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• mysql-python stopped working

  - by MAC

  This is a rather dumb question but i'am looking at a bizarre situation. I am running fedora and have python 2.6.5 installed. The other day i installed MySQL-python using yum (because i do not have the setuptools module so i cannot build it from source). Anyway yesterday i wrote my entire data access layer in python and it was running fine, i did test it. Today however it gives me an ImportError: No module named MySQLdb The only thing i ever changed was i installed eclipse and pyDev. Any ideas on what went wrong and how i fix it. I tried removing and re-installing MySql-python but that did not help. I did the following import sys print sys.path And it shows me all the paths which are basically pertaining to /usr/local/lib/python2.6 However i was trying to find where the MySQLdb module is installed and it seems that its installed in /usr/lib/python2.5/sitepackages Now i have no idea why it got installed there and why it was working earlier and why it stopped working now. Any ideas on how i should fix it. I did try copying the site-packages folder over to the python2.6 folder but that did not work Help!!

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• PostSharp when using DataContractSerializer?

  - by Dan Bryant

  I have an Aspect that implements INotifyPropertyChanged on a class. The aspect includes the following: [OnLocationSetValueAdvice, MethodPointcut("SelectProperties")] public void OnPropertySet(LocationInterceptionArgs args) { var currentValue = args.GetCurrentValue(); bool alreadyEqual = (currentValue == args.Value); // Call the setter args.ProceedSetValue(); // Invoke method OnPropertyChanged (ours, the base one, or the overridden one). if (!alreadyEqual) OnPropertyChangedMethod.Invoke(args.Location.Name); } This works fine when I instantiate the class normally, but I run into problems when I deserialize the class using a DataContractSerializer. This bypasses the constructor, which I'm guessing interferes with the way that PostSharp sets itself up. This ends up causing a NullReferenceException in an intercepted property setter, but before it has called the custom OnPropertySet, so I'm guessing it interferes with setting up the LocationInterceptionArgs. Has anyone else encountered this problem? Is there a way I can work around it? I did some more research and discovered I can fix the issue by doing this: [OnDeserializing] private void OnDeserializing(StreamingContext context) { AspectUtilities.InitializeCurrentAspects(); } I thought, okay, that's not too bad, so I tried to do this in my Aspect: private IEnumerable<MethodInfo> SelectDeserializing(Type type) { return type.GetMethods(BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.Public).Where( t => t.IsDefined(typeof (OnDeserializingAttribute), false)); } [OnMethodEntryAdvice, MethodPointcut("SelectDeserializing")] public void OnMethodEntry(MethodExecutionArgs args) { AspectUtilities.InitializeCurrentAspects(); } Unfortunately, even though it intercepts the method properly, it doesn't work. I'm thinking the call to InitializeCurrentAspects isn't getting transformed properly, since it's now inside the Aspect rather than directly inside the aspect-enhanced class. Is there a way I can cleanly automate this so that I don't have to worry about calling this on every class that I want to have the Aspect?

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• Qt 5.3 OpenGL - vertex buffer object drawing using the core profile

  - by user3700881

  Im using Qt 5.3 to create a QWindow to do some basic rendering stuff. The QWindow is declared like this: class OpenGLWindow : public QWindow, protected QOpenGLFunctions_3_3_Core { Q_OBJECT ... } It is initialized in the constructor: OpenGLWindow::OpenGLWindow(QWindow *parent) : QWindow(parent) { QSurfaceFormat format; format.setVersion(3,3); format.setProfile(QSurfaceFormat::CoreProfile); this->setSurfaceType(OpenGLSurface); this->setFormat(format); this->create(); _context = new QOpenGLContext; _context->setFormat(format); _context->create(); _context->makeCurrent(this); this->initializeOpenGLFunctions(); ... } And that's the rendering code: void OpenGLWindow::render() { if(!isExposed()) return; _context->makeCurrent(this); glClear(GL_COLOR_BUFFER_BIT); glUseProgram(_shaderProgram); glBindBuffer(GL_ARRAY_BUFFER, _positionBufferObject); glEnableVertexAttribArray(0); glVertexAttribPointer(0, 4, GL_FLOAT, GL_FALSE, 0, 0); glDrawArrays(GL_TRIANGLES, 0, 3); glDisableVertexAttribArray(0); glUseProgram(0); _context->swapBuffers(this); } I am trying to draw a simple triangle using a vertex and fragment shader. The problem is that the triangle is not showing up when the core profile is set. Only when I set the OpenGL version to 2.0 or when I use the compatibility profile, it shows up. From my point of view that doesn't make any sense because I am not using fixed functionality at all. What am I missing?

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• flash as3 document class and event listeners

  - by Lee

  I think i have this document class concept entirly wrong now, i was wondering if someone mind explaining it.. I assumed that the above class would be instantiated within the first frame on scene one of a movie. I also assumed that when changing scenes the state of the class would remain constant so any event listeners would still be running.. Scene 1: I have a movieclip named ui_mc, that has a button in for muting sound. Scene 2: I have the same movie clip with the same button. Now the eventListener picks it up in the first scene, however it does not in the second. I am wondering for every scene do the event listeners need to be resetup? If that is the case if their an event listener to listen for the change in scene, so i can set them back up again lol.. Thanks in advance.. package { import flash.display.MovieClip; import flash.events.MouseEvent; import flash.media.Sound; import flash.media.SoundChannel; public class game extends MovieClip { public var snd_state:Boolean = true; public function game() { ui_setup(); } public function ui_setup():void { ui_mc.toggleMute_mc.addEventListener(MouseEvent.CLICK, snd_toggle); } private function snd_toggle(event:MouseEvent):void { // 0 = No Sound, 1 = Full Sound trace("Toggle"); } } }

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• NSFetchedResultsController secondary sorting not working?

  - by binkly

  Hello, I'm using NSFetchedResultsController to fetch Message entities with Core Data. I want my tableview to group the messages by an attribute called ownerName. This works fine in the sense that I get a proper UI dispalying appropriately named sections. I can achieve this with the code below: NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"ownerName" ascending:NO]; NSArray *sortDescriptors = [[NSArray alloc] initWithObjects:sortDescriptor, nil]; [fetchRequest setSortDescriptors:sortDescriptors]; NSFetchedResultsController *fetchedResultsController = nil; fetchedResultsController = [[NSFetchedResultsController alloc] initWithFetchRequest:fetchRequest managedObjectContext:[appDelegate managedObjectContext] sectionNameKeyPath:@"ownerName" cacheName:@"Messages"] What'd I'd like to do now is have the section with the newest message at the top; exactly how it works with the Messages app on iPhone currently. I've tried adding a second sort descriptor and putting it in an array of sort descriptors and passing that to the fetchRequest but it doesn't appear to be affecting anything. Here is the 2nd sort descriptor that I used. NSSortDescriptor *idDescriptor = [[NSSortDescriptor alloc] initWithKey:@"createdAt" ascending:YES]; If anyone could provide some insight into this I would greatly appreciate it.

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• How to arrange business logic in a Kohana 3 project

  - by Pekka

  I'm looking for advice, tutorials and links at how to set up a mid-sized web application with Kohana 3. I have implemented MVC patterns in the past but never worked against a "formalized" MVC framework so I'm still getting my head around the terminology - toying around with basic examples, building views and templates, and so on. I'm progressing fairly well but I want to set up a real-world web project (one of my own that I've been planning for quite some time now) as a learning object. I learn best by example, but example-based documentation is a bit sparse for Kohana 3 right now - they say so themselves on the site. While I'm not worried about learning the framework as I go along, I want to make sure the code base is healthily structured from the start - i.e. controllers are split nicely, named well and according to standards, and most importantly the business logic is separated into appropriately sized models. My application could, in its core, be described as a business directory with a range of search and listing functions, and a login area for each entry owner. The actual administrative database backend is already taken care of. Supposing I have all the API worked out and in place already - list all businesses, edit business, list businesses by street name, create offer logged in as business, and so on, and I'm just looking for how to fit the functionality into a MVC pattern and into a Kohana application structure that can be easily extended. Do you know real-life examples of "database-heavy" applications like directories, online communities... with a log-in area built on Kohana 3, preferably Open Source so I could take a peek how they do it? Are there conventions or best practices on how to structure an extendable login area for end users in a Kohana project that is not only able to handle a business directory page, but further products on separate pages as well? Do you know any good resources on building complex applications with Kohana? Have you built something similar and could give me recommendations on a project structure?

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• Qt - no such signal error

  - by bullettime

  I'm trying to trigger a signal when a double click happens in one of the draggable widgets on the fridge magnets example. Here's the changes I made to the example source: DragLabel: class DragLabel : public QLabel { public: DragLabel(const QString &text, QWidget *parent); QString labelText() const; public slots: void testSlot(){qDebug()<<"testSlot";} //<-- implemented this slot protected: void mouseDoubleClickEvent(QMouseEvent *ev){emit testSignal();} //<-- overriden this method private: QString m_labelText; signals: void testSignal(); //<-- added this signal }; The only thing I changed in the implementation file is adding connect(this,SIGNAL(testSignal()),this,SLOT(testSlot())); to DragLabel's constructor. Trying to compile the project resulted in 'undefined reference to `DragLabel::testSignal()' and 'collect2: ld returned 1 exit status' errors. When I comment out the call to the signal, it compiles and runs, but gives off 'Object::connect: No such signal QLabel::testSignal() in draglabel.cpp' warning in the application output. Apparently testSignal() isn't being recognized as a signal. What am I missing?

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• Use the repository pattern when using PLINQO generated data?

  - by Chad

  I'm "upgrading" an MVC app. Previously, the DAL was a part of the Model, as a series of repositories (based on the entity name) using standard LINQ to SQL queries. Now, it's a separate project and is generated using PLINQO. Since PLINQO generates query extensions based on the properties of the entity, I started using them directly in my controller... and eliminated the repositories all together. It's working fine, this is more a question to draw upon your experience, should I continue down this path or should I rebuild the repositories (using PLINQO as the DAL within the repository files)? One benefit of just using the PLINQO generated data context is that when I need DB access, I just make one reference to the the data context. Under the repository pattern, I had to reference each repository when I needed data access, sometimes needing to reference multiple repositories on a single controller. The big benefit I saw on the repositories, were aptly named query methods (i.e. FindAllProductsByCategoryId(int id), etc...). With the PLINQO code, it's _db.Product.ByCatId(int id) - which isn't too bad either. I like both, but where it gets "harrier" is when the query uses predicates. I can roll that up into the repository query method. But on the PLINQO code, it would be something like _db.Product.Where(x = x.CatId == 1 && x.OrderId == 1); I'm not so sure I like having code like that in my controllers. Whats your take on this?

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• how can i use gwt-test-utils to work with gin?

  - by krrish

  i tried using the steps in http://code.google.com/p/gwt-test-utils/wiki/HowToUseWithGIN and i'm using testNG but it is giving fallowing error java.lang.ExceptionInInitializerError at com.riskfocus.examples.JsonReaderWriterTest.setupGIN(JsonReaderWriterTest.java:59) 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.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:80) at org.testng.internal.Invoker.invokeConfigurationMethod(Invoker.java:551) at org.testng.internal.Invoker.invokeConfigurations(Invoker.java:213) at org.testng.internal.Invoker.invokeConfigurations(Invoker.java:138) at org.testng.internal.TestMethodWorker.invokeBeforeClassMethods(TestMethodWorker.java:175) at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:107) at org.testng.TestRunner.privateRun(TestRunner.java:768) at org.testng.TestRunner.run(TestRunner.java:617) at org.testng.SuiteRunner.runTest(SuiteRunner.java:334) at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:329) at org.testng.SuiteRunner.privateRun(SuiteRunner.java:291) at org.testng.SuiteRunner.run(SuiteRunner.java:240) at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:53) at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:87) at org.testng.TestNG.runSuitesSequentially(TestNG.java:1185) at org.testng.TestNG.runSuitesLocally(TestNG.java:1110) at org.testng.TestNG.run(TestNG.java:1022) at org.testng.remote.RemoteTestNG.run(RemoteTestNG.java:109) at org.testng.remote.RemoteTestNG.initAndRun(RemoteTestNG.java:202) at org.testng.remote.RemoteTestNG.main(RemoteTestNG.java:173) Caused by: java.lang.UnsupportedOperationException: ERROR: GWT.create() is only usable in client code! It cannot be called, for example, from server code. If you are running a unit test, check that your test case extends GWTTestCase and that GWT.create() is not called from within an initializer or constructor. at com.google.gwt.core.client.GWT.create(GWT.java:91) at com.riskfocus.examples.client.model.StockPriceJsonReaderWriter.<clinit>(StockPriceJsonReaderWriter.java:12) ... 25 more

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• Loading and binding a serialized view model to a WPF window?

  - by generalt

  Hello all. I'm writing a one-window UI for a simple ETL tool. The UI consists of the window, the code behind for the window, a view model for the window, and the business logic. I wanted to provide functionality to the users to save the state of the UI because the content of about 10-12 text boxes will be reused between sessions, but are specific to the user. I figured I could serialize the view model, which contains all the data from the textboxes, and this works fine, but I'm having trouble loading the information in the serialized XML file back into the text boxes. Constructor of window: public ETLWindow() { InitializeComponent(); _viewModel = new ViewModel(); this.DataContext = _viewModel; _viewModel.State = Constants.STATE_IDLE; Loaded += new RoutedEventHandler(MainWindow_Loaded); } XAML: <TextBox x:Name="targetDirectory" IsReadOnly="true" Text="{Binding TargetDatabaseDirectory, UpdateSourceTrigger=PropertyChanged}"/> ViewModel corresponding property: private string _targetDatabaseDirectory; [XmlElement()] public string TargetDatabaseDirectory { get { return _targetDatabaseDirectory; } set { _targetDatabaseDirectory = value; OnPropertyChanged(DataUtilities.General.Utilities.GetPropertyName(() => new ViewModel().TargetDatabaseDirectory)); } Load event in code behind: private void loadState_Click(object sender, RoutedEventArgs e) { string statePath = this.getFilePath(); _viewModel = ViewModel.LoadModel(statePath); } As you can guess, the LoadModel method deserializes the serialized file on the user's drive. I couldn't find much on the web regarding this issue. I know this probably has something to do with my bindings. Is there some way to refresh on the bindings on the XAML after I deserialize the view model? Or perhaps refresh all properties on the view model? Or am I completely insane thinking any of this could be done? Thanks.

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• Design pattern to use instead of multiple inheritance

  - by mizipzor

  Coming from a C++ background, Im used to multiple inheritance. I like the feeling of a shotgun squarely aimed at my foot. Nowadays, I work more in C# and Java, where you can only inherit one baseclass but implement any number of interfaces (did I get the terminology right?). For example, lets consider two classes that implement a common interface but different (yet required) baseclasses: public class TypeA : CustomButtonUserControl, IMagician { public void DoMagic() { // ... } } public class TypeB : CustomTextUserControl, IMagician { public void DoMagic() { // ... } } Both classes are UserControls so I cant substitute the base class. Both needs to implement the DoMagic function. My problem now is that both implementations of the function are identical. And I hate copy-and-paste code. The (possible) solutions: I naturally want TypeA and TypeB to share a common baseclass, where I can write that identical function definition just once. However, due to having the limit of just one baseclass, I cant find a place along the hierarchy where it fits. One could also try to implement a sort of composite pattern. Putting the DoMagic function in a separate helper class, but the function here needs (and modifies) quite a lot of internal variables/fields. Sending them all as (reference) parameters would just look bad. My gut tells me that the adapter pattern could have a place here, some class to convert between the two when necessery. But it also feels hacky. I tagged this with language-agnostic since it applies to all languages that use this one-baseclass-many-interfaces approach. Also, please point out if I seem to have misunderstood any of the patterns I named. In C++ I would just make a class with the private fields, that function implementation and put it in the inheritance list. Whats the proper approach in C#/Java and the like?

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• Methods for Lazy Initialization with properties

  - by Stuart Pegg

  I'm currently altering a widely used class to move as much of the expensive initialization from the class constructor into Lazy Initialized properties. Below is an example (in c#): Before: public class ClassA { public readonly ClassB B; public void ClassA() { B = new ClassB(); } } After: public class ClassA { private ClassB _b; public ClassB B { get { if (_b == null) { _b = new ClassB(); } return _b; } } } There are a fair few more of these properties in the class I'm altering, and some are not used in certain contexts (hence the Laziness), but if they are used they're likely to be called repeatedly. Unfortunately, the properties are often also used inside the class. This means there is a potential for the private variable (_b) to be used directly by a method without it being initialized. Is there a way to make only the public property (B) available inside the class, or even an alternative method with the same initialized-when-needed? This is reposted from Programmers (not subjective enough apparently): http://programmers.stackexchange.com/questions/34270/best-methods-for-lazy-initialization-with-properties

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• WPF Spellcheck Engine takes up too much memory.

  - by Matt H.

  Each datatemplate in my WPF ItemsControl contains FIVE custom bindable richtextbox controls. It is a data-driven app that for authoring multiple-choice questions -- The question and four answer choices must all support: 1) Spell check 2) Rich formatting (otherwise I'd use regular textboxes) The spell check object in .NET 4 has a Friend constructor that takes a single argument of owner As TextBoxBase This means every richtextbox in the ItemsControl has 5 Spellcheck objects! This is the problem -- every spell check engine is consuming about 500k memory. So after you favor in the spellcheck, bindings, additional controls in the DataTemplate, etc.. a single multi choice question consumes more than 3MB memory. Users with 100--200 questions will quickly see the App raise it's memory consumption to 500+ MB. Management is definitely not OK with this. Is there a way to minimimze this problem? The best suggestion I've heard is to enable/disable spellcheck if the richtextbox is in the ItemsControl's scrollviewer: I haven't gotten an answer to how to go about it: (http://stackoverflow.com/questions/2869012/possible-to-implement-an-isviewportvisible-dependencyproperty-for-an-item-in-an-i) Any good ideas?

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• Workaround for basic syntax not being parsed.

  - by Mark Tomlin

  I want to have a class property that allow for an expression to take place on the right side of the equals sign. All versions of PHP choke on the following code, but it is written in this way to allow for easier extendibility in the future. /* Example SDK Class */ class SDK { /* Runtime Option Flags */ // Strings # 0: Makes no change to the strings. var $STRING_NONE = (1 << 0); # 1: Removes color codes from the string. var $STRING_STRIP_COLOR = (1 << 1); # 2: Removes language codes from the string. var $STRING_STRIP_LANG = (1 << 2); # 3: Removes all formatting from the string. var $STRING_STRIP = SELF::STRING_STRIP_COLOR & SELF::STRING_STRIP_LANG; # 4: Converts color codes to HTML & UTF-8. var $STRING_HTML = (1 << 3); # 8: Converts color codes to ECMA-48 escape color codes & UTF-8. var $STRING_CONSOLE = (1 << 4); # 16: Changes player names only. var $STRING_NAMES = (1 << 5); # 32: Changes host names only. var $STRING_HOSTS = (1 << 6); function SDK($fString = SELF::STRING_HTML & SELF::STRING_NAMES & SELF_HOST) { // constructor code. } } $SDK &= new SDK(SDK::STRING_NONE); (1 << 0) seems like very basic syntax to me, and is not fathomable why PHP would not allow for such a thing. Can anyone think of a work around that would maintain readability and future expandability of the following code?

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• PHP: Array of objects is empty when I come to retrieve one from the array

  - by Tom

  Good morning, I am trying to load rows from a database and then create objects from them and add these objects to a private array. Here are my classes: <?php include("databaseconnect.php"); class stationItem { private $code = ''; private $description = ''; public function setCode($code ){ $this->code = $code; } public function getCode(){ return $this->code; } public function setDescription($description){ $this->description = $description; } public function getDescription(){ return $this->description; } } class stationList { private $stationListing; function __construct() { connect(); $stationListing = array(); $result = mysql_query('SELECT * FROM stations'); while ($row = mysql_fetch_assoc($result)) { $station = new stationItem(); $station->setCode($row['code']); $station->setDescription($row['description']); array_push($stationListing, $station); } mysql_free_result($result); } public function getStation($index){ return $stationListing[$index]; } } ?> As you can see I am creating a stationItem object per database row (which for now has a code and description) and I then push these on to the end of my array which is held as a private variable in stationList. This is code which creates this classes and attempts to access the properties on them: $stations = new stationList(); $station = $stations->getStation(0); echo $station->getCode(); I am finding that the sizeof($stationList) at the end of the constructor is 1 but then it is zero when we come to try to get an object from the array using the index. Therefore the error that I get is: Fatal error: Call to a member function getCode() on a non-object Please can someone explain to me why this is happening? I guess I am misunderstanding how object references work in PHP5.

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• Settings module not found deploying django on a shared server

  - by mcanes

  I'm trying to deploy my django project on a shared hosting as describe here I have my project on /home/user/www/testa I'm using this script #!/usr/bin/python import sys, os sys.path.append("/home/user/bin/python") sys.path.append('/home/user/www/testa') os.chdir("/home/user/www/testa") os.environ['DJANGO_SETTINGS_MODULE'] = "settings.py" from django.core.servers.fastcgi import runfastcgi runfastcgi(method="threaded", daemonize="false") And here's the error I get when trying to run it from shell: WSGIServer: missing FastCGI param REQUEST_METHOD required by WSGI! WSGIServer: missing FastCGI param SERVER_NAME required by WSGI! WSGIServer: missing FastCGI param SERVER_PORT required by WSGI! WSGIServer: missing FastCGI param SERVER_PROTOCOL required by WSGI! Traceback (most recent call last): File "build/bdist.linux-i686/egg/flup/server/fcgi_base.py", line 558, in run File "build/bdist.linux-i686/egg/flup/server/fcgi_base.py", line 1118, in handler File "/home/user/lib/python2.4/site-packages/django/core/handlers/wsgi.py", line 230, in __call__ self.load_middleware() File "/home/user/lib/python2.4/site-packages/django/core/handlers/base.py", line 33, in load_middleware for middleware_path in settings.MIDDLEWARE_CLASSES: File "/home/user/lib/python2.4/site-packages/django/utils/functional.py", line 269, in __getattr__ self._setup() File "/home/usr/lib/python2.4/site-packages/django/conf/__init__.py", line 40, in _setup self._wrapped = Settings(settings_module) File "/home/user/lib/python2.4/site-packages/django/conf/__init__.py", line 75, in __init__ raise ImportError, "Could not import settings '%s' (Is it on sys.path? Does it have syntax errors?): %s" % (self.SETTINGS_MODULE, e) ImportError: Could not import settings 'settings.py' (Is it on sys.path? Does it have syntax errors?): No module named settings.py Content-Type: text/html Unhandled Exception Unhandled Exception An unhandled exception was thrown by the application. What am I doing wrong? Running the script from the browser just gives me an internal server error.

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• Add new types to Go

  - by nevalu

  I'm trying add new types for that been managed/used as in Go core types. To create new types is anything very interesting to validate data before of send it to a non-SQL DBMS or to check data from a form. Go uses univeral constants to define them at global level: var DateType = universe.DefineType("date", universePos, &dateType{}) In this case they're defined to be called from a package like types: var Date = &dateType{} I get these errors: test.go:58: o.lit undefined (cannot refer to unexported field lit) test.go:62: *dateType is not Type missing Pos() token.Position The code is based on: http://github.com/tav/go/blob/master/src/pkg/exp/eval/value.go http://github.com/tav/go/blob/master/src/pkg/exp/eval/type.go package main import ( "exp/eval" "fmt" // "go/token" ) // http://github.com/tav/go/blob/master/src/pkg/exp/eval/value.go type DateValue interface { eval.Value Get(*eval.Thread) string Set(*eval.Thread, string) } /* Date */ type dateV string func (v *dateV) String() string { return fmt.Sprint(*v) } func (v *dateV) Assign(t *eval.Thread, o eval.Value) { *v = dateV(o.(DateValue).Get(t)) } func (v *dateV) Get(*eval.Thread) string { return string(*v) } func (v *dateV) Set(t *eval.Thread, x string) { *v = dateV(x) } // http://github.com/tav/go/blob/master/src/pkg/exp/eval/type.go type Type interface { eval.Type // isDate returns true if this is a date type. isDate() bool } /* Common type */ type commonType struct{} // added func (commonType) isDate() bool { return false } /* Date */ type dateType struct { commonType } // * It should not be an universal constant //var universePos = token.Position{"<universe>", 0, 0, 0} // added //var DateType = universe.DefineType("date", universePos, &dateType{}) var Date = &dateType{} func (t *dateType) compat(o Type, conv bool) bool { t2, ok := o.lit().(*dateType) return ok && t == t2 } func (t *dateType) lit() Type { return t } func (t *dateType) isDate() bool { return true } func (t *dateType) String() string { return "<date>" } func (t *dateType) Zero() eval.Value { res := dateV("") return &res } /* Named types */ /* type NamedType struct { eval.NamedType Def Type }*/ type NamedType struct { // added // token.Position Name string // Underlying type. If incomplete is true, this will be nil. // If incomplete is false and this is still nil, then this is // a placeholder type representing an error. Def Type // True while this type is being defined. incomplete bool methods map[string]eval.Method } func (t *NamedType) isDate() bool { return t.Def.isDate() } /* *********************** */ func main() { print("foo") }

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• F# passing an operator with arguments to a function

  - by dan

  Can you pass in an operation like "divide by 2" or "subtract 1" using just a partially applied operator, where "add 1" looks like this: List.map ((+) 1) [1..5];; //equals [2..6] // instead of having to write: List.map (fun x-> x+1) [1..5] What's happening is 1 is being applied to (+) as it's first argument, and the list item is being applied as the second argument. For addition and multiplication, this argument ordering doesn't matter. Suppose I want to subtract 1 from every element (this will probably be a common beginners mistake): List.map ((-) 1) [1..5];; //equals [0 .. -4], the opposite of what we wanted 1 is applied to the (-) as its first argument, so instead of (list_item - 1), I get (1 - list_item). I can rewrite it as adding negative one instead of subtracting positive one: List.map ((+) -1) [1..5];; List.map (fun x -> x-1) [1..5];; // this works too I'm looking for a more expressive way to write it, something like ((-) _ 1), where _ denotes a placeholder, like in the Arc language. This would cause 1 to be the second argument to -, so in List.map, it would evaluate to list_item - 1. So if you wanted to map divide by 2 to the list, you could write: List.map ((/) _ 2) [2;4;6] //not real syntax, but would equal [1;2;3] List.map (fun x -> x/2) [2;4;6] //real syntax equivalent of the above Can this be done or do I have to use (fun x -> x/2)? It seems that the closest we can get to the placeholder syntax is to use a lambda with a named argument.

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• Holding value in collection

  - by Amit Ranjan

  I have a application which is on timesheet. I have total of 54 columns out of which 10 columns are visible rest invisible. First 3 columns are Project, MileStone and Classes. Rest are Sun- Sat work hrs. Now I have a column named 'taskid' as SunTaskID,MonTaskID and so on till SatTaskID for holding each days taskid. Now on the selection of SunHrs (Sunday's Work Hrs), i retrieve that days taskid and on the basis of task id i retrieve attachments which is displayed under a listbox. Now the problem is that since a day can have multiple attachments and a user can attach multiple attachments at time. He can enter values from grid to. Grid cells are editable. I am using BindingList(of TaskClass) in VB.Net for binding grid. I have total 54 properties n my task class. So i want to what property do i need to hod each days attachment and in what way. Earlier I tried Dictionary. But i was not aware of its usage as a property so i gave. Then prepared a separate class for attachment but, it was difficult to synchronize the existing attachments with taskid...

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• Spring security with GAE

  - by xybrek

  I'm trying to implement Spring security for my GAE application however I'm getting this error: No bean named 'springSecurityFilterChain' is defined I added this configuration on my application web.xml: <filter> <filter-name>springSecurityFilterChain</filter-name> <filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class> </filter> <filter-mapping> <filter-name>springSecurityFilterChain</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> And in the servlet-context: <!-- Configure security --> <security:http auto-config="true"> <security:intercept-url pattern="/**" access="ROLE_USER" /> </security:http> <security:authentication-manager alias="authenticationManager"> <security:authentication-provider> <security:user-service> <security:user name="jimi" password="jimi" authorities="ROLE_USER, ROLE_ADMIN" /> <security:user name="bob" password="bob" authorities="ROLE_USER" /> </security:user-service> </security:authentication-provider> </security:authentication-manager> What could be causing the error?

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• How to use delegate to perform callback between caller and web service helper class?

  - by codemonkie

  I have 2 classes A and B, where they belongs to the same namespace but resides in seperate files namely a.cs and b.cs, where class B essentially is a helper wrapping a web service call as follow: public class A { public A() // constructor { protected static B b = new B(); } private void processResult1(string result) { // come here when result is successful } private void processResult2(string result) { // come here when result is failed } static void main() { b.DoJobHelper(...); } } public class B { private com.nowhere.somewebservice ws; public B() { this.ws = new com.nowhere.somewebservice(); ws.JobCompleted += new JobCompletedEventHandler(OnCompleted); } void OnCompleted(object sender, JobCompletedEventArgs e) { string s = e.Result; Guid taskID = (Guid)e.UserState; switch (s) { case "Success": // Call processResult1(); break; case "Failed": // Call processResult2(); break; default: break; } } public void DoJobHelper() { Object userState = Guid.NewGuid(); ws.DoJob(..., userState); } } (1) I have seen texts on the net on using delegates for callbacks but failed to apply that to my case. All I want to do is to call the appropriate processResult() method upon OnCompleted() event, but dunno how to and where to declare the delegate: public delegate void CallBack(string s); (2) There is a sender object passed in to OnCompleted() but never used, did I miss anything there? Or how can I make good use of sender? Any helps appreciated.

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• Why did i get this error?

  - by David

  here's the code: class Acount { int sum ; String owner ; //these seem to make sense //a constructor or two public Acount () { this.sum = 0 ; this.owner = "John Doe" ; } public Acount (String name) {this.sum = 0 ; this.owner = name ; } public Acount (String name, int sum) {this.sum = sum ; this.owner = name ; } //prints an acount in the format "owner" "sum" public static void printAcount (Acount Acount) {System.out.print (Acount.owner) ; System.out.print (" ") ; System.out.println (Acount.sum) ; } public static void main (String[]arg) { Acount Acount1 = new Acount ("david", 100) ; System.out.println ("heres the first acount as it was created:") ; printAcount (Acount1) ; System.out.println ("now i changed one of its instance varaibles with a static method") ; upOne (Acount1) ; printAcount (Acount1) ; } public static Acount upOne (Acount Acount) { Acount.sum = Acount.sum + 1 ; return Acount ; } } here's the error: Exception in thread "main" java.lang.NoClassDefFoundError: Acount/java What went wrong?

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• Parsing tnsnames.ora using regex...

  - by Welton v3.50

  I am attempting to pull some information from my tnsnames file using regex. I started with the following pattern: MYSCHEMA *? = *?[\W\w\S\s]*\(HOST *?= *?(?<host>\w+\s?)\)\s?\(PORT *?= *?(?<port>\d+)\s?\)[\W\w\S\s]*\(SERVICE_NAME *?= *?(?<servicename>\w+)\s?\) which worked fine when MYSCHEMA was the only schema in the file, but when there are other schemas listed after MYSCHEMA it matches all the way to the last schema. I have since created a new pattern: MYSCHEMA *=\s*\(DESCRIPTION =\s*\(ADDRESS *= *\(PROTOCOL *= *TCP\)\(HOST *= *(?<host>\w+)\)\(PORT *= *(?<port>\d+)\)\)\s*\(CONNECT_DATA *=\s*(?<serverdedicated>\(SERVER *= *DEDICATED\))\s*\(SERVICE_NAME *= *(?<servicename>[\w\.]+) *\)\s*\)\s*\) This pattern matches MYSCHEMA only, but I had to add every element that appeared in MYSCHEMA entry, and it won't match MYOTHERSCHEMA if it does not contain all the same elements. Ideally, I'd like a pattern that matches MYSCHEMA entry only, and captures HOST, PORT and SERVICE NAME, and optionally (SERVER = DEDICATED) (which I didn't have in the first pattern) to named groups. Below is the sample tnsnames that I've been using for testing: SOMESCHEMA = (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = REMOTEHOST)(PORT = 1234)) ) (CONNECT_DATA = (SERVICE_NAME = REMOTE) ) ) MYSCHEMA = (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = MYHOST)(PORT = 1234)) (CONNECT_DATA = (SERVER = DEDICATED) (SERVICE_NAME = MYSERVICE.LOCAL ) ) ) MYOTHERSCHEMA = (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = MYHOST)(PORT = 1234)) ) (CONNECT_DATA = (SERVICE_NAME = MYSERVICE.REMOTE) ) ) SOMEOTHERSCHEMA = (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = LOCALHOST)(PORT = 1234)) ) (CONNECT_DATA = (SERVICE_NAME = LOCAL) ) )

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• c# CF Restart a thread

  - by Ed

  Hi all, Supose you have a form with a button that starts/stops a thread (NOT pausing or interrupting, I really need to stop the thread !) Check out this code: Constructor() { m_TestThread = new Thread(new ThreadStart(ButtonsThread)); m_bStopThread = false; } ButtonClick { // If the thread is not running, start it m_TestThread.Start(); // If the thread is running, stop it m_bStopThread = true; m_TestThread.Join(); } ThreadFunction() { while(!m_bStopThread) { // Do work } } 2 questions (remember CF): - How can I know if the thread is running (I cannot seem to access the m_pThreadState, and I've tried the C++ GetThreadExitCode(), it give false results) ? - Most important question : if I have stopped the thread, I cannot restart it, most probably because the m_TestThread.m_fStarted is still set (and it is private so I cannot access it) ! And thus m_TestThread.Start() generates an exception (StateException). Stopping the thread with an Abort() doesn't solve it. If I put my m_TestThread = null; it works, but then I create a memory leak. The GC doesn't clean up either, even if I wait for xx seconds. Anybody has an idea ? All help highly appreciated ! Grtz E

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• Django and Google App Engine Helper not finding the ipaddr module.

  - by Phil

  I'm trying to get Django running on GAE using this tutorial. When I run python manage.py runserver I get the stacktrace below. I'm new to both django and python so I don't know what my next steps are (This is Ubuntu Jaunty btw). It seems django isn't finding the GAE module ipaddr which comes with SDK 1.3.1. How do I get django to find this module? /home/username/bin/google_appengine/google/appengine/api/datastore_file_stub.py:40: DeprecationWarning: the md5 module is deprecated; use hashlib instead import md5 /home/username/bin/google_appengine/google/appengine/api/memcache/__init__.py:31: DeprecationWarning: the sha module is deprecated; use the hashlib module instead import sha Traceback (most recent call last): File "manage.py", line 18, in <module> InstallAppengineHelperForDjango() File "/home/username/Development/GAE/myapp/appengine_django/__init__.py", line 543, in InstallAppengineHelperForDjango InstallDjangoModuleReplacements() File "/home/username/Development/GAE/myapp/appengine_django/__init__.py", line 260, in InstallDjangoModuleReplacements import django.db File "/home/username/Development/GAE/myapp/django/db/__init__.py", line 57, in <module> 'TIME_ZONE': settings.TIME_ZONE, File "/home/username/Development/GAE/myapp/appengine_django/db/base.py", line 117, in __init__ self._setup_stubs() File "/home/username/Development/GAE/myapp/appengine_django/db/base.py", line 128, in _setup_stubs from google.appengine.tools import dev_appserver_main File "/home/username/bin/google_appengine/google/appengine/tools/dev_appserver_main.py", line 82, in <module> from google.appengine.tools import appcfg File "/home/username/bin/google_appengine/google/appengine/tools/appcfg.py", line 53, in <module> from google.appengine.api import dosinfo File "/home/username/bin/google_appengine/google/appengine/api/dosinfo.py", line 25, in <module> import ipaddr ImportError: No module named ipaddr

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