位置: 编程技术 - 正文

DOS批处理 函数定义与用法(dos命令批量处理文件)

编辑:rootadmin

推荐整理分享DOS批处理 函数定义与用法(dos命令批量处理文件),希望有所帮助,仅作参考,欢迎阅读内容。

文章相关热门搜索词:dos批处理实例,dos批处理实例800例,dos批处理命令,dos批命令,dos批处理实例800例,dosbox批处理,dos批处理命令,dos常用命令与批处理文件,内容如对您有帮助,希望把文章链接给更多的朋友!

What it is, why it`s important and how to write your own.

Description: The assumption is: A batch script snippet can be named a function when:

1.... it has a callable entrance point.2.... on completion execution continues right after the command that initially called the function.3.... it works the same no matter from where it`s being called, even when it calls itself recursively.4.... the variables used within a function do not conflict with variables outside the function.5.... it exchanges data with the calling code strictly through input and output variables or a return code.

The benefits behind functions are:

1.Keep the main script clean2.Hide complexity in reusable functions3.Test functions independently from the main script4.Add more functionality to your batch script simply by adding more functions at the bottom5.Don`t worry about the function implementation, just test it and use it Create a Function What is a function&#; Call a Function How to invoke a function&#; Example - Calling a Function An Example showing how it works. Passing Function Arguments How to pass arguments to the function&#; Parsing Function Arguments How to retrieve function arguments within the function&#; Example - Function with Arguments An Example showing how it works. Returning Values the Classic Way The classic way of returning values and the limitations. Returning Values via References Let the caller determine how to return the function result and avoid the need of dedicated variables. Example - Returning Values using Variable Reference An Example showing how it works. Local Variables in Functions How to avoid name conflicts and keep variable changes local to the function&#; Returning Local Variables How to pass return values over the ENDLOCAL barrier&#; Recursive Functions Tadaaah!!! Summary Defining a standard format for a DOS batch function DOS Batch - Function Tutorial What it is, why it`s important and how to write your own.

Create a Function - What is a functionDescription: In DOS you write a function by surrounding a group of command by a label and a GOTO:EOF command. A single batch file can contain multiple functions defined like this. The label becomes the function name. Script:

Call a Function - How to invoke a functionDescription: A function can be called with the CALL command followed by the function label. Script: . call:myDosFunc

Example - Calling a Function - An Example showing how it worksDescription: The use of batch functions will divide the script into two sections.

1.The main script: starting at line 1 ending with a GOTO:EOF command that terminates the script.2.The function section: filling the second half of the batch file with one or more functions to be callable from the main script. Script:

Script Output: Script Output going to execute myDosFunc here the myDosFunc function is executing a group of commands it could do a lot of thingsreturned from myDosFunc Press any key to continue . . . Passing Function Arguments - How to pass arguments to the functionDescription: Just as the DOS batch file itself can have arguments, a function can be called with arguments in a similar way. Just list all arguments after the function name in the call command. Use a space or a comma to separate arguments. Use double quotes for string arguments with spaces. Script:

Parsing Function Arguments - How to retrieve function arguments within the functionDescription: Just as the DOS batch file itself retrieves arguments via %1 â&#;¦ %9 a function can parse it`s arguments the same way. The same rules apply. Let`s modify our previews example to use arguments. To strip of the double quotes in an arguments value the tilde modifier, i.e. use %~2 instead of %2. Script:

Example - Function with Arguments - An Example showing how it worksDescription: The following example demonstrates how to pass arguments into a DOS function. The :myDosFunc function is being called multiple times with different arguments.

Note: The last call to myDosFunc doesn`t use double quotes for the second argument. Subsequently "for" and "me" will be handled as two separate arguments, whereas the third argument "me" is not being used within the function. Script: Script Output: Script Output going to execute myDosFunc with different arguments here the myDosFunc function is executing a group of commands it could do of things YeePEE. here the myDosFunc function is executing a group of commands it could do of things for me. here the myDosFunc function is executing a group of commands it could do of things for me. here the myDosFunc function is executing a group of commands it could do of things for. Press any key to continue . . .

Returning Values the Classic Way - The classic way of returning values and the limitationsDescription: The CALL command doesn`t support return values as known by other programming languages. The classic walkaround is to have the function store the return value into a environment variable. The calling script can use this variable when the function returns. The :myGetFunc function below demonstrates how the variable var1 gets the "DosTips" string assigned which can then be used in the calling function.

DOS批处理 函数定义与用法(dos命令批量处理文件)

Note: The var1 variable is reserved for this particular function. Any data stored in var1 by the calling function before calling :myGetVar will be overwritten. Usage:

Script:

Script Output: Script Output var1 before: some hopefully not important stringvar1 after : DosTips Returning Values via References - Let the caller determine how to return the function result and avoid the need of dedicated variablesDescription: Instead of using "global" variables for return value, the function can use one of it`s arguments as variable reference. The caller can then pass a variable name to the function and the function can store the result into this variable making use of the command line expansion of the command processor:

Note: The var1 variable is not reserved for this articular function. Any variable can be passed to the function the caller has full control. Usage:

Script:

Script Output: Script Output var1 after : DosTips Example - Returning Values using Variable Reference - An Example showing how it worksDescription: This code shows how the var1 variable is being passed into a :myGetFunc function simply by passing the variable name. Within the :myGetFunc function the command processor works like this:1.Reads the set command into memory: set "%~1=DosTips"2.Expand the variables, i.e. %~1 like this: set "var1=DosTips"3.Finally execute the command and assign the new string to var1 Script:

Script Output: Script Output var1 before: CmdTipsvar1 after : DosTips Press any key to continue . . .

Local Variables in Functions - How to avoid name conflicts and keep variable changes local to the functionDescription: The SETLOCAL causes the command processor to backup all environment variables. The variables can be restored by calling ENDLOCAL. Changes made im between are local to the current batch. ENDLOCAL is automatically being called when the end of the batch file is reached, i.e. by calling GOTO:EOF. Localizing variables with SETLOCAL allows using variable names within a function freely without worrying about name conflicts with variables used outside the function. Script:

Script Output: Script Output aStr before: Expect no changed, even if used in functionvar1 before: No change for this one. Now what&#;aStr after : Expect no changed, even if used in functionvar1 after : No change for this one. Now what&#; Press any key to continue . . . Returning Local Variables - How to pass return values over the ENDLOCAL barrierDescription: The question is: When localizing a function via SETLOCAL and ENDLOCAL, how to return a value that was calculated before executing ENDLOCAL when ENDLOCAL restores all variables back to its original state&#; The answer comes with "variable expansion". The command processor expands all variables of a command before executing the command. Letting the command processor executing ENDLOCAL and a SET command at once solves the problem. Commands can be grouped within brackets. Script:

Script Output: Script Output aStr before: Expect no changed, even if used in functionvar1 before: Expect changedaStr after : Expect no changed, even if used in functionvar1 after : DosTips Press any key to continue . . .

Recursive Functions - Tadaaah!!!Description: Being able to completely encapsulate the body of a function by keeping variable changes local to the function and invisible to the caller we are now able to call a function recursively making sure each level of recursion works with its own set of variables even thought variable names are being reused.

Example: The next example below shows how to calculate a Fibonacci number recursively. The recursion ss when the Fibonacci algorism reaches a number greater or equal to a given input number. The example starts with the numbers 0 and 1 the :myFibo function calls itself recursively to calculate the next Fibonacci number until it finds the Fibonacci number greater or equal .

The first argument of the myFibo function is the name of the variable to store the output in. This variable must be initialized to the Fibonacci number to start with and will be used as current Fibonacci number when calling the function and will be set to the subsequent Fibonacci number when the function returns. Script:

Script Output: Script Output The next Fibonacci number greater or equal is . Press any key to continue . . . Summary - Defining a standard format for a DOS batch functionDescription: With the information learned in this section we can define a standard format for a DOS batch functions as shown below. Also check out the rich set of ready to use DOS functions provided by the DosTips.com function library. Script:

出处:

批处理bat命令 获取当前盘符和当前目录和上级目录的代码 批处理命令获取当前盘符和当前目录%~d0是当前盘符%cd%是当前目录可以用echo%cd%进行打印测试以下例子是命令行编译VisualStudio编写的程序:@echooffsetb=%cd%//

ECHO 不换行实现方法 我想用批处理实现向s.txt中多次分别导入文本例如:aaaa","bbbb","cccc","dddd"实现s.txt内效果如:aaaabbbbccccdddd可是echo命令每次导入的时候会强制换行,如:aaa

CMD中使用attrib命令设置文件只读、隐藏属性详解 本文介绍一个cmd下的一个attrib.exe的小程序,它可以用来设置文件的属性。我们知道文件的属性有只读、隐藏、系统、存档和无内容索引等5个,只读和隐

标签: dos命令批量处理文件

本文链接地址:https://www.jiuchutong.com/biancheng/371857.html 转载请保留说明!

上一篇:批处理bat计算两个时间差(bat批处理命令大全)

下一篇:批处理bat命令 获取当前盘符和当前目录和上级目录的代码(批处理 /b)

  • 税务机关对企业实施特别纳税调整,涉及企业向境外
  • 占用农村宅基地建豪宅
  • 收到失控发票写情况说明
  • 购入固定资产如何摊销
  • 白酒销售环节交消费税吗
  • 委托加工的账务处理
  • 印鉴变更手续费50元
  • 银行定期存款取钱需要本人吗
  • 公司买的车怎么做分录
  • 进项发票没有收到,销项已开出,成本如何结转
  • 增值税一般纳税人与小规模纳税人的区别
  • 下月初认证的发票怎么开
  • 转账银行汇票遗失后可以申请办理
  • 出纳应做到
  • 确认无法回收的应收账款会计分录
  • 无偿转让股权需要交什么税
  • 未开票的货款记什么科目
  • win7系统怎么进
  • 如何正确使用储存卡
  • linux怎么设置
  • 孕妇可以喝蜂蜜水吗?
  • 收到对方给的发票怎么做账
  • 代开的发票没有人名行不行?
  • php计算时间
  • 支付宝流量红包怎么取消
  • 汽车销售公司取名字参考大全图片
  • 资产购置融资
  • 投资性房地产减值准备属于什么科目
  • win11dev预览版可以升级正式版吗
  • php 二叉树
  • 都柏林圣三一学院图片
  • 瓦普拉克
  • 经营收益是净利润吗
  • html+javascript
  • 股权转让实操
  • java中文乱码解决总结
  • 毕业设计基础
  • uniapp 手写识别
  • web前端面试题目
  • 清算汇缴报表填什么内容
  • python 3.4.3 shell
  • 销项税每月有余额年底怎么处理
  • sql server 判断数据是否存在
  • okhttp源码
  • 富文本word
  • 单位财务报销制度和流程
  • 印花税该是如何征收的
  • 公司刚成立没有员工需要申报个税吗
  • 增值税进项税额抵扣期限最新
  • 主营业务收入的计算公式
  • 制作费计入什么费用
  • 外账需要计提存利息吗
  • 结转借贷方向如何计算
  • 开红字发票如何做分录?
  • 定期存款到期转存利息也转存吗
  • 会计做内账的技巧与方法
  • 新旧收入准则对比区别表
  • Mysql 数据库 拷贝 原文件
  • centos 7.5 7.6
  • windows图标显示不出来
  • windows7安装后正常使用的安装方法
  • win8怎么让我的电脑显示在桌面上
  • 常见内存大小
  • centos重新安装命令
  • linux在u盘中运行
  • 怎么用linux运行c程序
  • win7系统搜索功能没了
  • linux用root登录
  • es6class类用法
  • cpu时钟预取实例是什么
  • node-js
  • javascript定律
  • 手机android版本强制升级
  • jquery鼠标移入移出切换图片
  • java 视频教程
  • javascript的代码
  • js拖拽div
  • 深圳税务 qzzn
  • 地税局和税务局有什么区别
  • 怎么查询车船税缴费记录
  • 免责声明:网站部分图片文字素材来源于网络,如有侵权,请及时告知,我们会第一时间删除,谢谢! 邮箱:opceo@qq.com

    鄂ICP备2023003026号

    网站地图: 企业信息 工商信息 财税知识 网络常识 编程技术

    友情链接: 武汉网站建设