将 var 返回到调用批处理文件

Question

我启动一个批处理文件来处理一些代码，一次它调用另一个批处理文件并且应该返回一个变量，但是手册页中解释的关于 local/endlocal 的方法似乎在这里不起作用，请问我做错了什么?

第一个批处理文件：

@ECHO OFF
setlocal
call secondbatchfile.bat xyz
echo. [%val1%]

第二个批处理文件：

@if (@a==@b) @end /*                        <== btw what does this code do ???
@echo off
setlocal enabledelayedexpansion
set "URL=%~1"
set bla bla ...
do bla bla ...

for /f "delims=" %%I in ('cscript /nologo /e:jscript "%~f0" "%URL%"') do (

rem trim whitespace from beginning and end of line
for /f "tokens=*" %%x in ("%%~I") do set "line=%%x"

rem test that trimmed line matches "variable=number"
echo !line! | findstr /i "^to[a-z]*=[0-9]*" >NUL && (

rem test was successful.  Scrape number.
for /f "tokens=2 delims==" %%x in ("%%I") do set "val1=%%x"

echo !val1!                            <== this works
ENDLOCAL & SET top=%val1%              <== this not

)
)

这会导致：

c:\test>firstbatchfile.bat
123456789                                   <== this works
 []                                         <== this not

我尝试了不同的 return var 语法，例如 !val1! 或 %%val1 - 没有任何效果。我错过了什么？

更新： regarding to other example here on site我试过了：

call seconbatchfile.bat xyz ret1
echo. [%2%] [%ret1%]

并在第二个文件更改：

rem ENDLOCAL & SET %2=!val1!

也不行？

解决方案：

第二个批处理文件可以是来自 rojo 读取整个网站的原始脚本，我确实保留了修剪和匹配语法行以仅返回相关匹配：

for /f "delims=" %%I in ('cscript /nologo /e:jscript "%~f0" "%URL%"') do (

rem trim whitespace from beginning and end of line
for /f "tokens=*" %%x in ("%%~I") do set "line=%%x"

rem test that trimmed line matches "variable=number"
echo !line! | findstr /i "^[a-z]*=[0-9]*" >NUL && (

echo(%%I

)
)

调用它的第一个批处理文件将搜索两个所需的参数，如下所示：

@ECHO OFF
setlocal
for /f "delims=" %%I in ('secondbatchfile.bat "http://xyz"') do (

echo %%I | findstr /i "top" >NUL && (

for /f "tokens=2 delims==" %%x in ("%%I") do (
set "updir=%%x"
)
)
echo %%I | findstr /i "low" >NUL && (

for /f "tokens=2 delims==" %%x in ("%%I") do (
set "lowdir=%%x"
)
)
)

echo.[%updir%]
echo.[%lowdir%]

非常感谢 rojo 的精彩代码

Answer 1

最简单的解决方案是让您的第二个批处理文件回显其结果，并在第一个批处理文件中使用for 循环捕获它。取消您的 setlocal 以将环境变量传递回调用脚本是一件麻烦事。

first.bat：

@echo off
setlocal

for %%x in (
    "http://10.0.0.1/foo/vars.txt"
    "http://10.0.0.1/bar/vars.txt"
    "http://10.0.0.1/baz/vars.txt"
    "http://10.0.0.1/qux/vars.txt"
    "http://10.0.0.1/corge/vars.txt"
) do (
    for /f "delims=" %%I in ('fetchvalue.bat "%%~x"') do (
        set "val1=%%I"
    )
    echo.[%val1%]
)

fetchvalue.bat：

@if (@a==@b) @end /*

:: fetchvalue.bat <url>
:: output the "value" part of variable=value from a text file served by http

@echo off
setlocal
if "%~1"=="" goto usage
echo "%~1" | findstr /i "https*://" >NUL || goto usage

set "URL=%~1"

for /f "delims=" %%I in ('cscript /nologo /e:jscript "%~f0" "%URL%"') do (

    rem trim whitespace from beginning and end of line
    for /f "tokens=*" %%x in ("%%~I") do set "line=%%x"

    rem test that trimmed line matches "variable=number"
    echo !line! | findstr /i "^to[a-z]*=[0-9]*" >NUL && (

        rem test was successful.  Scrape number.
        for /f "tokens=2 delims==" %%x in ("%%I") do echo(%%x
    )
)

goto :EOF

:usage
echo Usage: %~nx0 URL
echo     for example: %~nx0 http://www.google.com/
echo;
echo The URL must be fully qualified, including the http:// or https://
goto :EOF

JScript */
var x=new ActiveXObject("Microsoft.XMLHTTP");
x.open("GET",WSH.Arguments(0),true);
x.setRequestHeader('User-Agent','XMLHTTP/1.0');
x.send('');
while (x.readyState!=4) {WSH.Sleep(50)};
WSH.Echo(x.responseText);

---

这是一个示例 first.bat，它将对获取的值进行排序，将low 设置为最低值，并将high 设置为最高值。

@echo off
setlocal enabledelayedexpansion

for %%x in (
    "http://10.0.0.1/foo/vars.txt"
    "http://10.0.0.1/bar/vars.txt"
    "http://10.0.0.1/baz/vars.txt"
    "http://10.0.0.1/qux/vars.txt"
    "http://10.0.0.1/corge/vars.txt"
) do (
    set low=
    for /f "delims=" %%I in ('fetchvalue.bat "%%~x" ^| sort') do (
        if not defined low set "low=%%I"
        set "high=%%I"
    )
    echo low: !low!
    echo high: !high!
)

Answer 2

您的内部批处理文件以设置名为top 的环境变量结束：set top=%val1%。您需要将其更改为 set val1=%val1%。

...
echo !val1!
ENDLOCAL & SET val1=%val1%