interface

问题 This is a follow up question from here but is of totally different nature. The reason i mention it is because I wanted to provide premise. Basically I'll have a few Datatables (or serialize classes) that will contain over a million rows and will be very hard to return from SQL. So using an example I found I derived a TCP Channelservices utilizing MarshalByRefObject to return the top x rows. However this really isn't powerful enough for what I want to do. I'm curious out of the code below, how

问题 Let me explain: I know that, in Java , you can do stuff like this: int myMethod(Burnable obj){ /*do stuff that's only applicable if the argument implements the Burnable *interface */ } I like programming in PHP the most, and I'm not sure whether I can do that in PHP too . Furthermore, I'd like to know what other reasonably mainstream languages that feature this, as in my view it's a way of building modularity into your code. Thank you 回答1: All statically-typed languages (C, C++, Java,

问题 I want to compose several "traits" across several modules. A function might require multiple such "traits" as its input, i.e.: type 'a x_t = < get_x : int ; .. > as 'a constraint 'a = < get_b : float ; .. > val foo : x_t -> float composing these traits manually in the interface is cumbersome and error-prone, but perfectly possible. But in an ideal world, I should be able to use the "trait's" name instead of manually composing all the required fields, i.e. write something like: type 'a x_t = <

问题 Is there a way to indicate optional method in the interface (so that the contract only indicated the number / type of arguments to be given)? Please give maybe a little more understanding and insight into the problem, and indicate a solution? See for instance this discussion: Optional Methods in Java Interface In the app I'm using Listeners connected to the Persistence (Doctrine). So I'm using some of these methods: prePersist() preUpdate() postPersist() postUpdate() etc. Now, while

问题 Is there a way to know if the cancel button is pressed by the user if the interface controller was displayed modally? Let's say you want to do something before the interface controller is dismissed. 回答1: The only method available is -didDeactivate . This will get called when the screen will disappear or when the app will close. Unfortunately, there is no direct way to know when the cancel button is pressed. 回答2: If you need to do some things when the controller will be dismissed you can also

问题 I am trying to pass data from an Android Activity to a Service. I am attempting to do so by calling a method within another class which contains an interface,this interface is implemented by the Service. MQTTNotifier(Activity) >> MQTTServiceDelegate(Middle Man, Has Interface) >> MQTTService (Implements Interface) Is this possible? I cannot seem to get the String topic any further than the MQTTServiceDelegate subscribeToTopic() method, I would like to forward it to the Service now.

问题 Can anyone confirm that [[UIDevice currentDevice] setOrientation:UIDeviceOrientationPortrait]; will get your app rejected by Apple. Is there a good replacement available? 回答1: [[UIDevice currentDevice] setOrientation:UIInterfaceOrientation] is a private API, you can find that is signature is only in read-only (see here). If you want set the device orientation to Portrait or other mode you should override the shouldAutorotateToInterfaceOrientation: -(BOOL)shouldAutorotateToInterfaceOrientation

问题 How can I configure JSch client to communicate using network interface other than default one? 回答1: I do not think that it is possible. I have the same requirement and checked the source code provided along with JSch. The plain Socket is created without a local address or port. 回答2: You can implement the SocketFactory interface to create a custom socket with a specified source interface, and then use session.setSocketFactory(...) to plug it into your JSch session. 来源： https://stackoverflow

问题 has anyone used the IExternalizable interface? ... I have a fundamental question. When I haved serialized my object ... and have saved as a file .... and now I wants to make some changes in the class ... e.g. add an attribute ... I can not re-convert the file into an object of this class ... because in the readExternal method is now one more attribute, which the stored object (file) does not own .... is there a way to make this more flexible? -- // german Hallo hat schon mal jemand das im

问题 This is a follow up from my previous post. Read that post for context. Note that it is not strict COM interop - but the C++ interfaces are COM compatible. Im trying to implement this C++ interface in C# class IPluginFactory : public FUnknown { virtual tresult PLUGIN_API createInstance (FIDString cid, FIDString iid, void** obj) = 0; }; My C# code looks like this: [ComImport] [Guid(Interfaces.IPluginFactory)] [InterfaceType(ComInterfaceType.InterfaceIsIUnknown)] public interface IPluginFactory