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• What's the correct way to stop a background process on Mac OS X?

  - by mcsheffrey

  I have an application with 2 components: a desktop application that users interact with, and a background process that can be enabled from the desktop application. Once the background process is enabled, it will run as a user launch agent independently of the desktop app. However, what I'm wondering is what to do when the user disables the background process. At this point I want to stop the background process but I'm not sure what the best approach is. The 3 options that I see are: Use the 'kill' command. Direct, but not reliable and just seems somewhat "wrong". Use an NSMachPort to send an exit request from the desktop app to the background process. This is the best approach I've thought of but I've run into an implementation problem (I'll be posting this in a separate query) and I'd like to be sure that the approach is right before going much further. Something else??? Thank you in advance for any help/insight that you can offer.

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• Unique serial number in a java web application.

  - by Zenzen

  I've been wondering what's the correct practice for generating unique ids? The thing is in my web app I'll have a plugin system, when a user registers a plugin I want to generate a unique serial ID for it. I've been thinking about storing all numbers in a DB or a file on the server, generating a random number and checking whether it already exists in the DB/file, but that doesn't seem that good. Are there other ways to do it? Would using the UUID be the preferred way to go?

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• Temporarily disabled NSArrayController filterPredicate, or consult ManagedObjectContext?

  - by ndg

  I have an NSArrayController which is bound to a class in my Managed Object Context. During runtime the NSArrayController can have a number of different filter predicates applied. At certain intervals, I want to iterate through my NSArrayController's contents regardless of the filter predicate applied to it. To do this, I set the filterPredicate to nil and then reinstate it after having iterated through my array. This seems to work, but I'm wondering if it's best practice? Should I instead be polling my Managed Object Context manually? NSPredicate *predicate = nil; predicate = [myArrayController filterPredicate]; [myArrayController setFilterPredicate:nil]; for(MyManagedObject *object in [myArrayController arrangedObjects]) { // ... } [myArrayController setFilterPredicate:predicate];

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• Design issue with ATG CommercePipelineManager

  - by user1339772

  The definition of runProcess() method in PipelineManager is public PipelineResult runProcess(String pChainId, Object pParam) throws RunProcessException This gives me an impression that ANY object can be passed as the second param. However, ATG OOTB has PipelineManager component referring to CommercePipelineManager class which overrides the runProcess() method and downcast pParam to map and adds siteId to it. Basically, this enforces the client code to send only Map. Thus, if one needs to create a new pipeline chain, has to use map as data structure to pass on the data. Offcourse, one can always get around this by creating a new PipelineManager component, but I was just wondering the thought behind explicitly using map in CommercePipelineManager

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• Adding hover trigger from another div

  - by jakeprzespo

  I am trying to activate the native hover effect of a div from another div. I understand that I could do this all in jQuery and add the styles in there, but would rather leave the native :hover in the CSS. I'm just wondering if there is a way for this to work: $("#div1").live("mouseenter", function() { $("#div2").trigger("mouseenter"); }); I'd like to call it by doing something like this, but it isn't working. Is there really no way to trigger an event from another element's event? Thanks in advance.

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• what's the "best" approach to creating the UI of an audio plugin that will be both audio unit and VST for OS X and Windows?

  - by SaldaVonSchwartz

  I'm working on a couple audio plugins. Right now, they are audio units. And while the "DSP" code won't change for the most part between implementations / ports, I'm not sure how to go about the GUI. For instance, I was looking at the Apple-supplied AUs in Lion. Does anyone know how did they go about the UI? Like, are the knobs and controls just subclasses of Cocoa controls? are they using some separate framework or coding these knobs and such from scratch? And then, the plugs I'm working on are going to be available too as VSTs for Windows. I already have them up and running with generic interfaces. But I'm wondering if I should just get over it and recreate all my interfaces with the vstgui code provided by Steinberg or if there's a more practical approach to making the interfaces cross-platform.

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• Uploadify and Image Compression

  - by Ilya Biryukov

  Hi, I am using Uploadify on one of my client's web sites to allow them to upload a large amount of pictures at once to their photo gallery. I am seeing issues lately. They seem to upload large photographs (3 MB and above). I am wondering, is it possible to compress (reduce their size) on the client side, instead of doing it on the server (just like facebook does it). I know I could easily do it on the server, but I am working on another project right now, where I am expecting a large flow of photo uploads. It would require significant amount of CPU time to process them all. So I thought, I'd ask about the client side processing. Thanks.

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• Style question: Writing "this." before instance variable and methods: good or bad idea?

  - by Uri

  One of my nasty (?) programming habits in C++ and Java is to always precede calls or accesses to members with a this. For example: this.process(this.event). A few of my students commented on this, and I'm wondering if I am teaching bad habits. My rationale is: 1) Makes code more readable — Easier to distinguish fields from local variables. 2) Makes it easier to distinguish standard calls from static calls (especially in Java) 3) Makes me remember that this call (unless the target is final) could end up on a different target, for example in an overriding version in a subclass. Obviously, this has zero impact on the compiled program, it's just readability. So am I making it more or less readable? Related Question Note: I turned it into a CW since there really isn't a correct answer.

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• Search and highlight - Client vs. Server side?

  - by OneDeveloper

  Hi everyone, I have an MVC web application that shows ~ 2000 lines "divs", and I want to make the user able to search and highlight the keywords. I tried using jQuery plugins for this but the performance was really bad and IE got almost hung! So, I was wondering if this is the best way to do it? and If am not getting a faster version I'd rather do it on the server "AJAX call" and re-render the whole lines again - this way at least the user won't feel the browser is getting hung! Any recommendations? Thanks!

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• Using Range Function

  - by Michael Alexander Riechmann

  My goal is to make a program that takes an input (Battery_Capacity) and ultimately spits out a list of the (New_Battery_Capacity) and the Number of (Cycle) it takes for it ultimately to reach maximum capacity of 80. Cycle = range (160) Charger_Rate = 0.5 * Cycle Battery_Capacity = float(raw_input("Enter Current Capacity:")) New_Battery_Capacity = Battery_Capacity + Charger_Rate if Battery_Capacity < 0: print 'Battery Reading Malfunction (Negative Reading)' elif Battery_Capacity > 80: print 'Battery Reading Malfunction (Overcharged)' elif float(Battery_Capacity) % 0.5 !=0: print 'Battery Malfunction (Charges Only 0.5 Interval)' while Battery_Capacity >= 0 and Battery_Capacity < 80: print New_Battery_Capacity I was wondering why my Cycle = range(160) isn't working in my program?

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• SSIS Custom Control Task Debugging UI in BIDS and VS

  - by zeencat

  I've created a SSIS Custom Task in C# and I'm currently developing the UI. I was wondering if there is a better way of debugging the UI instead of compiling the project, copying the DLL's into the appropriate DTS folder and then opening the test Package within BIDS and then attaching the process to Visual Studio. This part I'm not bothered about but once you've tested the UI and made changes to UI within Visual Studio. I've got to recomplile the DLL's and then repeat the entire process. I've got to close BIDS and VS because they don't release the DLL's before I have to start the entire process over again. Does anyone have any tips to speed up this process. It's just so frustrating having to do this everytime.

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• Exception Handling in MVP Passive View

  - by ilmatte

  Hello, I'm wondering what's the preferred way to manage exceptions in an MVP implemented with a Passive View. There's a discussion in my company about putting try/catch blocks in the presenter or only in the view. In my opinion the logical top level caller is the presenter (even if the actual one is the view). Moreover I can test the presenter and not the view. This is the reason why I prefer to define a method in the view interface: IView.ShowError(error) and invoke it from the catch blocks in the presenter: try { } catch (Exception exception) { ...log exception... view.ShowError("An error occurred") } In this way the developers of future views can safely forget to implement exception handling but the IView interface force them to implement a ShowError method. The drawback is that if I want to feel completely safe I need to add redundant try/catch blocks in the view. The other way would be to add try catch blocks only in the views and not introducing the showerror method in the view interface. What do you suggest?

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• Caching instances in a jee web app

  - by SibzTer

  Hi, Consider the scenario of a typical webapp with JSFs on the front and ejb3, with Hibernate as JPA provider, talking to backend database such as mysql, etc. The main user actions are login and mostly CRUD operations (minus any D(elete) operations). And the App Server is GlassFish of course. Given this scenario, how and where all would one go about providing caching to improve performance? From what I have googled, I have seen that hibernate provides some sort of caching through different cache providers. Is there any sort of caching that can be provided for the jsf pages? How about session beans or entity beans on the ejb side of things? Also, I just read about memcached and was wondering if this was something to consider?

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• Using Linq to select a range of members in a list

  - by clintp

  Given a list of elements like so: int[] ia = new int[] { -4, 10, 11, 12, 13, -1, 9, 8, 7, 6, 5, 4, -2, 6, 15, 32, -5, 6, 19, 22 }; Is there an easy way in Linq to do something along the lines of "Select the elements from the -1 up to the next negative number (or the list exhausts)"? A successful result for -1 would be (-1, 9, 8, 7, 6, 5, 4). Using -2 would give the result (-2, 6, 15, 32). Not a homework problem. I'm just looking at an implementation using a bool, a for loop, and an if wondering if there's a cleaner way to do it.

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• Chrome SSL Security Issue under Windows systems?

  - by fraido

  The Fortify.net website allows you to check what SSL Encryption key is used by your browser. I gave it a try with the browsers I've on my machine and these are the results Fedora 9 Firefox 3.0.8 = AES cipher, 256-bit key Chrome 4.0.249.30 = AES cipher, 256-bit key Windows XP SP3 IE 6.0.2x = RC4 cipher, 128-bit key Firefox = AES cipher, 256-bit key Chrome 4.1.249.1042 (42199) = RC4 cipher, 128-bit key .... WHAT!!?!! Chrome is using RC4 128-bit (as IE6 does) that is well known as been very weak! Chrome under Unix works fine... I'm wondering how is this possible? Do you have this issue or is there a way to change the default key to be AES 256bit? I'm using Chrome as the main browser under Windows and I'm really considering to switch back to Firefox

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• Excel - referenced values via OleDB from .Net client

  - by ho

  I'm trying to read an Excel file (.xls, I think Excel 2003 compatible) via OleDB, but it fails to get the values for referenced fields. This is my current test code (please note, this is just part of the class): Private m_conn As OleDbConnection Public Sub New(ByVal fileName As String) Dim connString As String = String.Format("Provider=Microsoft.Jet.OLEDB.4.0;Data Source={0};Extended Properties=Excel 8.0;", fileName) m_conn = New OleDbConnection(connString) m_conn.Open() End Sub Public Sub GetSheet(ByVal sheet As String) Dim query As String = String.Format("SELECT * FROM [{0}]", sheet) Using cmd As OleDbCommand = m_conn.CreateCommand() cmd.CommandText = query Dim ds As New DataSet() Dim a As New OleDbDataAdapter(cmd) Using rdr As OleDbDataReader = cmd.ExecuteReader() While rdr.Read() Debug.WriteLine(rdr.Item(0).ToString()) End While End Using End Using End Sub But if the value is a reference (something like =+'MySheetName'!K37), I just get a DBNull from the call to rdr.Item(0). I can get around this by automating Excel instead, but would prefer not to have to use Excel automation so wondering if anyone knows how to do it.

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• PHP vs JSP Which is should I use/learn for my project?

  - by Jon

  I'm planning on making a fitness planning web application for my senior project at school. However, I don't know anything about either technology and my only experience with web development previously was with python and django. I was wondering what people might recommend to learn, what is most useful to learn for the job market, and what would be best for this project. If it matters, the programming languages I know are, C, C++, Java, and Python. My goal of the project is to learn technologies that will make me a more marketable person. Thanks

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• Does C# compile code inside an if(false) block?

  - by aximili

  I am just wondering if these code blocks gets compiled into .dll I don't think this one gets compiled at all #if SOMETHING_UNDEFINED // some code - this is ignored by the compiler #endif Now what about these? 1. if(false) { // some code - is this compiled? } 2. const bool F = false; if(F) { // some code - is this compiled? } 3. bool F = false; if(F) { // some code - is this compiled? }

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• How to get started with embedded systems in the aircraft or submarine industries?

  - by Jason

  Hi, Not 100% sure how to frame this question but here goes... I currently work as a Rails developer but want to work on more substancial / "meaty" projects and have always been very interested in embedded systems, especially systems that run on aircraft and especially submarines.....I know strange combination. I have been doing some searching & found lockheed martin produces a lot of underwater systems for various navys around the world e.g. http://www.naval-technology.com/projects/nssn/ However, there is very little information about what software is used within these systems, what OS's they use or anything else "technical", presume there is a lot of C / C++ involved but that is just a guess... so its hard to know where to even begin learning what is required to potential work in these areas. Just wondering if anyone has any experiance working with or more information about embeddeed systems in either the airline (onboard flight systems) or especially submarine systems? Thanks!

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• Accessing identical web services using the same client

  - by Krt_Malta

  Hi. I have some web services and I am creating a web client using ws-import. When creating the client I have this line: MyServiceService service = new MyServiceService(); It works fine as it is. I have the same web services running on another server and I was wondering if I could access them using the same client. Is it possible to change the wsdl url of the client? Ctrl-Space in Eclipse gives me 2 parameters which I can enter into MyServiceService which are URL arg0 and Qname arg1. Is this what I'm looking for? And if this is the case what should I put in Qname since I didn't find any Javadoc associated and didn't find it on google neither Thanks and regards, Krt_Malta

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• Compile-time trigonometry in C

  - by lhahne

  I currently have code that looks like while (very_long_loop) { ... y1 = getSomeValue(); ... x1 = y1*cos(PI/2); x2 = y2*cos(SOME_CONSTANT); ... outputValues(x1, x2, ...); } the obvious optimization would be to compute the cosines ahead-of-time. I could do this by filling an array with the values but I was wondering would it be possible to make the compiler compute these at compile-time?

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• environment configuration for tests running in NUnit

  - by Frank Schwieterman

  I have some integration tests that hit a webserver and verify certain functionalities. Depending on the build environment, the server will be at a different address (http://localhost:8080/, http://test-vm/, etc). I would like to run these tests from a TFS build. I'm wondering whats the appropriate way to configure these tests? Would I just add a setting to the config file? I'm doing that currently. Incidentally we do have a separate branch per test environment, so I could have a different config file checked in for each environment. I wonder if there is a better way though? I'd like the build project to be able to tell the test what server to test. This seems better because then I don't have to maintain config information on a per branch basis. I believe I'd be using NUnit for Team Build (http://nunit4teambuild.codeplex.com/) to get NUnit/TFS to play together.

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• design pattern tools to use?

  - by ajsie

  i have noticed that every area has some tools you can use to make things easier. eg. css = dreamweaver doctrine/propel = orm designer // you dont have to hardcore code schemas manually and remembering all the syntax/variables mysql = mysql workbench // the same etc. in this way you get aided and dont have to type things the hard way, and can learn the structure, but then use GUI tools to help you develop faster. now i'm learning design patterns (singleton, factory, command, memento etc) and im wondering if there are some kind of tools you can use that will help you develop faster. i dont know exactly what tools i'm trying to find, just helping me when coding with design patterns (schema drawings? references?) are there any?

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• Determining Excel spreadsheet format before Data Flow Task

  - by Josh Larsen

  I'm working on an SSIS package which uses a for each loop to iterate through excel files in a directory and a data flow task to import them. The issue I'm having is that the project manager I'm working with doesn't think the users will always follow the structure. So if a file is in the folder and the package tries to import it but the spreadsheet is missing columns or has extra columns it generates and error of course. Even though I have the task set to not fail the package; the package does indeed fail and then the other files aren't imported. So, I'm wondering what is the easiest way to either determine the spreadsheet is incorrectly formatted, or stop the error from failing the package execution? After taking said step I would just use a file copy task to move the file to a "Failure" folder. Then continue on processing the spreadsheets.

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• How does the email header field 'thread-index' work?

  - by Tim

  I was wondering if anyone knew how the thread-index field in email headers work? Here's a simple chain of emails thread indexes that I messaged myself with. Email 1 Thread-Index: AcqvbpKt7QRrdlwaRBKmERImIT9IDg== Email 2 Thread-Index: AcqvbpjOf+21hsPgR4qZeVu9O988Eg== Email 3 Thread-Index: Acqvbp3C811djHLbQ9eTGDmyBL925w== Email 4 Thread-Index: AcqvbqMuifoc5OztR7ei1BLNqFSVvw== Email 5 Thread-Index: AcqvbqfdWWuz4UwLS7arQJX7/XeUvg== I can't seem to say with certainty how I can link these emails together. Normally, I would use the in-reply-to field or references field, but I recently found that Blackberrys do NOT include these fields. The only include Thread-Index field.

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