runtime | 易学教程

shell script load jar files and hang

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问题 Good day, I have a shell script, which will load some jar files first before proceed to do its job. The following is part of my shell script code to load jar files: for f in `find $BASEDIR/lib -type f -name "*.jar"` do CLASSPATH=$CLASSPATH:$f echo Getting jar file : $f... >> $LOG done This is working fine when I trigger this through Crontab , I set a time in crontab and let it trigger automatically, and its work without any error. However, I having some problem when I trigger this shell

How to figure out the cpu usage of a java-process in java

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问题 i've been searching the web for a possibility in java to figure out, how much cpu my application needs but sadly couldn't find a solution. Most of the people referred to "OperatingSystemMXBean" which works on platforms like linux, but not on windows. My application will run on multiple os but mostly on windows. So is there any way to figure out the cpu usage of a java-application in the same runtime which is platform independend or supports multiple platforms including windows, mac and linux?

Avoid creating output files from XSL files within itself

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问题 Lets say I want to write text outputs from many xmls having following format. And some of these xml files may not have values for the nodes [name , age , school]. <student> <name>Dilruk</name> <age/> <school>abc</school> </student> All these xml files are located in one directory and i traverse them to generate output files per each xml. So basically i am using one xsl file iu am having and trying to generate outputs by considering these xml files of similar format [with different node values

Segmentation fault during runtime of console code in C++

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问题 I'm trying to make a simple console student details display system whereby there are 2 classes, class student(Base class) with member variables for name and registration number and class studentAthlete(Derived class) with sports type string. The code compiles sucessfully but on runtime only asks for student details but does not display the details as would be expected when I call the identify() function. On code blocks, the error might not show but on online compiles such as https://www

Disable/Enable applicationbar Button in runtime with event textchanged (Windows Phone)

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问题 In this part of the code is the event TextChanged to enable the button in te applicationbar. C#: private void Textbox_TextChanged(object sender, EventArgs e) { ApplicationBarIconButton btn_guardar = ApplicationBar.Buttons[0] as applicationBarIconButton; if (!string.IsNullOrEmpty(txt_nom_usuario.Text) && !string.IsNullOrEmpty(txt_edad_usuario.Text) && !string.IsNullOrEmpty(txt_peso_usuario.Text)) { btn_guardar.IsEnabled = true; } else btn_guardar.IsEnabled = false; } XAML: <phone

C# Create delegate of method where parameter types are unknown in runtime

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问题 What I am trying to do is the following (which I necessarily don't know if it's even possible); I know a run time type. I know which method I want to invoke in run time. However, I don't know this in compile time. The GetFunction method won't be able to create a delegate of the given methodInfo since the inparam isn't of type object. Is there a way to create a delegate of a function where I only know a Type and a MethodInfo of the method I wish to delegate? public sealed class Functions {

Scala TypeTag Reflection returning type T

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问题 I currently have this: def stringToOtherType[T: TypeTag](str: String): T = { if (typeOf[T] =:= typeOf[String]) str.asInstanceOf[T] else if (typeOf[T] =:= typeOf[Int]) str.toInt.asInstanceOf[T] else throw new IllegalStateException() I would REALLY like to not have the .asInstanceOf[T] if possible (runtime). Is this possible? Removing the asInstanceOf gives me a type of Any, which makes sense, but since we are using reflection and know for sure that I am returning a value of type T, I don't see

vue-cli脚手架初始化使用runtime-only的原因

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vue-cli脚手架使用 runtime-only 和 runtime + compiler 的两种选择　　runtime-only编译过程：render -> Virtual DOM -> UI 　　runtime + compiler 编译过程： template -> AST(抽象语法树) -> render -> Virtual DOM -> UI 它俩的区别就在于一个有编译过程，一个无编译过程，所以runtme-only的代码量少，体积更小　　脚手架初始化时webpack会安装一些loader和plugin,其中就有vue-loader和vue-template-compiler。vue-loader作用是导入.vue文件，也就是将一些组件导入,而vue-template-compiler的作用是将.vue文件进行编译，从而将它编译成不包含模板。　　所以runtime-compiler和runtime-only使用.vue文件最终编译的都是不带模板的，都可以直接用render函数到虚拟DOM到UI。可能唯一的区别在于，runtime-compiler可以在像main.js这样的文件中直接用对象创建一个组件，然后用render函数或者components注册渲染到UI上，而runtime-only没有编译过程不能这么干，只能用.vue文件组件化开发。来源：

Finding size of images imported at runtime

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问题 I am currently loading images at runtime from directories stored in an XML file, and assigning them to RawImage components via the WWW class. While this is working fine, the image is skewed to fit into the new texture size. I am wondering how to get an image’s original size or aspect ratio so that I can change the size of the image rect to suit. The images to be imported are at varying sizes and therefore the approach used needs to be responsive to the original size of imported images. Any

Can I set a Func<> function with runtime variables to omit passing them as parameters in C#?

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问题 I have a numerical analysis program which for simplicity calculates an algorithm similar to: y = ax^3 + bx^2 + cx + d; I calculate the values of a,b,c,d at runtime and would like to pass the following equivalent as a Func<double, double> . Where I can set a value for X, and get Y. y = 12x^3 + 13x^2 + 14x + 15; Where 12,13,14,15 are the numbers calculated at runtime. I realise this can be done by passing in a double array, like so: Func<double[], double> but I am trying to avoid passing around