[sane-devel] why my backend can not be loaded by dll ?

[zhu]

Dear sane-devel friends,

     I wrote a backend called "m1200up" for a mustek 1200usb plus scanner,but dll can not load my backend,who can help me,the detial is followed:

     1.make uninstall
     2.copied my source code to sane-backends-1.0.8/backend/
     3.edited the backend/Makefile.in
     4.edited the backend/dll.conf
     5.execute the sane-backends-1.0.8/configure
     6.make (no error)
     7.make install (no error)
  
     8.scanimage -L ,it telled me "No Scanner..."
     9.SANE_DEBUG_DLL=128 scanimage -L , the useful debug informations are followed:

          [dll]add_backend: adding backend 'm1200up'
          [dll]load: searching backend 'm1200up' in '/usr/local/lib/sane'
          [dll]load: trying to load '/usr/local/lib/sane/libsane-m1200up.so.1'
          [dll]load: dlopen()ing '/usr/local/lib/sane/libsane-m1200up.so.1'
          [dll]load: unable to find _sane_m1200up_init
          [dll]load: unable to find _sane_m1200up_exit
           ......
          [dll]load: unable to find _sane_m1200up_get_select_fd
          [dll]init: initializing backend 'm1200up'

     I wrote some code trying to open a file and write some test information at the start of sane_init function,the result made me know the sane_init function did not be called.

     I'v already implemented the sane api(sane_init,sane_exit etc.) in the m1200up.c. Why dll can not find these function?
     Thank you!

Sincerely
Jason 
2002-7-23

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