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" ;.在这个时候出乎意料的是“从批处理脚本行生成'如果存在[文件]（...

分类: 技术问答 • 2022-07-15 22:06:54
问题描述：

相关代码如下所示：

cd /d %~dp0

if exist filename.txt (
    echo %date% %time% *** text... >> filename2.txt
    echo ==============================
    echo ===  text.......           ===
    echo ===  text.......           ===
    echo ===  text....... (text...) ===
    echo ===  text (text... 
    echo ===  text...).
    :loop
        set /p "varx= text: "
    if "%varx%" neq "xxxx" goto loop

 ... more script...

)

已搜索高低解决方案...

Have searched high and low for solutions...

  • was pointed in direction of If statement groupings here: https://www.petri.com/forums/forum/windows-scripting/general-scripting/57625-if-exists-file-was-unexpected-at-this-time - NO GO

指向If块中的循环问题的方向，这里：
（Windows批处理）转到if块表现得非常奇怪 - 没有GO

was pointed in direction of problems with loops in If blocks, here: (Windows batch) Goto within if block behaves very strangely - NO GO

指向使用@setlocal enabledelayedexpansion或@setlocal enableextensions的方向（无法追踪到哪里） - 没有GO

Was pointed in direction of using @setlocal enabledelayedexpansion or @setlocal enableextensions (can't track down where) - NO GO

尝试通过set / p varfile =filename传递文件名，如果存在％varfile％ - 没有GO

tried passing filename via set /p varfile="filename" and if exist %varfile% - NO GO

当然认为还有其他部分代码导致错误 - 没有GO

of course thought there were other parts of code causing error -- NO GO

事情是这个WAS工作了很长时间......然后我改变了我认为的一些无害的东西，无法弄清问题在哪里......

The thing is that this WAS working for a long while...then I changed what I thought was some innocuous stuff and cannot figure out where the problem lies...

这样一个难以理解的问题要解决......好的！

such an obscure problem to solve..ugh!

答

来自的整个复合语句，如果e xist ...（到右括号是一个代码块。

The entire compound-statement from the if exist ... ( through to the closing parenthesis is a code block.

在代码块中，不允许使用标签，未转义的）将终止块和任何％var％被替换为该变量的值。

Within a code block, labels are not allowed, an un-escaped ) will terminate the block and any %var% is replaced by that variable's value when the block is encountered.

您需要致电 ：循环例程（最简单的方法）

You need to call the :loop routine (easiest way)

if exist filename.txt (
    echo %date% %time% *** text... >> filename2.txt
    echo ==============================
    echo ===  text.......           ===
    echo ===  text.......           ===
    echo ===  text....... (text...^) ===
    echo ===  text (text... 
    echo ===  text...^).
    call :loop

 ... more script...

)

...等

转到：eof

：循环
set / pvarx = text：
if％varx％neqxxxxgoto loop

:loop set /p "varx= text: " if "%varx%" neq "xxxx" goto loop

goto：eof

请注意 goto：eof 已定义为转到文件结尾 （冒号必需）

Note the goto :eof is defined to be "go to end-of-file" (The colon is required)

注意调用在标签前有一个冒号 - 这表明它是一个内部例程 - 它驻留在这个批处理文件中

Note the call has a colon before the label - this indicates it's an internal routine - it resides in this batchfile

注意每个）现在通过 ^ 进行转义，这使得）普通字符，而不是语句终结符。

Note that each ) is now escaped by a ^ which makes ) an ordinary character, not a statement-terminator.

你可能已经删除了一个重定向器 - 调用中的任何 echo ed程序将被收集到重定向输出中 - 即如果你有

You've probably removed a redirector - any echo within the called procedure will be gathered into the redirected output - that is if you have

(
whatever...
)>filename

然后代码块中的任何数据 echo 将被重定向到文件 - 在调用 ed过程中包含 echo es。您可以使用 echo to console> con 在这样的块或过程中显式重定向 echo 。

then any data echoed within the code block will be redirected to the file - including echoes within a called procedure. You can explicitly redirect an echo within such a block or procedure using echo to console>con for instance.

在括号中包含任何行序列，使其成为代码块允许重定向 echo 来自块的ed输出，所以

Encasing any sequence of lines in parentheses, making it a code block allows redirection of the echoed output from the block, so

(
 echo this
 echo that
)>filename

创建一个新的文件名包含 echo es的总和，而不是必须在每行附加>> filename 。显然，>> 代替> 将追加添加到任何现有文件以通常的方式。

creates a new filename containing the sum of the echoes rather than having to append >>filename to each line. Obviously, >> in place of > will append to any existing file in the usual manner.

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