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Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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Hunting for Beyond Compare on your system: bc.bat

Posted by jpluimers on 2018/10/23

For my archive bc.bat it finds Beyond Compare, then starts it with the given command line parameters. It prefers version 4 over version 3 and user settings over system settings:

:begin
@echo off
  setlocal
  IF /I %PROCESSOR_ARCHITECTURE% == amd64 goto :x64
  IF /I %PROCESSOR_ARCHITEW6432% == amd64 goto :x64
  goto :x86
:x64
  :: OS is 64bit
  set hkcuBaseKey=HKEY_CURRENT_USER\Software\Scooter Software\Beyond Compare
  set hklmBaseKey=HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Scooter Software\Beyond Compare
  
  goto :findBC
:x86
  :: OS is 32bit
  set hkcuBaseKey=HKEY_CURRENT_USER\Software\Scooter Software\Beyond Compare
  set hklmBaseKey=HKEY_LOCAL_MACHINE\SOFTWARE\Scooter Software\Beyond Compare
  goto :findBC
:findBC
  :: https://gist.github.com/rojepp/634908
  :: http://stackoverflow.com/questions/5369528/windows-batch-reg-query-key-value-to-a-variable-but-do-not-display-error-if-key
  set SupportedBeyondCompareVersions=3, 4
  for %%v in (%SupportedBeyondCompareVersions%) do (
    for /f "usebackq tokens=2* delims= " %%c in (`reg query "%hkcuBaseKey% %%v" /v ExePath 2^>NUL`) do (
      call :do set bcExe="%%d"
    )
  )
  if not [%bcExe%]==[] goto :foundBC
    for /f "usebackq tokens=2* delims= " %%c in (`reg query "%hkcuBaseKey%" /v ExePath 2^>NUL`) do (
      call :do set bcExe="%%d"
    )
  if not [%bcExe%]==[] goto :foundBC
  for %%v in (%SupportedBeyondCompareVersions%) do (
    for /f "usebackq tokens=2* delims= " %%c in (`reg query "%hklmBaseKey% %%v" /v ExePath 2^>NUL`) do (
      call :do set bcExe="%%d"
    )
  )
  if not [%bcExe%]==[] goto :foundBC
    for /f "usebackq tokens=2* delims= " %%c in (`reg query "%hklmBaseKey%" /v ExePath 2^>NUL`) do (
      call :do set bcExe="%%d"
    )
:foundBC
  if [%bcExe%]==[] ( echo no bc.exe found in registry) else (
    echo bcExe=%bcExe%
    if exist %bcExe% start "Beyond Compare" %bcExe% %*
    if not exist %bcExe% echo not found: [%bcExe%]
  )
:exit
  endlocal
:end
  goto :eof
:do
  ::echo %*
  call %*
  goto :eof

–jeroen

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