批处理脚本：两位数小于一位数

Question

我是批处理脚本的新手，不明白为什么两位数的计算结果小于一位数？

%weekdayOffPeakEnd% 变量在回显时为 7。

我从 FOR 循环（未显示）中调用此 sleepUntilOffPeak 函数，但我认为这不会产生任何影响，因为我没有在脚本中的其他任何地方使用此函数中的任何变量。此功能只是检查当前时间并“休眠”，直到电费再次变低。

谢谢

rem if not currently off-peak hours, wait (timeout) until electricity rates are lowest
:sleepUtilOffPeak
rem set DayofWeek and Hour variables
for /f %%a in ('wmic path win32_localtime get DayOfWeek /format:list ^| findstr "="') do (set %%a)
for /f %%a in ('wmic path win32_localtime get Hour /format:list ^| findstr "="') do (set %%a)
rem echo Day of week^: %DayOfWeek%
echo Hour^: %Hour%

rem set OffPeak variables
set /a weekdayOffPeakEnd=07
echo weekdayOffPeakEnd^: %weekdayOffPeakEnd%
set /a weekdayOffPeakStart=23
set /a weekendOffPeakEnd=15
set /a weekendOffPeakStart=19

set weekday=true
if "%DayOfWeek%" EQU "0" set weekday=false
if "%DayOfWeek%" EQU "6" set weekday=false
rem echo weekday^: %weekday%

if %weekday% equ true (
    echo Today is a weekday
    if Hour LSS weekdayOffPeakEnd (
        echo %Hour% is less than off-peak end^:  %weekdayOffPeakEnd%. Returning...
        exit /B 0
    ) else (
        if Hour GEQ weekdayOffPeakStart (
            echo %Hour% is greater than or equal to off-peak start^: %weekdayOffPeakStart%. Returning...
            exit /B 0
        ) else ( rem Hour is between 07 and 23
            rem sleep until offPeak then return
            set /a sleepTime=23-%Hour%
            set /a sleepSeconds=%sleepTime%*3600
            echo Going to sleep for %sleepSeconds% seconds
            timeout /t %sleepSeconds%
            exit /B 0
        )
    )
) else ( rem weekday equ false
    echo Today is a weekend
    if Hour LSS weekendOffPeakEnd (
        echo %Hour% is less than off-peak end^: %weekendOffPeakEnd%. Returning...
        exit /B 0
    ) else (
        if Hour GEQ weekendOffPeakStart (
            echo %Hour% is greater than or equal to off-peak start^: %weekendOffPeakStart%. Returning...
            exit /B 0
        ) else ( rem Hour is between 15 and 19
            rem sleep until offPeak then return
            set /a sleepHours=%weekendOffPeakStart%-%Hour%
            echo sleepHours^: %sleepHours%
            set /a sleepSeconds=%sleepHours%*3600
            echo Going to sleep for %sleepSeconds% seconds
            timeout /t %sleepSeconds%
            echo All done sleeping. Returning...
            exit /B 0
        )
    )
)

Answer 1

你有很多这样的例子：

if Hour LSS weekdayOffPeakEnd (

这会将文字 Hour 与文字 weekdayOffPeakEnd 进行比较

你需要

if %Hour% LSS %weekdayOffPeakEnd% (

此外，如果您更改 代码块（带括号的代码）内的任何变量的值，那么您需要检索更改的值使用 !var! 已调用 delayed expansion（使用 search 定位许多 SO 项）

此外，您观察到set /a var=07 会将变量设置为7，而不是07。了解set /a 和set 之间的区别很重要。 set /a 解析要分配的值，然后将该值作为字符串分配给变量，抑制前导零。 set 分配包含前导零的文字。

这会导致两个后果。首先，以0 开头的值由set/a 分配为OCTAL 值，因此08 和09 将无效。其次，if %var% op val 将尝试将运算符的 both 参数转换为数字来执行比较，如果 both 转换都成功，则比较作为数字比较，否则作为字符串比较执行，其中字符从左侧开始连续匹配。