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问题 I am not able to understand the purpose of piped i/o streams in java. If I write something using an outputstream, I can anyways read it again using an inputstream. So what is the need of a pipedstream? 回答1: Short motivation: Separation of concerns (always good - in this case it helps split your code into reading and writing part) Multithreading (previous point lead to "easy" (its never easy :D) parallelization) Long explanation/example: Imagine you have "producer-consumer" like application.

问题 Please I need help. I've got a problem when trying to find accented words in a text (in Spanish). I have to search in a large text the first paragraph starting with the words 'Nombre vernáculo' For example, the text is like: "Nombre vernáculo registrado en la zona de ..." But accented words are not recoginzed by my python script. I've tryed with: re.compile('/(?<!\p{L})(vern[áa]culo*)(?!\p{L})/') re.compile(r'Nombre vern[a\xc3\xa1]culo\.', re.UNICODE) re.compile ('[A-Z][a-záéíóúñ]+') \p{Lu}]

问题 I made a program which make a HUD over a video, getting info from sensors and plotting the results on the video frames, refreshing every frame, and for representing degrees (inclination) I need to plot a degree symbol, but what I get it's 2 symbols ("??") in the video show. I search through this site and others too. I can't do it!!!! please, I don't know what to do, it's just that little thing that I can't do it. This is the beginning of my program: import cv2 from random import * import

问题 I have a viewset with one of the views as: @list_route(methods=["get"], url_path="special") def special(): pass And I call this view from another view like: view_fn = viewset.as_view({'get': 'list'}) response = view_fn(request) But it does not call my special function which maps to "/special/" , instead it calls the function which maps to "/" . I guess I need to pass url_path somehow or get the view using view name ? However, I'm not sure how to do either. 回答1: This will not work because you

问题 I'm trying to make Arduino projects with eclipse IDE and I have followed this video tutorial and I am getting this error: Building ArduinoTest make: *** No rule to make target 'Ulloa/.arduinocdt/packages/arduino/hardware/avr/1.6.19/cores/arduino/abi.cpp', needed by 'core/abi.cpp.o'. Stop. I'm new with this and I don't know what I could be doing wrong. This is my makefile, it's the one that was generated by Eclipse: ifeq ($(OS),Windows_NT) SHELL = $(ComSpec) RMDIR = rmdir /s /q RM = del /q

问题 How can i display different labels under each column and also have another label for the entire group? As you can see in the picture below i want to use fontawesome icons for each column but another label for the main group. I found other answers how to use fa icons but don't know how to position them under each bar. The trendlines which connect distinct columns are not so important but would be great if i can find out how to add them also. Also the chart needs to be scrollable as it can hold

问题 I know very little about Flash, and so is not programming in it. I have a website in PHP, and obviously, HTML, CSS, JS, etc. What I want to do is to allow users to full-screen certain pieces of the DOM. So my question is, is there any way to wrap flash around certain portions of the DOM dynamically in order to allow full screening of that portion. Edit: The current responses are very interesting and could be the only options. But in my ideal world there would be an embedded flash object, and

问题 I have created following code Dim ConnectionString As String = ConfigurationManager.ConnectionStrings("default").ConnectionString Dim con As New SqlConnection(ConnectionString) con.Open() Response.Write("Connection Opened<br/>") con.Close() Response.Write("Connection Closed<br/>") in a web application project Target .NET Framework 4.0 but it is giving System.AccessViolationException i cannot understand why. if i change the target Framework to .NET 3.0 then the code runs fine. Below is the

问题 I'm trying to build an android app that will log into a website, scrape the website for data specific to the user, then format that data nicely on a mobile screen. I've noticed that there are several similar questions to my own, and after reading some of the documentation, I am still very confused as to how I should go about this. Here's what I know The site that I want to log into utilizes asp.net and the login.aspx uses POST for the login form. There is no API for this website There is also

问题 I created a route for navigating from one page to another, in the following way class task extends StatelessWidget{ @override Widget build(BuildContext context) { return MaterialApp( title: 'Task', home: new task(), routes: <String, WidgetBuilder>{ "/Completed": (BuildContext context) => new Completed() } ); } } class taskScreen extends StatefulWidget{ @override taskState createState() => new taskState(); } class taskState extends State<taskScreen> { @override Widget build(BuildContext