ios - Objective-C pointer and swift -


i'm following apple document, unfortunately examples written on objective-c, have confidence swift language , can not understand meaning of things, in particular, in example: 

void runloopsourcesperformroutine (void *info){     runloopsource*  obj = (runloopsource*)info;     [obj sourcefired]; }

this line: runloopsource* obj = (runloopsource*)info;

the parameter: void *info indicates info pointer void, can put address of type of data structure, following various apple documents saw translation of : void *info swift language :

info: unsafemutablerawpointer?

now, runloopsource* obj = (runloopsource*)info; line indicates obj variable of type: runloopsource, , assigned value of (runloopsource *) info, precisely mean statement? : (runloopsource *) info, , how translates in swift language ?

what dealing (void *info) c pointer-to-void, arrives swift form of unsaferawpointer. means type info has been cast away , memory being managed elsewhere.

in order work thing believe be, i.e. runloopsource, need characterize explicitly runloopsource. in c, cast, in example code posted: (runloopsource*)info. in swift, rebind.

observe in case whole thing has been made little more complicated fact unsafemutablerawpointer has been wrapped in optional, , have unwrapped before can @ all.

assuming, then, in case, info unsafemutablerawpointer? bound runloopsource, can say:

let rlsptr = info!.assumingmemorybound(to: runloopsource.self) let rls = rlsptr.pointee

now rls is runloopsource , can work like. keep in mind, however, memory unmanaged, should work here , now.

edit way, apple has nice document on entire matter: https://swift.org/migration-guide/se-0107-migrate.html


-

Comments

Post a Comment

Popular posts from this blog

python - How to insert QWidgets in the middle of a Layout? -

Image
i'm using qt framework build graphical user interface. use qgridlayout position qwidgets neatly. gui looks this: my application regularly adds new widgets gui @ runtime. these new widgets not added @ end of qlayout, somewhere in middle. the procedure bit cumbersome. applied on figure above, need take out widg_c , widg_d , ... qgridlayout. next, add widg_x and widg_y , , put other widgets again. how remove widgets qgridlayout: for in reversed(range(mygridlayout.count())): self.itemat(i).widget().setparent(none) ### as long you're dealing small amount of widgets, procedure not disaster. in application display lot of small widgets - perhaps 50 or more! application freezes second while procedure ongoing, annoying user. there way insert widgets somewhere in qlayout, without need take out other widgets? edit: apparently solution qvboxlayout simple. use function insertwidget(..) instead of addwidget(..) . docs can found link: http://doc.qt.io/qt-5/qboxlayou
Read more

python - serve multiple gunicorn django instances under nginx ubuntu -

i need serve 2 webs apps (django) on gunicorn under different domain names using nginx on ubuntu. started using tutorial: https://www.digitalocean.com/community/tutorials/how-to-set-up-django-with-postgres-nginx-and-gunicorn-on-ubuntu-16-04 it worked fine 1 using that. tried same thing second gives me 502 gateway second domain. tried following tutorial: http://michal.karzynski.pl/blog/2013/10/29/serving-multiple-django-applications-with-nginx-gunicorn-supervisor/ i'm @ part run gunicorn start script: sudo bin/gunicorn_start i response: starting webuildblack root traceback (most recent call last): file "/home/devin/webuildblack/bin/gunicorn", line 7, in <module> gunicorn.app.wsgiapp import run importerror: no module named 'gunicorn.app'; 'gunicorn' not package you have named program gunicorn.py gunicorn -package. rename file , remove gunicorn.pyc file.
Read more

module - Prestashop displayPaymentReturn hook url -

i new prestashop developer , trying create paymentmodule. have got show payment method can not proceed purchase because not know hot works. does know should redirect run hooddisplaypaymentreturn method? i happy if explain me complete navigation map make purchase. anyway, can find relation between hooks , pages? when have new module payment rely on simplest provided prestashop: bankwire. inside can find 3 hooks. hookpayment: public function hookpayment($params) { if (!$this->active) return; if (!$this->checkcurrency($params['cart'])) return; $this->smarty->assign(array( 'this_path' => $this->_path, 'this_path_bw' => $this->_path, 'this_path_ssl' => tools::getshopdomainssl(true, true).__ps_base_uri__.'modules/'.$this->name.'/' )); return $this->display(__file__, 'payment.tpl'); } hookdisplaypaymenteu: public fun
Read more