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• Undocumented Mac Calls

  - by Brian Postow

  I'm working on a couple of mac products, and in order to do what I need to do, I'm using some calls to undocumented methods on Mac Classes. Like IKImageView's doRotate:(id) and PDFDocument's (NSPrintOperation *)getPrintOperationForPrintInfo:(NSPrintInfo *)printInfo autoRotate:(BOOL)doRotate; How common is it for Objective C programmers to use methods like this? How do you find out about them (other than Google)? How dangerous is it to use them? Is there a danger other than that Apple will make them no-longer available in some future rev, and so your program will break?

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• print matrix in dialog box

  - by Edan

  Hello, I'm having a little difficulty to print a matrix array on dialog box. The matrix is integer and as far as i understood i need to change it into string? anyway, here's the code: public void print_Matrix(int row, int column) { for (int i = 0; i <= row; i++) { for (int j = 0; j <= column; j++) { JOptionPane.showMessageDialog(null, matrix_Of_Life); } } what I need to do in order to print array into dialog box? thanks.

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• Dialog is not defined

  - by Clay McClure

  I'm building my first Facebook Connect application, and am running into an odd problem. This example code: <script type="text/javascript" charset="utf-8"> FB.init("{{ FACEBOOK_API_KEY }}", "{% url xd_receiver %}"); FB.ensureInit(function() { var invite_dialog; function showInviteDialog() { invite_dialog = new Dialog(Dialog.DIALOG_POP).showMessage('Share with Friends', invite_friends_selector, null, null); } function hideInviteDialog() { invite_dialog.hide(); } showInviteDialog(); }); </script> keeps throwing the error: Dialog is not defined Is Dialog available in Facebook connect/XFBML applications? Do I need to do anything special in order to use it? Thanks in advance!

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• Regex to detect a proper permalink?

  - by Fedor

  These permalinks above are rerouted to my page: page.php?permalink=events/foo page.php?permalink=events/foo/ page.php?permalink=ru/events/foo page.php?permalink=ru/events/foo/ The events is dynamic, it could be specials or packages. My dilemma is basically; I need to detect an empty link in order so I can feed a robots no index meta tag in the case of: page.php?permalink=events page.php?permalink=events/ page.php?permalink=ru/events/ page.php?permalink=ru/events I can't use a simple pattern such as [a-zA-Z]+\/?(.+)/ since it won't work on the i18n permalinks. What regex could I use which would detect this, using $_GET['permalink'] as the reference to the permalinks? And avoid false positives? Update: Empty link means there's no fragment after the "events/" part. These are empty: page.php?permalink=events page.php?permalink=events/ page.php?permalink=ru/events/ page.php?permalink=ru/events

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• MySQL GROUP BY and JOIN

  - by christian

  Guys what's wrong with this SQL query: $sql = "SELECT res.Age, res.Gender, answer.*, $get_sum, SUM(CASE WHEN res.Gender='Male' THEN 1 else 0 END) AS males, SUM(CASE WHEN res.Gender='Female' THEN 1 else 0 END) AS females FROM Respondents AS res INNER JOIN Answers as answer ON answer.RespondentID=res.RespondentID INNER JOIN Questions as question ON answer.Answer=question.id WHERE answer.Question='Q1' GROUP BY res.Age ORDER BY res.Age ASC"; the $get_sum is an array of sql statement derived from another table: $sum[]= "SUM(CASE WHEN answer.Answer=".$db->f("id")." THEN 1 else 0 END) AS item".$db->f("id"); $get_sum = implode(', ', $sum); the query above return these values: Age: 20 item1 0 item2 1 item3 1 item4 1 item5 0 item6 0 Subtotal for Age 20 3 Age: 24 item1 2 item2 2 item3 2 item4 2 item5 1 item6 0 Subtotal for Age 24 9 It should return: Subtotal for Age 20 1 Subtotal for Age 24 2 In my sample data there are 3 respondents 2 are 24 yrs of age and the other one is 20 years old.

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• Using non primitive types in ServiceOperation for WCF Data Service (3.5SP1)

  - by Nix

  Is there any way at all to create a "mock" entity type for use in a WCF Service Operation? We have some queries we do that we need to optimize by exposing as a ServiceOperation. The problem is in order to do so we would result in a very long list of primitative types... Ex SomeoneHelpMe(int time, string name, string address, string i, string purple, string foo, int stillGoing, int tooMany, etc...) And we really need to reduce this to SomeoneHelpedMe(CustomEntityNotMappedToAnything e) This would also help us when it comes time to write some complex queries since there is a 3 param limitation... I saw this will be possible in 4.0 using "complex types", but i am still in the 3.5SP1 world. Let me know if anyone needs more information.

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• MYSQL - Selecting a specific date range to get "current" popular screensavers.

  - by Joe

  Let's say I have a screensaver website. I want to display the CURRENT top 100 screensavers on the front page of the website. What I mean is, "RECENT" top 100 screensavers. What would be an example query to do this? My current one is: SELECT * FROM tbl_screensavers WHERE WEEK(tbl_screensavers.DateAdded) = WEEK('".date("Y-m-d H:i:s",strtotime("-1 week"))."') ORDER BY tbl_screensavers.ViewsCount, tbl_screensavers.DateAdded This will select the most viewed ("tbl_screensavers.ViewsCount") screensavers that were added ("tbl_screensavers.DateAdded") in the last week. However, in some cases there are no screensavers, or less than 100 screensavers, submitted in that week. So, how can I perform a query which would select "RECENT" top 100 screensavers? Hopefully you have an idea of what I'm try to accomplish when I say "RECENT" or "CURRENT" top screensavers. -- aka. the most viewed, recently - not the most viewed, all-time.

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• IE7 resize problems

  - by moshe_ravid

  i have a page that contains content which need to be dynamically changed according to the current page size. in order to do that, during the onload event, i attach some JS function to the "onresize" window event. it looks like that: window.onresize = function() { //do something here... }; This is working fine in any browse, except IE7! These are the problems i'm having: It seems that in IE7, when i resize the window vertically only (i.e. clicking with the mouse on the bottom border, and drag it down), it does not fire the "onresize" event. sometimes, i get an infinite loop of "onresize" event, causing the browser to hang forever. I will appreciate any help with any of these issues. thanks, Moe

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• PHP MySQLi timeout on locked tables?

  - by Marcin

  Hi guys I have a weird problem with mysqli timeout options, here you go: I am using mysqli_init() and real_connect() in order to set MYSQLI_OPT_CONNECT_TIMEOUT $this->__mysqli = mysqli_init(); if(!$this->__mysqli->options(MYSQLI_OPT_CONNECT_TIMEOUT,1)) throw new Exception('Timeout settings failed') $this->__mysqli->real_connect(host,user,pass,db); .... Then I am initiating query on locked table (LOCKE TABLE users WRITE) and its just hanging, ignoring all my settings even: set_time_limit(1); ini_set('max_execution_time',1); ini_set('default_socket_timeout',1); ini_set('mysql.connect_timeout',1); I understand why set_time_limit(1) and max_execution_time is ignored but why other timeouts and especially MYSQLI_OPT_CONNECT_TIMEOUT are ignored and how to solve it. I am using PHP 5.3.1 on Windows and Linux boxes, please help.

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• Extend LDAP Membership to append a prefix/sufix to the username

  - by Romias

  Our web applications are using LDAP Membership Provider to authenticate and register users in Active Directory. In order to allow users to provide usernames that exist in other applications, we need to add a prefix in its username and it should be as transparent and painless as possible. What I need is a way to extend the LDAP Membership Provider to be able to add (concatenate) a prefix to the username just before Membership authenticate or register it. For example, if user input is "JohnS" in application 1... I want to authenticate: "App1_JohnS". How could I extend the membership to accomplish this? Any idea what is triggered just before authenticate and register (create user)? Update: Each web app has an "OU" in AD where create users to and authenticate from. But as it is just ONE Active Directory Controller the usernames must be unique. We need to solve this issue using Membership providers and not adding more ADs.

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• Access Violation Exception only appearing when running C# app without debugger attached

  - by Jon

  I have an application that works fine in Visual Studios 2008, and I am trying to get it into VS 2010 in order to use .NET 4, and I have a really weird problem. When I run the code from either Release mode or Debug mode with the debugger attached (F5), I have no problems running the program. However, when I run the program from either Release or Debug without the debugger attached (Shift+F5), I get an Access Violation Exception when I attempt to run some code in a dll from GDCM. I've created the dlls by using CMake and Swig and following the instructions here adjusting the instructions where necessary to build for VS 2010 and .NET 4. Does any one have any ideas why this is happening and how I can fix it?

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• How can I retain carriage returns when I'm encrypting data?

  - by William Calleja

  I have this following setup, a textarea named with some data in it that may have carriage returns and another textarea that has style='display:none' in order to make it hidden as follows: <textarea id="myTextarea" onBlur="encryptMyData()"></textarea> <textarea name="encryptedText" style='display:none'></textarea> the user enters data in the first textarea and when that text area loses focus the 'encryptMyData()' javascript function is calling an ajax call to take whatever the user entered in the first textfield, encrypt it using rijndael, and paste it in the encryptedText textarea so that it is stored in the database later. Now what I need to do is this, find a way to convert the carriage returns before encryption to a tag like so [cr] so that when I retrieve the data, all formatting is retained. Any idea how I do this? I'm using asp.net and c# to perform the encryption.

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• DLL export of a static function

  - by Begbie00

  Hi all - I have the following static function: static inline HandVal StdDeck_StdRules_EVAL_N( StdDeck_CardMask cards, int n_cards ) Can I export this function in a DLL? If so, how? Thanks, Mike Background information: I'm doing this because the original source code came with a VS project designed to compile as a static (.lib) library. In order to use ctypes/Python, I'm converting the project to a DLL. I started a VS project as a DLL and imported the original source code. The project builds into a DLL, but none of the functions (including functions such as the one listed above) are exported (as confirmed by both the absence of dllexport in the source code and tools such as DLL Export Viewer). I tried to follow the general advice here (create an exportable wrapper function within the header) to no avail...functions still don't appear to be exported.

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• Optimising SQL distance query

  - by Alex

  I'm running an MySQL query that returns results based on location. However I have noticed recently that its really slowing down my PHP app. I used CodeIgniter and the profiler shows the query taking 4.2seconds. The geoname table has 500,000 rows. I have some indexes on the key columns, how else can speed up this query? Here is my SQL: SELECT `products`.`product_name`, `geoname`.`geonameid`, `geoname`.`latitude`, `geoname`.`longitude`, `products`.`product_id`, AVG(ratings.vote) as rating, count(comments.comment_id) as total_comments, (6371 * acos(cos(radians(38.7666667)) * cos(radians(geoname.latitude)) * cos(radians(geoname.longitude) - radians(-3.3833333)) + sin(radians(38.7666667)) * sin(radians(geoname.latitude)))) AS distance FROM (`foods`) JOIN `geoname` ON `geoname`.`geonameid` = `products`.`geoname_id` LEFT JOIN `ratings` ON `ratings`.`var_id` = `products`.`product_id` LEFT JOIN `comments` ON `comments`.`var_id` = `products `.`product_id` WHERE `products`.`product_id` != 82 GROUP BY `products`.`product_id` HAVING `distance` < 99 ORDER BY `distance` LIMIT 10

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• Avoid generating empty STDOUT and STDERR files with Sun Grid Engine (SGE) and array jobs

  - by vy32

  I am running array jobs with Sun Grid Engine (SGE). My carefully scripted array job workers generate no stdout and no stderr when they function properly. Unfortunately, SGE insists on creating an empty stdout and stderr file for each run. Sun's manual states: STDOUT and STDERR of array job tasks will be written into dif- ferent files with the default location .['e'|'o']'.' In order to change this default, the -e and -o options (see above) can be used together with the pseudo-environment-vari- ables $HOME, $USER, $JOB_ID, $JOB_NAME, $HOSTNAME, and $SGE_TASK_ID. Note, that you can use the output redirection to divert the out- put of all tasks into the same file, but the result of this is undefined. I would like to have the output files suppressed if they are empty. Is there any way to do this?

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• Neither Invalidate() nor Refresh() invokes OnPaint()

  - by user181813

  I'm trying to get from Line #1 to Line #2 in the below code: using System; using System.Windows.Forms; namespace MyNameSpace { internal class MyTextBox : System.Windows.Forms.TextBox { protected override void OnEnabledChanged(EventArgs e) { base.OnEnabledChanged(e); Invalidate(); // Line #1 - can get here Refresh(); } protected override void OnPaint(PaintEventArgs e) { base.OnPaint(e); System.Diagnostics.Debugger.Break(); // Line #2 - can't get here } } } However, it seems that neiter Invalidate() nor Refresh() causes OnPaint(PaintEventArgs e) to be invoked. Two questions: Why doesn't it work? If it can't be fixed: I only want to invoke OnPaint(PaintEventArgs e) in order to access the e.Graphics object - is there any other way to do this?

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• tips for learning from opensource

  - by dole doug

  Hi there, Besides practice(practice and more practice) reading books and forums, analyzing others people code is a must in order to have a career in this field. The problem is that I'm a student(feels like always on learning stage) but sometimes i can't solve the problems by my own. I was thinking that on public open source repositories might be the answer I'm looking for. My question is how can i find the answer to some of my problems in open source projects/community? Do you have any tips to share for me? ty

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• Portable applications for phones?

  - by peoro

  What's the best way to write an application in order to get it working on the several phones out there (iPhone, symbian-based, xpPhone, and so on)? The idea I have in mind is that of writing a few interfaces to abstract from phone-dependent stuff (ie: some Input/Output interfaces), implementing such interfaces on the several phones and then writing an application that doesn't use any phone-dependent thing. But is this really possible? What would be the language I should choose for my interfaces and applications? (would love to use C++, hopefully even with GCC extensions) Is there any project that aims to offer what I need? (maybe something like SDL?)

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• Django query: Count and Group BY

  - by Tyler Lane

  I have a query that I'm trying to figure the "django" way of doing it: I want to take the last 100 calls from Call. Which is easy: calls = Call.objects.all().order_by('-call_time')[:100] However the next part I can't find the way to do it via django's ORM. I want to get a list of the call_types and the number of calls each one has WITHIN that previous queryset i just did. Normally i would do a query like this: "SELECT COUNT(id),calltype FROM call WHERE id IN ( SELECT id FROM call ORDER BY call_time DESC LIMIT 100 ) GROUP BY calltype;" I can't seem to find the django way of doing this particular query. Here are my 2 models: class Call( models.Model ): call_time = models.DateTimeField( "Call Time", auto_now = False, auto_now_add = False ) description = models.CharField( max_length = 150 ) response = models.CharField( max_length = 50 ) event_num = models.CharField( max_length = 20 ) report_num = models.CharField( max_length = 20 ) address = models.CharField( max_length = 150 ) zip_code = models.CharField( max_length = 10 ) geom = models.PointField(srid=4326) calltype = models.ForeignKey(CallType) objects = models.GeoManager() class CallType( models.Model ): name = models.CharField( max_length = 50 ) description = models.CharField( max_length = 150 ) active = models.BooleanField() time_init = models.DateTimeField( "Date Added", auto_now = False, auto_now_add = True ) objects = models.Manager()

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• Running a shellscript from a C++ application and check if it succeeds

  - by Koning Baard

  I am creating an interpreter for my extension to HQ9+, which has the following extra command called V: V: Interpretes the code as Lua, Brainfuck, INTERCAL, Ruby, ShellScript, Perl, Python, PHP in that order, and if even one error has occoured, run the HQ9+-ABC code again most of them have libraries, BF and INTERCAL can be interpreted without a library, but the problem lies in ShellScript. How can I run a shellscript from my C++ application ( =the HQ9+-ABC interpreter) and when it's done, get the error code (0 = succeded, all others = failed)? So something like this: system(".tempshellscript738319939474"); if(errcode != 0) { (rerun code); } can anyone help me? Thanks

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• Issues with dynamically loading modules in code with Silverlight/Prism

  - by Greg Bailey

  In my Bootstrapper.cs in GetModuleCatalog, I need to specify the Module types using the typeof(ModuleType). In the example below I'm trying to load the Contact module on demand, but in order to get it into my module catalog, I need to have a reference to it in the project that holds my Bootstrapper. When I add a reference to Contact, then the Contact.dll gets added to the initial xap file, which defeats the purpose of loading the module dynamically. Am I missing something? Do you have to load the module catalog from a file to make this work? var catalog = new ModuleCatalog(); catalog.AddModule(typeof(Core)); catalog.AddModule(typeof(Contact), InitializationMode.OnDemand);

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• Python list comprehension to return edge values of a list

  - by mvid

  If I have a list in python such as: stuff = [1, 2, 3, 4, 5, 6, 7, 8, 9] with length n (in this case 9) and I am interested in creating lists of length n/2 (in this case 4). I want all possible sets of n/2 values in the original list, for example: [1, 2, 3, 4], [2, 3, 4, 5], ..., [9, 1, 2, 3] is there some list comprehension code I could use to iterate through the list and retrieve all of those sublists? I don't care about the order of the values within the lists, I am just trying to find a clever method of generating the lists.

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• Are there any differences between SQL Server and MySQL when it comes to preventing SQL injection?

  - by Derek Adair

  I am used to developing in PHP/MySQL and have no experience developing with SQL Server. I've skimmed over the PHP MSSQL documentation and it looks similar to MySQLi in some of the methods I read about. For example, with MySQL I utilize the function mysql_real_excape_string(). Is there a similar function with PHP/SQL Server? What steps do I need to take in order to protect against SQL injection with SQL Server? What are the differences between SQL Server and MySQL pertaining to SQL injection prevention? also - is this post accurate? is the escape string character for SQL Server a single quote?

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• Where to start with Direct2d?

  - by ShrimpCrackers

  Interested in learning Direct2d to create a Windows 8 app, but after 2 hours of research I'm thoroughly confused. Samples like this (Creating a Simple Direct2D Application) seem to assume you know what an HWND and HRESULT is, and how the Windows API works in general. My question is this: do you need an understanding of the Win API, COM, OLE, and all this other Windows stuff in order to get a good grasp on Direct2d/3d? All the other barebones tutorials assume that you know all this stuff and I don't really know where to start. The startup D2D project in VS 2012 gives you a bunch of files but there's no main or WinMain... How does this program even start?

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• How do laziness and I/O work together in Haskell?

  - by Bill

  I'm trying to get a deeper understanding of laziness in Haskell. I was imagining the following snippet today: data Image = Image { name :: String, pixels :: String } image :: String -> IO Image image path = Image path <$> readFile path The appeal here is that I could simply create an Image instance and pass it around; if I need the image data it would be read lazily - if not, the time and memory cost of reading the file would be avoided: main = do image <- image "file" putStrLn $ length $ pixels image But is that how it actually works? How is laziness compatible with IO? Will readFile be called regardless of whether I access pixels image or will the runtime leave that thunk unevaluated if I never refer to it? If the image is indeed read lazily, then isn't it possible I/O actions could occur out of order? For example, what if immediately after calling image I delete the file? Now the putStrLn call will find nothing when it tries to read.

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