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  • What is crtbegin.o and crtbegin_dynamic.o?

    - by theactiveactor
    When debugging a link error (undefined reference to _dso_handle) using the Android x86 toolchain, I noticed it's statically linking crtbegin_dynamic.o. What is the purpose of this file? There is another similar crtbegin.o in the toolchain install directory that contains the missing symbol (_dso_handle). What is the difference between crtbegin.o and crtbegin_dynamic.o?

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  • No scrolling occurs when UITableView scrollToRowAtIndexPath is invoked

    - by theactiveactor
    My view contains a simple TableView with 6 rows and a button that invokes doScroll when clicked. My objective for doScroll() is simply scroll to the 5th cell such that it's at top of the table view. - (void)doScroll: (id)sender { NSIndexPath *index = [NSIndexPath indexPathForRow:4 inSection: 1]; [m_tableView scrollToRowAtIndexPath:index atScrollPosition:UITableViewScrollPositionTop animated:YES]; } However when doScroll is invoked, the tableview scrolls only slightly. I suspect this has something to do with the size of the scroll view. So I tried increasing the height of m_tableview.contentsize before scrolling. After I do this however, no scrolling occurs at all... The view controller is a simple UIViewController and refers to the table view via IBOutlet. For some reason, scrolling works as expected for the default Navigation Based Application, where the controller is a UITableViewController

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  • Receiving Error Domain=kCFErrorDomainCFNetwork Code=2 when attempting to read from ReadStream

    - by theactiveactor
    I'm attempting to synchronously read from a CFReadStream objected created by CFStreamCreatePairWithSocketToHost. The stream opened fine but when I attempt to invoke CFReadStreamRead on it in a loop, CFReadStreamRead() returns -1 and the resulting error is: Error Domain=kCFErrorDomainCFNetwork Code=2 "The operation couldn’t be completed. (kCFErrorDomainCFNetwork error 2.)" UserInfo=0x14a920 {kCFGetAddrInfoFailureKey=8} I'm also receiving this same exact error when using this ReadStream asynchronously- the first callback I receive is this error.

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  • displaying list of registered user in django-admin

    - by theactiveactor
    My Book model has an author attribute which today is simply a CharField. The value for author should be one of the registered users of my Django site. When creating a new Book object in Django admin, I would like author to be displayed as a combo box showing all registered users. How would I go about achieving this?

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  • display one-to-many relationship for a model in Django admin (list mode)

    - by theactiveactor
    In Django admin site, when listing all the objects for a given model, I know we can customize which columns get displayed for a ModelA via list_display Say that ModelA has a one-to-many relationship with ModelB. I would like to add another column on the listing page for ModelA, where each entry is a URL pointing to all objects of ModelB having a foreign key relationship on corresponding instance of Model A in that row. How can I achieve this customization with the admin app?

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  • Detecting network adapter changes on the iPhone

    - by theactiveactor
    Say that there are no WIFI networks currently available and my network-enabled app is connected over 3G. How can I detect if a user has roamed into a WIFI network? I would also like to detect the case when the user is connected over WIFI and suddenly received 3G signal. In other words, I would like to be asynchronously notified of network adapter changes. I tried using the SCNetworkReachability framework asynchronously but found that for some reason, I am not receiving Wifi-related events (i.e. adapter on/off) when connected over 3G.

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  • Querying with foreign key

    - by theactiveactor
    Say I have 2 tables whose structures are as follows: tableA id | A1 | A2 tableB id | tableA_id (foreign key) | B1 Entries in A have a one-to-many relationship with entries in B. What kind of query operation would I need to achieve "something like this: select all objects from table B where A1="foo""? Basically, apply a query on tableA and from those result, find corresponding dependent objects in tableB

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  • Passing session data to ModelForm inside of ModelAdmin

    - by theactiveactor
    I'm trying to initialize the form attribute for MyModelAdmin class inside an instance method, as follows: class MyModelAdmin(admin.ModelAdmin): def queryset(self, request): MyModelAdmin.form = MyModelForm(request.user) My goal is to customize the editing form of MyModelForm based on the current session. When I try this however, I keep getting an error (shown below). Is this the proper place to pass session data to ModelForm? If so, then what may be causing this error? TypeError at ... Exception Type: TypeError Exception Value: issubclass() arg 1 must be a class Exception Location: /usr/lib/pymodules/python2.6/django/forms/models.py in new, line 185

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  • python tarfile adding files without directory hiearchy

    - by theactiveactor
    When I invoke add() on a tarfile object with a file path, the file is added to the tarball with directory hiearchy associated .In other words, if I unzip the tarfile the directories in the original dir hiearchy are reproduced. Is there a way to simply add a plainfile without directory info that untarring the resulting tarball produce a flat list of files?

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