callback

Javascript passing array as parameter to function

由 醉酒当歌 提交于 2020-01-02 18:04:38
问题 I have two function that accept an array as parameter, these function do a simple work, making all element of the array to zero. First function using forEach() method and passing a callback to it: function pass_arr(x) { x.forEach(function(y){ y = 0; }); } And I call it this way: var a = ["a", "b", 1, 3, "stringg"]; pass_arr(a); Then printing the content of array a: for(var i = 0; i < a.length; i++) { console.log(a[i]); } I execute this using node: #nodejs func.js and got the result a b 1 3

FB.login callback not working on Opera Mobile browser

由 时间秒杀一切 提交于 2020-01-02 17:13:09
问题 I am testing our web application on OPera Mobile. We have a signIn through facebook link. It takes me to the login page, but after I enter my ID and password nothing happens. If I click on the login button mutliple times, it gives me too many failed attempts error. But after this my facebook account seems to be logged in. If I login to facebook and come back to our application and click on login, nothing happens, I see a blank page. After I did Javascript debug, I could see that the FB.login(

How to put result from “AsyncTask doInBackground from different class” to “TextView in MainActivity”

由 守給你的承諾、 提交于 2020-01-02 15:48:46
问题 I am new to android. This question is a phase from my steps in experimenting with android apps and web service. I have asked a question before, which is in here: Fail to connect android to web service. Below is my Updated code, my code in MainActivity: public class MainActivity extends AppCompatActivity { TextView tv; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); tv = (TextView) findViewById(R.id

mongoose学习及案例

由 北战南征 提交于 2020-01-02 15:46:36
文档地址： http://www.mongoosejs.net/docs/guide.html 介绍：Mongoose是在node.js异步环境下对mongodb进行便捷操作的对象模型工具 安装mongoose: $ npm install mongoose 连接数据库 　　 connect() 返回一个状态待定（pending）的连接， 接着我们加上成功提醒和失败警告 例： let mongoose = require('mongoose'); const db = 'mongodb://127.0.0.1/vue_mall_mobile'; // const db = 'mongodb://127.0.0.1/vue_mall_mobile_v2'; // 服务器临时部署数据库 // 导出一个方法 exports.connect = () => { // 连接数据库 mongoose.connect(db); // 记录数据库连接的次数 let maxConnectTimes = 0; return new Promise((resolve, reject) => { // 连接成功操作 mongoose.connection.once('open', () => { console.log('Mongodb 数据库连接成功.'); resolve(); }); //

基于scrapy源码实现的自定义微型异步爬虫框架

由 谁说胖子不能爱 提交于 2020-01-02 13:19:14
一、scrapy原理 Scrapy 使用了 Twisted异步网络库来处理网络通讯。整体架构大致如下 Scrapy主要包括了以下组件： 引擎(Scrapy) 用来处理整个系统的数据流处理, 触发事务(框架核心) 调度器(Scheduler) 用来接受引擎发过来的请求, 压入队列中, 并在引擎再次请求的时候返回. 可以想像成一个URL（抓取网页的网址或者说是链接）的优先队列, 由它来决定下一个要抓取的网址是什么, 同时去除重复的网址 下载器(Downloader) 用于下载网页内容, 并将网页内容返回给蜘蛛(Scrapy下载器是建立在twisted这个高效的异步模型上的) 爬虫(Spiders) 爬虫是主要干活的, 用于从特定的网页中提取自己需要的信息, 即所谓的实体(Item)。用户也可以从中提取出链接,让Scrapy继续抓取下一个页面 项目管道(Pipeline) 负责处理爬虫从网页中抽取的实体，主要的功能是持久化实体、验证实体的有效性、清除不需要的信息。当页面被爬虫解析后，将被发送到项目管道，并经过几个特定的次序处理数据。 下载器中间件(Downloader Middlewares) 位于Scrapy引擎和下载器之间的框架，主要是处理Scrapy引擎与下载器之间的请求及响应。 爬虫中间件(Spider Middlewares) 介于Scrapy引擎和爬虫之间的框架

Using “current_user” in models in Ruby on Rails

由 大城市里の小女人 提交于 2020-01-02 08:54:47
问题 I'm using Devise and it offers "current_user" method in helpers, so that I can use in views and controllers. However now I'd like to access to the "current_user" method in the models. Here's what I have in controllers now. def create set_email_address(params[:email_address]) Comment.new(params[:content], set_email_address) # [snip] end private def set_email_address(param_email) if current_user @email_address = current_user.email else @email_address = param_email end end I would like to move

Passing additional arguments to gtk function

由 坚强是说给别人听的谎言 提交于 2020-01-02 08:43:21
问题 I'm trying to learn how to make GUIs using gtk+ 3.0. I want to pass a simple argument, an integer, to a callback function, so that when I press the button the value of the argument changes. Here's my code: #include <gtk/gtk.h> void buttonFunction(GtkWidget * widget, gpointer data, int & n){ n = 1; } int main(int argc, char ** argv){ int n = 0; GtkWidget * window; GtkWidget * button; gtk_init(&argc,&argv); window = gtk_window_new(GTK_WINDOW_TOPLEVEL); button = gtk_button_new_with_label("Osss")

Passing additional arguments to gtk function

由 情到浓时终转凉″ 提交于 2020-01-02 08:43:07
问题 I'm trying to learn how to make GUIs using gtk+ 3.0. I want to pass a simple argument, an integer, to a callback function, so that when I press the button the value of the argument changes. Here's my code: #include <gtk/gtk.h> void buttonFunction(GtkWidget * widget, gpointer data, int & n){ n = 1; } int main(int argc, char ** argv){ int n = 0; GtkWidget * window; GtkWidget * button; gtk_init(&argc,&argv); window = gtk_window_new(GTK_WINDOW_TOPLEVEL); button = gtk_button_new_with_label("Osss")

Using threading lock in ctypes callback function

由 徘徊边缘 提交于 2020-01-02 08:05:23
问题 I want to use a ctypes dll from a twisted application. Minimal example concocted here: from ctypes import * from threading import Lock lock = Lock() dll = windll.LoadLibrary('mydll.dll') l = [1,2,3] def callback(): lock.acquire() l.pop() lock.release() return 0 C_CALLBACK = CFUNCTYPE(c_int) c_callback = C_CALLBACK(callback) # this is a non blocking function call starts a hardware task that fires a callback upon completion dll.registerCallback(c_callback) while(True): # in reality this block

Using threading lock in ctypes callback function

由 ℡╲_俬逩灬. 提交于 2020-01-02 08:05:10
问题 I want to use a ctypes dll from a twisted application. Minimal example concocted here: from ctypes import * from threading import Lock lock = Lock() dll = windll.LoadLibrary('mydll.dll') l = [1,2,3] def callback(): lock.acquire() l.pop() lock.release() return 0 C_CALLBACK = CFUNCTYPE(c_int) c_callback = C_CALLBACK(callback) # this is a non blocking function call starts a hardware task that fires a callback upon completion dll.registerCallback(c_callback) while(True): # in reality this block
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