:textFieldRect animated:YES]; NSLog(@"ao fim"); // Keyboard is now visible keyboardVisible = YES; } -(void) keyboardDidHide: (NSNotification *)notif { // Is the keyboard already shown if (!keyboardVisible) { NSLog(@"Keyboard is already hidden. Ignore notification."); return; } // Reset the frame scroll view to its original value scrollView.frame = CGRectMake(0, 0, SCROLLVIEW_CONTENT_WIDTH, SCROLLVIEW_CONTENT_HEIGHT); // Reset the scrollview to previous location scrollView.contentOffset = offset; // Keyboard is no longer visible keyboardVisible = NO; } -(BOOL) textFieldShouldBeginEditing:(UITextField*)textField { activeField = textField; return YES; } I defined the size above the #imports as: #define SCROLLVIEW_CONTENT_HEIGHT 1000 #define SCROLLVIEW_CONTENT_WIDTH 320 Really not sure what the issue is.

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• IPHONE SDK, How to put Void function into my BOOL??? PLEASE!

  - by Harry

  I am using the IPhone's Accelerometer to make a object move. I want to be able to make this function work and not work depending on different states. I have my code for my Accelerometer function and i want to put it into a BOOL so i can call on it when i need it, but i am having problems. Can anyone Help me put this code into a BOOL named: -(BOOL) accelerometerWorks -(void) accelerometer:(UIAccelerometer *)accelerometer didAccelerate:(UIAcceleration *)acceleration{ valueX = acceleration.x*25.5; int newX = (int)(ball.center.x +valueX); if (newX > 320-BALL_RADIUS) newX = 320-BALL_RADIUS; if (newX < 0+BALL_RADIUS) newX = 0+BALL_RADIUS; int XA = (int)(balloonbit1.center.x +valueX); if (XA > 320-BALL_RADIUS) XA = 320-BALL_RADIUS; if (XA < 0+BALL_RADIUS) XA = 0+BALL_RADIUS; int XB = (int)(balloonbit2.center.x +valueX); if (XB > 320-BALL_RADIUS) XB = 320-BALL_RADIUS; if (XB < 0+BALL_RADIUS) XB = 0+BALL_RADIUS; int XE = (int)(balloonbit5.center.x +valueX); if (XE > 320-BALL_RADIUS) XE = 320-BALL_RADIUS; if (XE < 0+BALL_RADIUS) XE = 0+BALL_RADIUS; int XF = (int)(balloonbit6.center.x +valueX); if (XF > 320-BALL_RADIUS) XF = 320-BALL_RADIUS; if (XF < 0+BALL_RADIUS) XF = 0+BALL_RADIUS; int XH = (int)(balloonbit8.center.x +valueX); if (XH > 320-BALL_RADIUS) XH = 320-BALL_RADIUS; if (XH < 0+BALL_RADIUS) XH = 0+BALL_RADIUS; ball.center = CGPointMake (newX, 415); balloonbit1.center = CGPointMake (XA, 408); balloonbit2.center = CGPointMake (XB, 395); balloonbit5.center = CGPointMake (XE, 388); balloonbit6.center = CGPointMake (XF, 413); balloonbit8.center = CGPointMake (XH, 426); } Please help. i have been trying for ages with no success. Thanks. Harry.

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• C# Spell checker Problem

  - by reggie

  I've incorporated spell check into my win forms C# project. This is my code. public void CheckSpelling() { try { // declare local variables to track error count // and information int SpellingErrors = 0; string ErrorCountMessage = string.Empty; // create an instance of a word application Microsoft.Office.Interop.Word.Application WordApp = new Microsoft.Office.Interop.Word.Application(); // hide the MS Word document during the spellcheck //WordApp.WindowState = WdWindowState.wdWindowStateMinimize; // check for zero length content in text area if (this.Text.Length > 0) { WordApp.Visible = false; // create an instance of a word document _Document WordDoc = WordApp.Documents.Add(ref emptyItem, ref emptyItem, ref emptyItem, ref oFalse); // load the content written into the word doc WordDoc.Words.First.InsertBefore(this.Text); // collect errors form new temporary document set to contain // the content of this control Microsoft.Office.Interop.Word.ProofreadingErrors docErrors = WordDoc.SpellingErrors; SpellingErrors = docErrors.Count; // execute spell check; assumes no custom dictionaries WordDoc.CheckSpelling(ref oNothing, ref oIgnoreUpperCase, ref oAlwaysSuggest, ref oNothing, ref oNothing, ref oNothing, ref oNothing, ref oNothing, ref oNothing, ref oNothing, ref oNothing, ref oNothing); // format a string to contain a report of the errors detected ErrorCountMessage = "Spell check complete; errors detected: " + SpellingErrors; // return corrected text to control's text area object first = 0; object last = WordDoc.Characters.Count - 1; this.Text = WordDoc.Range(ref first, ref last).Text; } else { // if nothing was typed into the control, abort and inform user ErrorCountMessage = "Unable to spell check an empty text box."; } WordApp.Quit(ref oFalse, ref emptyItem, ref emptyItem); System.Runtime.InteropServices.Marshal.ReleaseComObject(WordApp); // return report on errors corrected // - could either display from the control or change this to // - return a string which the caller could use as desired. // MessageBox.Show(ErrorCountMessage, "Finished Spelling Check"); } catch (Exception e) { MessageBox.Show(e.ToString()); } } The spell checker works well, the only problem is when I try to move the spell checker the main form blurs up for some reason. Also when I close the spell checker the main form is back to normal. It seems like it is opening up Microsoft word then hiding the window, only allowing the spell checker to be seen. Please help.

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• Jboss logging issue

  - by balaji

  I'm Working as deployer and server administrator. We use Jboss 4.0x AS to deploy our applications. The issue I'm facing is, Whenever we redeploy/restart the server, server.log is getting created but after sometime the logging goes off. Yes it is not at all updating the server.log file. Due to this, we could not trace the other critical issues we have. Actually we have two separate nodes and we do deploy/restarting the server separately on two nodes. We are facing the issue in both of our test and production environment. I could not trace out where exactly the issue is. Could you please help me in resolving the issue? If we have any other issues, we can check the log files. If log itself is not getting updated/logged, how can we move further in analyzing the issues without the recent/updated logs? Below are the logs found in the stdout.log: 18:55:50,303 INFO [Server] Core system initialized 18:55:52,296 INFO [WebService] Using RMI server codebase: http://kl121tez.is.klmcorp.net:8083/ 18:55:52,313 INFO [Log4jService$URLWatchTimerTask] Configuring from URL: resource:log4j.xml 18:55:52,860 ERROR [STDERR] LOG0026E The Log Manager cannot create the object AmasRBPFTraceLogger without a class name. 18:55:52,860 ERROR [STDERR] LOG0026E The Log Manager cannot create the object AmasRBPFMessageLogger without a class name. 18:55:54,273 ERROR [STDERR] LOG0026E The Log Manager cannot create the object AmasCacheTraceLogger without a class name. 18:55:54,274 ERROR [STDERR] LOG0026E The Log Manager cannot create the object AmasCacheMessageLogger without a class name. 18:55:54,334 ERROR [STDERR] LOG0026E The Log Manager cannot create the object JACCTraceLogger without a class name. 18:55:54,334 ERROR [STDERR] LOG0026E The Log Manager cannot create the object JACCMessageLogger without a class name. 18:55:56,059 INFO [ServiceEndpointManager] WebServices: jbossws-1.0.3.SP1 (date=200609291417) 18:55:56,635 INFO [Embedded] Catalina naming disabled 18:55:56,671 INFO [ClusterRuleSetFactory] Unable to find a cluster rule set in the classpath. Will load the default rule set. 18:55:56,672 INFO [ClusterRuleSetFactory] Unable to find a cluster rule set in the classpath. Will load the default rule set. 18:55:56,843 INFO [Http11BaseProtocol] Initializing Coyote HTTP/1.1 on http-0.0.0.0-8180 18:55:56,844 INFO [Catalina] Initialization processed in 172 ms 18:55:56,844 INFO [StandardService] Starting service jboss.web

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• Flash - Ease out scrolling moviclip, scrolled by sensor on each side

  - by webfac

  I am hoping someone can shed some light on this issue for me... I have a movieclip that is scrolled by means of a 'sensor' on each side of the stage. The clip scrolls fine in both directions, however here is my problem: When the users mouse leaves the stage, the movie clip stops dead in it's tracks, and this does not provide a noce smooth effect. Looking at the code below, is there any way I could tell the animation to ease out when the users mouse leaves the stage rather than simply stop suddenly? Much appreciated! class Sensor extends MovieClip { public function Sensor() { } public function onEnterFrame() { // var active:Boolean; // is mouse within sensor? if ((_level2._xmouse >= this._x) && _level2._xmouse <= (this._x + this._width)) { active = true; } else { active = false; } if(active) { // which area of the sensor is it in? var relative_position:Number; var relative_difference:Number; relative_position = _level2._xmouse / this._width * 100.0; //_level2._logger.message("relative position is " + relative_position); if (!isNaN(relative_position)) { // depending on which area it is in, tend towards a particular adjustment if(relative_position > _level2._background_right_threshold) { relative_difference = Math.abs(relative_position - _level2._background_right_threshold); //relative_difference = 10; } else if(relative_position < _level2._background_left_threshold) { relative_difference = Math.abs(_level2._background_left_threshold - relative_position); relative_difference *= -1; } else { _level2._background_ideal_adjustment = 0; } var direction:Number; if(_level2._pan_direction == "left") { direction = 1; } else { direction = -1; } _level2._background_ideal_adjustment = direction * (relative_difference / 10) * _level2._pan_augmentation; //_level2._logger.message("ideal adjustment is " + _level2._background_ideal_adjustment); if (!isNaN(_level2._background_ideal_adjustment)) { // what is the difference between the ideal adjustment and the current adjustment? // add a portion of the difference to the adjustment: // this has the effect that the adjustment "tends towards" the ideal var difference:Number; difference = _level2._background_ideal_adjustment - _level2._background_adjustment; _level2._background_adjustment += (difference / _level2._background_tension); // calculate what the new background _x position would be var background_x:Number; var projected_x:Number; background_x = _level2["_background"]._x; projected_x = background_x += _level2._background_adjustment; //_level2._logger.message("projected _x is " + projected_x); // if the _x position is valid, change it if(projected_x > 0) projected_x = 0; if(projected_x < -(_level2["_background"]._width - Stage.width)) projected_x = -(_level2["_background"]._width - Stage.width); _level2["_background"]._x = projected_x; // i recommend that you move your other movieclips with code here } } } } }

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• How do I get ELMAH to work with SQL Server (permission problems)

  - by Gary McGill

  I've got ELMAH working on my (Cassini) development server, and was quite happy with it, but now that I'm trying to move everything to my production server (IIS7), the honeymoon looks like being over. I've got past the "gotcha" with IIS7, which frankly could have been better highlighted in the documentation, and if I just use the in-memory log then it works. However, I'm trying to get it to use the SQL Server log (as I do on my development system), and I'm getting an error along the lines of: The EXECUTE permission was denied on the object ELMAH_GetErrorsXml Well, fine. I know how to grant database permissions, but I'm really struggling to understand which user and which stored procs/tables I need to grant access to. The thing that's really confusing me is that I didn't have to do anything like this to get it to work on my development server. The only difference I can see is that on my development server it seems to connect as NT AUTHORITY\IUSR, whereas on my production server it seems to connect as NT AUTHORITY\NETWORK SERVICE. (It's just using a trusted connection so I've not explicitly configured it to do that - I presume it's to do with the web server). UPDATE: I've since established that because I'm using Cassini, it was actually logging in as me (an admin) and not IUSR, which explains why I didn't get any permission problems. On my development server, the IUSR account is a member of the public database role, and has access to the required database (again as "public"). There's no explicit granting of object-level permissions. [See update above - this is irrelevant]. On my production server, I've added NETWORK SERVICE in exactly the same way (public database role, explicit access to the database as "public"). Yet, I get this permission error. Why?!! [See update above - the only reason I don't get a permission error is because I'm running as an admin]. And, of course, if the fact that it works locally is just "luck", I will need to know which SPs/tables to grant access to. My guess would be all 3 SPs and not the table, but it would be good (again) to see some documentation that makes this explicit.

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• Re-Centering JQuery Tooltips when resizing the window

  - by leeand00

  I have written a function that positions a tooltip just above a textbox. The function takes two arguments: textBoxId - The ID of the textbox above which the tooltip will appear. Example: "#textBoxA" toolTipId - The ID of the tooltip which will appear above the textbox. Example: "#toolTipA" function positionTooltip(textBoxId, toolTipId){ var hoverElementOffsetLeft = $(textBoxId).offset().left; var hoverElementOffsetWidth = $(textBoxId)[0].offsetWidth; var toolTipElementOffsetLeft = $(toolTipId).offset().left; var toolTipElementOffsetWidth = $(toolTipId)[0].offsetWidth; // calcluate the x coordinate of the center of the hover element. var hoverElementCenterX = hoverElementOffsetLeft + (hoverElementOffsetWidth / 2); // calculate half the width of the toolTipElement var toolTipElementHalfWidth = toolTipElementOffsetWidth / 2; var toolTipElementLeft = hoverElementCenterX - toolTipElementHalfWidth; $(toolTipId)[0].style.left = toolTipElementLeft + "px"; var toolTipElementHeight = $(toolTipId)[0].offsetHeight; var hoverElementOffsetTop = $(textBoxId).offset().top; var toolTipYCoord = hoverElementOffsetTop - toolTipElementHeight; toolTipYCoord = toolTipYCoord - 10; $(toolTipId)[0].style.top = toolTipYCoord + "px"; $(toolTipId).hide(); $(textBoxId).hover( function(){ $(toolTipId + ':hidden').fadeIn(); }, function(){ $(toolTipId + ':visible').fadeOut(); } ); $(textBoxId).focus ( function(){ $(toolTipId + ':hidden').fadeIn(); } ); $(textBoxId).blur ( function(){ $(toolTipId+ ':visible').fadeOut(); } ); } The function works fine upon initial page load: However, after the user resizes the window the tooltips move to locations that no longer display above their associated textbox. I've tried writing some code to fix the problem by calling the positionTooltip() function when the window is resized but for some reason the tooltips do not get repositioned as they did when the page loaded: var _resize_timer = null; $(window).resize(function() { if (_resize_timer) {clearTimeout(_resize_timer);} _resize_timer = setTimeout(function(){ positionTooltip('#textBoxA', ('#toolTipA')); }, 1000); }); I'm really at a loss here as to why it doesn't reposition the tooltip correctly as it did when the page was initially loaded after a resize.

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• Rendering javascript at the server side level. A good or bad idea?

  - by davidhong

  I want to make it clear first: This isn't a question in relation to server-side Javascript or running Javascript server side. This is a question regarding rendering of Javascript code (which will be executed on the client-side) from server-side code. Having said that, take a look at below ASP.net code for example: hlRemoveCategory.Attributes.Add("onclick", "return confirm('Are you sure you want to delete this?');") This is prescribing the client-side onclick event on the server-side. As oppose to: $('a[rel=remove]').bind('click', function(event) { return confirm('Are you sure you want to delete this?'); } Now the question I want to ask is: What is the benefit of rendering javascript from the server-side code? Or the vice-versa? I personally prefer the second way of hooking up client-side UI/behaviour to HTML elements for the following reasons: Server-side does what ever it needs to already, including data-validation, event delegation and etc; and What server-side sees as an event is not necessarily the same process on the client-side. i.e., there are plenty more events on client-side (just look at custom events); and What happens on client-side and on server-side, during an event, could be completely irrelevant and decoupled; and What ever happens on client-side happens on client-side, there is no need for the server to know. Server should process and run what is given to them, how the process comes to life is not really up to them to decide in the event of the client-side events; and so and so forth. These are my thoughts obviously. I want to know what others think and if there has been any discussions on this topic. Topics branching from this argument can reach: Code management: is it easier to render everything from server-side? Separation of concern: is it easier if client-side logic is separated to server-side logic? Efficiency: which is more efficient both in terms of coding and running? At the end of the day, I am trying to move my team to go towards the second approach. There are lot of old guys in this team who are afraid of this change. I just wish to convince them with the right facts and stats. Let me know your thoughts.

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• agent-based simulation: performance issue: Python vs NetLogo & Repast

  - by max

  I'm replicating a small piece of Sugarscape agent simulation model in Python 3. I found the performance of my code is ~3 times slower than that of NetLogo. Is it likely the problem with my code, or can it be the inherent limitation of Python? Obviously, this is just a fragment of the code, but that's where Python spends two-thirds of the run-time. I hope if I wrote something really inefficient it might show up in this fragment: UP = (0, -1) RIGHT = (1, 0) DOWN = (0, 1) LEFT = (-1, 0) all_directions = [UP, DOWN, RIGHT, LEFT] # point is just a tuple (x, y) def look_around(self): max_sugar_point = self.point max_sugar = self.world.sugar_map[self.point].level min_range = 0 random.shuffle(self.all_directions) for r in range(1, self.vision+1): for d in self.all_directions: p = ((self.point[0] + r * d[0]) % self.world.surface.length, (self.point[1] + r * d[1]) % self.world.surface.height) if self.world.occupied(p): # checks if p is in a lookup table (dict) continue if self.world.sugar_map[p].level > max_sugar: max_sugar = self.world.sugar_map[p].level max_sugar_point = p if max_sugar_point is not self.point: self.move(max_sugar_point) Roughly equivalent code in NetLogo (this fragment does a bit more than the Python function above): ; -- The SugarScape growth and motion procedures. -- to M ; Motion rule (page 25) locals [ps p v d] set ps (patches at-points neighborhood) with [count turtles-here = 0] if (count ps > 0) [ set v psugar-of max-one-of ps [psugar] ; v is max sugar w/in vision set ps ps with [psugar = v] ; ps is legal sites w/ v sugar set d distance min-one-of ps [distance myself] ; d is min dist from me to ps agents set p random-one-of ps with [distance myself = d] ; p is one of the min dist patches if (psugar >= v and includeMyPatch?) [set p patch-here] setxy pxcor-of p pycor-of p ; jump to p set sugar sugar + psugar-of p ; consume its sugar ask p [setpsugar 0] ; .. setting its sugar to 0 ] set sugar sugar - metabolism ; eat sugar (metabolism) set age age + 1 end On my computer, the Python code takes 15.5 sec to run 1000 steps; on the same laptop, the NetLogo simulation running in Java inside the browser finishes 1000 steps in less than 6 sec. EDIT: Just checked Repast, using Java implementation. And it's also about the same as NetLogo at 5.4 sec. Recent comparisons between Java and Python suggest no advantage to Java, so I guess it's just my code that's to blame? EDIT: I understand MASON is supposed to be even faster than Repast, and yet it still runs Java in the end.

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• Uncenter MkMapView

  - by Makinitez21

  I am trying to "uncenter" the map view and remove all annotations. the reason for this is that the mapView will be used by different view controllers to display different annotations and locations. What's happening now is that i am using the "remove annotations" method and i removes them, but the map stays centered on the spot and thus when the new annotations come in, it does not move. Is there a way to reset the region and if so, what value do i reset it to. I tried nil, zero and some calculated value but "core animation" says they are all invalid. how do i get that to zoom out and back in on my new annotations? here is some code -(void)recenterMap { NSArray *coordinates = [_mapView valueForKeyPath:@"annotations.coordinate"]; CLLocationCoordinate2D maxCoord = {-90.0f, -180.0f}; CLLocationCoordinate2D minCoord = {90.0f, 180.0f}; //NSLog(@"%@", [coordinates description]); for (NSValue *value in coordinates) { CLLocationCoordinate2D coord = {0.0f, 0.0f}; [value getValue: &coord]; if(coord.longitude > maxCoord.longitude) { maxCoord.longitude = coord.longitude; } if(coord.latitude > maxCoord.latitude){ maxCoord.latitude = coord.latitude; } if(coord.longitude < minCoord.longitude){ minCoord.longitude = coord.longitude; } if(coord.latitude < minCoord.latitude){ minCoord.latitude = coord.latitude; } } MKCoordinateRegion region = {{0.0f, 0.0f}, {0.0f, 0.0f}}; region.center.longitude = (minCoord.longitude + maxCoord.longitude) / 2.0; region.center.latitude = (minCoord.latitude + maxCoord.latitude) / 2.0; region.span.longitudeDelta = maxCoord.longitude - minCoord.longitude; region.span.latitudeDelta = maxCoord.latitude - minCoord.latitude; [_mapView setRegion: region animated: YES]; } Thats the recenter methos i'm using - (MKAnnotationView *)mapView: (MKMapView *)mapView viewForAnnotation: (id <MKAnnotation>)annotation{ MKAnnotationView *view = nil; if(annotation != mapView.userLocation){ Annotation *schoolAnn = (Annotation*)annotation; view = [self.mapView dequeueReusableAnnotationViewWithIdentifier:@"schoolLoc"]; if(nil == view){ view = [[[MKPinAnnotationView alloc] initWithAnnotation:schoolAnn reuseIdentifier:@"schoolLoc"]autorelease]; } [(MKPinAnnotationView *)view setAnimatesDrop:YES]; [view setCanShowCallout:YES]; } else { [self recenterMap]; } return view; } This "else" piece waits until the blue marble drops in then recenters the map. The problem i have with that part is that when i go back to the previous View Controller i remove all annotations, so when i come back in the User location (for some reason) does not pop back in. How do i get this to pop back in? thanks in advance guys

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• Any tool(s) for knowing the layout (segments) of running process in Windows?

  - by claws

  I've always been curious about How exactly the process looks in memory? What are the different segments(parts) in it? How exactly will be the program (on the disk) & process (in the memory) are related? My previous question: http://stackoverflow.com/questions/1966920/more-info-on-memory-layout-of-an-executable-program-process In my quest, I finally found a answer. I found this excellent article that cleared most of my queries: http://www.linuxforums.org/articles/understanding-elf-using-readelf-and-objdump_125.html In the above article, author shows how to get different segments of the process (LINUX) & he compares it with its corresponding ELF file. I'm quoting this section here: Courious to see the real layout of process segment? We can use /proc//maps file to reveal it. is the PID of the process we want to observe. Before we move on, we have a small problem here. Our test program runs so fast that it ends before we can even dump the related /proc entry. I use gdb to solve this. You can use another trick such as inserting sleep() before it calls return(). In a console (or a terminal emulator such as xterm) do: $ gdb test (gdb) b main Breakpoint 1 at 0x8048376 (gdb) r Breakpoint 1, 0x08048376 in main () Hold right here, open another console and find out the PID of program "test". If you want the quick way, type: $ cat /proc/`pgrep test`/maps You will see an output like below (you might get different output): [1] 0039d000-003b2000 r-xp 00000000 16:41 1080084 /lib/ld-2.3.3.so [2] 003b2000-003b3000 r--p 00014000 16:41 1080084 /lib/ld-2.3.3.so [3] 003b3000-003b4000 rw-p 00015000 16:41 1080084 /lib/ld-2.3.3.so [4] 003b6000-004cb000 r-xp 00000000 16:41 1080085 /lib/tls/libc-2.3.3.so [5] 004cb000-004cd000 r--p 00115000 16:41 1080085 /lib/tls/libc-2.3.3.so [6] 004cd000-004cf000 rw-p 00117000 16:41 1080085 /lib/tls/libc-2.3.3.so [7] 004cf000-004d1000 rw-p 004cf000 00:00 0 [8] 08048000-08049000 r-xp 00000000 16:06 66970 /tmp/test [9] 08049000-0804a000 rw-p 00000000 16:06 66970 /tmp/test [10] b7fec000-b7fed000 rw-p b7fec000 00:00 0 [11] bffeb000-c0000000 rw-p bffeb000 00:00 0 [12] ffffe000-fffff000 ---p 00000000 00:00 0 Note: I add number on each line as reference. Back to gdb, type: (gdb) q So, in total, we see 12 segment (also known as Virtual Memory Area--VMA). But I want to know about Windows Process & PE file format. Any tool(s) for getting the layout (segments) of running process in Windows? Any other good resources for learning more on this subject? EDIT: Are there any good articles which shows the mapping between PE file sections & VA segments?

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• How does MySQL's ORDER BY RAND() work?

  - by Eugene

  Hi, I've been doing some research and testing on how to do fast random selection in MySQL. In the process I've faced some unexpected results and now I am not fully sure I know how ORDER BY RAND() really works. I always thought that when you do ORDER BY RAND() on the table, MySQL adds a new column to the table which is filled with random values, then it sorts data by that column and then e.g. you take the above value which got there randomly. I've done lots of googling and testing and finally found that the query Jay offers in his blog is indeed the fastest solution: SELECT * FROM Table T JOIN (SELECT CEIL(MAX(ID)*RAND()) AS ID FROM Table) AS x ON T.ID >= x.ID LIMIT 1; While common ORDER BY RAND() takes 30-40 seconds on my test table, his query does the work in 0.1 seconds. He explains how this functions in the blog so I'll just skip this and finally move to the odd thing. My table is a common table with a PRIMARY KEY id and other non-indexed stuff like username, age, etc. Here's the thing I am struggling to explain SELECT * FROM table ORDER BY RAND() LIMIT 1; /*30-40 seconds*/ SELECT id FROM table ORDER BY RAND() LIMIT 1; /*0.25 seconds*/ SELECT id, username FROM table ORDER BY RAND() LIMIT 1; /*90 seconds*/ I was sort of expecting to see approximately the same time for all three queries since I am always sorting on a single column. But for some reason this didn't happen. Please let me know if you any ideas about this. I have a project where I need to do fast ORDER BY RAND() and personally I would prefer to use SELECT id FROM table ORDER BY RAND() LIMIT 1; SELECT * FROM table WHERE id=ID_FROM_PREVIOUS_QUERY LIMIT 1; which, yes, is slower than Jay's method, however it is smaller and easier to understand. My queries are rather big ones with several JOINs and with WHERE clause and while Jay's method still works, the query grows really big and complex because I need to use all the JOINs and WHERE in the JOINed (called x in his query) sub request. Thanks for your time!

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• Correct way of using/testing event service in Eclipse E4 RCP

  - by Thorsten Beck

  Allow me to pose two coupled questions that might boil down to one about good application design ;-) What is the best practice for using event based communication in an e4 RCP application? How can I write simple unit tests (using JUnit) for classes that send/receive events using dependency injection and IEventBroker ? Let’s be more concrete: say I am developing an Eclipse e4 RCP application consisting of several plugins that need to communicate. For communication I want to use the event service provided by org.eclipse.e4.core.services.events.IEventBroker so my plugins stay loosely coupled. I use dependency injection to inject the event broker to a class that dispatches events: @Inject static IEventBroker broker; private void sendEvent() { broker.post(MyEventConstants.SOME_EVENT, payload) } On the receiver side, I have a method like: @Inject @Optional private void receiveEvent(@UIEventTopic(MyEventConstants.SOME_EVENT) Object payload) Now the questions: In order for IEventBroker to be successfully injected, my class needs access to the current IEclipseContext. Most of my classes using the event service are not referenced by the e4 application model, so I have to manually inject the context on instantiation using e.g. ContextInjectionFactory.inject(myEventSendingObject, context); This approach works but I find myself passing around a lot of context to wherever I use the event service. Is this really the correct approach to event based communication across an E4 application? how can I easily write JUnit tests for a class that uses the event service (either as a sender or receiver)? Obviously, none of the above annotations work in isolation since there is no context available. I understand everyone’s convinced that dependency injection simplifies testability. But does this also apply to injecting services like the IEventBroker? This article describes creation of your own IEclipseContext to include the process of DI in tests. Not sure if this could resolve my 2nd issue but I also hesitate running all my tests as JUnit Plug-in tests as it appears impractible to fire up the PDE for each unit test. Maybe I just misunderstand the approach. This article speaks about “simply mocking IEventBroker”. Yes, that would be great! Unfortunately, I couldn’t find any information on how this can be achieved. All this makes me wonder whether I am still on a "good path" or if this is already a case of bad design? And if so, how would you go about redesigning? Move all event related actions to dedicated event sender/receiver classes or a dedicated plugin?

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