使用cmd循环执行命令 [英] Executing commands one with a loop with cmd

问题描述

我想创建一个批处理文件，该文件既执行一次命令，又一次执行循环.当循环再次发生时，该命令将不再执行.这是循环的代码:

I want to create a batch file that both executes a command once, and do a loop at the same time. When the loop occurs again, the command won't be executed anymore. Here is the code for the loop:

@echo off
setlocal EnableDelayedExpansion
for /f %%a in ('copy /Z "%~dpf0" nul') do set "CR=%%a"

FOR /L %%n in (1,1,10) DO (
    call :spinner
    ping localhost -n 2 > nul
)
exit /b

:spinner
set /a "spinner=(spinner + 1) %% 4"
set "spinChars=\|/-"
<nul set /p ".=Rebuilding, please wait... !spinChars:~%spinner%,1!!CR!"
exit /b

但是有一个问题:循环将执行，并且仅在命令完成后才执行.而且循环没有超时，因此基本上，它将永远进行循环，直到我按Ctrl + C为止. 谁能帮我这个?如果可以的话，请使上面的代码更好.预先感谢.

However there's a problem: The loop will execute and only executes when the command is done. And there are no timeouts for the loop, so basically, it will do the loop forever, until I press Ctrl + C. Can anyone help me with this? And if you can, please make the code above better. Thanks in advance.

推荐答案

在第一个实例中执行命令时，将变量设置为真值，并在执行所述命令之前在该变量中进行条件测试

Set a variable with a true value when the command is executed in the first instance, and Conditional testing in that variable prior to executing said command

If not "!EXC!" == "" (Echo First Run) Else (Set "EXC=True")

示例使用延迟扩展，因为它可以在For循环和Label循环中使用.

Example uses delayed expansion as it is usable both in For Loops and Label Loops.

如果您想打破循环，请对Goto:Label使用条件测试

If you want to Break the Loop, Use the conditional testing to Goto :Label

现在您已经提供了更多的问题详细信息，我相信您想要的是这样的东西.

Now that you've provided more detail in your question, I believe something like this is what you're going for.

@echo off
setlocal EnableDelayedExpansion
for /f %%a in ('copy /Z "%~dpf0" ^> nul') do set "CR=%%a"
set "spinChars=\|/-"
   for /f "delims=#" %%a in ('"prompt #$H# &echo on &for %%b in (1) do rem"') do (
      set "BS=%%a"
      set "BS=!BS:~0,1!"
   )

<nul set/p=Rebuilding, please wait... 
FOR /L %%. in () DO (
REM insert conditional testing to break loop Here
    set /a "spinner=(spinner + 1) %% 4"
    For %%/ in (!Spinner!) Do <nul set /p=%BS%!spinChars:~%%/,1!
)
exit /b

:End_Loop
Echo You have Exited the process
Pause
Exit /B

退格字符的定义来自此帖子

The Definition of the Backspace Character comes from this post

无论在加载循环中等待什么过程，您都需要某种方法来测试其是否完成.鉴于您尚未详细介绍，我将建议一些选项:

Whatever process your waiting for in the loading loop you will need some method to test for it's completion. Seeing as you've not detailed, I'll suggest some options:

• 文件的存在
• 变量值
• 针对任务列表进行测试以查看任务是否仍处于活动状态的结果.

如果您提供有关正在等待的命令/进程的更多详细信息，则可以提供有关条件测试的更好答案.

If you provide more detail regarding the command / process you are waiting on, a better answer regarding the conditional testing can be offered.

示例方法在同一窗口中将子例程作为单独的实例运行，并在命令执行完成后使用信号文件与主循环通信:

An example method that runs a subroutine as a seperate instance in the same window, and uses Signal Files to communicate to the main Loop when command execution has completed:

::: ** Batch Multithreading example by T3RRY ** :::
    @Echo Off & CD "%~dp0"                      :::
:::::::::::::::::::::::::::::::::::::::::::::::::::

::: - Define any Variables to be used by both Environments
    Set "spinChars=\|/-"
::: - Test if Thread Two is to be executed
    If /I "%~1" == "Thread2" Goto :Thread2
::: - Localise Thread Ones Environment
    Setlocal EnableDelayedExpansion
::: - Ensure previous Signal files removed in case program exited incorrectly
    Del /Q /F "%TEMP%\CMDrun.log"
    Del /Q /F "%TEMP%\CMDend.log"
    CLS
::: - Define Backspace Character for Animation
    For /F "delims=#" %%a in ('"prompt #$H# &echo on &for %%b in (1) do rem"') do (
      Set "BS=%%a"
      Set "BS=!BS:~0,1!"
    )

    <Nul Set/P=Processing, please wait. 
:Loop
::: - Launch Thread Two in Same window if Not already Running
::: - Conditional tests on signal files redirect errors to Standard error to prevent erroneous output
::: - when testing occurs at the same time the file is being written to.
    (IF Not Exist "%TEMP%\CMDrun.log" Start /B "" "%~F0" Thread2) 2>Nul
::: - Animation To indicate commands in thread one are running. A Loop is used in this example.
    Set /A "spinner=(spinner + 1) %% 4"
    For %%S in (!Spinner!) Do <Nul Set /P=%BS%!spinChars:~%%S,1!
::: - Exit Thread One once Thread Two has Completed
    (IF Exist "%TEMP%\CMDend.log" Goto :End_Loop) 2>Nul
Goto :Loop

:End_Loop
::: - Clean up Signal Files
    Echo.
    Del /Q /F "%TEMP%\CMDrun.log"
    Del /Q /F "%TEMP%\CMDend.log"
    Echo Process Complete
    Pause
::: - Demonstrate stability of multithreading through repetition
    Start "" "%~F0"
Exit

:Thread2
::: Localise Thread Two's Environment
    Setlocal EnableDelayedExpansion
    >"%TEMP%\CMDrun.log" (Echo running)
::: - Title update to demonstrate commands executed in thread two are running
    For /L %%# In (1,1,10000) Do (
        Set /a "spinner=(spinner + 1) %% 4"
        For %%S in (!Spinner!) Do TITLE !spinChars:~%%S,1! Output %%#
    )
    >"%TEMP%\CMDend.log" (Echo finished)
::: - Hard exit of Thread Two used to prevent script overflow.
EXIT

这篇关于使用cmd循环执行命令的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！