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  • Memory management with Objective-C Distributed Objects: my temporary instances live forever!

    - by jkp
    I'm playing with Objective-C Distributed Objects and I'm having some problems understanding how memory management works under the system. The example given below illustrates my problem: Protocol.h #import <Foundation/Foundation.h> @protocol DOServer - (byref id)createTarget; @end Server.m #import <Foundation/Foundation.h> #import "Protocol.h" @interface DOTarget : NSObject @end @interface DOServer : NSObject < DOServer > @end @implementation DOTarget - (id)init { if ((self = [super init])) { NSLog(@"Target created"); } return self; } - (void)dealloc { NSLog(@"Target destroyed"); [super dealloc]; } @end @implementation DOServer - (byref id)createTarget { return [[[DOTarget alloc] init] autorelease]; } @end int main() { NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init]; DOServer *server = [[DOServer alloc] init]; NSConnection *connection = [[NSConnection new] autorelease]; [connection setRootObject:server]; if ([connection registerName:@"test-server"] == NO) { NSLog(@"Failed to vend server object"); } else [[NSRunLoop currentRunLoop] run]; [pool drain]; return 0; } Client.m #import <Foundation/Foundation.h> #import "Protocol.h" int main() { unsigned i = 0; for (; i < 3; i ++) { NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init]; id server = [NSConnection rootProxyForConnectionWithRegisteredName:@"test-server" host:nil]; [server setProtocolForProxy:@protocol(DOServer)]; NSLog(@"Created target: %@", [server createTarget]); [[NSRunLoop currentRunLoop] runUntilDate:[NSDate dateWithTimeIntervalSinceNow:1.0]]; [pool drain]; } return 0; } The issue is that any remote objects created by the root proxy are not released when their proxy counterparts in the client go out of scope. According to the documentation: When an object’s remote proxy is deallocated, a message is sent back to the receiver to notify it that the local object is no longer shared over the connection. I would therefore expect that as each DOTarget goes out of scope (each time around the loop) it's remote counterpart would be dellocated, since there is no other reference to it being held on the remote side of the connection. In reality this does not happen: the temporary objects are only deallocate when the client application quits, or more accurately, when the connection is invalidated. I can force the temporary objects on the remote side to be deallocated by explicitly invalidating the NSConnection object I'm using each time around the loop and creating a new one but somehow this just feels wrong. Is this the correct behaviour from DO? Should all temporary objects live as long as the connection that created them? Are connections therefore to be treated as temporary objects which should be opened and closed with each series of requests against the server? Any insights would be appreciated.

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  • WPF List - ListItem Visibility

    - by niao
    Greetings, I have a FlowDocument where List control is placed. Inside this list I have some ListItem. Is there any way to set some kind of Visibility for specific ListItem? I don't see a coressponding Property like Visibility for ListItem. When I set fontsize="0.1" then application hangs (it goes into infinite loop).

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  • jQuery bind efficiency

    - by chelfers
    I'm having issue with load speed using multiple jQuery binds on a couple thousands elements and inputs, is there a more efficient way of doing this? The site has the ability to switch between product lists via ajax calls, the page cannot refresh. Some lists have 10 items, some 100, some over 2000. The issue of speed arises when I start flipping between the lists; each time the 2000+ item list is loaded the system drags for about 10 seconds. Before I rebuild the list I am setting the target element's html to '', and unbinding the two bindings below. I'm sure it has something to do with all the parent, next, and child calls I am doing in the callbacks. Any help is much appreciated. loop 2500 times <ul> <li><input type="text" class="product-code" /></li> <li>PROD-CODE</li> ... <li>PRICE</li> </ul> end loop $('li.product-code').bind( 'click', function(event){ selector = '#p-'+ $(this).prev('li').children('input').attr('lm'); $(selector).val( ( $(selector).val() == '' ? 1 : ( parseFloat( $(selector).val() ) + 1 ) ) ); Remote.Cart.lastProduct = selector; Remote.Cart.Products.Push( Remote.Cart.customerKey, { code : $(this).prev('li').children('input').attr('code'), title : $(this).next('li').html(), quantity : $('#p-'+ $(this).prev('li').children('input').attr('lm') ).val(), price : $(this).prev('li').children('input').attr('price'), weight : $(this).prev('li').children('input').attr('weight'), taxable : $(this).prev('li').children('input').attr('taxable'), productId : $(this).prev('li').children('input').attr('productId'), links : $(this).prev('li').children('input').attr('productLinks') }, '#p-'+ $(this).prev('li').children('input').attr('lm'), false, ( parseFloat($(selector).val()) - 1 ) ); return false; }); $('input.product-qty').bind( 'keyup', function(){ Remote.Cart.lastProduct = '#p-'+ $(this).attr('lm'); Remote.Cart.Products.Push( Remote.Cart.customerKey, { code : $(this).attr('code') , title : $(this).parent().next('li').next('li').html(), quantity : $(this).val(), price : $(this).attr('price'), weight : $(this).attr('weight'), taxable : $(this).attr('taxable'), productId : $(this).attr('productId'), links : $(this).attr('productLinks') }, '#p-'+ $(this).attr('lm'), false, previousValue ); });

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  • LINQ-TO-XML not returning all value

    - by mmcglynn
    I am trying to get all values in the select. using item.Count shows the correct number of values, but only one .Value is returned from the loop. Why? Dim fooXML As XDocument = XDocument.Load(Server.MapPath("xml/foo.xml")) Dim query = _ From c In fooXML...<foobaryear> _ Select c...<event> For Each item In query Response.Write(item.Value) Next

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  • an x86 question

    - by wide
    i'm working for my exam. i didn't resolved this question. does anyone help me? assume that there are two block, BLOCK1 AND BLOCK2. every block has 50 bytes. write a program to add BLOCK1 with BLOCK2 , and store result to BLOCK2 using LODS, STOS and LOOP etc. assembly commands?

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  • inserting number into oracle sql - using jython

    - by kdev
    I have this insert command where iam trying to insert a number to be taken from loop i=0 for line in column: myStmt.executeQuery("INSERT INTO REVERSE_COL ( TABLE_NAME,COL_NAME,POS) values (,'test','"+column[i]+"','"+i+"'") i=i+1 POS IS NUMBER DATATYPE but it works if i hard code as 1 i=0 for line in column: myStmt.executeQuery("INSERT INTO REVERSE_COL ( TABLE_NAME,COL_NAME,POS) values (,'test','"+column[i]+"',1") I have tried only i , +i+ and other method but its not working any suggestion how to solve this . Thanks everyone .

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  • Is there a decent vector / spline library for php?

    - by Brendan Heywood
    Does anyone know of the best way to render clean vectors into a php image and then serve it as a jpeg/png? Specifically I want to draw lines, polygons and splines which are anti-aliased and then serve them up as jpegs. Preferably also with an alpha option when rendering. What would be spectacular is a php library with a similar API to Raphael (without the animation) - not only because Raphael has a great API but also because I'm already using it on my website for the dynamic bits but also need to bake jpeg's in parallel for static consumption.

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  • iframe for ad loading good or bad?

    - by Cedar Jensen
    According to Yahoo's "Best Practices for Speeding Up your Site", the pros for using iframes: Helps with slow third-party content like badges and ads Download scripts in parallel but the cons are: Costly even if blank Blocks page onload I want to use an iframe to load ads using the technique mentioned on this site: http://meanderingpassage.com/2007/08/15/keeping-javascript-widgets-from-controlling-your-blog/ Does using this technique mean that as soon as the html contents requested by the iframe are returned to the client, it will load the ad script, potentially blocking the rest of the page's rendering and downloading? Or will the iframe request get processed concurrently while rest of the document is downloaded and rendered?

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  • Disable table in javascript

    - by Muhammad Akhtar
    Hi, I have many controls in table and I want to disable all the controls using JavaScript upon clicking of some checkbox. I have google and found that we can't disable table instead all controls through loop. Please suggest me, what is better idea Thanks

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  • Avoid copying of data between user and kernel space and vice-versa

    - by bala1486
    Hello, I am developing a active messaging protocol for parallel computation that replaces TCP/IP. My goal is to decrease the latency of a packet. Since the environment is a LAN, i can replace TCP/IP with simpler protocol to reduce the packet latency. I am not writing any device driver and i am just trying to replace the TCP/IP stack with something simpler. Now I wanted to avoid copying of a packet's data from user space to kernel space and vice-versa. I heard of the mmap(). Is it the best way to do this? If yes, it will be nice if you can give links to some examples. I am a linux newbie and i really appreciate your help.. Thank you... Thanks, Bala

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  • Strategy for developing namespaced and non-namespaced versions of same PHP code

    - by porneL
    I'm maintaining library written for PHP 5.2 and I'd like to create PHP 5.3-namespaced version of it. However, I'd also keep non-namespaced version up to date until PHP 5.3 becomes so old, that even Debian stable ships it ;) I've got rather clean code, about 80 classes following Project_Directory_Filename naming scheme (I'd change them to \Project\Directory\Filename of course) and only few functions and constants (also prefixed with project name). Question is: what's the best way to develop namespaced and non-namespaced versions in parallel? Should I just create fork in repository and keep merging changes between branches? Are there cases where backslash-sprinkled code becomes hard to merge? Should I write script that converts 5.2 version to 5.3 or vice-versa? Should I use PHP tokenizer? sed? C preprocessor? Is there a better way to use namespaces where available and keep backwards compatibility with older PHP?

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  • Restart Delphi Application Programmatically

    - by Smasher
    It should not be possible to run multiple instances of my application. Therefore the project source contains: CreateMutex (nil, False, PChar (ID)); if (GetLastError = ERROR_ALREADY_EXISTS) then Halt; Now I want to restart my application programmatically. The usual way would be: AppName := PChar(Application.ExeName) ; ShellExecute(Handle,'open', AppName, nil, nil, SW_SHOWNORMAL) ; Application.Terminate; But this won't work in my case because of the mutex. Even if I release the mutex before starting the second instace it won't work because shutdown takes some time and two instance cannot run in parallel (because of common resources and other effects). Is there a way to restart an application with such characteristics? (If possible without an additional executable) Thanks in advance.

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  • .Net Entity Framework SaveChanges is adding without add method

    - by tmfkmoney
    I'm new to the entity framework and I'm really confused about how savechanges works. There's probably a lot of code in my example which could be improved, but here's the problem I'm having. The user enters a bunch of picks. I make sure the user hasn't already entered those picks. Then I add the picks to the database. var db = new myModel() var predictionArray = ticker.Substring(1).Split(','); // Get rid of the initial comma. var user = Membership.GetUser(); var userId = Convert.ToInt32(user.ProviderUserKey); // Get the member with all his predictions for today. var memberQuery = (from member in db.Members where member.user_id == userId select new { member, predictions = from p in member.Predictions where p.start_date == null select p }).First(); // Load all the company ids. foreach (var prediction in memberQuery.predictions) { prediction.CompanyReference.Load(); } var picks = from prediction in predictionArray let data = prediction.Split(':') let companyTicker = data[0] where !(from i in memberQuery.predictions select i.Company.ticker).Contains(companyTicker) select new Prediction { Member = memberQuery.member, Company = db.Companies.Where(c => c.ticker == companyTicker).First(), is_up = data[1] == "up", // This turns up and down into true and false. }; // Save the records to the database. // HERE'S THE PART I DON'T UNDERSTAND. // This saves the records, even though I don't have db.AddToPredictions(pick) foreach (var pick in picks) { db.SaveChanges(); } // This does not save records when the db.SaveChanges outside of a loop of picks. db.SaveChanges(); foreach (var pick in picks) { } // This saves records, but it will insert all the picks exactly once no matter how many picks you have. //The fact you're skipping a pick makes no difference in what gets inserted. var counter = 1; foreach (var pick in picks) { if (counter == 2) { db.SaveChanges(); } counter++; } There's obviously something going on with the context I don't understand. I'm guessing I've somehow loaded my new picks as pending changes, but even if that's true I don't understand I have to loop over them to save changes. Can someone explain this to me?

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  • php mysql database users connection handling

    - by aviv
    What is the best way to handle mysql database users connection in PHP? I have a web server running a PHP application on MySQL. I have created a database user for the application: dbuser1 with limited access - only for query, insert and update tables. No alter table. Now the question is, should i use the same dbuser1 widely in my scripts, so if there are 100 current people using my system and hence 100 scripts running parallel they all connect to the database with the same dbuser1? or should i create a few users and assign each script a different user or load-balance between the dbusers ?

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  • Limit on FileReference uploads?!

    - by Rudy
    Hello, I am currently uploading files in ActionScript 3 using the upload() method of the FileReference class. I built an uploader than can do simultaneous or parallel uploads, having a variable set the number of maximum uploads at a time. I noticed that for Internet Explorer I could be uploading 10 or more files simultaneously, but FireFox and Safari seems to cap the number of uploads to 2. That is, when I call the upload method on per say, 3 files, only 2 will get events back (such as ProgressEvent.PROGRESS). Only when one of the 2 uploads finishes, then the 3rd one will start. This behavior does not happen for Internet Explorer. I have tried with a large number of files, and some big files, to make sure this behavior was consistent. I was wondering if anyone noticed this behavior please, and if so, what is the reason for this behavior please? I appreciate your help, Thank you very much, Rudy

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  • Jquery $().each method obscures 'this' keyword

    - by Jeff Fritz
    I am creating a Javascript object that contains a function that executes a jQuery each method like the following: function MyClass { Method1 = function(obj) { // Does something here } Method2 = function() { $(".SomeClass").each(function() { // 1 2 this.Method1(this); }); } } Which object is each THIS referring to? jQuery is referring to the item returned from the each iteration. However, I would like This[1] to refer to the containing class... How can I refer to the containing class from within the jQuery loop?

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  • How to tar multiple files in perl

    - by kpraveenreddy
    How can I tar multiple directories and also append files with some pattern like '.txt' and exclude some directories and exclude some patterns like '.exe' all into a single tar file. The main point is the number of directories are unknown(dynamic), so I need to loop through..I guess?

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  • SQL Server: How to iterate over function arguments

    - by atricapilla
    I'm trying to learn SQL and for demonstration purposes I would like to create a loop which iterates over function arguments. E.g. I would like to iterate over SERVERPROPERTY function arguments (propertynames). I can do single select like this: SELECT SERVERPROPERTY('ProductVersion') AS ProductVersion, SERVERPROPERTY('ProductLevel') AS ProductLevel, SERVERPROPERTY('Edition') AS Edition, SERVERPROPERTY('EngineEdition') AS EngineEdition; GO but how to iterate over all these propertynames? Thanks in advance.

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  • MonoTouch - foreach vs for loops (performance)

    - by ifwdev
    Normally I'm well aware that a consideration like this is premature optimization. Right now I have some event handlers being attached inside a foreach loop. I am wondering if this style might be prone to leaks or inefficient memory use due to closures being created. Is there any validity to this thinking?

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