循环遍历批处理文件中的 ASCII 代码

如何循环 ASCII 值（此处为字母表）并对其进行处理？

我想回显 A 到 Z，而不必像这样手动输入每个字符for %%J in (A B C D E F G H I J K L M N O P Q R S T U V W X Y Z) do echo %%J

所以我想知道是否可以循环使用 ASCII 代码。就像是for %%J in (ASCII of A ie.65 to Z) do echo %%J

任何帮助，将不胜感激。

Surprisingly, there is a solution that makes use of an undocumented built-in environment variable named =ExitCodeAscii, which holds the ASCII character of the current exit code¹ (ErrorLevel):

@echo off
for /L %%A in (65,1,90) do (
    cmd /C exit %%A
    call echo %%^=ExitCodeAscii%%
)

The for /L循环遍历（十进制）字符代码A to Z. cmd /C exit %%A设置返回码（ErrorLevel) 到当前迭代的代码，即echo-ed 之后作为一个角色。call，与双%-signs 为命令行引入第二个解析阶段，以便获取当前值=ExitCodeAscii而不是整个面前的那个for /L循环被执行（这将通过一个简单的命令行发生，例如echo %=ExitCodeAscii%）。或者，延迟扩张也可以用。

基本思想归功于rojo并在这篇文章中应用：如何批量获得随机字母输出.

_{1) The exit code (or return code) is not necessarily the same thing as the ErrorLevel value. However, the command line cmd /C exit 1 sets both values to 1. To ensure that the exit code equals ErrorLevel, use something like cmd /C exit %ErrorLevel%.}