construct | 易学教程

How to make json.dumps in Python ignore a non-serializable field

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问题 I am trying to serialize the output of parsing some binary data with the Construct2.9 library. I want to serialize the result to JSON. packet is an instance of a Construct class Container . Apparently it contains a hidden _io of type BytesIO - see output of dict(packet) below: { 'packet_length': 76, 'uart_sent_time': 1, 'frame_number': 42958, 'subframe_number': 0, 'checksum': 33157, '_io': <_io.BytesIO object at 0x7f81c3153728>, 'platform':661058, 'sync': 506660481457717506, 'frame_margin':

How to proxy JavaScript creation primitive

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问题 I want to do something when creating a string, for example: String = new Proxy(String, { construct: (t, a) => { return { a: 123 } } }) console.log(new String('q')) // { a: 123 } However, if you use primitives, it doesn't work. String = new Proxy(String, { construct: (t, a) => { return { a: 123 } } }) console.log('1') // Expected: { a: 123 }, Actual: 1 Is there any way? then the second question is, when the runtime converts primitives, can I proxy the process? var a = '123' // This is a

c++类的构造函数

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类的定义 class classname { private: data; function(); public: data; function();//可以将成员函数的定义直接写在类中，作为内联函数（1-5行，简单） protected: data; function(); }；三种访问权限 public:可以被任意实体访问 protected:只允许子类及本类的成员函数访问 private:只允许本类的成员函数访问 class默认的权限是private 项目类的实现通常将类的定义写在一个.h文件中，成员函数的定义写在一个程序文件.cpp中，将接口与实现分离 myapp.h，在头文件中定义类 #ifndef MYAPP_H_INCLUDED #define MYAPP_H_INCLUDED class Record { private: //private成员 char bookname[20]; //数据成员bookname，用于表示图书的名称 int number; //数据成员number，表示图书编号 public: //public成员（构造和析构函数？） void regist(char *a,int b); //成员函数regist，用于给各数据成员赋值 void show(); //成员函数show，显示各数据成员的值 }; #endif // MYAPP_H

My code with str_replace don't work

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问题 why this code isn't working? I was trying to rename, switch location and other, but it seems to be str_replace bug. It would be nice, if somebody told me, what's wrong... This is my index.php <?php header('Content-Type:text/html;charset=utf-8'); session_start(); require_once ('inc/core.php'); $core = new core($_GET['viev']); this is core.php <?php class core{ var $template; var $view; public function __construct($view) { $this->template = $this->loadTemplate(); $this->view = $view; $this-

C++ node assign error: Thread 1: EXC_BAD_ACCESS (code=1, address=0x0)

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问题 I am learning DSA , Linked List , new to C++. My linked list is of exception. Error Info: It is much longer than it should be. Here is my code: define struct ListNode // Definition for singly-linked list. struct ListNode { int val; ListNode *next; ListNode(int x) : val(x), next(NULL) {} }; get Intersection of Two Linked Lists ListNode * Solution_three :: getIntersectionNode(ListNode *headA, ListNode *headB) { ListNode * p_one = headA; ListNode * p_two = headB; if (p_one == NULL || p_two ==

PDO __constructs expects at least 1 parameter, 0 given

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问题 I have database class and constructor function this: <?php class Connection { private $PDO; function __construct() { $username = 'root'; $password = 'password'; $PDO = new PDO('mysql:dbname=PROOV;host=localhost', $username, $password); return $this->PDO; } } ?> And the other class that extends it: <?php //$query = 'SELECT part_description FROM SparePartRequests LIMIT 100'; include_once 'connection.php'; class Proov extends PDO { public function returnRows() { $sth = $this->prepare('SELECT

How to extend classes in purchased product (Multiscraper) built on Codeigniter 2.1.3

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问题 I hope my question is specific enough, even though most of you may be unfamiliar with Multiscraper (MS), you are probably familiar with Codeigniter (CI). MS is basically built on CI 2.1.3, and is a webpage scraper for various shopping carts. I will give a specific example of a class I want to extend. e.g. file path: multiscraper\application\controllers\opencart\process.php class: class Process extends CI_Controller { ... } So, why do I want to extend this class? Because I have modifications

C++ equivalent of Python's “construct” library

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问题 I'm looking for a library equivalent Python's "construct", maybe somebody has ported it. Construct is a powerful declarative parser for binary data. It is based on the concept of defining data structures in a declarative manner, rather than procedural code: Simple constructs can be combined hierarchically to form increasingly complex data structures. It's the first library that makes parsing fun, instead of the usual headache it is today. This is similar question for java. Java equivalent of

Java equivalent of Python's “construct” library

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问题 Is there a Java equivalent of Python's "construct" library? I want to write "structs" like so: message = Struct("message", UBInt8("protocol"), UBInt16("length"), MetaField("data", lambda ctx: ctx["length"]) ) It doesn't have to specifically be a library with some sort of abstraction using the Java language. I mean, it could be a "portable" format, with an API for parsing the documents. I guess this could work out with XML, but it would be be a lot more ugly. I realize I could just inter

Build tree from edges

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问题 I have the edges and i want to build a tree with it. The problem is that i can construct my tree structure only when edges are in specific order. Example of orders: (vertex, parent_vertex) good: bad: (0, ) <-top (3, 2) (1, 0) (1, 0) (2, 1) (3, 2) (3, 2) (0, ) <-top I iterate throw the edges and for current vertex trying to find it's parent in created tree, then i construct the node and insert it. result tree: 0 - 1 - 2 - 3 So there is always must exist a parent in the tree for the new added