-flatbed does not work in installed version

[jab11]

my scanner is Brother MFC-L2730DW series
I'm running scanline -batch -flatbed docs but I'm getting an error:

Searching for available scanners
Waiting up to 10.0 seconds to find scanners
Found scanner: Brother MFC-L2730DW series
Opening session with scanner
didOpenSessionWithError: [no error]
deviceDidBecomeReady
didSelectFunctionalUnit:  error: [no error]
Configuring scanner
Configuring Flatbed
Starting scan...
didEncounterError: An error occurred during scanning.
Failed to scan document.
Done

scanning from the document feeder works fine.

I downloaded the xcode project and ran the same command and that seems to work fine with -flatbed, is there a difference from the installed version ?

[jab11]

more info:
running the project from xcode works with -flatbed
exporting the project and running from commandline fails when using -flatbed, but works without it

[KaarlisCaune]

I'm using Epson V370 (no document feeder), and experiencing the same issue.

• Running in xcode with -flatbed works
• Running exported build with -flatbed errors with didEncounterError: An error occurred during scanning. Failed to scan document.

[klep]

@KaarlisCaune , when you say "exported build", do you mean a build that you made in XCode? Or the pre-built binary in git?

[klep]

Quick update -- I was able to repro this issue using the .dmg image linked in the README. Not sure yet if that binary is from a bad build or if it's something else. In the interim, please make a build from Xcode and grab the generated binary instead of using what's linked from the README

[klep]

Looks like this is a difference between what happens when checking non-optionals for nil in Debug vs. Release builds. The didSelect functionalUnit delegate method can give you a non-optional that's nil (which is a API bug) but in Release, checking it against nil will always return false (an optimization I suppose since it never should be nil). I've got a fix coming that instead checks its address against 0x0.

[klep]

@jab11 @KaarlisCaune Please give this a try: https://github.com/klep/scanline/blob/master/scanline-1.0.1.pkg?raw=true