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• SQL Server Express: Failed to add primary key after creating a database table

  - by Syd

  Scenario: I have created a database table. And when I tried to add a primary key (using the SQL Server Management Studiio) to the table, it failed with an error message "Saving changes is not permitted. The changes you have made requrie the following tables to be dropped and re-created. You have either made changes to a table that can't be recreated or enabled the option Prevent savign changes that require the table to be re-created." The environment is Windows 7. I have earlier installed it on a Windows XP SP2 and it worked. And yes, my table is empty (freshly created). My current workaround is to run the "Drop and Create" script. The other alternative is to create the primary key before I save the table. Is this a bug or a limitation with the Express version?

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• TabContainer in BorderContainer not showing correctly

  - by Stefaan

  Hi, I am using a borderContainer with a fix width and centering in the center of my page (Use of a div around the bordercontainer). Everything works fine until i add a TabContainer. All of a sudden i can not see my Tab's anymore. This goes as wel for IE as FF. Is this a bug or something else? How could i work around this? I'm using the latest release of dojo 1.4.3. I've tried using borderContainer in borderContainer with no result. Thnx Stefaan

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• Images with unknown content: Dangerous for a browser?

  - by chris_l

  Let's say I allow users to link to any images they like. The link would be checked for syntactical correctness, escaping etc., and then inserted in an <img src="..."/> tag. Are there any known security vulnerabilities, e.g. by someone linking to "evil.example.com/evil.jpg", and evil.jpg contains some code that will be executed due to a browser bug or something like that? (Let's ignore CSRF attacks - it must suffice that I will only allow URLs with typical image file suffixes.)

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• When pressing Back/Menu button my app hangs

  - by Pentium10

  I am having a really annoying bug, which yet I don't know how to trace it. I have an activity with 3 tabs, each populated by adapters build by asynctasks. They are displaying well, navigation is fine. I've extended TabActivity. But whenever I hit the Back/Menu/Search button it halts, then after a while the OS displays me this warning: Sorry Activity Contacts (in application MyApp) is not responding. Force close or Wait. How can I trace this problem on the phone?

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• Is there some way to assume @Nullable as default? (using FindBugs or any other free tool).

  - by alex2k8

  Consider such code public void m1(String text) { if(text == null) text = "<empty>"; System.out.println(text.toLowerCase()); } And this is a buggy version: public void m1(String text) { System.out.println(text.toLowerCase()); } If null value passed, the NullPointerException may be thrown. I would like the static-analysis tool (e.g. FindBugs) to report this issue. Unsuccessfully the FindBugs (at least by default) requires me to specify @Nullable annotation explicitly. public void m1(@Nullable String text) { System.out.println(text.toLowerCase()); // FindBugs: text must be nonnull but is marked as nullable } The problem is that if I forget to annotate it, the bug will be missed!!! How can I make the FindBugs (or any other free tool) to assume @Nullable by default?

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• Is it a wise decision to go from dev to third line/Tier 3 dev support?

  - by dotnetdev

  Hi, I am an experienced, mid-level developer. However, I recently spotted a job for a company which is small but has a lot of emphasis on training(beyond the basic technical training, but also mentoring, leadership training, etc). The role is 3rd line so still very technical. It's in app support so it's post implementation development rather than pure out-and-out development like I do now (or don't, as the senior devs do all of the interesting work). However, and this is the question - is this sort of career move common? Also, wouldn't a tech support role be a big shock to the system because I've never dealt with customers? I therefore think it's a bad move? Working in dev, I am used to the lack of customer contact and it is all filtered through by my manager. But in tech support, contacting customers/rude customers could be scary. I don't mind fixing other people's mistakes (better than me making mistakes!) and doing post-implementation dev for production systems (will give me a lot of discipline), and I do get bored sitting in the same place looking/talking to the same people in suits (I work in a corporate environment). The company puts A LOT of emphasis on training and prospects, which I don't get in the current (big) company I work at. Any advice on how to handle tech support is appreciated! Thanks

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• Could not laod file or assembly ‘System.Web.Silverlight’

  - by Adam Berent

  I really need some help with this as I have been trying to fix this for months and I can't figure it out. I run an online chess site written in Silverlight 3.0 The architecture is Silverlight Client connecting to a WCF service that reads and writes data to a SQL Server database. It is hosted on Godaddy, Once every so often I get the following error: Could not laod file or assembly ‘System.Web.Silverlight’ or one of its dependencies. The system cannot find the path specified. If I leave it alone it will fix itself after a few hours, however usually I just make a new publish of my application and it goes away. Also all the pages in the solution get this message not just the Silverlight application. So I have an aspx page with top ranks that does not use Silverlight but is in the same solution it also gets the same error. Its almost like the whole site dies. This does not seem like a huge issue but it makes going on vacation hard since my site can go down at any time I am away. Also this seems to happen the most when I am sleeping so I often don't get to fixing it until I have already lost hours of potential logins. If you have had the same issue please, please help!

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• When designing an event, is it a good idea to prevent listeners from being added twice?

  - by Matt

  I am creating an event-based API where a user can subscribe to an event by adding listener objects (as is common in Java or C#). When the event is raised, all subscribed listeners are invoked with the event information. I initially decided to prevent adding an event listener more than once. If a listener is added that already exists in the listener collection, it is not added again. However, after thinking about it some more, it doesn't seem that most event-based structures actually prevent this. Was my initial instinct wrong? I'm not sure which way to go here. I guess I thought that preventing addition of an existing listener would help to avoid a common programming error. Then again, it could also hide a bug that would lead to code being run multiple times when it shouldn't.

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• git - how do we verify commit messages for a push?

  - by shovas

  Coming from CVS, we have a policy that commit messages should be tagged with a bug number (simple suffix "... [9999]"). A CVS script checks this during commits and rejects the commit if the message does not conform. The git hook commit-msg does this on the developer side but we find it helpful to have automated systems check and remind us of this. During a git push, commit-msg isn't run. Is there another hook during push that could check commit messages? How do we verify commit messages during a git push?

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• Is there an autorelease pool in class methods?

  - by mystify

  I have an class method which generates an UIView, like this: + (UIImage*)imageWithFileName:(NSString*)imgFile { UIImage *img = nil; NSBundle *appBundle = [NSBundle mainBundle]; NSString *resourcePath = [appBundle pathForResource:imgFile ofType:nil]; if (resourcePath != nil) { NSURL *imageURL = [NSURL fileURLWithPath:resourcePath]; NSData *data = [[NSData alloc] initWithContentsOfURL:imageURL]; img = [UIImage imageWithData:data]; // should be autoreleased!! [data release]; } return img; } However, when I use this, the image data is NEVER freed. There is definitely a memory bug with this, although I didn't break any memory management rule I am aware of. My guess is that because this is a class method which gets called from instance methods, There is no active autorelease pool in place or it's one that only gets drained when I quit the app. Could that be right?

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• Aborted core dumped C++

  - by avd

  I have a large C++ function which uses OpenCV library and running on Windows with cygwin g++ compiler. At the end it gives Aborted(core dumped) but the function runs completely before that. I have also tried to put the print statement in the end of the function. That also gets printed. So I think there is no logical bug in code which will generate the fault. Please explain. I am also using assert statements.But the aborted error is not due to assert statement. It does not say that assertion failed. It comes at end only without any message. Also the file is a part of a large project so I cannot post the code also.

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• Deploy tracking with Ruby on Rails and Capistrano

  - by TK

  Like every commit has a reason and purpose, I think each deploy has a purpose and reason. Source code commits have a comment. But deploying doesn't have any. How do I record a reason and purpose for each deploy automatically? I need to keep a record of: Who deployed to where and what time. Why deployed? Bug fixes? Feature update? Emergency fix not on iteration plan? Which git or svn ref was used? Have anybody felt the need for this kind of system? How do you feel about my approach? How can I achieve my goal? I'm currently using Capistrano for deployment.

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• So where is this calling super?

  - by dontWatchMyProfile

  From the Core Data docs: Inheritance If you have two subclasses of NSManagedObject where the parent class implements a dynamic property and its subclass (the grandchild of NSManagedObject) overrides the methods for the property, those overrides cannot call super. @interface Parent : NSManagedObject @property(nonatomic, retain) NSString* parentString; @end @implementation Parent @dynamic parentString; @end @interface Child : Parent @end @implementation Child - (NSString *)parentString { // this throws a "selector not found" exception return parentString.foo; } @end very, very funny, because: I see nobody calling super. Or are they? Wait... parentString.foo results in ... a crash ??? it's a string. How can that thing have a .foo suffixed to it? Just another documentation bug?

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• What causes VB6 "Run-Time Error '5': Invalid Procedure Call or Argument"

  - by cundh2o

  In VB6, users occasionally receive this error and I am unable to reproduce it. Run-Time Error '5': Invalid Procedure Call or Argument I am referencing the "MSWord 10 Object Library" and sometimes this error occurs at some point after the application has opened MSWord 2002. However, this app has referenced the MSWord 10 Object Library for years, and this error just started occurring in the last few months. I am assuming I have introduced a bug somewhere, but no idea what might be causing it. The error does not occur very often and cannot be reproduced by a user when I am standing there. The error forces the app to totally shut down. Users are running Windows XP

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• Determine if a subview is visible in a UIScrollView

  - by Jools

  Hi all, I've added a view to my app, that contains a UIScrollView, with a number of UITextViews in it's content view. This works perfectly on OS 3.0 and up, but when I test it on my 2.2.1 iPod touch, there is a UITextView bug that stops any text views automatically updating their content when they are scrolled into view - so you have to send them the setNeedsDisplay message. However, I only want to do this when they start to become visible during the scroll - how do I determine, in the UIScrollView's scrollViewDidScroll delegate method, whether a UITextView is visible in the UIScrollView's frame? Ta. Jools.

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• Getting service unavailable message when sending messages to google xmpp using wokkel

  - by Code freak

  Hi, I made a wokkel (twisted python) bot to send and receive messages from the google xmpp service. Everything (auth, presence) etc works fine. One of the rquirements of our prject is that we need to send broadcast messages to everyone in the list. Normal messages and replies work fin, but when i snd a broadcast message, i get this service unavailable error 503 message. There are about 1000 user in my contact list. Is this some bug in the code or is it google policy to prevent rapid messaging. Also, how do other google bots cater to a large contact base ? does google provide a commercial solution for such applications ? Thanks

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• Trouble with QxtGlobalShortcut [solved]

  - by Ockonal

  Hello, i'm trying to set global shortcut for my applcation using QxtGlobalShortcut. Here is my code: QxtGlobalShortcut m_hotkeyHandle; m_hotkeyHandle.setShortcut( QKeySequence("Ctrl+Shift+X") ); m_hotkeyHandle.setEnabled(true); connect( &m_hotkeyHandle, SIGNAL(activated()), this, SLOT(hotkeyPressed()) ); void MainWindow::hotkeyPressed() { QMessageBox::information(this, "Good", "Hot key triggered", "yes", "no"); } But after applcation started i got: QxtGlobalShortcut failed to register: "Ctrl+Shift+X" And my programm doesn't activate after hot key pressing. What should i do? EDIT: There was a bug in Qxt-lib 0.5 with shortcut. I spoke with developer and knew that i just need to update library from dev-branch (0.5.1 is worked).

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• Regular Expression to Match All Characters after another Regex Match

  - by Anthony Wood

  I know this may sound a little confusing, so I am open to suggestions on renaming the title. Basically I have string such as C:...\Downloads\Folder\SubFolder\SubSubFolder. and I want to return the SubFolder and SubSubFolder only. So far, my Regex looks like (?=\\Downloads\\.*?\\).* which matches Downloads\Folder\SubFolder\SubSubFolder. Does anybody have any Ideas what I am missing???? All the solutions below seem to work (except if you didn't know "Folder"). Potentially a bug with the tool I was using to test the regular expressions.

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• Detecting what the target object is when NullReferenceException is thrown.

  - by StingyJack

  I'm sure we all have received the wonderfully vague "Object reference not set to instance of an Object" exception at some time or another. Identifying the object that is the problem is often a tedious task of setting breakpoints and inspecting all members in each statement. Does anyone have any tricks to easily and efficiently identify the object that causes the exception, either via programmatical means or otherwise? --edit It seems I was vague like the exception =). The point is to _not have to debug the app to find the errant object. The compiler/runtime does know that the object has been allocated, and that the object has not yet been instantiated. Is there a way to extract / identify those details in a caught exception @ W. Craig Trader Your explanation that it is a result of a design problem is probably the best answer I could get. I am fairly compulsive with defensive coding and have managed to get rid of most of these errors after fixing my habits over time. The remaining ones just tweak me to no end, and lead me to posting this question to the community. Thanks for everyone's suggestions.

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• filter queryset based on list, including None

  - by jujule

  Hi all I dont know if its a django bug or a feature but i have a strange ORM behaviour with MySQL. class Status(models.Model): name = models.CharField(max_length = 50) class Article(models.Model) status = models.ForeignKey(status, blank = True, null=True) filters = Q(status__in =[0, 1,2] ) | Q(status=None) items = Article.objects.filter(filters) this returns Article items but some have other status than requested [0,1,2,None] looking at the sql query : SELECT [..] FROM `app_article` LEFT OUTER JOIN `app_status` ON (`app_article`.`status_id` = `app_status`.`id`) WHERE (`app_article`.`status_id` IN (1, 2) OR `app_status`.`id` IS NULL) ORDER BY [...] the OR app_status.id IS NULL part seems to be the cause. if i change it to OR app_article.status_id IS NULL it works correctly. How to deal with this ? Thanx.

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• Any advantage to using SVG font in @font-face instead of TTF/EOT?

  - by nimbupani

  I am investigating the usage of SVG fonts in @font-face declaration. So far, only Safari 4 and Opera 10 seem to support it (see an example for test [1]). Firefox 3.5 does not support it but there is a bug report [2] but no fix has been supplied yet (though there are patches). I also came across this discussion[3] which tangentially talks about advantages/disadvantages of SVG fonts. I am wondering, with @font-face support in major browsers, what is the advantage of using SVG font format in lieu of TTF/OTF/EOT formats? The only advantage I can glean from the discussion linked above was that you can add your own missing gylphs to fonts that do not support them yet. Is there any other reason to specify SVG fonts in CSS? [1], [2], [3] links respectively in http://linkbun.ch/e3mc

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• receiving OPTIONS instead of GET requests?

  - by Urs

  Hi, all I want to achieve is to implement a servlet providing a json feed for my fullcalendar application. When I inspect http://arshaw.com/js/fullcalendar/examples/json.html with Bugzilla, I see that GET-requests are sent to receive the json feed. However, when I use this example within my scenario, fullcalendar seems to send OPTIONS-requests. The only difference is that I replaced "events: "json-events.php" with "http://localhost:8080/CalendarServletTest/HelloWorldServlet" (the url of my servlet). What do I miss? or is this really a bug?

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• Is there a work around for setAppCacheEnabled on WebView for an Android 2.1 application causing the

  - by Kevin

  We have an HTML 5.0 web application that we ported to Android. It's our intention to run this in a Native Wrapper. Our application uses the ApplicationCache to run offline. This works find when running under the browser. While being hosted in a WebView within a native application, after the last file is downloaded and stored in the ApplicationCache from the manifest the application is terminated and does a core dump. This appears to be a documented bug. http://code.google.com/p/android/issues/detail?id=7939 Has anyone doing anything similar found a work around for this issue?

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• Memory leak in Mozilla when unloading stylesheets

  - by KaptajnKold

  I'm working with Mozilla v1.7.12 on a constrained device (a Motorola set-top box) trying to resolve some memory leaks. When I dynamically load a stylesheet which refers to some large images, I can see that the amount of consumed memory increases in correspondance with the size of the images. This is what I would expect. Then, when I remove the stylesheet from the DOM, I would expect the memory to be freed. However, this does not happen. This is a problem, because the web application I'm working on needs to be able to dynamically load and and unload stylesheets potentially many times in the lifetime of the page. My question therefore is this: Is what I'm seeing expected behavior or is it a known bug? Is there a way to work around this? I should point out that I've set the expires header to -1 on all the images in the stylesheet.

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• Should I 'delete' this CDC?

  - by Binary Worrier

  Folks, I'm trying to track down an intermittant bug that's showing up on site. I've a feeling it's in some GDI code I'd to cobble together to get a tally printer working. I'm connfused over how to delete this CDC, my code looks OK to me, but is this correct. // Create a device context for printing CDC* dc = new CDC(); if(! dc->CreateDC(safeDriverName.AsBSTR(), safePrinterName.AsBSTR(), NULL, NULL)) { throw . . . } // as I finish with the CDC dc->DeleteDC(); delete dc; Do I need delete dc after dc->DeleteDC();? Thanks

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