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• VB.NET - cannot get Video Preview to work

  - by Yiu Korochko

  Hi, Overflow. I have an application which is supposed to convert a video via DirectShowSource. I have a checkbox which enables a button called "btnviewcrop" which shows a new form called crp.vb for cropping/shearing pixels off the video. Now, I have a Panel1 that I want to set as the owner (the video drawing surface) but when I set it to open, the application crashes (Error: Object reference not set to an instance of an object.) and I do not understand how to fix it. Here is my button code: Imports Microsoft.DirectX.AudioVideoPlayback Private Sub btnviewcrop_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnviewcrop.Click Me.ShowInTaskbar = False Me.Enabled = False crp.Show() Dim cropperv As Video cropperv.Owner = crp.preview cropperv.FromFile(labinputfile.Text, True) cropperv.Play() End Sub

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• Context Menu SourceControl Error

  - by developer

  Hi All, I am trying to use contextmenu in my textbox control and I want to bind the textbox value to the value selected in context menu,below is my code <Window.CommandBindings> <CommandBinding Command="local:MyPanel.ChangeTextboxValue" Executed="ChangeTextboxValue_Executed"/> </Window.CommandBindings> CODE-BEHIND public static RoutedUICommand ChangeTextboxValue = new RoutedUICommand ("ChangeTextboxValue", "ChangeTextboxValue", typeof(MyPanel)); private void ChangeTextboxValue_Executed(object sender, ExecutedRoutedEventArgs e) { string oldvalue = Convert.ToString(e.Parameter); (((sender as MenuItem).Parent as ContextMenu).PlacementTarget as TextBox).Text = oldvalue; } oldvalue is the value I want the textbox controls value to change to. I am trying to use above code but it gives me the error, 'Object reference not set to an instance of object'. I tried to debug the app and I get ContextMenu as null.. .Any ideas why??

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• TFS 2010 build template failing to open in designer - how to fix?

  - by Duncan Bayne

  I can open the DefaultTemplate.xaml that was installed as part of our TFS 2010 RC setup. I created a copy of this template called ApplicationTemplate.xaml and modified it slightly, using the workflow designer in Visual Studio. Now, I can no longer open ApplicationTemplate.xaml. When I try, I receive many errors like the following: Error 2 Assembly 'Microsoft.TeamFoundation.Build.Client' was not found. Verify that you are not missing an assembly reference. Also, verify that your project and all referenced assemblies have been built. C:\Projects\tfs\Hydraulics\BuildProcessTemplates\ApplicationTemplate.xaml 1 1828 Miscellaneous Files However, I can still open and edit the DefaultTemplate.xaml file without any issues. Has anyone else come across this problem, & if so, did you manage to resolve it or did you have to recreate the template?

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• PHP - white screen of death!

  - by Industrial

  Hi everyone, After debugging a codeigniter app that were installed into a new development environment, I have started to freak out when seeing white screens with nothing more available. I have been able to solve each and every one of the errors that have caused this, but it have taken seriously way too long time. PHP error_reporting(E_ALL) & display_errors", 1 is set as well. I even installed Xdebug in hope of getting more output, but no. My logging settings are also working, but nothing is written to the log. Is there a way to get something informative printed out instead of a complete white screen? It would certainly shorten my time spent on solving the eventual errors that causes this? Thanks a lot! Reference: http://stackoverflow.com/questions/2149321/why-does-code-igniter-give-me-a-white-page

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• [jquery] return the inserted element

  - by Quamis

  Hello, i'm pretty new to jquery. I'm trying to insert an element to the DOM, and get that element back in my script. Ex: var elem = $("body").append(""); $(elem).show(); but it seems that .append returns the whole jQuery object.. am i supposed to use an ID for the inserted element and always reference it by it?? i really hope that there is a smarter move here. I'm used to do it like that from Prototype..

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• Security Exception while implementing global search for Messaging

  - by Sunil

  I am trying to enable global search for messaging application (i.e., messages can be searched from home screen search box). I have followed all the steps given in http://developer.android.com/reference/android/app/SearchManager.html I am getting the following exception 04-16 12:49:26.917: ERROR/DatabaseUtils(102): java.lang.SecurityException: Permission Denial: reading com.android.providers.telephony.MmsSmsProvider uri content://mms-sms/search_suggest_query/m?limit=58 from pid=106, uid=10000 requires android.permission.READ_SMS I have set permission in MmsSmsProvider.java file for read, write sms and global search, but still I get this error. Can anyone help. Regards, Sunil.

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• Adding new column in Sales Order View Items in Magento Admin

  - by fdierre

  In the admin interface of Magento I need to modify the tables in the Sales / Order / View order so that it shows, besides the products name, their manufacturer as well. I'm trying to look for the file to modify to make that happen. I thought I would find a section with all the columns that are displayed in app/code/core/Mage/Sales/Block/Order/Item/Renderer/Default.php but by inspecting it there seem to be no reference to the columns/product attributes. I also tried to modify app/design/adminhtml/default/default/template/sales/order/view/items/renderer/default.phtml by changing <?php echo $this->getColumnHtml($_item, 'name') ?> into <?php echo $this->getColumnHtml($_item, 'manufacturer') ?> but it changed nothing, so I suppose that file is not involved... Can anybody please point me to the right file to modify? Thank you!

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• Placeholder containing dynamic table is empty unless I create table twice

  - by Mike O.

  I am dynamically creating a table that contains a textbox in each cell. The table is put in a placeholder control. Everything displays perfectly. The problem is when I go to retrieve the values entered in the cells. I have the code to generate the table in a separate method called CreateTable(). In order for my program to find a table in the placeholder when I go to save, I have to run CreateTable() in a postback event AND in the PageLoad event. If I call CreateTable() in only one of those places and I try to save, it says the placeholder is empty and, therefore, I cannot save the textbox contents. I've tried calling CreateTable() from InitLoad but that doesn't work because it needs to reference values from three static controls: 1 dropdown, 1 listbox, and 1 calendar control, which I don't believe have had their viewstate rendered yet. Anyone have any ideas? It would sure be nice not to have to double the number of database calls just to make this work.

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• Which libraries use the "We Know Where You Live" optimization for std::make_shared?

  - by KnowItAllWannabe

  Over two years ago, Stephan T. Lavavej described a space-saving optimization he implemented in Microsoft's implementation of std::make_shared, and I know from speaking with him that Microsoft has nothing against other library implementations adopting this optimization. If you know for sure whether other libraries (e.g., for Gnu C++, Clang, Intel C++, plus Boost (for boost::make_shared)) have adopted this implementation, please contribute an answer. I don't have ready access to that many make_shared implementations, nor am I wild about digging into the bowels of the ones I have to see if they've implemented the WKWYL optimization, but I'm hoping that SO readers know the answers for some libraries off-hand. I know from looking at the code that as of Boost 1.52, the WKWYL optimization had not been implemented, but Boost is now up to version 1.55. Note that this optimization is different from std::make_shared's ability to avoid a dedicated heap allocation for the reference count used by std::shared_ptr. For a discussion of the difference between WKWYL and that optimication, consult this question.

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• How can I prevent ADO from creating multiple SPIDs?

  - by stusmith

  I'm working on an application that creates a single ADO connection and keeps it open for the lifetime of the application. I have connection pooling turned off. (Please ignore the fact that this might not be best practice for the purposes of this question). If I spawn a new thread and use the exact same ADO connection, it uses a new SPID behind the scenes. Is there anyway to ensure an ADO connection always uses the same SPID, across all threads? (For reference the application is VC++ using ADO via COM to SQL Server).

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• Handling JSON and HTML templates in jQuery

  - by Toby Hede

  I have an ajax-enabled site that presents a lot of dynamic content by interpolating JSON values with HTML. This all works fine. BUT it means I have significant amounts of HTML all through my JavaScript. For example: var template = "<div>Foo: {bar}</div><div>Blah: {vtha}</div>"; template.interpolate({bar:"bar",blah:"vtha"}); I have cut this down a fair bit - some of my dynamic elements have quite a lot of HTML and a lot going on. I am using jQuery and I am building on Rails, so if there is something smart in either framework, that would be great. For reference, the String interpolation function used above is: String.prototype.interpolate = function (o) { return this.replace(/{([^{}]*)}/g, function (a, b) { var r = o[b]; return typeof r === 'string' || typeof r === 'number' ? r : a; } ); };

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• Why does initWithFrame have the wrong frame value?

  - by greypoint

  I have a subclass of UIButton called INMenuCard and I am overriding the initWithFrame to include an activity indicator. The menuCard places correctly but any internal reference to "frame" give me "inf,inf,0,0" which means my activityIndicator subview is not placed correctly. What might I be missing? @implementation INMenuCard - (id)initWithFrame:(CGRect)frame { if (self = [super initWithFrame:frame]) { CGRect innerFrame = CGRectInset(frame, 50.0f, 100.0f); activityIndicator = [[UIActivityIndicatorView alloc] initWithFrame:innerFrame]; activityIndicator.activityIndicatorViewStyle = UIActivityIndicatorViewStyleWhite; [self addSubview:activityIndicator]; } return self; } I am instantiating INMenuCard with (debugging shows the CGRect values are correct): CGRect cardFrame = CGRectMake(cardX, cardStartY, cardWidth, cardHeight); INMenuCard *menuCard = [[INMenuCard buttonWithType:UIButtonTypeCustom] initWithFrame:cardFrame]; [theView addSubView:menuCard];

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• Dotfuscator from .NET 2.0

  - by vasek7

  Is there any chance to see Application Runs on Codeplex with .NET 2.0 application? I explored Dotfuscator is using web service url http://so-s.info/PreEmptive.Web.Services.Messaging/MessagingServiceV2.asmx. Is possible to track application run event manually? Something like add web service reference and call: Dotfuscator.MessageCache messages = new Dotfuscator.MessageCache(); messages.Business.CompanyId = new Guid("3E35F098-CE43-4F82-9E9D-05C8B1046A45"); messages.Application.Id = new Guid("my app guid"); messages.Application.Name = Application.ProductName; messages.Application.Version = Application.ProductVersion; Dotfuscator.MessagingServiceV2 s = new Dotfuscator.MessagingServiceV2(); s.Publish(messages);

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• Inheriting database connection in PHP OOP

  - by vrode

  My abstract class Database is made for database interaction and any child of this class (UserDatabase, ActionDatabase, EventDatabase) inherits its database connection which is defined as static. `abstract class Database { static $connection = mysql_connect( ); } class UserDatabase extends Database { ... public function __construct( ) { $connection ? "connected" : "not connected"; $this-table = "users"; mysql_query( "FROM " . $this-table . " SELECT *" ); } } ` Does that mean, that my database connection is only set up and stored in memory once and passed on to subclasses as reference without being replicated for each instance? Is this how you would implement you OOP-correct database interface?

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• Construct Numpy index given list of starting and ending positions

  - by Abiel

  I have two identically-sized numpy.array objects (both one-dimensional), one of which contains a list of starting index positions, and the other of which contains a list of ending index positions (alternatively you could say I have a list of starting positions and window lengths). In case it matters, the slices formed by the starting and ending positions are guaranteed to be non-overlapping. I am trying to figure out how to use these starting and ending positions to form an index for another array object, without having to use a loop. For example: import numpy as np start = np.array([1,7,20]) end = np.array([3,10,25]) Want to reference somearray[1,2,7,8,9,20,21,22,23,24])

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• Prototype problem with replace

  - by xain

  Hi, in my html page, I have the following: <div id="rub"> Select at least one Rub </div> In the script code, I have if ( some condition ... ) $('rub').replace("Rubs selected:"); Which works fine, but when a second event is triggered, in the code I have if ( some other condition ... ) $('rub').replace("Selected at least one item:"); That gives the error $("rub") is null It's as if the rub reference was lost after the first replace. (Also tried with Element.replace with the same result) Any clues ? Thanks in advance.

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• Simple Obj-C Memory Management Question

  - by yar

  This is from some sample code from a book // On launch, create a basic window - (void)applicationDidFinishLaunching:(UIApplication *)application { UIWindow *window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]]; UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:[[HelloController alloc] init]]; [window addSubview:nav.view]; [window makeKeyAndVisible]; } But a release is never called for window nor for nav. Release should be called since alloc was called, right? If #1 is right, then I would need to store a reference to each of these in an instance variable in order to release them in the dealloc? Perhaps I'm wrong all around...

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• Foreign Key vs. Independent Relationships - is there improvement with Entity Framework 5?

  - by zam6ak

  I have read several articles and questions on concept of foreign key vs independent relationship when using Entity Framework. And I am still not 100% sure which way to go.... I would prefer not to "pollute" my domain POCOs by having a property that will be used in FK relationship when I already have a property reference to "has a" object. My questions are (looking at you @EFTeam, @Ladislav Mrnka) are there any improvements on this subject in the upcoming Entity Framework v5? are there more advantages if I use FK instead of independent associations (particularly with code first)?

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• rails - caches_action expire_action

  - by mark

  Hi I want to expire a cached action and wondered how to generate the correct reference. #controller caches_action :index, :layout => false #generates this fragment which works fine views/0.0.0.0:3000/article/someid/posts #sweeper ... expire_action article_posts_path(:article_id => post.article) # results in this Expired fragment: views//en/article/someid/posts (0.0ms) So this is almost ok, except the host is missing. What do I do that supplies this to the expire_action method? Thanks in advance.

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• Is this query safe in SQL Server?

  - by xaw

  I have this SQL update query: UPDATE table1 SET table1.field1 = 1 WHERE table1.id NOT IN (SELECT table2.table1id FROM table2); Other portions of the application can add records to table2 which use the field table1id to reference table1. The goal here is to remove records from table1 which aren't referenced by table2. Does SQL Server automatically lock table2 with this kind of query so that a new record can't be added to table2 while executing this query? I've also considered: UPDATE table1 SET field1 = 1 WHERE 0 = (SELECT COUNT(*) FROM table2 WHERE table1.id = table2.table1id); Which seems possibly safer, but much slower (because a SELECT would be called on each row of table1 instead of just one select for the NOT IN)

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• Mapping tables from an existing database to an object -- is Hibernate suited?

  - by Bernhard V

  Hello! I've got some tables in an existing database and I want to map them to a Java object. Actually it's one table that contains the main information an some other tables that reference to such a table entry with a foreign key. I don't want to store objects in the database, I only want to read from it. The program should not be allowed to apply any changes to the underlying database. Currently I read from the database with 5 JDBC sql queries and set the results then on an object. I'm now looking for a less code intensive way. Another goal is the learning aspect. Is Hibernate suitable for this task, or is there another ORM framework that better fits my requirement?

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• When is C++ covariance the best solution?

  - by Neil Butterworth

  This question was asked here a few hours ago and made me realise that I have never actually used covariant return types in my own code. For those not sure what covariance is, it's allowing the return type of (typically) virtual functions to differ provided the types are part of the same inheritance hierarchy. For example: struct A { virtual ~A(); virtual A * f(); ... }; struct B : public A { virtual B * f(); ... }; The different return types of the two f() functions are said to be covariant. Older versions of C++ required the return types to be the same, so B would have to look like: struct B : public A { virtual A * f(); ... }; So, my question: Does anyone have a real-world example where covariant return types of virtual functions are required, or produce a superior solution to simply returning a base pointer or reference?

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• iphone: Implement delegate in class

  - by Nic Hubbard

  I am trying to call up a modal table view controller using presentModalViewController but I am not sure what to do about the delegate. The following code gives me an error: MyRidesListView *controller = [[MyRidesListView alloc] init]; controller.delegate = self; [self presentModalViewController:controller animated:YES]; [controller release]; Error: Request for member 'delegate' is something not a structure or union Now, I realized there is no delegate property in my MyRidesListView class. So, how would I add a reference to my delegate there? What am I missing here?

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• Retrieving content of a txt file from URL to Android

  - by eightx2

  I would like to be able to retrieve contents of a .txt file from the internet, and load it in an EditText. I tried using the code on this page: Reading Text File From Server on Android It didn't work, as you might have guessed. I've read on numerous sites about this type of problem, but I can't get anything to work. Someone suggested AndroidHttpClient (http://developer.android.com/reference/android/net/http/AndroidHttpClient.html), but I simply can't find any examples with this. As I'm a newbie in Android programming, I would love if someone could please give me a small example.

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• jQuery - how to pass $(this) as an object?

  - by regan

  Hello! I'm trying to pass an object into a function but think there's a problem with $(this) not actually being valid at the point of passing it in. $('textarea#quote').live('bind',function(){ }).limit('10',$(this).parents('form').children().find('span#qc') ); The second parameter can be either a string or an object like $('span#qc'), but I also want to be able to pass in an object which references the current one. Why? Because I have several forms on same page, each containing textarea#quote, so depending on which form is selected I want to be able to reference a particular element within the same form. Anyone??

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