callback | 易学教程

Threading with Callback example does not work.

阅读更多关于 Threading with Callback example does not work.

问题 I am working on this example, but I am unable to mesh the callback and the threading. What I want is this. 1) Press button 2) Start the progress bar running 3) Call to a new thread to perform some long running process 4) A callback on the long running process should trigger the progress bar to stop. Below I have something...Although the callback parameter for DoSomethingInThread comes in as null. The StopProgressBar() acts on the ProgressBar control, so it cannot be static. static bool done;

深入解析OkHttp3

阅读更多关于深入解析OkHttp3

OkHttp是一个精巧的网络请求库，有如下特性:  1)支持http2，对一台机器的所有请求共享同一个socket  2)内置连接池，支持连接复用，减少延迟  3)支持透明的gzip压缩响应体  4)通过缓存避免重复的请求  5)请求失败时自动重试主机的其他ip，自动重定向  6)好用的API 其本身就是一个很强大的库，再加上Retrofit2、Picasso的这一套组合拳，使其愈发的受到开发者的关注。本篇博客，我将对Okhttp3进行分析（源码基于Okhttp3.4）。如何引入Okhttp3？配置Okhttp3非常简单，只需要在Android Studio 的gradle进行如下的配置： compile 'com.squareup.okhttp3:okhttp:3.4.1' * 1 添加网络权限： <uses-permission android:name="android.permission.INTERNET"/> * 1 Okhttp3的基本使用 okHttp的get请求  okHttp的一般使用如下，okHttp默认使用的就是get请求 String url = "http://write.blog.csdn.net/postlist/0/0/enabled/1"; mHttpClient = new OkHttpClient(); Request request =

ajax调用webservice 跨域问题

阅读更多关于 ajax调用webservice 跨域问题

用js或者jquery跨域调用接口时对方的接口需要做jsonp处理，你的ajax jsonp调用才可以 egg 接口中已经做了jsonp处理,所以可以跨域调用 //$.ajax({ // url: "http://api.k780.com:88/?app=weather.today&weaid=1&appkey=10003&sign=b59bc3ef6191eb9f747dd4e83c99f2a4&format=json&jsoncallback=?", // dataType: "jsonp", // type: "Post", // jsonpCallback: "jsonpCallback", // success: function (data) { // var $ul = $("<ul></ul>"); // $.each(data, function (i, v) { // alert(i); // //if (i=="success") { // //} else { // // $("#dvWeather").html("weaid:" + v.weaid + "<br/>" + "days:" + v.days + "<br/>" + "week:" + v.week + "<br/>" + "cityno:" + v.cityno + "<br/>" +

find_or_create race conditions

阅读更多关于 find_or_create race conditions

问题 I'm trying to use ActiveRecord's find_or_create_by_*column* , but I'm getting errors from Postgres letting me know that it occasionally fails to find the model, and tries to insert one anyways. It's really important that I keep this table unique, so I added a :unique => true attribute to its migration, so that Postgres would know that I was serious about it. And, fail: ActiveRecord::StatementInvalid: PGError: ERROR: duplicate key value violates unique constraint "index_marketo_leads_on_person

find_or_create race conditions

阅读更多关于 find_or_create race conditions

NB与stm32通信

阅读更多关于 NB与stm32通信

##用NB-IOT上的stm32单片机通过UART和USART串口与电脑通信 ###串口通信流程下收发数据流程：中断触发—>进入中断服务函数—>根据中断服务函数中的状态(中断向量表)运行相对应的函数—>执行回调(callback)函数 [有关callback函数的定义请参见《windows环境下32位汇编》.作者罗云彬.第二章.windows环境下消息处理队列] ###函数解释： USART2_IRQ_HANDLER(void);//中断服务函数，主要工作是判断标志位，判断接收的数据是否是错误的，如果是错的就进入对应的回调函数，如果没错的话就进入static void UART_RxlSR_8BIT(UART_HandleTypeDef *huart2); static void UART_RxlSR_8BIT(UART_HandleTypeDef *huart2);//隶属于接收使能函数，这个函数就是在流程中提到的中断服务函数相对应的函数 HAL_UART_RECEIVE_IT(UART_HandleTypeDef *huart2,uint8_t *pData,uint16_t Size); /*接收使能函数，如果通信过程中收到数据想要保存，必须运行接收使能函数。我在调试过程中，因为没有加这个函数，所以一直收不到32发来的数据。参数解释：*huart2指串口2的句柄。

Python bokeh CustomJS callback update DataTable widget

阅读更多关于 Python bokeh CustomJS callback update DataTable widget

问题 How can I update the values of my DataTable widget using Select widget? Here is my sample code: import pandas as pd from bokeh.io import show from bokeh.layout import column from bokeh.models import ColumnDataSource, CustomJS, Select from bokeh.models.widgets import DataTable, TableColumn df = pd.DataFrame({'a': range(10,50), 'b': range(110,150)}) source_foo = ColumnDataSource(data=df.loc[df['a'] < 25]) source_bar = ColumnDataSource(data=df.loc[df['a'] > 25]) source_fill = ColumnDataSource

A Callback to $.each()'s Callback? [closed]

阅读更多关于 A Callback to $.each()'s Callback? [closed]

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 10 years ago . Update: The code below does indeed work as expected, and accomplishes the code I wanted. My confusion was in understanding what I had in my markup when writing the code below - after giving my markup a second look, I realized my code worked perfectly. I've provided my answer below for all who are interested in

How would I create a callback around an XML request?

阅读更多关于 How would I create a callback around an XML request?

问题 I've been trying to understand how callbacks work in Swift. I've gone over quite a few examples (like this one) that have helped me to better understand callbacks, but I haven't had any luck in properly implementing one. I have a function that accepts a URL, downloads some XML data from a web api and then parses it into objects. At the same time I have a UILabel that is waiting for some data from the XML request. Below is a partial example of my function that I'd like to set up with a

How would I create a callback around an XML request?

阅读更多关于 How would I create a callback around an XML request?