exit & return
exit（0）：正常运行程序并退出程序； exit（1）：非正常运行导致退出程序； return（）：返回函数，若在主函数中，则会退出函数并返回一值。 来源： CSDN 作者： fengxuewei123 链接： https://blog.csdn.net/fengxuewei123/article/details/104136854
exit
iOS - detect when application exits
问题 How can I detect when a user exits the application? (hitting the home button) And how can I detect when the relaunch it? (clicking the icon) *I'm not talking about users manually quitting the app by holding the home button and then making the icons wiggle and deleting the app instance from the sub-dock. i'm talking about just temporarily exiting the app buy clicking the home button.. maybe sending a text or whatnot then coming back to the app. Thanks! 回答1: - (void
iOS - detect when application exits
问题 How can I detect when a user exits the application? (hitting the home button) And how can I detect when the relaunch it? (clicking the icon) *I'm not talking about users manually quitting the app by holding the home button and then making the icons wiggle and deleting the app instance from the sub-dock. i'm talking about just temporarily exiting the app buy clicking the home button.. maybe sending a text or whatnot then coming back to the app. Thanks! 回答1: - (void
模块二、shell脚本逻辑结构
七、if结构条件句知识与实践 （一）if条件句单双分支语法 1、单分支 if 条件 then 指令 fi 2、双分支 if 条件 then 指令 else 指令集2 fi （二）if条件句多分支语句 if 条件1 then 指令1 elif 条件2 then 指令2 elif 条件3 then 指令3 else 指令4 fi 实例： 如果不存在目录/backup，则创建。 [root@centos6-kvm3 scripts]# cat 07-01.sh #!/bin/bash path="/backup" [ -d $path ] || mkdir $path -p if [ -d $path ] then : else mkdir $path -p fi if [ !-d $path] then mkdir $path -p fi [root@centos6-kvm3 scripts]# 开发shell脚本判断内存是否充足，如果小于100，提示不足，如果大于100提示充足。 [root@centos6-kvm3 scripts]# cat 07-02.sh #!/bin/bash mem=`free -m | awk 'NR==3{print $NF}'` if [ $mem -lt 100 ] then echo "内存不充足！" else echo "内存充足！" fi
Excel VBA Textbox_Exit Event Handler
问题 At a road block here. Simple user form using three text boxes, one for user id, two to enter serial number using hand scanner. User loads excel file, userform.show loads, user enters id then simple validation to verify numberic number, then focus set on first textbox, user scans barcode to input serial number, again simple validation to ensure numeric and length, same with last textbox, scan serial number, validate first textbox entry matches second textbox entry. Hand scanner is used to
Windows Phone 8: How to show messagebox right before exiting the App if pressed Back key?
问题 I have an app that needs to get user's attention when user exit the app at least once. So I get the code below to show a messagebox. What I don't know is how do I really exit the app if user has read the message? Because it seems the back key event will always come to the call I setup (OnBackKeyPress) Or what is a good way to handle showing a messagebox without messing around overriding BackKey? Because if have another pop up on screen and user pressed back key, it seems I got some exception
Does C# app exit automatically dispose managed resources?
问题 I am fully aware that using statements are the way to handle IDisposables. Please do not repeat this advice in comments. When a C# .NET 4.5 (or higher) application closes, what happens to the IDisposables which were not properly disposed? I know some have a finalizer for disposing unmanaged resources. But let's say I have a console app, with a static Stream variable. Is it disposed when I close the console app? What about a HttpClient? And how do you know in which situations it does and in
GUI关闭窗口System.exit(0) dispose()区别
GUI关闭窗口System.exit(0) dispose()区别 System.exit(0) //退出窗口，但不清除内存； dispose() //退出窗口，清除内存 来源： CSDN 作者： 风云雷动 链接： https://blog.csdn.net/qq_41247335/article/details/104028122
How to undo the effect of “set -e” which makes bash exit immediately if any command fails?
问题 After entering set -e in an interactive bash shell, bash will exit immediately if any command exits with non-zero. How can I undo this effect? 回答1: With set +e . Yeah, it's backward that you enable shell options with set - and disable them with set + . Historical raisins, donchanow. 回答2: It might be unhandy to use set +e / set -e each time you want to override it. I found a simpler solution. Instead of doing it like this: set +e command_that_might_fail_but_we_want_to_ignore_it set -e you can
Make R exit with non-zero status code
问题 I am looking for the R equivalent of linux/POSIX exit(n) which will halt the process with exit code n, signaling to a parent process that an error had occurred. Does R have such a facility? 回答1: It's an argument to quit() . See ?quit . Arguments : status: the (numerical) error status to be returned to the operating system, where relevant. Conventionally ‘0’ indicates successful completion. Details : Some error statuses are used by R itself. The default error handler for non-interactive use