async-await

问题 This question already has answers here : How do I return the response from an asynchronous call? (36 answers) Closed 12 months ago . I want to use my fetched values in another function I'm really new to JS. So until now I tried this.setState() and a return value of the function . async fetchData() { const url = 'http://localhost:8080'; const response = await fetch(url); const data = await response.json(); // stringify JSON var myJSON = JSON.stringify(data); // parsing to JS object var

问题 Like below link, is there java function that thread interrupt asynchronous queue and put in alertable? https://docs.microsoft.com/en-us/windows/desktop/sync/using-a-waitable-timer-with-an-asynchronous-procedure-call I want to make async timer function in java. I checked it works in c++. But I don't know if it is in java. When main thread run and check periodically if there are the async timer fired and run it and going back and run again. That is what i want to do. Of course, when checking

问题 I have a javascript file that I need to read. I managed to read it as a String using FileReader, but I want to read the object that is exported in that file. This is how my file looks: const carsColor = { audi: 'blue', bmw: 'black', }; export default carsColor; Read it as a String: loadFile = async () => { try { const response = await fetch(PATH_TO_FILE); const blob = await response.blob(); let read = new FileReader(); read.onload = function() { console.log(read.result); // read.result

问题 I'm currently developing a Xamarin app that communicates via a Wi-Fi connection with some custom hardware containing a sensor. The job of my app is to retrieve the sensor data from the hardware and display it with oxyplot as a continuous stream of 1-D data. Unfortunately, I noticed that the performance of my app usually degrades over time and at some point it always crashes. The exact crashing time is quite arbitrary but seems to depend on the amount of sensor data (i.e. larger amplitude

问题 Expected result : TestAsync is called by UI thread and a worker thread executes LongTask . Actual result : Ui thread executes everything Test : public override View OnCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { // [...] _fab = root.FindViewById<FloatingActionButton>(...); _fab.Click += ((sender, v) => TestAsync("fab")); // [...] } private async void TestAsync(string origin) { await LongTask(); } private async Task LongTask() { while (true) { } //

问题 I have tried the following code in Python 3.6 for asyncio: Example 1: import asyncio import time async def hello(): print('hello') await asyncio.sleep(1) print('hello again') tasks=[hello(),hello()] loop=asyncio.get_event_loop() loop.run_until_complete(asyncio.wait(tasks)) Output is as expected: hello hello hello again hello again Then I want to change the asyncio.sleep into another def: async def sleep(): time.sleep(1) async def hello(): print('hello') await sleep() print('hello again')

问题 I'm using the following code to write a HTTP server to check if using async/await can impact the performance const http = require('http') const server = http.createServer(reqResHandler); server.listen(3000, err => { if (err) throw err console.log('Server listening on: http://localost:3000') }) Without Promise const reqResHandler = (req, res) => { req.body = []; req.on('data', (chunk)=>req.body.push(chunk)); req.on('end', ()=>{ req.body = Buffer.concat(req.body); res.setHeader("content-length"

问题 I know I'm missing something stupid, the "StartProcess" Method is making the UI unresponsive and no amount of googling and tutorials has led me to an answer. Here is my code: public MainWindow() { InitializeComponent(); txtBlock.Text = "Testing"; Initialize(); } public void Initialize() { uiScheduler = TaskScheduler.FromCurrentSynchronizationContext(); StartProcess(); } async void StartProcess() { Task<int> result = Task.Factory.StartNew(() => { txtBlock.Text += ("\n starting updater"); while

问题 How to set/ define the const files? Have tried placing the path and CSV file location in () but does not return value. const searchkeywords = readKeyWords('./datain/testdata.csv','utf-8'); // database function readKeyWords(path) { return fs.readFileSync(path, 'utf-8') .split('\n'); } async function printFiles () { const files = await getFilePaths(); for (const file of files) { const contents = await fs.readFile(file, 'utf8'); console.log(contents); } } Hoping to achieve sequential iteration,

问题 I am looping over an array to update its values using returned value from called function which internally calls an asynchronous function . I need to handle asynchronous function in synchronous way which is not being directly called. This is replication of scenario . function condition(){ // Code of this function is not accessible to me. return new Promise(function(resolve, reject){ setTimeout(function(){ if(parseInt(Math.random() * 100) % 2){ resolve(true); } else{ reject(false) } }, 1000) }