future

来源： https://stackoverflow.com/questions/61105410/dart-future-wait-for-multiple-futures-and-get-back-results-of-different-types

来源： https://stackoverflow.com/questions/61105410/dart-future-wait-for-multiple-futures-and-get-back-results-of-different-types

来源： https://stackoverflow.com/questions/61105410/dart-future-wait-for-multiple-futures-and-get-back-results-of-different-types

问题 The message below is being printed while setting the result of an asyncio future. Executing <Handle <TaskWakeupMethWrapper object at 0x7fc3435141f8>(<Future finis...ection.py:260>) created at /media/stuff/stuff/projects/dare/dcds/dcds/common/connection.py:221> took 1.723 seconds I have no idea where even to start looking for the cause. But if I turn off the asyncio debug mode it crashes and shows me this. Task was destroyed but it is pending! task: <Task pending coro=<upload.<locals>.upload

问题 I have the following struct struct Test; impl Test { async fn function(&mut self) {} } I want to implement an std::future::Future (well, actually futures::Stream , but it's basically the same) on Test , that would poll the function . My first try looked something like this impl Future for Test { type Output = (); fn poll(self: Pin<&mut self>, cx: &mut Context<'_>) -> Poll<Self::Output> { match self.function() { Poll::Pending => Poll::Pending, Poll::Ready(_) => Poll::Ready(()), } } } Obviously

问题 I have the following struct struct Test; impl Test { async fn function(&mut self) {} } I want to implement an std::future::Future (well, actually futures::Stream , but it's basically the same) on Test , that would poll the function . My first try looked something like this impl Future for Test { type Output = (); fn poll(self: Pin<&mut self>, cx: &mut Context<'_>) -> Poll<Self::Output> { match self.function() { Poll::Pending => Poll::Pending, Poll::Ready(_) => Poll::Ready(()), } } } Obviously

问题 I'm trying to build my first mobile application with flutter and firebase. When I try to display and store a photo I have the following issue : error: The argument type 'Future' can't be assigned to the parameter type 'File'. (argument_type_not_assignable at [whereassistant] lib/main.dart:85) I should probably do some casting but I don't understand hox to do it properly. Here's my Future file declaration : Future<File> _imageFile; I'm taking a Photo which is displayed on screen : setState(()

问题 I get the following error: A value of type 'Future<int>' can't be assigned to a variable of type 'int' It might be another type instead of int , but basically the pattern is A value of type 'Future<T>' can't be assigned to a variable of type 'T' So... What exactly is a Future ? How do I get the actual value I want to get? What widget do I use to display my value when all I have is a Future<T> ? 回答1: In case you are familiar with Task<T> or Promise<T> and the async / await pattern, then you

问题 Thank you to anyone who can help. I'm trying to use PHP to get a delivery date that is X days from any given current day. This is to use with the Google Survey Opt-in code and WooCommerce in WordPress. Referencing this thread: WooCommerce fill-in fields for Google Survey Opt-In Code Google wants dynamic values, explained here: https://support.google.com/merchants/answer/7106244?hl=en&ref_topic=7105160#example I have most of the code ready to go, but this dynamic date has been hard to figure

问题 I am using a plugin for flutter called search_widget . The data parameter of this widget takes a list. But as I use sqlite for fetching data, I have it in Future<List> form. Is there any way I can convert Future<List> to List ? Or any other way to get this working. 回答1: Borrowing the example from search_widget you need dataList in a widget like this: SearchWidget<LeaderBoard>( dataList: list, textFieldBuilder: (TextEditingController controller, FocusNode focusNode) { return MyTextField