windows 如何在嵌套循环批处理脚本中中断内循环
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How to break inner loop in nested loop batch script
提问by Rock with IT
MY goal is to compare two files line by line and capture the changes. For that i am using two nested loops. I am stuck with braking the inner loop on some condition.
我的目标是逐行比较两个文件并捕获更改。为此，我使用了两个嵌套循环。在某些情况下，我坚持制动内循环。
I am using label outside the inner loop for break it, but not working. It goes to label and terminate outer loop also.
我在内循环外使用标签来打破它，但不起作用。它也去标记和终止外循环。
@ echo off
SETLOCAL EnableDelayedExpansion
for /F "skip=8 tokens=* delims=." %%a in (sample.txt) do (for /F "skip=8 tokens=* delims=." %%b in (test.txt) do (if %%a==%%b (goto :next) else ( echo %%a)
)
: Next
echo out of inner loop
)
Anyone can help....?
任何人都可以帮助......？
回答by jeb
A goto :label always breaks all loops.
goto :label 总是会中断所有循环。
But you can put your inner loop in a separated function, then it could work.
但是你可以把你的内部循环放在一个单独的函数中，然后它就可以工作了。
@echo off
SETLOCAL EnableDelayedExpansion
for /F "skip=8 tokens=* delims=." %%a in (sample.txt) do (
call :myInnerLoop "%%a"
)
echo out of inner loop
)
goto :eof
:myInnerLoop
for /F "skip=8 tokens=* delims=." %%b in (test.txt) do (
if "%~1"=="%%b" (
goto :next
) else (
echo %%a
)
:next
goto :eof
One remark, breaking of FOR /L loops does not work as expected, the for-loop always count to the end, but if you break it, the execution of the inner code is stopped, but it could be really slow.
一句话， FOR /L 循环的中断没有按预期工作，for 循环总是计数到最后，但是如果中断它，内部代码的执行就会停止，但它可能真的很慢。
@echo ON
FOR /L %%n IN (1,1,1000000) DO (
echo %%n - count
goto :break
)
:break
EDIT:
编辑：
Proof of concept
概念证明
@echo off
SETLOCAL EnableDelayedExpansion
for %%a in (a b c) DO (
echo Outer loop %%a
call :inner %%a
)
goto :eof
:inner
for %%b in (U V W X Y Z) DO (
if %%b==X (
echo break
goto :break
)
echo Inner loop Outer=%1 Inner=%%b
)
:break
goto :eof
Output
输出
Outer loop a
Inner loop Outer=a Inner=U
Inner loop Outer=a Inner=V
Inner loop Outer=a Inner=W
break
Outer loop b
Inner loop Outer=b Inner=U
Inner loop Outer=b Inner=V
Inner loop Outer=b Inner=W
break
Outer loop c
Inner loop Outer=c Inner=U
Inner loop Outer=c Inner=V
Inner loop Outer=c Inner=W
break
回答by user1037135
Even if the goto label is in the for loop, it also goes out the loop context. Such as
即使 goto 标签在 for 循环中，它也会离开循环上下文。如
@echo off
for %%d in (A B) do (
echo %%d
for %%f in ( 1 2 ) do (
goto loop
:loop
echo %%d %%f
)
)
This will print out A %d %f
这将打印出 A %d %f
