call | 易学教程

How to pass a value into a system call function in XV6?

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问题 I am attempting to create a simple priority based scheduler in XV6. To do this, I also have to create a system call that will allow a process to set its priority. I have done everything required to create the system call as discussed here and elsewhere: how do i add a system call / utility in xv6 The problem is, I cannot pass any variables when I call the function, or rather, it runs like nothing is wrong but the correct values do not show up inside the function. Extern declaration (syscall.c

How to call a batch file that is one level up from the current directory?

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问题 I'm using a batch file in folder1/folder2/file.bat There is a batch file in parent folder folder1 , that I want to open through file.bat I have tried using: start ..\..\code.bat But this results in an error message, because file couldn't be found. Any ideas? 回答1: You could just: cd.. start Code.bat And that would start code.bat from its own directory 回答2: I want to explain better what should be used with an example as the answers posted up to now work only with current working directory being

How to call a batch file that is one level up from the current directory?

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c# Call a method by memory address

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问题 I am trying to call a function at a specified memory address in c#, here is how I would go about it in C: typedef void _do(int i); auto doActor = (_do*)0xAAAABEEF; doActor(1); How do I replicate this behavior in C# if at all possible? Very new to C# all help is appreciated. More in depth explanation of my situation: I am trying to create a tool that helps me automate certain processes within an executable. I decompiled the assembly of the main API and added my functionality (for the most part

Making python wait until subprocess.call has finished its command

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问题 So this question is following on from this (Read comments aswell as that is the path I took). I just want the first call robocopy to finish executing before moving on to the rest of the code. As I want the second robocopy to just skip all of the files as they have already been copied over. However what is happening is that the rest of the script will run (ie starts the second robocopy) while the first robocopy is copying over the files. Below is the code: call(["start", "cmd", "/K", "RoboCopy

js apply,call,arguments,callee,caller详解

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apply与 call 主要解决一下几个问题: 1.apply和call的区别在哪里 2.什么情况下用apply,什么情况下用call 3.apply的其他巧妙用法（一般在什么情况下可以使用apply） apply:方法能劫持另外一个对象的方法，继承另外一个对象的属性. Function.apply(obj,args)方法能接收两个参数 obj：这个对象将代替Function类里this对象 args：这个是数组，它将作为参数传给Function（args-->arguments） call:和apply的意思一样,只不过是参数列表不一样. Function.call(obj,[param1[,param2[,…[,paramN]]]]) obj：这个对象将代替Function类里this对象 params：这个是一个参数列表 1.apply示例: <script type="text/javascript"> /*定义一个人类*/ function Person(name,age) { this.name=name; this.age=age; } /*定义一个学生类*/ functionStudent(name,age,grade) { Person.apply(this,arguments); this.grade=grade; } //创建一个学生类 var student

JavaScript设计模式之二：this、call和apply

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(本节内容摘自：Javascript设计模式与开发实践一书，作为自己的笔记保存，希望对有需要的朋友有用) this、call和apply在Javascript编程中应用非常广泛，所以，我们必须先了解它们。一、this Javascript中的this总是指向一个对象，而它又是基于执行环境动态绑定，以下有4中情况可以用来分析。当函数作为对象的方法时，this指向该对象，看下面的代码： var obj = { a: 1, getA: function(){ alert(this === obj); //true alert(this.a); //1 } }; obj.getA(); 当作为普通函数调用时，此时的this总是指向全局对象window window.name = 'globalName'; var getName = function(){ return this.name; }; console.log(getName()); //globalName 下面来一个实际的例子，我们在一个div节点内部，定义一个局部的callback方法，当这个方法被当做普通函数调用时，callback内部的this就指向了window，如下代码： <html> <body> <div id="div1">我是一个Div</div> </body> <script> window.id

Call recorder not working in android 10 (Q)

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问题 Call recorder is recording blank for the duration in Android 10 (Pixel 3A). It was working fine for all phones till Android 8 and in Android 9 most phones were recording only one side voice (however it was working fine in pixel 3A) Is there any way to record calls in Android 10? The below code doesn't seem to be working anymore. int audioSource = MediaRecorder.AudioSource.VOICE_CALL; mediaRecorder.setAudioSource(audioSource); mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);

Call recorder not working in android 10 (Q)

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How to get the name of calling bat script

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问题 I need to have my 2.bat script behaviour depending on the name of calling script. Scenario: 2.bat is invoked from many other external scripts, which I am not entitled to change. Only 2.bat is under my thumb. 1.bat : ... call 2.bat 2.bat : ...here place something extracting "1.bat"... 回答1: As you cant change the calling bat there will be almost impossible to get its name if it is triggered through the cmd console (may be a memory dump could help?) as then the ProcessId will hold information