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• how can I develop Apple Java Extensions on Windows?

  - by carneades

  When I do multi-platform testing on Windows it gets annoying that Eclipse shows errors in the project because of the com.apple.eawt code that I have in a special Mac customization task. Worse yet, if I export a runnable jar on Windows, it won't run on mac because of the unresolved compilation problems. What's the best way to let Windows Java and com.apple.eawt live in peace? I can't see how I would be able to spin off the code to a jar, since it requires access to lots of the program's state. Thanks for your help! UPDATE: I've posted a jar to Sourceforge that solves this problem: http://sourceforge.net/projects/javaextensions/

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• Function matching in Qt

  - by Alexander

  Hello, I have some trouble with Qt. I have a class 'Core' class Core { public: static QString get_file_content(QString filename); static void setMainwindow(MainWindow *w); private: static MainWindow *main_window; }; and class 'MainWindow' in namespace Ui: namespace Ui { class MainWindow; } class MainWindow : public QMainWindow { Q_OBJECT public: MainWindow(QWidget *parent = 0); ~MainWindow(); private: Ui::MainWindow *ui; }; In MainWindow constructor I make MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWindow) { ui->setupUi(this); Core::setMainwindow(this); } and gets error mainwindow.cpp:8: error: no matching function for call to 'Core::setMainwindow(MainWindow* const)' Of cource, i include core.h with declaration of 'Core' class. That's occurs only on setMainwindow method. So the questions is - why Core class method setMainwindow() is invisible in MainWindow class?

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• .NET DataGridView rows' default alignment all set to left

  - by Xster

  DataGridView gets bound to DataTable. I then try to set some columns' DefaultCellStyle.Alignment to right. It doesn't work. After a bunch of tinkering, it turns out that every single row's DefaultCellStyle.Alignment is set to left and overrides it. DataGridView.DefaultCellStyle or RowsDefaultCellStyle doesn't do anything. Makes sense since a particular row's DefaultCellStyle is more specific but what gives. Why are they all set to something and not NotSet? How do I get rid of it instead of iterating through all rows?

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• ASP MVC 2: Regular expression attribute working on clientside but not on serverside

  - by wh0emPah

  [Required(ErrorMessage = "Date is required")] [RegularExpression(@"^(((0[1-9]|[12]\d|3[01])\/(0[13578]|1[02])\/((1[6-9]|[2-9]\d)\d{2}))|((0[1-9]|[12]\d|30)\/(0[13456789]|1[012])\/((1[6-9]|[2-9]\d)\d{2}))|((0[1-9]|1\d|2[0-8])\/02\/((1[6-9]|[2-9]\d)\d{2}))|(29\/02\/((1[6-9]|[2-9]\d)(0[48]|[2468][048]|[13579][26])|((16|[2468][048]|[3579][26])00))))$", ErrorMessage="Date is not valid must be like (dd/mm/jjjj)")] public DateTime Startdate{ get; set;} The client-side validation works perfectly. So it seems that JavaScript can successfully understand my regular expression. But when I do a postback, and the modelstate.Isvalid() gets called. My date isn't valid anymore. So I'm guessing that when .NET performs the matching with the regEx it doesn't match. My question: Why does this regular expression match on the client side but not on the server side?

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• Make is more OOPey - good structure?

  - by Tom

  Hi, I just want advice on whether I could improve structure around a particular class which handles all disk access functions The structure of my program is that I have a class called Disk which gets data from flatfiles and databases on a, you guessed it, hard disk drive. I have functions like LoadTextFileToStringList, WriteStringToTextFile, DeleteLineInTextFile etc which are kind of "generic methods" In the same class I also have some more specific methods such as GetXFromDisk where X might be a particular field in a database table/query. Should I separate out the generic methods from the specialised. Should I make another class which inherits the generic methods. At the moment my class is static as there is no need to have an internal state of the class. I'm not really OOPing am I? Thanks Thomas

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• pySerial writes to Arduino Uno get buffered

  - by Bhaktavatsalam Nallanthighal

  I have a Python script that writes short messages to the serial port on my Arduino Uno board using pySerial. There is a loop and depending on some conditions, multiple writes can happen within a loop, something like this: while True: #Conditions block 1 if <CONDITION1>: serial.writelines("INIT") elif <CONDITION2>: serial.writelines("NEW") ... #Conditions block 2 if <CONDITION1>: # Fetch something from the Internet serial.writelines("CHECK") elif <CONDITION2>: # Fetch something from the Internet serial.writelines("STOP") ... But, when my Arduino board receives this it receives the first message as INIT, but the second one is being read as INITSTOP or INITCHECK and third one gets concatenated to the previous messages. My arduino program checks for specific message in this way: if(msg.equals("CHECK")) { // Do something } else if(msg.equals("INIT")) { // Do Something else } Can anyone guide me on this? BTW, I don't think the problem is with the Arduino as it works perfectly when I test it with the Serial Monitor available with the IDE. I've tried adding sleeps of upto 10 seconds before every write, but that did not work out.

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• Dismissing pickers and keyboards invoked by a UIWebView

  - by Dev Kanchen

  I am implementing an in-app browser using UIWebView, that shows an 'action' button up-top that - when tapped - scales the UIWebView and allows the user to perform some other actions. If, however, at the point of tapping this 'action' button, the user were entering some text on the webview, or using a picker to select an option from a drop-down list, then the webview gets scaled without dismissing the keyboard/picker. Apart from being ugly, this also obscures my main view and controls. So is there a way to make a UIWebView dismiss all associated input controls, such as keyboards/pickers, when asked to? I tried using [myWebView resignFirstResponder] but that didn't work. Any ideas? Thanks.

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• jqueryForm and empty uploads

  - by Aiden Bell

  Hi All, Been scratching my head for too long on this: Using jquery.form, (http://malsup.com/jquery/form) with PHP ... my $_FILES['someimage'] gets set but the error number is always UPLOAD_ERR_NO_FILE, size is also 0. The JavaScript: $('form input[type=file]').change(function(){ $(this).clone().appendTo('#imgform'); $('#imgform').ajaxForm(); $('#imgform').ajaxSubmit( { type:'POST' } ); }); Which appends to: <form id="imgform" method="POST" action="/api/images.php" enctype="multipart/form-data"></form> From another form which has bog-standard file inputs. PHP logs are clean, but var_dumping $_FILES always shows that the index is set to the name of the form element ... but no data. Thanks guys! (Sorry, I know jQuery-like questions are too frequent round these parts).

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• How do you perform macro expansion within #ifdef?

  - by Malvineous

  Hi all, I have some fairly generic code which uses preprocessor macros to add a certain prefix onto other macros. This is a much simplified example of what happens: #define MY_VAR(x) prefix_##x "prefix_" is actually defined elsewhere, so it will be different each time the file is included. It works well, but now I have some code I would like to skip if one of the tokens doesn't exist, but this doesn't work: #if defined MY_VAR(hello) What I want it to expand to is this: #ifdef prefix_hello But I can't figure out how. I need to use the MY_VAR() macro to do the expansion, so I can't just hardcode the name. (It's actually for some testing code, the same code gets included with a different prefix each time to test a bunch of classes, and I want to skip a couple of tests for a handful of the classes.) Is this possible with the C++ preprocessor?

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• Intermec PF8t printer - print output with wrong orientation

  - by Xience

  I am using an Intermec PF8t for label printing. My labels are the size of 40mm(width) and 20mm (height) and they are rendered in a crystal report from where I print them dynamically. The problem is that no matter what the page orientation I specify either in crystal report or in printer settings, the result is printed vertically(i.e. my output gets rotated by 90 degrees) whereas I want it to print horizontally (as in normal left to right printing) . Strangely, when I print the label at design time, everything prints as it should. One important thing to mention is that i print my label report programmatically using crystal reprot's PrintToPrinter() method. Any ideas... I have pretty much exhausted all the information available at intermec's portal but to no avail.

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• php custom forum error

  - by phillip morris

  i have a form, and i want to have it be limited at 10 characters minimum. that is no problem, but what i want to do is echo the error at the top of the page, which is being included, so i cant just do: echo '<div class="error">Error</div>'; i want to have a designated div that is empty (will be on the included header page), but when there is an error it gets filled with the error text to output. anyone know how to do this not using sessions or cookies?

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• source control when starting up a new project

  - by jaras

  when starting with a project and using source control i find it hard to separate the things people are working on so they don't either write duplicate code or think it should be named one thing and so on. this problem diminishes over time because the general foundation is in place and it's easier to separate the tasks so they don't overlap as much how do you manage working with source control in the beginning phase? EDIT: I can see that it don't really have anything to do with source control, but it gets more apparent when you have source control too. so the question becomes more along the lines of "how do you manage to separate the tasks so they don't overlap too much. I think it's really hard and i haven't really seen much about how to do it.

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• How do I include 2 tables in one LocalStorage item?

  - by Noor

  I've got a table that you can edit, and I've got a simple code saving that list when you're done with editing it. (the tables have the contenteditable on) The problem I've stumbled upon is that if I double click on enter, the table gets divided into two separate tables with the same ID. This causes the code I'm using to set the localStorage to only store one of the tables (I assume the first).. I've thought of different solutions and I wonder if someone could point out the pro's and con's (if the solutions even works that is). Make a loop that checks the page after tables and stores them into an array of localStorage-items.. I'd have to dynamically create a localStorage item for each table. Take the whole div that the tables are in, and store that in the localStorage, when a user revisits the page, the page checks after the items in storage and displays the whole divs. Any suggestions you have that can beat this :).. (but no cache, it has to be with the localStorage!) Thanks

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• ASP.NET Web User Control with Javascript used multiple times on a page - How to make javascript func

  - by Jason Summers

  I think I summed up the question in the title. Here is some further elaboration... I have a web user control that is used in multiple places, sometimes more than once on a given page. The web user control has a specific set of JavaScript functions (mostly jQuery code) that are containted within *.js files and automatically inserted into page headers. However, when I want to use the control more than once on a page, the *.js files are included 'n' number of times and, rightly so, the browser gets confused as to which control it's meant to be executing which function on. What do I need to do in order to resolve this problem? I've been staring at this all day and I'm at a loss. All comments greatly appreciated. Jason

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• Eidetic memory: What magic numbers you still remember?

  - by Hao

  Long before you practice writing readable code, what "magic numbers" you still remember up to this day? here's some of my list: 72 80 75 77 13 32 27 - up down left right enter space escape 1 2 4 128 - blue green red blink 67h 33h 17h - interrupt for EMS, mouse, printer function AH 9, interrupt 21 alt+219 for block ASCII alt+164 ñ 90 NOP 13 10 carriage return, line feed ascii 1 and 2 face, ascii 3 heart. no not this heart: <3 :-) debug -o72,10 -o71,12 clears the BIOS password. I don't know what those numbers mean, it's like a trade secret that gets shared with each other during college days. ascii 7 sounds a beep P.S. Somehow, remembering some of these magic numbers can help you in some tech problems, your keyboard is broken, the office pal's keyboard doesn't have accented characters. An anecdote, during college, one of my friend asked me how to remove the newlines in his Word document. Not having used Word so much then, I somehow "intuitively" guessed to find ^013 and replace it with blank. Well it works :-)

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• Ruby module_function, invoking module's private method, invoked in class method style on module shows error

  - by Jignesh

  test_module.rb module MyModule def module_func_a puts "module_func_a invoked" private_b end module_function :module_func_a private def private_b puts "private_b invoked" end end class MyClass include MyModule def test_module module_func_a end end Invoking module function from class c = MyClass.new c.test_module Output 1: $ ruby test_module.rb module_func_a invoked private_b invoked Invoking module function on module in class method style ma = MyModule.module_func_a Output 2: module_func_a invoked test_module.rb:5:in `module_func_a': undefined local variable or method `private_b' for MyModule:Module (NameError) from test_module.rb:31 As can be seen from the Output 1 and Output 2 when including the module in a class, no issue occurs when a module's private method gets invoked from a module function while in case when directly invoking the module function on the module in class method style the module's private method, invoked from module function, is not found. Can anybody make me understand the reason behind above behavior and whether invoking module function (which in turn invokes module's private method) on module in class method style is possible or not? If possible, then what rectifications are required in my code to do the same? Thanks, Jignesh

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• How to make scrolling through images as fast as Apple's Photos app

  - by clozach

  The Goal — On an iPhone, to browse through several hundred locally-stored jpgs using a UIScrollView. The Problem — Like many others before me, I've tried implementing a scroll view based on Apple's Page Control sample code and found it lacking. The biggest issue I'm currently up against is that the sample code's architecture doesn't seem to scale. With just a few images loaded from disk, everything's fine. Once the number of images gets into the dozens, though, scrolling suffers terribly: the scrollview stutters mid-scroll with each new swipe. The only code I've toyed with that comes even close to being reasonably responsive is Three20, but even there the performance doesn't hold a candle to Photos. For now, I'm just using Three20, but a faster, custom solution would definitely be preferable.

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• How to control Time zone formatting in System.Xml.Serialization or during application execution?

  - by Beal

  I'm developing a C# .Net Application that is executing on a system located in the Central Time Zone. The application gets information from a third party using an API they provide. I have used the WSDL to produce the code that my application access the API with...their reporting API allows you to define a start date and end date for the report. These are C# DateTime fields and XSD:dateTime. Now when I set the start date and end dates and allow the API to create the SOAP messages the dates don't always include a Time Zone unless I set the date fields using the ToLocalTime method; however, the method will create the DateTime fields in the Central Time Zone (CST) but I need to have it create these fields in the Pacific Time Zone (PST). If I set my machine time to PST all is good...but of course that causes other time issues. What methods can I use to control the formatting of the DateTime? Alternatively, is there a application setting that can be set in C# that allows timezone control?

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• Please advise on handling the existing geek

  - by ranja

  Quick Story: I started a new job where everyone funneled their questions to 'the geek'. Being an experienced developer, I can do most of my assignments without consultation with the geek - thinks such as how to select the top 10 rows in a table. Question: Is there a preferred way of handling these cases without offending the existing geek while ensuring the best solution gets implemented? My issue is the the existing geek is very young and makes a lot of mistakes, but still sounds authoritative because the other coders are just out of school and don't know better.

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• How do I design a cryptographic hash function?

  - by Eyal

  After reading the following about why one-way hash functions are one-way, I would like to know how to design a hash function. http://stackoverflow.com/questions/1038307/help-me-better-understand-cryptographic-hash-functions/1047106#1047106 Before everyone gets on my case: Yes, I know that it's a bad idea to not use a proven and tested hash function. I would still like to know how it's done. I'm familiar with Feistel-network ciphers but those are necessarily reversible, horrible for a cryptographic hash. Is there some sort of construction that is well-used in cryptographic hashing? Something that makes it very one-way?

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• How to select all parents of a node in a hierarchical mysql table?

  - by Ehsan Khodarahmi

  I have a MySQL table that represents data for a tree GUI component, here's the structure of my table: treeTable ( id INT NOT NULL PRIMARY KEY, parentId INT, name VARCHAR(255) ); parentId is a self-referencing foreign key. Now I want to write a stored procedure which gets a node id and returns a result set that contains that node and all of its parents. For example, suppose that my table has filled with this data: 1, null, 'root' 2, 1 , 'level_1' 3, 2 , 'level_2' Now I want to get all parent nodes of node 3 (nodes 1 and 2) and return a result set that contains all tree records. Can anybody help me please?

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• Is there a recommended way to use the Observer pattern in MVP using GWT?

  - by Tomislav Nakic-Alfirevic

  I am thinking about implementing a user interface according to the MVP pattern using GWT, but have doubts about how to proceed. These are (some of) my goals: - the presenter knows nothing about the UI technology (i.e. uses nothing from com.google.*) - the view knows nothing about the model or the presenter - the model knows nothing of the view or the presenter (...obviously) I would place an interface between the view and the presenter and use the Observer pattern to decouple the two: the view generates events and the presenter gets notified. What confuses me is that java.util.Observer and java.util.Observable are not supported in GWT. This suggests that what I'm doing is not the recommended way to do it, as far as GWT is concerned, which leads me to my questions: what is the recommended way to implement MVP using GWT, specifically with the above goals in mind? How would you do it?

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• Not Seeing Ajax Requests In Firebug If Header Has Been Modified

  - by FluidFoundation

  Hey braintrust, I'm making an ajax call using jQuery's library to an api, which requires a username and password encoded to base64 be added to the header. here's a basic example: $.ajax({ type: "GET", contentType: 'application/json', beforeSend:function(xhr){ xhr.setRequestHeader("Authentication", "Basic " + base64EncodedValue); } url: 'https://api.company.com/uri/', complete: function(result) { alert(result); } }); But when this fires off, I get a black alert box, so it doesn't appear as if something is coming back. There is no log in the Firebug console that a get ajax request was done. However, if I remove the beforeSend option, I do see the ajax request get logged, but the request gets back a 'not authorized', so it definitely hit the right place. Any ideas on why it's not showing up in Firebug so I can verify the headers are being sent out correctly?

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• Can access maven repository from behind proxy, need help.

  - by Digambar Daund

  I am trying to access maven repository from behind proxy. I configured settings.xml correctly (i guess so...) true http username password 12.34.56.78 8080 But still I am error message like... if i dont configure userid/password gets correct error message which is HTTP response code 407 - saying authentication required. But If I configure correct/incorrect proxy authentication it always prints below error message.... Downloading: http://repo1.maven.org/maven2/org/apache/maven/plugins/maven-clean-plugin/2.2/maven-clean-plugin-2.2.pom [WARNING] Unable to get resource 'org.apache.maven.plugins:maven-clean-plugin:pom:2.2' from repository central (http://repo1.maven.org/maven2): Error trans ferring file: Server redirected too many times (20) Downloading: http://repo1.maven.org/maven2/org/apache/maven/plugins/maven-clean-plugin/2.2/maven-clean-plugin-2.2.pom [WARNING] Unable to get resource 'org.apache.maven.plugins:maven-clean-plugin:pom:2.2' from repository central (http://repo1.maven.org/maven2): Error trans ferring file: Server redirected too many times (20) [INFO] ------------------------------------------------------------------------ [ERROR] BUILD ERROR

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• What is lifetime of lambda-derived implicit functors in C++ ?

  - by Fyodor Soikin

  The question is simple: what is lifetime of that functor object that is automatically generated for me by the C++ compiler when I write a lambda-expression? I did a quick search, but couldn't find a satisfactory answer. In particular, if I pass the lambda somewhere, and it gets remembered there, and then I go out of scope, what's going to happen once my lambda is called later and tries to access my stack-allocated, but no longer alive, captured variables? Or does the compiler prevent such situation in some way? Or what?

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