批量变量不递增！

Question

SET /a _count = 1 

set /p drive=Please type drive name[C/D/E/F/..]?: 
echo Creating Directory %drive%:\AKI_Data_Feeds 
mkdir %drive%:\AKI_Data_Feeds 

for /f %%a in (companyList.txt) do (
echo Creating Directory %drive%:\AKI_Data_Feeds\%%a 
mkdir %drive%:\AKI_Data_Feeds\%%a 

for /f %%b in (branch1.txt) do (
echo Creating Directory %drive%:\AKI_Data_Feeds\%%a\%%b 
mkdir %drive%:\AKI_Data_Feeds\%%a\%%b 


if "%_count%"=="1" (

for /f %%c in (branch1_1.txt) do (
echo Creating Directory %drive%:\AKI_Data_Feeds\%%a\%%b\%%c 
mkdir %drive%:\AKI_Data_Feeds\%%a\%%b\%%c 

for /f %%e in (branch2.txt) do (
echo Creating Directory %drive%:\AKI_Data_Feeds\%%a\%%b\%%c\%%e 
mkdir %drive%:\AKI_Data_Feeds\%%a\%%b\%%c\%%e 
) 

) 

SET /a _count +=1 
echo %_count% 

) 
if "%_count%"=="2" (
for /f %%d in (branch1_2.txt) do (
echo Creating Directory %drive%:\AKI_Data_Feeds\%%a\%%b\%%d 
mkdir %drive%:\AKI_Data_Feeds\%%a\%%b\%%d 

for /f %%e in (branch2.txt) do (
echo Creating Directory %drive%:\AKI_Data_Feeds\%%a\%%b\%%c\%%e 
mkdir %drive%:\AKI_Data_Feeds\%%a\%%b\%%c\%%e 
) 

) 

SET /a _count +=1 

) 

) 
) 

echo Successfully created. 
pause 

_count是没有得到增加

Answer 1

您需要延迟扩展解决这个问题。
由于所有百分比变量在解析块时展开，因此它们的值似乎未发生变化。

随着延迟扩展，变量在执行时被扩展。

setlocal EnableDelayedExpansion 
set count=0 
(
    set /a count+=1 
    echo %count% fails 
    echo !count! works 
)