Could not find library [libjsane.so] about vietocr3

[nguyenq]

The doc states: "On Linux, scanning requires installation of SANE packages." Have you installed it?

[nguyenq]

It was recently discovered that the jsane library, the java wrapper to the SANE functions, only works with Linux 32-bit. Running it on Linux 64-bit will throw UnsatisfiedLinkError exceptions. It looks like a libjsane.so has to be compiled for 64-bit.

Background: http://imagej.1557.x6.nabble.com/Scan-does-not-scan-td3685074.html
Source: http://thorntonzone.com/manuals/Compression/Fax,%20IBM%20MMR/MMSC/mmsc/uk/co/mmscomputing/device/sane/index.html

[nguyenq]

We can recompile the library on Linux Ubuntu 64-bit, but it looks like some change to the source code is necessary as UnsatisfiedLinkError exceptions still happen. Need JNI expert help!

[ekuester]

In my opinion you should leave out the scan option in the GUI. The uk.co.mmscomputing.device.sane.jar is too old for modern java ...
Nevertheless I gave it a try:
As outlined you need lin64 code. I fetched it from
ttps://github.com/julian554/jscan/tree/master/src/main/java/uk/co/mmscomputing/device/sane/lin64,
corrected the location of some include files and replaced libsane.so in jsane.cpp by libsane.so.1. Now build lib with
g++ -Wall -fPIC -fpermissive -pthread -D_REENTRANT -D_GNU_SOURCE -shared -o libjsane.so jsane.cpp jdesc.cpp jnu.cpp and get 64-bit libjsane.so . I copied this into /usr/lib so that it can be found by the program. Starting the JAR the above error messages are gone BUT I get a fatal error detected by the Java Runtime Environment ( SIGSEGV fault ). Here I gave up.