winrt-async

来源： https://stackoverflow.com/questions/63336568/bluetooth-le-characteristic-values-only-read-once

来源： https://stackoverflow.com/questions/63336568/bluetooth-le-characteristic-values-only-read-once

问题 I asked a similar question before but the answer there did not satisfy my requirement. Let me explain. I call the following code from a DLL to perform a WinRT operation on Windows 10 from a Windows Store app. The code uses WRL: #include <Windows.Services.Store.h> #include <wrl.h> auto onAppLicCompletedCallback = Callback<Implements<RuntimeClassFlags<ClassicCom>, IAsyncOperationCompletedHandler<StoreAppLicense*>, FtmBase>>( [](IAsyncOperation<StoreAppLicense*>* operation, AsyncStatus status) {

问题 When calling create_task is there a way to ensure that the task doesn't run on the UI thread? I want to be sure I'm not inadvertently calling wait inside a task that somehow managed to execute on the UI thread. 回答1: The create_task function won't spontaneously jump onto the UI thread: if you don't call it from the UI thread it won't execute there. You need to explicitly call the Dispatcher to get back. An apartment aware task (one which returns IAsyncAction or IAsyncOperation) will continue

问题 Related to this question, I am trying to implement a procedure that uses the WinRT API to set the desktop wallpaper. To mimic the await functionality in C#, I am using TTask.Future (link) as outlined here and here. My implementation looks like this: class procedure TUtilityWin.SetWallpaper(AFileName: String); var lStorageFile: IStorageFile; liao_storagefile: IAsyncOperation_1__IStorageFile; lFutureTask: IFuture<IAsyncOperation_1__IStorageFile>; begin //WinRT Implementation if TUserProfile

问题 We have a problem in our Windows 8.1 application (WinRT) that sometimes our saved file gets corrupt. The files have a correct file size, but the file only contains NUL-characters. The file should contain a serialized object as XML. In an attempt to find the issue we do not overwrite the file, we do the following: Serialize the current object to a temp file. Check the content of the temp file Copy the current file (to .timestamp.xml.bak) Move/replace the temp file to the current file Most of

问题 In Windows Store Apps, C++(C# is similar though), doing something like IAsyncAction^ Action = CurrentAppSimulator::ReloadSimulatorAsync(proxyFile); create_task( Action ).then([this]() { }.wait(); results in an unhandled exception. Usually it's Microsoft C++ exception: Concurrency::invalid_operation at memory location 0x0531eb58 And I kind of need for that action to finish to get my In App Purchase information before trying to use it. The weird thing here is that anything else besides

问题 In Windows Store Apps, C++(C# is similar though), doing something like IAsyncAction^ Action = CurrentAppSimulator::ReloadSimulatorAsync(proxyFile); create_task( Action ).then([this]() { }.wait(); results in an unhandled exception. Usually it's Microsoft C++ exception: Concurrency::invalid_operation at memory location 0x0531eb58 And I kind of need for that action to finish to get my In App Purchase information before trying to use it. The weird thing here is that anything else besides

问题 I've a problem with my simple windows store app. I'm connecting to SharePoint and query his REST services to get the information I need. Actually I'd like to create a sort of "SharePoint Browser" so that a user can navigate the List structure of SharePoint browsing with the APP. Actually I get the security token from SharePoint and use it in all the calls without any problem. My call is something like: var bldr = new UriBuilder(_uri.ToString()); bldr.Path += _listDataSvc + (String

问题 As I couldn't find any way to peek for data (read data without consuming the buffer) as asked at How to peek StreamSocket for data in UWP apps I'm now trying to make my own "peek" but still no luck. I don't see how I can read data from StreamSocket in the manner which will let me use timeouts and leave the connection usable in case if timeout elapses. In the end, the problem is as follows. In my, let's say, IMAP client, I get response from a server and if this response is negative, I need to