wrapper | 易学教程

Easiest way to add a function to existing class

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问题 I'm using the python's built-in shelve module to manage some simple dictionaries. The problem I'm having is I want to use with shelve.open(filename) as f: , but when I try it claims DbfilenameShelf has no attribute __exit__ . So, I'm guessing the easiest way to do this is to wrap it in another class and add an __exit__ function to that wrapper. I tried this: class Wrapper(shelve.DbfilenameShelf): def __exit__(self): self.close() def __init__(self, filename, writeback=False): shelve

Error building cython with python3 error: 'PyString_AsString' was not declared in this scope

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问题 I am having trouble compiling a c extension using cython in python 3. It compiles and works fine with python 2.7, but in python 3.4.3 I get the following error when building with 3.4 (anaconda distribution): python setup.py build_ext --inplace running build_ext building 'module' extension gcc -pthread -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -fPIC -Iincludes -I/home/user/anaconda/include/python3.4m -c module.cpp -o build/temp.linux-x86_64-3.4/module.o cc1plus: warning: command line

Wrapper for open() and open64() and see that system calls by vi uses open64()

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问题 I have written wrappers for both open() and open64( ). Now I run vi by preloading my wrapper library using LD_PRELOAD environment variable and I see that the open64() wrapper is used instead of the open() . But when I strace vi I see that the system calls made is to open() (of course including the other system calls). What is the issue here? 回答1: The strace utility traces system calls (syscall) and open happens to be both a syscall and a library function. Both the open() and open64() library

Smart way to construct class member std::vector<std::unique_ptr<AClass> >

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问题 This question combines unique_ptr as class member and move semantics fail to compile with clang and C++ std::vector in constructor. My goal is to construct a wrapper struct V_wrapper{ std::vector<std::unique_ptr<AClass> > vec; V_wrapper(std::vector<std::unique_ptr<AClass> > v) : vec{std::move(v)} {} }; Unfortunately this code does not compile, because the compiler (clang Apple LLVM version 4.2) attempts to copy construct the vector v which is not supported. On the other hand, if I design an

wrong file and line in log4net wrapper

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问题 I wrote a log4net wrapper public class Log4NetWrapper : ILogger { private readonly log4net.ILog logger; public Log4NetWrapper(string loggerName) { logger = log4net.LogManager.GetLogger(loggerName); } public void Debug(string message, params object[] values) { logger.DebugFormat(message, values); } public bool IsDebugEnabled {get { return logger.IsDebugEnabled; } } ... } the problem is that the line and file I get when logging is of the wrapper and not the actual location of the message. 回答1:

c++ multithreaded windows GUI (accessing the forms)

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问题 I've written a simple console application using windows sockets to work as a proxy between a server and a client. I decided to make a graphical interface for watching all the in/outgoing packets real time (like a very simple wireshark). The connection between the server and the client runs on a different thread than the message loop. When the server/client sends a packet, I would like that to be displayed (for example added to a simple text control) immediately. But since I can not access the

c++ multithreaded windows GUI (accessing the forms)

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Python 进阶之源码分析：如何将一个类方法变为多个方法？

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【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 前一篇文章《 Python 中如何实现参数化测试？》中，我提到了在 Python 中实现参数化测试的几个库，并留下一个问题： > 它们是如何做到把一个方法变成多个方法，并且将每个方法与相应的参数绑定起来的呢？我们再提炼一下，原问题等于是：在一个类中，如何使用装饰器把一个类方法变成多个类方法（或者产生类似的效果）？ # 带有一个方法的测试类 class TestClass: def test_func(self): pass # 使用装饰器，生成多个类方法 class TestClass: def test_func1(self): pass def test_func2(self): pass def test_func3(self): pass Python 中装饰器的本质就是移花接木，用一个新的方法来替代被装饰的方法。在实现参数化的过程中，我们介绍过的几个库到底用了什么手段/秘密武器呢？ 1、ddt 如何实现参数化？先回顾一下上篇文章中 ddt 库的写法： import unittest from ddt import ddt,data,unpack @ddt class MyTest(unittest.TestCase): @data((3, 1), (-1, 0), (1.2, 1.0))

Wrapping an executable jar file with an icon

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问题 Background: I created a simple GUI in java and can run that GUI by clicking its executable jar file. I created the GUI in java so that it could be ran on more than one OS. Question: Is there a way to make some sort of "wrapper icon" for the jar file so that when I click it (the icon) the GUI opens up? To be clear I am not talking about changing the .jar file icon, that is determined by the OS. I successfully converted the jar file to a .exe, .app and .sh file with the intent of running a cmd

PHP extension wrapper for C++ [closed]

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问题 This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, visit the help center. Closed 6 years ago . I am new in this area of writing extension for PHP, however I need to create a wrapper class for C++ to PHP. I am currently using PHP 5.2.13. I read this