在批处理文件中使用开关

发布于 2024-09-13 02:50:15 字数 370 浏览 2 评论 0原文

我有一个批处理文件，我需要像“mybatch.bat -rc:\mydir”一样调用它，并且批处理文件循环遍历目录并将文件名写入输出。我面临的问题是我无法读取参数“-r”。

它看起来像这样：

@echo off
echo [%date% %time%] VERBOSE    START
for %%X in (%1\*.xml) do echo [%date% %time%] VERBOSE    systemmsg Parsing XML file '%%X'
echo [%date% %time%] VERBOSE    END

但是我可以使用 %2 而不是 %1 并且一切正常，但我想按参数读取。这可能吗？

干杯!

原文

I have a batch file and I need to invoke it like this "mybatch.bat -r c:\mydir", and the batch file loops through the directory and writes file names to the output. The problem I'm facing is that I cannot read parameter "-r".

Here's what it looks like:

@echo off
echo [%date% %time%] VERBOSE    START
for %%X in (%1\*.xml) do echo [%date% %time%] VERBOSE    systemmsg Parsing XML file '%%X'
echo [%date% %time%] VERBOSE    END

I can however use %2 instead of %1 and all works fine, but I want to read by parameter. Is this possible?

Cheers!

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债姬 2024-09-20 02:50:15

我不完全确定我看到了你的问题。在这种情况下，%1 显然是 -r 并且您应该使用 %2，即 c :\mydir。

如果您的意思是要确保用户首先指定 -r，您可以使用类似以下内容：

@echo off
if not "x%1"=="x-r" (
    echo [%date% %time%] ERROR Called without -r
    goto :eof
)
echo [%date% %time%] VERBOSE    START
for %%X in (%2\*.xml) do echo [%date% %time%] VERBOSE systemmsg Parsing file '%%X'
echo [%date% %time%] VERBOSE    END

如果 -r 是可选，则您通常可以这样做：

set fspec=%1
set rflag=no
if "x%fspec"=="x-r" (
    set fspec=%2
    set rflag=yes
)

然后使用rflag和fspec。

批量进行真正的位置无关参数解析并不是一件容易的事。我们有一个子系统可以做到这一点，但不幸的是，它是专有的。我会告诉你，它跑了大约80多条线，并不是世界上最快的野兽。

我的建议是对参数格式施加严格的要求，而不是走与位置无关的道路。你会省去很多麻烦:-)

I'm not entirely sure I see your problem. %1 in this case is clearly -r and you should be using %2 which is c:\mydir.

If you mean you want to ensure that the user specifies -r first, you can use something like:

@echo off
if not "x%1"=="x-r" (
    echo [%date% %time%] ERROR Called without -r
    goto :eof
)
echo [%date% %time%] VERBOSE    START
for %%X in (%2\*.xml) do echo [%date% %time%] VERBOSE systemmsg Parsing file '%%X'
echo [%date% %time%] VERBOSE    END

If the -r is optional, you can often do:

set fspec=%1
set rflag=no
if "x%fspec"=="x-r" (
    set fspec=%2
    set rflag=yes
)

and then use rflag and fspec.

Doing true position-independent parameter parsing in batch is not an easy job. We have a subsystem which does it but unfortunately, it's proprietary. I will tell you it runs across about 80-odd lines and is not the fastest beast in the world.

My advice would be to impose strict requirements of the argument formats rather than go down the position-independent path. You'll save yourself a lot of hassles :-)

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