I have a challenging problem.

my requirement for batch script,

1. check whether Firefox browser is running..
2. And if it is running batch script will play a music.
3. Script will stay awake until browsing session completes & user closes the browser. (Script will never exits ever since system booted up until the shutdown. Means always stay awake to play the music each & every time user opens up Firefox browser)

Following is the script I've written,

@echo off

: loop
tasklist /fi "imagename eq Firefox.exe" |find ":" > nul
if errorlevel 1 (start "C:\Program Files\KMPlayer 64X\KMPlayer64" "C:\Users\UserName\Desktop\Apple.mp3") else (goto loop)
// no exit

This script only runs for the first time and it does not loop. Can anybody help?

CodePudding user response：

Here is one possible solution:

@echo off
title Firefox Watcher
setlocal EnableExtensions DisableDelayedExpansion
set "MusicPlay="

:Loop
%SystemRoot%\System32\tasklist.exe /FI "IMAGENAME eq Firefox.exe" /NH 2>nul | %SystemRoot%\System32\find.exe /I "firefox.exe" || goto NoFirefox

if defined MusicPlay goto WaitTime
start "" "%ProgramFiles%\KMPlayer 64X\KMPlayer64.exe" "%UserProfile%\Desktop\Apple.mp3"
if not errorlevel 1 set "MusicPlay=1"
goto WaitTime

:NoFirefox
if not defined MusicPlay goto WaitTime
%SystemRoot%\System32\taskill.exe /IM KMPlayer64.exe >nul 2>nul
set "MusicPlay="

:WaitTime
cls
%SystemRoot%\System32\choice.exe /C NY /N /T 5 /D N /M "Stop watching Firefox [N/y]?"
if not errorlevel 2 goto Loop
if defined MusicPlay %SystemRoot%\System32\taskill.exe /IM KMPlayer64.exe >nul 2>nul

endlocal

There could used for the command block below label WaitTime also just:

%SystemRoot%\System32\timeout.exe /T 5 /NOBREAK >nul
goto Loop

That results in a timeout of five seconds without a user prompt to stop watching Firefox with waiting only up to five seconds for the user input before running the check on running Firefox once again.

A wait time with CHOICE or TIMEOUT (or PING) is necessary to pause batch script execution for some time like five seconds as otherwise the Windows command processor cmd.exe would execute the commands in the batch file again and again as fast as possible which means cmd would use one core of the CPU at 100% and would make really lots of file system accesses because of starting the executable TASKLIST again and again without any longer pause between the executions. That would not be good for the entire computer performance on which the music player runs and Firefox wants also CPU performance and access to the file system.

It would be better to replace the shortcut to start Firefox by a shortcut which starts cmd.exe with the command line to start the music player as separate process, run Firefox and wait for its self-termination and then terminate the music player. That would be more efficient.

For understanding the used commands and how they work, open a command prompt window, execute there the following commands, and read entirely all help pages displayed for each command very carefully.

• cls /?
• choice /?
• echo /?
• endlocal /?
• find /?
• goto /?
• if /?
• set /?
• setlocal /?
• start /?
• taskkill /?
• tasklist /?
• timeout /?
• title /?

See also:

• Microsoft documentation about Using command redirection operators for an explanation of >nul, 2>nul and |.
• Single line with multiple commands using Windows batch file for an explanation of conditional operator ||.