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• Python imaging alternatives

  - by Paul McMillan

  I have python code that needs to do just a couple simple things to photographs: crop, resize, and overlay a watermark. I've used PIL, and the resample/resize results are TERRIBLE. I've used imagemagick, and the interface and commands were designed by packaging a cat in a box, and then repeatedly throwing it down a set of stairs at a keyboard. I'm looking for something which is not PIL or Imagemagick that I can use with python to do simple, high-quality image transformations. For that matter, it doesn't even have to have python bindings if the command line interface is good. Oh, and it needs to be relatively platform agnostic, our production servers are linux, but some of our devs develop on windows. It can't require the installation of a bunch of silly gui code to use as a library, either.

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• java-COM interop: Implement COM interface in Java

  - by mdma

  How can I implement a vtable COM interface in java? In the old days, I'd use the Microsft JVM, which had built in java-COM interop. What's the equivalent for a modern JRE? Answers to a similar SO question proposed JACOB. I've looked at JACOB, but that is based on IDispatch, and is aimed at controlling Automation serers. The COM interfaces I need are custom vtable (extend IUnknown), e.g. IPersistStream, IOleWindow, IContextMenu etc. For my use case, I could implement all the COM specifics in JNI, and have the JNI layer call corresponding interfaces in java. But I'm hoping for a less painful solution. It's for an open source project, so open source alternatives are preferred.

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• Purpose of Zope Interfaces?

  - by Nikwin

  I have started using Zope interfaces in my code, and as of now, they are really only documentation. I use them to specify what attributes the class should possess, explicitly implement them in the appropriate classes and explicitly check for them where I expect one. This is fine, but I would like them to do more if possible, such as actually verify that the class has implemented the interface, instead of just verifying that I have said that the class implements the interface. I have read the zope wiki a couple of times, but still cannot see much more use for interfaces than what I am currently doing. So, my question is what else can you use these interfaces for, and how do you use them for more.

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• Add UIBarButtonItem in interface builder, how to?

  - by Martin

  I have a navigation based application that have a uinavigataioncontroller containing uitableviewcontrollers. I want to add buttons to the UINavigationbar of the uinavigataioncontroller, usually I write code to add these buttons, something like this: UIBarButtonItem *saveButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemSave target:self action:@selector(saveClicked:)]; self.navigationItem.rightBarButtonItem = saveButton; [saveButton release]; My idea now was to use interface builder instead. But I'm not sure how to do it. What I'm trying to do is to add a UINavigationItem in the xib file of the viewcontroller (my viewcontroller is called TextViewController), something like this: See this image: http://i48.tinypic.com/qq5yk7.jpg But how can I make TextViewController use the UINavigationItem I added? The button I add doesn't show in the navigationbar. Any ideas on how to do this? What am I missing?

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• Reducing differences in xibs

  - by tewha

  I've been noticing superfluous changes in my xib files with Interface Builder 3.2.1. Here are a few of them: - <reference key="NSNextResponder"/> + <nil key="NSNextResponder"/> - <reference key="NSSuperview"/> - <array class="NSMutableArray" key="IBDocument.EditedObjectIDs"> - <integer value="6"/> - </array> + <array class="NSMutableArray" key="IBDocument.EditedObjectIDs"/> Can anyone tell me what these are, and are there any tricks for avoiding them? I'd prefer my checkins to only describe changes I intentionally made. Update: I wasn't clear in the original question, but these differences were caused by opening the file in Interface Builder and saving it without making a change.

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• USB interface barcode scanners

  - by Nimbuz

  Not exactly a programming question, but close. I'll try my luck anyway. The keyboard wedge barcode scanner inserts the translation device between the reader and the keyboard. Data sent through a wedge appears as if it was typed into the computer, while the keyboard itself remains fully functional. Because a computer using a keyboard wedge can't tell the difference between data that is entered by a scanning device, or data that is entered by keyboard typing, a wedge can be used to easily add barcode reading capability to an existing computer without modifying software applications. I'd like to know if all USB interface barcode scanners automatically translate digital signals from a barcode reader into keyboard strokes for a applications just like wedge or is USB different from wedge? Many thanks

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• DOS batch file to enter commands in proprietary java app and receive feedback?

  - by Justine

  Hello, I'm working on a project in which I'd like to be able to turn lights on and off in the Duke Smart Home via a high frequency chirp. The lighting system is called Clipsal Square-D and the program that gives a user access to the lighting controls is called CGate. I was planning on doing some signal processing in Matlab, then create a batch file from Matlab to interact with Cgate. Cgate is a proprietary Java app that, if run from a DOS command line, opens up another window that looks like the command prompt. I have a batch file that can check to see if Cgate is running and if not, open it. But what I can't figure out how to do is actually run commands in the Cgate program from the batch file and likewise, take the response from Cgate. An example of such a command is "noop," which should return "200 OK." Any help would be much appreciated! Thank you very much in advance :) (here's my existing batch file by the way) @ECHO off goto checkIfOpen :checkIfOpen REM pv finds all open processes and puts it in result.txt %SystemRoot%\pv\pv.exe %SystemRoot%\pv\pv.exe result.txt REM if result has the word notepad in it then notepad is running REM if not then it opens notepad FIND "notepad.exe" result.txt IF ERRORLEVEL 1 START %SystemRoot%\system32\Clipsal\C-Gate2\cgate.exe goto end :end

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• JAXB, Netbeans and Interface Insertion Plugin

  - by segolas

  Hi, I can't get my generated classes to implements any interface. This is my xml schema file: xmlns:jxb="http://java.sun.com/xml/ns/jaxb/" xmlns:ai="http://jaxb.dev.java.net/plugin/if_insertion" jxb:extensionBindingPrefixes="ai" <xs:element name="header"> <xs:annotation> <xs:appinfo> <ai:interfaces check="1"> utility.RuleInterface </ai:interfaces> </xs:appinfo> </xs:annotation> <xs:complexType> bla bla bla </xs:complexType> I checked the "Extension" option in the JAXB options and I hav added the xjc-if-ins.jar to the "Libraries" section of my project Properties. But the generated Header class doesn't implements the utility.RuleInterface. I can figure out what am I doing wrong... Is it something missing? Any idea? regards, Segolas

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• IBOutlet UILabel do not get resized

  - by Leonardo

  HI all, I have designed a view in Interface Builder and connected correctly with its controller. There some UILabel in it that are going to be filled with lot of text. But, even if I have declared "word wrap" and set line to 0 in IB, I can display only first line. I notice that if I increase the height of the UILabel in IB, all the text display properly in multi line, but I cannot do that because text may vary. Shouldn't the UILabel resize itself to fit all the text ? Also, if I built the UILabel programmatically I can succesfully accomplish a word wrap, why cannot do the same with IB ? What am I doing wrong ? thanks Leonardo

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• Java Memory Overhead

  - by flamealpha

  Hello, I would like to ask about Memory Overhead in java, I have a large ArrayList (61,770 items), and trying to calculate the amount of memory taken by each item (counting the object and its ArrayList entry), by profiling the app i get that after all the data is loaded, the heap takes ~ 25Mb. when the ArrayList has only 2 items the heap takes ~1Mb , so roughly: (24*1024*1024)/61,768 = 407 bytes. however, when i count the fields of the each object, i get 148 bytes(not including the ArrayList, and assuming int=4,float=4,reference=4), I am curious to know where did all of those extra bytes came from... i can guess that since the objects I store in the ArrayList are implementing an interface, they store extra values, maybe the VM stores a 4byte function pointer for each implemented method? the interface they implement have 20 functions so thats 80 more bytes, totaling 228 bytes, still not close to the 400 bytes measured. any help would be appreciated.

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• Sharing output streams through a JNI interface

  - by Chris Conway

  I am writing a Java application that uses a C++ library through a JNI interface. The C++ library creates objects of type Foo, which are duly passed up through JNI to Java. Suppose the library has an output function void Foo::print(std::ostream &os) and I have a Java OutputStream out. How can I invoke Foo::print from Java so that the output appears on out? Is there any way to coerce the OutputStream to a std::ostream in the JNI layer? Can I capture the output in a buffer the JNI layer and then copy it into out?

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• Computer Vision application(+web interface) for face detection and recognition from database

  - by Kush

  My project is a computer vision java application which should implement the following : A web interface through which the form entry+images(for example a student data) will be stored into a database(Mysql) & images into directory common to my java application. Then the data & images can be retrieved from my java Gui application and I can perform the following operations of image processing through OpenCV. Actually,I want to run the face detection on images retrieved and discard the false entries(no proper face). Also the application user/admin can search an image based on text search(By Id) or By another reference image using face recognition. I am well familiar with Java but the problem is that I need a guidance on how to organise it in a stepwise manner(links appreciated).OpenCv,Php and mySql are really messy.I know doing the openCV stuff within java is real overhead but i really want to do it.But If there is any suggestion to do it elseway please guide me.So any kind of help is a ray of hope for me. Thanks.

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• Continuation monad "interface"

  - by sdcvvc

  The state monad "interface" class MonadState s m where get :: m s put :: s -> m () (+ return and bind) allows to construct any possible computation with State monad without using State constructor. For example, State $ \s -> (s+1, s-1) can be written as do s <- get put (s-1) return (s+1) Similarily, I never have to use Reader constructor, because I can create that computation using ask, return and (>>=). Precisely: Reader f == ask >>= return . f. Is it the same true for continuations - is it possible to write all instances of Cont r a using callCC (the only function in MonadCont), return and bind, and never type something like Cont (\c -> ...)?

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• SQL 2005 Express Edition - Install new instance

  - by Douglas Anderson

  Looking for a way to programatically, or otherwise, add a new instance of SQL 2005 Express Edition to a system that already has an instance installed. Traditionally, you run Micrsoft's installer like I am in the command line below and it does the trick. Executing the command in my installer is not the issue, it's more a matter of dragging around the 40 MBs of MS-SQL installer that I don't need if they have SQL Express already installed. This is what my installer currently executes: SQLEXPR32.EXE /qb ADDLOCAL=ALL INSTANCENAME=<instancename> SECURITYMODE=SQL SAPWD=<password> SQLAUTOSTART=1 DISABLENETWORKPROTOCOLS=0 I don't need assistance with launching this command, rather the appropriate way to add a new instance of SQL 2005 Express without actually running the full installer again. I'd go into great detail about why I want to do this but I'd simply bore everyone. Suffice to say, having this ability to create a new instance without the time it takes to reinstall SQL Express etc. would greatly assist me for the deployment of my application and it's installer. If makes any difference to anyone, I'm using a combination of NSIS and Advanced Installer for this installation project.

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• How to build an interactive search engine web interface using python

  - by asmaier

  I have build a static web interface for searching data from some tables in my PostgreSQL database. The query website consists of a simple textfield for entering the search term, the result website presents the results as a simple html table. The server side code for searching the PostgreSQL database and returning the results is written in python using psycopg2. Now I would like to add some interactive "Ajax features" to my search engine. When entering the search term I would like to be able to see a list of possible search terms like Google does it. On the results page, I would like to be able to sort the table showing the results. What would be the easiest/recommended way to implement these features for my search engine web site? Do I need a full-fledged web framework like Django for that?

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• Alternative to COM blind aggregation in .NET for class with private interface

  - by Philip

  When extending a COM class in unmanaged C++ where the original class has private interfaces, one way to do this is through the concept of blind aggregation. The idea is that any interface not explicitly implemented on the outer aggregating class is 'blindly' forwarded to the inner aggregated class. Now .NET as far as I can figure out does not support COM aggregation natively. A somewhat tedious workaround is to create a .NET class where you implement all the required COM interfaces directly on the .NET class and simply forward to an instance of the actual COM class for any methods you don't want to override. The problem I have is when the original COM object has one or more private interfaces, i.e. undocumented interfaces that are nonetheless used by some consumers of the original class. Using blind aggregation in unmanaged C++ this is a non-issue as the calls to the private interfaces are automatically forwarded to the original class, however I can't find any way of doing the same thing in .NET. Are there any other ways of accomplishing this with .NET?

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• Self documenting REST interface

  - by KandadaBoggu

  I have a Rails based server running several REST services and a Rails based web UI that interacts with the server using ActiveResource. Same server is being used by other clients( e.g: mobile). I have to generate documentation for the REST interface. I need to provide service URL, input/output and error document structure for each service. Ideally, I would like to use an interceptor at the server side that will document the service based on the existing traffic. I am wondering if there is a gem to do this.

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• WCF Service and Properties

  - by Karnalta

  Hi all, Here is my question, I have a solution with 4 projects in it for a WCF Service : DLL Library : Service Interface. DLL Library : Service Code. Form Application : Service hosting application. Form Application : Service client application. I'd like to have certain properties of the service accessible for the hosting application but not for the client one. If I declare a property in the client interface they will both have access to it. In fact, my service manage user identity login and keep a list of all user currently logged in. I'd like to be able to show this list in the Hosting application, like a debugging tool. But I don't want the service client to be able to access to this list. How can I do ? Thank in advance.

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• Using Interfaces in action signature

  - by Dmitry Borovsky

  Hello, I want to use interface in Action signature. So I've tried make own ModelBinder by deriving DefaultModelBinder: public class InterfaceBinder<T> : DefaultModelBinder where T: new() { protected override object CreateModel(ControllerContext controllerContext, ModelBindingContext bindingContext, Type modelType) { return base.CreateModel(controllerContext, bindingContext, typeof(T)); } } public interface IFoo { string Data { get; set; } } public class Foo: IFoo /*other interfaces*/ { /* a lot of */ public string Data { get; set; } } public class MegaController: Controller { public ActionResult Process( [ModelBinder(typeof(InterfaceBinder))]IFoo foo){/bla-bla-bla/} } But it doesn't work. Does anybody have idea how release this behaviour? And yes, I know that I can make my own implementation of IModelBinder, but I'm looking for easier way.

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• Django admin interface upload failing on request data read error

  - by Jake

  Hi All, This is an updated version of an old question I asked. I've now done a lot more testing, plus the old question got hijacked. I'm getting a request data read error when trying to upload files to the Django admin interface. Files under about 150k work, but bigger files always fail and almost always at around 192k (that's 3 chunks) completed, sometimes at around 160k. The Exception I get is below. File "/usr/lib/python2.4/site-packages/django/http/multipartparser.py", line 405, in read return self._file.read(num_bytes) IOError: request data read error I've tried Chrome and Firefox on Windows and Firefox on Mac - Same results. I can upload to other sites so I don't think it's my connection. I'm running python 2.4, django 1.1, mod_wsgi, on CentOS (a media temple DV server) Locally it's fine (Django development server) Everything I've found on this issue says it's a mod_python issue and that changing to mod_wsgi will fix it, but I am running mod_wsgi. Can anyone help?

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• How to convert an existing callback interface to use boost signals & slots

  - by the_mandrill

  I've currently got a class that can notify a number of other objects via callbacks: class Callback { virtual NodulesChanged() =0; virtual TurkiesTwisted() =0; }; class Notifier { std::vector<Callback*> m_Callbacks; void AddCallback(Callback* cb) {m_Callbacks.push(cb); } ... void ChangeNodules() { for (iterator it=m_Callbacks.begin(); it!=m_Callbacks.end(); it++) { (*it)->NodulesChanged(); } } }; I'm considering changing this to use boost's signals and slots as it would be beneficial to reduce the likelihood of dangling pointers when the callee gets deleted, among other things. However, as it stands boost's signals seems more oriented towards dealing with function objects. What would be the best way of adapting my code to still use the callback interface but use signals and slots to deal with the connection and notification aspects?

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• dynamic dashboard interface

  - by user208081

  I want to create an interface similar to the following in Silverlight. http://demos6.dundas.com/Silverlight/ I need to create a dashboard where different elements can be re-arranged using Silverlight. The dashboard elements can be different usercontrols that in turn may contain charts, guages, grids...... The user should be able to dynamically add and remove dashboard elements. The user should also be able to use drag and drop to reposition the dashboard elements. If there are some code samples to get me started, that will be great as we are just starting out on some Silverlight development. Thanks, Pratik

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• FireBug - inspect element problem -- showing different interface?

  - by Susan

  When I used to use Firebugs inspect elements feature it displayed the results like this below. Nice, nested tags on the left...css style on the right. Recently, however, when I try to inspect elements it always shows this: I've tried reverting to older versions of FireBug (can't remember if it started after an update?).. I've poked around the settings... Can't find why it's different. The interface it's showing now is completely useless for figuring out what's going on in the html / css.

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• Using Interfaces in JNI

  - by lhw

  I am trying to use (*env)->RegisterNatives to add methods to a defined class which I then add to a callback list. The callback sender of course expects my class to implement a certain interface which I do not. And is failing on execution. If I add the keyword "implements Listener" to my class in Java the javac expects to have the methods definition in Java or with native keyword which I try to avoid here, as I'd like to register the methods within the JNI_OnLoad and execute one of them afterwards. The question now is: Can I implement the interface in JNI or avoid the error message in Java?

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• Subsonic 3.0 - .Net - Error : Can not ceate an instance of an interface

  - by George

  Hi, I am new to Subsonic, I have configured Subsonic3.0 T4 Template and created classes for my project. I have taken GridView and Object Datasource. Object datasource will connect to the one of the classes which is created from subsonic. I have set object datasource for g\fetch, Insert, Update and delete methods. Then i set the datasource of grid witht he object datasource. Grid view successfully showing me all the records. But at the time of Update, Insert or delete it throws an exception that "Can not ceate an instance of an interface". And also i am not able to dwbug in the code of the subsonic. May be because of partial classes. Can anyone please let me know what is happening at the backgrund? Or may be one can give me sample example which contains subsonic 3.0 and grid add, edit and delete so it will be really helpful for me.... Please... :) Thanks, George

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