批量处理中，如何在输入提示字符串的开头创建空格? [英] In batch, how do I create spaces at the beginning of a input prompt string?

问题描述

假设我有一个批处理文件，其中包含"padding"，我想缩进提示字符串的开头，以供用户键入.如果使用空格，则在运行时它不会显示只是忽略空格.该脚本示例:

Let's say I have a batch file that has "padding" in it, and I want to indent the beginning of the prompt string for the user to type in. If I use spaces, it will not show up when run, it just ignores the spaces. This script for an example:

@echo off

echo.
echo.
echo    Hi.
echo    Please input something.
echo.
set /P input=   

在=之后有三个空格，我希望输入的标记远离命令框的边缘，但是这些空格将被忽略.

After the = there is three spaces, and what I expect is that the marker for input is away from the edge of the command box, however these spaces are ignored.

如何解决此问题?我正在使用Windows 7 SP1.

How can I fix this problem? I am using Windows 7 SP1.

推荐答案

正如上面的评论所述，Vista和更高版本在SET/P提示符下删除了前导空格.

As the comments above state, Vista and beyond strip leading spaces in a SET /P prompt.

解决问题的方法是在提示中定义和使用退格字符.

The way to get around the problem is to define and use a backspace character in the prompt.

::define a variable containing a single backspace character
for /f %%A in ('"prompt $H &echo on &for %%B in (1) do rem"') do set BS=%%A

set /p var=%BS%   Leading spaces will not show properly.

通常提示会在一行的开头，因此上面的方法就可以了.

Normally the prompt will be at the beginning of a line, so the above works just fine.

但是，如果提示是从一行的中间发出的(非常不寻常)，则应该在<BS>之前添加一个前导字符，因为退格键将删除之前的所有内容.

But if the prompt is issued from the middle of a line (very unusual), then a leading character should be included prior to the <BS>, since the backspace will erase whatever was before it.

<nul set/p=Leave the cursor at the end of this line:
set /p var=.%BS%   The dot (any char) is necessary to prevent the <BS> from erasing the :

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