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pngout with exit code

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• roytam1 at 2008-11-13 17:37
  Hi Ken,
  
  I'm using PNGOUT for months in my png optimization batch, and I want pngout can output other exit code(e.g.: 1) if file is not optimized successfully, letting exit code 0 for file is optimized successfully. So that I can control optimization flow more completely.
  Thanks.
  
  Best regards,
  Roy
• counting_pine at 2008-11-18 09:52

  Re: pngout with exit code

  If it's any help, Windows NT and later have a console that supports (relatively) advanced batch scripting features, such as CALLing labels and IF comparisons, and it's possible to test the file size from within a batch file to see whether it's changed.
  Here's a reasonsbly simple example:
  

  @echo off
  pngout /y %1 temp.png
  
  call :checksize %1 temp.png
  goto :eof
  
  
  :checksize
  if %~z2 lss %~z1 (
  echo File was shrunk from %~z1 bytes to %~z2 bytes :^)
  ) else (
  echo File was not shrunk :(
  )
  
  goto :eof

• Awesoken at 2008-11-18 14:26
  Thanks for posting a solution, Counting Pine. I wanted to add that PNGOUT does return a 1 in some instances, but only for errors like "file not found".
• roytam1 at 2008-11-19 01:29

  If it's any help, Windows NT and later have a console that supports (relatively) advanced batch scripting features, such as CALLing labels and IF comparisons, and it's possible to test the file size from within a batch file to see whether it's changed.
  Here's a reasonsbly simple example:
  

  @echo off
  pngout /y %1 temp.png
  
  call :checksize %1 temp.png
  goto :eof
  
  
  :checksize
  if %~z2 lss %~z1 (
  echo File was shrunk from %~z1 bytes to %~z2 bytes :^)
  ) else (
  echo File was not shrunk :(
  )
  
  goto :eof

  but I'm using pngout on my win98 box.  :-\
• counting_pine at 2008-11-20 02:07

  but I'm using pngout on my win98 box.

  Bummer...
  OK, you might like this method better:
  

  @echo off
  pngout /y %1 temp.png | %windir%\command\find.exe "Chg:"
  if not errorlevel 1 echo file was shrunk

  
  I qualified the file path for find.exe, because I already have another program called find.exe in my %PATH%.
• roytam1 at 2008-11-21 13:34

  but I'm using pngout on my win98 box.

  Bummer...
  OK, you might like this method better:
  

  @echo off
  pngout /y %1 temp.png | %windir%\command\find.exe "Chg:"
  if not errorlevel 1 echo file was shrunk

  
  I qualified the file path for find.exe, because I already have another program called find.exe in my %PATH%.

  using pipe will remove interactive progress and make it "look like" freeze/hang.
  I want interactive progress.
  
  

  Thanks for posting a solution, Counting Pine. I wanted to add that PNGOUT does return a 1 in some instances, but only for errors like "file not found".

  maybe 1 for not optimized, 2 for find not found, etc.
• Awesoken at 2008-11-21 13:57
  I have updated PNGOUT.EXE with your request. It now returns:
  0: if the file compressed further
  1: if there was an error like 'file not found'
  2: if the file was unable to compress further
• roytam1 at 2008-11-21 17:14

  I have updated PNGOUT.EXE with your request. It now returns:
  0: if the file compressed further
  1: if there was an error like 'file not found'
  2: if the file was unable to compress further

  Thank you! It works like a charm!
• ace_dent at 2009-09-22 21:54
  Hi Ken
  
  Would it be possible to add another return code to indicate if a bitdepth and/or color reduction was not successful?
  3 - Could not reduce color or bit depth.
  
  This would be a massive benefit as I'm trying to make my 'pngslim' script smarter. It seems cleaner than writing temporary files or piping pngout into Find and doing text searches.
  
  Cheers
  Andrew
• Awesoken at 2009-09-23 01:13
  Fixed. Please see the PNGOUT changelog thread.
• ace_dent at 2009-09-23 08:34
  Fantastic!! This will be a great help.
  
  Many thanks
  Andrew
• JonoF at 2009-11-08 14:03
  I've also (finally) updated the Linux, BSD, and OSX versions.
  
  Jonathon