dll2lib: make lib file from dll using msvc's dumpbin and lib (requires ruby)

dll2lib.bat

@ruby -x "%~f0" %*
@exit /b
#!ruby

def dumpbin(filename)
  `dumpbin /exports #{filename}`
end

def extract_function_names(exports)
  exports[/^\s+ordinal.*^\s+Summary/m].scan(/\s+[A-Z\d+]{8}\s+(\w+)$/)
end

def write_def(names, defname)
  open(defname, 'w') do |f|
    f.puts "EXPORTS"
    names.each do |name|
      f.puts "  #{name}"
    end
  end
end

def lib(defname, libname)
  system "lib /nologo /machine:x86 /subsystem:native /def:#{defname} /out:#{libname}"
end

def main
  ARGV.each do |filename|
    ext = File.extname filename
    defname = filename.sub(ext, '.def')
    libname = filename.sub(ext, '.lib')
    
    exports = dumpbin(filename)
    names = extract_function_names(exports)
    
    write_def(names, defname)
    
    lib(defname, libname)
  end
end

main if $0 == __FILE__

dll2lib.rb

@def dumpbin(filename)
  `dumpbin /exports #{filename}`
end

def extract_function_names(exports)
  exports[/^\s+ordinal.*^\s+Summary/m].scan(/\s+[A-Z\d+]{8}\s+(\w+)$/)
end

def write_def(names, defname)
  open(defname, 'w') do |f|
    f.puts "EXPORTS"
    names.each do |name|
      f.puts "  #{name}"
    end
  end
end

def lib(defname, libname)
  system "lib /nologo /machine:x86 /subsystem:native /def:#{defname} /out:#{libname}"
end

def main
  ARGV.each do |filename|
    ext = File.extname filename
    defname = filename.sub(ext, '.def')
    libname = filename.sub(ext, '.lib')
    
    exports = dumpbin(filename)
    names = extract_function_names(exports)
    
    write_def(names, defname)
    
    lib(defname, libname)
  end
end

main if $0 == __FILE__