synchronous

问题 In writing my Xamarin-based cross-platform C# app, a situation I encounter fairly often is code that is synchronous on one platform but async on another. For example, file access is synchronous on iOS, Android, and Mac, but async on Windows. This leads to some tricky issues. First of all, on a pure coding level, the compiler wants a method to be either async or not. But it's worse than that. For example, if the iOS UI thread discovers that it needs to load a small file, and does so,

问题 Why don't return that function the responseText? function LoadBookmarksAsXml() { return $.ajax( { type: 'GET', async: false, url: 'http://www.google.com/bookmarks/?output=xml&num=10000' }).responseText; } (It works if I define a success-callback-function and set async to true!) Thanks in advance!! Edit : Don't worry about the cross-domain call; user603003 says (in a comment on a now-deleted answer) that this is in a Chrome extension where cross-domain requests are allowed. The solution if

问题 I am working on an android application which reads data from a BLE device. I came across plenty of solutions here on how to read multiple characteristics and most of them suggested Queues. I did implement the Queue method and everything is working fine in my code as expected. The reason why i started this thread is to find the best possible and most efficient solution and also to clear some of my doubts regarding how certain BLE service characteristics work. I have taken the below two links

问题 Want a player (easy enough to put up) that plays back a directory of mp3s in such a way that if you join at 3:33:33 pm, you hear what others hear, not track one. like a pseudo broadcast/stream. how do i achieve that - what looks nice / is probably minimizable / is easy? i am trying to use mirvling but no such luck. any ideas? 回答1: It's unlikely you're going to find something to drop in place. Plus, this isn't typically handled on the client side of things. You neglected to specify what

问题 What's the proper way to do a synchronous QNetworkAccessManager::get ? The qt wiki offers an approach, but states "it is not recommended to use this in real applications." The mailinglist offers a similar solution to the wiki. 回答1: Yum may use something like this: QEventLoop loop; connect(_netReply, SIGNAL(finished()), &loop, SLOT(quit())); loop.exec(); 回答2: The simple solution mentioned in the wiki and in the answer from yttrium is quite fragile since it doesn't handle all possible failure

问题 I have a MDB which listens to WebSphere MQ. It does not picks up the messages in the order that has been received by the Queue. How can i make it read it in that order? Is it possible? Should i not use a MDB. 回答1: In general, WMQ delivers messages in the order that they were received. However, several things can impact that... If the queue is set to priority instead of FIFO delivery and messages arrive in different priorities, they will be delivered "out of order". Distinguish between order

问题 I have noticed what could be a big problem though for openSync, that when you open a file with openSync, you don't get the file descriptor. You only get it as an argument to the callback if you open with the asynchronous call. The problem is that you HAVE to have the file descriptor to close the file! There are other things which a programmer might want to do to a file that you need the file descriptor for as well. It would seem a significant omission in the fs API for node.js not to provide

问题 I have a pageTest.html in local folder,this page call a service.ashx?i=...(that return value param passed incremented +1) with follow Ajax code: . . getIncr: function(parameters, success){ $.ajax({ async: false, type: methodType, url: getTarget, data: "n="+parameters, dataType:"jsonp", success: success }); } . . The html page call this function for m time (with script..): . var start = function(){ . . var val = 0; . . for(i=0; i<m; i++) { Foo.getIncr(val, function(returned_n){ val = returned

问题 I have this code below, which is supposed to return the result of the call. I need to do this synchronously so that I know everything is good, however it doesn't seem to work. What am I doing wrong? /* jQuery library: * http://code.jquery.com/jquery-1.9.1.min.js */ function getJSON(url){ var result; $.getJSON(url, { async: false, success: function(data) { result = data; alert(data); // **Edit**: also undefined }}); alert(result); // undefined return result; } 回答1: getJSON does not honor async

问题 I have a third party library containing a class which performs a function asynchronously. The class inherits from the Form. The function basically performs a calculation based on data stored in a database. Once it has finished, it calls a _Complete event in the calling form. What I would like to do is call the function synchronously but from a non-windows form application. The problem is, no matter what I do, my application blocks and the _Complete event handler never fires. From a windows