interface

问题 I am having trouble iterating over slices of interfaces that contain slices of interfaces. This problem has arisen through attempting to work with an API call which returns JSON data. There is quite a lot of data returned and the structure differs quite dramatically depending on the request. There is also no structure for the JSON responses in the API documentation so I am trying to implement some methods for working with arbitrary JSON responses. Presently when the initial call is made it is

问题 Please tell me if this is possible. I have a client win form app and a wcf app in C#. This is my model. Common Project public interface IServiceA { string DoWorkA(); } I am not using ServiceContract or OperationContract attributes here in Common project. Now, ClientProject references the Common Project. ServiceProject also references the Common Project. In ServiceProject, I am using a Service Contract as shown below: [ServiceContract] public interface IGetData : IServiceA { // Implements

问题 As I know the subclass constructor calls the super class constructor by using super(); . But since interface doesn't have any constructor, how can inheritance take place? 回答1: But since interface doesn't have any constructor how can inheritance take place?? Easy, an interface cannot have any instance fields so there is nothing to construct. You cannot place in code in an interface (up to Java 7 anyway) so there is nothing which needs to be called. 回答2: The interface is a contract, defining

问题 I bring today another question that is burning my head, I do import a DAO 3.6 type library to my delphi 7, and I start to see many interesting intefaces so I face on intriguing question. Every time the class Fields appears on property of another class, they have the right definition, I mean, he is defined as Fields, but in Index class, in the parts where he describes all fields participants of his structure, the property fields appears not as Fields, but as OleVariant. Look at the diference

问题 I have a little problem. As the title says I want to release an object whose class implements an interface, however I get an error "invalid pointer operation" . My Interface: Interface Type // An interface definition IMessageEvents = Interface(IInterface) ['{BD27EFC6-CC9A-437A-A8B8-16F722518836}'] Procedure messageReceived(messageData: String); End; Implementation My Class: Type TChatManager = Class(TInterfacedObject, IMessageEvents) Private Protected Procedure messageReceived(messageData:

问题 I want to create a python wrapper for my C++ library. It would be cool, if there is a automatic conversion of std::vector to python lists and the other way round. Unfortunatly if I add this code to my Interface-file I still get errors in run-time. %typemap(in) std::vector<float> value (std::vector<float> vIn) { int iLen = PySequence_Length($input); for(unsigned int i = 0; i < iLen; i++) { PyObject *o = PySequence_GetItem($input, i); if (PyNumber_Check(o)) { vIn.push_back((float)PyFloat

问题 Say I have an Interface like this in a project called "Interface": public interface TestInterface { string Operation(); } and class which implements it. This class is located in another project "Class": public class TestClass : TestInterface { public TestClass() { } public string Operation() { return "This is an Operation"; } } My client does something like this (which is again in a different project "Client"): class Program { static void Main(string[] args) { TestInterface i = new TestClass(

问题 I would think it's fairly straightforward to cast an IDictionary<TKey, IList<TValue>> object to an IDictionary<TKey, IEnumerable<TValue>> , but var val = (IDictionary<TKey, IEnumerable<TValue>>)Value; throws a System.InvalidCastException , and var val = Value as IDictionary<TKey, IEnumerable<TValue>>; makes val null. What is the proper way to cast this? 回答1: I would think it's fairly straightforward to cast an IDictionary<TKey, IList<TValue>> object to an IDictionary<TKey, IEnumerable<TValue>

问题 I've seen some code written this way: @interface AViewController(Private) I wanted to know if that (Private) means something when submitting to the App Store? What does it mean in general? 回答1: It's a category called 'Private'. Have a look in the Categories and Extensions chapter of the Objective-C programming reference What it means is that it is an addition to the AViewControler class that has been named 'Private' for convenience. It could have been called anything or even left blank to

问题 I have a method, that should accepts any object, as long as all its fields are strings or numbers I made this, which works great with duck typing static interpolateParams( route: string, params: {[key: string] : string | number}) : string { const parts = route .split("/") .map(part => { const match = part.match(/:([a-zA-Z09]*)\??/); if (match) { if (!params[match[1]]) { console.error("route argument was not provided", route, match[1]); return part; } return params[match[1]]; } else { return