wrapper | 易学教程

@JsonSerialize - How to create a wrapper at runtime and use default serialization for the object fields?

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问题 I want to add a wrapper which named is determined at runtime, because it depends of the class name (I could use @JsonRootName but I don't want to because I would have to use it on every sub class, which is not efficient). I suppose I should use @JsonSerialize to override the default serializer, but I want that just to create the wrapper; I don't want to serialize the object fields myself (also I am in an abstract class, so I don't even know the fields of the sub class!). I don't care about

Groovy (or Java) - Pass by reference into a wrapper object

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问题 Is it possible in Java (or Groovy) to pass an object by reference into a wrapper object (ie: List or Map)? Example code (in Groovy): def object = null def map = [object: object] object = new Object() Unfortunately map.object remains null even though the object variable doesn't, so obviously the original creation of the map was done by value not by reference. Is it possible to create a List or Map via references so that when the object outside the List or Map changes the change is reflected

Failed to connect to the java service wrapper (java.net.ConnectException)

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问题 I'm trying to run RunDeck server as a windows service using java wrapper, guided by this article: http://www.phwitservices.com/2014/06/rundeck-windows-service Service is successfully installed, but unfortunately failed to start. Extented log says: INFO | jvm 1 | 2015/12/21 17:24:02 | WrapperManager Error: Failed to connect to the Wrapper at port 32 000. Cause: java.net.ConnectException: connect: Address is invalid on local machine, or port is not valid on remote machine Command line: DEBUG |

Web Scraper抓取扇贝单词

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最近背单词，发现扇贝单词效率太低了，然后想办法将扇贝单词抓出来，导入到其他背单词的软件里，比如知米使用Web Scraper 插件搞定： {"_id":"shanbay","startUrl":["https://web.shanbay.com/wordsweb/#/words-table"],"selectors":[{"id":"NotLearn","type":"SelectorElementClick","parentSelectors":["_root"],"selector":"_root","multiple":false,"delay":2000,"clickElementSelector":"div#4 ","clickType":"clickOnce","discardInitialElements":"do-not-discard","clickElementUniquenessType":"uniqueText"},{"id":"word","type":"SelectorText","parentSelectors":["_root","page"],"selector":"div[class^='index_wordName']","multiple":true,"regex":"","delay":0},{"id":"page","type"

Getting SwiftUI wrapper of AVPlayer to pause when view disappears

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问题 TL;DR Can't seem to use binding to tell wrapped AVPlayer to stop — why not? The "one weird trick" from Vlad works for me, without state & binding, but why? See Also My question is something like this one but that poster wanted to wrap an AVPlayerViewController and I want to control playback programmatically. This guy also wondered when updateUIView() was called. What happens (Console logs shown below.) With code as shown here, The user taps "Go to Movie" MovieView appears and the vid plays

Install GDL for use in Python

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问题 I need to use some GDL routines from my Python code. In the GitHub repo of GDL project there is an example very intuitive: >>> import GDL >>> print GDL.function("sin",(1,)) 0.841470956802 But, seeing the INSTALL.MAKE file from the repo, it appears that I have to build GDL as a Python module. The question is: How I can build/install GDL in order to be used as a Python module, like the example before? 来源： https://stackoverflow.com/questions/48954138/install-gdl-for-use-in-python

Pybind11: Transfer Class Ownership to C++ on Construct

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问题 I'm having an issue where a python class, which is derived from a c++ base class using pybind11, is being immediately destructed (garbage collected). I would like C++ to take ownership of the dynamically allocated object, but I can't seem to make that happen. I've tried keep_alive, passing shared_ptr<> as py::class_ template argument, and py::return_value_policy... nothing is working. I suspect this is just user error. This is a simplification of the real issue I'm having with a much larger

Wrapping a glibc function using the dynamic linker

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问题 I am trying to wrap the GLIBC fstat function (it could be any other: it is just a proof of concept) by injecting my library to an executable. I do this by placing my library where the executable's RPATH is pointing with the name libc.so.6 . The source code of my library is the one below: #define _GNU_SOURCE #include <stdio.h> #include <sys/stat.h> #include <sys/types.h> #include <dlfcn.h> int fstat(int fd, struct stat *buf){ typeof(fstat) *old_fstat; // Try with a printf... printf("HOOT!

Wrapping a glibc function using the dynamic linker

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Wrap C++ template class with boost python

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问题 I am try to wrap a C++ template class with booth python. I get errors with the current wrapper. The program is basically for creating customized vector's and use it in python. #include <boost/python.hpp> template <class T> class allocator{ public: T* allocate(size_t); void deallocate(T* , size_t); void construct(T*,T); void destroy(T*); }; template <class T> class vec{ typedef T* iterator; typedef const T* const_iterator; typedef size_t size_type; typedef T value_type; vec(){ create(); }