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• Ajax/PHP - should I use one long running script or polling?

  - by Brian

  Hello, I have a PHP script that is kicked off via ajax. This PHP script uses exec() to run a separate PHP script via the shell. The script that is called via exec() may take 30 seconds or so to complete. I need to update the UI once it is finished. Which of these options is preferred? a) Leave the HTTP connection open for the 30 seconds and wait for it to finish. b) Have exec() run the PHP script in the background and then use ajax polling to check for completion (every 5 seconds or so). c) Something else that I haven't thought of. Thank you, Brian

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• How does compilation work with AOP?

  - by alee

  I need quick answer to a simple thing in AOP. If i have a code deployed at client side and i have written new aspects, which i want in the client side software. do i have to "recompile" complete software with "original" code and new "AOP" code? (with aop compiler)? i.e. do i need the source code of original program with source code of new AOP and compile 'em boht? P.S: I am asking in general, not being specific to any language.

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• Long running, polling, queueing process for Python. What's the best stuff to use?

  - by Bialecki

  Feel free to close and/or redirect if this has been asked, but here's my situation: I've got an application that will require doing a bunch of small units of work (polling a web service until something is done, then parsing about 1MB worth of XML and putting it in a database). I want to have a simple async queueing mechanism that'll poll for work to do in a queue, execute the units of work that need to be done, and have the flexibility to allow for spawning multiple worker processes so these units of work can be done in parallel. (Bonus if there's some kind of event framework that would also me to listen for when work is complete.) I'm sure there is stuff to do this. Am I describing Twisted? I poked through the documentation, I'm just not sure exactly how my problems maps onto their framework, but I haven't spent much time with it. Should I just look at the multiprocess libraries in Python? Something else?

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• Detach subdirectory into separate Git repository

  - by matli

  I have a Git repository which contains a number of subdirectories. Now I have found that one of the subdirectories is unrelated to the other and should be detached to a separate repository. How can I do this while keeping the history of the files within the subdirectory? I guess I could make a clone and remove the unwanted parts of each clone, but I suppose this would give me the complete tree when checking out an older revision etc. This might be acceptable, but I would prefer to be able to pretend that the two repositories doesn't have a shared history. Just to make it clear, I have the following structure: XYZ/ .git/ XY1/ ABC/ XY2/ But I would like this instead: XYZ/ .git/ XY1/ XY2/ ABC/ .git/

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• Display Ajax Loader while page rendering

  - by Dean

  This is probably a simple question but how can I best use an AJAX loader in ASP.NET to provide a loading dialog whilst the page is being built? I currently have an UpdatePanel with an associated UpdateProgressPanel which contains the loading message and gif in a ProgressTemplate. Currently I have a page that onLoad() goes and gets the business entities and then displays them. While it is doing this I would like to display an AJAX loader. Would it be better to have nothing in the page load and have a hidden button that is triggered onLoadComplete or unLoad() which would then wait for the button click method to complete displaying the UpdateProgressPanel?

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• Type patterns in Haskell

  - by finnsson

  I'm trying to compile a simple example of generic classes / type patterns (see http://www.haskell.org/ghc/docs/latest/html/users_guide/generic-classes.html) in Haskell but it won't compile. Any ideas about what's wrong with the code would be helpful. According to the documentation there should be a module Generics with the data types Unit, :*:, and :+: but ghc (6.12.1) complaints about Not in scope: data constructor 'Unit' etc. It seems like there's a package instant-generics with the data types :*:, :+: and U but when I import that module (instead of Generics) I get the error Illegal type pattern in the generic bindings {myPrint _ = ""} The complete source code is import Generics.Instant class MyPrint a where myPrint :: a -> String myPrint {| U |} _ = "" myPrint {| a :*: b |} (x :*: y) = "" (show x) ++ ":*:" ++ (show y) myPrint {| a :+: b |} _ = "" data Foo = Foo String instance MyPrint a => MyPrint a main = myPrint $ Foo "hi" and I compile it using ghc --make Foo.hs -fglasgow-exts -XGenerics -XUndecidableInstances P.S. The module Generics export no data types, only the functions: canDoGenerics mkGenericRhs mkTyConGenericBinds validGenericInstanceType validGenericMethodType

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• Running a python script in background from a CGI

  - by Cagey

  I have a python CGI which runs some script in the background and shows the stdout in the html page. I run the script when the user clicks some button in the page. My problem is when the script starts running the page becomes busy and the user can't use the other client side features in the page. What I want is: The script should run in background when the user clicks the button and should notify the CGI when run is complete. Then the CGI show should the stdout of the script run. How can this be done?

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• Best way to export an icon from photoshop?

  - by Mudtail

  Hi, I'm writing a program to notify me of new email. It's mostly complete, I'm just working on the notifyicon code now. It's supposed to display the usual application icon with a box containing the count of unread emails inside it. I created icons for this in photoshop, exported them as 16x16 transparent PNGs, then converted them into windows ico files using ConvertIcon.com. Given that the image was 16x16 and the WinXP system tray uses 16x16 icons, I would assume the images would work. HOWEVER, when I start the application and get an email, the icon's all blurry: http://cyndle.com/bPJ7

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• Single Query returning me 4 tables, How to get all of them back into dataset ?

  - by Shantanu Gupta

  How to fill multiple tables in a dataset. I m using a query that returns me four tables. At the frontend I am trying to fill all the four resultant table into dataset. Here is my Query. Query is not complete. But it is just a refrence for my Ques Select * from tblxyz compute sum(col1) suppose this query returns more than one table, I want to fill all the tables into my dataset I am filling result like this con.open(); adp.fill(dset); con.close(); Now when i checks this dataset. It shows me that it has four tables but only first table data is being displayed into it. rest 3 dont even have schema also. What i need to do to get desired output

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• Invoicing vs Quoting or Estimating

  - by FreshCode

  If invoices can be voided, should they be used as quotations? I have an Invoices tables that is created from inventory associated with a Job or Order. I could have a Quotes table as a halfway-house between inventory and invoices, but it feels like I would have duplicate data structures and logic just to handle an "Is this a quote?" bit. From a business perspective, quotes are different from invoices: a quote is sent prior to an undertaking and an invoice is sent once it is complete and payment is due, but how to represent this in my repository and model. What is an elegant way to store and manage quotes & invoices in a database? Edit: indicated Job === Order for this particular instance.

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• What is the possible benefit (if any) of allowing recursive contructors?

  - by Penang

  In Java, constructors cannot be recursive. Compile time error: "recursive constructor invocation". Let's assume that we did not have this restriction. Things to keep in mind: The return type of a constructor is void. Since it is a void method you can't harness the complete power of recursion. A constructor can invoke itself (or any other constructor) using this(). But a "call to this must be first statement in constructor" We could use non local data between consecutive calls to still have some possible gain from recursive constructors. Would there be any benefit from allowing recursive constructors?

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• What is the maximum number of controls that a VBA form can hold?

  - by Lunatik

  I'm currently building an Excel 2003 app that requires a horribly complex form and am worried about limitations on the number of controls. It currently has 154 controls (counted using Me.Controls.Count - this should be accurate, right?) but is probably only about a third complete. The workflow really fits a single form, but I guess I can split it up if I really have to. I see evidence in a Google search that VB6 (this usually includes VBA) has a hard limit of 254 controls in a form. However, I created a dummy form with well over 1200 controls which still loaded and appeared to work just fine. I did get some 'out of memory' errors when trying to add specific combinations of controls though, say 800 buttons and 150 labels, leading me to think that any limit might be affected by the memory requirements of each type of control. Does anyone have any information that might help ensure that I or, more importantly, other users with differing environments don't run into any memory issues with such a large form?

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• Getters and Setters: Code smell, Necessary Evil, or Can't Live Without Them [closed]

  - by Avery Payne

  Possible Duplicate: Allen Holub wrote “You should never use get/set functions”, is he correct? Is there a good, no, a very good reason, to go through all the trouble of using getters and setters for object-oriented languages? What's wrong with just using a direct reference to a property or method? Is there some kind of "semantical coverup" that people don't want to talk about in polite company? Was I just too tired and fell asleep when someone walked out and said "Thou Shalt Write Copious Amounts of Code to Obtain Getters and Setters"? Follow-up after a year: It seems to be a common occurrence with Java, less so with Python. I'm beginning to wonder if this is more of a cultural phenomena (related to the limitations of the language) rather than "sage advice". The -1 question score is complete for-the-lulz as far as I am concerned. It's interesting that there are specific questions that are downvoted, not because they are "bad questions", but rather, because they hit someone's raw nerve.

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• ActionScript BitmapData Built-in To Bitmaps?

  - by TheDarkIn1978

  i've used a Loader and URLRequest to download a .png from the internet and add it to my display list. since it's already a bitmap, does it have built in bitmap data already? or do i have to create the bitmap data myself? also, why does the same trace statement return false in the mouseMoveHandler when it outputs true in the displayImage function? var imageLoader:Loader = new Loader(); imageLoader.load(new URLRequest("http://somewebsite.com/image.png")); imageLoader.contentLoaderInfo.addEventListener(Event.COMPLETE, displayImage); function displayImage(evt:Event):void { addChild(evt.target.content); addEventListener(MouseEvent.MOUSE_MOVE, mouseMoveHandler); trace(evt.target.content is Bitmap); //outputs 'true' } function mouseMoveHandler(evt:MouseEvent):void { trace(evt.target.content is Bitmap); //outputs 'false' }

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• Visual Studio 2008 resolving wrong reference

  - by e28Makaveli

  In my project file, I have the following entry: <Reference Include="Microsoft.Practices.Unity, Version=1.2.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL"> <HintPath>..\..\..\..\Libraries\Microsoft.Practices.Unity.dll</HintPath> </Reference> which in absolute terms translates to: C:\dev\LUT600 2.1.1\OCC600\Libraries Somehow, when I try to compile the project, Visual Studio loads a reference from a totally different path: /reference:"C:\Program Files\Microsoft Enterprise Library 4.1 - October 2008\Bin\Microsoft.Practices.Unity.dll. How it resolves to this location is a complete mystery as this DLL is not referenced anywhere in this project. I have set Specific Verion to true but it still resolves the reference from this location. Any ideas? TIA. Klaus

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• How to build Object Oriented Skills?

  - by cedar715

  Being a core developer for couple of years, coding applications seeing the class diagrams, sequence diagrams, I decided to improve my self, taking the next step of designing. As I'm an OO developer, I'm interested in improving my design skills. For Example, I had a hard time designing a currency converter. My questions to the SO: Is it by experience the design skills can be acquired? Will learning books/blog/material over internet etc help? Is it that one needs the domain knowledge of the application being developed? Knowing Design patterns, principles? Studying 'Code Complete' book ? Need to have Problem-solving skills? In short, given a problem, I just want to solve it in Object-oriented way??

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• Calculating terrain height in 3d-space

  - by Jonas B

  Hi I'm diving into 3d programming a bit and am currently learning by writing a procedural terrain generator that generates terrain based on a heightmap. I would also want to implement some physics and my first attempt at terrain collision was by simply checking the current position vs the heightmap. This however wont work well against small objects as you'd have to calculate the height by taking the heightdifference of the nearest vertices of the object and doing this every colision check is pretty slow. Beleive me I tried googling for it but there's simply so much crap and millions of blogs posting ripped-of newbie tutorials everywhere with basically no real information on the subject, I can't find anything that explains it or even names any generally used techniques. I'm not asking for code or a complete solution, but if anyone knows a particular technique good for calculating a high-res heightmap out of the already generated and smoothed terrain I would be very happy as I could look into it further when I know what I'm looking for. Thanks

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• Query through linked server is very slow

  - by Sergey Olontsev

  I have 2 SQL 2005 servers SRV1 and SRV2. SRV2 is the linked server on SRV1. I run a storep proc with params on SRV2 and it is completed immediately. But when I run the same proc through the linked server on SRV1, for example EXEC [SRV1].DB_TEST.dbo.p_sample_proc it takes about 8-10 minutes to complete. After restarting SRV2 the problem is gone. But some time later it returns. Does anyone have any ideas what it could be?

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• Error: Cannot parse function definition from ' hello()' in Mytest.xs, line 9

  - by Nikole

  Hi I am trying to use perl XS in RHEL 5. but simple programm is giving error.I followed same code as in Example 1 in perldoc perlxstut Can anyone help me in correcting the following error? [root@localhost Mytest]# [root@localhost Mytest]# pwd /home/nikole/perlcode/Mytest [root@localhost Mytest]# ls blib lib MANIFEST Mytest.xs pm_to_blib README Changes Makefile.PL Mytest.c Mytest.xsc ppport.h t [root@localhost Mytest]# perl Makefile.PL Checking if your kit is complete... Looks good Writing Makefile for Mytest [root@localhost Mytest]# [root@localhost Mytest]# [root@localhost Mytest]# make /usr/bin/perl /usr/lib/perl5/5.8.8/ExtUtils/xsubpp -typemap /usr/lib/perl5/5.8.8/ExtUtils/typemap Mytest.xs Mytest.xsc && mv Mytest.xsc Mytest.c Error: Cannot parse function definition from ' hello()' in Mytest.xs, line 9 Please specify prototyping behavior for Mytest.xs (see perlxs manual) make: *** [Mytest.c] Error 1 [root@localhost Mytest]# Thanks

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• Code snippets in interview

  - by Maddy

  Hi All, Recently I went to an interview for a C development position. Instead of asking me questions, they just gave me 20 code snippets to find out two logical errors on each one. I just couldn't complete all of the 20 since it took me time to go through each of these code snippets. My question is: Is this the right way to judge a candidate? If yes, how can I improve over my error detection skills so that I don't need to waste a lot of time in the next interview? If possible, please, suggest me some links where I could find lots of samples of such questions (mainly in C). Thanks and regards, Maddy

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• ADC code in with atmega32

  - by Komal

  uint read_adc(uchar adc_input) { ADMUX=adc_input | (0x00 & 0xff); delay_us(10); ADCSRA|=0x40; //START THE CONVERSION while ((ADCSRA & 0x10)==0); // wait for the conversion to complete ADCSRA|=0x10; //clear the ADC flag return ADCW; } Q: Whats the meaning of "ADMUX=adc_input | (0x00 & 0xff)" ? which input channel we have selected here ?

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• iPhone: Error and error handling confusion in comparison.

  - by Mr. McPepperNuts

  NSArray *results = [managedObjectContext executeFetchRequest:request error:&error]; if(results == nil){ NSLog(@"No results found"); searchObj = nil; }else{ if ([[[results objectAtIndex:0] name] caseInsensitiveCompare:passdTextToSearchFor] == 0) { NSLog(@"results %@", [[results objectAtIndex:0] name]); searchObj = [results objectAtIndex:0]; }else { NSLog(@"No results found"); searchObj = nil; } } The code above compares data a user enters to data pulled from a database. If I enter data which is in the database; it works. But if I enter complete gibberish it returns the error below instead of "No results found." *** WebKit discarded an uncaught exception in the webView:shouldInsertText:replacingDOMRange:givenAction: delegate: <NSRangeException> *** -[NSCFArray objectAtIndex:]: index (0) beyond bounds (0) The results array being null should be accounted for during the checks in the above code, no?

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• How can I detect 'any' ajax request being completed using jQuery?

  - by Brian Scott

  I have a page where I can insert some javascript / jquery to manipulate the output. I don't have any other control over the page markup etc. I need to add an extra element via jquery after each present on the page. The issue is that the elements are generated via an asynchronous call on the existing page which occurs after $(document).ready is complete. Essentially, I need a way of calling my jquery after the page has loaded and the subsequent ajax calls have completed. Is there a way to detect the completion of any ajax call on the page and then call my own custom function to insert the additional elements after the newly created s ?

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• Quick example of multi-column results with jQueryUI's new Autocomplete?

  - by Lance May

  I just found out that the jQueryUI now has it's own built-in auto-complete combo box. Great news! Unfortunately, the next thing I found is that making it multi-column doesn't seem nearly that simple (at least via documentation). There is a post here where someone mentions that they've done it (and even gives code), but I'm having trouble understanding what some of their code is doing. I'm just curious if anyone has ran across this before and could post a quick and easy sample of making a multi-column result set. Thanks much in advance.

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• Classic ASP and MVC side-by-side, different projects?

  - by David Lively

  I've tried asking this in a few different ways, but let's give it another shot (as I've yet to receive an answer and this is driving me nuts!) I have a very large classic ASP 3.0 application (~350K lines) that I want to start migrating to ASP.NET MVC. I'd like to keep the old ASP files in a separate project from the MVC stuff. Ideas on how to debug these? Should I just dump the files in the same folder and create two different projects ( a WAP and an MVC app) that reference the relevant files and folders required by each? This should work, but does anyone have a better idea? I need the ability to migrate small parts of the application individually as this will probably take a year or two to complete.

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