instance

问题 the [Powershell]::create() - method creates a new PowerShell-"Instance" either in the "current or a new runspace". Can someone explain how the terms process , instance , runspace and (maybe thread ) relate to each other in this regard. In laymen's terms if possible? 回答1: You can think of [Powershell]::Create() as a new powershell session on the separate thread. This session will have some default runspace created but you can change it to another one. Unlike Start-Process (separate process)

问题 Is it possible to compile movieclips to swc with the instance name as property name? This happends when I add a dynamic text field, but i would like this also on some UI elements. 回答1: Tick the "Export for ActionScript" box in the symbol properties and give it a class name. That will make it show up in the swc. So if you have a Car clip containing a Driver clip you will need to check "Export for actionscript" on both these clips. If you then give the Driver clip an instance name it will show

问题 Using VB.NET, trying to write a page title to a text file. I am stumped here: Private Sub Dim pagetitle As String pagetitle = WebBrowser1.Document.Title My.Computer.FileSystem.WriteAllText("page title.txt", pagetitle, False) But I get an error saying "Object reference not set to an instance of an object." Please help! 回答1: Most likely you are trying to access the Document property when it is still equal to Nothing . Move your code to the DocumentCompleted event of the WebBrowser control, as

问题 I am working on an Asteroid game made in Haskell with Graphics.gloss. Now I have defined a datatype for the asteroids like this: data Asteroid = Asteroid { asteroidPos:: Point, asteroidVel :: Vector, asteroidSize :: Float } So that it has a Position defined by a point, a velocity defined by a vector and it's size. Now I want to know how I could write an instance of Random for this datatype so that a new asteroid appears at a random time, on a random place with a random velocity. Does anyone

问题 From my MainProject (Java 8) i starts a JavaFX 8 Class. public void startFX() { if (isRestartPrintModul() == true) { fxMain.init(); } else { setRestartPrintModul(true); fxMain.main(new String[] {"ohne"}); } } This is my FXMain: package quality; import javafx.application.Application; import javafx.application.Platform; import javafx.event.ActionEvent; import javafx.scene.Scene; import javafx.scene.control.Button; import javafx.scene.layout.StackPane; import javafx.stage.Modality; import javafx

问题 From my MainProject (Java 8) i starts a JavaFX 8 Class. public void startFX() { if (isRestartPrintModul() == true) { fxMain.init(); } else { setRestartPrintModul(true); fxMain.main(new String[] {"ohne"}); } } This is my FXMain: package quality; import javafx.application.Application; import javafx.application.Platform; import javafx.event.ActionEvent; import javafx.scene.Scene; import javafx.scene.control.Button; import javafx.scene.layout.StackPane; import javafx.stage.Modality; import javafx

问题 Sorry about my poor English. The title may not explain what I mean. In Data.Tree, Tree is defined as following: -- | Multi-way trees, also known as /rose trees/. data Tree a = Node { rootLabel :: a, -- ^ label value subForest :: Forest a -- ^ zero or more child trees } #ifdef __GLASGOW_HASKELL__ deriving (Eq, Read, Show, Data) #else deriving (Eq, Read, Show) #endif It uses deriving to instance == and /= for Tree (date). Could I do the same thing without deriving? I try things like this: data

问题 Sorry about my poor English. The title may not explain what I mean. In Data.Tree, Tree is defined as following: -- | Multi-way trees, also known as /rose trees/. data Tree a = Node { rootLabel :: a, -- ^ label value subForest :: Forest a -- ^ zero or more child trees } #ifdef __GLASGOW_HASKELL__ deriving (Eq, Read, Show, Data) #else deriving (Eq, Read, Show) #endif It uses deriving to instance == and /= for Tree (date). Could I do the same thing without deriving? I try things like this: data

问题 Basically I would like to know why a static method cannot be shadowed by an instance method, (I know why, it will lead to ambiguity in certain circumstances), whereas a static variable can be shadowed by an instance variable (it applies only for subclasses). Example: public class Apartment{ static int area = 10; public static int getArea(){ return area; } } class BedroomFlat extends Apartment { int area = 10;// no problem at all public int getArea(){ // illegal line it cannot hide the super

问题 I've been struggling for the last couple of days with the login part of my web app. I've gotten to the point where I can succesfully authenticate a user using the JDBCRealm on tomcat(by reading users from a sql server database). Now I want to send some kind of feedback when the user's account has been blocked, or when the credentials are incorrect, this is where I'm stuck now. I wanted to use this: try { request.login(request.getParameter("user"), request.getParameter("pass")); } catch