handler

SetConsoleCtrlHandler does not get called on shutdown

由 試著忘記壹切 提交于 2021-02-19 02:22:55
问题 I wrote an application that runs in a console and needs to do a quick backup before the system shuts down or the user logs out. My test application writes a file with the signal and works when the console window is closed by hand (click on the X). But it does not work when the console is closed on shutdown or logout. From what I have read on MSDN, this should work. The program was compiled using cygwin64, could this be the problem? #include <windows.h> #include <stdio.h> #include <stdlib.h>

How to stop Handler in Android

由 随声附和 提交于 2021-02-17 21:32:55
问题 In my application I have created a calendar with Gridview and in that Gridview I am displaying dates and some availability of events with the help of Imageview and to do this I have created a handler. Now I want to stop the handler. MainActivity.java // inside oncreate Handler handler = new Handler(); refreshCalendar(); // outside oncreate public void refreshCalendar() { calAdapter.refreshDays(); calAdapter.notifyDataSetChanged(); handler.post(calendarUpdater); calTitle.setText(android.text

android Handler机制详解

由 心不动则不痛 提交于 2021-02-16 13:07:25
一、几个相关概念简述： 1、MessageQueue： 消息队列，存放消息的容器。 注意 ：每一个线程最多只有一个MessageQueue，创建一个线程的时候，并不会自动创建其MessageQueue。通常使用一个Looper对象对该线程的MessageQueue进行管理。主线程创建时，会创建一 个默认的Looper对象，而Looper对象的创建，将自动创建一个MessageQueue。其他非主线程，不会自动创建Looper，要需要的时候，通过调用prepare函数来实现。 2、Message：消息对象，存储与MessageQueue中，一个MessageQueue包含多个Message对象，这些Message对象遵循先进先出的原则。 注意 ：通常会new一个message实例对象，或者通过Handler对象的obtainMessage()获取一个Message实例，使用removeMessages()方法可以将消息从队列中删除； 3、Looper：消息封装的载体，是MessageQueue的管理者。每一个MessageQueue都不能脱离Looper而存在，Looper对象的创建是通过prepare函数来实现的。同时每一个Looper对象和一个线程关联。通过调用Looper.myLooper()可以获得当前线程的Looper对象。 注意： 创建一个Looper对象时

Why does Looper.loop() not block the UI thread

由 不想你离开。 提交于 2021-02-10 14:29:10
问题 This is the code in ActivityThread.main(): public static void main(String[] args) { ...... Looper.prepareMainLooper(); ... Looper.loop(); throw new RuntimeException("Main thread loop unexpectedly exited"); } It made the Looper running. There is a loop running in the Looper.loop() all the time. Why does Looper.loop() not block the UI thread? 回答1: Looper.loop() prepares the Looper to run the messages that are passed to the thread. It doesn't blindly keep iterating over itself, rather it uses a

Why does Looper.loop() not block the UI thread

由 白昼怎懂夜的黑 提交于 2021-02-10 14:28:51
问题 This is the code in ActivityThread.main(): public static void main(String[] args) { ...... Looper.prepareMainLooper(); ... Looper.loop(); throw new RuntimeException("Main thread loop unexpectedly exited"); } It made the Looper running. There is a loop running in the Looper.loop() all the time. Why does Looper.loop() not block the UI thread? 回答1: Looper.loop() prepares the Looper to run the messages that are passed to the thread. It doesn't blindly keep iterating over itself, rather it uses a

reCaptcha values not appearing in $_POST

由 随声附和 提交于 2021-02-08 21:49:52
问题 I am trying to use reCaptcha on my site, and recaptcha_challenge_field, and recaptcha_response_field are not being added to the $_POST array on the backend - but the rest of the variables from my form are. Any ideas? I have double checked the public/private keys. Here is the generated HTML: <form action='myform.php' name='myform' id='myform' method='post' enctype='multipart/form-data'> <tr class='select'> <td class='label'>Name:</td> <td> <input type='text' name='name' id='name' class=

WriteHandler from boost::asio::async_write doesn't work properly when connection is dropped (firewall / manual disconecting the network)

由 穿精又带淫゛_ 提交于 2021-02-05 08:14:09
问题 I've been trying to write a client-server application using boost::asio, overall the application works great but I've stumbled over a problem regarding the data provided by 'WriteHandler' ( async_write function) when the connoction (between client <> server) is droped by a firewalll or by manualy disabling a newtwork card. Here is the code snippet: void write(const CommunicatorMessage & msg, std::function<void(bool)> writeCallback) { io_service.dispatch( [this, msg, writeCallback]() { boost:

WPF C# adding event handler programmatically

由 无人久伴 提交于 2021-01-28 23:11:08
问题 In my code I create an array of TextBoxes : namespace TCalc { public partial class MainWindow : Window { public TextBox[] pubAltArray; public MainWindow() { InitializeComponent(); pubAltArray = new TextBox[10]; Then I create the TextBoxes programmatically using the following code : private void generatePublishedTxtBox() { for (int i = 0; i < 10; i++) { TextBox pubAlt = new TextBox(); grid_profile.Children.Add(pubAlt); pubAlt.SetValue(Grid.RowProperty, 1); ... pubAltArray[i] = pubAlt; } } Than

WPF C# adding event handler programmatically

由 拥有回忆 提交于 2021-01-28 22:50:48
问题 In my code I create an array of TextBoxes : namespace TCalc { public partial class MainWindow : Window { public TextBox[] pubAltArray; public MainWindow() { InitializeComponent(); pubAltArray = new TextBox[10]; Then I create the TextBoxes programmatically using the following code : private void generatePublishedTxtBox() { for (int i = 0; i < 10; i++) { TextBox pubAlt = new TextBox(); grid_profile.Children.Add(pubAlt); pubAlt.SetValue(Grid.RowProperty, 1); ... pubAltArray[i] = pubAlt; } } Than

Changing image on Android thread

由 江枫思渺然 提交于 2021-01-28 10:07:41
问题 I've gone through stackoverflow and all the similar answers - but have found them not of use. Can anyone please point out why this is not working? It should be simple: update the image every 6 seconds (will be every 3 mins but for testing I've put it as 6 seconds). What the code does is - goes through each of the 4 images step by step but does not change the image. HOWEVER when it gets to the last image - it does change it(??). Questions: What's wrong with this? Why would it only update the
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