ruby - Error in irb free() invalid size error when calling library from FFI -

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description

i trying call omnipage ocr library ruby using ffi on linux. in particular, there recprocesspagesex method following signature:

recerr recapipls recprocesspagesex  (     int           sid,     lpctstr       pdocfile,     lpctstr *     pimagefiles,     lponetouch_cb pcallback,     void *        pcontext  )

i've defined methods in ruby (note :rec_err enum type definition defined elsewhere):

module omnipage   extend ffi::library    nuance_directory = '/usr/local/lib/nuance-omnipage-csdk-lib64-19.2/'.freeze    lib_paths = %w(librecapiplus.so libkernelapi.so libtxtconv.so librtfconv.so).map |file|     file.join(nuance_directory, file)   end    ffi_lib lib_paths    attach_function :init, :recinitplusa, [:pointer, :pointer], :rec_err   attach_function :set_license, :krecsetlicensea, [:pointer, :pointer], :rec_err   attach_function :set_output_format, :recsetoutputformata, [:int, :pointer], :rec_err   attach_function :set_output_level, :recsetoutputlevel, [:int, :output_level], :rec_err    attach_function :recprocesspagesexa, [:int, :string, :pointer, :pointer, :pointer], :rec_err    def self.process_pages(id, output_file, *images)     ffi::memorypointer.new(:pointer, images.length + 1) |p_images_array|       p_images = images.map(&ffi::memorypointer.method(:from_string)) << nil       p_images_array.write_array_of_pointer p_images       return recprocesspagesexa(id, output_file, p_images_array, nil, nil)     end   end end

the various calls set license , initialize license works fine...however when call omnipage.process_pages method i've written, looks it's calling it, when returns irb blows following:

*** error in `irb': free(): invalid size: 0x00007f65fcefc360 *** aborted  shell returned 134

at point, i'm unsure how proceed. i've tried recprocessspagesexu8 variant of method call see if might case, no avail. is 64-bit library, though ffi seems aware it's 64-bit process didn't think issue.

any appreciated.

update #1

so here's odd thing...i wrote omnipage.cpp wrapper eliminate me being dumb ffi. here looked like:

#include <recapiplus.h>  extern "c" {   int processpages() {     const char* pimagefiles[2] = {"<path file>", null};     return recprocesspagesex(0, "<output file>", pimagefiles, null, null);   } }

i compiled with:

gcc -shared -o omnipage.so -fpic omnipage.cpp -l $ocrlibpath -lrecapiplus -lkernelapi -lrecpdf -wl,-rpath-link,$ocrlibpath,-rpath,$ocrlibpath

and updated ffi definition this:

module omnipage   extend ffi::library    ffi_lib 'omnipage.so'    attach_function :process_pages, :processpages, [], :int end

this yields exact same error:

*** error in `irb': free(): invalid size: 0x00007fb858a99360 *** aborted  shell returned 134

so doesn't seem have @ passing in memory pointers via ffi. has else seen before?


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