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  • How do virtual destructors work?

    - by Jack
    I am using gcc. I am aware how the virtual destructors solve the problem when we destroy a derived class object pointed by a base class pointer. I want to know how do they work? class A { public: A(){cout<<"A constructor"<<endl;} ~A(){cout<<"A destructor"<<endl;} }; class B:public A { public: B(){cout<<"B constructor"<<endl;} ~B(){cout<<"B destructor"<<endl;} }; int main() { A * a = new B(); delete a; getch(); return 0; } When I change A's destructor to a virtual function, the problem is solved. What is the inner working for this. Why do I make A's destructor virtual.

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  • How do i change everything behind a certain point in a Jagged array?

    - by Jack Null
    Say I have a jagged array, and position 2,3 is taken by int 3. Every other spot is filled with int 0. How would I fill all the positions behind 2,3 with a 4? 0 0 0 0 0 0 0 0 0 0 0 0 0 3 0 0 0 0 0 0 0 to this: 4 4 4 4 4 4 4 4 4 4 4 4 4 3 0 0 0 0 0 0 0 Ive tried variations of this: int a = 2; int b = 3; for (int x = 0; x < a; x++) { for (int y = 0; y < board.space[b].Length; y++) { board.space[x][y] = 4; } }

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  • How to get the set events of a control?

    - by Jack
    It's possible via C# code get an list of methods/delegates that was set to Control? let me explain better.. For example. Assuming some definitions like this: foo.Click += (a, b) => { ... } //.. foo.Click += (A,B) => { ... } And a megic method: var baa = foo.GetEvents("Click"); Returns baa[0] points to (a, b) => { ... } baa[1] points to (A,B) => { ... } My scenery: I make and add dynamically event to some controls inside a loop. I want depending to a boolean value a event of control of index one,will removed by using control.Click -= baa[1] or something like this. I hope this is clear for your. Thanks in advance.

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  • why winform using external dll(VC) and ocx(VC) control can only import one?

    - by jack
    we have a .net framework application with a vc dll and a vc ocx, and now if we only import one dll ,it is ok, but when we import both, it will pop a messagebox saying: Debug Assertion Failed! and i studied the child module of our application that import the vc dll, i found after the framework import vc ocx and initialize , then the function LoadLibrary in our module importing the vc dll would return 0, that means memory limited or call improperly, i use getlasterror() the error code is 1114. so it is very frustrated ,hope someone can help me.

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  • PHP: Need help with simple XML.

    - by Jack
    I am beginner in PHP. I am trying to parse this xml file. <relationship> <target> <following type="boolean">true</following> <followed_by type="boolean">true</followed_by> <screen_name>xxxx</screen_name> <id type="integer">xxxx</id> </target> </relationship> I need to get the value of the field 'following type="boolean" ' and here's my code - $xml = simplexml_load_string($response); foreach($xml->children() as $child) { if ($child->getName() == 'target') { foreach($child->children() as $child_1) if ( $child_1->getName() == 'following') { $is_my_friend = (bool)$child_1; break; } break; } } but I am not getting the correct output. I think the ' type="boolean" ' part of the field is creating problems. I know this might be a very trivial problem. Kindly bear with my ignorance. Please help.

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  • C# Why does calling an interface member from a class generate an error?

    - by Jack
    So I have an interface: interface IFoo { int Bar(); int this[int i] {get; set;} } And a class that derives from it class Foo : IFoo { public int IFoo.Bar() { //Implementation { public int IFoo.this[int i] { //Implementation } } Now, I try to do this: var fooey = new Foo(); int i = Fooey.Bar(); or this: int i = Fooey[4]; I would expect these to work properly. However, the compiler generates an error as if such members don't exist. Why is that? I am aware I can cast Foo as IFoo, but I am also aware that casting is costly to performance, which is often the reason to use interfaces in the first place. EDIT 1: These are the errors generated 'Foo' does not contain a definition for 'Bar' and no extension method 'Bar' accepting a first argument of type 'Foo' could be found (are you missing a using directive or an assembly reference?) "Cannot apply indexing to an expression of type 'Foo'"

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  • safely reading directory contents

    - by Jack
    Is it safe to read directory entries via readdir() or scandir() while files are being created/deleted in this directory? Should I prefer one over the other? When I say "safe" I mean entries returned by these functions are valid and can be operated without crushing the program. Thanks.

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  • jQuery.remove() - Is there a way to get the object back after you remove it?

    - by Jack Marchetti
    I basically have the same problem in this questions: Flash Video still playing in hidden div I've used the .remove jquery call and this works. However, I have previous/next buttons when a user scrolls through hidden/non-hidden divs. What I need to know is, once I remove the flash object, is there a way to get it back other than refreshing the page? Basically, can this be handled client side or am I going to need to implement some server side handling. detach() won't work because the flash video continues to play. I can't just hide it because the video continues to play as well.

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  • Is UTF-8 enough for all common languages?

    - by jack
    I just wanted to develop a translation app in a Django projects which enables registered users with certain permissions to translate every single message it appears in latest version. My question is, what character set should I use for database tables in this translation app? Looks like some european language characters cannot be stored in UTF-8?

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  • Need help with a SQL Query

    - by Jack
    I have created a table with the following structure- $sql = "CREATE TABLE followers ( uid int UNSIGNED NOT NULL UNIQUE, PRIMARY KEY(uid), follower_count int UNSIGNED , is_my_friend bool, status_count int UNSIGNED, location varchar(50) )"; I need to find the uid of the person with max(status_count+follower_count) and whose is_my_friend = 1 I wrote the following query but I ain't getting the correct uid. SELECT p.uid FROM (select uid,is_my_friend,max(follower_count+status_count) from followers) p WHERE p.is_my_friend = 1;

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  • Rails date format in form field

    - by Jack
    Hello I'd like my dates in the mm/dd/year format in text fields. However, they currently displays as 2010-03-26. Is there a global setting I can set to change this? I tried the following, which seems to update the .to_s method, but form fields stay the same. ActiveSupport::CoreExtensions::Date::Conversions::DATE_FORMATS.merge!(:default => '%m/%d/%Y') Thanks

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  • How to give friend access to git repository without giving command line access?

    - by Jack Humphries
    I have some git repositories running on my server and I would like to give a friend read/write access to one. That's simple: I add him as a user, give him SSH access, and change the permissions to the repository folder. Everything works fine; I'm able to clone the git repository using Xcode and change things (ssh://www.example.com/repo.git). However, I do not want him to have command line access. If I recall correctly, Github does not give command line access to those who SSH in. I'm using Snow Leopard Server. Is this more of a server issue or a git issue? Do you have any idea where to begin? Setting the user's Login Shell to none (as opposed to /bin/bash) cuts off access to everything.

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  • [JAVA]Int to String COmmand

    - by Jack.
    I'm trying to make a piece of code that will yell out anything I input. So the command is 'yell' I want to be able to type 'yell (whatever i want here)' and it will yell it out. I've been able to do it with numbers but I can't do it with a String. So how can I go about that? int x = Integer.valueOf(cmd[1]); n.setNextForceTalk(new ForceTalk("Number: " + x)); That piece of code allows me to type 'yell (number)' and it will come out with whatever number I type. But how can I do it with text.

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  • How to control number of leading spaces in a GtkWidget?

    - by Jack
    How do I set the leading spaces in a GtkWidget? as you can see into below imagem, username/password widgets are a bit away from horizontal line when the window begins My code: GtkWidget *window; GtkWidget *login_label; GtkWidget *username_label, *password_label; GtkWidget *username_entry, *password_entry; GtkWidget *ok_button; GtkWidget *hbox0, *hbox1, *hbox2, *hbox3; GtkWidget *vbox; gtk_init(&argc, &argv); window = gtk_window_new(GTK_WINDOW_TOPLEVEL); gtk_window_set_title(GTK_WINDOW(window), "hello"); gtk_window_set_position(GTK_WINDOW(window), GTK_WIN_POS_CENTER); gtk_window_set_default_size(GTK_WINDOW(window), 200, 300); g_signal_connect(G_OBJECT(window), "destroy", G_CALLBACK(gtk_main_quit), NULL); login_label = gtk_label_new("Login"); username_label = gtk_label_new("Username: "); password_label = gtk_label_new("Password: "); username_entry = gtk_entry_new(); password_entry = gtk_entry_new(); gtk_entry_set_visibility(GTK_ENTRY(password_entry), FALSE); ok_button = gtk_button_new_with_label("Enter"); g_signal_connect(G_OBJECT(ok_button), "clicked", G_CALLBACK(print_username), ok_button); hbox0 = gtk_hbox_new(TRUE, 5); hbox1 = gtk_hbox_new(TRUE, 5); hbox2 = gtk_hbox_new(TRUE, 5); hbox3 = gtk_hbox_new(TRUE, 5); vbox = gtk_vbox_new(FALSE, 10); gtk_box_pack_start(GTK_BOX(hbox0), login_label, TRUE, FALSE, 5); gtk_box_pack_start(GTK_BOX(hbox1), username_label, TRUE, FALSE, 5); gtk_box_pack_start(GTK_BOX(hbox1), username_entry, TRUE, FALSE, 5); gtk_box_pack_start(GTK_BOX(hbox2), password_label, TRUE, FALSE, 5); gtk_box_pack_start(GTK_BOX(hbox2), password_entry, TRUE, FALSE, 5); gtk_box_pack_start(GTK_BOX(hbox3), ok_button, FALSE, FALSE, 5); gtk_box_pack_start(GTK_BOX(vbox), hbox0, FALSE, FALSE, 5); gtk_box_pack_start(GTK_BOX(vbox), hbox1, FALSE, FALSE, 5); gtk_box_pack_start(GTK_BOX(vbox), hbox2, FALSE, FALSE, 5); gtk_box_pack_start(GTK_BOX(vbox), hbox3, FALSE, FALSE, 5); gtk_container_add(GTK_CONTAINER(window), vbox); gtk_widget_show_all(window); gtk_main();

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  • No sound from external subwoofer "Sonic Master" on an Asus N76VM

    - by Willem
    A few weeks ago I bought a Asus n76vm notebook looking forward to it's 'superior sound'. This sound system compromises a external subwoofer which amplifies bass and is connected to a special output jack. Ubuntu 12.04, however, does not detect this subwoofer. How could this be solved? Any help would be gratefully appreciated http://www.asus.com/Notebooks/Multimedia_Entertainment/N76VM/#specifications

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  • HTC to launch Windows 7 phone in India

    - by samsudeen
    It is a good news for the Indian smart phone users as the wait is finally over for Windows 7 mobile.The Taiwanese  mobile giant HTC is all set to release its Windows 7 based Smartphone series in India from January. HTC HD7 & HTC Mozart , the two smart phones running on Windows 7 OS started appearing on the HTC Indian website (HTC India) from last week.Though Flip kart (Indian online e-commerce website)  has started getting pre -orders for HTC HD7 a month ago , the buzz has started from last week after the introduction of “HTC Mozart”. The complete feature comparison between both the smart phones is given below. Feature Comparison HTC Mozart HTC HD 7 Microsoft Windows 7 Microsoft Windows 7 Qualcomm Snapdragon Processor QSD 8250 1 GHz CPU Qualcomm Snapdragon Processor QSD 8250 1 GHz CPU 8MegaPixel camera with Xenon Flash 5 MP, 2592?1944 pixels, autofocus, dual-LED flash, 480 x 800 pixels, 3.7 inches 480 x 800 pixels, 4.3 inches 11.9mm thick and Weighs 130g 11.2 mm thick and Weighs 162 g Bluetooth 2.1 Bluetooth 2.1 8 GB of internal storage memory 8 GB of internal storage memory 512MB of ROM and 576 of RAM 512MB of ROM and 576 of RAM 3G HSDPA 7.2 Mbps and HSUPA 2 Mbps 3G HSDPA 7.2 Mbps; HSUPA 2 Mbps Wi-Fi 802.11 b/g/n Wi-Fi 802.11 b/g/n Micro-USB interconnector Micro-USB interconnector 3.5mm audio jack 3.5mm audio jack GPS antenna GPS antenna Standard battery Li-Po 1300 MA Standard battery, Li-Ion 1230 MA Standby 360 h (2G) up to 435 h (3G) Up to 310 h (2G) / Up to 320 h (3G) Talk time Up to 6 h 40 min (2G) and 5 h 30 min (3G) Up to 6 h 20 min (2G) / Up to 5 h 20 min (3G) Estimated Price “HTC HD 7″ is priced between  INR 27855 to 32000. though the price of “HDT Mozart” is officially not announced it is estimated to be around INR 30000. Where to Buy The Windows 7 phone is not yet available in stores directly, but most of the leading mobile stores are getting pre -orders. I have given some of the online store links below. Flip kart UniverCell This article titled,HTC to launch Windows 7 phone in India, was originally published at Tech Dreams. Grab our rss feed or fan us on Facebook to get updates from us.

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  • Sesame update du jour: SL 4, OOB, Azure, and proxy support

    - by Fabrice Marguerie
    I've just published a new version of Sesame Data Browser. Here's what's new this time: Upgraded to Silverlight 4 Can run out-of-browser (OOB), with elevated permissions. This gives you an icon on your desktop and enables new scenarios. Note: The application is unsigned for the moment. Support for Windows Azure authentication Support for SQL Azure authentication If you are behind a proxy that requires authentication, just give Sesame a new try after clicking on "If you are behind a proxy that requires authentication, please click here" An icon and a button for closing connections are now displayed on connection tabsSome less visible improvements Here is the connection view with anonymous access: If you want to access Windows Azure tables as OData, all you have to do is use your table storage endpoint as the URL, and provide your access key: A Windows Azure table storage address looks like this: http://<your account>.table.core.windows.net/ If you want to browse your SQL Azure databases with Sesame, you have to enable OData support for them at https://www.sqlazurelabs.com/ConfigOData.aspx. I won't show how it works because it's already been done in several places over the Web. Here are pointers: OData.org: Got SQL Azure? Then you've got OData OakLeaf Systems: Enabling and Using the OData Protocol with SQL Azure Patrick Verbruggen: Creating an OData feed for your Azure databases Shawn Wildermuth: SQL Azure's OData Support Jack Greenfield: How to Use OData for SQL Azure with AppFabric Access Control You can choose to enable anonymous access or not. When you don't enable anonymous access, you have to provide an Issuer name and a Secret key, and optionally an Security Token Service (STS) endpoint: Excerpt from Jack Greenfield's blog: To enable OData access to the currently selected database, check the box labeled "Enable OData". When OData access is enabled, database user mapping information is displayed at the bottom of the form.Use the drop down list labeled "Anonymous Access User" to select an anonymous access user. If an anonymous access user is selected, then all queries against the database presented without credentials will execute by impersonating that user. You can access the database as the anonymous user by clicking on the link provided at the bottom of the page. If no anonymous access user is selected, then the OData Service will not allow anonymous access to the database.Click the link labeled "Add User" to add a user for authenticated access. In the pop up panel, select the user from the drop down list. Leave the issuer name empty for simple authentication, or provide the name of a trusted Security Token Service (STS) for federated authentication. For example, to federate with another ACS based STS, provide the base URI for the STS endpoint displayed by the Windows Azure AppFabric Portal for the STS.Click the "OK" button to complete the configuration process and dismiss the pop up panel. When one or more authenticated access users are added, the OData Service will impersonate them when appropriate credentials are presented. You can designate as many authenticated access users as you like. The OData Service will decide which one to impersonate for each query by inspecting the credentials presented with the query.Next time I'll give an overview of how Sesame Data Browser is built.In the meantime, happy data browsing!

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  • Apply LADSPA filter to only one channel of multichannel output with Alsa and PulseAudio

    - by justinzane
    I want to apply a filter, specifically SWH's glame-bandpass-iir, to only one of several output channels. I want unfiltered output to go to the front, rear and LFE channels with bandpass filtered output for the center channel. I'm assuming that this needs to be done with Alsa's /etc/asound.conf but I cannot understand the documentation well enough to figure out how. If there is a better way, via PulseAudio, Jack or whatever, I'm open to whatever works. Thanks.

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  • [Livre]:Chaînes d'exploits: Scénarios de hacking avancé et prévention, de A.Whitaker, K.Evans, J.Vot

    Bonjour La rédaction de DVP a lu pour vous l'ouvrage suivant: Chaînes d'exploits: Scénarios de hacking avancé et prévention de Andrew Whitaker, Keatron Evans, Jack Voth paru aux Editions PEARSON [IMG]http://images-eu.amazon.com/images/P/274402371X.08.LZZZZZZZ.jpg[/IMG] Citation: Un pirate informatique s'appuie rarement sur une unique attaque, mais utilise plutôt des chaînes d'exploits, qui impliquent plusie...

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