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• DrawRect on the iPhone vs. the Mac

  - by Joe Cannatti

  I am an experienced iPhone dev beginning to work on my first Mac app. One thing that is really throwing me off is the differences between UIView and NSView. It seems that I cannot set the background color of a NSView via interface builder as I can with a UIView. It also seems that I cannot do it by simply sending a setBackgroundColor: message to it. All the examples I have seen are overriding drawRect: in a subclass of NSView. Is that really the only way to do it? What is the conceptual difference here, and why is it this way? NOTE: I am only trying to set the background color to the default grey.

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• Would using a MemoryMappedFile for IPC across AppDomains be faster than WCF/named pipes?

  - by Morten Mertner

  Context: I am loading and executing untrusted code in a separate AppDomain and am currently communicating between the two using WCF (using named pipes as the underlying transport). I am exchanging relatively simple object graphs using a reasonably coarse-grained API, but would like to use a more fine-grained API if it does not cost me performance-wise. I've noticed that 4.0 adds a MemoryMappedFile class (which doesn't need a physical file, so could be entirely memory based). What kind of performance gains could I expect to see (if any) by using this new class? I know that it would take some "infrastructure code" to get the request/response behavior of WCF, but for now I'm only interested in the performance difference.

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• javascript object access performance

  - by youdontmeanmuch

  In Javascript, when your getting a property of an object, is there a performance penalty to getting the whole object vs only getting a property of that object? Also Keep in mind I'm not talking about DOM access these are pure simple Javascript objects. For example: Is there some kind of performance difference between the following code: Assumed to be faster but not sure: var length = some.object[key].length; if(length === condition){ // Do something that doesnt need anything inside of some.object[key] } else{ var object = some.object[key]; // Do something that requires stuff inside of some.object[key] } I think this would be slower but not sure if it matters. var object = some.object[key]; if(object.length === condition){ // Do something that doesnt need anything inside of some.object[key] } else{ // Do something that requires stuff inside of some.object[key] }

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• Creating Delegates With Lambda Expressions in F#

  - by Matt H

  Why does... type IntDelegate = delegate of int -> unit type ListHelper = static member ApplyDelegate (l : int list) (d : IntDelegate) = l |> List.iter (fun x -> d.Invoke x) ListHelper.ApplyDelegate [1..10] (fun x -> printfn "%d" x) not compile, when: type IntDelegate = delegate of int -> unit type ListHelper = static member ApplyDelegate (l : int list, d : IntDelegate) = l |> List.iter (fun x -> d.Invoke x) ListHelper.ApplyDelegate ([1..10], (fun x -> printfn "%d" x)) does? The only difference that is that in the second one, ApplyDelegate takes its parameters as a tuple. Error 1 This function takes too many arguments, or is used in a context where a function is not expected

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• Indexing affects only the WHERE clause?

  - by andre matos

  If I have something like: CREATE INDEX idx_myTable_field_x ON myTable USING btree (field_x); SELECT COUNT(field_x), field_x FROM myTable GROUP BY field_x ORDER BY field_x; Imagine myTable with around 500,000 rows and most of field_x values being unique. Since I don't use any WHERE clause, will the created index have any effect at all in my query? Edit: I'm asking this question because I don't get any relevant difference between query-times before and after creating the index; They always take about 8 seconds (which, of course is too much time!). Is this behaviour expected?

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• URIs vs Hidden Forms

  - by NateDogg

  I'm working in the Codeigniter framework, and want to send requests to my controller/model that have several variables involved. Is there a difference between passing those variables via a hidden form (i.e. using "post") as opposed to passing them through URIs (e.g. 'travel/$month/$day/')? What about security concerns? e.g. URIs: http://www.example.com/travel/$month/$day/ Hidden Form: form_hidden('month',$month); form_hidden('day',$day);

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• Does anyone know of a good free bulk upload tool for web apps?

  - by Ev

  I have a web application in which a user has to upload images to a gallery. At the moment they need to upload one image at a time so it's pretty tedious. I'd like to implement a system where they could potentially drag and drop files into the browser, or select a folder to upload. Any ideas? Thanks in advance! (By the way; it's a .Net App if it makes a difference, but I was thinking most of the work would be happening client side so shouldn't matter) -Ev

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• Why is new showat attribute required when using code generation?

  - by Patrick Karcher

  When I generate code using T4 templates in Visual Studio 2010, I get the following error for each of my asp controls when I try to compile: Control "ddState" is missing required attribute "showat". I have never gotten this error in previous versions of .NET. Further, I don't get this error when I manually construct my pages either by dragging/dropping, nor do I get it when I type out the control text myself. When I generate code, I have to manually add showat="client" to my tag for the compiler to be happy. It was my understanding that I never had to explicitly specify this tag. The following: <asp:dropdownlist id="ddState" runat="server" showat="client" /> solves the problem. Why do I have to add this to generated code but not other times? (It's a VS-2010 webforms project, using VB, in case that makes a difference.)

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• Python text file processing speed issues

  - by Anonymouslemming

  Hi all, I'm having a problem with processing a largeish file in Python. All I'm doing is f = gzip.open(pathToLog, 'r') for line in f: counter = counter + 1 if (counter % 1000000 == 0): print counter f.close This takes around 10m25s just to open the file, read the lines and increment this counter. In perl, dealing with the same file and doing quite a bit more (some regular expression stuff), the whole process takes around 1m17s. Perl Code: open(LOG, "/bin/zcat $logfile |") or die "Cannot read $logfile: $!\n"; while (<LOG>) { if (m/.*\[svc-\w+\].*login result: Successful\.$/) { $_ =~ s/some regex here/$1,$2,$3,$4/; push @an_array, $_ } } close LOG; Can anyone advise what I can do to make the Python solution run at a similar speed to the Perl solution? I've tried just uncompressing the file and dealing with it using open instead of gzip.open, but that made a very small difference to the overall time.

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• Access 2007: Dynamic SQL to be run when opening a report

  - by blockcipher

  I'm trying to have some SQL execute when I open a report. This works fine when I try to match on a column that's an integer with an integer, but when I try to match on a "text" column, it keeps popping up a dialog asking for what you want to filter on. Here's a somple query: select person_phone_numbers.person_id from person_phone_numbers where phone_number = '444-444-4444' This is actually a sub-query I'm trying to use, but this is where the problem is. If I change it to this it works fine: select person_phone_numbers.person_id from person_phone_numbers where phone_id = 2 I put this in the OnOpen event and I'm assigning it to Me.RecordSource if that makes a difference. My goal here is to have a form accept query parameter(s) and have it open a report with the results. Any thoughts on why it wants to ask for a parameter vs. just running the query the way I have it?

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• How to search for closest value in a lookup table?

  - by CSharperWithJava

  I have a simple one dimmensional array of integer values that represent a physical set of part values I have to work with. I then calculate and ideal value mathematically. How could I write an efficient search algorithm that will find the smallest abosulte difference from my ideal value in the array? The array is predetermined and constant, so it can be sorted however I need. Example Lookup array: 100, 152, 256, 282, 300 Searching for an ideal value of 125 would find 100 in the array, whereas 127 would find 152. The actual lookup array will be about 250 items long and never change.

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• Annotations: methods vs variables

  - by Zenzen

  I was always sure (don't know why) that it's better to add annotations to variables, but while browsing the Hibernate doc http://docs.jboss.org/hibernate/stable/annotations/reference/en/html_single/#entity-hibspec-collection I noticed they tend to annotate the methods. So should I put my annotations before methods, like this: @Entity public class Flight implements Serializable { private long id; @Id @GeneratedValue public long getId() { return id; } public void setId(long id) { this.id = id; } } Or is it better to do it like this: @Entity public class Flight implements Serializable { @Id @GeneratedValue private long id; public long getId() { return id; } public void setId(long id) { this.id = id; } } Or maybe there's no difference?

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• Need some help in understanding SSL concepts

  - by user1115256

  I am new to SSL programming and finding some difficulties in understanding SSL concepts. I tried to get it through openssl site,but it is not much informative. Here is my doubts. What is difference between SSL Buffer and BIO buffer..? I mean layerwise detail will be very helpful. Can I use SSL_Write and SSL_Read without setting any BIO object to SSL object..? What exactly BIO_flush will do... I mean is it going to flush all the data to network buffer from BIO buffer.. ? If it is possible to do write and read data from SSL directly without using any BIO object then is it possible to flush the data from SSL buffer to network buffer by any means.. ? It would be very helpful if any body explain these things or giving any links where I can find answers to my questions.

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• Find location of current m-file in Matlab

  - by Jordi

  I'm working on my Matlab code in a number of different locations and it would really help if I could make the code aware of its location on the computer. I think there is a function that gives me exactly this information, but I can't remember what it is called or find it on Google. The idea is that I have a function myFunc that needs a file in its own directory, which can be in different locations on different computers. So in myFunc I want to do something like this: dir = theFunctionImLookingFor; system(fullfile(dir, 'someApp.exe')); (it could also be that the function I'm looking for doesn't return the directory, but the directory + m-file name, but that makes little difference to me) Thanks for any help!

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• Appending html code to a section inside a dialog window isn't working in IE6

  - by user338413

  I'm using jQuery's validation on a form. When the form is validated, I'm using a submitHandler to fill a dialog with data from the form then I open the dialog to display it. Works great except for in IE6. Nothing displays. I've tried initializing the dialog before and after running the validation code but neither makes a difference. Here's the validation code: $("#acct").validate({ ... submitHandler: function() { fillVerificationDialog(); $("#verification_dialog").dialog('open'); return false; } }); Here's the fillVerificationDialog: function fillVerificationDialog() { $("#dialog-data").empty(); $("<span class='label'>").text("First Name: ").appendTo("#dialog-data"); $("<span class='value'>").text($("#firstname").val()).appendTo("#dialog-data"); $("<br/>").appendTo("#dialog-data"); ... }

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• jQuery UI Slider Problem

  - by OneNerd

  I have been using jQuery sliders for about a week now without issues in my project, but I just hit an issue. I am adding 3 sliders to my page All 3 are added exact same way (like this): $('#slider_id').slider({value:100,'slide':function(e, ui){// some code}}); 2 work properly One does not work (it gives me a fiebug error 'f is undefined') when I drag the slider handle The only glaring difference I can see is that the one giving the error is inside of a jQuery UI dialog(). Interestingly, when I place it outside of the dialog, it works! So, wondering if there are known issues with sliders inside dialogs, and/or if there are any workarounds. Thanks

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• What is the time taken by java to call a method in another package?

  - by satish

  I have an assignment where i need to do feasibility study on two of my approaches and find optimized one. There are two packages A and B User input is gathered in A and then sent to B for execution. Now my approaches are 1. Call B methods from package A one by one. 2. Create a common method in B and send all the input as parameters. Which is feasible and best one, I know 2 is good in terms of code optimization and less number of calls. But, I want to understand what will be the execution time difference in above approaches How much time does java take to call method in another package? Is there any default value like x nano seconds or y milli seconds. Based on the time taken I can choose the appropiate one. Thanks

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• creating BeanInfo objects in NetBeans 6.1 does not work for some objects

  - by Coder

  I have recently learned about BeanInfo classes in Java, and have successfully used them to add icons to my custom GUI components which extend swing components such as JTextField, however i have a more specialized GUI component which extends from another one of my GUI components, which then extends from JTextField. Ie. the class hierarchy is of the form "A - B - JTextField". I can create a bean info object that works for class B, but when i click on the bean info editor option in netbeans to create a bean info object for class A, nothing happens. Ie. there is no error pop-up and a bean info object is not created. There isn't much difference between class A and B. Both A and B have default no argument constructors and they are very similar to each other. The only thing i can really think of is that A uses generics and B does not. I would like to create a beaninfo object for class A so that i can add custom icons for that component. Any help would be appreciated. Thanks.

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• Programatically opening an xml file in MS Word

  - by Dan Revell

  I'm opening an xml file in Microsoft Word 2007 using C#. I'm using an xsl file to define the layout which worked up to the point that I needed to include an image. I used the typical src html tag and the image displays when the xml is viewed in ie but not when it's opened in Word. I get the image place holder so I can only assume Word simply can't find the image. It's sitting next to both the xml file and xsl file but that doesn't make any difference. To open the document I'm passing the filenames for both the xml and xsl. I would imagine that as the src is in the xsl it would just look relative to one of these files. Any suggestions would be much appreciated. [EDIT] Apologies I lost track of this one. I fixed it in the end. I'll check what my solution was tomorrow and update this.

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• DJANGO complex modelling

  - by SledgehammerPL

  Hello. I have such model now: receipt contains components. component contain product. The difference between component and product is, that component has quantity and measure unit: eg. component is 100g sugar - sugar is a product. So I need to make lots of components to satisfy different recipes - 100g sugar is not equal 200g sugar I wonder if I can remodel it to kick off components - in pure sql it's rather easy, but I'm trying to USE django - not making workarounds. class Receipt(models.Model): name = models.CharField(max_length=128) (...) components = models.ManyToManyField(Component) class Component(models.Model): quantity = models.FloatField(max_length=9) unit = models.ForeignKey(Unit) product = models.ForeignKey(Product) class Product(models.Model): name = models.CharField(max_length = 128) TIA

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• What characters are widely supported in CSS class names?

  - by last-child

  As detailed here among other places, the only valid characters in a html/css class name is a-z, A-Z, 0-9, hyphen and underscore, and the first character should be a letter. But in practice, what characters are in fact supported by most browsers? More specifically, I wonder what browsers properly understands a slash (/) in a class name, and what browsers support class names starting with a number. I'm primarily interested in getting an answer for html rather than xhtml, in case there is a difference. Thank you.

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• Reducing number of include files to reduce server load/speed up site?

  - by rein

  You can reduce the number of HTTP requests to speed up your site, such as css sprite images. I'm wondering does reducing the number of php includes/requires also speed up your site or reduce server load? For example, I have a index.php with <?php include './file.php'; ?> If instead I copy and paste the code from file.php and just put it into index.php, thus removing the include code, would it reduce the server load? This might make things less organized, but if it does reduce server load I might need to do that. For a small to medium sized site, I assume there might not be a difference, but how about for high traffic sites? Thanks in advance.

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• Jquery-Different between event.target and this keyword?

  - by Jerry

  Hi all Got a quick and might be an newbie question. What is the different between event.target and this? let's say I have $("test").click(function(e){ $thisEventOb=e.target; $this=this; alert($thisEventObj); alert($this); }); I know the alert will pop different value. Anyone could explain the difference? Thanks a million.

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• Navigation Dropdown Text Color doesn't work in FF and IE

  - by Genadinik

  Hello, I was able to get the navigation dropdown to show the letters in a different color from the background (white in this case) in Chrome browser. But when I view the same page in IE or FF, the whole background is just all green. Here is an example of such a page: http://www.comehike.com/hikes/hikes_and_groups.php And here is the CSS code that makes the color show up white in Chrome navigation li li a {color:#white; text-decoration:none;} To see the difference, just mouse over the top right where it says "community" or "hikes" Thanks, Alex

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• Just when I thought my site was working right, it screws up in IE7

  - by John

  I thought I'd done quite well, my site passed XHTML1.0 strict validation and worked flawlessly in IE6 as well as looking fine in IE8 & Chrome. I glibly thought that it it worked in IE6 & 8, IE7 was bound to be OK. But on checking I see one of my has a scrollbar in IE7, the seems about 200% as wide as it should be... the content is fine but you can scroll the whole . 2 separate pages have this issue, a 3rd does not, even though all pages use the same layout template - the main difference on the 2 that break is a floated div. Are there known issues specifically in this area with IE7? Or do I have to embarrass myself by posting a link to the site?

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