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  • Sending and receiving async over multiprocessing.Pipe() in Python

    - by dcolish
    I'm having some issues getting the Pipe.send to work in this code. What I would ultimately like to do is send and receive messages to and from the foreign process while its running in a fork. This is eventually going to be integrated into a pexpect loop for talking to interpreter processes. ` from multiprocessing import Process, Pipe def f(conn): cmd = '' if conn.poll(): cmd = conn.recv() i = 1 i += 1 conn.send([42 + i, cmd, 'hello']) if __name__ == '__main__': parent_conn, child_conn = Pipe() p = Process(target=f, args=(child_conn,)) p.start() from pdb import set_trace; set_trace() while parent_conn.poll(): print parent_conn.recv() # prints "[42, None, 'hello']" parent_conn.send('OHHAI') p.join() `

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  • Unbuffered subprocess output (last line missing)

    - by plok
    I must be overlooking something terribly obvious. I need to execute a C program, display its output in real time and finally parse its last line, which should be straightforward as the last line printed is always the same. process = subprocess.Popen(args, shell = True, stdout = subprocess.PIPE, stderr = subprocess.PIPE) # None indicates that the process hasn't terminated yet. while process.poll() is None: # Always save the last non-emtpy line that was output by the child # process, as it will write an empty line when closing its stdout. out = process.stdout.readline() if out: last_non_empty_line = out if verbose: sys.stdout.write(out) sys.stdout.flush() # Parse 'out' here... Once in a while, however, the last line is not printed. The default value for Popens's bufsize is 0, so it is supposed to be unbuffered. I have also tried, to no avail, adding fflush(stdout) to the C code just before exiting, but it seems that there is absolutely no need to flush a stream before exiting a program. Ideas anyone?

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  • Java program strange behavior, how to fix it ?

    - by Frank
    My notebook has Intel CPU, running Windows Vista. My program looks like this : public class Tool_Lib_Simple { public static void main(String[] args) { System.out.println("123"); } } When I run it, I expect to see : "123", but the output was : "Hi NM : How are you NM ?" which was the old output from two days ago before I changed my program. If I copy this program into another project in Netbean 6.7, it will run correctly and output "123", and if I change the program name from "Tool_Lib_Simple" to something else, it will also output "123", but just not under the name of "Tool_Lib_Simple" in the current project's src directory, I've deleted the "build" directory and did re-compile, re-build, it still gives me "Hi NM : How are you NM ?" as a result, seems to me the old version of my program is saved in the hard drive or ram and got stuck there, I've programmed many years, hardly ever encounter this kind of problem, how to fix this ? Frank

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  • java util iterator but cannot import java.util.iterator

    - by qwertzuiop13
    Given this Code import java.util.Iterator; private static List<String> someList = new ArrayList<String>(); public static void main(String[] args) { someList.add("monkey"); someList.add("donkey"); //Code works when I change Iterator to java.util.Iterator, but import //is not possible? for(Iterator<String> i = someList.iterator(); i.hasNext(); ) { String item = i.next(); System.out.println(item); } } I receive the error: The type Iterator is not generic; it cannot be parameterized with arguments Eclipse tells me that the import java.util.iterator conflicts with a type defined in the same file. lol... ?

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  • o display an image

    - by Vimal Basdeo
    I want to display an image from the web to a panel in another Jframe at the click of a button but whenever I click the button first the image loads and during this time the current form potentially freezes and once the image has loaded the form is displayed with the image.. How can I avoid the situation where my form freezes since it is very irritating My codes :: My current class private void btn_TrackbusActionPerformed(java.awt.event.ActionEvent evt) { try { sendMessage("Query,map,$,start,211,Arsenal,!"); System.out.println(receiveMessage()); } catch (UnknownHostException ex) { Logger.getLogger(client_Trackbus.class.getName()).log(Level.SEVERE, null, ex); } catch (IOException ex) { Logger.getLogger(client_Trackbus.class.getName()).log(Level.SEVERE, null, ex); } catch (Exception ex) { Logger.getLogger(client_Trackbus.class.getName()).log(Level.SEVERE, null, ex); } client_trackedbus nextform=new client_trackedbus(planform,connection,packet_receive,packet_send); this.setVisible(false); this.dispose(); nextform.setVisible(true); // TODO add your handling code here: } My next class that displays the image public class client_trackedbus extends javax.swing.JFrame { client_planform planform=null; DatagramSocket connection=null; DatagramPacket packet_receive=null; DatagramPacket packet_send=null; JLabel label=null; /** Creates new form client_trackedbus */ public client_trackedbus(client_planform planform,DatagramSocket connection,DatagramPacket packet_receive,DatagramPacket packet_send) { initComponents(); this.planform=planform; this.connection=connection; this.packet_receive=packet_receive; this.packet_send=packet_send; try { displayMap("http://www.huddletogether.com/projects/lightbox2/images/image-2.jpg", jPanel1, new JLabel()); } catch (MalformedURLException ex) { Logger.getLogger(client_trackedbus.class.getName()).log(Level.SEVERE, null, ex); } } private void displayMap(String url,JPanel panel,JLabel label) throws MalformedURLException{ URL imageurl=new URL(url); Image image=(Toolkit.getDefaultToolkit().createImage(imageurl)); ImageIcon icon = new ImageIcon(image); label.setIcon(icon); panel.add(label); // System.out.println(panel.getSize().width); this.getContentPane().add(panel); } /** This method is called from within the constructor to * initialize the form. * WARNING: Do NOT modify this code. The content of this method is * always regenerated by the Form Editor. */ @SuppressWarnings("unchecked") // <editor-fold defaultstate="collapsed" desc="Generated Code"> private void initComponents() { jPanel1 = new javax.swing.JPanel(); jLabel1 = new javax.swing.JLabel(); btn_Exit = new javax.swing.JButton(); btn_Plan = new javax.swing.JButton(); setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE); setTitle("Public Transport Journey Planner"); javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1); jPanel1.setLayout(jPanel1Layout); jPanel1Layout.setHorizontalGroup( jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGap(0, 368, Short.MAX_VALUE) ); jPanel1Layout.setVerticalGroup( jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGap(0, 172, Short.MAX_VALUE) ); jLabel1.setFont(new java.awt.Font("Arial", 1, 18)); jLabel1.setText("Your tracked bus"); btn_Exit.setText("Exit"); btn_Exit.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { btn_ExitActionPerformed(evt); } }); btn_Plan.setText("Plan journey"); btn_Plan.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { btn_PlanActionPerformed(evt); } }); javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane()); getContentPane().setLayout(layout); layout.setHorizontalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(layout.createSequentialGroup() .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(layout.createSequentialGroup() .addGap(104, 104, 104) .addComponent(jLabel1)) .addGroup(layout.createSequentialGroup() .addContainerGap() .addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)) .addGroup(layout.createSequentialGroup() .addGap(65, 65, 65) .addComponent(btn_Plan) .addGap(65, 65, 65) .addComponent(btn_Exit, javax.swing.GroupLayout.PREFERRED_SIZE, 87, javax.swing.GroupLayout.PREFERRED_SIZE))) .addContainerGap(20, Short.MAX_VALUE)) ); layout.setVerticalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(layout.createSequentialGroup() .addGap(35, 35, 35) .addComponent(jLabel1) .addGap(18, 18, 18) .addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) .addGap(18, 18, 18) .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) .addComponent(btn_Exit) .addComponent(btn_Plan)) .addContainerGap(12, Short.MAX_VALUE)) ); pack(); }// </editor-fold> private void btn_ExitActionPerformed(java.awt.event.ActionEvent evt) { // TODO add your handling code here: Exitform(); } private void btn_PlanActionPerformed(java.awt.event.ActionEvent evt) { // TODO add your handling code here: this.setVisible(false); this.dispose(); this.planform.setVisible(true); } private void Exitform(){ this.setVisible(false); this.dispose(); } /** * @param args the command line arguments */ public static void main(String args[]) { java.awt.EventQueue.invokeLater(new Runnable() { public void run() { // new client_trackedbus().setVisible(true); } }); } // Variables declaration - do not modify private javax.swing.JButton btn_Exit; private javax.swing.JButton btn_Plan; private javax.swing.JLabel jLabel1; private javax.swing.JPanel jPanel1; // End of variables declaration }

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  • Pylons/Routes Did url_for() change within templates?

    - by Charles Merram
    I'm getting an error: GenerationException: url_for could not generate URL. Called with args: () {} from this line of a mako template: <p>Your url is ${h.url_for()}</p> Over in my helpers.py, I do have: from routes import url_for Looking at the Routes-1.12.1-py2.6.egg/routes/util.py, I seem to go wrong about line it calls _screenargs(). This is simple functionality from the Pylons book. What silly thing am I doing wrong? Was there a new url_current()? Where?

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  • cmake add_library at a custom location

    - by celil
    I need to build a library that is to be placed at a custom location stored in the variable CUSTOM_OUTDIR. Currently, I am using the following code to make sure that the library is copied to its proper location. ADD_LIBRARY(example MODULE example.c) GET_TARGET_PROPERTY(FILEPATH example LOCATION) ADD_CUSTOM_COMMAND( TARGET example POST_BUILD COMMAND ${CMAKE_COMMAND} ARGS -E copy ${FILEPATH} ${CUSTOM_OUTDIR} ) However, this is not a good solution as the copying is done post_build, and I end up with two copies of the library. Is there a way to setup CMAKE_BINARY_DIR just for the example library so that only one copy of it is kept in the proper location?

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  • "The left hand side of an assignment must be a variable" due to extra parentheses

    - by polygenelubricants
    I know why the following code doesn't compile: public class Main { public static void main(String args[]) { main((null)); // this is fine! (main(null)); // this is NOT! } } What I'm wondering is why my compiler (javac 1.6.0_17, Windows version) is complaining "The left hand side of an assignment must be a variable". I'd expect something like "Don't put parentheses around a method invokation, dummy!", instead. So why is the compiler making a totally unhelpful complaint about something that is blatantly irrelevant? Is this the result of an ambiguity in the grammar? A bug in the compiler? If it's the former, could you design a language such that a compiler would never be so off-base about a syntax error like this?

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  • How can I set up .Net unhanlded exception handling in a windows service?

    - by Mike Pateras
    protected override void OnStart(string[] args) { AppDomain.CurrentDomain.UnhandledException += new UnhandledExceptionEventHandler(CurrentDomain_UnhandledException); Thread.Sleep(10000); throw new Exception(); } void CurrentDomain_UnhandledException(object sender, UnhandledExceptionEventArgs e) { } I attached a debugger to the above code in my windows service, setting a breakpoint in CurrentDomain_UnhandledException, but it was never hit. The exception pops up saying that it is unhandled, and then the service stops. I even tried putting some code in the event handler, in case it was getting optimized away. Is this not the proper way to set up unhandled exception handling in a windows service?

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  • socket.setdefaulttimeout interacting with M2Crypto connection

    - by Becky
    Hello - I'm making a secure SSL connection to a server using python and M2Crypto. See code below. from M2Crypto import SSL, m2,x509 from M2Crypto.m2xmlrpclib import Server, SSL_Tranport ctx = SSL.Context() m2.ssl_ctx_use_pkey_privkey(ctx.ctx,myKey.pkey) m2.ssl_ctx_use_x509(ctx.ctx,myCert.x509) server = Server(serverUrl, SSL_Transport(ctx)) server.ping() The above works fine. If I try to change the default socket timeout by adding the following two lines at the beginning of the code, I get a protocol error. import socket socket.setdefaulttimeout(40) This is the error I receive: File "/usr/local/lib/python2.4/xmlrpclib.py", line 1096, in call return self._send(self._name, args) File "/usr/local/lib/python2.4/xmlrpclib.py", line 1383, in _request verbose=self._verbose File "/usr/local/lib/python2.4/site-packages/M2Crypto/m2xmlrpclib.py", line 68, in request headers xmlrpclib.ProtocolError: Why is the default socket timeout causing problems?

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  • Stuck at "Hello World" with IntelliJ IDEA 9.0.1 for Scala

    - by Alex R
    I've been using Eclipse since 2.x and and IDEs in general for over 20 years (since Turbo Pascal and Turbo C in the late '80s!). (that preamble is supposed to imply, "I'm not an idiot" ... LOL :-] ) I'm trying to use the debugger in IntelliJ 9.0.1. I've resigned myself to an old standby: class hello { def main(a: Array[String]) = println("got args: " + a) } Alas, I'm unable to get even this simple Scala example to run. I'd like to eventually put a breakpoint in it, but for now just running it would be great. I have Java 1.6u20 and the Scala plug-in 0.3.473 (January 2010). The error below summarizes my experience: What possibly could I be doing wrong? Thanks

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  • Java: what are IOEXceptions in BufferedReader's readLine() for?

    - by HH
    I can "fix" the below exception with a try-catch loop but I cannot understand the reason. Why does the part "in.readLine()" continuosly ignite IOExceptions? What is really the purpose of throwing such exceptions, the goal probably not just more side effects? Code and IOExceptions $ javac ReadLineTest.java ReadLineTest.java:9: unreported exception java.io.IOException; must be caught or declared to be thrown while((s=in.readLine())!=null){ ^ 1 error $ cat ReadLineTest.java import java.io.*; import java.util.*; public class ReadLineTest { public static void main(String[] args) { String s; BufferedReader in = new BufferedReader(new InputStreamReader(System.in)); // WHY IOException here? while((s=in.readLine())!=null){ System.out.println(s); } } }

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  • How to Automatically re-raise Exceptions

    - by Brian
    If you wrap a call to HttpResponse.End within a try catch block, the ThreadAbortException would automatically be re-raised. I assume this is the case even if you wrap the try catch block in a try catch block. How can I accomplish the same thing? I do not have a real-world application for this. namespace Program { class ReJoice { public void End() //This does not automatically re-raise the exception if caught. { throw new Exception(); } } class Program { static void Main(string[] args) { try { ReJoice x = new ReJoice(); x.End(); } catch (Exception e) {} } } }

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  • Using Java Reflections to retrieve member classes

    - by darkie15
    Hi All, I am using .getDeclaredClasses() method to retrieve all the classes that have been defined in object. However, I am not able to retrieve anonymous classes defined in the class. Here is the code sample that I am testing: public class TempCodes { public static void main(String[] args) { Ball b = new Ball() { public void hit() { System.out.println("You hit it!"); } }; b.hit(); } interface Ball { void hit(); } } and this is what my code does: memClass = className.getDeclaredClasses(); if (memClass .length > 0) { for (int index = 0 ; index < memClass .length ; index++) { System.out.println("\t\t\t" + memClass [index]); } } Can anyone help me understand how to retrieve the anonymous class? Regards, darkie

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  • Preserve images in Excel headers using Apache POI

    - by ddm
    I am trying to generate Excel reports using Apache POI 3.6 (latest). Since POI has limited support for header and footer generation (text only), I decided to start from a blank excel file with the header already prepared and fill the Excel cells using POI (cf. question 714172). Unfortunately, when opening the workbook with POI and writing it immediately to disk (without any cell manpulation), the header seems to be lost. Here is the code I used to test this behavior: public final class ExcelWorkbookCreator { public static void main(String[] args) { FileOutputStream outputStream = null; try { outputStream = new FileOutputStream(new File("dump.xls")); InputStream inputStream = ExcelWorkbookCreator.class.getResourceAsStream("report_template.xls"); HSSFWorkbook workbook = new HSSFWorkbook(inputStream, true); workbook.write(outputStream); } catch (Exception exception) { throw new RuntimeException(exception); } finally { if (outputStream != null) { try { outputStream.close(); } catch (IOException exception) { // Nothing much to do } } } } }

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  • How long does it take to iterate through a long loop?

    - by Carl Rosenberger
    On a modern 64-Bit machine, how long do you think it takes to iterate through all the positive long numbers? Below is a code snippet in Java to demonstrate the idea. Without running the code yourself, how long do you think this code is going to run? How long will similar code run in other programming languages? public class LongLoop { public static void main(String[] args) { long startTime = System.currentTimeMillis(); for (long i = 0; i < Long.MAX_VALUE; i++) { // do nothing, just loop } long stopTime = System.currentTimeMillis(); long duration = stopTime - startTime; System.out.println("Time taken: " + duration + " milliseconds"); } }

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  • Java: startingPath as "public static final" exception

    - by HH
    [Updated] Thanks to polygenelubricants's reply, the real problem is the exception from the method getCanonicalPath() because I cannot include try-catch-loop there. $ cat StartingPath.java import java.util.*; import java.io.*; public class StartingPath { public static final String startingPath = (new File(".")).getCanonicalPath(); public static void main(String[] args){ System.out.println(startingPath); } } $ javac StartingPath.java StartingPath.java:5: unreported exception java.io.IOException; must be caught or declared to be thrown public static final String startingPath = (new File(".")).getCanonicalPath(); ^ 1 error

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  • Epoch is not epoch if do a new Date(0L). Why ?

    - by Antoine Claval
    My problem is pretty straigtforward explained : if i do this : public class Main { public static void main(String[] args) throws Exception { Date d = new Date(0L ); System.out.println(d); } } I get the following output : Thu Jan 01 01:00:00 CET 1970 According to the doc, i was expecting : Thu Jan 01 00:00:00 CET 1970 I would like was going wrong... EDIT : Indeed, i read the doc too fast. I sould have Thu Jan 01 00:00:00 GMT 1970 So, how can i force the use of GMT, and ignore all local time ?

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  • Whats wrong with my backgroundwork method

    - by diver-d
    I am trying to get a background worker process working in a wpf application. it creates 2 files then crashes. BackgroundWorker worker = new BackgroundWorker(); worker.DoWork += delegate(object s, DoWorkEventArgs args) { CreateFile(i.ToString()); }; worker.RunWorkerAsync(); private void CreateFile(string fileName) { string path = string.Format(@"{0}\{1}.txt", directory, fileName); using (StreamWriter sw = new StreamWriter(path)) { sw.WriteLine(fileName); } } I get this error " The requested operation cannot be performed on a file with a user-mapped section open." what am I doing wrong? Any help would be great

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  • Approaches to use Repositories (w/ StructureMap) with AutoMapper?

    - by jacko
    Any idea how I can tell AutoMapper to resolve a TypeConverter constructor argument using StructureMap? ie. We have this: private class GuidToContentProviderConverter : TypeConverter<Guid, ContentProvider> { private readonly IContentProviderRepository _repository; public GuidToContentProviderConverter(IContentProviderRepository repository) { _repository = repository; } protected override ContentProvider ConvertCore(Guid contentProviderId) { return _repository.Get(contentProviderId); } } And in the AutoMap registration: Mapper.CreateMap<Guid, ContentProvider>().ConstructUsing<GuidToContentProviderConverter>(); However, this generates a compile-time error about ctor args. Any ideas? Or ideas to other approaches for using Automapper to hydrate domain objects from viewmodel ID's using a repository?

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  • Java Scripting Engine importing my classes does not work

    - by Ayman
    A code is worth 1000 words of explaining it :-) package jasim; import javax.script.ScriptEngine; import javax.script.ScriptEngineManager; import javax.script.ScriptException; public class JSTest { public static void main(String[] args) throws ScriptException { ScriptEngine jse = new ScriptEngineManager().getEngineByExtension("js"); jse.eval("println(new jasim.JSTest().toString)"); } @Override public String toString() { return "JSTest Object"; } } This code will fail with the below exception: Exception in thread "main" javax.script.ScriptException: sun.org.mozilla.javascript.internal.EcmaError: ReferenceError: "jasim" is not defined. (<Unknown source>#1) in <Unknown source> at line number 1 How do I import my own classes into the ScriptEngine?

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  • Java: design problem with final-value and empty constructor

    - by HH
    $ javac InitInt.java InitInt.java:7: variable right might not have been initialized InitInt(){} ^ 1 error $ cat InitInt.java import java.util.*; import java.io.*; public class InitInt { private final int right; // Design Problem? // I feel the initialization problem is just due to bad style. InitInt(){} InitInt{ // Still the error, "may not be initialized" // How to initialise it? if(snippetBuilder.length()>(charwisePos+25)){ right=charwisePos+25; }else{ right=snippetBuilder.length()-1; } } public static void main(String[] args) { InitInt test = new InitInt(); System.out.println(test.getRight()); } public int getRight(){return right;} } Partial Solutions and Suggestions use "this" to access methods in the class, instead of creating empty constructor change final to non-final with final field value: initialize all final values in every constructor remove the empty constructor, keep your code simple and clean

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  • Java RegEx Pattern not matching (works in .NET)

    - by CDSO1
    Below is an example that is producing an exception in Java (and not matching the input). Perhaps I misunderstood the JavaDoc, but it looks like it should work. Using the same pattern and input in C# will produce a match. import java.util.regex.Matcher; import java.util.regex.Pattern; public class Main { public static void main(String[] args) { String pattern = "aspx\\?uid=([^']*)"; Pattern p = Pattern.compile(pattern); Matcher m = p.matcher("id='page.aspx?uid=123'"); System.out.println(m.groupCount() > 0 ? m.group(1) : "No Matches"); } }

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  • why it throws java.lang.classCastException

    - by matin1234
    Hi this is my class and I want to sort my stack but it will throw an exception please help me thanks! public class jj { public static void main(String[] args){ Stack<Integer> s = new ImplimentingAStackUsingAnArrayOfAGivenSizeN(5); s.push(1); s.push(3); s.push(5); s.push(2); s.push(4); Collections.sort((List<Integer>) (s)); System.out.println(s); while (!s.isEmpty()) { System.out.println(s.pop()); } } } the stack traces: run: Exception in thread "main" java.lang.ClassCastException: datastructurechapter5.ImplimentingAStackUsingAnArrayOfAGivenSizeN cannot be cast to java.util.List at datastructurechapter5.jj.main(jj.java:24) `Collections.sort((List<Integer>) (s));` Java Result: 1 BUILD SUCCESSFUL (total time: 2 seconds)

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  • How to cause AggregateException with TPL?

    - by Sly
    I'm trying to recreate the conditions that will cause this exception: System.AggregateException: A Task's exception(s) were not observed either by Waiting on the Task or accessing its Exception property. As a result, the unobserved exception was rethrown by the finalizer thread.` I wrote this program thinking I'd cause the exception but it does not: using System; using System.Threading.Tasks; namespace SomeAsyncStuff { class Program { static void Main(string[] args) { Task.Factory.StartNew(() => { throw new NullReferenceException("ex"); }); GC.Collect(); Console.WriteLine("completed"); } } } In my real application, I use TPL and I did not code my exception handling right. As a result I get that exception. Now I'm trying to recreate the same conditions in a separate program to experiment with unobserved exceptions.

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