exit

问题 I am using VSTS 2008 + .Net 3.5 + C# to develop Windows Forms application. My confusion is, seems Application.Exit does not force application to terminate? If not, which method should I call to make application terminate? EDIT 1: Normally the main method is like this, how to exit Main function gracefully without calling Environment.Exit? static void Main() { Application.EnableVisualStyles(); Application.SetCompatibleTextRenderingDefault(false); try { Application.Run(new Form1()); } catch

问题 At some point in my application I have done this exit(0) which crashes my app. But I haven\'t figured out what method gets called when this executes. I\'ve put messages in: (void)applicationWillTerminate:(UIApplication *)application (void)applicationDidEnterBackground:(UIApplication *)application But none of this seem to get called! Any idea about what method is called when exit(0) is done? 回答1: From Apple's Human User Guidelines... Don’t Quit Programmatically Never quit an iOS application

问题 I have a user login/registration system that simply uses // execute queries, set cookies, etc. here header(\"Location: \" . getenv(\"HTTP_REFERER\")); I recently read a post about exit(); and die(); and had no idea that I was supposed to be using these. From what I understand, they make it end the PHP? Is that correct? What\'s the best way I can work toward this, simply adding one of these functions directly after ever header(); execution I have? I have AJAX, jQuery reading through my login

问题 How can you have a function or something that will be executed before your program quits? I have a script that will be constantly running in the background, and I need it to save some data to a file before it exits. Is there a standard way of doing this? 回答1: Check out the atexit module: http://docs.python.org/library/atexit.html For example, if I wanted to print a message when my application was terminating: import atexit def exit_handler(): print 'My application is ending!' atexit.register

问题 I have a published application in C#. The problem here is whenever I close the main form by clicking on the red exit button, it closes the form but it doesn\'t close the application. I found this out when I tried shutting down the computer, hopeful that the application I made was running smoothly then I was bombarded by a lot of child windows with which I have put MessageBox Alerts. I tried Application.Exit but it still calls all the child windows and alerts and I don\'t know how to use

问题 In Java, What is the difference with or without System.exit(0) in following code? public class TestExit { public static void main(String[] args) { System.out.println(\"hello world\"); System.exit(0); // is it necessary? And when it must be called? } } The document says: \"This method never returns normally.\" What does it mean? 回答1: System.exit() can be used to run shutdown hooks before the program quits. This is a convenient way to handle shutdown in bigger programs, where all parts of the

问题 In Python, there are two similarly-named functions, exit() and sys.exit() . What\'s the difference and when should I use one over the other? 回答1: exit is a helper for the interactive shell - sys.exit is intended for use in programs. The site module (which is imported automatically during startup, except if the -S command-line option is given) adds several constants to the built-in namespace (e.g. exit ) . They are useful for the interactive interpreter shell and should not be used in programs

问题 What are the differences between die() and exit() functions in PHP? I think both have the same functionality, but I doubt there is something different in both... what is it? 回答1: There's no difference - they are the same. PHP Manual for exit: Note: This language construct is equivalent to die(). PHP Manual for die: This language construct is equivalent to exit(). 回答2: DIFFERENCE IN ORIGIN The difference between die() and exit() in PHP is their origin . exit() is from exit() in C. die() is

问题 Should I use exit() or just return statements in main() ? Personally I favor the return statements because I feel it\'s like reading any other function and the flow control when I\'m reading the code is smooth (in my opinion). And even if I want to refactor the main() function, having return seems like a better choice than exit() . Does exit() do anything special that return doesn\'t? 回答1: Actually, there is a difference, but it's subtle. It has more implications for C++, but the differences

问题 I have a console application that contains quite a lot of threads. There are threads that monitor certain conditions and terminate the program if they are true. This termination can happen at any time. I need an event that can be triggered when the program is closing so that I can cleanup all of the other threads and close all file handles and connections properly. I\'m not sure if there is one already built into the .NET framework, so I\'m asking before I write my own. I was wondering if