progress

This code snippet is from Stephen Cleary's blog and gives an example of how to report progress when using Task.Run. I would like to know why there are no cross thread issues with updating the UI, by which I mean why is invoke not required? private async void button2_Click(object sender, EventArgs e) { var progressHandler = new Progress<string>(value => { label2.Text = value; }); var progress = progressHandler as IProgress<string>; await Task.Run(() => { for (int i = 0; i != 100; ++i) { if (progress != null) progress.Report("Stage " + i); Thread.Sleep(100); } }); label2.Text = "Completed."; }

As suggested here: https://gist.github.com/HenrikJoreteg/2502497 , I'm trying to add onprogress functionality to my jQuery.ajax() file upload. The upload works fine, and the onprogress event is firing, but not as I expected--instead of firing repeatedly at some time interval, it's firing only once, when the upload has completed. Is there a way to specify the frequency of onprogress refreshes? Or, am I trying to do something that can't be done? Here's my code: $.ajax( { async: true, contentType: file.type, data: file, dataType: 'xml', processData: false, success: function(xml) { // Do stuff

I am developing an Android app which enables the user to upload a file to services like Twitpic and others. The POST upload is done without any external libraries and works just fine. My only problem is, that I can't grab any progress because all the uploading is done when I receive the response, not while writing the bytes into the outputstream. Here is what I do: URL url = new URL(urlString); HttpURLConnection conn = (HttpURLConnection) url.openConnection(); conn.setDoInput(true); conn.setDoOutput(true); conn.setUseCaches(false); conn.setRequestMethod("POST"); conn.setRequestProperty(

I've got the following code for a file upload with Apache's HTTP-Client (org.apache.http.client): public static void main(String[] args) throws Exception { String fileName = "test.avi"; File file = new File(fileName); String serverResponse = null; HttpParams params = new BasicHttpParams(); params.setParameter(HttpProtocolParams.USE_EXPECT_CONTINUE, true); HttpProtocolParams.setVersion(params, HttpVersion.HTTP_1_1); HttpClient client = new DefaultHttpClient(params); HttpPut put = new HttpPut("http://localhost:8080/" + fileName); FileEntity fileEntity = new FileEntity(file, "binary/octet-stream"

《叶问》是知数堂新设计的互动栏目，不定期给大家提供技术知识小贴士，形式不限，或提问、或讨论均可，并在当天发布答案，让大家轻轻松松利用碎片时间就可以学到最实用的知识点。 2018年8月2日，周四 《全方位认识SYS系统库》公开课精彩互动问答： 1、为什么我用root用户调用call ps_setup_enable_instrument('wait');报错说存储过程不存在？ 答：sys schema是从MySQL 5.7之后才默认支持，请确保你的数据库版本正确，且先使用use语句切换默认数据库，否则请带上 sys.库名称限定前缀。 2、myisam锁如何查询？ 答：MyISAM 不支持事务，所以不存在事务锁，但可以查询表级锁（例如：MDL锁），通常表级锁是Server层添加的锁，与具体的存储引擎无关，所以与InnoDB存储引擎查询方法一致，建议多多尝试即可得出答案。 3、为什么我查询session系统表，当前正在执行SQL的会话的progress为 NULL 呢？ 答：对于progress信息，仅支持stages事件（performance_schema.setup_instruments表的name字段以stages开头的采集项），其他事件类型不支持，且就算是stages类型事件，也不是所有的采集项都支持，可以通过观察performance_schema.events_stages

I havent got a clue to how to do this. My progress bar should be the shape of cloud. Can someone direct me to a book, tutorial or just give the right step by step method? Thank you for your time. As shown here you can use image views to get custom scroll bar like effect. The layout XML for custom progress bar in that example is: <RelativeLayout android:id="@+id/RelativeLayout01" android:layout_width="fill_parent" xmlns:android="http://schemas.android.com/apk/res/android" android:gravity="center" android:layout_height="wrap_content" android:paddingLeft="30sp" android:paddingRight="30sp">