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• how to display the listbox items to a label using VB2008

  - by Cecilia

  I am trying to display listbox items in a label. After debugging,I get the error : " make sure that the maximun index on the list is less than the list size" any comment will be highly appreciate, Private Sub xMultiButton_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) _ Handles xMultiButton.Click Dim count As Integer count = Me.xNamesListBox.Items.Count For count = 0 To 3 Me.xResultLabel.Text = Me.xNamesListBox.SelectedItems.Item(0).ToString & ControlChars.NewLine _ & Me.xNamesListBox.SelectedItems.Item(1).ToString & ControlChars.NewLine _ & Me.xNamesListBox.SelectedItems.Item(2).ToString & ControlChars.NewLine _ & Me.xNamesListBox.SelectedItems.Item(3).ToString & ControlChars.NewLine _ & Me.xNamesListBox.SelectedItems.Item(4).ToString Next End Sub

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• On Mac OS X, do you use the shipped python or your own?

  - by The MYYN

  On Tiger, I used a custom python installation to evaluate newer versions and I did not have any problems with that*. Now Snow Leopard is a little more up-to-date and by default ships with $ ls /System/Library/Frameworks/Python.framework/Versions/ 2.3 2.5 2.6 @Current What could be considered best practice? Using the python shipped with Mac OS X or a custom compiled version in, say $HOME. Are there any advantages/disadvantages using the one option over the other? My setup was fairly simple so far and looked like this: Custom compiled Python in $HOME and a $PATH that would look into $HOME/bin first, and subsequently would use my private Python version. Also $PYTHONPATH pointed to this local installation. This way, I did not need to sudo–install packages - virtualenv took care of the rest.

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• WPF List of ViewModels bound to list of Model objects.

  - by Eric

  In the model, I have: public ObservableCollection<Item> Items { get; private set; } In the ViewModel, I have a corresponding list of ItemViewModels: public ObservableCollection<ItemViewModel> ItemViewModels ... In the XAML, I will bind (in this case a TreeView) to the ItemViewModels property. My question is, what goes in the "..." in the ViewModel shown above? I am hoping for a line or two of code to binds these two ObservableCollections (providing the type of the ViewModel to construct for each model object). However, what I'm fearing is necessary is a bunch of code to handle the Items.CollectionChanged event and manually updates the ItemViewModels list by constructing ViewModels as necessary. Thanks! Eric

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• [C#] How to create a constructor of a class that return a collection of instances of that class?

  - by codemonkie

  My program has the following class definition: public sealed class Subscriber { private subscription; public Subscriber(int id) { using (DataContext dc = new DataContext()) { this.subscription = dc._GetSubscription(id).SingleOrDefault(); } } } ,where _GetSubscription() is a sproc which returns a value of type ISingleResult<_GetSubscriptionResult> Say, I have a list of type List<int> full of 1000 ids and I want to create a collection of subscribers of type List<Subscriber>. How can I do that without calling the constructor in a loop for 1000 times? Since I am trying to avoid switching the DataContext on/off so frequently that may stress the database. TIA.

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• Hashmap method not accepting defined parameters

  - by Ocasta Eshu

  My assignment is to implement a contact list in a HashMap. All has gone well except for the problem in the code below. the HashMap method put(K key, V value) isnt accepting the defined parameters String, List. public ContactList(){ private HashMap<String, List<String>> map; public void update(String name, List<String> number){ this.map.put(name, number) The error is: The method put(String, List<String>) is undefined for the type ContactList How do I correct this?

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• why is link generated in YUI javascript failing to render in rails?

  - by pmneve

  Using YAHOO.widget.treeview to generate a table with three levels of data: module, submodule, and detail. If there is an image associated with a detail row the javascript generates a link: "<td><a href=\"/screenshot/show/" + rowData.id + "\">Screenshot</a></td>" that is appended to the html for the row. The url is generated correctly and the link appears. When clicked nothing happens except the word 'Done' appears in the browser status bar. Am calling the very same url from another page that does not use javascript and the screenshot page appears as expected. Here is the controller. class ScreenshotController < ApplicationController def show if @detail.screen_path.length 1 @imagePath = "#{RAILS_ROOT}" + "/private/#{Company.find(@detail.company_id).subdir}/" + "#{Project.find(@detail.project_id).subdir}/screenshot/" + "#{@detail.screen_path}" send_file ( @imagePath, :type = 'image/jpeg', :disposition = 'inline') end end end A sample url: http://localhost:3004/screenshot/show/20854 This code from show.html.erb belonging to the detail model works: <%= link_to 'View', :controller = 'screenshot', :id = @detail.id, :action = 'show' % Any ideas???

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• How are managed the sequences by JPA and Hibernate?

  - by romaintaz

  Hi all, I am using Hibernate in my project, and many of my entities use a sequence for their technical keys. For example: @Entity @Table(name = "T_MYENTITY") @SequenceGenerator(name = "S_MYENTITY", sequenceName = "S_MYENTITY") public class MyEntity { @Id @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "S_MYENTITY") @Column(name = "MY_ENTITY_ID") private Long entityId; ... } I have two questions about the ID generated by Hibernate when a new object of this class is persisted: Why SequenceGenerator (from javax.persistence) has a default value of allocationSize set to 50 instead of 1? What are the interests of that? What is the default algorithm used by Hibernate to calculate the generated ID? It seems that Hibernate uses the value returned by the sequence hosted by my Oracle database, but then modify it before assigning it to my entity...

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• C#: Convert array to use in params with additional parameters

  - by user1805759

  I have a method that takes params. Inside the method another variable shall be added to the output: private void ParamsTest(params object[] objs) { var foo = "hello"; // Invalid: Interpretes objs as single array parameter: Console.WriteLine("{0}, {1}, {2}", foo, objs); } When I call ParamsTest("Hi", "Ho"); I would like to see the output. hello Hi Ho What do I need to do? I can copy foo and objs into a new array and pass that array to WriteLine but is there a more elegant way to force objs to behave as params again? Kind of objs.ToParams()?

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• Custom sort logic in OrderBy using LINQ

  - by Bala R

  What would be the right way to sort a list of strings where I want items starting with an underscore '_', to be at the bottom of the list, otherwise everything is alphabetical. Right now I'm doing something like this, autoList.OrderBy(a => a.StartsWith("_") ? "ZZZZZZ"+a : a ) EDIT: I ended up using something like this; optimization suggestions welcome! private class AutoCompleteComparer : IComparer<String> { public int Compare(string x, string y) { if (x.StartsWith("_") && y.StartsWith("_") || (!x.StartsWith("_") && !y.StartsWith("_"))) { return x.CompareTo(y); } else if (x.StartsWith("_")) { return 1; } else if (y.StartsWith("_")) { return -1; } return 0; } }

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• What is the purpose of this delegate usage?

  - by Kev

  Whilst poking around some code in .NET Reflector in an app I don't have the source code for I found this: if (DeleteDisks) { using (List<XenRef<VDI>>.Enumerator enumerator3 = list.GetEnumerator()) { MethodInvoker invoker2 = null; XenRef<VDI> vdiRef; while (enumerator3.MoveNext()) { vdiRef = enumerator3.Current; if (invoker2 == null) { // // Why do this? // invoker2 = delegate { VDI.destroy(session, vdiRef.opaque_ref); }; } bestEffort(ref caught, invoker2); } } } if (caught != null) { throw caught; } private static void bestEffort(ref Exception caught, MethodInvoker func) { try { func(); } catch (Exception exception) { log.Error(exception, exception); if (caught == null) { caught = exception; } } } Why not call VDI.destroy() directly. Is this just a way of wrapping the same pattern of try { do something } catch { log error } if it's used a lot?

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• Search for nodes by name in XmlDocument

  - by RajenK

  I'm trying to find a node by name in an XmlDocument with the following code: private XmlNode FindNode(XmlNodeList list, string nodeName) { if (list.Count > 0) { foreach (XmlNode node in list) { if (node.Name.Equals(nodeName)) return node; if (node.HasChildNodes) FindNode(node.ChildNodes, nodeName); } } return null; } I call the function with: FindNode(xmlDocument.ChildNodes, "somestring"); For some reason it always returns null and I'm not really sure why. Can someone help me out with this?

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• Is It Safe to Cast Away volatile?

  - by Yan Cheng CHEOK

  Most of the time, I am doing this way. class a { public: ~ a() { i = 100; // OK delete (int *)j; // Compiler happy. But, is it safe? // Error : delete j; } private: volatile int i; volatile int *j; }; int main() { a aa; } However, I saw an article here: https://www.securecoding.cert.org/confluence/display/seccode/EXP32-C.+Do+not+access+a+volatile+object+through+a+non-volatile+reference Casting away volatile allows access to an object through a non-volatile reference. This can result in undefined and perhaps unintended program behavior. So, what will be the workaround for my above code example?

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• Co-opt popular abandonware opensource project?

  - by Mike Bouck

  Here's the scenario: A popular open source project is used/loved by many but has become stale due to the fact that the last drop came out nearly a year ago. Many bugs/feature requests/fixes have been logged in the interim and everyone is getting by via downloading the trunk and building custom/private builds with the changes incorporated. The copyright is simple -- there is none and the code is in the public domain. The project owner spins the project as community open source and has set up a sourceforge site, but to date (5 years running now) has yet to accept one contributor. In other words the "community" is a community of one. The project owner takes great pride in the project and has obviously contributed a lot of time/effort but for whatever reason has has seemingly abandoned the project and is unresponsive when offers of help are made. So, the question, should the community fork the codebase, set up a new community site, and take matters in their own hands?

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• Why this works (Templates, SFINAE). C++

  - by atch

  Hi guys, reffering to yesterday's post, this woke me up this morning. Why this actually works? As long as the fnc test is concerned this fnc has no body so how can perform anything? Why and how this works? I'm REALLY interested to see your answers. template<typename T> class IsClassT { private: typedef char One; typedef struct { char a[2]; } Two; template<typename C> static One test(int C::*); //NO BODY HERE template<typename C> static Two test(…); //NOR HERE public: enum { Yes = sizeof(IsClassT<T>::test<T>(0)) == 1 }; enum { No = !Yes }; }; Thanks in advance with help to understand this very interesting fenomena.

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• Unwanted automated creation of new instances of an activity class

  - by Marko

  I have an activity (called Sender) with the most basic UI, only a button that sends a message when clicked. In the onClickListener I only call this method: private void sendSMS(String msg) { PendingIntent pi = PendingIntent.getActivity(this, 0, new Intent(this, Sender.class), 0); PendingIntent pi = PendingIntent.getActivity(this, 0, myIntent, 0); SmsManager sms = SmsManager.getDefault(); sms.sendTextMessage("1477", null, msg, pi, null); } This works ok, the message is sent but every time a message is sent a new instance of Sender is started on top of the other. If I call sendSMS method three times, three new instances are started. I'm quite new to android so I need some help with this, I only want the same Sender to be on all the time

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• I am using vb 2008 . I am trying to create text boxes dynammically and remove them here isthe code i

  - by fari

  Private Sub setTextBox() Dim num As Integer Dim pos As Integer num = Len(word) temp = String.Copy(word) Dim intcount As Integer remove() GuessBox.Visible = True letters.Visible = True pos = 0 'To create the dynamic text box and add the controls For intcount = 0 To num - 1 Txtdynamic = New TextBox Txtdynamic.Width = 20 Txtdynamic.Visible = True Txtdynamic.MaxLength = 1 Txtdynamic.Location = New Point(pos + 5, 0) pos = pos + 30 'set the font size Txtdynamic.Font = New System.Drawing.Font("Verdana", 8.25!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte)) Txtdynamic.Name = "txtdynamic_" & intcount & "_mycntrl" Txtdynamic.Enabled = False Txtdynamic.Text = "" Panel1.Controls.Add(Txtdynamic) Next Panel1.Visible = True Controls.Add(Panel1) Controls.Add(GuessBox) Controls.Add(letters) letter = "" letters.Text = "" hang_lable.Text = "" tries = 0 End Sub`enter code here` Function remove() For Each ctrl In Panel1.Controls Panel1.Controls.Remove(ctrl) Next End Function I am able to create the textboxes but only a few of them are removed. by using For Each ctrl In Panel1.Controls it doesn't retrieve all the controls and some ae duplicated as well. Can anyone pls help me. Thanks

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• Call a C++ constructor from an Objective C class

  - by syvex

  How can I call a C++ constructor from inside an Objective C class? class CppClass { public: CppClass(int arg1, const std::string& arg2): _arg1(arg1), _arg2(arg2) { } // ... private: int _arg1; std::string _arg2; }; @interface ObjC: NSObject { CppClass _cppClass; } @end @implementation ObjC - (id)init { self = [super init]; if ( self ) { // what is the syntax to call CppClass::CppClass(5, "hello") on _cppClass? } return self; } @end

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• Visual Studio 2010 debug minidump

  - by Snake

  Hi all, Consider the following code (written with Visual Studio 2010 and .NET 4.0) using System; namespace DumpTester { class Program { static void Main(string[] args) { int test = new Random().Next(); Console.WriteLine(test + new Random().Next()); Test(); } private static void Test() { throw new Exception(); } } } When running outside of Visual Studio you get this nice window of Microsoft Windows 7 that it is looking for a solution. Obviously, since this is my app, there is none. At that point I create a full dump file of my application with for example Process Explorer. I then open that dmp file from its location and try to debug. But whatever I try, it can't find the location of the source symbols. I tried putting the pdb next to the dump but it just doesn't find it. What am I doing wrong?

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• Java-Recursion: When does statements after a recursive method call executes

  - by Ruru Morlano

  When are statements after the method call itself going to execute? private void inorderHelper(TreeNode node) { if ( node==null ) return; inorderHelper(node.leftNode); System.out.printf("%d", node.data); inorderHelper(node.rigthNode); } All I can see is that the line of codes inorderHelper(node.leftNode) will continue to iterate until node == null and the method terminates immediately before node.data is printed. I think that I didn't get well recursion but all examples I can find doesn't have statements after the recursive call. All I want to know is when are statements like System.out.printf("%d",node.data) going to execute before the method return?

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• How to name variables which are structs

  - by evilpie

  Hello, i often work on private projects using the WinApi, and as you might know, it has thousands of named and typedefed structs like MEMORY_BASIC_INFORMATION. I will stick to this one in my question, what still is preferred, or better when you want to name a variable of this type. Is there some kind of style guide for this case? For example if i need that variable for the VirtualQueryEx function. Some ideas: MEMORY_BASIC_INFORMATION memoryBasicInformation; MEMORY_BASIC_INFORMATION memory_basic_information; Just use the name of the struct non capitalized and with or without the underlines. MEMORY_BASIC_INFORMATION basicInformation; MEMORY_BASIC_INFORMATION information; Short form? MEMORY_BASIC_INFORMATION mbi; I often see this style, using the abbreviation of the struct name. MEMORY_BASIC_INFORMATION buffer; VirtualQueryEx defines the third parameter lpBuffer (where you pass the pointer to the struct), so using this name might be an idea, too. Cheers

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• More threads and orientation changes questions.

  - by synic

  When it comes to threads and orientation changes, it seems the normal thing to do is something like this: public class Bwent extends Activity { private static Bwent instance; @Override public void onCreate(Bundle icicle) { super.onCreate(icicle); instance = this; } //... That way, if you're making a network request with a thread, and someone changes the orientation of the phone, the thread will know to use the new Activity. However, is it possible that the thread could finish during the time Android is destroying the old Activity and creating a new one? Is there a moment in the process where the thread still might be pointing to the wrong Activity, or a partially destroyed activity? It seems like there shouldn't be, but even using a Handler created in the main thread, I'm having intermittent issues with a thread trying to update an object that no longer exists. It's rare, but it does happen.

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• Using locks inside a loop

  - by Xaqron

  // Member Variable private readonly object _syncLock = new object(); // Now inside a static method foreach (var lazyObject in plugins) { if ((string)lazyObject.Metadata["key"] = "something") { lock (_syncLock) { if (!lazyObject.IsValueCreated) lazyObject.value.DoSomething(); } return lazyObject.value; } } Here I need synchronized access per loop. There are many threads iterating this loop and based on the key they are looking for, a lazy instance is created and returned. lazyObject should not be created more that one time. Although Lazy class is for doing so and despite of the used lock, under high threading I have more than one instance created (I track this with a Interlocked.Increment on a volatile shared int and log it somewhere). The problem is I don't have access to definition of Lazy and MEF defines how the Lazy class create objects. My questions: 1) Why the lock doesn't work ? 2) Should I use an array of locks instead of one lock for performance improvement ?

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• How do I create two mutual producer/consumers with internal state in Haskell?

  - by Keith

  I've got an agent that takes in states and returns actions, while keeping an internal representation of the utility of state/action pairs. I've also got an environment that takes in actions and returns state/reward pairs. I need to be able to set the agent up with a start state and then continuously go from agent -(action)- environment -(state, reward)- agent -(action)-... However, the internal states (which need to be updated every iteration) need to stay private (that is, within the agent or the environment). This means that I can't simply call environment as a function within the agent using state and action as arguments. I'm somewhat of a Haskell noobie, so I'm not even sure if this is possible.

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• Where does memory dynamically allocated reside?

  - by Summer_More_More_Tea

  Hello everyone: We know that malloc() and new operation allocate memory from heap dynamically, but where does heap reside? Does each process have its own private heap in the namespace for dynamic allocation or the OS have a global one shared by all the processes. What's more, I read from a textbook that once memory leak occurs, the missing memory cannot be reused until next time we restart our computer. Is this thesis right? If the answer is yes, how can we explain it? Thanks for your reply. Regards.

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• How to send KeyEvents trough an input method service to a Dialog, or a Spinner menu?

  - by shutdown11

  I'm trying to implement an input method service that receives intents sent by a remote client, and in response to those sends an appropriate KeyEvent. I'm using in the input method service this method private void keyDownUp(int keyEventCode) { getCurrentInputConnection().sendKeyEvent( new KeyEvent(KeyEvent.ACTION_DOWN, keyEventCode)); getCurrentInputConnection().sendKeyEvent( new KeyEvent(KeyEvent.ACTION_UP, keyEventCode)); } to send KeyEvents as in the Simple Sofykeyboard Sample, and it works in the home, in Activities... but it doesn't works when a Dialog or the menu of a Spinner is in foreground. The events is sent to the parent activity behind the Dialog. Is there any way to send keys and control the device like using the hardware keys from an input method?

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