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• Chartfx new chart object not initialized?

  - by Roy

  When I create a new chart object via: ChartFX.WebForms.Chart theChart = new ChartFX.WebForms.Chart(); When I took a look immediately the row after creation via breakpoint in Visual Studio 2005 I noticed there are 3 rows in the newly created chart that have data. Is this a bug? or do I need to call a specific function? Shouldn't the data table for the chart be initialized to all 0's?

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• polymorphism and interfaces

  - by mixm

  if i have two classes x and y, both extend class w. and x implementing interface z. if i have methods doSomething(w object) and doSomething(x object), what would happen if i call doSomething(x)? edit: im implementing this on java, more specifically on android. im asking this because some classes which implement a specific interface mostly does the same thing when doSomething() is called. but there are special cases which i would like to single out.

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• How does the event dispatch thread work?

  - by Roman

  With the help of people on stackoverflow I was able to get the following working code of the simples GUI countdown (it just displays a window counting down seconds). My main problem with this code is the invokeLater stuff. As far as I understand the invokeLater send a task to the event dispatching thread (EDT) and then the EDT execute this task whenever it "can" (whatever it means). Is it right? To my understanding the code works like that: In the main method we use invokeLater to show the window (showGUI method). In other words, the code displaying the window will be executed in the EDT. In the main method we also start the counter and the counter (by construction) is executed in another thread (so it is not in the event dispatching thread). Right? The counter is executed in a separate thread and periodically it calls updateGUI. The updateGUI is supposed to update GUI. And GUI is working in the EDT. So, updateGUI should also be executed in the EDT. It is why the code for the updateGUI is inclosed in the invokeLater. Is it right? What is not clear to me is why we call the counter from the EDT. Anyway it is not executed in the EDT. It starts immediately a new thread and the counter is executed there. So, why we cannot call the counter in the main method after the invokeLater block? import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.SwingUtilities; public class CountdownNew { static JLabel label; // Method which defines the appearance of the window. public static void showGUI() { JFrame frame = new JFrame("Simple Countdown"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); label = new JLabel("Some Text"); frame.add(label); frame.pack(); frame.setVisible(true); } // Define a new thread in which the countdown is counting down. public static Thread counter = new Thread() { public void run() { for (int i=10; i>0; i=i-1) { updateGUI(i,label); try {Thread.sleep(1000);} catch(InterruptedException e) {}; } } }; // A method which updates GUI (sets a new value of JLabel). private static void updateGUI(final int i, final JLabel label) { SwingUtilities.invokeLater( new Runnable() { public void run() { label.setText("You have " + i + " seconds."); } } ); } public static void main(String[] args) { SwingUtilities.invokeLater(new Runnable() { public void run() { showGUI(); counter.start(); } }); } }

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• Flex DataBinding Drilling Down Through Arrays

  - by Joshua

  The help page on the BindUtils.bindProperty function: http://livedocs.adobe.com/flex/3/langref/mx/binding/utils/BindingUtils.html Has this to say: "For example, to bind the property host.a.b.c, call the method as: bindProperty(host, ["a","b","c"], ...)." But what if I need to bind to host.a.b[2].c? How do I do that?

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• calling a function in a click event

  - by KATy

  hi, i ve data in d sql DB using those values i ve to call a function in the system.. data in sql location of func:c:\ namespace:calci class name:arith function name:add parameter 1: 1 parameter 2: 2 now we ve use the values c:\,calci,arith,add,1,2 using this we ve to calculate the result.. thanx..

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• Are functions declared before or after calling them?

  - by DMan

  I've made this a community wiki... Okay, I was looking through someone's code one day and I was annoyed how they declared all their functions first and then later called them below. I guess I'm use to Visual Studio's automatically generated functions, that are made after you call them- and I was wondering, which way do you prefer? Or is there a standard on these kind of things?

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• how can i access a value on a cell in tableview from different class?

  - by ahmet732

  I can hold the value of touched cell but I cannot pass that value to another class or call from that class. SearchTableViewController.m **deneme= [[NSMutableArray alloc]init]; deneme=[tableData objectAtIndex:indexPath.row]; NSLog(@"my row = %@", deneme); //I can hold one of the selected or touched rows in table HistoryTableViewController.m **SearchTableViewController *obj = (SearchTableViewController *)[self.tabBarController.viewControllers objectAtIndex:11]; NSLog(@"my 2nd row= %@", [obj deneme]); //It doesn't retrieve here

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• How to write sum calculation based on ria service?

  - by KentZhou

  When using ria service for SL app, I can issue following async call to get a group of entity list. LoadOperation<Person> ch = this.AMSContext.Load(this.AMSContext.GetPersonQuery().Where(a => a.PersonID == this.performer.PersonID)); But I want to get some calculation, for example, sum(Commission), sum(Salary), the result is not entity, just a scalar value. How can I do this?

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• Windows service porting to linux

  - by Sirish Kumar

  I am porting an application which runs as a background service in windows at startup, we are porting the application to linux(SUSE Enterprise server), I'am completely new to linux. Can somebody help me on how to proceed with this. Like Should I build the linux executable After builiding the binary, what changes should I make to linux startup files to run this executable How my service can register call back function to modify or change or send commands to my service while it is running

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• Back button of Navigation Controller does not work!

  - by JosephH

  For some reason, if I try to go back to the main menu using the back button on the upper left corner, only the title returns to the previous menu, but not the view controller. View controller would return to the previous menu only if I explicitly call popViewControllerAnimated using some other button. Is there anyway to solve this? I think I've coded something wrong. Tried googling but couldn't find any cases like mine.

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• jquery return false in form

  - by pradeep

  [CODE] function confirmSubmit() { jConfirm('Is the Appointment Confirmed?', 'Confirmation Dialog', function(r) { if(r){return true;} else {return false;} }); } [/CODE] whjen i submit the foem i call this function and use jConfirm from jquery. i print r .its printing properly like true and false.but return false or return true has no effects.it just shows ths pop up and submits the form,does not wait for confirmation. how to solve this?

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• Tips for documenting a web application?

  - by Pandiya Chendur

  I know that I can take my asp.net application and get it reversed to a UML document, but that doesn't tell the whole story of things like who can use what, what it calls in the way of stored procedures, what pages call what pages etc. etc. Does anyone know of an article where someone has a comprehensive way to document a web application/site? Or shall I just make up my own way?

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• Sequential GUID in Linq-to-Sql?

  - by JacobE

  I just read a blog post about NHibernate's ability to create a GUID from the system time (Guid.Comb), thus avoiding a good amount of database fragmentation. You could call it the client-side equivalent to the SQL Server Sequential ID. Is there a way I could use a similar strategy in my Linq-to-Sql project (by generating the Guid in code)?

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• The difference between triangulation and mesh

  - by xiao

  I have done some computer graphical programming recently, and I have no experience before. I used the library call CGAL(computer geometry algorithm library). Also, I noticed that there is class for triangulation and also class for mesh. Is mesh just a kind of triangle net? Do they have any differences? Thanks!

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• Having trouble wrapping functions in the linux kernel

  - by Corey Henderson

  I've written a LKM that implements Trusted Path Execution (TPE) into your kernel: https://github.com/cormander/tpe-lkm I run into an occasional kernel OOPS (describe at the end of this question) when I define WRAP_SYSCALLS to 1, and am at my wit's end trying to track it down. A little background: Since the LSM framework doesn't export its symbols, I had to get creative with how I insert the TPE checking into the running kernel. I wrote a find_symbol_address() function that gives me the address of any function I need, and it works very well. I can call functions like this: int (*my_printk)(const char *fmt, ...); my_printk = find_symbol_address("printk"); (*my_printk)("Hello, world!\n"); And it works fine. I use this method to locate the security_file_mmap, security_file_mprotect, and security_bprm_check functions. I then overwrite those functions with an asm jump to my function to do the TPE check. The problem is, the currently loaded LSM will no longer execute the code for it's hook to that function, because it's been totally hijacked. Here is an example of what I do: int tpe_security_bprm_check(struct linux_binprm *bprm) { int ret = 0; if (bprm->file) { ret = tpe_allow_file(bprm->file); if (IS_ERR(ret)) goto out; } #if WRAP_SYSCALLS stop_my_code(&cs_security_bprm_check); ret = cs_security_bprm_check.ptr(bprm); start_my_code(&cs_security_bprm_check); #endif out: return ret; } Notice the section between the #if WRAP_SYSCALLS section (it's defined as 0 by default). If set to 1, the LSM's hook is called because I write the original code back over the asm jump and call that function, but I run into an occasional kernel OOPS with an "invalid opcode": invalid opcode: 0000 [#1] SMP RIP: 0010:[<ffffffff8117b006>] [<ffffffff8117b006>] security_bprm_check+0x6/0x310 I don't know what the issue is. I've tried several different types of locking methods (see the inside of start/stop_my_code for details) to no avail. To trigger the kernel OOPS, write a simple bash while loop that endlessly starts a backgrounded "ls" command. After a minute or so, it'll happen. I'm testing this on a RHEL6 kernel, also works on Ubuntu 10.04 LTS (2.6.32 x86_64). While this method has been the most successful so far, I have tried another method of simply copying the kernel function to a pointer I created with kmalloc but when I try to execute it, I get: kernel tried to execute NX-protected page - exploit attempt? (uid: 0). If anyone can tell me how to kmalloc space and have it marked as executable, that would also help me solve the above problem. Any help is appreciated!

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• A python code to convert a number from any base to the base of 10 giving errors . What is wrong with this code?

  - by mekasperasky

  import math def baseencode(number, base): ##Converting a number of any base to base10 if number == 0: return '0' for i in range(0,len(number)): if number[i]!= [A-Z]: num = num + number[i]*pow(i,base) else : num = num + (9 + ord(number[i])) *pow(i,base) return num a = baseencode('20',5) print a Errors I get are Traceback (most recent call last): File "doubtrob.py", line 19, in <module> a = baseencode('20',5) File "doubtrob.py", line 13, in baseencode if number[i]!= [A-Z]: NameError: global name 'A' is not defined

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• SimpleMembership updating the "isconfirmed" flag

  - by Vijay V

  My Users table (the one that I created) has the following columns: UserId,UserName,FirstName,LastName,DOB After I ran this command WebSecurity.InitializeDatabaseConnection("DefaultConnection", "Users", "UserId", "UserName", autoCreateTables: true); it created the required simple membership tables for me. How would I go about "UnConfirming" an user or setting the "IsConfirmed" flag to false in the webpages_Membership using the new SimpleMembership API? (Earlier, before going to simplemembership using the "Membership" class I could update an user using the api call : Membership.UpdateUser( user );)

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• MXML Component Life Cycle

  - by Shruti

  Hi, I am new to flex. I am confused with how component life cycle goes when component build in MXML. and if MXML calls methods automatically then how to call any method in life cycle explicitly. Could anybody please explain me Thanks Shruti

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• What is the difference between using IDisposable vs a destructor in C#?

  - by j0rd4n

  When would I implement IDispose on a class as opposed to a destructor? I read this article, but I'm still missing the point. My assumption is that if I implement IDispose on an object, I can explicitly 'destruct' it as opposed to waiting for the garbage collector to do it. Is this correct? Does that mean I should always explicitly call Dispose on an object? What are some common examples of this?

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• how to define a structural type that refers to itself?

  - by IttayD

  I want to create a method sum that I can call on different types, specifically sum(1,2). def sum[A](a1: A, a2: A) = a1 + a2 This fails because the compiler can't tell if A has a method '+' I tried to define a structural type: type Addable = {def +(a: Addable)} This fails because of an illegal cyclic reference How can I achieve this in a type safe way without requiring A to extend a specific trait?

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• I need to unset the state of the jQuery .toggle(odd,even)

  - by Forkrul Assail

  Hi I have items in a table cell that gets toggled on and off. An external button accepts a click and submits the selected cell values via ajax. The problem is that I want to reset the toggle state for the selected cells. I can easily unset the highlighting, but then need a double click to trigger the correct toggle. Can the .toggle(odd, even) be reset or cycled via an external call? Thanks

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• How to make the class constructor private in Ruby?

  - by Leonid Shevtsov

  class A private def initialize puts "wtf?" end end A.new #still works and calls initialize and class A private def self.new super.new end end doesn't work altogether So what's the correct way? I want to make new private and call it via a factory method.

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• Eclipse script for commit on close?

  - by Peter Nguyen

  Hi, I was wondering how to create a Eclipse script (Eclipsemonkey) to commit the current project on closing of Eclipse? You can listen to commands such as "org.eclipse.ui.file.save" (on file save) etc. but what's the command for editor closing? And how can you call a commit action?

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• Periodically check command line output in C#

  - by iulianchira

  In my C# program I call an external program from command line using a process and redirecting the standard input. After I issue the command to the external program, every 3 seconds I have to issue another command to check the status - the program will respond with InProgress or Finished. I would like some help in doing this as efficient as possible.

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• json webservice security

  - by crisgomez

  I have a problem regarding json web service security. I tried to developed a sample web application using json webservice,but the problem is the url was exposed on the client side.So from there,anybody can make a program and call the service for a thousand times. Please take note, that the web service will be using for a registration page, in which checks if the user was exist on the database.So there is no authentication happened on this process. What are the approach to secure the calling of the exposed web service?

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