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• LNK2005: delete already defined error in VC++

  - by user333422

  Hi, I am newbie to VC++, so please forgive me if this is stupid. I have got 7 solutions under one project. Six of these build static libraries which is linked inside 7th to produce an exe. The runtime configuration of all the projects is MultiThreaded Debug. sln which is used to produce exe is using MFC other slns use standard runtiem library. I tried changing those to MFC, but still I am getting the same error. All the six slns build successfully. When I try to build exe - get the follwoing error: nafxcwd.lib(afxmem.obj) : error LNK2005: "void __cdecl operator delete(void *,int,char const *,int)" (??3@YAXPAXHPBDH@Z) already defined in tara_common.lib(fileStream.obj) This is weird because tara_common is one of the libs that I generated and fileStream.cpp is file that is just using delete on a pointer. I built it in verbose mod, so I am attaching the output. ENVIRONMENT SPACE _ACP_ATLPROV=C:\Program Files\Microsoft Visual Studio 9.0\VC\Bin\ATLProv.dll _ACP_INCLUDE=C:\Program Files\Microsoft Visual Studio 9.0\VC\include;C:\Program Files\Microsoft Visual Studio 9.0\VC\atlmfc\include;C:\Program Files\Microsoft SDKs\Windows\v6.0A\include;C:\Program Files\Microsoft SDKs\Windows\v6.0A\include _ACP_LIB=C:\fta\tara\database\build\Debug;C:\Program Files\Microsoft Visual Studio 9.0\VC\lib;C:\Program Files\Microsoft Visual Studio 9.0\VC\atlmfc\lib;C:\Program Files\Microsoft Visual Studio 9.0\VC\atlmfc\lib\i386;C:\Program Files\Microsoft SDKs\Windows\v6.0A\lib;C:\Program Files\Microsoft SDKs\Windows\v6.0A\lib;C:\Program Files\Microsoft Visual Studio 9.0\;C:\Program Files\Microsoft Visual Studio 9.0\lib _ACP_PATH=C:\Program Files\Microsoft Visual Studio 9.0\VC\bin;C:\Program Files\Microsoft SDKs\Windows\v6.0A\bin;C:\Program Files\Microsoft Visual Studio 9.0\Common7\Tools\bin;C:\Program Files\Microsoft Visual Studio 9.0\Common7\tools;C:\Program Files\Microsoft Visual Studio 9.0\Common7\ide;C:\Program Files\HTML Help Workshop;C:\Program Files\Microsoft SDKs\Windows\v6.0A\bin;c:\WINDOWS\Microsoft.NET\Framework\v2.0.50727;C:\Program Files\Microsoft Visual Studio 9.0\;C:\WINDOWS\SysWow64;;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;c:\Program Files\Microsoft SQL Server\90\Tools\binn\;C:\Program Files\TortoiseSVN\bin;C:\Program Files\Microsoft Visual Studio 9.0\VC\bin;C:\Program Files\GnuWin32\bin;C:\Python26 ALLUSERSPROFILE=C:\Documents and Settings\All Users CLIENTNAME=Console CommonProgramFiles=C:\Program Files\Common Files ComSpec=C:\WINDOWS\system32\cmd.exe FP_NO_HOST_CHECK=NO HOMEDRIVE=C: INCLUDE=C:\Program Files\Microsoft Visual Studio 9.0\VC\include;C:\Program Files\Microsoft Visual Studio 9.0\VC\atlmfc\include;C:\Program Files\Microsoft SDKs\Windows\v6.0A\include;C:\Program Files\Microsoft SDKs\Windows\v6.0A\include LIB=C:\fta\tara\database\build\Debug;C:\Program Files\Microsoft Visual Studio 9.0\VC\lib;C:\Program Files\Microsoft Visual Studio 9.0\VC\atlmfc\lib;C:\Program Files\Microsoft Visual Studio 9.0\VC\atlmfc\lib\i386;C:\Program Files\Microsoft SDKs\Windows\v6.0A\lib;C:\Program Files\Microsoft SDKs\Windows\v6.0A\lib;C:\Program Files\Microsoft Visual Studio 9.0\;C:\Program Files\Microsoft Visual Studio 9.0\lib LIBPATH=c:\WINDOWS\Microsoft.NET\Framework\v2.0.50727;C:\Program Files\Microsoft Visual Studio 9.0\VC\atlmfc\lib;C:\Program Files\Microsoft Visual Studio 9.0\VC\lib LOGONSERVER=\xxx NUMBER_OF_PROCESSORS=1 OS=Windows_NT PATH=C:\Program Files\Microsoft Visual Studio 9.0\VC\bin;C:\Program Files\Microsoft SDKs\Windows\v6.0A\bin;C:\Program Files\Microsoft Visual Studio 9.0\Common7\Tools\bin;C:\Program Files\Microsoft Visual Studio 9.0\Common7\tools;C:\Program Files\Microsoft Visual Studio 9.0\Common7\ide;C:\Program Files\HTML Help Workshop;C:\Program Files\Microsoft SDKs\Windows\v6.0A\bin;c:\WINDOWS\Microsoft.NET\Framework\v2.0.50727;C:\Program Files\Microsoft Visual Studio 9.0\;C:\WINDOWS\SysWow64;;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;c:\Program Files\Microsoft SQL Server\90\Tools\binn\;C:\Program Files\TortoiseSVN\bin;C:\Program Files\Microsoft Visual Studio 9.0\VC\bin;C:\Program Files\GnuWin32\bin;C:\Python26 PATHEXT=.COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH PROCESSOR_ARCHITECTURE=x86 PROCESSOR_IDENTIFIER=x86 Family 6 Model 23 Stepping 10, GenuineIntel PROCESSOR_LEVEL=6 PROCESSOR_REVISION=170a ProgramFiles=C:\Program Files SESSIONNAME=Console SystemDrive=C: SystemRoot=C:\WINDOWS VisualStudioDir=C:\Documents and Settings\sgupta\My Documents\Visual Studio 2008 VS90COMNTOOLS=C:\Program Files\Microsoft Visual Studio 9.0\Common7\Tools\ WecVersionForRosebud.710=2 windir=C:\WINDOWS COMMAND LINES: Creating temporary file "c:\fta\tools\channel_editor\IvoDB\Debug\RSP00011018082288.rsp" with contents [ /VERBOSE /OUT:"C:\fta\tools\channel_editor\Builds\IvoDB_1_35_Debug.exe" /INCREMENTAL /LIBPATH:"......\3rdparty\boost_1_42_0\stage\lib" /MANIFEST /MANIFESTFILE:"Debug\IvoDB_1_35_Debug.exe.intermediate.manifest" /MANIFESTUAC:"level='asInvoker' uiAccess='false'" /DELAYLOAD:"OleAcc.dll" /DEBUG /PDB:"C:\fta\tools\channel_editor\Builds\IvoDB_1_35_Debug.pdb" /SUBSYSTEM:WINDOWS /DYNAMICBASE /NXCOMPAT /MACHINE:X86 ......\tara\database\build\Debug\tara_database.lib ......\tara\common\build\Debug\tara_common.lib ......\3rdparty\sqliteWrapper\Debug\sqliteWrapper.lib ......\3rdparty\sqlite_3_6_18\Debug\sqlite.lib ......\stsdk\modules\win32\Debug\modules.lib ......\stsdk\axeapi\win32\Debug\axeapi.lib DelayImp.lib ".\Debug\AntennaSettings.obj" ".\Debug\AudioVideoSettings.obj" ".\Debug\CMDatabase.obj" ".\Debug\CMSettings.obj" ".\Debug\ColorFileDialog.obj" ".\Debug\ColorStatic.obj" ".\Debug\DragDropListCtrl.obj" ".\Debug\DragDropTreeCtrl.obj" ".\Debug\FavouriteEdit.obj" ".\Debug\FavTab.obj" ".\Debug\FindProgram.obj" ".\Debug\HyperLink.obj" ".\Debug\IvoDB.obj" ".\Debug\IvoDBDlg.obj" ".\Debug\IvoDBInfo.obj" ".\Debug\IvoDBInfoTab.obj" ".\Debug\IvoDbStruct.obj" ".\Debug\LayoutHelper.obj" ".\Debug\MainTab.obj" ".\Debug\OperTabCtrl.obj" ".\Debug\ParentalLock.obj" ".\Debug\ProgramEdit.obj" ".\Debug\ProgramTab.obj" ".\Debug\PVRSettings.obj" ".\Debug\SatTab.obj" ".\Debug\SettingsBase.obj" ".\Debug\SettingsTab.obj" ".\Debug\STBSettings.obj" ".\Debug\stdafx.obj" ".\Debug\TimeDate.obj" ".\Debug\TransponderEdit.obj" ".\Debug\TreeTab.obj" ".\Debug\UserPreferences.obj" ".\Debug\Xmodem.obj" ".\Debug\IvoDB.res" ".\Debug\IvoDB_1_35_Debug.exe.embed.manifest.res" ] Creating command line "link.exe @c:\fta\tools\channel_editor\IvoDB\Debug\RSP00011018082288.rsp /NOLOGO /ERRORREPORT:PROMPT" **Processed /DEFAULTLIB:atlsd.lib Processed /DEFAULTLIB:ws2_32.lib Processed /DEFAULTLIB:mswsock.lib Processed /DISALLOWLIB:mfc90d.lib Processed /DISALLOWLIB:mfcs90d.lib Processed /DISALLOWLIB:mfc90.lib Processed /DISALLOWLIB:mfcs90.lib Processed /DISALLOWLIB:mfc90ud.lib Processed /DISALLOWLIB:mfcs90ud.lib Processed /DISALLOWLIB:mfc90u.lib Processed /DISALLOWLIB:mfcs90u.lib Processed /DISALLOWLIB:uafxcwd.lib Processed /DISALLOWLIB:uafxcw.lib Processed /DISALLOWLIB:nafxcw.lib Found "void __cdecl operator delete(void *)" (??3@YAXPAX@Z) Referenced in axeapi.lib(ipcgeneric.obj) Referenced in axeapi.lib(ipccommon.obj) Referenced in axeapi.lib(activeobject.obj) Referenced in nafxcwd.lib(nolib.obj) Referenced in sqliteWrapper.lib(DbConnection.obj) Referenced in sqliteWrapper.lib(Statement.obj) Referenced in axeapi.lib(nvstorage.obj) Referenced in axeapi.lib(avctrler.obj) Referenced in tara_common.lib(trace.obj) Referenced in tara_common.lib(ssPrintf.obj) Referenced in tara_common.lib(taraConfig.obj) Referenced in tara_common.lib(stream.obj) Referenced in tara_common.lib(STBConfigurationStorage.obj) Referenced in tara_common.lib(STBConfiguration.obj) Referenced in tara_common.lib(configParser.obj) Referenced in tara_common.lib(fileStream.obj) Referenced in tara_database.lib(SatStream.obj) Referenced in tara_database.lib(Service.obj) Referenced in tara_database.lib(ServiceList.obj) Referenced in tara_common.lib(playerConfig.obj) Referenced in UserPreferences.obj Referenced in Xmodem.obj Referenced in tara_database.lib(init.obj) Referenced in tara_database.lib(Satellite.obj) Referenced in TransponderEdit.obj Referenced in TreeTab.obj Referenced in TreeTab.obj Referenced in UserPreferences.obj Referenced in stdafx.obj Referenced in TimeDate.obj Referenced in TimeDate.obj Referenced in TransponderEdit.obj Referenced in SettingsTab.obj Referenced in SettingsTab.obj Referenced in STBSettings.obj Referenced in STBSettings.obj Referenced in SatTab.obj Referenced in SatTab.obj Referenced in SettingsBase.obj Referenced in SettingsBase.obj Referenced in ProgramTab.obj Referenced in ProgramTab.obj Referenced in PVRSettings.obj Referenced in PVRSettings.obj Referenced in ParentalLock.obj Referenced in ParentalLock.obj Referenced in ProgramEdit.obj Referenced in ProgramEdit.obj Referenced in MainTab.obj Referenced in MainTab.obj Referenced in OperTabCtrl.obj Referenced in OperTabCtrl.obj Referenced in IvoDBInfoTab.obj Referenced in IvoDbStruct.obj Referenced in LayoutHelper.obj Referenced in LayoutHelper.obj Referenced in IvoDBDlg.obj Referenced in IvoDBInfo.obj Referenced in IvoDBInfo.obj Referenced in IvoDBInfoTab.obj Referenced in HyperLink.obj Referenced in IvoDB.obj Referenced in IvoDB.obj Referenced in IvoDBDlg.obj Referenced in FavTab.obj Referenced in FavTab.obj Referenced in FindProgram.obj Referenced in FindProgram.obj Referenced in DragDropTreeCtrl.obj Referenced in DragDropTreeCtrl.obj Referenced in FavouriteEdit.obj Referenced in FavouriteEdit.obj Referenced in ColorFileDialog.obj Referenced in ColorStatic.obj Referenced in DragDropListCtrl.obj Referenced in DragDropListCtrl.obj Referenced in CMDatabase.obj Referenced in CMDatabase.obj Referenced in CMSettings.obj Referenced in CMSettings.obj Referenced in AntennaSettings.obj Referenced in AntennaSettings.obj Referenced in AudioVideoSettings.obj Referenced in AudioVideoSettings.obj Loaded nafxcwd.lib(afxmem.obj) nafxcwd.lib(afxmem.obj) : error LNK2005: "void __cdecl operator delete(void *,int,char const *,int)" (??3@YAXPAXHPBDH@Z) already defined in tara_common.lib(fileStream.obj)** Please help me out, I have already wasted 3 days looking on net and trying all the possible solutions I found. thanks in advance, SG

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• How to send audio stream via UDP in java?

  - by Nob Venoda

  Hi to all :) I have a problem, i have set MediaLocator to microphone input, and then created Player. I need to grab that sound from the microphone, encode it to some lower quality stream, and send it as a datagram packet via UDP. Here's the code, i found most of it online and adapted it to my app: public class AudioSender extends Thread { private MediaLocator ml = new MediaLocator("javasound://44100"); private DatagramSocket socket; private boolean transmitting; private Player player; TargetDataLine mic; byte[] buffer; private AudioFormat format; private DatagramSocket datagramSocket(){ try { return new DatagramSocket(); } catch (SocketException ex) { return null; } } private void startMic() { try { format = new AudioFormat(AudioFormat.Encoding.PCM_SIGNED, 8000.0F, 16, 2, 4, 8000.0F, true); DataLine.Info info = new DataLine.Info(TargetDataLine.class, format); mic = (TargetDataLine) AudioSystem.getLine(info); mic.open(format); mic.start(); buffer = new byte[1024]; } catch (LineUnavailableException ex) { Logger.getLogger(AudioSender.class.getName()).log(Level.SEVERE, null, ex); } } private Player createPlayer() { try { return Manager.createRealizedPlayer(ml); } catch (IOException ex) { return null; } catch (NoPlayerException ex) { return null; } catch (CannotRealizeException ex) { return null; } } private void send() { try { mic.read(buffer, 0, 1024); DatagramPacket packet = new DatagramPacket( buffer, buffer.length, InetAddress.getByName(Util.getRemoteIP()), 91); socket.send(packet); } catch (IOException ex) { Logger.getLogger(AudioSender.class.getName()).log(Level.SEVERE, null, ex); } } @Override public void run() { player = createPlayer(); player.start(); socket = datagramSocket(); transmitting = true; startMic(); while (transmitting) { send(); } } public static void main(String[] args) { AudioSender as = new AudioSender(); as.start(); } } And only thing that happens when I run the receiver class, is me hearing this Player from the sender class. And I cant seem to see the connection between TargetDataLine and Player. Basically, I need to get the sound form player, and somehow convert it to bytes[], therefore I can sent it as datagram. Any ideas? Everything is acceptable, as long as it works :)

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• Can I query DOM Document with xpath expression from multiple threads safely?

  - by Dan

  I plan to use dom4j DOM Document as a static cache in an application where multiples threads can query the document. Taking into the account that the document itself will never change, is it safe to query it from multiple threads? I wrote the following code to test it, but I am not sure that it actually does prove that operation is safe? package test.concurrent_dom; import org.dom4j.Document; import org.dom4j.DocumentException; import org.dom4j.DocumentHelper; import org.dom4j.Element; import org.dom4j.Node; /** * Hello world! * */ public class App extends Thread { private static final String xml = "<Session>" + "<child1 attribute1=\"attribute1value\" attribute2=\"attribute2value\">" + "ChildText1</child1>" + "<child2 attribute1=\"attribute1value\" attribute2=\"attribute2value\">" + "ChildText2</child2>" + "<child3 attribute1=\"attribute1value\" attribute2=\"attribute2value\">" + "ChildText3</child3>" + "</Session>"; private static Document document; private static Element root; public static void main( String[] args ) throws DocumentException { document = DocumentHelper.parseText(xml); root = document.getRootElement(); Thread t1 = new Thread(){ public void run(){ while(true){ try { sleep(3); } catch (InterruptedException e) { e.printStackTrace(); } Node n1 = root.selectSingleNode("/Session/child1"); if(!n1.getText().equals("ChildText1")){ System.out.println("WRONG!"); } } } }; Thread t2 = new Thread(){ public void run(){ while(true){ try { sleep(3); } catch (InterruptedException e) { e.printStackTrace(); } Node n1 = root.selectSingleNode("/Session/child2"); if(!n1.getText().equals("ChildText2")){ System.out.println("WRONG!"); } } } }; Thread t3 = new Thread(){ public void run(){ while(true){ try { sleep(3); } catch (InterruptedException e) { e.printStackTrace(); } Node n1 = root.selectSingleNode("/Session/child3"); if(!n1.getText().equals("ChildText3")){ System.out.println("WRONG!"); } } } }; t1.start(); t2.start(); t3.start(); System.out.println( "Hello World!" ); } }

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• What might cause the big overhead of making a HttpWebRequest call?

  - by Dimitri C.

  When I send/receive data using HttpWebRequest (on Silverlight, using the HTTP POST method) in small blocks, I measure the very small throughput of 500 bytes/s over a "localhost" connection. When sending the data in large blocks, I get 2 MB/s, which is some 5000 times faster. Does anyone know what could cause this incredibly big overhead? Update: I did the performance measurement on both Firefox 3.6 and Internet Explorer 7. Both showed similar results. Update: The Silverlight client-side code I use is essentially my own implementation of the WebClient class. The reason I wrote it is because I noticed the same performance problem with WebClient, and I thought that the HttpWebRequest would allow to tweak the performance issue. Regrettably, this did not work. The implementation is as follows: public class HttpCommChannel { public delegate void ResponseArrivedCallback(object requestContext, BinaryDataBuffer response); public HttpCommChannel(ResponseArrivedCallback responseArrivedCallback) { this.responseArrivedCallback = responseArrivedCallback; this.requestSentEvent = new ManualResetEvent(false); this.responseArrivedEvent = new ManualResetEvent(true); } public void MakeRequest(object requestContext, string url, BinaryDataBuffer requestPacket) { responseArrivedEvent.WaitOne(); responseArrivedEvent.Reset(); this.requestMsg = requestPacket; this.requestContext = requestContext; this.webRequest = WebRequest.Create(url) as HttpWebRequest; this.webRequest.AllowReadStreamBuffering = true; this.webRequest.ContentType = "text/plain"; this.webRequest.Method = "POST"; this.webRequest.BeginGetRequestStream(new AsyncCallback(this.GetRequestStreamCallback), null); this.requestSentEvent.WaitOne(); } void GetRequestStreamCallback(IAsyncResult asynchronousResult) { System.IO.Stream postStream = webRequest.EndGetRequestStream(asynchronousResult); postStream.Write(requestMsg.Data, 0, (int)requestMsg.Size); postStream.Close(); requestSentEvent.Set(); webRequest.BeginGetResponse(new AsyncCallback(this.GetResponseCallback), null); } void GetResponseCallback(IAsyncResult asynchronousResult) { HttpWebResponse response = (HttpWebResponse)webRequest.EndGetResponse(asynchronousResult); Stream streamResponse = response.GetResponseStream(); Dim.Ensure(streamResponse.CanRead); byte[] readData = new byte[streamResponse.Length]; Dim.Ensure(streamResponse.Read(readData, 0, (int)streamResponse.Length) == streamResponse.Length); streamResponse.Close(); response.Close(); webRequest = null; responseArrivedEvent.Set(); responseArrivedCallback(requestContext, new BinaryDataBuffer(readData)); } HttpWebRequest webRequest; ManualResetEvent requestSentEvent; BinaryDataBuffer requestMsg; object requestContext; ManualResetEvent responseArrivedEvent; ResponseArrivedCallback responseArrivedCallback; } I use this code to send data back and forth to an HTTP server.

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• Flash -> ByteArray -> AMFPHP -> Invalid Image !??

  - by undefined

  Hi, Im loading images into Flash and using JPGEncoder to encode the image to a ByteArray and send this to AMF PHP which writes out the bytearray to a file. This all appears to work correctly and I can download the resulting file in Photoshop CS4 absolutely fine. When i try to open it from the desktop or open it back in Flash it doesnt work... Picasa my default image browser says "Invalid" Here is the code i use to write the bytearray to a file - $jpg = $GLOBALS["HTTP_RAW_POST_DATA"]; file_put_contents($filename, $jpg); That's it ... I use the NetConnection class to connect and call the service, do I need to say Im sending jpg data? I assumed that JPGEncoder took care of that. How can I validate the bytearray before writing the file? Do I need to set MIME type or something .. excuse the slightly noob questions, a little knowledge can be a dangerous thing. Thanks --------------------------------------- PART II ------------------------------------------ Here is some code - 1) load the image into Flash player item.load(); function _onImageDataLoaded(evt:Event):void { var tmpFileRef:FileReference=FileReference(evt.target); image_loader=new Loader ; image_loader.contentLoaderInfo.addEventListener(Event.COMPLETE, _onImageLoaded); image_loader.loadBytes(tmpFileRef.data); } function _onImageLoaded(evt:Event):void { bitmap=Bitmap(evt.target.content); bitmap.smoothing=true; if (bitmap.width>MAX_WIDTH||bitmap.height>MAX_HEIGHT) { resizeBitmap(bitmap); } uploadResizedImage(bitmap); } function resizeBitmap(target:Bitmap):void { if (target.height>target.width) { target.width=MAX_WIDTH; target.scaleY=target.scaleX; } else if (target.width >= target.height) { target.height=MAX_HEIGHT; target.scaleX=target.scaleY; } } function uploadResizedImage(target:Bitmap):void { var _bmd:BitmapData=new BitmapData(target.width,target.height); _bmd.draw(target, new Matrix(target.scaleX, 0, 0, target.scaleY)); var encoded_jpg:JPGEncoder=new JPGEncoder(90); var jpg_binary:ByteArray=encoded_jpg.encode(_bmd); _uploadService=new NetConnection(); _uploadService.objectEncoding=ObjectEncoding.AMF3 _uploadService.connect("http://.../amfphp/gateway.php"); _uploadService.call("UploadService.receiveByteArray",new Responder(success, error), jpg_binary, currentImageFilename); } Many thanks for you help

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• creating objects from trivial graph format text file. java. dijkstra algorithm.

  - by user560084

  i want to create objects, vertex and edge, from trivial graph format txt file. one of programmers here suggested that i use trivial graph format to store data for dijkstra algorithm. the problem is that at the moment all the information, e.g., weight, links, is in the sourcecode. i want to have a separate text file for that and read it into the program. i thought about using a code for scanning through the text file by using scanner. but i am not quite sure how to create different objects from the same file. could i have some help please? the file is v0 Harrisburg v1 Baltimore v2 Washington v3 Philadelphia v4 Binghamton v5 Allentown v6 New York # v0 v1 79.83 v0 v5 81.15 v1 v0 79.75 v1 v2 39.42 v1 v3 103.00 v2 v1 38.65 v3 v1 102.53 v3 v5 61.44 v3 v6 96.79 v4 v5 133.04 v5 v0 81.77 v5 v3 62.05 v5 v4 134.47 v5 v6 91.63 v6 v3 97.24 v6 v5 87.94 and the dijkstra algorithm code is Downloaded from: http://en.literateprograms.org/Special:Downloadcode/Dijkstra%27s_algorithm_%28Java%29 */ import java.util.PriorityQueue; import java.util.List; import java.util.ArrayList; import java.util.Collections; class Vertex implements Comparable<Vertex> { public final String name; public Edge[] adjacencies; public double minDistance = Double.POSITIVE_INFINITY; public Vertex previous; public Vertex(String argName) { name = argName; } public String toString() { return name; } public int compareTo(Vertex other) { return Double.compare(minDistance, other.minDistance); } } class Edge { public final Vertex target; public final double weight; public Edge(Vertex argTarget, double argWeight) { target = argTarget; weight = argWeight; } } public class Dijkstra { public static void computePaths(Vertex source) { source.minDistance = 0.; PriorityQueue<Vertex> vertexQueue = new PriorityQueue<Vertex>(); vertexQueue.add(source); while (!vertexQueue.isEmpty()) { Vertex u = vertexQueue.poll(); // Visit each edge exiting u for (Edge e : u.adjacencies) { Vertex v = e.target; double weight = e.weight; double distanceThroughU = u.minDistance + weight; if (distanceThroughU < v.minDistance) { vertexQueue.remove(v); v.minDistance = distanceThroughU ; v.previous = u; vertexQueue.add(v); } } } } public static List<Vertex> getShortestPathTo(Vertex target) { List<Vertex> path = new ArrayList<Vertex>(); for (Vertex vertex = target; vertex != null; vertex = vertex.previous) path.add(vertex); Collections.reverse(path); return path; } public static void main(String[] args) { Vertex v0 = new Vertex("Nottinghill_Gate"); Vertex v1 = new Vertex("High_Street_kensignton"); Vertex v2 = new Vertex("Glouchester_Road"); Vertex v3 = new Vertex("South_Kensignton"); Vertex v4 = new Vertex("Sloane_Square"); Vertex v5 = new Vertex("Victoria"); Vertex v6 = new Vertex("Westminster"); v0.adjacencies = new Edge[]{new Edge(v1, 79.83), new Edge(v6, 97.24)}; v1.adjacencies = new Edge[]{new Edge(v2, 39.42), new Edge(v0, 79.83)}; v2.adjacencies = new Edge[]{new Edge(v3, 38.65), new Edge(v1, 39.42)}; v3.adjacencies = new Edge[]{new Edge(v4, 102.53), new Edge(v2, 38.65)}; v4.adjacencies = new Edge[]{new Edge(v5, 133.04), new Edge(v3, 102.53)}; v5.adjacencies = new Edge[]{new Edge(v6, 81.77), new Edge(v4, 133.04)}; v6.adjacencies = new Edge[]{new Edge(v0, 97.24), new Edge(v5, 81.77)}; Vertex[] vertices = { v0, v1, v2, v3, v4, v5, v6 }; computePaths(v0); for (Vertex v : vertices) { System.out.println("Distance to " + v + ": " + v.minDistance); List<Vertex> path = getShortestPathTo(v); System.out.println("Path: " + path); } } } and the code for scanning file is import java.util.Scanner; import java.io.File; import java.io.FileNotFoundException; public class DataScanner1 { //private int total = 0; //private int distance = 0; private String vector; private String stations; private double [] Edge = new double []; /*public int getTotal(){ return total; } */ /* public void getMenuInput(){ KeyboardInput in = new KeyboardInput; System.out.println("Enter the destination? "); String val = in.readString(); return val; } */ public void readFile(String fileName) { try { Scanner scanner = new Scanner(new File(fileName)); scanner.useDelimiter (System.getProperty("line.separator")); while (scanner.hasNext()) { parseLine(scanner.next()); } scanner.close(); } catch (FileNotFoundException e) { e.printStackTrace(); } } public void parseLine(String line) { Scanner lineScanner = new Scanner(line); lineScanner.useDelimiter("\\s*,\\s*"); vector = lineScanner.next(); stations = lineScanner.next(); System.out.println("The current station is " + vector + " and the destination to the next station is " + stations + "."); //total += distance; //System.out.println("The total distance is " + total); } public static void main(String[] args) { /* if (args.length != 1) { System.err.println("usage: java TextScanner2" + "file location"); System.exit(0); } */ DataScanner1 scanner = new DataScanner1(); scanner.readFile(args[0]); //int total =+ distance; //System.out.println(""); //System.out.println("The total distance is " + scanner.getTotal()); } }

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• Is dealloc method called in presentModalViewController when dismiss the controller.

  - by Madan Mohan

  Hi Guys, here the following code is used to view the present modal view controller. [[self navigationController] presentModalViewController:doctorListViewNavigationController animated:YES]; code for dismiss the ModalViewController. -(void)closeAction { [[self navigationController] dismissModalViewControllerAnimated:YES]; } My problem is the dealloc method is not called then I am getting memory issue problems like object allocations, leaks.. (void)dealloc { [doctorList release]; [myTableView release]; [super dealloc]; }

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• UITabBarController rotation problem with popViewControllerAnimated and selectedIndex (iPhone SDK)

  - by rjobidon

  Hi! This is a very important auto rotate issue and easy to reproduce. My application has a UITabBarController. Each tab is a UINavigationController. Auto rotation is handled with normal calls to shouldAutorotateToInterfaceOrientation and didRotateFromInterfaceOrientation. The interface rotates normally until I call UIViewController.popViewControllerAnimated and change UITabBarController.selectedIndex. Steps to reproduce: Create a demo Tab Bar Application. Add the following code to the App Delegate .h file: #import <UIKit/UIKit.h> @interface TestRotationAppDelegate : NSObject { UIWindow *window; UITabBarController *tabBarController; } @property (nonatomic, retain) IBOutlet UIWindow *window; @property (nonatomic, retain) IBOutlet UITabBarController *tabBarController; -(void)doAction; @end // Redefine the interface to cach rotation messages @interface UITabBarController (TestRotation1AppDelegate) @end Add the following code to the App Delegate .m file: #import "TestRotationAppDelegate.h" @implementation TestRotationAppDelegate @synthesize window; @synthesize tabBarController; -(BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { [window addSubview:tabBarController.view]; [window makeKeyAndVisible]; return YES; } -(BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation { return YES; } -(void)dealloc { [tabBarController release]; [window release]; [super dealloc]; } @end @implementation UITabBarController (TestRotation1AppDelegate) -(void)viewDidLoad { [super viewDidLoad]; // Add a third tab and push a view UIViewController *view1 = [[UIViewController alloc] init]; view1.title = @"Third"; UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:view1]; NSMutableArray *array = [[NSMutableArray alloc] init]; [array addObjectsFromArray:self.viewControllers]; [array addObject:nav]; self.viewControllers = array; // Push view2 inside the third tab UIViewController *view2 = [[UIViewController alloc] init]; [nav pushViewController:view2 animated:YES]; // Create a button to pop view2 UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect]; button.frame = CGRectMake(50, 50, 220, 38); [button setTitle:@"Pop this view" forState:UIControlStateNormal]; [button addTarget:self action:@selector(doAction) forControlEvents:UIControlEventTouchUpInside]; [view2.view addSubview:button]; } -(void) doAction { // ROTATION PROBLEM BEGINS HERE // Remove one line of code and the problem doesn't occur. [self.selectedViewController popViewControllerAnimated:YES]; self.selectedIndex = 0; } -(BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation { return YES; } @end The interface auto rotates normally until you tap the button on tab #3. Your help will be geatly appreciated!

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• android service onBind SecurityException

  - by Metalex

  I don't know why but in some devices my service isn't allowed to bind. java.lang.RuntimeException: Unable to create application mypackage.MyApplication: java.lang.SecurityException: Unable to find app for caller android.app.ApplicationThreadProxy@41680e78 (pid=16805) when binding service Intent { cmp=mypackage/.MyService } at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4394) at android.app.ActivityThread.access$1300(ActivityThread.java:141) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1294) at android.os.Handler.dispatchMessage(Handler.java:99) at android.os.Looper.loop(Looper.java:137) at android.app.ActivityThread.main(ActivityThread.java:5039) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:511) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) at dalvik.system.NativeStart.main(Native Method) Caused by: java.lang.SecurityException: Unable to find app for caller android.app.ApplicationThreadProxy@41680e78 (pid=16805) when binding service Intent { cmp=mypackage/.MyService } at android.os.Parcel.readException(Parcel.java:1425) at android.os.Parcel.readException(Parcel.java:1379) at android.app.ActivityManagerProxy.bindService(ActivityManagerNative.java:2720) at android.app.ContextImpl.bindService(ContextImpl.java:1431) at android.app.ContextImpl.bindService(ContextImpl.java:1407) at android.content.ContextWrapper.bindService(ContextWrapper.java:473) at mypackage.MyApplication.openService(MyApplication.java:151) at mypackage.MyApplication.onCreate(MyApplication.java:110) at android.app.Instrumentation.callApplicationOnCreate(Instrumentation.java:1000) at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4391) ... 10 more java.lang.SecurityException: Unable to find app for caller android.app.ApplicationThreadProxy@41680e78 (pid=16805) when binding service Intent { cmp=mypackage/.MyService } at android.os.Parcel.readException(Parcel.java:1425) at android.os.Parcel.readException(Parcel.java:1379) at android.app.ActivityManagerProxy.bindService(ActivityManagerNative.java:2720) at android.app.ContextImpl.bindService(ContextImpl.java:1431) at android.app.ContextImpl.bindService(ContextImpl.java:1407) at android.content.ContextWrapper.bindService(ContextWrapper.java:473) at mypackage.MyApplication.openService(MyApplication.java:151) at mypackage.MyApplication.onCreate(MyApplication.java:110) at android.app.Instrumentation.callApplicationOnCreate(Instrumentation.java:1000) at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4391) at android.app.ActivityThread.access$1300(ActivityThread.java:141) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1294) at android.os.Handler.dispatchMessage(Handler.java:99) at android.os.Looper.loop(Looper.java:137) at android.app.ActivityThread.main(ActivityThread.java:5039) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:511) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) at dalvik.system.NativeStart.main(Native Method) Code from MyApplication: @Override public void onCreate() { super.onCreate(); openService(); } public void openService() { Intent service = new Intent(this, MyService.class); mConnection = new ServiceConnection() { @Override public void onServiceConnected(ComponentName name, IBinder service) { mService = IMyService.Stub.asInterface(service); if (mListener != null) { mListener.onServiceStarted(mService); } } @Override public void onServiceDisconnected(ComponentName cn) { mService = null; } }; bindService(service, mConnection, Context.BIND_AUTO_CREATE); // 151 line } Please help me! Thank you!

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• How to login to wordpress programmatically?

  - by T-Rex

  I need to perform some action in wordpress admin panel programmatically but can't manage how to login to Wordpress using C# and HttpWebRequest. Here is what I do: private void button1_Click(object sender, EventArgs e) { string url = "http://localhost/wordpress/wp-login.php"; HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url); CookieContainer cookies = new CookieContainer(); SetupRequest(url, request, cookies); //request.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8"; //request.Headers["Accept-Language"] = "uk,ru;q=0.8,en-us;q=0.5,en;q=0.3"; //request.Headers["Accept-Encoding"] = "gzip,deflate"; //request.Headers["Accept-Charset"] = "windows-1251,utf-8;q=0.7,*;q=0.7"; string user = "test"; string pwd = "test"; request.Credentials = new NetworkCredential(user, pwd); string data = string.Format( "log={0}&pwd={1}&wp-submit={2}&testcookie=1&redirect_to={3}", user, pwd, System.Web.HttpUtility.UrlEncode("Log In"), System.Web.HttpUtility.UrlEncode("http://localhost/wordpress/wp-admin/")); SetRequestData(request, data); ShowResponse(request); } private static void SetupRequest(string url, HttpWebRequest request, CookieContainer cookies) { request.CookieContainer = cookies; request.UserAgent = "Mozilla/5.0 (Windows; U; Windows NT 6.0; uk; rv:1.9.1.2) Gecko/20090729 Firefox/3.5.2 (.NET CLR 3.5.30729)"; request.KeepAlive = true; request.Timeout = 120000; request.Method = "POST"; request.Referer = url; request.ContentType = "application/x-www-form-urlencoded"; } private void ShowResponse(HttpWebRequest request) { HttpWebResponse response = (HttpWebResponse)request.GetResponse(); responseTextBox.Text = (((HttpWebResponse)response).StatusDescription); responseTextBox.Text += "\r\n"; StreamReader reader = new StreamReader(response.GetResponseStream()); responseTextBox.Text += reader.ReadToEnd(); } private static void SetRequestData(HttpWebRequest request, string data) { byte[] streamData = Encoding.ASCII.GetBytes(data); request.ContentLength = streamData.Length; Stream dataStream = request.GetRequestStream(); dataStream.Write(streamData, 0, streamData.Length); dataStream.Close(); } But unfortunately in responce I get only HTML source code of login page and it seems that cookies don't contain session ID. All requests which I perform after that code also return HTML source of login page so I can assume that it does not login correctly. Can anybody help me to solve that problem or give working example? Main thing which I want to achieve is scanning for new images in Nextgen Gallery plugin for Wordpress. Is there XML-RPC way of doing that? Thanks in advance.

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• TI MSP430 Interrupt source

  - by TheDelChop

  Guys, I know that when working with the MSP430F2619 and TI's CCSv4, I can get more than one interrupt to use the same interrupt handler with code that looks something like this: #pragma vector=TIMERA1_VECTOR #pragma vector=TIMERA0_VECTOR __interrupt void Timer_A (void){ ServiceWatchdogTimer(); } My question is, when I find myself in that interrupt, is there a way to figure out which one of these interrupts got me here? Thank you, Joe

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• Rx framework: How to wait for an event to be triggered in silverlight test

  - by user324255

  Hi, I have a ViewModel that starts loading the Model async in the constructor, and triggers an event when the Model is loaded. I got a test working with the silverlight unit test framework, like this : bool done = false; [TestMethod] [Asynchronous] public void Test_NoCustomerSelected() { ProjectListViewModel viewModel = null; EnqueueCallback(() => viewModel = new ProjectListViewModel()); EnqueueCallback(() => viewModel.ModelLoaded += new EventHandler<EventArgs>(viewModel_ModelLoaded)); EnqueueConditional(() => done); EnqueueCallback(() => Assert.IsNotNull(viewModel.FilteredProjectList)); EnqueueCallback(() => Assert.AreEqual(4, viewModel.FilteredProjectList.Count)); EnqueueTestComplete(); } void viewModel_ModelLoaded(object sender, EventArgs e) { done = true; } But I'm beginning playing with Rx Framework, and trying to get my test to work, but so far I have no luck. Here's 2 attempts : public void Test_NoCustomerSelected2() { ProjectListViewModel viewModel = null; viewModel = new ProjectListViewModel(eventAggregatorMock.Object, moduleManagerMock.Object); IObservable<IEvent<EventArgs>> eventAsObservable = Observable.FromEvent<EventArgs>( ev => viewModel.ModelLoaded += ev, ev => viewModel.ModelLoaded -= ev); eventAsObservable.Subscribe(args => viewModel_ModelLoaded(args.Sender, args.EventArgs)); eventAsObservable.First(); Assert.IsNotNull(viewModel.Model); Assert.AreEqual(4, viewModel.Model.Count); } [TestMethod] public void Test_NoCustomerSelected3() { ProjectListViewModel viewModel = null; var o = Observable.Start(() => viewModel = new ProjectListViewModel(eventAggregatorMock.Object, moduleManagerMock.Object)); IObservable<IEvent<EventArgs>> eventAsObservable = Observable.FromEvent<EventArgs>( ev => viewModel.ModelLoaded += ev, ev => viewModel.ModelLoaded -= ev); o.TakeUntil(eventAsObservable) .First(); Assert.IsNotNull(viewModel.Model); Assert.AreEqual(4, viewModel.Model.Count); } The first test goes in waiting forever, the second doesn't work because the viewModel is null when it does the FromEvent. Anyone has a clue on how to do this properly?

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• Core Data error when assigning variable with one-to-one relationship

  - by Hoang Pham

  I tried to assign a managed object (C) with its property another managed object (B) (a one-to-one relationship) in which this other managed object (B) has a to-many relationship with one other managed object (A). There is an error from this assignment in which I copied as follows: #0 0x020e53a7 in ___forwarding___ #1 0x020c16c2 in __forwarding_prep_0___ #2 0x02078988 in CFRetain #3 0x0207a728 in CFSetAddValue #4 0x020c2fb2 in CFSetCreate #5 0x01e51ce8 in -[_NSFaultingMutableSet copyWithZone:] #6 0x020afcca in -[NSObject copy] #7 0x01e50d22 in -[NSManagedObject(_NSInternalMethods) _newPropertiesForRetainedTypes:andCopiedTypes:preserveFaults:] #8 0x01e51aa0 in -[NSManagedObject(_NSInternalMethods) _newAllPropertiesWithRelationshipFaultsIntact__] #9 0x01e519b4 in -[NSManagedObjectContext(_NSInternalChangeProcessing) _establishEventSnapshotsForObject:] #10 0x01e51866 in _PFFastMOCObjectWillChange #11 0x01e516c5 in _PF_ManagedObject_WillChangeValueForKeyIndex #12 0x01e51525 in _sharedIMPL_setvfk_core #13 0x01e51483 in _PF_Handler_Public_SetProperty #14 0x01e546d1 in -[NSManagedObject(_NSInternalMethods) _didChangeValue:forRelationship:named:withInverse:] #15 0x0030ec1e in NSKVONotify #16 0x002aae2a in -[NSObject(NSKeyValueObserverNotification) didChangeValueForKey:] #17 0x01e5212f in _PF_ManagedObject_DidChangeValueForKeyIndex #18 0x01e515b1 in _sharedIMPL_setvfk_core #19 0x01e55827 in _svfk_5 I don't understand very well what the exact description of this error is. Can someone explain to me what it is and how to solve this one. Note that all other assignments in which the managed object B does not have any A items do not raise this error. ObjectC *objectC = [NSEntityDescription insertNewObjectForEntityForName:@"ObjectC" inManagedObjectContext:managedObjectContext]; objectC.objectB = objectB; Thank you in advance. I added some more NSZombieEnabled/MallocStackLogging generated log: 2010-05-18 17:28:05.327 Foo[2069:207] *** -[CFSet retain]: message sent to deallocated instance 0x800c880 (gdb) shell malloc_history 207 0x800c880 malloc_history cannot examine process 207 because the process does not exist. (gdb) shell malloc_history 2069 0x800c880 ALLOC 0x800c880-0x800c884 [size=5]: thread_a0a8c4e0 |start | main | UIApplicationMain | GSEventRun | GSEventRunModal | CFRunLoopRunInMode | CFRunLoopRunSpecific | __NSFireDelayedPerform | -[Step2ViewController downloadData] | -[Parser downloadVariantsWithPin:forTerminal:] | -[Parser parseByNSXMLParser:] | -[NSXMLParser parse] | xmlParseChunk | xmlIOParseDTD | _endElementNs | -[Parser parser:didEndElement:namespaceURI:qualifiedName:] | NSLog | NSLogv | _CFLogvEx | __CFLogCString | asl_send | _asl_send_level_message | asl_set_query | strdup | malloc | malloc_zone_malloc ---- FREE 0x800c880-0x800c884 [size=5]: thread_a0a8c4e0 |start | main | UIApplicationMain | GSEventRun | GSEventRunModal | CFRunLoopRunInMode | CFRunLoopRunSpecific | __NSFireDelayedPerform | -[Step2ViewController downloadData] | -[Parser downloadVariantsWithPin:forTerminal:] | -[Parser parseByNSXMLParser:] | -[NSXMLParser parse] | xmlParseChunk | xmlIOParseDTD | _endElementNs | -[Parser parser:didEndElement:namespaceURI:qualifiedName:] | NSLog | NSLogv | _CFLogvEx | __CFLogCString | asl_send | _asl_send_level_message | asl_free | free ALLOC 0x800c860-0x800c8df [size=128]: thread_a0a8c4e0 |start | main | UIApplicationMain | GSEventRun | GSEventRunModal | CFRunLoopRunInMode | CFRunLoopRunSpecific | __NSFireDelayedPerform | -[Step2ViewController downloadData] | -[Parser downloadVariantsWithPin:forTerminal:] | -[Parser parseByNSXMLParser:] | -[NSXMLParser parse] | xmlParseChunk | xmlParseCharData | _characters | -[Parser parser:foundCharacters:] | NSLog | NSLogv | _CFLogvEx | __CFLogCString | asl_send | _asl_send_level_message | asl_set_query | asprintf | malloc | malloc_zone_malloc ---- FREE 0x800c860-0x800c8df [size=128]: thread_a0a8c4e0 |start | main | UIApplicationMain | GSEventRun | GSEventRunModal | CFRunLoopRunInMode | CFRunLoopRunSpecific | __NSFireDelayedPerform | -[Step2ViewController downloadData] | -[Parser downloadVariantsWithPin:forTerminal:] | -[Parser parseByNSXMLParser:] | -[NSXMLParser parse] | xmlParseChunk | xmlParseCharData | _characters | -[Parser parser:foundCharacters:] | NSLog | NSLogv | _CFLogvEx | __CFLogCString | asl_send | _asl_send_level_message | asl_set_query | free ALLOC 0x800c860-0x800c8df [size=128]: thread_a0a8c4e0 |start | main | UIApplicationMain | GSEventRun | GSEventRunModal | CFRunLoopRunInMode | CFRunLoopRunSpecific | __NSFireDelayedPerform | -[Step2ViewController downloadData] | -[Parser downloadVariantsWithPin:forTerminal:] | -[Parser parseByNSXMLParser:] | -[NSXMLParser parse] | xmlParseChunk | xmlParseCharData | _characters | -[Parser parser:foundCharacters:] | NSLog | NSLogv | _CFLogvEx | __CFLogCString | asl_send | _asl_send_level_message | asprintf | malloc | malloc_zone_malloc ---- FREE 0x800c860-0x800c8df [size=128]: thread_a0a8c4e0 |start | main | UIApplicationMain | GSEventRun | GSEventRunModal | CFRunLoopRunInMode | CFRunLoopRunSpecific | __NSFireDelayedPerform | -[Step2ViewController downloadData] | -[Parser downloadVariantsWithPin:forTerminal:] | -[Parser parseByNSXMLParser:] | -[NSXMLParser parse] | xmlParseChunk | xmlParseCharData | _characters | -[Parser parser:foundCharacters:] | NSLog | NSLogv | _CFLogvEx | __CFLogCString | asl_send | _asl_send_level_message | free ALLOC 0x800c860-0x800c8df [size=128]: thread_a0a8c4e0 |start | main | UIApplicationMain | GSEventRun | GSEventRunModal | CFRunLoopRunInMode | CFRunLoopRunSpecific | __NSFireDelayedPerform | -[Step2ViewController downloadData] | -[Parser downloadVariantsWithPin:forTerminal:] | -[Parser parseByNSXMLParser:] | -[NSXMLParser parse] | xmlParseChunk | xmlParseCharData | _characters | -[Parser parser:foundCharacters:] | NSLog | NSLogv | _CFLogvEx | __CFLogCString | asl_send | _asl_send_level_message | asprintf | malloc | malloc_zone_malloc ---- FREE 0x800c860-0x800c8df [size=128]: thread_a0a8c4e0 |start | main | UIApplicationMain | GSEventRun | GSEventRunModal | CFRunLoopRunInMode | CFRunLoopRunSpecific | __NSFireDelayedPerform | -[Step2ViewController downloadData] | -[Parser downloadVariantsWithPin:forTerminal:] | -[Parser parseByNSXMLParser:] | -[NSXMLParser parse] | xmlParseChunk | xmlParseCharData | _characters | -[Parser parser:foundCharacters:] | NSLog | NSLogv | _CFLogvEx | __CFLogCString | asl_send | _asl_send_level_message | free ALLOC 0x800c860-0x800c8df [size=128]: thread_a0a8c4e0 |start | main | UIApplicationMain | GSEventRun | GSEventRunModal | CFRunLoopRunInMode | CFRunLoopRunSpecific | __NSFireDelayedPerform | -[Step2ViewController downloadData] | -[Parser downloadVariantsWithPin:forTerminal:] | -[Parser parseByNSXMLParser:] | -[NSXMLParser parse] | xmlParseChunk | xmlParseCharData | _characters | -[Parser parser:foundCharacters:] | NSLog | NSLogv | _CFLogvEx | __CFLogCString | asl_send | _asl_send_level_message | asprintf | malloc | malloc_zone_malloc ---- FREE 0x800c860-0x800c8df [size=128]: thread_a0a8c4e0 |start | main | UIApplicationMain | GSEventRun | GSEventRunModal | CFRunLoopRunInMode | CFRunLoopRunSpecific | __NSFireDelayedPerform | -[Step2ViewController downloadData] | -[Parser downloadVariantsWithPin:forTerminal:] | -[Parser parseByNSXMLParser:] | -[NSXMLParser parse] | xmlParseChunk | xmlParseCharData | _characters | -[Parser parser:foundCharacters:] | NSLog | NSLogv | _CFLogvEx | __CFLogCString | asl_send | _asl_send_level_message | free ALLOC 0x800c860-0x800c8df [size=128]: thread_a0a8c4e0 |start | main | UIApplicationMain | GSEventRun | GSEventRunModal | CFRunLoopRunInMode | CFRunLoopRunSpecific | __NSFireDelayedPerform | -[Step2ViewController downloadData] | -[Parser downloadVariantsWithPin:forTerminal:] | -[Parser parseByNSXMLParser:] | -[NSXMLParser parse] | xmlParseChunk | xmlParseCharData | _characters | -[Parser parser:foundCharacters:] | NSLog | NSLogv | _CFLogvEx | __CFLogCString | asl_send | _asl_send_level_message | asprintf | malloc | malloc_zone_malloc ---- FREE 0x800c860-0x800c8df [size=128]: thread_a0a8c4e0 |start | main | UIApplicationMain | GSEventRun | GSEventRunModal | CFRunLoopRunInMode | CFRunLoopRunSpecific | __NSFireDelayedPerform | -[Step2ViewController downloadData] | -[Parser downloadVariantsWithPin:forTerminal:] | -[Parser parseByNSXMLParser:] | -[NSXMLParser parse] | xmlParseChunk | xmlParseCharData | _characters | -[Parser parser:foundCharacters:] | NSLog | NSLogv | _CFLogvEx | __CFLogCString | asl_send | _asl_send_level_message | free ALLOC 0x800c860-0x800c8df [size=128]: thread_a0a8c4e0 |start | main | UIApplicationMain | GSEventRun | GSEventRunModal | CFRunLoopRunInMode | CFRunLoopRunSpecific | __NSFireDelayedPerform | -[Step2ViewController downloadData] | -[Parser downloadVariantsWithPin:forTerminal:] | -[Parser parseByNSXMLParser:] | -[NSXMLParser parse] | xmlParseChunk | xmlParseCharData | _characters | -[Parser parser:foundCharacters:] | NSLog | NSLogv | _CFLogvEx | __CFLogCString | asl_send | _asl_send_level_message | asprintf | malloc | malloc_zone_malloc ---- FREE 0x800c860-0x800c8df [size=128]: thread_a0a8c4e0 |start | main | UIApplicationMain | GSEventRun | GSEventRunModal | CFRunLoopRunInMode | CFRunLoopRunSpecific | __NSFireDelayedPerform | -[Step2ViewController downloadData] | -[Parser downloadVariantsWithPin:forTerminal:] | -[Parser parseByNSXMLParser:] | -[NSXMLParser parse] | xmlParseChunk | xmlParseCharData | _characters | -[Parser parser:foundCharacters:] | NSLog | NSLogv | _CFLogvEx | __CFLogCString | asl_send | _asl_send_level_message | free ALLOC 0x800c700-0x800c893 [size=404]: thread_a0a8c4e0 |start | main | UIApplicationMain | GSEventRun | GSEventRunModal | CFRunLoopRunInMode | CFRunLoopRunSpecific | __NSFireDelayedPerform | -[Step2ViewController downloadData] | -[Parser downloadVariantsWithPin:forTerminal:] | -[Parser parseByNSXMLParser:] | -[NSXMLParser parse] | xmlParseChunk | xmlIOParseDTD | _startElementNs | -[Parser parser:didStartElement:namespaceURI:qualifiedName:attributes:] | NSLog | NSLogv | _CFLogvEx | __CFLogCString | CFCalendarDecomposeAbsoluteTime | _CFCalendarDecomposeAbsoluteTimeV | __CFCalendarSetupCal | __CFCalendarCreateUCalendar | ucal_open | icu::Calendar::createInstance(icu::TimeZone*, icu::Locale const&, UErrorCode&) | malloc | malloc_zone_malloc ---- FREE 0x800c700-0x800c893 [size=404]: thread_a0a8c4e0 |start | main | UIApplicationMain | GSEventRun | GSEventRunModal | CFRunLoopRunInMode | CFRunLoopRunSpecific | __NSFireDelayedPerform | -[Step2ViewController downloadData] | -[Parser downloadVariantsWithPin:forTerminal:] | -[Parser parseByNSXMLParser:] | -[NSXMLParser parse] | xmlParseChunk | xmlIOParseDTD | _startElementNs | -[Parser parser:didStartElement:namespaceURI:qualifiedName:attributes:] | NSLog | NSLogv | _CFLogvEx | __CFLogCString | _CFRelease | free ALLOC 0x800c880-0x800c8c7 [size=72]: thread_a0a8c4e0 |start | main | UIApplicationMain | GSEventRun | GSEventRunModal | CFRunLoopRunInMode | CFRunLoopRunSpecific | __NSFireDelayedPerform | -[Step2ViewController downloadData] | -[Parser downloadVariantsWithPin:forTerminal:] | -[Parser parseByNSXMLParser:] | -[NSXMLParser parse] | xmlParseChunk | xmlIOParseDTD | _startElementNs | -[Parser parser:didStartElement:namespaceURI:qualifiedName:attributes:] | +[NSEntityDescription insertNewObjectForEntityForName:inManagedObjectContext:] | +[NSManagedObject(_PFDynamicAccessorsAndPropertySupport) allocWithEntity:] | _PFAllocateObject | malloc_zone_calloc ---- FREE 0x800c880-0x800c8c7 [size=72]: thread_a0a8c4e0 |start | main | UIApplicationMain | GSEventRun | GSEventRunModal | CFRunLoopRunInMode | CFRunLoopRunSpecific | __CFRunLoopDoObservers | _performRunLoopAction | -[_PFManagedObjectReferenceQueue _processReferenceQueue:] | _PFDeallocateObject | malloc_zone_free ALLOC 0x800c880-0x800c8a7 [size=40]: thread_a0a8c4e0 |start | main | UIApplicationMain | GSEventRun | GSEventRunModal | CFRunLoopRunInMode | CFRunLoopRunSpecific | __CFRunLoopDoObservers | CA::Transaction::observer_callback(__CFRunLoopObserver*, unsigned long, void*) | CA::Transaction::commit() | CA::Context::commit_transaction(CA::Transaction*) | CALayerDisplayIfNeeded | -[TileLayer display] | -[CALayer _display] | CABackingStoreUpdate | backing_callback(CGContext*, void*) | WebCore::TiledSurface::drawLayer(CALayer*, CGContext*) | WKWindowDrawRect | WKViewDisplayRect | _WKViewDraw(CGContext*, WKView*, CGRect) | _WKViewDraw(CGContext*, WKView*, CGRect) | _WKViewDraw(CGContext*, WKView*, CGRect) | _WKViewDraw(CGContext*, WKView*, CGRect) | _WKViewDraw(CGContext*, WKView*, CGRect) | -[WebHTMLView drawSingleRect:] | -[WebFrame(WebInternal) _drawRect:contentsOnly:] | WebCore::FrameView::paintContents(WebCore::GraphicsContext*, WebCore::IntRect const&) | WebCore::RenderLayer::paint(WebCore::GraphicsContext*, WebCore::IntRect const&, WebCore::PaintRestriction, WebCore::RenderObject*) | WebCore::RenderLayer::paintLayer(WebCore::RenderLayer*, WebCore::GraphicsContext*, WebCore::IntRect const&, bool, WebCore::PaintRestriction, WebCore::RenderObject*, bool, bool) | WebCore::RenderLayer::paintLayer(WebCore::RenderLayer*, WebCore::GraphicsContext*, WebCore::IntRect const&, bool, WebCore::PaintRestriction, WebCore::RenderObject*, bool, bool) | WebCore::RenderBlock::paint(WebCore::RenderObject::PaintInfo&, int, int) | WebCore::RenderBlock::paintObject(WebCore::RenderObject::PaintInfo&, int, int) | WebCore::RenderBlock::paintChildren(WebCore::RenderObject::PaintInfo&, int, int) | WebCore::RenderBlock::paint(WebCore::RenderObject::PaintInfo&, int, int) | WebCore::RenderBlock::paintObject(WebCore::RenderObject::PaintInfo&, int, int) | WebCore::RenderBlock::paintChildren(WebCore::RenderObject::PaintInfo&, int, int) | WebCore::RenderBlock::paint(WebCore::RenderObject::PaintInfo&, int, int) | WebCore::RenderBlock::paintObject(WebCore::RenderObject::PaintInfo&, int, int) | WebCore::RenderBlock::paintChildren(WebCore::RenderObject::PaintInfo&, int, int) | WebCore::RenderBlock::paint(WebCore::RenderObject::PaintInfo&, int, int) | WebCore::RenderBlock::paintObject(WebCore::RenderObject::PaintInfo&, int, int) | WebCore::RenderFlow::paintLines(WebCore::RenderObject::PaintInfo&, int, int) | WebCore::RootInlineBox::paint(WebCore::RenderObject::PaintInfo&, int, int) | WebCore::InlineFlowBox::paint(WebCore::RenderObject::PaintInfo&, int, int) | WebCore::InlineTextBox::paint(WebCore::RenderObject::PaintInfo&, int, int) | WebCore::paintTextWithShadows(WebCore::GraphicsContext*, WebCore::Font const&, WebCore::TextRun const&, int, int, WebCore::IntPoint const&, int, int, int, int, WebCore::ShadowData*, bool) | WebCore::GraphicsContext::drawText(WebCore::Font const&, WebCore::TextRun const&, WebCore::IntPoint const&, int, int) | WebCore::Font::drawSimpleText(WebCore::GraphicsContext*, WebCore::TextRun const&, WebCore::FloatPoint const&, int, int) const | WebCore::Font::drawGlyphBuffer(WebCore::GraphicsContext*, WebCore::GlyphBuffer const&, WebCore::TextRun const&, WebCore::FloatPoint&) const | WebCore::Font::drawGlyphs(WebCore::GraphicsContext*, WebCore::SimpleFontData const*, WebCore::GlyphBuffer const&, int, int, WebCore::FloatPoint const&, bool) const | CGGStateSetFont | maybeCopyTextState | calloc | malloc_zone_calloc ---- FREE 0x800c880-0x800c8a7 [size=40]: thread_a0a8c4e0 |start | main | UIApplicationMain | GSEventRun | GSEventRunModal | CFRunLoopRunInMode | CFRunLoopRunSpecific | __CFRunLoopDoObservers | CA::Transaction::observer_callback(__CFRunLoopObserver*, unsigned long, void*) | CA::Transaction::commit() | CA::Context::commit_transaction(CA::Transaction*) | CALayerDisplayIfNeeded | -[TileLayer display] | -[CALayer _display] | CABackingStoreUpdate | backing_callback(CGContext*, void*) | WebCore::TiledSurface::drawLayer(CALayer*, CGContext*) | WKWindowDrawRect | WKViewDisplayRect | _WKViewDraw(CGContext*, WKView*, CGRect) | _WKViewDraw(CGContext*, WKView*, CGRect) | _WKViewDraw(CGContext*, WKView*, CGRect) | _WKViewDraw(CGContext*, WKView*, CGRect) | _WKViewDraw(CGContext*, WKView*, CGRect) | -[WebHTMLView drawSingleRect:] | -[WebFrame(WebInternal) _drawRect:contentsOnly:] | WebCore::FrameView::paintContents(WebCore::GraphicsContext*, WebCore::IntRect const&) | WebCore::RenderLayer::paint(WebCore::GraphicsContext*, WebCore::IntRect const&, WebCore::PaintRestriction, WebCore::RenderObject*) | WebCore::RenderLayer::paintLayer(WebCore::RenderLayer*, WebCore::GraphicsContext*, WebCore::IntRect const&, bool, WebCore::PaintRestriction, WebCore::RenderObject*, bool, bool) | WebCore::RenderLayer::paintLayer(WebCore::RenderLayer*, WebCore::GraphicsContext*, WebCore::IntRect const&, bool, WebCore::PaintRestriction, WebCore::RenderObject*, bool, bool) | WebCore::RenderBlock::paint(WebCore::RenderObject::PaintInfo&, int, int) | WebCore::RenderBlock::paintObject(WebCore::RenderObject::PaintInfo&, int, int) | WebCore::RenderBlock::paintChildren(WebCore::RenderObject::PaintInfo&, int, int) | WebCore::RenderBlock::paint(WebCore::RenderObject::PaintInfo&, int, int) | WebCore::RenderBlock::paintObject(WebCore::RenderObject::PaintInfo&, int, int) | WebCore::RenderBlock::paintChildren(WebCore::RenderObject::PaintInfo&, int, int) | WebCore::RenderBlock::paint(WebCore::RenderObject::PaintInfo&, int, int) | WebCore::RenderBlock::paintObject(WebCore::RenderObject::PaintInfo&, int, int) | WebCore::RenderBlock::paintChildren(WebCore::RenderObject::PaintInfo&, int, int) | WebCore::RenderBlock::paint(WebCore::RenderObject::PaintInfo&, int, int) | WebCore::RenderBlock::paintObject(WebCore::RenderObject::PaintInfo&, int, int) | WebCore::RenderFlow::paintLines(WebCore::RenderObject::PaintInfo&, int, int) | WebCore::RootInlineBox::paint(WebCore::RenderObject::PaintInfo&, int, int) | WebCore::InlineFlowBox::paint(WebCore::RenderObject::PaintInfo&, int, int) | WebCore::InlineTextBox::paint(WebCore::RenderObject::PaintInfo&, int, int) | WebCore::paintTextWithShadows(WebCore::GraphicsContext*, WebCore::Font const&, WebCore::TextRun const&, int, int, WebCore::IntPoint const&, int, int, int, int, WebCore::ShadowData*, bool) | WebCore::GraphicsContext::restorePlatformState() | CGContextRestoreGState | CGGStackRestore | CGGStateRelease | textStateRelease | free ALLOC 0x800c880-0x800c8bf [size=64]: thread_a0a8c4e0 |start | main | UIApplicationMain | GSEventRun | GSEventRunModal | CFRunLoopRunInMode | CFRunLoopRunSpecific | CA::timer_callback(__CFRunLoopTimer*, void*) | run_animation_callbacks(double, void*) | -[UIViewAnimationState animationDidStop:finished:] | -[UIViewAnimationState sendDelegateAnimationDidStop:finished:] | -[UINavigationTransitionView _navigationTransitionDidStop] | -[UIView(Hierarchy) removeFromSuperview] | -[UITextField resignFirstResponder] | -[UIFieldEditor resignFirstResponder] | -[UIKeyboardImpl setDelegate:] | -[UIKeyboardImpl setDelegate:force:] | -[UITextInteractionAssistant setGestureRecognizers] | -[UITextInteractionAssistant addTwoFingerRangedSelectRecognizer] | -[UILongPressGestureRecognizer initWithTarget:action:] | -[__NSPlaceholderSet init] | -[__NSPlaceholderSet initWithCapacity:] | __CFSetInit | _CFRuntimeCreateInstance | malloc_zone_malloc

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• Is this a good way to do a game loop for an iPhone game?

  - by Danny Tuppeny

  Hi all, I'm new to iPhone dev, but trying to build a 2D game. I was following a book, but the game loop it created basically said: function gameLoop update() render() sleep(1/30th second) gameLoop The reasoning was that this would run at 30fps. However, this seemed a little mental, because if my frame took 1/30th second, then it would run at 15fps (since it'll spend as much time sleeping as updating). So, I did some digging and found the CADisplayLink class which would sync calls to my gameLoop function to the refresh rate (or a fraction of it). I can't find many samples of it, so I'm posting here for a code review :-) It seems to work as expected, and it includes passing the elapsed (frame) time into the Update method so my logic can be framerate-independant (however I can't actually find in the docs what CADisplayLink would do if my frame took more than its allowed time to run - I'm hoping it just does its best to catch up, and doesn't crash!). // // GameAppDelegate.m // // Created by Danny Tuppeny on 10/03/2010. // Copyright Danny Tuppeny 2010. All rights reserved. // #import "GameAppDelegate.h" #import "GameViewController.h" #import "GameStates/gsSplash.h" @implementation GameAppDelegate @synthesize window; @synthesize viewController; - (void) applicationDidFinishLaunching:(UIApplication *)application { // Create an instance of the first GameState (Splash Screen) [self doStateChange:[gsSplash class]]; // Set up the game loop displayLink = [CADisplayLink displayLinkWithTarget:self selector:@selector(gameLoop)]; [displayLink setFrameInterval:2]; [displayLink addToRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode]; } - (void) gameLoop { // Calculate how long has passed since the previous frame CFTimeInterval currentFrameTime = [displayLink timestamp]; CFTimeInterval elapsed = 0; // For the first frame, we want to pass 0 (since we haven't elapsed any time), so only // calculate this in the case where we're not the first frame if (lastFrameTime != 0) { elapsed = currentFrameTime - lastFrameTime; } // Keep track of this frames time (so we can calculate this next time) lastFrameTime = currentFrameTime; NSLog([NSString stringWithFormat:@"%f", elapsed]); // Call update, passing the elapsed time in [((GameState*)viewController.view) Update:elapsed]; } - (void) doStateChange:(Class)state { // Remove the previous GameState if (viewController.view != nil) { [viewController.view removeFromSuperview]; [viewController.view release]; } // Create the new GameState viewController.view = [[state alloc] initWithFrame:CGRectMake(0, 0, IPHONE_WIDTH, IPHONE_HEIGHT) andManager:self]; // Now set as visible [window addSubview:viewController.view]; [window makeKeyAndVisible]; } - (void) dealloc { [viewController release]; [window release]; [super dealloc]; } @end Any feedback would be appreciated :-) PS. Bonus points if you can tell me why all the books use "viewController.view" but for everything else seem to use "[object name]" format. Why not [viewController view]?

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• Implementing an async "read all currently available data from stream" operation

  - by Jon

  I recently provided an answer to this question: C# - Realtime console output redirection. As often happens, explaining stuff (here "stuff" was how I tackled a similar problem) leads you to greater understanding and/or, as is the case here, "oops" moments. I realized that my solution, as implemented, has a bug. The bug has little practical importance, but it has an extremely large importance to me as a developer: I can't rest easy knowing that my code has the potential to blow up. Squashing the bug is the purpose of this question. I apologize for the long intro, so let's get dirty. I wanted to build a class that allows me to receive input from a console's standard output Stream. Console output streams are of type FileStream; the implementation can cast to that, if needed. There is also an associated StreamReader already present to leverage. There is only one thing I need to implement in this class to achieve my desired functionality: an async "read all the data available this moment" operation. Reading to the end of the stream is not viable because the stream will not end unless the process closes the console output handle, and it will not do that because it is interactive and expecting input before continuing. I will be using that hypothetical async operation to implement event-based notification, which will be more convenient for my callers. The public interface of the class is this: public class ConsoleAutomator { public event EventHandler<ConsoleOutputReadEventArgs> StandardOutputRead; public void StartSendingEvents(); public void StopSendingEvents(); } StartSendingEvents and StopSendingEvents do what they advertise; for the purposes of this discussion, we can assume that events are always being sent without loss of generality. The class uses these two fields internally: protected readonly StringBuilder inputAccumulator = new StringBuilder(); protected readonly byte[] buffer = new byte[256]; The functionality of the class is implemented in the methods below. To get the ball rolling: public void StartSendingEvents(); { this.stopAutomation = false; this.BeginReadAsync(); } To read data out of the Stream without blocking, and also without requiring a carriage return char, BeginRead is called: protected void BeginReadAsync() { if (!this.stopAutomation) { this.StandardOutput.BaseStream.BeginRead( this.buffer, 0, this.buffer.Length, this.ReadHappened, null); } } The challenging part: BeginRead requires using a buffer. This means that when reading from the stream, it is possible that the bytes available to read ("incoming chunk") are larger than the buffer. Remember that the goal here is to read all of the chunk and call event subscribers exactly once for each chunk. To this end, if the buffer is full after EndRead, we don't send its contents to subscribers immediately but instead append them to a StringBuilder. The contents of the StringBuilder are only sent back whenever there is no more to read from the stream. private void ReadHappened(IAsyncResult asyncResult) { var bytesRead = this.StandardOutput.BaseStream.EndRead(asyncResult); if (bytesRead == 0) { this.OnAutomationStopped(); return; } var input = this.StandardOutput.CurrentEncoding.GetString( this.buffer, 0, bytesRead); this.inputAccumulator.Append(input); if (bytesRead < this.buffer.Length) { this.OnInputRead(); // only send back if we 're sure we got it all } this.BeginReadAsync(); // continue "looping" with BeginRead } After any read which is not enough to fill the buffer (in which case we know that there was no more data to be read during the last read operation), all accumulated data is sent to the subscribers: private void OnInputRead() { var handler = this.StandardOutputRead; if (handler == null) { return; } handler(this, new ConsoleOutputReadEventArgs(this.inputAccumulator.ToString())); this.inputAccumulator.Clear(); } (I know that as long as there are no subscribers the data gets accumulated forever. This is a deliberate decision). The good This scheme works almost perfectly: Async functionality without spawning any threads Very convenient to the calling code (just subscribe to an event) Never more than one event for each time data is available to be read Is almost agnostic to the buffer size The bad That last almost is a very big one. Consider what happens when there is an incoming chunk with length exactly equal to the size of the buffer. The chunk will be read and buffered, but the event will not be triggered. This will be followed up by a BeginRead that expects to find more data belonging to the current chunk in order to send it back all in one piece, but... there will be no more data in the stream. In fact, as long as data is put into the stream in chunks with length exactly equal to the buffer size, the data will be buffered and the event will never be triggered. This scenario may be highly unlikely to occur in practice, especially since we can pick any number for the buffer size, but the problem is there. Solution? Unfortunately, after checking the available methods on FileStream and StreamReader, I can't find anything which lets me peek into the stream while also allowing async methods to be used on it. One "solution" would be to have a thread wait on a ManualResetEvent after the "buffer filled" condition is detected. If the event is not signaled (by the async callback) in a small amount of time, then more data from the stream will not be forthcoming and the data accumulated so far should be sent to subscribers. However, this introduces the need for another thread, requires thread synchronization, and is plain inelegant. Specifying a timeout for BeginRead would also suffice (call back into my code every now and then so I can check if there's data to be sent back; most of the time there will not be anything to do, so I expect the performance hit to be negligible). But it looks like timeouts are not supported in FileStream. Since I imagine that async calls with timeouts are an option in bare Win32, another approach might be to PInvoke the hell out of the problem. But this is also undesirable as it will introduce complexity and simply be a pain to code. Is there an elegant way to get around the problem? Thanks for being patient enough to read all of this. Update: I definitely did not communicate the scenario well in my initial writeup. I have since revised the writeup quite a bit, but to be extra sure: The question is about how to implement an async "read all the data available this moment" operation. My apologies to the people who took the time to read and answer without me making my intent clear enough.

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• ArrayList throwing exception on retrieval from google datastore (with gwt, java)

  - by sumeet

  I'm using Google Web Toolkit with java and google datastore as database. The entity class has arraylist and on trying to retrieve the data from data base I'm getting the exception: Type 'org.datanucleus.sco.backed.ArrayList' was not included in the set of types which can be serialized by this SerializationPolicy or its Class object could not be loaded. For security purposes, this type will not be serialized. I'm using JPA. Entity code: package com.ver2.DY.client; import java.io.Serializable; import java.util.ArrayList; import javax.jdo.annotations.IdGeneratorStrategy; import javax.jdo.annotations.PersistenceCapable; import javax.jdo.annotations.Persistent; import javax.jdo.annotations.PrimaryKey; import com.google.gwt.user.client.rpc.IsSerializable; @PersistenceCapable public class ChatInfo implements Serializable, IsSerializable{ @PrimaryKey @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY) private Long topicId; @Persistent private String chatTopic; @Persistent private ArrayList messages = new ArrayList(); @Persistent private boolean isFirstPost; public ChatInfo() { } public Long getTopicId() { return topicId; } public void setTopicId(Long topicId) { this.topicId = topicId; } public String getChatTopic() { return chatTopic; } public void setChatTopic(String chatTopic) { this.chatTopic = chatTopic; } public ArrayList getMessages() { return messages; } public void addMessage(String newMsg) { messages.add(newMsg); } public boolean isFirstPost() { return isFirstPost; } public void setFirstPost(boolean isFirstPost) { this.isFirstPost = isFirstPost; } } Method in db class: @Transactional public ChatInfo[] getAllChat() { PersistenceManager pm = PMF.get().getPersistenceManager(); List chats = null; ChatInfo[] infos = null; String query = "select from " + ChatInfo.class.getName(); try{ chats = (List) pm.newQuery(query).execute(); infos = new ChatInfo[chats.size()]; for(int i=0;i } It is a bit strange because earlier I was able to insert and retrieve the data but it now throwing an exception. On searching the web I could find that I need to convert the Arraylist from some DataNucleus type to java util but not sure how to do that.

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• Using sem_t in a Qt Project

  - by thauburger

  Hi everyone, I'm working on a simulation in Qt (C++), and would like to make use of a Semaphore wrapper class I made for the sem_t type. Although I am including semaphore.h in my wrapper class, running qmake provides the following error: 'sem_t does not name a type' I believe this is a library/linking error, since I can compile the class without problems from the command line. I've read that you can specify external libraries to include during compilation. However, I'm a) not sure how to do this in the project file, and b) not sure which library to include in order to access semaphore.h. Any help would be greatly appreciated. Thanks, Tom Here's the wrapper class for reference: Semaphore.h #ifndef SEMAPHORE_H #define SEMAPHORE_H #include <semaphore.h> class Semaphore { public: Semaphore(int initialValue = 1); int getValue(); void wait(); void post(); private: sem_t mSemaphore; }; #endif Semaphore.cpp #include "Semaphore.h" Semaphore::Semaphore(int initialValue) { sem_init(&mSemaphore, 0, initialValue); } int Semaphore::getValue() { int value; sem_getvalue(&mSemaphore, &value); return value; } void Semaphore::wait() { sem_wait(&mSemaphore); } void Semaphore::post() { sem_post(&mSemaphore); } And, the QT Project File: TARGET = RestaurantSimulation TEMPLATE = app QT += SOURCES += main.cpp \ RestaurantGUI.cpp \ RestaurantSetup.cpp \ WidgetManager.cpp \ RestaurantView.cpp \ Table.cpp \ GUIFood.cpp \ GUIItem.cpp \ GUICustomer.cpp \ GUIWaiter.cpp \ Semaphore.cpp HEADERS += RestaurantGUI.h \ RestaurantSetup.h \ WidgetManager.h \ RestaurantView.h \ Table.h \ GUIFood.h \ GUIItem.h \ GUICustomer.h \ GUIWaiter.h \ Semaphore.h FORMS += RestaurantSetup.ui LIBS += Full Compiler Output: g++ -c -pipe -g -gdwarf-2 -arch i386 -Wall -W -DQT_GUI_LIB -DQT_CORE_LIB -DQT_SHARED - I/usr/local/Qt4.6/mkspecs/macx-g++ -I. - I/Library/Frameworks/QtCore.framework/Versions/4/Headers -I/usr/include/QtCore - I/Library/Frameworks/QtGui.framework/Versions/4/Headers -I/usr/include/QtGui - I/usr/include -I. -I. -F/Library/Frameworks -o main.o main.cpp In file included from RestaurantGUI.h:10, from main.cpp:2: Semaphore.h:14: error: 'sem_t' does not name a type make: *** [main.o] Error 1 make: Leaving directory `/Users/thauburger/Desktop/RestaurantSimulation' Exited with code 2. Error while building project RestaurantSimulation When executing build step 'Make'

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• Casting an object to two interfaces at the same time, to call a generic method

  - by Bruno Martinez

  I want to call a generic method that constrains the input type T to implement two interfaces: interface IA { } interface IB { } void foo<T>(T t) where T : IA, IB { } How can I fix the last line of void bar(object obj) { if (obj is IA && obj is IB) { foo((IA && IB)obj); } } ? Reflection probably allows to do the call, but I would like to stay within the language.

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• Passing array by ref.

  - by atch

  Ref. to my last post and sellibitze's comment to that post on passing array by ref rather than by value, why is it that when I'm passing array by value compiler can deduce arguments but it won't do it if I pass it by value? @Paul So just to make it clear when I'm declaring fnc: void f(int a[]);//I'm passing a pointer but when I'm declaring: void f(int &a[]);//I'm passing a ref? Do I understand this correctly now?

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• Problems Mapping a List of Serializable Objets with JDO

  - by Sergio del Amo

  I have two classes Invoice and InvoiceItem. I would like Invoice to have a List of InvoiceItem Objets. I have red that the list must be of primitive or serializable objects. I have made InvoiceItem Serializable. Invoice.java looks like import java.util.ArrayList; import java.util.Date; import java.util.List; import javax.jdo.annotations.Column; import javax.jdo.annotations.Embedded; import javax.jdo.annotations.EmbeddedOnly; import javax.jdo.annotations.IdGeneratorStrategy; import javax.jdo.annotations.IdentityType; import javax.jdo.annotations.PersistenceCapable; import javax.jdo.annotations.Persistent; import javax.jdo.annotations.Element; import javax.jdo.annotations.PrimaryKey; import com.google.appengine.api.datastore.Key; import com.softamo.pelicamo.shared.InvoiceCompanyDTO; @PersistenceCapable(identityType = IdentityType.APPLICATION) public class Invoice { @PrimaryKey @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY) private Long id; @Persistent private String number; @Persistent private Date date; @Persistent private List<InvoiceItem> items = new ArrayList<InvoiceItem>(); public Invoice() {} public Long getId() { return id; } public void setId(Long id) {this.id = id;} public String getNumber() { return number;} public void setNumber(String invoiceNumber) { this.number = invoiceNumber;} public Date getDate() { return date;} public void setDate(Date invoiceDate) { this.date = invoiceDate;} public List<InvoiceItem> getItems() { return items;} public void setItems(List<InvoiceItem> items) { this.items = items;} } and InvoiceItem.java looks like import java.io.Serializable; import java.math.BigDecimal; import javax.jdo.annotations.PersistenceCapable; import javax.jdo.annotations.Persistent; @PersistenceCapable public class InvoiceItem implements Serializable { @Persistent private BigDecimal amount; @Persistent private float quantity; public InvoiceItem() {} public BigDecimal getAmount() { return amount;} public void setAmount(BigDecimal amount) { this.amount = amount;} public float getQuantity() { return quantity;} public void setQuantity(float quantity) { this.quantity = quantity;} } I get the next error while running a JUnit test. javax.jdo.JDOUserException: Attempt to handle persistence for object using datastore-identity yet StoreManager for this datastore doesn't support that identity type at org.datanucleus.jdo.NucleusJDOHelper.getJDOExceptionForNucleusException(NucleusJDOHelper.java:375) at org.datanucleus.jdo.JDOPersistenceManager.jdoMakePersistent(JDOPersistenceManager.java:674) at org.datanucleus.jdo.JDOPersistenceManager.makePersistent(JDOPersistenceManager.java:694) at com.softamo.pelicamo.server.InvoiceStore.add(InvoiceStore.java:23) at com.softamo.pelicamo.server.PopulateStorage.storeInvoices(PopulateStorage.java:58) at com.softamo.pelicamo.server.PopulateStorage.run(PopulateStorage.java:46) at com.softamo.pelicamo.server.InvoiceStoreTest.setUp(InvoiceStoreTest.java:44) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44) at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15) at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41) at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:27) at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:31) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:76) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50) at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193) at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191) at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42) at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184) at org.junit.runners.ParentRunner.run(ParentRunner.java:236) at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:46) at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197) NestedThrowablesStackTrace: Attempt to handle persistence for object using datastore-identity yet StoreManager for this datastore doesn't support that identity type org.datanucleus.exceptions.NucleusUserException: Attempt to handle persistence for object using datastore-identity yet StoreManager for this datastore doesn't support that identity type at org.datanucleus.state.AbstractStateManager.<init>(AbstractStateManager.java:128) at org.datanucleus.state.JDOStateManagerImpl.<init>(JDOStateManagerImpl.java:215) at org.datanucleus.jdo.JDOAdapter.newStateManager(JDOAdapter.java:119) at org.datanucleus.state.StateManagerFactory.newStateManagerForPersistentNew(StateManagerFactory.java:150) at org.datanucleus.ObjectManagerImpl.persistObjectInternal(ObjectManagerImpl.java:1297) at org.datanucleus.sco.SCOUtils.validateObjectForWriting(SCOUtils.java:1476) at org.datanucleus.store.mapped.scostore.ElementContainerStore.validateElementForWriting(ElementContainerStore.java:380) at org.datanucleus.store.mapped.scostore.FKListStore.validateElementForWriting(FKListStore.java:609) at org.datanucleus.store.mapped.scostore.FKListStore.internalAdd(FKListStore.java:344) at org.datanucleus.store.appengine.DatastoreFKListStore.internalAdd(DatastoreFKListStore.java:146) at org.datanucleus.store.mapped.scostore.AbstractListStore.addAll(AbstractListStore.java:128) at org.datanucleus.store.mapped.mapping.CollectionMapping.postInsert(CollectionMapping.java:157) at org.datanucleus.store.appengine.DatastoreRelationFieldManager.runPostInsertMappingCallbacks(DatastoreRelationFieldManager.java:216) at org.datanucleus.store.appengine.DatastoreRelationFieldManager.access$200(DatastoreRelationFieldManager.java:47) at org.datanucleus.store.appengine.DatastoreRelationFieldManager$1.apply(DatastoreRelationFieldManager.java:115) at org.datanucleus.store.appengine.DatastoreRelationFieldManager.storeRelations(DatastoreRelationFieldManager.java:80) at org.datanucleus.store.appengine.DatastoreFieldManager.storeRelations(DatastoreFieldManager.java:955) at org.datanucleus.store.appengine.DatastorePersistenceHandler.storeRelations(DatastorePersistenceHandler.java:527) at org.datanucleus.store.appengine.DatastorePersistenceHandler.insertPostProcess(DatastorePersistenceHandler.java:299) at org.datanucleus.store.appengine.DatastorePersistenceHandler.insertObjects(DatastorePersistenceHandler.java:251) at org.datanucleus.store.appengine.DatastorePersistenceHandler.insertObject(DatastorePersistenceHandler.java:235) at org.datanucleus.state.JDOStateManagerImpl.internalMakePersistent(JDOStateManagerImpl.java:3185) at org.datanucleus.state.JDOStateManagerImpl.makePersistent(JDOStateManagerImpl.java:3161) at org.datanucleus.ObjectManagerImpl.persistObjectInternal(ObjectManagerImpl.java:1298) at org.datanucleus.ObjectManagerImpl.persistObject(ObjectManagerImpl.java:1175) at org.datanucleus.jdo.JDOPersistenceManager.jdoMakePersistent(JDOPersistenceManager.java:669) at org.datanucleus.jdo.JDOPersistenceManager.makePersistent(JDOPersistenceManager.java:694) at com.softamo.pelicamo.server.InvoiceStore.add(InvoiceStore.java:23) at com.softamo.pelicamo.server.PopulateStorage.storeInvoices(PopulateStorage.java:58) at com.softamo.pelicamo.server.PopulateStorage.run(PopulateStorage.java:46) at com.softamo.pelicamo.server.InvoiceStoreTest.setUp(InvoiceStoreTest.java:44) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44) at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15) at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41) at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:27) at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:31) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:76) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50) at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193) at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191) at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42) at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184) at org.junit.runners.ParentRunner.run(ParentRunner.java:236) at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:46) at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197) Moreover, when I try to store an invoice with a list of items through my app. In the development console I can see that items are not persisted to any field while the rest of the invoice class properties are stored properly. Does anyone know what I am doing wrong? Solution As pointed in the answers, the error says that the InvoiceItem class was missing a primaryKey. I tried with: @PrimaryKey @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY) private Long id; But I was getting javax.jdo.JDOFatalUserException: Error in meta-data for InvoiceItem.id: Cannot have a java.lang.Long primary key and be a child object (owning field is Invoice.items). In persist list of objets, @aldrin pointed that For child classes the primary key has to be a com.google.appengine.api.datastore.Key value (or encoded as a string) see So, I tried with Key. It worked. @PrimaryKey @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY) private Key id;

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• Cancel UITouch Events When View Covered By Modal UIViewController

  - by kkrizka

  Hi there, I am writing an application where the user has to move some stuff on the screen using his fingers and drop them. To do this, I am using the touchesBegan,touchesEnded... function of each view that has to be moved. The problem is that sometimes the views are covered by a view displayed using the [UIViewController presentModalViewController] function. As soon as that happens, the UIView that I was moving stops receiving the touch events, since it was covered up. But there is no event telling me that it stopped receiving the events, so I can reset the state of the moved view. The following is an example that demonstrates this. The functions are part of a UIView that is being shown in the main window. It listens to touch events and when I drag the finger for some distance, it presents a modal view that covers everything. In the Run Log, it prints what touch events are received. - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { NSLog(@"touchesBegan"); touchStart=[[touches anyObject] locationInView:self]; } - (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event { CGPoint touchAt=[[touches anyObject] locationInView:self]; float xx=(touchAt.x-touchStart.x)*(touchAt.x-touchStart.x); float yy=(touchAt.y-touchStart.y)*(touchAt.y-touchStart.y); float rr=xx+yy; NSLog(@"touchesMoved %f",rr); if(rr > 100) { NSLog(@"Show modal"); [viewController presentModalViewController:[UIViewController new] animated:NO]; } } - (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event { NSLog(@"touchesEnded"); } - (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event { NSLog(@"touchesCancelled"); } But when I test the application and trigger the modal dialog to be displayed, the following is the output in the Run Log. [Session started at 2010-03-27 16:17:14 -0700.] 2010-03-27 16:17:18.831 modelTouchCancel[2594:207] touchesBegan 2010-03-27 16:17:19.485 modelTouchCancel[2594:207] touchesMoved 2.000000 2010-03-27 16:17:19.504 modelTouchCancel[2594:207] touchesMoved 4.000000 2010-03-27 16:17:19.523 modelTouchCancel[2594:207] touchesMoved 16.000000 2010-03-27 16:17:19.538 modelTouchCancel[2594:207] touchesMoved 26.000000 2010-03-27 16:17:19.596 modelTouchCancel[2594:207] touchesMoved 68.000000 2010-03-27 16:17:19.624 modelTouchCancel[2594:207] touchesMoved 85.000000 2010-03-27 16:17:19.640 modelTouchCancel[2594:207] touchesMoved 125.000000 2010-03-27 16:17:19.641 modelTouchCancel[2594:207] Show modal Any suggestions on how to reset the state of a UIView when its touch events are interrupted by a modal view?

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• Become UIScrollViewDelegate delegate for UITableView

  - by Brian

  I have a UITableView instance variable. I want to be able to register my view controller to be the UIScrollViewDelegate for my UITableView controller. I have already tried tableView.delegate = self; But when scrolling, my methods - (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView - (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate don't get called. Any suggestions?

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• Can we define an interface within an interface?

  - by girinie

  Hi , I like to know can we define an interface within an interface. like interface abc { void show(); public interface xyz { void read(); } } This was question asked in interview. Any real time use of this.

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• copied the reachability-test from apple, but the linker gives a failure

  - by nico

  i have tried to use the reachability-project published by apple to detect a reachability in an own example. i copied the most initialization, but i get this failure in the linker: Ld build/switchViews.build/Debug-iphoneos/test.build/Objects-normal/armv6/test normal armv6 cd /Users/uid04100/Documents/TEST setenv IPHONEOS_DEPLOYMENT_TARGET 3.1.3 setenv PATH "/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin:/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin" /Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc-4.2 -arch armv6 -isysroot /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS3.1.3.sdk -L/Users/uid04100/Documents/TEST/build/Debug-iphoneos -F/Users/uid04100/Documents/TEST/build/Debug-iphoneos -filelist /Users/uid04100/Documents/TEST/build/switchViews.build/Debug-iphoneos/test.build/Objects-normal/armv6/test.LinkFileList -dead_strip -miphoneos-version-min=3.1.3 -framework Foundation -framework UIKit -framework CoreGraphics -o /Users/uid04100/Documents/TEST/build/switchViews.build/Debug-iphoneos/test.build/Objects-normal/armv6/test Undefined symbols: "_SCNetworkReachabilitySetCallback", referenced from: -[Reachability startNotifer] in Reachability.o "_SCNetworkReachabilityCreateWithAddress", referenced from: +[Reachability reachabilityWithAddress:] in Reachability.o "_SCNetworkReachabilityScheduleWithRunLoop", referenced from: -[Reachability startNotifer] in Reachability.o "_SCNetworkReachabilityGetFlags", referenced from: -[Reachability connectionRequired] in Reachability.o -[Reachability currentReachabilityStatus] in Reachability.o "_SCNetworkReachabilityUnscheduleFromRunLoop", referenced from: -[Reachability stopNotifer] in Reachability.o "_SCNetworkReachabilityCreateWithName", referenced from: +[Reachability reachabilityWithHostName:] in Reachability.o ld: symbol(s) not found collect2: ld returned 1 exit status my delegate.h: import @class Reachability; @interface testAppDelegate : NSObject { UIWindow *window; UINavigationController *navigationController; Reachability* hostReach; Reachability* internetReach; Reachability* wifiReach; } @property (nonatomic, retain) IBOutlet UIWindow *window; @property (nonatomic, retain) IBOutlet UINavigationController *navigationController; @end my delegate.m: import "testAppDelegate.h" import "SecondViewController.h" import "Reachability.h" @implementation testAppDelegate @synthesize window; @synthesize navigationController; (void) updateInterfaceWithReachability: (Reachability*) curReach { if(curReach == hostReach) { BOOL connectionRequired= [curReach connectionRequired]; if(connectionRequired) { //in these brackets schould be some code with sense, if i´m getting it to run } else { } } if(curReach == internetReach) { } if(curReach == wifiReach) { } } //Called by Reachability whenever status changes. - (void) reachabilityChanged: (NSNotification* )note { Reachability* curReach = [note object]; NSParameterAssert([curReach isKindOfClass: [Reachability class]]); [self updateInterfaceWithReachability: curReach]; } (void)applicationDidFinishLaunching:(UIApplication *)application { // Override point for customization after application launch // Observe the kNetworkReachabilityChangedNotification. When that notification is posted, the // method "reachabilityChanged" will be called. // [[NSNotificationCenter defaultCenter] addObserver: self selector: @selector(reachabilityChanged:) name: kReachabilityChangedNotification object: nil]; //Change the host name here to change the server your monitoring hostReach = [[Reachability reachabilityWithHostName: @"www.apple.com"] retain]; [hostReach startNotifer]; [self updateInterfaceWithReachability: hostReach]; internetReach = [[Reachability reachabilityForInternetConnection] retain]; [internetReach startNotifer]; [self updateInterfaceWithReachability: internetReach]; wifiReach = [[Reachability reachabilityForLocalWiFi] retain]; [wifiReach startNotifer]; [self updateInterfaceWithReachability:wifiReach]; [window addSubview:[navigationController view]]; [window makeKeyAndVisible]; } (void)dealloc { [navigationController release]; [window release]; [super dealloc]; } @end

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• EJB3 Transaction Propogation

  - by Matt S.

  I have a stateless bean something like: @Stateless public class MyStatelessBean implements MyStatelessLocal, MyStatelessRemote { @PersistenceContext(unitName="myPC") private EntityManager mgr; @TransationAttribute(TransactionAttributeType.SUPPORTED) public void processObjects(List<Object> objs) { // this method just processes the data; no need for a transaction for(Object obj : objs) { this.process(obj); } } @TransationAttribute(TransactionAttributeType.REQUIRES_NEW) public void process(Object obj) { // do some work with obj that must be in the scope of a transaction this.mgr.merge(obj); // ... this.mgr.merge(obj); // ... this.mgr.flush(); } } The typically usage then is the client would call processObjects(...), which doesn't actually interact with the entity manager. It does what it needs to do and calls process(...) individually for each object to process. The duration of process(...) is relatively short, but processObjects(...) could take a very long time to run through everything. Therefore I don't want it to maintain an open transaction. I do need the individual process(...) operations to operate within their own transaction. This should be a new transaction for every call. Lastly I'd like to keep the option open for the client to call process(...) directly. I've tried a number of different transaction types: never, not supported, supported (on processObjects) and required, requires new (on process) but I get TransactionRequiredException every time merge() is called. I've been able to make it work by splitting up the methods into two different beans: @Stateless @TransationAttribute(TransactionAttributeType.NOT_SUPPORTED) public class MyStatelessBean1 implements MyStatelessLocal1, MyStatelessRemote1 { @EJB private MyStatelessBean2 myBean2; public void processObjects(List<Object> objs) { // this method just processes the data; no need for a transaction for(Object obj : objs) { this.myBean2.process(obj); } } } @Stateless public class MyStatelessBean2 implements MyStatelessLocal2, MyStatelessRemote2 { @PersistenceContext(unitName="myPC") private EntityManager mgr; @TransationAttribute(TransactionAttributeType.REQUIRES_NEW) public void process(Object obj) { // do some work with obj that must be in the scope of a transaction this.mgr.merge(obj); // ... this.mgr.merge(obj); // ... this.mgr.flush(); } } but I'm still curious if it's possible to accomplish this in one class. It looks to me like the transaction manager only operates at the bean level, even when individual methods are given more specific annotations. So if I mark one method in a way to prevent the transaction from starting calling other methods within that same instance will also not create a transaction, no matter how they're marked? I'm using JBoss Application Server 4.2.1.GA, but non-specific answers are welcome / preferred.

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