callback

问题 Using ctypes to interface my python3 code with a C API. One of the C functions registers a callback function– i.e. it takes a function pointer to the callback and a void* userdata to be made available in that callback. // typedef and C function in myClibrary.so typedef void(__cdecl *callback_function_type)(void*); int RegCallback(callback_function_type callback_function, void* userbdata); I have successfully defined the required callback function type in python using CFUNCTYPE() , passed an

问题 Using NServiceBus 6's Callback feature I have found no way to alert the client that the request handler failed. The request handler will go through all the recoverability steps, and eventually put the message into the error queue. Meanwhile, the client just sits there waiting for its reply. // Client code (e.g. in an MVC Controller) var message = new FooRequest(); var response = await endpoint.Request<FooReponse>(message); // Handler code public class FooRequestHandler : IHandleMessages

问题 I'm trying to use the node.js package readline to get user input on the command line, and I want to pipe the entered input through promises. However, the input never gets through the then chain. I think the problem could come from the fact that the promises are fulfilled in the callback method, but I don't know how to solve that problem. An example of this problem looks like this: import rlp = require('readline'); const rl = rlp.createInterface({ input: process.stdin, output: process.stdout }

问题 I am trying to use Keras to implement the work done in A General and Adaptive Robust Loss Function. The author provides tensorflow code that works the hard details. I am just trying to use his prebuilt function in Keras. His custom loss function is learning a parameter 'alpha' that controls the shape of the loss function. I would like to track 'alpha' in addition to the loss during training. I am somewhat familiar with Keras custom loss functions and using wrappers, but I am not entirely sure

问题 I'm trying to add Google's reCAPTCHA into my Codeigniter web app. But I keep running into this problem: Unable to access an error message corresponding to your field name Captcha. (recaptcha) I try submitting the form to throw an error, $server_output['success'] should be FALSE thus executing $this->form_validation->set_message('recaptcha', 'Please redo the {field}.'); but Codeigniter doesn't seem to be running the callback function at all... The Validation is working for everything else as

问题 I'm using firebase/firestore and I'm looking a way to return promise of snapshot. onlineUsers(){ // i want to return onSnapshot return this.status_database_ref.where('state','==','online').onSnapshot(); } in other file I did componentDidMount(){ // this.unsubscribe = this.ref.where('state','==','online').onSnapshot(this.onCollectionUpdate) firebaseService.onlineUsers().then(e=>{ console.log(e) }) } I get the errors Error: Query.onSnapshot failed: Called with invalid arguments. TypeError:

问题 I am trying to update the text in a TextView which is located in the activity to show the total price when an item is deleted from RecyclerView. But how can I update a view which belongs to activity from an adapter? 回答1: Here is the solution. Create a public interface called ItemsInteractionListener which has a method void onTotalPriceChanged(double newPrice); inside adapter Create an object of the interface called mListener inside the adapter Create a public setter for mListener Create a

问题 Below is the code that I'm working with. function my_tab( $tabs ) { // the following array will be created dynamically $colors = array("red", "white", "blue"); foreach ($colors as $value) { $tabs[$value] = array( 'name' => $value ); // start creating functions function content_for_[$value]() { echo "this is the " .$value. " tab"; } // stop creating functions add_action('content_for_'.$value, 'content_for_'.$value); } return $tabs; } As you can see, I have an array that's created dynamically.

问题 How do I setup/register a callback function, in C++, to call a function when there is data to be read from a queue? Edit 1: Using Neil's answer for a complete answer (in header file): #include <vector.h> class QueueListener { public: virtual void DataReady(class MyQueue *q) = 0; virtual ~QueueListener() {} }; class MyQueue { public: void Add (int x) { theQueue.push_back(x); for (int i = 0; i < theCallBacks.size(); i++) { theCallBacks[i]->DataReady(this); } } void Register (QueueListener *ql)

问题 How do I setup/register a callback function, in C++, to call a function when there is data to be read from a queue? Edit 1: Using Neil's answer for a complete answer (in header file): #include <vector.h> class QueueListener { public: virtual void DataReady(class MyQueue *q) = 0; virtual ~QueueListener() {} }; class MyQueue { public: void Add (int x) { theQueue.push_back(x); for (int i = 0; i < theCallBacks.size(); i++) { theCallBacks[i]->DataReady(this); } } void Register (QueueListener *ql)